From 87f7632fcd113939f5fc6029a1d902113b08373c Mon Sep 17 00:00:00 2001 From: Mark Huang Date: Mon, 7 Jun 2004 19:53:02 +0000 Subject: [PATCH] Initial revision --- arch/um/drivers/cow.h | 41 ++ arch/um/drivers/cow_kern.c | 630 +++++++++++++++++++ arch/um/drivers/cow_user.c | 375 ++++++++++++ arch/um/drivers/net_kern.c.orig | 870 ++++++++++++++++++++++++++ arch/um/include/irq_kern.h | 28 + arch/um/include/mem_kern.h | 30 + arch/um/kernel/physmem.c | 468 ++++++++++++++ arch/um/kernel/skas/uaccess.c | 219 +++++++ arch/um/kernel/smp.c.orig | 302 +++++++++ arch/um/kernel/tt/uaccess.c | 73 +++ arch/um/os-Linux/user_syms.c | 88 +++ arch/um/sys-i386/time.c | 24 + fs/Makefile.orig | 94 +++ fs/hostfs/Makefile | 26 + fs/hostfs/hostfs.h | 79 +++ fs/hostfs/hostfs_kern.c | 1008 +++++++++++++++++++++++++++++++ fs/hostfs/hostfs_user.c | 361 +++++++++++ fs/hppfs/Makefile | 19 + fs/hppfs/hppfs_kern.c | 811 +++++++++++++++++++++++++ include/asm-um/cpufeature.h | 6 + include/asm-um/local.h | 6 + include/asm-um/module-generic.h | 6 + include/asm-um/sections.h | 7 + include/linux/ghash.h | 236 ++++++++ include/linux/proc_mm.h | 48 ++ mm/proc_mm.c | 174 ++++++ 26 files changed, 6029 insertions(+) create mode 100644 arch/um/drivers/cow.h create mode 100644 arch/um/drivers/cow_kern.c create mode 100644 arch/um/drivers/cow_user.c create mode 100644 arch/um/drivers/net_kern.c.orig create mode 100644 arch/um/include/irq_kern.h create mode 100644 arch/um/include/mem_kern.h create mode 100644 arch/um/kernel/physmem.c create mode 100644 arch/um/kernel/skas/uaccess.c create mode 100644 arch/um/kernel/smp.c.orig create mode 100644 arch/um/kernel/tt/uaccess.c create mode 100644 arch/um/os-Linux/user_syms.c create mode 100644 arch/um/sys-i386/time.c create mode 100644 fs/Makefile.orig create mode 100644 fs/hostfs/Makefile create mode 100644 fs/hostfs/hostfs.h create mode 100644 fs/hostfs/hostfs_kern.c create mode 100644 fs/hostfs/hostfs_user.c create mode 100644 fs/hppfs/Makefile create mode 100644 fs/hppfs/hppfs_kern.c create mode 100644 include/asm-um/cpufeature.h create mode 100644 include/asm-um/local.h create mode 100644 include/asm-um/module-generic.h create mode 100644 include/asm-um/sections.h create mode 100644 include/linux/ghash.h create mode 100644 include/linux/proc_mm.h create mode 100644 mm/proc_mm.c diff --git a/arch/um/drivers/cow.h b/arch/um/drivers/cow.h new file mode 100644 index 000000000..d875d0435 --- /dev/null +++ b/arch/um/drivers/cow.h @@ -0,0 +1,41 @@ +#ifndef __COW_H__ +#define __COW_H__ + +#include + +#if __BYTE_ORDER == __BIG_ENDIAN +# define ntohll(x) (x) +# define htonll(x) (x) +#elif __BYTE_ORDER == __LITTLE_ENDIAN +# define ntohll(x) bswap_64(x) +# define htonll(x) bswap_64(x) +#else +#error "__BYTE_ORDER not defined" +#endif + +extern int init_cow_file(int fd, char *cow_file, char *backing_file, + int sectorsize, int alignment, int *bitmap_offset_out, + unsigned long *bitmap_len_out, int *data_offset_out); + +extern int file_reader(__u64 offset, char *buf, int len, void *arg); +extern int read_cow_header(int (*reader)(__u64, char *, int, void *), + void *arg, __u32 *version_out, + char **backing_file_out, time_t *mtime_out, + __u64 *size_out, int *sectorsize_out, + __u32 *align_out, int *bitmap_offset_out); + +extern int write_cow_header(char *cow_file, int fd, char *backing_file, + int sectorsize, int alignment, long long *size); + +extern void cow_sizes(int version, __u64 size, int sectorsize, int align, + int bitmap_offset, unsigned long *bitmap_len_out, + int *data_offset_out); + +#endif + +/* + * --------------------------------------------------------------------------- + * Local variables: + * c-file-style: "linux" + * End: + */ diff --git a/arch/um/drivers/cow_kern.c b/arch/um/drivers/cow_kern.c new file mode 100644 index 000000000..ad843f3b6 --- /dev/null +++ b/arch/um/drivers/cow_kern.c @@ -0,0 +1,630 @@ +#define COW_MAJOR 60 +#define MAJOR_NR COW_MAJOR + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include "2_5compat.h" +#include "cow.h" +#include "ubd_user.h" + +#define COW_SHIFT 4 + +struct cow { + int count; + char *cow_path; + dev_t cow_dev; + struct block_device *cow_bdev; + char *backing_path; + dev_t backing_dev; + struct block_device *backing_bdev; + int sectorsize; + unsigned long *bitmap; + unsigned long bitmap_len; + int bitmap_offset; + int data_offset; + devfs_handle_t devfs; + struct semaphore sem; + struct semaphore io_sem; + atomic_t working; + spinlock_t io_lock; + struct buffer_head *bh; + struct buffer_head *bhtail; + void *end_io; +}; + +#define DEFAULT_COW { \ + .count = 0, \ + .cow_path = NULL, \ + .cow_dev = 0, \ + .backing_path = NULL, \ + .backing_dev = 0, \ + .bitmap = NULL, \ + .bitmap_len = 0, \ + .bitmap_offset = 0, \ + .data_offset = 0, \ + .devfs = NULL, \ + .working = ATOMIC_INIT(0), \ + .io_lock = SPIN_LOCK_UNLOCKED, \ +} + +#define MAX_DEV (8) +#define MAX_MINOR (MAX_DEV << COW_SHIFT) + +struct cow cow_dev[MAX_DEV] = { [ 0 ... MAX_DEV - 1 ] = DEFAULT_COW }; + +/* Not modified by this driver */ +static int blk_sizes[MAX_MINOR] = { [ 0 ... MAX_MINOR - 1 ] = BLOCK_SIZE }; +static int hardsect_sizes[MAX_MINOR] = { [ 0 ... MAX_MINOR - 1 ] = 512 }; + +/* Protected by cow_lock */ +static int sizes[MAX_MINOR] = { [ 0 ... MAX_MINOR - 1 ] = 0 }; + +static struct hd_struct cow_part[MAX_MINOR] = + { [ 0 ... MAX_MINOR - 1 ] = { 0, 0, 0 } }; + +/* Protected by io_request_lock */ +static request_queue_t *cow_queue; + +static int cow_open(struct inode *inode, struct file *filp); +static int cow_release(struct inode * inode, struct file * file); +static int cow_ioctl(struct inode * inode, struct file * file, + unsigned int cmd, unsigned long arg); +static int cow_revalidate(kdev_t rdev); + +static struct block_device_operations cow_blops = { + .open = cow_open, + .release = cow_release, + .ioctl = cow_ioctl, + .revalidate = cow_revalidate, +}; + +/* Initialized in an initcall, and unchanged thereafter */ +devfs_handle_t cow_dir_handle; + +#define INIT_GENDISK(maj, name, parts, shift, bsizes, max, blops) \ +{ \ + .major = maj, \ + .major_name = name, \ + .minor_shift = shift, \ + .max_p = 1 << shift, \ + .part = parts, \ + .sizes = bsizes, \ + .nr_real = max, \ + .real_devices = NULL, \ + .next = NULL, \ + .fops = blops, \ + .de_arr = NULL, \ + .flags = 0 \ +} + +static spinlock_t cow_lock = SPIN_LOCK_UNLOCKED; + +static struct gendisk cow_gendisk = INIT_GENDISK(MAJOR_NR, "cow", cow_part, + COW_SHIFT, sizes, MAX_DEV, + &cow_blops); + +static int cow_add(int n) +{ + struct cow *dev = &cow_dev[n]; + char name[sizeof("nnnnnn\0")]; + int err = -ENODEV; + + if(dev->cow_path == NULL) + goto out; + + sprintf(name, "%d", n); + dev->devfs = devfs_register(cow_dir_handle, name, DEVFS_FL_REMOVABLE, + MAJOR_NR, n << COW_SHIFT, S_IFBLK | + S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP, + &cow_blops, NULL); + + init_MUTEX_LOCKED(&dev->sem); + init_MUTEX(&dev->io_sem); + + return(0); + + out: + return(err); +} + +/* + * Add buffer_head to back of pending list + */ +static void cow_add_bh(struct cow *cow, struct buffer_head *bh) +{ + unsigned long flags; + + spin_lock_irqsave(&cow->io_lock, flags); + if(cow->bhtail != NULL){ + cow->bhtail->b_reqnext = bh; + cow->bhtail = bh; + } + else { + cow->bh = bh; + cow->bhtail = bh; + } + spin_unlock_irqrestore(&cow->io_lock, flags); +} + +/* +* Grab first pending buffer +*/ +static struct buffer_head *cow_get_bh(struct cow *cow) +{ + struct buffer_head *bh; + + spin_lock_irq(&cow->io_lock); + bh = cow->bh; + if(bh != NULL){ + if(bh == cow->bhtail) + cow->bhtail = NULL; + cow->bh = bh->b_reqnext; + bh->b_reqnext = NULL; + } + spin_unlock_irq(&cow->io_lock); + + return(bh); +} + +static void cow_handle_bh(struct cow *cow, struct buffer_head *bh, + struct buffer_head **cow_bh, int ncow_bh) +{ + int i; + + if(ncow_bh > 0) + ll_rw_block(WRITE, ncow_bh, cow_bh); + + for(i = 0; i < ncow_bh ; i++){ + wait_on_buffer(cow_bh[i]); + brelse(cow_bh[i]); + } + + ll_rw_block(WRITE, 1, &bh); + brelse(bh); +} + +static struct buffer_head *cow_new_bh(struct cow *dev, int sector) +{ + struct buffer_head *bh; + + sector = (dev->bitmap_offset + sector / 8) / dev->sectorsize; + bh = getblk(dev->cow_dev, sector, dev->sectorsize); + memcpy(bh->b_data, dev->bitmap + sector / (8 * sizeof(dev->bitmap[0])), + dev->sectorsize); + return(bh); +} + +/* Copied from loop.c, needed to avoid deadlocking in make_request. */ + +static int cow_thread(void *data) +{ + struct cow *dev = data; + struct buffer_head *bh; + + daemonize(); + exit_files(current); + + sprintf(current->comm, "cow%d", dev - cow_dev); + + spin_lock_irq(¤t->sigmask_lock); + sigfillset(¤t->blocked); + flush_signals(current); + spin_unlock_irq(¤t->sigmask_lock); + + atomic_inc(&dev->working); + + current->policy = SCHED_OTHER; + current->nice = -20; + + current->flags |= PF_NOIO; + + /* + * up sem, we are running + */ + up(&dev->sem); + + for(;;){ + int start, len, nbh, i, update_bitmap = 0; + struct buffer_head *cow_bh[2]; + + down_interruptible(&dev->io_sem); + /* + * could be upped because of tear-down, not because of + * pending work + */ + if(!atomic_read(&dev->working)) + break; + + bh = cow_get_bh(dev); + if(bh == NULL){ + printk(KERN_ERR "cow: missing bh\n"); + continue; + } + + start = bh->b_blocknr * bh->b_size / dev->sectorsize; + len = bh->b_size / dev->sectorsize; + for(i = 0; i < len ; i++){ + if(ubd_test_bit(start + i, + (unsigned char *) dev->bitmap)) + continue; + + update_bitmap = 1; + ubd_set_bit(start + i, (unsigned char *) dev->bitmap); + } + + cow_bh[0] = NULL; + cow_bh[1] = NULL; + nbh = 0; + if(update_bitmap){ + cow_bh[0] = cow_new_bh(dev, start); + nbh++; + if(start / dev->sectorsize != + (start + len) / dev->sectorsize){ + cow_bh[1] = cow_new_bh(dev, start + len); + nbh++; + } + } + + bh->b_dev = dev->cow_dev; + bh->b_blocknr += dev->data_offset / dev->sectorsize; + + cow_handle_bh(dev, bh, cow_bh, nbh); + + /* + * upped both for pending work and tear-down, lo_pending + * will hit zero then + */ + if(atomic_dec_and_test(&dev->working)) + break; + } + + up(&dev->sem); + return(0); +} + +static int cow_make_request(request_queue_t *q, int rw, struct buffer_head *bh) +{ + struct cow *dev; + int n, minor; + + minor = MINOR(bh->b_rdev); + n = minor >> COW_SHIFT; + dev = &cow_dev[n]; + + dev->end_io = NULL; + if(ubd_test_bit(bh->b_rsector, (unsigned char *) dev->bitmap)){ + bh->b_rdev = dev->cow_dev; + bh->b_rsector += dev->data_offset / dev->sectorsize; + } + else if(rw == WRITE){ + bh->b_dev = dev->cow_dev; + bh->b_blocknr += dev->data_offset / dev->sectorsize; + + cow_add_bh(dev, bh); + up(&dev->io_sem); + return(0); + } + else { + bh->b_rdev = dev->backing_dev; + } + + return(1); +} + +int cow_init(void) +{ + int i; + + cow_dir_handle = devfs_mk_dir (NULL, "cow", NULL); + if (devfs_register_blkdev(MAJOR_NR, "cow", &cow_blops)) { + printk(KERN_ERR "cow: unable to get major %d\n", MAJOR_NR); + return -1; + } + read_ahead[MAJOR_NR] = 8; /* 8 sector (4kB) read-ahead */ + blksize_size[MAJOR_NR] = blk_sizes; + blk_size[MAJOR_NR] = sizes; + INIT_HARDSECT(hardsect_size, MAJOR_NR, hardsect_sizes); + + cow_queue = BLK_DEFAULT_QUEUE(MAJOR_NR); + blk_init_queue(cow_queue, NULL); + INIT_ELV(cow_queue, &cow_queue->elevator); + blk_queue_make_request(cow_queue, cow_make_request); + + add_gendisk(&cow_gendisk); + + for(i=0;i 0){ + n = (left > blocksize) ? blocksize : left; + + bh = bread(dev, block, (n < 512) ? 512 : n); + if(bh == NULL) + return(-EIO); + + n -= offset; + memcpy(&buf[cur], bh->b_data + offset, n); + block++; + left -= n; + cur += n; + offset = 0; + brelse(bh); + } + + return(count); +} + +static int cow_open(struct inode *inode, struct file *filp) +{ + int (*dev_ioctl)(struct inode *, struct file *, unsigned int, + unsigned long); + mm_segment_t fs; + struct cow *dev; + __u64 size; + __u32 version, align; + time_t mtime; + char *backing_file; + int n, offset, err = 0; + + n = DEVICE_NR(inode->i_rdev); + if(n >= MAX_DEV) + return(-ENODEV); + dev = &cow_dev[n]; + offset = n << COW_SHIFT; + + spin_lock(&cow_lock); + + if(dev->count == 0){ + dev->cow_dev = name_to_kdev_t(dev->cow_path); + if(dev->cow_dev == 0){ + printk(KERN_ERR "cow_open - name_to_kdev_t(\"%s\") " + "failed\n", dev->cow_path); + err = -ENODEV; + } + + dev->backing_dev = name_to_kdev_t(dev->backing_path); + if(dev->backing_dev == 0){ + printk(KERN_ERR "cow_open - name_to_kdev_t(\"%s\") " + "failed\n", dev->backing_path); + err = -ENODEV; + } + + if(err) + goto out; + + dev->cow_bdev = bdget(dev->cow_dev); + if(dev->cow_bdev == NULL){ + printk(KERN_ERR "cow_open - bdget(\"%s\") failed\n", + dev->cow_path); + err = -ENOMEM; + } + dev->backing_bdev = bdget(dev->backing_dev); + if(dev->backing_bdev == NULL){ + printk(KERN_ERR "cow_open - bdget(\"%s\") failed\n", + dev->backing_path); + err = -ENOMEM; + } + + if(err) + goto out; + + err = blkdev_get(dev->cow_bdev, FMODE_READ|FMODE_WRITE, 0, + BDEV_RAW); + if(err){ + printk("cow_open - blkdev_get of COW device failed, " + "error = %d\n", err); + goto out; + } + + err = blkdev_get(dev->backing_bdev, FMODE_READ, 0, BDEV_RAW); + if(err){ + printk("cow_open - blkdev_get of backing device " + "failed, error = %d\n", err); + goto out; + } + + err = read_cow_header(reader, &dev->cow_dev, &version, + &backing_file, &mtime, &size, + &dev->sectorsize, &align, + &dev->bitmap_offset); + if(err){ + printk(KERN_ERR "cow_open - read_cow_header failed, " + "err = %d\n", err); + goto out; + } + + cow_sizes(version, size, dev->sectorsize, align, + dev->bitmap_offset, &dev->bitmap_len, + &dev->data_offset); + dev->bitmap = (void *) vmalloc(dev->bitmap_len); + if(dev->bitmap == NULL){ + err = -ENOMEM; + printk(KERN_ERR "Failed to vmalloc COW bitmap\n"); + goto out; + } + flush_tlb_kernel_vm(); + + err = reader(dev->bitmap_offset, (char *) dev->bitmap, + dev->bitmap_len, &dev->cow_dev); + if(err < 0){ + printk(KERN_ERR "Failed to read COW bitmap\n"); + vfree(dev->bitmap); + goto out; + } + + dev_ioctl = dev->backing_bdev->bd_op->ioctl; + fs = get_fs(); + set_fs(KERNEL_DS); + err = (*dev_ioctl)(inode, filp, BLKGETSIZE, + (unsigned long) &sizes[offset]); + set_fs(fs); + if(err){ + printk(KERN_ERR "cow_open - BLKGETSIZE failed, " + "error = %d\n", err); + goto out; + } + + kernel_thread(cow_thread, dev, + CLONE_FS | CLONE_FILES | CLONE_SIGHAND); + down(&dev->sem); + } + dev->count++; + out: + spin_unlock(&cow_lock); + return(err); +} + +static int cow_release(struct inode * inode, struct file * file) +{ + struct cow *dev; + int n, err; + + n = DEVICE_NR(inode->i_rdev); + if(n >= MAX_DEV) + return(-ENODEV); + dev = &cow_dev[n]; + + spin_lock(&cow_lock); + + if(--dev->count > 0) + goto out; + + err = blkdev_put(dev->cow_bdev, BDEV_RAW); + if(err) + printk("cow_release - blkdev_put of cow device failed, " + "error = %d\n", err); + bdput(dev->cow_bdev); + dev->cow_bdev = 0; + + err = blkdev_put(dev->backing_bdev, BDEV_RAW); + if(err) + printk("cow_release - blkdev_put of backing device failed, " + "error = %d\n", err); + bdput(dev->backing_bdev); + dev->backing_bdev = 0; + + out: + spin_unlock(&cow_lock); + return(0); +} + +static int cow_ioctl(struct inode * inode, struct file * file, + unsigned int cmd, unsigned long arg) +{ + struct cow *dev; + int (*dev_ioctl)(struct inode *, struct file *, unsigned int, + unsigned long); + int n; + + n = DEVICE_NR(inode->i_rdev); + if(n >= MAX_DEV) + return(-ENODEV); + dev = &cow_dev[n]; + + dev_ioctl = dev->backing_bdev->bd_op->ioctl; + return((*dev_ioctl)(inode, file, cmd, arg)); +} + +static int cow_revalidate(kdev_t rdev) +{ + printk(KERN_ERR "Need to implement cow_revalidate\n"); + return(0); +} + +static int parse_unit(char **ptr) +{ + char *str = *ptr, *end; + int n = -1; + + if(isdigit(*str)) { + n = simple_strtoul(str, &end, 0); + if(end == str) + return(-1); + *ptr = end; + } + else if (('a' <= *str) && (*str <= 'h')) { + n = *str - 'a'; + str++; + *ptr = str; + } + return(n); +} + +static int cow_setup(char *str) +{ + struct cow *dev; + char *cow_name, *backing_name; + int unit; + + unit = parse_unit(&str); + if(unit < 0){ + printk(KERN_ERR "cow_setup - Couldn't parse unit number\n"); + return(1); + } + + if(*str != '='){ + printk(KERN_ERR "cow_setup - Missing '=' after unit " + "number\n"); + return(1); + } + str++; + + cow_name = str; + backing_name = strchr(str, ','); + if(backing_name == NULL){ + printk(KERN_ERR "cow_setup - missing backing device name\n"); + return(0); + } + *backing_name = '\0'; + backing_name++; + + spin_lock(&cow_lock); + + dev = &cow_dev[unit]; + dev->cow_path = cow_name; + dev->backing_path = backing_name; + + spin_unlock(&cow_lock); + return(0); +} + +__setup("cow", cow_setup); + +/* + * Overrides for Emacs so that we follow Linus's tabbing style. + * Emacs will notice this stuff at the end of the file and automatically + * adjust the settings for this buffer only. This must remain at the end + * of the file. + * --------------------------------------------------------------------------- + * Local variables: + * c-file-style: "linux" + * End: + */ diff --git a/arch/um/drivers/cow_user.c b/arch/um/drivers/cow_user.c new file mode 100644 index 000000000..014c2c853 --- /dev/null +++ b/arch/um/drivers/cow_user.c @@ -0,0 +1,375 @@ +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "os.h" + +#include "cow.h" +#include "cow_sys.h" + +#define PATH_LEN_V1 256 + +struct cow_header_v1 { + int magic; + int version; + char backing_file[PATH_LEN_V1]; + time_t mtime; + __u64 size; + int sectorsize; +}; + +#define PATH_LEN_V2 MAXPATHLEN + +struct cow_header_v2 { + unsigned long magic; + unsigned long version; + char backing_file[PATH_LEN_V2]; + time_t mtime; + __u64 size; + int sectorsize; +}; + +/* Define PATH_LEN_V3 as the usual value of MAXPATHLEN, just hard-code it in + * case other systems have different values for MAXPATHLEN + */ +#define PATH_LEN_V3 4096 + +/* Changes from V2 - + * PATH_LEN_V3 as described above + * Explicitly specify field bit lengths for systems with different + * lengths for the usual C types. Not sure whether char or + * time_t should be changed, this can be changed later without + * breaking compatibility + * Add alignment field so that different alignments can be used for the + * bitmap and data + * Add cow_format field to allow for the possibility of different ways + * of specifying the COW blocks. For now, the only value is 0, + * for the traditional COW bitmap. + * Move the backing_file field to the end of the header. This allows + * for the possibility of expanding it into the padding required + * by the bitmap alignment. + * The bitmap and data portions of the file will be aligned as specified + * by the alignment field. This is to allow COW files to be + * put on devices with restrictions on access alignments, such as + * /dev/raw, with a 512 byte alignment restriction. This also + * allows the data to be more aligned more strictly than on + * sector boundaries. This is needed for ubd-mmap, which needs + * the data to be page aligned. + * Fixed (finally!) the rounding bug + */ + +struct cow_header_v3 { + __u32 magic; + __u32 version; + time_t mtime; + __u64 size; + __u32 sectorsize; + __u32 alignment; + __u32 cow_format; + char backing_file[PATH_LEN_V3]; +}; + +/* COW format definitions - for now, we have only the usual COW bitmap */ +#define COW_BITMAP 0 + +union cow_header { + struct cow_header_v1 v1; + struct cow_header_v2 v2; + struct cow_header_v3 v3; +}; + +#define COW_MAGIC 0x4f4f4f4d /* MOOO */ +#define COW_VERSION 3 + +#define DIV_ROUND(x, len) (((x) + (len) - 1) / (len)) +#define ROUND_UP(x, align) DIV_ROUND(x, align) * (align) + +void cow_sizes(int version, __u64 size, int sectorsize, int align, + int bitmap_offset, unsigned long *bitmap_len_out, + int *data_offset_out) +{ + if(version < 3){ + *bitmap_len_out = (size + sectorsize - 1) / (8 * sectorsize); + + *data_offset_out = bitmap_offset + *bitmap_len_out; + *data_offset_out = (*data_offset_out + sectorsize - 1) / + sectorsize; + *data_offset_out *= sectorsize; + } + else { + *bitmap_len_out = DIV_ROUND(size, sectorsize); + *bitmap_len_out = DIV_ROUND(*bitmap_len_out, 8); + + *data_offset_out = bitmap_offset + *bitmap_len_out; + *data_offset_out = ROUND_UP(*data_offset_out, align); + } +} + +static int absolutize(char *to, int size, char *from) +{ + char save_cwd[256], *slash; + int remaining; + + if(getcwd(save_cwd, sizeof(save_cwd)) == NULL) { + cow_printf("absolutize : unable to get cwd - errno = %d\n", + errno); + return(-1); + } + slash = strrchr(from, '/'); + if(slash != NULL){ + *slash = '\0'; + if(chdir(from)){ + *slash = '/'; + cow_printf("absolutize : Can't cd to '%s' - " + "errno = %d\n", from, errno); + return(-1); + } + *slash = '/'; + if(getcwd(to, size) == NULL){ + cow_printf("absolutize : unable to get cwd of '%s' - " + "errno = %d\n", from, errno); + return(-1); + } + remaining = size - strlen(to); + if(strlen(slash) + 1 > remaining){ + cow_printf("absolutize : unable to fit '%s' into %d " + "chars\n", from, size); + return(-1); + } + strcat(to, slash); + } + else { + if(strlen(save_cwd) + 1 + strlen(from) + 1 > size){ + cow_printf("absolutize : unable to fit '%s' into %d " + "chars\n", from, size); + return(-1); + } + strcpy(to, save_cwd); + strcat(to, "/"); + strcat(to, from); + } + chdir(save_cwd); + return(0); +} + +int write_cow_header(char *cow_file, int fd, char *backing_file, + int sectorsize, int alignment, long long *size) +{ + struct cow_header_v3 *header; + unsigned long modtime; + int err; + + err = cow_seek_file(fd, 0); + if(err < 0){ + cow_printf("write_cow_header - lseek failed, err = %d\n", -err); + goto out; + } + + err = -ENOMEM; + header = cow_malloc(sizeof(*header)); + if(header == NULL){ + cow_printf("Failed to allocate COW V3 header\n"); + goto out; + } + header->magic = htonl(COW_MAGIC); + header->version = htonl(COW_VERSION); + + err = -EINVAL; + if(strlen(backing_file) > sizeof(header->backing_file) - 1){ + cow_printf("Backing file name \"%s\" is too long - names are " + "limited to %d characters\n", backing_file, + sizeof(header->backing_file) - 1); + goto out_free; + } + + if(absolutize(header->backing_file, sizeof(header->backing_file), + backing_file)) + goto out_free; + + err = os_file_modtime(header->backing_file, &modtime); + if(err < 0){ + cow_printf("Backing file '%s' mtime request failed, " + "err = %d\n", header->backing_file, -err); + goto out_free; + } + + err = cow_file_size(header->backing_file, size); + if(err < 0){ + cow_printf("Couldn't get size of backing file '%s', " + "err = %d\n", header->backing_file, -err); + goto out_free; + } + + header->mtime = htonl(modtime); + header->size = htonll(*size); + header->sectorsize = htonl(sectorsize); + header->alignment = htonl(alignment); + header->cow_format = COW_BITMAP; + + err = os_write_file(fd, header, sizeof(*header)); + if(err != sizeof(*header)){ + cow_printf("Write of header to new COW file '%s' failed, " + "err = %d\n", cow_file, -err); + goto out_free; + } + err = 0; + out_free: + cow_free(header); + out: + return(err); +} + +int file_reader(__u64 offset, char *buf, int len, void *arg) +{ + int fd = *((int *) arg); + + return(pread(fd, buf, len, offset)); +} + +/* XXX Need to sanity-check the values read from the header */ + +int read_cow_header(int (*reader)(__u64, char *, int, void *), void *arg, + __u32 *version_out, char **backing_file_out, + time_t *mtime_out, __u64 *size_out, + int *sectorsize_out, __u32 *align_out, + int *bitmap_offset_out) +{ + union cow_header *header; + char *file; + int err, n; + unsigned long version, magic; + + header = cow_malloc(sizeof(*header)); + if(header == NULL){ + cow_printf("read_cow_header - Failed to allocate header\n"); + return(-ENOMEM); + } + err = -EINVAL; + n = (*reader)(0, (char *) header, sizeof(*header), arg); + if(n < offsetof(typeof(header->v1), backing_file)){ + cow_printf("read_cow_header - short header\n"); + goto out; + } + + magic = header->v1.magic; + if(magic == COW_MAGIC) { + version = header->v1.version; + } + else if(magic == ntohl(COW_MAGIC)){ + version = ntohl(header->v1.version); + } + /* No error printed because the non-COW case comes through here */ + else goto out; + + *version_out = version; + + if(version == 1){ + if(n < sizeof(header->v1)){ + cow_printf("read_cow_header - failed to read V1 " + "header\n"); + goto out; + } + *mtime_out = header->v1.mtime; + *size_out = header->v1.size; + *sectorsize_out = header->v1.sectorsize; + *bitmap_offset_out = sizeof(header->v1); + *align_out = *sectorsize_out; + file = header->v1.backing_file; + } + else if(version == 2){ + if(n < sizeof(header->v2)){ + cow_printf("read_cow_header - failed to read V2 " + "header\n"); + goto out; + } + *mtime_out = ntohl(header->v2.mtime); + *size_out = ntohll(header->v2.size); + *sectorsize_out = ntohl(header->v2.sectorsize); + *bitmap_offset_out = sizeof(header->v2); + *align_out = *sectorsize_out; + file = header->v2.backing_file; + } + else if(version == 3){ + if(n < sizeof(header->v3)){ + cow_printf("read_cow_header - failed to read V2 " + "header\n"); + goto out; + } + *mtime_out = ntohl(header->v3.mtime); + *size_out = ntohll(header->v3.size); + *sectorsize_out = ntohl(header->v3.sectorsize); + *align_out = ntohl(header->v3.alignment); + *bitmap_offset_out = ROUND_UP(sizeof(header->v3), *align_out); + file = header->v3.backing_file; + } + else { + cow_printf("read_cow_header - invalid COW version\n"); + goto out; + } + err = -ENOMEM; + *backing_file_out = cow_strdup(file); + if(*backing_file_out == NULL){ + cow_printf("read_cow_header - failed to allocate backing " + "file\n"); + goto out; + } + err = 0; + out: + cow_free(header); + return(err); +} + +int init_cow_file(int fd, char *cow_file, char *backing_file, int sectorsize, + int alignment, int *bitmap_offset_out, + unsigned long *bitmap_len_out, int *data_offset_out) +{ + __u64 size, offset; + char zero = 0; + int err; + + err = write_cow_header(cow_file, fd, backing_file, sectorsize, + alignment, &size); + if(err) + goto out; + + *bitmap_offset_out = ROUND_UP(sizeof(struct cow_header_v3), alignment); + cow_sizes(COW_VERSION, size, sectorsize, alignment, *bitmap_offset_out, + bitmap_len_out, data_offset_out); + + offset = *data_offset_out + size - sizeof(zero); + err = cow_seek_file(fd, offset); + if(err < 0){ + cow_printf("cow bitmap lseek failed : err = %d\n", -err); + goto out; + } + + /* does not really matter how much we write it is just to set EOF + * this also sets the entire COW bitmap + * to zero without having to allocate it + */ + err = cow_write_file(fd, &zero, sizeof(zero)); + if(err != sizeof(zero)){ + cow_printf("Write of bitmap to new COW file '%s' failed, " + "err = %d\n", cow_file, -err); + err = -EINVAL; + goto out; + } + + return(0); + + out: + return(err); +} + +/* + * --------------------------------------------------------------------------- + * Local variables: + * c-file-style: "linux" + * End: + */ diff --git a/arch/um/drivers/net_kern.c.orig b/arch/um/drivers/net_kern.c.orig new file mode 100644 index 000000000..4c2ee09b0 --- /dev/null +++ b/arch/um/drivers/net_kern.c.orig @@ -0,0 +1,870 @@ +/* + * Copyright (C) 2001 Lennert Buytenhek (buytenh@gnu.org) and + * James Leu (jleu@mindspring.net). + * Copyright (C) 2001 by various other people who didn't put their name here. + * Licensed under the GPL. + */ + +#include "linux/config.h" +#include "linux/kernel.h" +#include "linux/netdevice.h" +#include "linux/rtnetlink.h" +#include "linux/skbuff.h" +#include "linux/socket.h" +#include "linux/spinlock.h" +#include "linux/module.h" +#include "linux/init.h" +#include "linux/etherdevice.h" +#include "linux/list.h" +#include "linux/inetdevice.h" +#include "linux/ctype.h" +#include "linux/bootmem.h" +#include "user_util.h" +#include "kern_util.h" +#include "net_kern.h" +#include "net_user.h" +#include "mconsole_kern.h" +#include "init.h" +#include "irq_user.h" + +static spinlock_t opened_lock = SPIN_LOCK_UNLOCKED; +LIST_HEAD(opened); + +static int uml_net_rx(struct net_device *dev) +{ + struct uml_net_private *lp = dev->priv; + int pkt_len; + struct sk_buff *skb; + + /* If we can't allocate memory, try again next round. */ + if ((skb = dev_alloc_skb(dev->mtu)) == NULL) { + lp->stats.rx_dropped++; + return 0; + } + + skb->dev = dev; + skb_put(skb, dev->mtu); + skb->mac.raw = skb->data; + pkt_len = (*lp->read)(lp->fd, &skb, lp); + + if (pkt_len > 0) { + skb_trim(skb, pkt_len); + skb->protocol = (*lp->protocol)(skb); + netif_rx(skb); + + lp->stats.rx_bytes += skb->len; + lp->stats.rx_packets++; + return pkt_len; + } + + kfree_skb(skb); + return pkt_len; +} + +void uml_net_interrupt(int irq, void *dev_id, struct pt_regs *regs) +{ + struct net_device *dev = dev_id; + struct uml_net_private *lp = dev->priv; + int err; + + if(!netif_running(dev)) + return; + + spin_lock(&lp->lock); + while((err = uml_net_rx(dev)) > 0) ; + if(err < 0) { + printk(KERN_ERR + "Device '%s' read returned %d, shutting it down\n", + dev->name, err); + dev_close(dev); + goto out; + } + reactivate_fd(lp->fd, UM_ETH_IRQ); + + out: + spin_unlock(&lp->lock); +} + +static int uml_net_open(struct net_device *dev) +{ + struct uml_net_private *lp = dev->priv; + char addr[sizeof("255.255.255.255\0")]; + int err; + + spin_lock(&lp->lock); + + if(lp->fd >= 0){ + err = -ENXIO; + goto out; + } + + if(!lp->have_mac){ + dev_ip_addr(dev, addr, &lp->mac[2]); + set_ether_mac(dev, lp->mac); + } + + lp->fd = (*lp->open)(&lp->user); + if(lp->fd < 0){ + err = lp->fd; + goto out; + } + + err = um_request_irq(dev->irq, lp->fd, IRQ_READ, uml_net_interrupt, + SA_INTERRUPT | SA_SHIRQ, dev->name, dev); + if(err != 0){ + printk(KERN_ERR "uml_net_open: failed to get irq(%d)\n", err); + if(lp->close != NULL) (*lp->close)(lp->fd, &lp->user); + lp->fd = -1; + err = -ENETUNREACH; + } + + lp->tl.data = (unsigned long) &lp->user; + netif_start_queue(dev); + + spin_lock(&opened_lock); + list_add(&lp->list, &opened); + spin_unlock(&opened_lock); + MOD_INC_USE_COUNT; + out: + spin_unlock(&lp->lock); + return(err); +} + +static int uml_net_close(struct net_device *dev) +{ + struct uml_net_private *lp = dev->priv; + + netif_stop_queue(dev); + spin_lock(&lp->lock); + + free_irq(dev->irq, dev); + if(lp->close != NULL) (*lp->close)(lp->fd, &lp->user); + lp->fd = -1; + spin_lock(&opened_lock); + list_del(&lp->list); + spin_unlock(&opened_lock); + + MOD_DEC_USE_COUNT; + spin_unlock(&lp->lock); + return 0; +} + +static int uml_net_start_xmit(struct sk_buff *skb, struct net_device *dev) +{ + struct uml_net_private *lp = dev->priv; + unsigned long flags; + int len; + + netif_stop_queue(dev); + + spin_lock_irqsave(&lp->lock, flags); + + len = (*lp->write)(lp->fd, &skb, lp); + + if(len == skb->len) { + lp->stats.tx_packets++; + lp->stats.tx_bytes += skb->len; + dev->trans_start = jiffies; + netif_start_queue(dev); + + /* this is normally done in the interrupt when tx finishes */ + netif_wake_queue(dev); + } + else if(len == 0){ + netif_start_queue(dev); + lp->stats.tx_dropped++; + } + else { + netif_start_queue(dev); + printk(KERN_ERR "uml_net_start_xmit: failed(%d)\n", len); + } + + spin_unlock_irqrestore(&lp->lock, flags); + + dev_kfree_skb(skb); + + return 0; +} + +static struct net_device_stats *uml_net_get_stats(struct net_device *dev) +{ + struct uml_net_private *lp = dev->priv; + return &lp->stats; +} + +static void uml_net_set_multicast_list(struct net_device *dev) +{ + if (dev->flags & IFF_PROMISC) return; + else if (dev->mc_count) dev->flags |= IFF_ALLMULTI; + else dev->flags &= ~IFF_ALLMULTI; +} + +static void uml_net_tx_timeout(struct net_device *dev) +{ + dev->trans_start = jiffies; + netif_wake_queue(dev); +} + +static int uml_net_set_mac(struct net_device *dev, void *addr) +{ + struct uml_net_private *lp = dev->priv; + struct sockaddr *hwaddr = addr; + + spin_lock(&lp->lock); + memcpy(dev->dev_addr, hwaddr->sa_data, ETH_ALEN); + spin_unlock(&lp->lock); + + return(0); +} + +static int uml_net_change_mtu(struct net_device *dev, int new_mtu) +{ + struct uml_net_private *lp = dev->priv; + int err = 0; + + spin_lock(&lp->lock); + + new_mtu = (*lp->set_mtu)(new_mtu, &lp->user); + if(new_mtu < 0){ + err = new_mtu; + goto out; + } + + dev->mtu = new_mtu; + + out: + spin_unlock(&lp->lock); + return err; +} + +static int uml_net_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) +{ + return(-EINVAL); +} + +void uml_net_user_timer_expire(unsigned long _conn) +{ +#ifdef undef + struct connection *conn = (struct connection *)_conn; + + dprintk(KERN_INFO "uml_net_user_timer_expire [%p]\n", conn); + do_connect(conn); +#endif +} + +/* + * default do nothing hard header packet routines for struct net_device init. + * real ethernet transports will overwrite with real routines. + */ +static int uml_net_hard_header(struct sk_buff *skb, struct net_device *dev, + unsigned short type, void *daddr, void *saddr, unsigned len) +{ + return(0); /* no change */ +} + +static int uml_net_rebuild_header(struct sk_buff *skb) +{ + return(0); /* ignore */ +} + +static int uml_net_header_cache(struct neighbour *neigh, struct hh_cache *hh) +{ + return(-1); /* fail */ +} + +static void uml_net_header_cache_update(struct hh_cache *hh, + struct net_device *dev, unsigned char * haddr) +{ + /* ignore */ +} + +static int uml_net_header_parse(struct sk_buff *skb, unsigned char *haddr) +{ + return(0); /* nothing */ +} + +static spinlock_t devices_lock = SPIN_LOCK_UNLOCKED; +static struct list_head devices = LIST_HEAD_INIT(devices); + +static int eth_configure(int n, void *init, char *mac, + struct transport *transport) +{ + struct uml_net *device; + struct net_device *dev; + struct uml_net_private *lp; + int err, size; + + size = transport->private_size + sizeof(struct uml_net_private) + + sizeof(((struct uml_net_private *) 0)->user); + + device = kmalloc(sizeof(*device), GFP_KERNEL); + if (device == NULL) { + printk(KERN_ERR "eth_configure failed to allocate uml_net\n"); + return(1); + } + + memset(device, 0, sizeof(*device)); + INIT_LIST_HEAD(&device->list); + device->index = n; + + spin_lock(&devices_lock); + list_add(&device->list, &devices); + spin_unlock(&devices_lock); + + if (setup_etheraddr(mac, device->mac)) + device->have_mac = 1; + + printk(KERN_INFO "Netdevice %d ", n); + if (device->have_mac) + printk("(%02x:%02x:%02x:%02x:%02x:%02x) ", + device->mac[0], device->mac[1], + device->mac[2], device->mac[3], + device->mac[4], device->mac[5]); + printk(": "); + dev = alloc_etherdev(size); + if (dev == NULL) { + printk(KERN_ERR "eth_configure: failed to allocate device\n"); + return 1; + } + + /* If this name ends up conflicting with an existing registered + * netdevice, that is OK, register_netdev{,ice}() will notice this + * and fail. + */ + snprintf(dev->name, sizeof(dev->name), "eth%d", n); + device->dev = dev; + + dev->hard_header = uml_net_hard_header; + dev->rebuild_header = uml_net_rebuild_header; + dev->hard_header_cache = uml_net_header_cache; + dev->header_cache_update= uml_net_header_cache_update; + dev->hard_header_parse = uml_net_header_parse; + + (*transport->kern->init)(dev, init); + + dev->mtu = transport->user->max_packet; + dev->open = uml_net_open; + dev->hard_start_xmit = uml_net_start_xmit; + dev->stop = uml_net_close; + dev->get_stats = uml_net_get_stats; + dev->set_multicast_list = uml_net_set_multicast_list; + dev->tx_timeout = uml_net_tx_timeout; + dev->set_mac_address = uml_net_set_mac; + dev->change_mtu = uml_net_change_mtu; + dev->do_ioctl = uml_net_ioctl; + dev->watchdog_timeo = (HZ >> 1); + dev->irq = UM_ETH_IRQ; + + rtnl_lock(); + err = register_netdevice(dev); + rtnl_unlock(); + if (err) { + device->dev = NULL; + /* XXX: should we call ->remove() here? */ + free_netdev(dev); + return 1; + } + lp = dev->priv; + + INIT_LIST_HEAD(&lp->list); + spin_lock_init(&lp->lock); + lp->dev = dev; + lp->fd = -1; + lp->mac = { 0xfe, 0xfd, 0x0, 0x0, 0x0, 0x0 }; + lp->have_mac = device->have_mac; + lp->protocol = transport->kern->protocol; + lp->open = transport->user->open; + lp->close = transport->user->close; + lp->remove = transport->user->remove; + lp->read = transport->kern->read; + lp->write = transport->kern->write; + lp->add_address = transport->user->add_address; + lp->delete_address = transport->user->delete_address; + lp->set_mtu = transport->user->set_mtu; + + init_timer(&lp->tl); + lp->tl.function = uml_net_user_timer_expire; + if (lp->have_mac) + memcpy(lp->mac, device->mac, sizeof(lp->mac)); + + if (transport->user->init) + (*transport->user->init)(&lp->user, dev); + + if (device->have_mac) + set_ether_mac(dev, device->mac); + return(0); +} + +static struct uml_net *find_device(int n) +{ + struct uml_net *device; + struct list_head *ele; + + spin_lock(&devices_lock); + list_for_each(ele, &devices){ + device = list_entry(ele, struct uml_net, list); + if(device->index == n) + goto out; + } + device = NULL; + out: + spin_unlock(&devices_lock); + return(device); +} + +static int eth_parse(char *str, int *index_out, char **str_out) +{ + char *end; + int n; + + n = simple_strtoul(str, &end, 0); + if(end == str){ + printk(KERN_ERR "eth_setup: Failed to parse '%s'\n", str); + return(1); + } + if(n < 0){ + printk(KERN_ERR "eth_setup: device %d is negative\n", n); + return(1); + } + str = end; + if(*str != '='){ + printk(KERN_ERR + "eth_setup: expected '=' after device number\n"); + return(1); + } + str++; + if(find_device(n)){ + printk(KERN_ERR "eth_setup: Device %d already configured\n", + n); + return(1); + } + if(index_out) *index_out = n; + *str_out = str; + return(0); +} + +struct eth_init { + struct list_head list; + char *init; + int index; +}; + +/* Filled in at boot time. Will need locking if the transports become + * modular. + */ +struct list_head transports = LIST_HEAD_INIT(transports); + +/* Filled in during early boot */ +struct list_head eth_cmd_line = LIST_HEAD_INIT(eth_cmd_line); + +static int check_transport(struct transport *transport, char *eth, int n, + void **init_out, char **mac_out) +{ + int len; + + len = strlen(transport->name); + if(strncmp(eth, transport->name, len)) + return(0); + + eth += len; + if(*eth == ',') + eth++; + else if(*eth != '\0') + return(0); + + *init_out = kmalloc(transport->setup_size, GFP_KERNEL); + if(*init_out == NULL) + return(1); + + if(!transport->setup(eth, mac_out, *init_out)){ + kfree(*init_out); + *init_out = NULL; + } + return(1); +} + +void register_transport(struct transport *new) +{ + struct list_head *ele, *next; + struct eth_init *eth; + void *init; + char *mac = NULL; + int match; + + list_add(&new->list, &transports); + + list_for_each_safe(ele, next, ð_cmd_line){ + eth = list_entry(ele, struct eth_init, list); + match = check_transport(new, eth->init, eth->index, &init, + &mac); + if(!match) + continue; + else if(init != NULL){ + eth_configure(eth->index, init, mac, new); + kfree(init); + } + list_del(ð->list); + } +} + +static int eth_setup_common(char *str, int index) +{ + struct list_head *ele; + struct transport *transport; + void *init; + char *mac = NULL; + + list_for_each(ele, &transports){ + transport = list_entry(ele, struct transport, list); + if(!check_transport(transport, str, index, &init, &mac)) + continue; + if(init != NULL){ + eth_configure(index, init, mac, transport); + kfree(init); + } + return(1); + } + return(0); +} + +static int eth_setup(char *str) +{ + struct eth_init *new; + int n, err; + + err = eth_parse(str, &n, &str); + if(err) return(1); + + new = alloc_bootmem(sizeof(new)); + if (new == NULL){ + printk("eth_init : alloc_bootmem failed\n"); + return(1); + } + + INIT_LIST_HEAD(&new->list); + new->index = n; + new->init = str; + + list_add_tail(&new->list, ð_cmd_line); + return(1); +} + +__setup("eth", eth_setup); +__uml_help(eth_setup, +"eth[0-9]+=,\n" +" Configure a network device.\n\n" +); + +static int eth_init(void) +{ + struct list_head *ele, *next; + struct eth_init *eth; + + list_for_each_safe(ele, next, ð_cmd_line){ + eth = list_entry(ele, struct eth_init, list); + + if(eth_setup_common(eth->init, eth->index)) + list_del(ð->list); + } + + return(1); +} + +__initcall(eth_init); + +static int net_config(char *str) +{ + int n, err; + + err = eth_parse(str, &n, &str); + if(err) return(err); + + str = uml_strdup(str); + if(str == NULL){ + printk(KERN_ERR "net_config failed to strdup string\n"); + return(-1); + } + err = !eth_setup_common(str, n); + if(err) + kfree(str); + return(err); +} + +static int net_remove(char *str) +{ + struct uml_net *device; + struct net_device *dev; + struct uml_net_private *lp; + char *end; + int n; + + n = simple_strtoul(str, &end, 0); + if((*end != '\0') || (end == str)) + return(-1); + + device = find_device(n); + if(device == NULL) + return(0); + + dev = device->dev; + lp = dev->priv; + if(lp->fd > 0) return(-1); + if(lp->remove != NULL) (*lp->remove)(&lp->user); + unregister_netdev(dev); + + list_del(&device->list); + free_netdev(device); + return(0); +} + +static struct mc_device net_mc = { + .name = "eth", + .config = net_config, + .get_config = NULL, + .remove = net_remove, +}; + +static int uml_inetaddr_event(struct notifier_block *this, unsigned long event, + void *ptr) +{ + struct in_ifaddr *ifa = ptr; + u32 addr = ifa->ifa_address; + u32 netmask = ifa->ifa_mask; + struct net_device *dev = ifa->ifa_dev->dev; + struct uml_net_private *lp; + void (*proc)(unsigned char *, unsigned char *, void *); + unsigned char addr_buf[4], netmask_buf[4]; + + if(dev->open != uml_net_open) return(NOTIFY_DONE); + + lp = dev->priv; + + proc = NULL; + switch (event){ + case NETDEV_UP: + proc = lp->add_address; + break; + case NETDEV_DOWN: + proc = lp->delete_address; + break; + } + if(proc != NULL){ + addr_buf[0] = addr & 0xff; + addr_buf[1] = (addr >> 8) & 0xff; + addr_buf[2] = (addr >> 16) & 0xff; + addr_buf[3] = addr >> 24; + netmask_buf[0] = netmask & 0xff; + netmask_buf[1] = (netmask >> 8) & 0xff; + netmask_buf[2] = (netmask >> 16) & 0xff; + netmask_buf[3] = netmask >> 24; + (*proc)(addr_buf, netmask_buf, &lp->user); + } + return(NOTIFY_DONE); +} + +struct notifier_block uml_inetaddr_notifier = { + .notifier_call = uml_inetaddr_event, +}; + +static int uml_net_init(void) +{ + struct list_head *ele; + struct uml_net_private *lp; + struct in_device *ip; + struct in_ifaddr *in; + + mconsole_register_dev(&net_mc); + register_inetaddr_notifier(¨_inetaddr_notifier); + + /* Devices may have been opened already, so the uml_inetaddr_notifier + * didn't get a chance to run for them. This fakes it so that + * addresses which have already been set up get handled properly. + */ + list_for_each(ele, &opened){ + lp = list_entry(ele, struct uml_net_private, list); + ip = lp->dev->ip_ptr; + if(ip == NULL) continue; + in = ip->ifa_list; + while(in != NULL){ + uml_inetaddr_event(NULL, NETDEV_UP, in); + in = in->ifa_next; + } + } + + return(0); +} + +__initcall(uml_net_init); + +static void close_devices(void) +{ + struct list_head *ele; + struct uml_net_private *lp; + + list_for_each(ele, &opened){ + lp = list_entry(ele, struct uml_net_private, list); + if(lp->close != NULL) (*lp->close)(lp->fd, &lp->user); + if(lp->remove != NULL) (*lp->remove)(&lp->user); + } +} + +__uml_exitcall(close_devices); + +int setup_etheraddr(char *str, unsigned char *addr) +{ + char *end; + int i; + + if(str == NULL) + return(0); + for(i=0;i<6;i++){ + addr[i] = simple_strtoul(str, &end, 16); + if((end == str) || + ((*end != ':') && (*end != ',') && (*end != '\0'))){ + printk(KERN_ERR + "setup_etheraddr: failed to parse '%s' " + "as an ethernet address\n", str); + return(0); + } + str = end + 1; + } + if(addr[0] & 1){ + printk(KERN_ERR + "Attempt to assign a broadcast ethernet address to a " + "device disallowed\n"); + return(0); + } + return(1); +} + +void dev_ip_addr(void *d, char *buf, char *bin_buf) +{ + struct net_device *dev = d; + struct in_device *ip = dev->ip_ptr; + struct in_ifaddr *in; + u32 addr; + + if((ip == NULL) || ((in = ip->ifa_list) == NULL)){ + printk(KERN_WARNING "dev_ip_addr - device not assigned an " + "IP address\n"); + return; + } + addr = in->ifa_address; + sprintf(buf, "%d.%d.%d.%d", addr & 0xff, (addr >> 8) & 0xff, + (addr >> 16) & 0xff, addr >> 24); + if(bin_buf){ + bin_buf[0] = addr & 0xff; + bin_buf[1] = (addr >> 8) & 0xff; + bin_buf[2] = (addr >> 16) & 0xff; + bin_buf[3] = addr >> 24; + } +} + +void set_ether_mac(void *d, unsigned char *addr) +{ + struct net_device *dev = d; + + memcpy(dev->dev_addr, addr, ETH_ALEN); +} + +struct sk_buff *ether_adjust_skb(struct sk_buff *skb, int extra) +{ + if((skb != NULL) && (skb_tailroom(skb) < extra)){ + struct sk_buff *skb2; + + skb2 = skb_copy_expand(skb, 0, extra, GFP_ATOMIC); + dev_kfree_skb(skb); + skb = skb2; + } + if(skb != NULL) skb_put(skb, extra); + return(skb); +} + +void iter_addresses(void *d, void (*cb)(unsigned char *, unsigned char *, + void *), + void *arg) +{ + struct net_device *dev = d; + struct in_device *ip = dev->ip_ptr; + struct in_ifaddr *in; + unsigned char address[4], netmask[4]; + + if(ip == NULL) return; + in = ip->ifa_list; + while(in != NULL){ + address[0] = in->ifa_address & 0xff; + address[1] = (in->ifa_address >> 8) & 0xff; + address[2] = (in->ifa_address >> 16) & 0xff; + address[3] = in->ifa_address >> 24; + netmask[0] = in->ifa_mask & 0xff; + netmask[1] = (in->ifa_mask >> 8) & 0xff; + netmask[2] = (in->ifa_mask >> 16) & 0xff; + netmask[3] = in->ifa_mask >> 24; + (*cb)(address, netmask, arg); + in = in->ifa_next; + } +} + +int dev_netmask(void *d, void *m) +{ + struct net_device *dev = d; + struct in_device *ip = dev->ip_ptr; + struct in_ifaddr *in; + __u32 *mask_out = m; + + if(ip == NULL) + return(1); + + in = ip->ifa_list; + if(in == NULL) + return(1); + + *mask_out = in->ifa_mask; + return(0); +} + +void *get_output_buffer(int *len_out) +{ + void *ret; + + ret = (void *) __get_free_pages(GFP_KERNEL, 0); + if(ret) *len_out = PAGE_SIZE; + else *len_out = 0; + return(ret); +} + +void free_output_buffer(void *buffer) +{ + free_pages((unsigned long) buffer, 0); +} + +int tap_setup_common(char *str, char *type, char **dev_name, char **mac_out, + char **gate_addr) +{ + char *remain; + + remain = split_if_spec(str, dev_name, mac_out, gate_addr, NULL); + if(remain != NULL){ + printk("tap_setup_common - Extra garbage on specification : " + "'%s'\n", remain); + return(1); + } + + return(0); +} + +unsigned short eth_protocol(struct sk_buff *skb) +{ + return(eth_type_trans(skb, skb->dev)); +} + +/* + * Overrides for Emacs so that we follow Linus's tabbing style. + * Emacs will notice this stuff at the end of the file and automatically + * adjust the settings for this buffer only. This must remain at the end + * of the file. + * --------------------------------------------------------------------------- + * Local variables: + * c-file-style: "linux" + * End: + */ diff --git a/arch/um/include/irq_kern.h b/arch/um/include/irq_kern.h new file mode 100644 index 000000000..4bcb829d7 --- /dev/null +++ b/arch/um/include/irq_kern.h @@ -0,0 +1,28 @@ +/* + * Copyright (C) 2001, 2002 Jeff Dike (jdike@karaya.com) + * Licensed under the GPL + */ + +#ifndef __IRQ_KERN_H__ +#define __IRQ_KERN_H__ + +#include "linux/interrupt.h" + +extern int um_request_irq(unsigned int irq, int fd, int type, + irqreturn_t (*handler)(int, void *, + struct pt_regs *), + unsigned long irqflags, const char * devname, + void *dev_id); + +#endif + +/* + * Overrides for Emacs so that we follow Linus's tabbing style. + * Emacs will notice this stuff at the end of the file and automatically + * adjust the settings for this buffer only. This must remain at the end + * of the file. + * --------------------------------------------------------------------------- + * Local variables: + * c-file-style: "linux" + * End: + */ diff --git a/arch/um/include/mem_kern.h b/arch/um/include/mem_kern.h new file mode 100644 index 000000000..b39f03d94 --- /dev/null +++ b/arch/um/include/mem_kern.h @@ -0,0 +1,30 @@ +/* + * Copyright (C) 2003 Jeff Dike (jdike@addtoit.com) + * Licensed under the GPL + */ + +#ifndef __MEM_KERN_H__ +#define __MEM_KERN_H__ + +#include "linux/list.h" +#include "linux/types.h" + +struct remapper { + struct list_head list; + int (*proc)(int, unsigned long, int, __u64); +}; + +extern void register_remapper(struct remapper *info); + +#endif + +/* + * Overrides for Emacs so that we follow Linus's tabbing style. + * Emacs will notice this stuff at the end of the file and automatically + * adjust the settings for this buffer only. This must remain at the end + * of the file. + * --------------------------------------------------------------------------- + * Local variables: + * c-file-style: "linux" + * End: + */ diff --git a/arch/um/kernel/physmem.c b/arch/um/kernel/physmem.c new file mode 100644 index 000000000..d0e0f50dc --- /dev/null +++ b/arch/um/kernel/physmem.c @@ -0,0 +1,468 @@ +/* + * Copyright (C) 2000 - 2003 Jeff Dike (jdike@addtoit.com) + * Licensed under the GPL + */ + +#include "linux/mm.h" +#include "linux/ghash.h" +#include "linux/slab.h" +#include "linux/vmalloc.h" +#include "linux/bootmem.h" +#include "asm/types.h" +#include "asm/pgtable.h" +#include "kern_util.h" +#include "user_util.h" +#include "mode_kern.h" +#include "mem.h" +#include "mem_user.h" +#include "os.h" +#include "kern.h" +#include "init.h" + +#if 0 +static pgd_t physmem_pgd[PTRS_PER_PGD]; + +static struct phys_desc *lookup_mapping(void *addr) +{ + pgd = &physmem_pgd[pgd_index(addr)]; + if(pgd_none(pgd)) + return(NULL); + + pmd = pmd_offset(pgd, addr); + if(pmd_none(pmd)) + return(NULL); + + pte = pte_offset_kernel(pmd, addr); + return((struct phys_desc *) pte_val(pte)); +} + +static struct add_mapping(void *addr, struct phys_desc *new) +{ +} +#endif + +#define PHYS_HASHSIZE (8192) + +struct phys_desc; + +DEF_HASH_STRUCTS(virtmem, PHYS_HASHSIZE, struct phys_desc); + +struct phys_desc { + struct virtmem_ptrs virt_ptrs; + int fd; + __u64 offset; + void *virt; + unsigned long phys; + struct list_head list; +}; + +struct virtmem_table virtmem_hash; + +static int virt_cmp(void *virt1, void *virt2) +{ + return(virt1 != virt2); +} + +static int virt_hash(void *virt) +{ + unsigned long addr = ((unsigned long) virt) >> PAGE_SHIFT; + return(addr % PHYS_HASHSIZE); +} + +DEF_HASH(static, virtmem, struct phys_desc, virt_ptrs, void *, virt, virt_cmp, + virt_hash); + +LIST_HEAD(descriptor_mappings); + +struct desc_mapping { + int fd; + struct list_head list; + struct list_head pages; +}; + +static struct desc_mapping *find_mapping(int fd) +{ + struct desc_mapping *desc; + struct list_head *ele; + + list_for_each(ele, &descriptor_mappings){ + desc = list_entry(ele, struct desc_mapping, list); + if(desc->fd == fd) + return(desc); + } + + return(NULL); +} + +static struct desc_mapping *descriptor_mapping(int fd) +{ + struct desc_mapping *desc; + + desc = find_mapping(fd); + if(desc != NULL) + return(desc); + + desc = kmalloc(sizeof(*desc), GFP_ATOMIC); + if(desc == NULL) + return(NULL); + + *desc = ((struct desc_mapping) + { .fd = fd, + .list = LIST_HEAD_INIT(desc->list), + .pages = LIST_HEAD_INIT(desc->pages) }); + list_add(&desc->list, &descriptor_mappings); + + return(desc); +} + +int physmem_subst_mapping(void *virt, int fd, __u64 offset, int w) +{ + struct desc_mapping *fd_maps; + struct phys_desc *desc; + unsigned long phys; + int err; + + fd_maps = descriptor_mapping(fd); + if(fd_maps == NULL) + return(-ENOMEM); + + phys = __pa(virt); + if(find_virtmem_hash(&virtmem_hash, virt) != NULL) + panic("Address 0x%p is already substituted\n", virt); + + err = -ENOMEM; + desc = kmalloc(sizeof(*desc), GFP_ATOMIC); + if(desc == NULL) + goto out; + + *desc = ((struct phys_desc) + { .virt_ptrs = { NULL, NULL }, + .fd = fd, + .offset = offset, + .virt = virt, + .phys = __pa(virt), + .list = LIST_HEAD_INIT(desc->list) }); + insert_virtmem_hash(&virtmem_hash, desc); + + list_add(&desc->list, &fd_maps->pages); + + virt = (void *) ((unsigned long) virt & PAGE_MASK); + err = os_map_memory(virt, fd, offset, PAGE_SIZE, 1, w, 0); + if(!err) + goto out; + + remove_virtmem_hash(&virtmem_hash, desc); + kfree(desc); + out: + return(err); +} + +static int physmem_fd = -1; + +static void remove_mapping(struct phys_desc *desc) +{ + void *virt = desc->virt; + int err; + + remove_virtmem_hash(&virtmem_hash, desc); + list_del(&desc->list); + kfree(desc); + + err = os_map_memory(virt, physmem_fd, __pa(virt), PAGE_SIZE, 1, 1, 0); + if(err) + panic("Failed to unmap block device page from physical memory, " + "errno = %d", -err); +} + +int physmem_remove_mapping(void *virt) +{ + struct phys_desc *desc; + + virt = (void *) ((unsigned long) virt & PAGE_MASK); + desc = find_virtmem_hash(&virtmem_hash, virt); + if(desc == NULL) + return(0); + + remove_mapping(desc); + return(1); +} + +void physmem_forget_descriptor(int fd) +{ + struct desc_mapping *desc; + struct phys_desc *page; + struct list_head *ele, *next; + __u64 offset; + void *addr; + int err; + + desc = find_mapping(fd); + if(desc == NULL) + return; + + list_for_each_safe(ele, next, &desc->pages){ + page = list_entry(ele, struct phys_desc, list); + offset = page->offset; + addr = page->virt; + remove_mapping(page); + err = os_seek_file(fd, offset); + if(err) + panic("physmem_forget_descriptor - failed to seek " + "to %lld in fd %d, error = %d\n", + offset, fd, -err); + err = os_read_file(fd, addr, PAGE_SIZE); + if(err < 0) + panic("physmem_forget_descriptor - failed to read " + "from fd %d to 0x%p, error = %d\n", + fd, addr, -err); + } + + list_del(&desc->list); + kfree(desc); +} + +void arch_free_page(struct page *page, int order) +{ + void *virt; + int i; + + for(i = 0; i < (1 << order); i++){ + virt = __va(page_to_phys(page + i)); + physmem_remove_mapping(virt); + } +} + +int is_remapped(void *virt) +{ + return(find_virtmem_hash(&virtmem_hash, virt) != NULL); +} + +/* Changed during early boot */ +unsigned long high_physmem; + +extern unsigned long physmem_size; + +void *to_virt(unsigned long phys) +{ + return((void *) uml_physmem + phys); +} + +unsigned long to_phys(void *virt) +{ + return(((unsigned long) virt) - uml_physmem); +} + +int init_maps(unsigned long physmem, unsigned long iomem, unsigned long highmem) +{ + struct page *p, *map; + unsigned long phys_len, phys_pages, highmem_len, highmem_pages; + unsigned long iomem_len, iomem_pages, total_len, total_pages; + int i; + + phys_pages = physmem >> PAGE_SHIFT; + phys_len = phys_pages * sizeof(struct page); + + iomem_pages = iomem >> PAGE_SHIFT; + iomem_len = iomem_pages * sizeof(struct page); + + highmem_pages = highmem >> PAGE_SHIFT; + highmem_len = highmem_pages * sizeof(struct page); + + total_pages = phys_pages + iomem_pages + highmem_pages; + total_len = phys_len + iomem_pages + highmem_len; + + if(kmalloc_ok){ + map = kmalloc(total_len, GFP_KERNEL); + if(map == NULL) + map = vmalloc(total_len); + } + else map = alloc_bootmem_low_pages(total_len); + + if(map == NULL) + return(-ENOMEM); + + for(i = 0; i < total_pages; i++){ + p = &map[i]; + set_page_count(p, 0); + SetPageReserved(p); + INIT_LIST_HEAD(&p->lru); + } + + mem_map = map; + max_mapnr = total_pages; + return(0); +} + +struct page *phys_to_page(const unsigned long phys) +{ + return(&mem_map[phys >> PAGE_SHIFT]); +} + +struct page *__virt_to_page(const unsigned long virt) +{ + return(&mem_map[__pa(virt) >> PAGE_SHIFT]); +} + +unsigned long page_to_phys(struct page *page) +{ + return((page - mem_map) << PAGE_SHIFT); +} + +pte_t mk_pte(struct page *page, pgprot_t pgprot) +{ + pte_t pte; + + pte_val(pte) = page_to_phys(page) + pgprot_val(pgprot); + if(pte_present(pte)) pte_mknewprot(pte_mknewpage(pte)); + return(pte); +} + +/* Changed during early boot */ +static unsigned long kmem_top = 0; + +unsigned long get_kmem_end(void) +{ + if(kmem_top == 0) + kmem_top = CHOOSE_MODE(kmem_end_tt, kmem_end_skas); + return(kmem_top); +} + +void map_memory(unsigned long virt, unsigned long phys, unsigned long len, + int r, int w, int x) +{ + __u64 offset; + int fd, err; + + fd = phys_mapping(phys, &offset); + err = os_map_memory((void *) virt, fd, offset, len, r, w, x); + if(err) + panic("map_memory(0x%lx, %d, 0x%llx, %ld, %d, %d, %d) failed, " + "err = %d\n", virt, fd, offset, len, r, w, x, err); +} + +#define PFN_UP(x) (((x) + PAGE_SIZE-1) >> PAGE_SHIFT) + +void setup_physmem(unsigned long start, unsigned long reserve_end, + unsigned long len, unsigned long highmem) +{ + unsigned long reserve = reserve_end - start; + int pfn = PFN_UP(__pa(reserve_end)); + int delta = (len - reserve) >> PAGE_SHIFT; + int err, offset, bootmap_size; + + physmem_fd = create_mem_file(len + highmem); + + offset = uml_reserved - uml_physmem; + err = os_map_memory((void *) uml_reserved, physmem_fd, offset, + len - offset, 1, 1, 0); + if(err < 0){ + os_print_error(err, "Mapping memory"); + exit(1); + } + + bootmap_size = init_bootmem(pfn, pfn + delta); + free_bootmem(__pa(reserve_end) + bootmap_size, + len - bootmap_size - reserve); +} + +int phys_mapping(unsigned long phys, __u64 *offset_out) +{ + struct phys_desc *desc = find_virtmem_hash(&virtmem_hash, + __va(phys & PAGE_MASK)); + int fd = -1; + + if(desc != NULL){ + fd = desc->fd; + *offset_out = desc->offset; + } + else if(phys < physmem_size){ + fd = physmem_fd; + *offset_out = phys; + } + else if(phys < __pa(end_iomem)){ + struct iomem_region *region = iomem_regions; + + while(region != NULL){ + if((phys >= region->phys) && + (phys < region->phys + region->size)){ + fd = region->fd; + *offset_out = phys - region->phys; + break; + } + region = region->next; + } + } + else if(phys < __pa(end_iomem) + highmem){ + fd = physmem_fd; + *offset_out = phys - iomem_size; + } + + return(fd); +} + +static int __init uml_mem_setup(char *line, int *add) +{ + char *retptr; + physmem_size = memparse(line,&retptr); + return 0; +} +__uml_setup("mem=", uml_mem_setup, +"mem=\n" +" This controls how much \"physical\" memory the kernel allocates\n" +" for the system. The size is specified as a number followed by\n" +" one of 'k', 'K', 'm', 'M', which have the obvious meanings.\n" +" This is not related to the amount of memory in the host. It can\n" +" be more, and the excess, if it's ever used, will just be swapped out.\n" +" Example: mem=64M\n\n" +); + +unsigned long find_iomem(char *driver, unsigned long *len_out) +{ + struct iomem_region *region = iomem_regions; + + while(region != NULL){ + if(!strcmp(region->driver, driver)){ + *len_out = region->size; + return(region->virt); + } + } + + return(0); +} + +int setup_iomem(void) +{ + struct iomem_region *region = iomem_regions; + unsigned long iomem_start = high_physmem + PAGE_SIZE; + int err; + + while(region != NULL){ + err = os_map_memory((void *) iomem_start, region->fd, 0, + region->size, 1, 1, 0); + if(err) + printk("Mapping iomem region for driver '%s' failed, " + "errno = %d\n", region->driver, -err); + else { + region->virt = iomem_start; + region->phys = __pa(region->virt); + } + + iomem_start += region->size + PAGE_SIZE; + region = region->next; + } + + return(0); +} + +__initcall(setup_iomem); + +/* + * Overrides for Emacs so that we follow Linus's tabbing style. + * Emacs will notice this stuff at the end of the file and automatically + * adjust the settings for this buffer only. This must remain at the end + * of the file. + * --------------------------------------------------------------------------- + * Local variables: + * c-file-style: "linux" + * End: + */ diff --git a/arch/um/kernel/skas/uaccess.c b/arch/um/kernel/skas/uaccess.c new file mode 100644 index 000000000..ea82f19b2 --- /dev/null +++ b/arch/um/kernel/skas/uaccess.c @@ -0,0 +1,219 @@ +/* + * Copyright (C) 2002 - 2003 Jeff Dike (jdike@addtoit.com) + * Licensed under the GPL + */ + +#include "linux/stddef.h" +#include "linux/kernel.h" +#include "linux/string.h" +#include "linux/fs.h" +#include "linux/highmem.h" +#include "asm/page.h" +#include "asm/pgtable.h" +#include "asm/uaccess.h" +#include "kern_util.h" + +extern void *um_virt_to_phys(struct task_struct *task, unsigned long addr, + pte_t *pte_out); + +static unsigned long maybe_map(unsigned long virt, int is_write) +{ + pte_t pte; + int err; + + void *phys = um_virt_to_phys(current, virt, &pte); + int dummy_code; + + if(IS_ERR(phys) || (is_write && !pte_write(pte))){ + err = handle_page_fault(virt, 0, is_write, 0, &dummy_code); + if(err) + return(0); + phys = um_virt_to_phys(current, virt, NULL); + } + return((unsigned long) phys); +} + +static int do_op(unsigned long addr, int len, int is_write, + int (*op)(unsigned long addr, int len, void *arg), void *arg) +{ + struct page *page; + int n; + + addr = maybe_map(addr, is_write); + if(addr == -1) + return(-1); + + page = phys_to_page(addr); + addr = (unsigned long) kmap(page) + (addr & ~PAGE_MASK); + n = (*op)(addr, len, arg); + kunmap(page); + + return(n); +} + +static int buffer_op(unsigned long addr, int len, int is_write, + int (*op)(unsigned long addr, int len, void *arg), + void *arg) +{ + int size = min(PAGE_ALIGN(addr) - addr, (unsigned long) len); + int remain = len, n; + + n = do_op(addr, size, is_write, op, arg); + if(n != 0) + return(n < 0 ? remain : 0); + + addr += size; + remain -= size; + if(remain == 0) + return(0); + + while(addr < ((addr + remain) & PAGE_MASK)){ + n = do_op(addr, PAGE_SIZE, is_write, op, arg); + if(n != 0) + return(n < 0 ? remain : 0); + + addr += PAGE_SIZE; + remain -= PAGE_SIZE; + } + if(remain == 0) + return(0); + + n = do_op(addr, remain, is_write, op, arg); + if(n != 0) + return(n < 0 ? remain : 0); + return(0); +} + +static int copy_chunk_from_user(unsigned long from, int len, void *arg) +{ + unsigned long *to_ptr = arg, to = *to_ptr; + + memcpy((void *) to, (void *) from, len); + *to_ptr += len; + return(0); +} + +int copy_from_user_skas(void *to, const void *from, int n) +{ + if(segment_eq(get_fs(), KERNEL_DS)){ + memcpy(to, from, n); + return(0); + } + + return(access_ok_skas(VERIFY_READ, from, n) ? + buffer_op((unsigned long) from, n, 0, copy_chunk_from_user, &to): + n); +} + +static int copy_chunk_to_user(unsigned long to, int len, void *arg) +{ + unsigned long *from_ptr = arg, from = *from_ptr; + + memcpy((void *) to, (void *) from, len); + *from_ptr += len; + return(0); +} + +int copy_to_user_skas(void *to, const void *from, int n) +{ + if(segment_eq(get_fs(), KERNEL_DS)){ + memcpy(to, from, n); + return(0); + } + + return(access_ok_skas(VERIFY_WRITE, to, n) ? + buffer_op((unsigned long) to, n, 1, copy_chunk_to_user, &from) : + n); +} + +static int strncpy_chunk_from_user(unsigned long from, int len, void *arg) +{ + char **to_ptr = arg, *to = *to_ptr; + int n; + + strncpy(to, (void *) from, len); + n = strnlen(to, len); + *to_ptr += n; + + if(n < len) + return(1); + return(0); +} + +int strncpy_from_user_skas(char *dst, const char *src, int count) +{ + int n; + char *ptr = dst; + + if(segment_eq(get_fs(), KERNEL_DS)){ + strncpy(dst, src, count); + return(strnlen(dst, count)); + } + + if(!access_ok_skas(VERIFY_READ, src, 1)) + return(-EFAULT); + + n = buffer_op((unsigned long) src, count, 0, strncpy_chunk_from_user, + &ptr); + if(n != 0) + return(-EFAULT); + return(strnlen(dst, count)); +} + +static int clear_chunk(unsigned long addr, int len, void *unused) +{ + memset((void *) addr, 0, len); + return(0); +} + +int __clear_user_skas(void *mem, int len) +{ + return(buffer_op((unsigned long) mem, len, 1, clear_chunk, NULL)); +} + +int clear_user_skas(void *mem, int len) +{ + if(segment_eq(get_fs(), KERNEL_DS)){ + memset(mem, 0, len); + return(0); + } + + return(access_ok_skas(VERIFY_WRITE, mem, len) ? + buffer_op((unsigned long) mem, len, 1, clear_chunk, NULL) : len); +} + +static int strnlen_chunk(unsigned long str, int len, void *arg) +{ + int *len_ptr = arg, n; + + n = strnlen((void *) str, len); + *len_ptr += n; + + if(n < len) + return(1); + return(0); +} + +int strnlen_user_skas(const void *str, int len) +{ + int count = 0, n; + + if(segment_eq(get_fs(), KERNEL_DS)) + return(strnlen(str, len) + 1); + + n = buffer_op((unsigned long) str, len, 0, strnlen_chunk, &count); + if(n == 0) + return(count + 1); + return(-EFAULT); +} + +/* + * Overrides for Emacs so that we follow Linus's tabbing style. + * Emacs will notice this stuff at the end of the file and automatically + * adjust the settings for this buffer only. This must remain at the end + * of the file. + * --------------------------------------------------------------------------- + * Local variables: + * c-file-style: "linux" + * End: + */ diff --git a/arch/um/kernel/smp.c.orig b/arch/um/kernel/smp.c.orig new file mode 100644 index 000000000..34f826c08 --- /dev/null +++ b/arch/um/kernel/smp.c.orig @@ -0,0 +1,302 @@ +/* + * Copyright (C) 2000 Jeff Dike (jdike@karaya.com) + * Licensed under the GPL + */ + +#include "linux/config.h" + +#ifdef CONFIG_SMP + +#include "linux/sched.h" +#include "linux/module.h" +#include "linux/threads.h" +#include "linux/interrupt.h" +#include "linux/err.h" +#include "asm/smp.h" +#include "asm/processor.h" +#include "asm/spinlock.h" +#include "asm/hardirq.h" +#include "user_util.h" +#include "kern_util.h" +#include "kern.h" +#include "irq_user.h" +#include "os.h" + +/* CPU online map, set by smp_boot_cpus */ +unsigned long cpu_online_map = cpumask_of_cpu(0); + +EXPORT_SYMBOL(cpu_online_map); + +/* Per CPU bogomips and other parameters + * The only piece used here is the ipi pipe, which is set before SMP is + * started and never changed. + */ +struct cpuinfo_um cpu_data[NR_CPUS]; + +spinlock_t um_bh_lock = SPIN_LOCK_UNLOCKED; + +atomic_t global_bh_count; + +/* Not used by UML */ +unsigned char global_irq_holder = NO_PROC_ID; +unsigned volatile long global_irq_lock; + +/* Set when the idlers are all forked */ +int smp_threads_ready = 0; + +/* A statistic, can be a little off */ +int num_reschedules_sent = 0; + +/* Small, random number, never changed */ +unsigned long cache_decay_ticks = 5; + +/* Not changed after boot */ +struct task_struct *idle_threads[NR_CPUS]; + +void smp_send_reschedule(int cpu) +{ + write(cpu_data[cpu].ipi_pipe[1], "R", 1); + num_reschedules_sent++; +} + +static void show(char * str) +{ + int cpu = smp_processor_id(); + + printk(KERN_INFO "\n%s, CPU %d:\n", str, cpu); +} + +#define MAXCOUNT 100000000 + +static inline void wait_on_bh(void) +{ + int count = MAXCOUNT; + do { + if (!--count) { + show("wait_on_bh"); + count = ~0; + } + /* nothing .. wait for the other bh's to go away */ + } while (atomic_read(&global_bh_count) != 0); +} + +/* + * This is called when we want to synchronize with + * bottom half handlers. We need to wait until + * no other CPU is executing any bottom half handler. + * + * Don't wait if we're already running in an interrupt + * context or are inside a bh handler. + */ +void synchronize_bh(void) +{ + if (atomic_read(&global_bh_count) && !in_interrupt()) + wait_on_bh(); +} + +void smp_send_stop(void) +{ + int i; + + printk(KERN_INFO "Stopping all CPUs..."); + for(i = 0; i < num_online_cpus(); i++){ + if(i == current->thread_info->cpu) + continue; + write(cpu_data[i].ipi_pipe[1], "S", 1); + } + printk("done\n"); +} + +static cpumask_t smp_commenced_mask; +static cpumask_t smp_callin_map = CPU_MASK_NONE; + +static int idle_proc(void *cpup) +{ + int cpu = (int) cpup, err; + + err = os_pipe(cpu_data[cpu].ipi_pipe, 1, 1); + if(err) + panic("CPU#%d failed to create IPI pipe, errno = %d", cpu, + -err); + + activate_ipi(cpu_data[cpu].ipi_pipe[0], + current->thread.mode.tt.extern_pid); + + wmb(); + if (cpu_test_and_set(cpu, &smp_callin_map)) { + printk("huh, CPU#%d already present??\n", cpu); + BUG(); + } + + while (!cpu_isset(cpu, &smp_commenced_mask)) + cpu_relax(); + + cpu_set(cpu, cpu_online_map); + default_idle(); + return(0); +} + +static struct task_struct *idle_thread(int cpu) +{ + struct task_struct *new_task; + unsigned char c; + + current->thread.request.u.thread.proc = idle_proc; + current->thread.request.u.thread.arg = (void *) cpu; + new_task = do_fork(CLONE_VM | CLONE_IDLETASK, 0, NULL, 0, NULL, NULL); + if(IS_ERR(new_task)) panic("do_fork failed in idle_thread"); + + cpu_tasks[cpu] = ((struct cpu_task) + { .pid = new_task->thread.mode.tt.extern_pid, + .task = new_task } ); + idle_threads[cpu] = new_task; + CHOOSE_MODE(write(new_task->thread.mode.tt.switch_pipe[1], &c, + sizeof(c)), + ({ panic("skas mode doesn't support SMP"); })); + return(new_task); +} + +void smp_prepare_cpus(unsigned int maxcpus) +{ + struct task_struct *idle; + unsigned long waittime; + int err, cpu; + + cpu_set(0, cpu_online_map); + cpu_set(0, smp_callin_map); + + err = os_pipe(cpu_data[0].ipi_pipe, 1, 1); + if(err) panic("CPU#0 failed to create IPI pipe, errno = %d", -err); + + activate_ipi(cpu_data[0].ipi_pipe[0], + current->thread.mode.tt.extern_pid); + + for(cpu = 1; cpu < ncpus; cpu++){ + printk("Booting processor %d...\n", cpu); + + idle = idle_thread(cpu); + + init_idle(idle, cpu); + unhash_process(idle); + + waittime = 200000000; + while (waittime-- && !cpu_isset(cpu, smp_callin_map)) + cpu_relax(); + + if (cpu_isset(cpu, smp_callin_map)) + printk("done\n"); + else printk("failed\n"); + } +} + +void smp_prepare_boot_cpu(void) +{ + cpu_set(smp_processor_id(), cpu_online_map); +} + +int __cpu_up(unsigned int cpu) +{ + cpu_set(cpu, smp_commenced_mask); + while (!cpu_isset(cpu, cpu_online_map)) + mb(); + return(0); +} + +int setup_profiling_timer(unsigned int multiplier) +{ + printk(KERN_INFO "setup_profiling_timer\n"); + return(0); +} + +void smp_call_function_slave(int cpu); + +void IPI_handler(int cpu) +{ + unsigned char c; + int fd; + + fd = cpu_data[cpu].ipi_pipe[0]; + while (read(fd, &c, 1) == 1) { + switch (c) { + case 'C': + smp_call_function_slave(cpu); + break; + + case 'R': + set_tsk_need_resched(current); + break; + + case 'S': + printk("CPU#%d stopping\n", cpu); + while(1) + pause(); + break; + + default: + printk("CPU#%d received unknown IPI [%c]!\n", cpu, c); + break; + } + } +} + +int hard_smp_processor_id(void) +{ + return(pid_to_processor_id(os_getpid())); +} + +static spinlock_t call_lock = SPIN_LOCK_UNLOCKED; +static atomic_t scf_started; +static atomic_t scf_finished; +static void (*func)(void *info); +static void *info; + +void smp_call_function_slave(int cpu) +{ + atomic_inc(&scf_started); + (*func)(info); + atomic_inc(&scf_finished); +} + +int smp_call_function(void (*_func)(void *info), void *_info, int nonatomic, + int wait) +{ + int cpus = num_online_cpus() - 1; + int i; + + if (!cpus) + return 0; + + spin_lock_bh(&call_lock); + atomic_set(&scf_started, 0); + atomic_set(&scf_finished, 0); + func = _func; + info = _info; + + for (i=0;ithread_info->cpu) && + cpu_isset(i, cpu_online_map)) + write(cpu_data[i].ipi_pipe[1], "C", 1); + + while (atomic_read(&scf_started) != cpus) + barrier(); + + if (wait) + while (atomic_read(&scf_finished) != cpus) + barrier(); + + spin_unlock_bh(&call_lock); + return 0; +} + +#endif + +/* + * Overrides for Emacs so that we follow Linus's tabbing style. + * Emacs will notice this stuff at the end of the file and automatically + * adjust the settings for this buffer only. This must remain at the end + * of the file. + * --------------------------------------------------------------------------- + * Local variables: + * c-file-style: "linux" + * End: + */ diff --git a/arch/um/kernel/tt/uaccess.c b/arch/um/kernel/tt/uaccess.c new file mode 100644 index 000000000..9c8401120 --- /dev/null +++ b/arch/um/kernel/tt/uaccess.c @@ -0,0 +1,73 @@ +/* + * Copyright (C) 2000 - 2003 Jeff Dike (jdike@addtoit.com) + * Licensed under the GPL + */ + +#include "linux/sched.h" +#include "asm/uaccess.h" + +int copy_from_user_tt(void *to, const void *from, int n) +{ + if(!access_ok_tt(VERIFY_READ, from, n)) + return(n); + + return(__do_copy_from_user(to, from, n, ¤t->thread.fault_addr, + ¤t->thread.fault_catcher)); +} + +int copy_to_user_tt(void *to, const void *from, int n) +{ + if(!access_ok_tt(VERIFY_WRITE, to, n)) + return(n); + + return(__do_copy_to_user(to, from, n, ¤t->thread.fault_addr, + ¤t->thread.fault_catcher)); +} + +int strncpy_from_user_tt(char *dst, const char *src, int count) +{ + int n; + + if(!access_ok_tt(VERIFY_READ, src, 1)) + return(-EFAULT); + + n = __do_strncpy_from_user(dst, src, count, + ¤t->thread.fault_addr, + ¤t->thread.fault_catcher); + if(n < 0) return(-EFAULT); + return(n); +} + +int __clear_user_tt(void *mem, int len) +{ + return(__do_clear_user(mem, len, + ¤t->thread.fault_addr, + ¤t->thread.fault_catcher)); +} + +int clear_user_tt(void *mem, int len) +{ + if(!access_ok_tt(VERIFY_WRITE, mem, len)) + return(len); + + return(__do_clear_user(mem, len, ¤t->thread.fault_addr, + ¤t->thread.fault_catcher)); +} + +int strnlen_user_tt(const void *str, int len) +{ + return(__do_strnlen_user(str, len, + ¤t->thread.fault_addr, + ¤t->thread.fault_catcher)); +} + +/* + * Overrides for Emacs so that we follow Linus's tabbing style. + * Emacs will notice this stuff at the end of the file and automatically + * adjust the settings for this buffer only. This must remain at the end + * of the file. + * --------------------------------------------------------------------------- + * Local variables: + * c-file-style: "linux" + * End: + */ diff --git a/arch/um/os-Linux/user_syms.c b/arch/um/os-Linux/user_syms.c new file mode 100644 index 000000000..ef0fb71e4 --- /dev/null +++ b/arch/um/os-Linux/user_syms.c @@ -0,0 +1,88 @@ +#include "linux/types.h" +#include "linux/module.h" + +/* Some of this are builtin function (some are not but could in the future), + * so I *must* declare good prototypes for them and then EXPORT them. + * The kernel code uses the macro defined by include/linux/string.h, + * so I undef macros; the userspace code does not include that and I + * add an EXPORT for the glibc one.*/ + +#undef strlen +#undef strstr +#undef memcpy +#undef memset + +extern size_t strlen(const char *); +extern void *memcpy(void *, const void *, size_t); +extern void *memset(void *, int, size_t); +extern int printf(const char *, ...); + +EXPORT_SYMBOL(strlen); +EXPORT_SYMBOL(memcpy); +EXPORT_SYMBOL(memset); +EXPORT_SYMBOL(printf); + +EXPORT_SYMBOL(strstr); + +/* Here, instead, I can provide a fake prototype. Yes, someone cares: genksyms. + * However, the modules will use the CRC defined *here*, no matter if it is + * good; so the versions of these symbols will always match + */ +#define EXPORT_SYMBOL_PROTO(sym) \ + int sym(void); \ + EXPORT_SYMBOL(sym); + +EXPORT_SYMBOL_PROTO(__errno_location); + +EXPORT_SYMBOL_PROTO(access); +EXPORT_SYMBOL_PROTO(open); +EXPORT_SYMBOL_PROTO(open64); +EXPORT_SYMBOL_PROTO(close); +EXPORT_SYMBOL_PROTO(read); +EXPORT_SYMBOL_PROTO(write); +EXPORT_SYMBOL_PROTO(dup2); +EXPORT_SYMBOL_PROTO(__xstat); +EXPORT_SYMBOL_PROTO(__lxstat); +EXPORT_SYMBOL_PROTO(__lxstat64); +EXPORT_SYMBOL_PROTO(lseek); +EXPORT_SYMBOL_PROTO(lseek64); +EXPORT_SYMBOL_PROTO(chown); +EXPORT_SYMBOL_PROTO(truncate); +EXPORT_SYMBOL_PROTO(utime); +EXPORT_SYMBOL_PROTO(chmod); +EXPORT_SYMBOL_PROTO(rename); +EXPORT_SYMBOL_PROTO(__xmknod); + +EXPORT_SYMBOL_PROTO(symlink); +EXPORT_SYMBOL_PROTO(link); +EXPORT_SYMBOL_PROTO(unlink); +EXPORT_SYMBOL_PROTO(readlink); + +EXPORT_SYMBOL_PROTO(mkdir); +EXPORT_SYMBOL_PROTO(rmdir); +EXPORT_SYMBOL_PROTO(opendir); +EXPORT_SYMBOL_PROTO(readdir); +EXPORT_SYMBOL_PROTO(closedir); +EXPORT_SYMBOL_PROTO(seekdir); +EXPORT_SYMBOL_PROTO(telldir); + +EXPORT_SYMBOL_PROTO(ioctl); + +EXPORT_SYMBOL_PROTO(pread64); +EXPORT_SYMBOL_PROTO(pwrite64); + +EXPORT_SYMBOL_PROTO(statfs); +EXPORT_SYMBOL_PROTO(statfs64); + +EXPORT_SYMBOL_PROTO(getuid); + +/* + * Overrides for Emacs so that we follow Linus's tabbing style. + * Emacs will notice this stuff at the end of the file and automatically + * adjust the settings for this buffer only. This must remain at the end + * of the file. + * --------------------------------------------------------------------------- + * Local variables: + * c-file-style: "linux" + * End: + */ diff --git a/arch/um/sys-i386/time.c b/arch/um/sys-i386/time.c new file mode 100644 index 000000000..a6a5ba755 --- /dev/null +++ b/arch/um/sys-i386/time.c @@ -0,0 +1,24 @@ +/* + * sys-i386/time.c + * Created 25.9.2002 Sapan Bhatia + * + */ + +unsigned long long time_stamp(void) +{ + unsigned long low, high; + + asm("rdtsc" : "=a" (low), "=d" (high)); + return((((unsigned long long) high) << 32) + low); +} + +/* + * Overrides for Emacs so that we follow Linus's tabbing style. + * Emacs will notice this stuff at the end of the file and automatically + * adjust the settings for this buffer only. This must remain at the end + * of the file. + * --------------------------------------------------------------------------- + * Local variables: + * c-file-style: "linux" + * End: + */ diff --git a/fs/Makefile.orig b/fs/Makefile.orig new file mode 100644 index 000000000..a288c0cb3 --- /dev/null +++ b/fs/Makefile.orig @@ -0,0 +1,94 @@ +# +# Makefile for the Linux filesystems. +# +# 14 Sep 2000, Christoph Hellwig +# Rewritten to use lists instead of if-statements. +# + +obj-y := open.o read_write.o file_table.o buffer.o \ + bio.o super.o block_dev.o char_dev.o stat.o exec.o pipe.o \ + namei.o fcntl.o ioctl.o readdir.o select.o fifo.o locks.o \ + dcache.o inode.o attr.o bad_inode.o file.o dnotify.o \ + filesystems.o namespace.o seq_file.o xattr.o libfs.o \ + fs-writeback.o mpage.o direct-io.o aio.o + +obj-$(CONFIG_EPOLL) += eventpoll.o +obj-$(CONFIG_COMPAT) += compat.o + +nfsd-$(CONFIG_NFSD) := nfsctl.o +obj-y += $(nfsd-y) $(nfsd-m) + +obj-$(CONFIG_BINFMT_AOUT) += binfmt_aout.o +obj-$(CONFIG_BINFMT_EM86) += binfmt_em86.o +obj-$(CONFIG_BINFMT_MISC) += binfmt_misc.o + +# binfmt_script is always there +obj-y += binfmt_script.o + +obj-$(CONFIG_BINFMT_ELF) += binfmt_elf.o +obj-$(CONFIG_BINFMT_SOM) += binfmt_som.o +obj-$(CONFIG_BINFMT_FLAT) += binfmt_flat.o + +obj-$(CONFIG_FS_MBCACHE) += mbcache.o +obj-$(CONFIG_FS_POSIX_ACL) += posix_acl.o xattr_acl.o + +obj-$(CONFIG_QUOTA) += dquot.o +obj-$(CONFIG_QFMT_V1) += quota_v1.o +obj-$(CONFIG_QFMT_V2) += quota_v2.o +obj-$(CONFIG_QUOTACTL) += quota.o + +obj-$(CONFIG_PROC_FS) += proc/ +obj-y += partitions/ +obj-$(CONFIG_SYSFS) += sysfs/ +obj-y += devpts/ + +obj-$(CONFIG_PROFILING) += dcookies.o + +# Do not add any filesystems before this line +obj-$(CONFIG_REISERFS_FS) += reiserfs/ +obj-$(CONFIG_EXT3_FS) += ext3/ # Before ext2 so root fs can be ext3 +obj-$(CONFIG_JBD) += jbd/ +obj-$(CONFIG_EXT2_FS) += ext2/ +obj-$(CONFIG_CRAMFS) += cramfs/ +obj-$(CONFIG_RAMFS) += ramfs/ +obj-$(CONFIG_HUGETLBFS) += hugetlbfs/ +obj-$(CONFIG_CODA_FS) += coda/ +obj-$(CONFIG_INTERMEZZO_FS) += intermezzo/ +obj-$(CONFIG_MINIX_FS) += minix/ +obj-$(CONFIG_FAT_FS) += fat/ +obj-$(CONFIG_UMSDOS_FS) += umsdos/ +obj-$(CONFIG_MSDOS_FS) += msdos/ +obj-$(CONFIG_VFAT_FS) += vfat/ +obj-$(CONFIG_BFS_FS) += bfs/ +obj-$(CONFIG_ISO9660_FS) += isofs/ +obj-$(CONFIG_DEVFS_FS) += devfs/ +obj-$(CONFIG_HFSPLUS_FS) += hfsplus/ # Before hfs to find wrapped HFS+ +obj-$(CONFIG_HFS_FS) += hfs/ +obj-$(CONFIG_VXFS_FS) += freevxfs/ +obj-$(CONFIG_NFS_FS) += nfs/ +obj-$(CONFIG_EXPORTFS) += exportfs/ +obj-$(CONFIG_NFSD) += nfsd/ +obj-$(CONFIG_LOCKD) += lockd/ +obj-$(CONFIG_NLS) += nls/ +obj-$(CONFIG_SYSV_FS) += sysv/ +obj-$(CONFIG_SMB_FS) += smbfs/ +obj-$(CONFIG_CIFS) += cifs/ +obj-$(CONFIG_NCP_FS) += ncpfs/ +obj-$(CONFIG_HPFS_FS) += hpfs/ +obj-$(CONFIG_NTFS_FS) += ntfs/ +obj-$(CONFIG_UFS_FS) += ufs/ +obj-$(CONFIG_EFS_FS) += efs/ +obj-$(CONFIG_JFFS_FS) += jffs/ +obj-$(CONFIG_JFFS2_FS) += jffs2/ +obj-$(CONFIG_AFFS_FS) += affs/ +obj-$(CONFIG_ROMFS_FS) += romfs/ +obj-$(CONFIG_QNX4FS_FS) += qnx4/ +obj-$(CONFIG_AUTOFS_FS) += autofs/ +obj-$(CONFIG_AUTOFS4_FS) += autofs4/ +obj-$(CONFIG_ADFS_FS) += adfs/ +obj-$(CONFIG_UDF_FS) += udf/ +obj-$(CONFIG_SUN_OPENPROMFS) += openpromfs/ +obj-$(CONFIG_JFS_FS) += jfs/ +obj-$(CONFIG_XFS_FS) += xfs/ +obj-$(CONFIG_AFS_FS) += afs/ +obj-$(CONFIG_BEFS_FS) += befs/ diff --git a/fs/hostfs/Makefile b/fs/hostfs/Makefile new file mode 100644 index 000000000..794292e0a --- /dev/null +++ b/fs/hostfs/Makefile @@ -0,0 +1,26 @@ +# +# Copyright (C) 2000 Jeff Dike (jdike@karaya.com) +# Licensed under the GPL +# + +# struct stat64 changed the inode field name between 2.2 and 2.4 from st_ino +# to __st_ino. It stayed in the same place, so as long as the correct name +# is used, hostfs compiled on 2.2 should work on 2.4 and vice versa. + +STAT64_INO_FIELD := $(shell grep -q __st_ino /usr/include/bits/stat.h && \ + echo __)st_ino + +hostfs-objs := hostfs_kern.o hostfs_user.o + +obj-y = +obj-$(CONFIG_HOSTFS) += hostfs.o + +SINGLE_OBJS = $(foreach f,$(patsubst %.o,%,$(obj-y) $(obj-m)),$($(f)-objs)) + +USER_OBJS := $(filter %_user.o,$(obj-y) $(obj-m) $(SINGLE_OBJS)) +USER_OBJS := $(foreach file,$(USER_OBJS),$(obj)/$(file)) + +USER_CFLAGS += -DSTAT64_INO_FIELD=$(STAT64_INO_FIELD) + +$(USER_OBJS) : %.o: %.c + $(CC) $(CFLAGS_$(notdir $@)) $(USER_CFLAGS) -c -o $@ $< diff --git a/fs/hostfs/hostfs.h b/fs/hostfs/hostfs.h new file mode 100644 index 000000000..d1f6c339f --- /dev/null +++ b/fs/hostfs/hostfs.h @@ -0,0 +1,79 @@ +#ifndef __UM_FS_HOSTFS +#define __UM_FS_HOSTFS + +#include "os.h" + +/* These are exactly the same definitions as in fs.h, but the names are + * changed so that this file can be included in both kernel and user files. + */ + +#define HOSTFS_ATTR_MODE 1 +#define HOSTFS_ATTR_UID 2 +#define HOSTFS_ATTR_GID 4 +#define HOSTFS_ATTR_SIZE 8 +#define HOSTFS_ATTR_ATIME 16 +#define HOSTFS_ATTR_MTIME 32 +#define HOSTFS_ATTR_CTIME 64 +#define HOSTFS_ATTR_ATIME_SET 128 +#define HOSTFS_ATTR_MTIME_SET 256 +#define HOSTFS_ATTR_FORCE 512 /* Not a change, but a change it */ +#define HOSTFS_ATTR_ATTR_FLAG 1024 + +struct hostfs_iattr { + unsigned int ia_valid; + mode_t ia_mode; + uid_t ia_uid; + gid_t ia_gid; + loff_t ia_size; + struct timespec ia_atime; + struct timespec ia_mtime; + struct timespec ia_ctime; + unsigned int ia_attr_flags; +}; + +extern int stat_file(const char *path, unsigned long long *inode_out, + int *mode_out, int *nlink_out, int *uid_out, int *gid_out, + unsigned long long *size_out, struct timespec *atime_out, + struct timespec *mtime_out, struct timespec *ctime_out, + int *blksize_out, unsigned long long *blocks_out); +extern int access_file(char *path, int r, int w, int x); +extern int open_file(char *path, int r, int w, int append); +extern int file_type(const char *path, int *rdev); +extern void *open_dir(char *path, int *err_out); +extern char *read_dir(void *stream, unsigned long long *pos, + unsigned long long *ino_out, int *len_out); +extern void close_file(void *stream); +extern void close_dir(void *stream); +extern int read_file(int fd, unsigned long long *offset, char *buf, int len); +extern int write_file(int fd, unsigned long long *offset, const char *buf, + int len); +extern int lseek_file(int fd, long long offset, int whence); +extern int file_create(char *name, int ur, int uw, int ux, int gr, + int gw, int gx, int or, int ow, int ox); +extern int set_attr(const char *file, struct hostfs_iattr *attrs); +extern int make_symlink(const char *from, const char *to); +extern int unlink_file(const char *file); +extern int do_mkdir(const char *file, int mode); +extern int do_rmdir(const char *file); +extern int do_mknod(const char *file, int mode, int dev); +extern int link_file(const char *from, const char *to); +extern int do_readlink(char *file, char *buf, int size); +extern int rename_file(char *from, char *to); +extern int do_statfs(char *root, long *bsize_out, long long *blocks_out, + long long *bfree_out, long long *bavail_out, + long long *files_out, long long *ffree_out, + void *fsid_out, int fsid_size, long *namelen_out, + long *spare_out); + +#endif + +/* + * Overrides for Emacs so that we follow Linus's tabbing style. + * Emacs will notice this stuff at the end of the file and automatically + * adjust the settings for this buffer only. This must remain at the end + * of the file. + * --------------------------------------------------------------------------- + * Local variables: + * c-file-style: "linux" + * End: + */ diff --git a/fs/hostfs/hostfs_kern.c b/fs/hostfs/hostfs_kern.c new file mode 100644 index 000000000..ef5d5d1bf --- /dev/null +++ b/fs/hostfs/hostfs_kern.c @@ -0,0 +1,1008 @@ +/* + * Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com) + * Licensed under the GPL + * + * Ported the filesystem routines to 2.5. + * 2003-02-10 Petr Baudis + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include "hostfs.h" +#include "kern_util.h" +#include "kern.h" +#include "user_util.h" +#include "2_5compat.h" +#include "init.h" + +struct hostfs_inode_info { + char *host_filename; + int fd; + int mode; + struct inode vfs_inode; +}; + +static inline struct hostfs_inode_info *HOSTFS_I(struct inode *inode) +{ + return(list_entry(inode, struct hostfs_inode_info, vfs_inode)); +} + +#define FILE_HOSTFS_I(file) HOSTFS_I((file)->f_dentry->d_inode) + +int hostfs_d_delete(struct dentry *dentry) +{ + return(1); +} + +struct dentry_operations hostfs_dentry_ops = { + .d_delete = hostfs_d_delete, +}; + +/* Changed in hostfs_args before the kernel starts running */ +static char *root_ino = "/"; +static int append = 0; + +#define HOSTFS_SUPER_MAGIC 0x00c0ffee + +static struct inode_operations hostfs_iops; +static struct inode_operations hostfs_dir_iops; +static struct address_space_operations hostfs_link_aops; + +static int __init hostfs_args(char *options, int *add) +{ + char *ptr; + + ptr = strchr(options, ','); + if(ptr != NULL) + *ptr++ = '\0'; + if(*options != '\0') + root_ino = options; + + options = ptr; + while(options){ + ptr = strchr(options, ','); + if(ptr != NULL) + *ptr++ = '\0'; + if(*options != '\0'){ + if(!strcmp(options, "append")) + append = 1; + else printf("hostfs_args - unsupported option - %s\n", + options); + } + options = ptr; + } + return(0); +} + +__uml_setup("hostfs=", hostfs_args, +"hostfs=,,...\n" +" This is used to set hostfs parameters. The root directory argument\n" +" is used to confine all hostfs mounts to within the specified directory\n" +" tree on the host. If this isn't specified, then a user inside UML can\n" +" mount anything on the host that's accessible to the user that's running\n" +" it.\n" +" The only flag currently supported is 'append', which specifies that all\n" +" files opened by hostfs will be opened in append mode.\n\n" +); + +static char *dentry_name(struct dentry *dentry, int extra) +{ + struct dentry *parent; + char *root, *name; + int len; + + len = 0; + parent = dentry; + while(parent->d_parent != parent){ + len += parent->d_name.len + 1; + parent = parent->d_parent; + } + + root = HOSTFS_I(parent->d_inode)->host_filename; + len += strlen(root); + name = kmalloc(len + extra + 1, GFP_KERNEL); + if(name == NULL) return(NULL); + + name[len] = '\0'; + parent = dentry; + while(parent->d_parent != parent){ + len -= parent->d_name.len + 1; + name[len] = '/'; + strncpy(&name[len + 1], parent->d_name.name, + parent->d_name.len); + parent = parent->d_parent; + } + strncpy(name, root, strlen(root)); + return(name); +} + +static char *inode_name(struct inode *ino, int extra) +{ + struct dentry *dentry; + + dentry = list_entry(ino->i_dentry.next, struct dentry, d_alias); + return(dentry_name(dentry, extra)); +} + +static int read_name(struct inode *ino, char *name) +{ + /* The non-int inode fields are copied into ints by stat_file and + * then copied into the inode because passing the actual pointers + * in and having them treated as int * breaks on big-endian machines + */ + int err; + int i_mode, i_nlink, i_blksize; + unsigned long long i_size; + unsigned long long i_ino; + unsigned long long i_blocks; + + err = stat_file(name, &i_ino, &i_mode, &i_nlink, &ino->i_uid, + &ino->i_gid, &i_size, &ino->i_atime, &ino->i_mtime, + &ino->i_ctime, &i_blksize, &i_blocks); + if(err) + return(err); + + ino->i_ino = i_ino; + ino->i_mode = i_mode; + ino->i_nlink = i_nlink; + ino->i_size = i_size; + ino->i_blksize = i_blksize; + ino->i_blocks = i_blocks; + if((ino->i_sb->s_dev == ROOT_DEV) && (ino->i_uid == getuid())) + ino->i_uid = 0; + return(0); +} + +static char *follow_link(char *link) +{ + int len, n; + char *name, *resolved, *end; + + len = 64; + while(1){ + n = -ENOMEM; + name = kmalloc(len, GFP_KERNEL); + if(name == NULL) + goto out; + + n = do_readlink(link, name, len); + if(n < len) + break; + len *= 2; + kfree(name); + } + if(n < 0) + goto out_free; + + if(*name == '/') + return(name); + + end = strrchr(link, '/'); + if(end == NULL) + return(name); + + *(end + 1) = '\0'; + len = strlen(link) + strlen(name) + 1; + + resolved = kmalloc(len, GFP_KERNEL); + if(resolved == NULL){ + n = -ENOMEM; + goto out_free; + } + + sprintf(resolved, "%s%s", link, name); + kfree(name); + kfree(link); + return(resolved); + + out_free: + kfree(name); + out: + return(ERR_PTR(n)); +} + +static int read_inode(struct inode *ino) +{ + char *name; + int err = 0; + + /* Unfortunately, we are called from iget() when we don't have a dentry + * allocated yet. + */ + if(list_empty(&ino->i_dentry)) + goto out; + + err = -ENOMEM; + name = inode_name(ino, 0); + if(name == NULL) + goto out; + + if(file_type(name, NULL) == OS_TYPE_SYMLINK){ + name = follow_link(name); + if(IS_ERR(name)){ + err = PTR_ERR(name); + goto out; + } + } + + err = read_name(ino, name); + kfree(name); + out: + return(err); +} + +int hostfs_statfs(struct super_block *sb, struct kstatfs *sf) +{ + /* do_statfs uses struct statfs64 internally, but the linux kernel + * struct statfs still has 32-bit versions for most of these fields, + * so we convert them here + */ + int err; + long long f_blocks; + long long f_bfree; + long long f_bavail; + long long f_files; + long long f_ffree; + + err = do_statfs(HOSTFS_I(sb->s_root->d_inode)->host_filename, + &sf->f_bsize, &f_blocks, &f_bfree, &f_bavail, &f_files, + &f_ffree, &sf->f_fsid, sizeof(sf->f_fsid), + &sf->f_namelen, sf->f_spare); + if(err) return(err); + sf->f_blocks = f_blocks; + sf->f_bfree = f_bfree; + sf->f_bavail = f_bavail; + sf->f_files = f_files; + sf->f_ffree = f_ffree; + sf->f_type = HOSTFS_SUPER_MAGIC; + return(0); +} + +static struct inode *hostfs_alloc_inode(struct super_block *sb) +{ + struct hostfs_inode_info *hi; + + hi = kmalloc(sizeof(*hi), GFP_KERNEL); + if(hi == NULL) + return(NULL); + + *hi = ((struct hostfs_inode_info) { .host_filename = NULL, + .fd = -1, + .mode = 0 }); + inode_init_once(&hi->vfs_inode); + return(&hi->vfs_inode); +} + +static void hostfs_destroy_inode(struct inode *inode) +{ + if(HOSTFS_I(inode)->host_filename) + kfree(HOSTFS_I(inode)->host_filename); + + if(HOSTFS_I(inode)->fd != -1) + close_file(&HOSTFS_I(inode)->fd); + + kfree(HOSTFS_I(inode)); +} + +static void hostfs_read_inode(struct inode *inode) +{ + read_inode(inode); +} + +static struct super_operations hostfs_sbops = { + .alloc_inode = hostfs_alloc_inode, + .destroy_inode = hostfs_destroy_inode, + .read_inode = hostfs_read_inode, + .statfs = hostfs_statfs, +}; + +int hostfs_readdir(struct file *file, void *ent, filldir_t filldir) +{ + void *dir; + char *name; + unsigned long long next, ino; + int error, len; + + name = dentry_name(file->f_dentry, 0); + if(name == NULL) return(-ENOMEM); + dir = open_dir(name, &error); + kfree(name); + if(dir == NULL) return(-error); + next = file->f_pos; + while((name = read_dir(dir, &next, &ino, &len)) != NULL){ + error = (*filldir)(ent, name, len, file->f_pos, + ino, DT_UNKNOWN); + if(error) break; + file->f_pos = next; + } + close_dir(dir); + return(0); +} + +int hostfs_file_open(struct inode *ino, struct file *file) +{ + char *name; + int mode = 0, r = 0, w = 0, fd; + + mode = file->f_mode & (FMODE_READ | FMODE_WRITE); + if((mode & HOSTFS_I(ino)->mode) == mode) + return(0); + + /* The file may already have been opened, but with the wrong access, + * so this resets things and reopens the file with the new access. + */ + if(HOSTFS_I(ino)->fd != -1){ + close_file(&HOSTFS_I(ino)->fd); + HOSTFS_I(ino)->fd = -1; + } + + HOSTFS_I(ino)->mode |= mode; + if(HOSTFS_I(ino)->mode & FMODE_READ) + r = 1; + if(HOSTFS_I(ino)->mode & FMODE_WRITE) + w = 1; + if(w) + r = 1; + + name = dentry_name(file->f_dentry, 0); + if(name == NULL) + return(-ENOMEM); + + fd = open_file(name, r, w, append); + kfree(name); + if(fd < 0) return(fd); + FILE_HOSTFS_I(file)->fd = fd; + + return(0); +} + +int hostfs_fsync(struct file *file, struct dentry *dentry, int datasync) +{ + return(0); +} + +static struct file_operations hostfs_file_fops = { + .llseek = generic_file_llseek, + .read = generic_file_read, + .write = generic_file_write, + .mmap = generic_file_mmap, + .open = hostfs_file_open, + .release = NULL, + .fsync = hostfs_fsync, +}; + +static struct file_operations hostfs_dir_fops = { + .readdir = hostfs_readdir, + .read = generic_read_dir, +}; + +int hostfs_writepage(struct page *page, struct writeback_control *wbc) +{ + struct address_space *mapping = page->mapping; + struct inode *inode = mapping->host; + char *buffer; + unsigned long long base; + int count = PAGE_CACHE_SIZE; + int end_index = inode->i_size >> PAGE_CACHE_SHIFT; + int err; + + if (page->index >= end_index) + count = inode->i_size & (PAGE_CACHE_SIZE-1); + + buffer = kmap(page); + base = ((unsigned long long) page->index) << PAGE_CACHE_SHIFT; + + err = write_file(HOSTFS_I(inode)->fd, &base, buffer, count); + if(err != count){ + ClearPageUptodate(page); + goto out; + } + + if (base > inode->i_size) + inode->i_size = base; + + if (PageError(page)) + ClearPageError(page); + err = 0; + + out: + kunmap(page); + + unlock_page(page); + return err; +} + +int hostfs_readpage(struct file *file, struct page *page) +{ + char *buffer; + long long start; + int err = 0; + + start = (long long) page->index << PAGE_CACHE_SHIFT; + buffer = kmap(page); + err = read_file(FILE_HOSTFS_I(file)->fd, &start, buffer, + PAGE_CACHE_SIZE); + if(err < 0) goto out; + + memset(&buffer[err], 0, PAGE_CACHE_SIZE - err); + + flush_dcache_page(page); + SetPageUptodate(page); + if (PageError(page)) ClearPageError(page); + err = 0; + out: + kunmap(page); + unlock_page(page); + return(err); +} + +int hostfs_prepare_write(struct file *file, struct page *page, + unsigned int from, unsigned int to) +{ + char *buffer; + long long start, tmp; + int err; + + start = (long long) page->index << PAGE_CACHE_SHIFT; + buffer = kmap(page); + if(from != 0){ + tmp = start; + err = read_file(FILE_HOSTFS_I(file)->fd, &tmp, buffer, + from); + if(err < 0) goto out; + } + if(to != PAGE_CACHE_SIZE){ + start += to; + err = read_file(FILE_HOSTFS_I(file)->fd, &start, buffer + to, + PAGE_CACHE_SIZE - to); + if(err < 0) goto out; + } + err = 0; + out: + kunmap(page); + return(err); +} + +int hostfs_commit_write(struct file *file, struct page *page, unsigned from, + unsigned to) +{ + struct address_space *mapping = page->mapping; + struct inode *inode = mapping->host; + char *buffer; + long long start; + int err = 0; + + start = (long long) (page->index << PAGE_CACHE_SHIFT) + from; + buffer = kmap(page); + err = write_file(FILE_HOSTFS_I(file)->fd, &start, buffer + from, + to - from); + if(err > 0) err = 0; + if(!err && (start > inode->i_size)) + inode->i_size = start; + + kunmap(page); + return(err); +} + +static struct address_space_operations hostfs_aops = { + .writepage = hostfs_writepage, + .readpage = hostfs_readpage, +/* .set_page_dirty = __set_page_dirty_nobuffers, */ + .prepare_write = hostfs_prepare_write, + .commit_write = hostfs_commit_write +}; + +static int init_inode(struct inode *inode, struct dentry *dentry) +{ + char *name; + int type, err = -ENOMEM, rdev; + + if(dentry){ + name = dentry_name(dentry, 0); + if(name == NULL) + goto out; + type = file_type(name, &rdev); + kfree(name); + } + else type = OS_TYPE_DIR; + + err = 0; + if(type == OS_TYPE_SYMLINK) + inode->i_op = &page_symlink_inode_operations; + else if(type == OS_TYPE_DIR) + inode->i_op = &hostfs_dir_iops; + else inode->i_op = &hostfs_iops; + + if(type == OS_TYPE_DIR) inode->i_fop = &hostfs_dir_fops; + else inode->i_fop = &hostfs_file_fops; + + if(type == OS_TYPE_SYMLINK) + inode->i_mapping->a_ops = &hostfs_link_aops; + else inode->i_mapping->a_ops = &hostfs_aops; + + switch (type) { + case OS_TYPE_CHARDEV: + init_special_inode(inode, S_IFCHR, rdev); + break; + case OS_TYPE_BLOCKDEV: + init_special_inode(inode, S_IFBLK, rdev); + break; + case OS_TYPE_FIFO: + init_special_inode(inode, S_IFIFO, 0); + break; + case OS_TYPE_SOCK: + init_special_inode(inode, S_IFSOCK, 0); + break; + } + out: + return(err); +} + +int hostfs_create(struct inode *dir, struct dentry *dentry, int mode, + struct nameidata *nd) +{ + struct inode *inode; + char *name; + int error, fd; + + error = -ENOMEM; + inode = iget(dir->i_sb, 0); + if(inode == NULL) goto out; + + error = init_inode(inode, dentry); + if(error) + goto out_put; + + error = -ENOMEM; + name = dentry_name(dentry, 0); + if(name == NULL) + goto out_put; + + fd = file_create(name, + mode & S_IRUSR, mode & S_IWUSR, mode & S_IXUSR, + mode & S_IRGRP, mode & S_IWGRP, mode & S_IXGRP, + mode & S_IROTH, mode & S_IWOTH, mode & S_IXOTH); + if(fd < 0) + error = fd; + else error = read_name(inode, name); + + kfree(name); + if(error) + goto out_put; + + HOSTFS_I(inode)->fd = fd; + HOSTFS_I(inode)->mode = FMODE_READ | FMODE_WRITE; + d_instantiate(dentry, inode); + return(0); + + out_put: + iput(inode); + out: + return(error); +} + +struct dentry *hostfs_lookup(struct inode *ino, struct dentry *dentry, + struct nameidata *nd) +{ + struct inode *inode; + char *name; + int err; + + err = -ENOMEM; + inode = iget(ino->i_sb, 0); + if(inode == NULL) + goto out; + + err = init_inode(inode, dentry); + if(err) + goto out_put; + + err = -ENOMEM; + name = dentry_name(dentry, 0); + if(name == NULL) + goto out_put; + + err = read_name(inode, name); + kfree(name); + if(err == -ENOENT){ + iput(inode); + inode = NULL; + } + else if(err) + goto out_put; + + d_add(dentry, inode); + dentry->d_op = &hostfs_dentry_ops; + return(NULL); + + out_put: + iput(inode); + out: + return(ERR_PTR(err)); +} + +static char *inode_dentry_name(struct inode *ino, struct dentry *dentry) +{ + char *file; + int len; + + file = inode_name(ino, dentry->d_name.len + 1); + if(file == NULL) return(NULL); + strcat(file, "/"); + len = strlen(file); + strncat(file, dentry->d_name.name, dentry->d_name.len); + file[len + dentry->d_name.len] = '\0'; + return(file); +} + +int hostfs_link(struct dentry *to, struct inode *ino, struct dentry *from) +{ + char *from_name, *to_name; + int err; + + if((from_name = inode_dentry_name(ino, from)) == NULL) + return(-ENOMEM); + to_name = dentry_name(to, 0); + if(to_name == NULL){ + kfree(from_name); + return(-ENOMEM); + } + err = link_file(to_name, from_name); + kfree(from_name); + kfree(to_name); + return(err); +} + +int hostfs_unlink(struct inode *ino, struct dentry *dentry) +{ + char *file; + int err; + + if((file = inode_dentry_name(ino, dentry)) == NULL) return(-ENOMEM); + if(append) + return(-EPERM); + + err = unlink_file(file); + kfree(file); + return(err); +} + +int hostfs_symlink(struct inode *ino, struct dentry *dentry, const char *to) +{ + char *file; + int err; + + if((file = inode_dentry_name(ino, dentry)) == NULL) return(-ENOMEM); + err = make_symlink(file, to); + kfree(file); + return(err); +} + +int hostfs_mkdir(struct inode *ino, struct dentry *dentry, int mode) +{ + char *file; + int err; + + if((file = inode_dentry_name(ino, dentry)) == NULL) return(-ENOMEM); + err = do_mkdir(file, mode); + kfree(file); + return(err); +} + +int hostfs_rmdir(struct inode *ino, struct dentry *dentry) +{ + char *file; + int err; + + if((file = inode_dentry_name(ino, dentry)) == NULL) return(-ENOMEM); + err = do_rmdir(file); + kfree(file); + return(err); +} + +int hostfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev) +{ + struct inode *inode; + char *name; + int err = -ENOMEM; + + inode = iget(dir->i_sb, 0); + if(inode == NULL) + goto out; + + err = init_inode(inode, dentry); + if(err) + goto out_put; + + err = -ENOMEM; + name = dentry_name(dentry, 0); + if(name == NULL) + goto out_put; + + init_special_inode(inode, mode, dev); + err = do_mknod(name, mode, dev); + if(err) + goto out_free; + + err = read_name(inode, name); + kfree(name); + if(err) + goto out_put; + + d_instantiate(dentry, inode); + return(0); + + out_free: + kfree(name); + out_put: + iput(inode); + out: + return(err); +} + +int hostfs_rename(struct inode *from_ino, struct dentry *from, + struct inode *to_ino, struct dentry *to) +{ + char *from_name, *to_name; + int err; + + if((from_name = inode_dentry_name(from_ino, from)) == NULL) + return(-ENOMEM); + if((to_name = inode_dentry_name(to_ino, to)) == NULL){ + kfree(from_name); + return(-ENOMEM); + } + err = rename_file(from_name, to_name); + kfree(from_name); + kfree(to_name); + return(err); +} + +void hostfs_truncate(struct inode *ino) +{ + not_implemented(); +} + +int hostfs_permission(struct inode *ino, int desired, struct nameidata *nd) +{ + char *name; + int r = 0, w = 0, x = 0, err; + + if(desired & MAY_READ) r = 1; + if(desired & MAY_WRITE) w = 1; + if(desired & MAY_EXEC) x = 1; + name = inode_name(ino, 0); + if(name == NULL) return(-ENOMEM); + err = access_file(name, r, w, x); + kfree(name); + if(!err) err = vfs_permission(ino, desired); + return(err); +} + +int hostfs_setattr(struct dentry *dentry, struct iattr *attr) +{ + struct hostfs_iattr attrs; + char *name; + int err; + + if(append) + attr->ia_valid &= ~ATTR_SIZE; + + attrs.ia_valid = 0; + if(attr->ia_valid & ATTR_MODE){ + attrs.ia_valid |= HOSTFS_ATTR_MODE; + attrs.ia_mode = attr->ia_mode; + } + if(attr->ia_valid & ATTR_UID){ + if((dentry->d_inode->i_sb->s_dev == ROOT_DEV) && + (attr->ia_uid == 0)) + attr->ia_uid = getuid(); + attrs.ia_valid |= HOSTFS_ATTR_UID; + attrs.ia_uid = attr->ia_uid; + } + if(attr->ia_valid & ATTR_GID){ + if((dentry->d_inode->i_sb->s_dev == ROOT_DEV) && + (attr->ia_gid == 0)) + attr->ia_gid = getuid(); + attrs.ia_valid |= HOSTFS_ATTR_GID; + attrs.ia_gid = attr->ia_gid; + } + if(attr->ia_valid & ATTR_SIZE){ + attrs.ia_valid |= HOSTFS_ATTR_SIZE; + attrs.ia_size = attr->ia_size; + } + if(attr->ia_valid & ATTR_ATIME){ + attrs.ia_valid |= HOSTFS_ATTR_ATIME; + attrs.ia_atime = attr->ia_atime; + } + if(attr->ia_valid & ATTR_MTIME){ + attrs.ia_valid |= HOSTFS_ATTR_MTIME; + attrs.ia_mtime = attr->ia_mtime; + } + if(attr->ia_valid & ATTR_CTIME){ + attrs.ia_valid |= HOSTFS_ATTR_CTIME; + attrs.ia_ctime = attr->ia_ctime; + } + if(attr->ia_valid & ATTR_ATIME_SET){ + attrs.ia_valid |= HOSTFS_ATTR_ATIME_SET; + } + if(attr->ia_valid & ATTR_MTIME_SET){ + attrs.ia_valid |= HOSTFS_ATTR_MTIME_SET; + } + name = dentry_name(dentry, 0); + if(name == NULL) return(-ENOMEM); + err = set_attr(name, &attrs); + kfree(name); + if(err) + return(err); + + return(inode_setattr(dentry->d_inode, attr)); +} + +int hostfs_getattr(struct vfsmount *mnt, struct dentry *dentry, + struct kstat *stat) +{ + generic_fillattr(dentry->d_inode, stat); + return(0); +} + +static struct inode_operations hostfs_iops = { + .create = hostfs_create, + .link = hostfs_link, + .unlink = hostfs_unlink, + .symlink = hostfs_symlink, + .mkdir = hostfs_mkdir, + .rmdir = hostfs_rmdir, + .mknod = hostfs_mknod, + .rename = hostfs_rename, + .truncate = hostfs_truncate, + .permission = hostfs_permission, + .setattr = hostfs_setattr, + .getattr = hostfs_getattr, +}; + +static struct inode_operations hostfs_dir_iops = { + .create = hostfs_create, + .lookup = hostfs_lookup, + .link = hostfs_link, + .unlink = hostfs_unlink, + .symlink = hostfs_symlink, + .mkdir = hostfs_mkdir, + .rmdir = hostfs_rmdir, + .mknod = hostfs_mknod, + .rename = hostfs_rename, + .truncate = hostfs_truncate, + .permission = hostfs_permission, + .setattr = hostfs_setattr, + .getattr = hostfs_getattr, +}; + +int hostfs_link_readpage(struct file *file, struct page *page) +{ + char *buffer, *name; + long long start; + int err; + + start = page->index << PAGE_CACHE_SHIFT; + buffer = kmap(page); + name = inode_name(page->mapping->host, 0); + if(name == NULL) return(-ENOMEM); + err = do_readlink(name, buffer, PAGE_CACHE_SIZE); + kfree(name); + if(err == PAGE_CACHE_SIZE) + err = -E2BIG; + else if(err > 0){ + flush_dcache_page(page); + SetPageUptodate(page); + if (PageError(page)) ClearPageError(page); + err = 0; + } + kunmap(page); + unlock_page(page); + return(err); +} + +static struct address_space_operations hostfs_link_aops = { + .readpage = hostfs_link_readpage, +}; + +static int hostfs_fill_sb_common(struct super_block *sb, void *d, int silent) +{ + struct inode *root_inode; + char *name, *data = d; + int err; + + sb->s_blocksize = 1024; + sb->s_blocksize_bits = 10; + sb->s_magic = HOSTFS_SUPER_MAGIC; + sb->s_op = &hostfs_sbops; + + if((data == NULL) || (*data == '\0')) + data = root_ino; + + err = -ENOMEM; + name = kmalloc(strlen(data) + 1, GFP_KERNEL); + if(name == NULL) + goto out; + + strcpy(name, data); + + root_inode = iget(sb, 0); + if(root_inode == NULL) + goto out_free; + + err = init_inode(root_inode, NULL); + if(err) + goto out_put; + + HOSTFS_I(root_inode)->host_filename = name; + + err = -ENOMEM; + sb->s_root = d_alloc_root(root_inode); + if(sb->s_root == NULL) + goto out_put; + + err = read_inode(root_inode); + if(err) + goto out_put; + + return(0); + + out_put: + iput(root_inode); + out_free: + kfree(name); + out: + return(err); +} + +static struct super_block *hostfs_read_sb(struct file_system_type *type, + int flags, const char *dev_name, + void *data) +{ + return(get_sb_nodev(type, flags, data, hostfs_fill_sb_common)); +} + +static struct file_system_type hostfs_type = { + .owner = THIS_MODULE, + .name = "hostfs", + .get_sb = hostfs_read_sb, + .kill_sb = kill_anon_super, + .fs_flags = 0, +}; + +static int __init init_hostfs(void) +{ + return(register_filesystem(&hostfs_type)); +} + +static void __exit exit_hostfs(void) +{ + unregister_filesystem(&hostfs_type); +} + +module_init(init_hostfs) +module_exit(exit_hostfs) +MODULE_LICENSE("GPL"); + +/* + * Overrides for Emacs so that we follow Linus's tabbing style. + * Emacs will notice this stuff at the end of the file and automatically + * adjust the settings for this buffer only. This must remain at the end + * of the file. + * --------------------------------------------------------------------------- + * Local variables: + * c-file-style: "linux" + * End: + */ diff --git a/fs/hostfs/hostfs_user.c b/fs/hostfs/hostfs_user.c new file mode 100644 index 000000000..c40626609 --- /dev/null +++ b/fs/hostfs/hostfs_user.c @@ -0,0 +1,361 @@ +/* + * Copyright (C) 2000 Jeff Dike (jdike@karaya.com) + * Licensed under the GPL + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include "hostfs.h" +#include "kern_util.h" +#include "user.h" + +int stat_file(const char *path, unsigned long long *inode_out, int *mode_out, + int *nlink_out, int *uid_out, int *gid_out, + unsigned long long *size_out, struct timespec *atime_out, + struct timespec *mtime_out, struct timespec *ctime_out, + int *blksize_out, unsigned long long *blocks_out) +{ + struct stat64 buf; + + if(lstat64(path, &buf) < 0) + return(-errno); + + /* See the Makefile for why STAT64_INO_FIELD is passed in + * by the build + */ + if(inode_out != NULL) *inode_out = buf.STAT64_INO_FIELD; + if(mode_out != NULL) *mode_out = buf.st_mode; + if(nlink_out != NULL) *nlink_out = buf.st_nlink; + if(uid_out != NULL) *uid_out = buf.st_uid; + if(gid_out != NULL) *gid_out = buf.st_gid; + if(size_out != NULL) *size_out = buf.st_size; + if(atime_out != NULL) { + atime_out->tv_sec = buf.st_atime; + atime_out->tv_nsec = 0; + } + if(mtime_out != NULL) { + mtime_out->tv_sec = buf.st_mtime; + mtime_out->tv_nsec = 0; + } + if(ctime_out != NULL) { + ctime_out->tv_sec = buf.st_ctime; + ctime_out->tv_nsec = 0; + } + if(blksize_out != NULL) *blksize_out = buf.st_blksize; + if(blocks_out != NULL) *blocks_out = buf.st_blocks; + return(0); +} + +int file_type(const char *path, int *rdev) +{ + struct stat64 buf; + + if(lstat64(path, &buf) < 0) + return(-errno); + if(rdev != NULL) + *rdev = buf.st_rdev; + + if(S_ISDIR(buf.st_mode)) return(OS_TYPE_DIR); + else if(S_ISLNK(buf.st_mode)) return(OS_TYPE_SYMLINK); + else if(S_ISCHR(buf.st_mode)) return(OS_TYPE_CHARDEV); + else if(S_ISBLK(buf.st_mode)) return(OS_TYPE_BLOCKDEV); + else if(S_ISFIFO(buf.st_mode))return(OS_TYPE_FIFO); + else if(S_ISSOCK(buf.st_mode))return(OS_TYPE_SOCK); + else return(OS_TYPE_FILE); +} + +int access_file(char *path, int r, int w, int x) +{ + int mode = 0; + + if(r) mode = R_OK; + if(w) mode |= W_OK; + if(x) mode |= X_OK; + if(access(path, mode) != 0) return(-errno); + else return(0); +} + +int open_file(char *path, int r, int w, int append) +{ + int mode = 0, fd; + + if(r && !w) + mode = O_RDONLY; + else if(!r && w) + mode = O_WRONLY; + else if(r && w) + mode = O_RDWR; + else panic("Impossible mode in open_file"); + + if(append) + mode |= O_APPEND; + fd = open64(path, mode); + if(fd < 0) return(-errno); + else return(fd); +} + +void *open_dir(char *path, int *err_out) +{ + DIR *dir; + + dir = opendir(path); + *err_out = errno; + if(dir == NULL) return(NULL); + return(dir); +} + +char *read_dir(void *stream, unsigned long long *pos, + unsigned long long *ino_out, int *len_out) +{ + DIR *dir = stream; + struct dirent *ent; + + seekdir(dir, *pos); + ent = readdir(dir); + if(ent == NULL) return(NULL); + *len_out = strlen(ent->d_name); + *ino_out = ent->d_ino; + *pos = telldir(dir); + return(ent->d_name); +} + +int read_file(int fd, unsigned long long *offset, char *buf, int len) +{ + int n; + + n = pread64(fd, buf, len, *offset); + if(n < 0) return(-errno); + *offset += n; + return(n); +} + +int write_file(int fd, unsigned long long *offset, const char *buf, int len) +{ + int n; + + n = pwrite64(fd, buf, len, *offset); + if(n < 0) return(-errno); + *offset += n; + return(n); +} + +int lseek_file(int fd, long long offset, int whence) +{ + int ret; + + ret = lseek64(fd, offset, whence); + if(ret < 0) return(-errno); + return(0); +} + +void close_file(void *stream) +{ + close(*((int *) stream)); +} + +void close_dir(void *stream) +{ + closedir(stream); +} + +int file_create(char *name, int ur, int uw, int ux, int gr, + int gw, int gx, int or, int ow, int ox) +{ + int mode, fd; + + mode = 0; + mode |= ur ? S_IRUSR : 0; + mode |= uw ? S_IWUSR : 0; + mode |= ux ? S_IXUSR : 0; + mode |= gr ? S_IRGRP : 0; + mode |= gw ? S_IWGRP : 0; + mode |= gx ? S_IXGRP : 0; + mode |= or ? S_IROTH : 0; + mode |= ow ? S_IWOTH : 0; + mode |= ox ? S_IXOTH : 0; + fd = open64(name, O_CREAT | O_RDWR, mode); + if(fd < 0) + return(-errno); + return(fd); +} + +int set_attr(const char *file, struct hostfs_iattr *attrs) +{ + struct utimbuf buf; + int err, ma; + + if(attrs->ia_valid & HOSTFS_ATTR_MODE){ + if(chmod(file, attrs->ia_mode) != 0) return(-errno); + } + if(attrs->ia_valid & HOSTFS_ATTR_UID){ + if(chown(file, attrs->ia_uid, -1)) return(-errno); + } + if(attrs->ia_valid & HOSTFS_ATTR_GID){ + if(chown(file, -1, attrs->ia_gid)) return(-errno); + } + if(attrs->ia_valid & HOSTFS_ATTR_SIZE){ + if(truncate(file, attrs->ia_size)) return(-errno); + } + ma = HOSTFS_ATTR_ATIME_SET | HOSTFS_ATTR_MTIME_SET; + if((attrs->ia_valid & ma) == ma){ + buf.actime = attrs->ia_atime.tv_sec; + buf.modtime = attrs->ia_mtime.tv_sec; + if(utime(file, &buf) != 0) return(-errno); + } + else { + struct timespec ts; + + if(attrs->ia_valid & HOSTFS_ATTR_ATIME_SET){ + err = stat_file(file, NULL, NULL, NULL, NULL, NULL, + NULL, NULL, &ts, NULL, NULL, NULL); + if(err != 0) + return(err); + buf.actime = attrs->ia_atime.tv_sec; + buf.modtime = ts.tv_sec; + if(utime(file, &buf) != 0) + return(-errno); + } + if(attrs->ia_valid & HOSTFS_ATTR_MTIME_SET){ + err = stat_file(file, NULL, NULL, NULL, NULL, NULL, + NULL, &ts, NULL, NULL, NULL, NULL); + if(err != 0) + return(err); + buf.actime = ts.tv_sec; + buf.modtime = attrs->ia_mtime.tv_sec; + if(utime(file, &buf) != 0) + return(-errno); + } + } + if(attrs->ia_valid & HOSTFS_ATTR_CTIME) ; + if(attrs->ia_valid & (HOSTFS_ATTR_ATIME | HOSTFS_ATTR_MTIME)){ + err = stat_file(file, NULL, NULL, NULL, NULL, NULL, NULL, + &attrs->ia_atime, &attrs->ia_mtime, NULL, + NULL, NULL); + if(err != 0) return(err); + } + return(0); +} + +int make_symlink(const char *from, const char *to) +{ + int err; + + err = symlink(to, from); + if(err) return(-errno); + return(0); +} + +int unlink_file(const char *file) +{ + int err; + + err = unlink(file); + if(err) return(-errno); + return(0); +} + +int do_mkdir(const char *file, int mode) +{ + int err; + + err = mkdir(file, mode); + if(err) return(-errno); + return(0); +} + +int do_rmdir(const char *file) +{ + int err; + + err = rmdir(file); + if(err) return(-errno); + return(0); +} + +int do_mknod(const char *file, int mode, int dev) +{ + int err; + + err = mknod(file, mode, dev); + if(err) return(-errno); + return(0); +} + +int link_file(const char *to, const char *from) +{ + int err; + + err = link(to, from); + if(err) return(-errno); + return(0); +} + +int do_readlink(char *file, char *buf, int size) +{ + int n; + + n = readlink(file, buf, size); + if(n < 0) + return(-errno); + if(n < size) + buf[n] = '\0'; + return(n); +} + +int rename_file(char *from, char *to) +{ + int err; + + err = rename(from, to); + if(err < 0) return(-errno); + return(0); +} + +int do_statfs(char *root, long *bsize_out, long long *blocks_out, + long long *bfree_out, long long *bavail_out, + long long *files_out, long long *ffree_out, + void *fsid_out, int fsid_size, long *namelen_out, + long *spare_out) +{ + struct statfs64 buf; + int err; + + err = statfs64(root, &buf); + if(err < 0) return(-errno); + *bsize_out = buf.f_bsize; + *blocks_out = buf.f_blocks; + *bfree_out = buf.f_bfree; + *bavail_out = buf.f_bavail; + *files_out = buf.f_files; + *ffree_out = buf.f_ffree; + memcpy(fsid_out, &buf.f_fsid, + sizeof(buf.f_fsid) > fsid_size ? fsid_size : + sizeof(buf.f_fsid)); + *namelen_out = buf.f_namelen; + spare_out[0] = buf.f_spare[0]; + spare_out[1] = buf.f_spare[1]; + spare_out[2] = buf.f_spare[2]; + spare_out[3] = buf.f_spare[3]; + spare_out[4] = buf.f_spare[4]; + spare_out[5] = buf.f_spare[5]; + return(0); +} + +/* + * Overrides for Emacs so that we follow Linus's tabbing style. + * Emacs will notice this stuff at the end of the file and automatically + * adjust the settings for this buffer only. This must remain at the end + * of the file. + * --------------------------------------------------------------------------- + * Local variables: + * c-file-style: "linux" + * End: + */ diff --git a/fs/hppfs/Makefile b/fs/hppfs/Makefile new file mode 100644 index 000000000..e67f03848 --- /dev/null +++ b/fs/hppfs/Makefile @@ -0,0 +1,19 @@ +# +# Copyright (C) 2002, 2003 Jeff Dike (jdike@karaya.com) +# Licensed under the GPL +# + +hppfs-objs := hppfs_kern.o + +obj-y = +obj-$(CONFIG_HPPFS) += hppfs.o + +clean: + +modules: + +fastdep: + +dep: + +archmrproper: clean diff --git a/fs/hppfs/hppfs_kern.c b/fs/hppfs/hppfs_kern.c new file mode 100644 index 000000000..ebf08cb55 --- /dev/null +++ b/fs/hppfs/hppfs_kern.c @@ -0,0 +1,811 @@ +/* + * Copyright (C) 2002 Jeff Dike (jdike@karaya.com) + * Licensed under the GPL + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include "os.h" + +static int init_inode(struct inode *inode, struct dentry *dentry); + +struct hppfs_data { + struct list_head list; + char contents[PAGE_SIZE - sizeof(struct list_head)]; +}; + +struct hppfs_private { + struct file proc_file; + int host_fd; + loff_t len; + struct hppfs_data *contents; +}; + +struct hppfs_inode_info { + struct dentry *proc_dentry; + struct inode vfs_inode; +}; + +static inline struct hppfs_inode_info *HPPFS_I(struct inode *inode) +{ + return(list_entry(inode, struct hppfs_inode_info, vfs_inode)); +} + +#define HPPFS_SUPER_MAGIC 0xb00000ee + +static struct super_operations hppfs_sbops; + +static int is_pid(struct dentry *dentry) +{ + struct super_block *sb; + int i; + + sb = dentry->d_sb; + if((sb->s_op != &hppfs_sbops) || (dentry->d_parent != sb->s_root)) + return(0); + + for(i = 0; i < dentry->d_name.len; i++){ + if(!isdigit(dentry->d_name.name[i])) + return(0); + } + return(1); +} + +static char *dentry_name(struct dentry *dentry, int extra) +{ + struct dentry *parent; + char *root, *name; + const char *seg_name; + int len, seg_len; + + len = 0; + parent = dentry; + while(parent->d_parent != parent){ + if(is_pid(parent)) + len += strlen("pid") + 1; + else len += parent->d_name.len + 1; + parent = parent->d_parent; + } + + root = "proc"; + len += strlen(root); + name = kmalloc(len + extra + 1, GFP_KERNEL); + if(name == NULL) return(NULL); + + name[len] = '\0'; + parent = dentry; + while(parent->d_parent != parent){ + if(is_pid(parent)){ + seg_name = "pid"; + seg_len = strlen("pid"); + } + else { + seg_name = parent->d_name.name; + seg_len = parent->d_name.len; + } + + len -= seg_len + 1; + name[len] = '/'; + strncpy(&name[len + 1], seg_name, seg_len); + parent = parent->d_parent; + } + strncpy(name, root, strlen(root)); + return(name); +} + +struct dentry_operations hppfs_dentry_ops = { +}; + +static int file_removed(struct dentry *dentry, const char *file) +{ + char *host_file; + int extra, fd; + + extra = 0; + if(file != NULL) extra += strlen(file) + 1; + + host_file = dentry_name(dentry, extra + strlen("/remove")); + if(host_file == NULL){ + printk("file_removed : allocation failed\n"); + return(-ENOMEM); + } + + if(file != NULL){ + strcat(host_file, "/"); + strcat(host_file, file); + } + strcat(host_file, "/remove"); + + fd = os_open_file(host_file, of_read(OPENFLAGS()), 0); + kfree(host_file); + if(fd > 0){ + os_close_file(fd); + return(1); + } + return(0); +} + +static void hppfs_read_inode(struct inode *ino) +{ + struct inode *proc_ino; + + if(HPPFS_I(ino)->proc_dentry == NULL) + return; + + proc_ino = HPPFS_I(ino)->proc_dentry->d_inode; + ino->i_uid = proc_ino->i_uid; + ino->i_gid = proc_ino->i_gid; + ino->i_atime = proc_ino->i_atime; + ino->i_mtime = proc_ino->i_mtime; + ino->i_ctime = proc_ino->i_ctime; + ino->i_ino = proc_ino->i_ino; + ino->i_mode = proc_ino->i_mode; + ino->i_nlink = proc_ino->i_nlink; + ino->i_size = proc_ino->i_size; + ino->i_blksize = proc_ino->i_blksize; + ino->i_blocks = proc_ino->i_blocks; +} + +static struct dentry *hppfs_lookup(struct inode *ino, struct dentry *dentry, + struct nameidata *nd) +{ + struct dentry *proc_dentry, *new, *parent; + struct inode *inode; + int err, deleted; + + deleted = file_removed(dentry, NULL); + if(deleted < 0) + return(ERR_PTR(deleted)); + else if(deleted) + return(ERR_PTR(-ENOENT)); + + err = -ENOMEM; + parent = HPPFS_I(ino)->proc_dentry; + down(&parent->d_inode->i_sem); + proc_dentry = d_lookup(parent, &dentry->d_name); + if(proc_dentry == NULL){ + proc_dentry = d_alloc(parent, &dentry->d_name); + if(proc_dentry == NULL){ + up(&parent->d_inode->i_sem); + goto out; + } + new = (*parent->d_inode->i_op->lookup)(parent->d_inode, + proc_dentry, NULL); + if(new){ + dput(proc_dentry); + proc_dentry = new; + } + } + up(&parent->d_inode->i_sem); + + if(IS_ERR(proc_dentry)) + return(proc_dentry); + + inode = iget(ino->i_sb, 0); + if(inode == NULL) + goto out_dput; + + err = init_inode(inode, proc_dentry); + if(err) + goto out_put; + + hppfs_read_inode(inode); + + d_add(dentry, inode); + dentry->d_op = &hppfs_dentry_ops; + return(NULL); + + out_put: + iput(inode); + out_dput: + dput(proc_dentry); + out: + return(ERR_PTR(err)); +} + +static struct inode_operations hppfs_file_iops = { +}; + +static ssize_t read_proc(struct file *file, char *buf, ssize_t count, + loff_t *ppos, int is_user) +{ + ssize_t (*read)(struct file *, char *, size_t, loff_t *); + ssize_t n; + + read = file->f_dentry->d_inode->i_fop->read; + + if(!is_user) + set_fs(KERNEL_DS); + + n = (*read)(file, buf, count, &file->f_pos); + + if(!is_user) + set_fs(USER_DS); + + if(ppos) *ppos = file->f_pos; + return(n); +} + +static ssize_t hppfs_read_file(int fd, char *buf, ssize_t count) +{ + ssize_t n; + int cur, err; + char *new_buf; + + n = -ENOMEM; + new_buf = kmalloc(PAGE_SIZE, GFP_KERNEL); + if(new_buf == NULL){ + printk("hppfs_read_file : kmalloc failed\n"); + goto out; + } + n = 0; + while(count > 0){ + cur = min_t(ssize_t, count, PAGE_SIZE); + err = os_read_file(fd, new_buf, cur); + if(err < 0){ + printk("hppfs_read : read failed, errno = %d\n", + count); + n = err; + goto out_free; + } + else if(err == 0) + break; + + if(copy_to_user(buf, new_buf, err)){ + n = -EFAULT; + goto out_free; + } + n += err; + count -= err; + } + out_free: + kfree(new_buf); + out: + return(n); +} + +static ssize_t hppfs_read(struct file *file, char *buf, size_t count, + loff_t *ppos) +{ + struct hppfs_private *hppfs = file->private_data; + struct hppfs_data *data; + loff_t off; + int err; + + if(hppfs->contents != NULL){ + if(*ppos >= hppfs->len) return(0); + + data = hppfs->contents; + off = *ppos; + while(off >= sizeof(data->contents)){ + data = list_entry(data->list.next, struct hppfs_data, + list); + off -= sizeof(data->contents); + } + + if(off + count > hppfs->len) + count = hppfs->len - off; + copy_to_user(buf, &data->contents[off], count); + *ppos += count; + } + else if(hppfs->host_fd != -1){ + err = os_seek_file(hppfs->host_fd, *ppos); + if(err){ + printk("hppfs_read : seek failed, errno = %d\n", err); + return(err); + } + count = hppfs_read_file(hppfs->host_fd, buf, count); + if(count > 0) + *ppos += count; + } + else count = read_proc(&hppfs->proc_file, buf, count, ppos, 1); + + return(count); +} + +static ssize_t hppfs_write(struct file *file, const char *buf, size_t len, + loff_t *ppos) +{ + struct hppfs_private *data = file->private_data; + struct file *proc_file = &data->proc_file; + ssize_t (*write)(struct file *, const char *, size_t, loff_t *); + int err; + + write = proc_file->f_dentry->d_inode->i_fop->write; + + proc_file->f_pos = file->f_pos; + err = (*write)(proc_file, buf, len, &proc_file->f_pos); + file->f_pos = proc_file->f_pos; + + return(err); +} + +static int open_host_sock(char *host_file, int *filter_out) +{ + char *end; + int fd; + + end = &host_file[strlen(host_file)]; + strcpy(end, "/rw"); + *filter_out = 1; + fd = os_connect_socket(host_file); + if(fd > 0) + return(fd); + + strcpy(end, "/r"); + *filter_out = 0; + fd = os_connect_socket(host_file); + return(fd); +} + +static void free_contents(struct hppfs_data *head) +{ + struct hppfs_data *data; + struct list_head *ele, *next; + + if(head == NULL) return; + + list_for_each_safe(ele, next, &head->list){ + data = list_entry(ele, struct hppfs_data, list); + kfree(data); + } + kfree(head); +} + +static struct hppfs_data *hppfs_get_data(int fd, int filter, + struct file *proc_file, + struct file *hppfs_file, + loff_t *size_out) +{ + struct hppfs_data *data, *new, *head; + int n, err; + + err = -ENOMEM; + data = kmalloc(sizeof(*data), GFP_KERNEL); + if(data == NULL){ + printk("hppfs_get_data : head allocation failed\n"); + goto failed; + } + + INIT_LIST_HEAD(&data->list); + + head = data; + *size_out = 0; + + if(filter){ + while((n = read_proc(proc_file, data->contents, + sizeof(data->contents), NULL, 0)) > 0) + os_write_file(fd, data->contents, n); + err = os_shutdown_socket(fd, 0, 1); + if(err){ + printk("hppfs_get_data : failed to shut down " + "socket\n"); + goto failed_free; + } + } + while(1){ + n = os_read_file(fd, data->contents, sizeof(data->contents)); + if(n < 0){ + err = n; + printk("hppfs_get_data : read failed, errno = %d\n", + err); + goto failed_free; + } + else if(n == 0) + break; + + *size_out += n; + + if(n < sizeof(data->contents)) + break; + + new = kmalloc(sizeof(*data), GFP_KERNEL); + if(new == 0){ + printk("hppfs_get_data : data allocation failed\n"); + err = -ENOMEM; + goto failed_free; + } + + INIT_LIST_HEAD(&new->list); + list_add(&new->list, &data->list); + data = new; + } + return(head); + + failed_free: + free_contents(head); + failed: + return(ERR_PTR(err)); +} + +static struct hppfs_private *hppfs_data(void) +{ + struct hppfs_private *data; + + data = kmalloc(sizeof(*data), GFP_KERNEL); + if(data == NULL) + return(data); + + *data = ((struct hppfs_private ) { .host_fd = -1, + .len = -1, + .contents = NULL } ); + return(data); +} + +static int file_mode(int fmode) +{ + if(fmode == (FMODE_READ | FMODE_WRITE)) + return(O_RDWR); + if(fmode == FMODE_READ) + return(O_RDONLY); + if(fmode == FMODE_WRITE) + return(O_WRONLY); + return(0); +} + +static int hppfs_open(struct inode *inode, struct file *file) +{ + struct hppfs_private *data; + struct dentry *proc_dentry; + char *host_file; + int err, fd, type, filter; + + err = -ENOMEM; + data = hppfs_data(); + if(data == NULL) + goto out; + + host_file = dentry_name(file->f_dentry, strlen("/rw")); + if(host_file == NULL) + goto out_free2; + + proc_dentry = HPPFS_I(inode)->proc_dentry; + + /* XXX This isn't closed anywhere */ + err = open_private_file(&data->proc_file, proc_dentry, + file_mode(file->f_mode)); + if(err) + goto out_free1; + + type = os_file_type(host_file); + if(type == OS_TYPE_FILE){ + fd = os_open_file(host_file, of_read(OPENFLAGS()), 0); + if(fd >= 0) + data->host_fd = fd; + else printk("hppfs_open : failed to open '%s', errno = %d\n", + host_file, -fd); + + data->contents = NULL; + } + else if(type == OS_TYPE_DIR){ + fd = open_host_sock(host_file, &filter); + if(fd > 0){ + data->contents = hppfs_get_data(fd, filter, + &data->proc_file, + file, &data->len); + if(!IS_ERR(data->contents)) + data->host_fd = fd; + } + else printk("hppfs_open : failed to open a socket in " + "'%s', errno = %d\n", host_file, -fd); + } + kfree(host_file); + + file->private_data = data; + return(0); + + out_free1: + kfree(host_file); + out_free2: + free_contents(data->contents); + kfree(data); + out: + return(err); +} + +static int hppfs_dir_open(struct inode *inode, struct file *file) +{ + struct hppfs_private *data; + struct dentry *proc_dentry; + int err; + + err = -ENOMEM; + data = hppfs_data(); + if(data == NULL) + goto out; + + proc_dentry = HPPFS_I(inode)->proc_dentry; + err = open_private_file(&data->proc_file, proc_dentry, + file_mode(file->f_mode)); + if(err) + goto out_free; + + file->private_data = data; + return(0); + + out_free: + kfree(data); + out: + return(err); +} + +static loff_t hppfs_llseek(struct file *file, loff_t off, int where) +{ + struct hppfs_private *data = file->private_data; + struct file *proc_file = &data->proc_file; + loff_t (*llseek)(struct file *, loff_t, int); + loff_t ret; + + llseek = proc_file->f_dentry->d_inode->i_fop->llseek; + if(llseek != NULL){ + ret = (*llseek)(proc_file, off, where); + if(ret < 0) + return(ret); + } + + return(default_llseek(file, off, where)); +} + +static struct file_operations hppfs_file_fops = { + .owner = NULL, + .llseek = hppfs_llseek, + .read = hppfs_read, + .write = hppfs_write, + .open = hppfs_open, +}; + +struct hppfs_dirent { + void *vfs_dirent; + filldir_t filldir; + struct dentry *dentry; +}; + +static int hppfs_filldir(void *d, const char *name, int size, + loff_t offset, ino_t inode, unsigned int type) +{ + struct hppfs_dirent *dirent = d; + + if(file_removed(dirent->dentry, name)) + return(0); + + return((*dirent->filldir)(dirent->vfs_dirent, name, size, offset, + inode, type)); +} + +static int hppfs_readdir(struct file *file, void *ent, filldir_t filldir) +{ + struct hppfs_private *data = file->private_data; + struct file *proc_file = &data->proc_file; + int (*readdir)(struct file *, void *, filldir_t); + struct hppfs_dirent dirent = ((struct hppfs_dirent) + { .vfs_dirent = ent, + .filldir = filldir, + .dentry = file->f_dentry } ); + int err; + + readdir = proc_file->f_dentry->d_inode->i_fop->readdir; + + proc_file->f_pos = file->f_pos; + err = (*readdir)(proc_file, &dirent, hppfs_filldir); + file->f_pos = proc_file->f_pos; + + return(err); +} + +static int hppfs_fsync(struct file *file, struct dentry *dentry, int datasync) +{ + return(0); +} + +static struct file_operations hppfs_dir_fops = { + .owner = NULL, + .readdir = hppfs_readdir, + .open = hppfs_dir_open, + .fsync = hppfs_fsync, +}; + +static int hppfs_statfs(struct super_block *sb, struct kstatfs *sf) +{ + sf->f_blocks = 0; + sf->f_bfree = 0; + sf->f_bavail = 0; + sf->f_files = 0; + sf->f_ffree = 0; + sf->f_type = HPPFS_SUPER_MAGIC; + return(0); +} + +static struct inode *hppfs_alloc_inode(struct super_block *sb) +{ + struct hppfs_inode_info *hi; + + hi = kmalloc(sizeof(*hi), GFP_KERNEL); + if(hi == NULL) + return(NULL); + + *hi = ((struct hppfs_inode_info) { .proc_dentry = NULL }); + inode_init_once(&hi->vfs_inode); + return(&hi->vfs_inode); +} + +void hppfs_delete_inode(struct inode *ino) +{ + clear_inode(ino); +} + +static void hppfs_destroy_inode(struct inode *inode) +{ + kfree(HPPFS_I(inode)); +} + +static struct super_operations hppfs_sbops = { + .alloc_inode = hppfs_alloc_inode, + .destroy_inode = hppfs_destroy_inode, + .read_inode = hppfs_read_inode, + .delete_inode = hppfs_delete_inode, + .statfs = hppfs_statfs, +}; + +static int hppfs_readlink(struct dentry *dentry, char *buffer, int buflen) +{ + struct file proc_file; + struct dentry *proc_dentry; + int (*readlink)(struct dentry *, char *, int); + int err, n; + + proc_dentry = HPPFS_I(dentry->d_inode)->proc_dentry; + err = open_private_file(&proc_file, proc_dentry, O_RDONLY); + if(err) + return(err); + + readlink = proc_dentry->d_inode->i_op->readlink; + n = (*readlink)(proc_dentry, buffer, buflen); + + close_private_file(&proc_file); + + return(n); +} + +static int hppfs_follow_link(struct dentry *dentry, struct nameidata *nd) +{ + struct file proc_file; + struct dentry *proc_dentry; + int (*follow_link)(struct dentry *, struct nameidata *); + int err, n; + + proc_dentry = HPPFS_I(dentry->d_inode)->proc_dentry; + err = open_private_file(&proc_file, proc_dentry, O_RDONLY); + if(err) + return(err); + + follow_link = proc_dentry->d_inode->i_op->follow_link; + n = (*follow_link)(proc_dentry, nd); + + close_private_file(&proc_file); + + return(n); +} + +static struct inode_operations hppfs_dir_iops = { + .lookup = hppfs_lookup, +}; + +static struct inode_operations hppfs_link_iops = { + .readlink = hppfs_readlink, + .follow_link = hppfs_follow_link, +}; + +static int init_inode(struct inode *inode, struct dentry *dentry) +{ + if(S_ISDIR(dentry->d_inode->i_mode)){ + inode->i_op = &hppfs_dir_iops; + inode->i_fop = &hppfs_dir_fops; + } + else if(S_ISLNK(dentry->d_inode->i_mode)){ + inode->i_op = &hppfs_link_iops; + inode->i_fop = &hppfs_file_fops; + } + else { + inode->i_op = &hppfs_file_iops; + inode->i_fop = &hppfs_file_fops; + } + + HPPFS_I(inode)->proc_dentry = dentry; + + return(0); +} + +static int hppfs_fill_super(struct super_block *sb, void *d, int silent) +{ + struct inode *root_inode; + struct file_system_type *procfs; + struct super_block *proc_sb; + int err; + + err = -ENOENT; + procfs = get_fs_type("proc"); + if(procfs == NULL) + goto out; + + if(list_empty(&procfs->fs_supers)) + goto out; + + proc_sb = list_entry(procfs->fs_supers.next, struct super_block, + s_instances); + + sb->s_blocksize = 1024; + sb->s_blocksize_bits = 10; + sb->s_magic = HPPFS_SUPER_MAGIC; + sb->s_op = &hppfs_sbops; + + root_inode = iget(sb, 0); + if(root_inode == NULL) + goto out; + + err = init_inode(root_inode, proc_sb->s_root); + if(err) + goto out_put; + + err = -ENOMEM; + sb->s_root = d_alloc_root(root_inode); + if(sb->s_root == NULL) + goto out_put; + + hppfs_read_inode(root_inode); + + return(0); + + out_put: + iput(root_inode); + out: + return(err); +} + +static struct super_block *hppfs_read_super(struct file_system_type *type, + int flags, const char *dev_name, + void *data) +{ + return(get_sb_nodev(type, flags, data, hppfs_fill_super)); +} + +static struct file_system_type hppfs_type = { + .owner = THIS_MODULE, + .name = "hppfs", + .get_sb = hppfs_read_super, + .kill_sb = kill_anon_super, + .fs_flags = 0, +}; + +static int __init init_hppfs(void) +{ + return(register_filesystem(&hppfs_type)); +} + +static void __exit exit_hppfs(void) +{ + unregister_filesystem(&hppfs_type); +} + +module_init(init_hppfs) +module_exit(exit_hppfs) +MODULE_LICENSE("GPL"); + +/* + * Overrides for Emacs so that we follow Linus's tabbing style. + * Emacs will notice this stuff at the end of the file and automatically + * adjust the settings for this buffer only. This must remain at the end + * of the file. + * --------------------------------------------------------------------------- + * Local variables: + * c-file-style: "linux" + * End: + */ diff --git a/include/asm-um/cpufeature.h b/include/asm-um/cpufeature.h new file mode 100644 index 000000000..fb7bd42a4 --- /dev/null +++ b/include/asm-um/cpufeature.h @@ -0,0 +1,6 @@ +#ifndef __UM_CPUFEATURE_H +#define __UM_CPUFEATURE_H + +#include "asm/arch/cpufeature.h" + +#endif diff --git a/include/asm-um/local.h b/include/asm-um/local.h new file mode 100644 index 000000000..9a280c5bb --- /dev/null +++ b/include/asm-um/local.h @@ -0,0 +1,6 @@ +#ifndef __UM_LOCAL_H +#define __UM_LOCAL_H + +#include "asm/arch/local.h" + +#endif diff --git a/include/asm-um/module-generic.h b/include/asm-um/module-generic.h new file mode 100644 index 000000000..5a265f56b --- /dev/null +++ b/include/asm-um/module-generic.h @@ -0,0 +1,6 @@ +#ifndef __UM_MODULE_GENERIC_H +#define __UM_MODULE_GENERIC_H + +#include "asm/arch/module.h" + +#endif diff --git a/include/asm-um/sections.h b/include/asm-um/sections.h new file mode 100644 index 000000000..6b0231eef --- /dev/null +++ b/include/asm-um/sections.h @@ -0,0 +1,7 @@ +#ifndef _UM_SECTIONS_H +#define _UM_SECTIONS_H + +/* nothing to see, move along */ +#include + +#endif diff --git a/include/linux/ghash.h b/include/linux/ghash.h new file mode 100644 index 000000000..a24798866 --- /dev/null +++ b/include/linux/ghash.h @@ -0,0 +1,236 @@ +/* + * include/linux/ghash.h -- generic hashing with fuzzy retrieval + * + * (C) 1997 Thomas Schoebel-Theuer + * + * The algorithms implemented here seem to be a completely new invention, + * and I'll publish the fundamentals in a paper. + */ + +#ifndef _GHASH_H +#define _GHASH_H +/* HASHSIZE _must_ be a power of two!!! */ + + +#define DEF_HASH_FUZZY_STRUCTS(NAME,HASHSIZE,TYPE) \ +\ +struct NAME##_table {\ + TYPE * hashtable[HASHSIZE];\ + TYPE * sorted_list;\ + int nr_entries;\ +};\ +\ +struct NAME##_ptrs {\ + TYPE * next_hash;\ + TYPE * prev_hash;\ + TYPE * next_sorted;\ + TYPE * prev_sorted;\ +}; + +#define DEF_HASH_FUZZY(LINKAGE,NAME,HASHSIZE,TYPE,PTRS,KEYTYPE,KEY,KEYCMP,KEYEQ,HASHFN)\ +\ +LINKAGE void insert_##NAME##_hash(struct NAME##_table * tbl, TYPE * elem)\ +{\ + int ix = HASHFN(elem->KEY);\ + TYPE ** base = &tbl->hashtable[ix];\ + TYPE * ptr = *base;\ + TYPE * prev = NULL;\ +\ + tbl->nr_entries++;\ + while(ptr && KEYCMP(ptr->KEY, elem->KEY)) {\ + base = &ptr->PTRS.next_hash;\ + prev = ptr;\ + ptr = *base;\ + }\ + elem->PTRS.next_hash = ptr;\ + elem->PTRS.prev_hash = prev;\ + if(ptr) {\ + ptr->PTRS.prev_hash = elem;\ + }\ + *base = elem;\ +\ + ptr = prev;\ + if(!ptr) {\ + ptr = tbl->sorted_list;\ + prev = NULL;\ + } else {\ + prev = ptr->PTRS.prev_sorted;\ + }\ + while(ptr) {\ + TYPE * next = ptr->PTRS.next_hash;\ + if(next && KEYCMP(next->KEY, elem->KEY)) {\ + prev = ptr;\ + ptr = next;\ + } else if(KEYCMP(ptr->KEY, elem->KEY)) {\ + prev = ptr;\ + ptr = ptr->PTRS.next_sorted;\ + } else\ + break;\ + }\ + elem->PTRS.next_sorted = ptr;\ + elem->PTRS.prev_sorted = prev;\ + if(ptr) {\ + ptr->PTRS.prev_sorted = elem;\ + }\ + if(prev) {\ + prev->PTRS.next_sorted = elem;\ + } else {\ + tbl->sorted_list = elem;\ + }\ +}\ +\ +LINKAGE void remove_##NAME##_hash(struct NAME##_table * tbl, TYPE * elem)\ +{\ + TYPE * next = elem->PTRS.next_hash;\ + TYPE * prev = elem->PTRS.prev_hash;\ +\ + tbl->nr_entries--;\ + if(next)\ + next->PTRS.prev_hash = prev;\ + if(prev)\ + prev->PTRS.next_hash = next;\ + else {\ + int ix = HASHFN(elem->KEY);\ + tbl->hashtable[ix] = next;\ + }\ +\ + next = elem->PTRS.next_sorted;\ + prev = elem->PTRS.prev_sorted;\ + if(next)\ + next->PTRS.prev_sorted = prev;\ + if(prev)\ + prev->PTRS.next_sorted = next;\ + else\ + tbl->sorted_list = next;\ +}\ +\ +LINKAGE TYPE * find_##NAME##_hash(struct NAME##_table * tbl, KEYTYPE pos)\ +{\ + int ix = hashfn(pos);\ + TYPE * ptr = tbl->hashtable[ix];\ + while(ptr && KEYCMP(ptr->KEY, pos))\ + ptr = ptr->PTRS.next_hash;\ + if(ptr && !KEYEQ(ptr->KEY, pos))\ + ptr = NULL;\ + return ptr;\ +}\ +\ +LINKAGE TYPE * find_##NAME##_hash_fuzzy(struct NAME##_table * tbl, KEYTYPE pos)\ +{\ + int ix;\ + int offset;\ + TYPE * ptr;\ + TYPE * next;\ +\ + ptr = tbl->sorted_list;\ + if(!ptr || KEYCMP(pos, ptr->KEY))\ + return NULL;\ + ix = HASHFN(pos);\ + offset = HASHSIZE;\ + do {\ + offset >>= 1;\ + next = tbl->hashtable[(ix+offset) & ((HASHSIZE)-1)];\ + if(next && (KEYCMP(next->KEY, pos) || KEYEQ(next->KEY, pos))\ + && KEYCMP(ptr->KEY, next->KEY))\ + ptr = next;\ + } while(offset);\ +\ + for(;;) {\ + next = ptr->PTRS.next_hash;\ + if(next) {\ + if(KEYCMP(next->KEY, pos)) {\ + ptr = next;\ + continue;\ + }\ + }\ + next = ptr->PTRS.next_sorted;\ + if(next && KEYCMP(next->KEY, pos)) {\ + ptr = next;\ + continue;\ + }\ + return ptr;\ + }\ + return NULL;\ +} + +/* LINKAGE - empty or "static", depending on whether you want the definitions to + * be public or not + * NAME - a string to stick in names to make this hash table type distinct from + * any others + * HASHSIZE - number of buckets + * TYPE - type of data contained in the buckets - must be a structure, one + * field is of type NAME_ptrs, another is the hash key + * PTRS - TYPE must contain a field of type NAME_ptrs, PTRS is the name of that + * field + * KEYTYPE - type of the key field within TYPE + * KEY - name of the key field within TYPE + * KEYCMP - pointer to function that compares KEYTYPEs to each other - the + * prototype is int KEYCMP(KEYTYPE, KEYTYPE), it returns zero for equal, + * non-zero for not equal + * HASHFN - the hash function - the prototype is int HASHFN(KEYTYPE), + * it returns a number in the range 0 ... HASHSIZE - 1 + * Call DEF_HASH_STRUCTS, define your hash table as a NAME_table, then call + * DEF_HASH. + */ + +#define DEF_HASH_STRUCTS(NAME,HASHSIZE,TYPE) \ +\ +struct NAME##_table {\ + TYPE * hashtable[HASHSIZE];\ + int nr_entries;\ +};\ +\ +struct NAME##_ptrs {\ + TYPE * next_hash;\ + TYPE * prev_hash;\ +}; + +#define DEF_HASH(LINKAGE,NAME,TYPE,PTRS,KEYTYPE,KEY,KEYCMP,HASHFN)\ +\ +LINKAGE void insert_##NAME##_hash(struct NAME##_table * tbl, TYPE * elem)\ +{\ + int ix = HASHFN(elem->KEY);\ + TYPE ** base = &tbl->hashtable[ix];\ + TYPE * ptr = *base;\ + TYPE * prev = NULL;\ +\ + tbl->nr_entries++;\ + while(ptr && KEYCMP(ptr->KEY, elem->KEY)) {\ + base = &ptr->PTRS.next_hash;\ + prev = ptr;\ + ptr = *base;\ + }\ + elem->PTRS.next_hash = ptr;\ + elem->PTRS.prev_hash = prev;\ + if(ptr) {\ + ptr->PTRS.prev_hash = elem;\ + }\ + *base = elem;\ +}\ +\ +LINKAGE void remove_##NAME##_hash(struct NAME##_table * tbl, TYPE * elem)\ +{\ + TYPE * next = elem->PTRS.next_hash;\ + TYPE * prev = elem->PTRS.prev_hash;\ +\ + tbl->nr_entries--;\ + if(next)\ + next->PTRS.prev_hash = prev;\ + if(prev)\ + prev->PTRS.next_hash = next;\ + else {\ + int ix = HASHFN(elem->KEY);\ + tbl->hashtable[ix] = next;\ + }\ +}\ +\ +LINKAGE TYPE * find_##NAME##_hash(struct NAME##_table * tbl, KEYTYPE pos)\ +{\ + int ix = HASHFN(pos);\ + TYPE * ptr = tbl->hashtable[ix];\ + while(ptr && KEYCMP(ptr->KEY, pos))\ + ptr = ptr->PTRS.next_hash;\ + return ptr;\ +} + +#endif diff --git a/include/linux/proc_mm.h b/include/linux/proc_mm.h new file mode 100644 index 000000000..254f8b4b8 --- /dev/null +++ b/include/linux/proc_mm.h @@ -0,0 +1,48 @@ +/* + * Copyright (C) 2002 Jeff Dike (jdike@karaya.com) + * Licensed under the GPL + */ + +#ifndef __PROC_MM_H +#define __PROC_MM_H + +#include "linux/sched.h" + +#define MM_MMAP 54 +#define MM_MUNMAP 55 +#define MM_MPROTECT 56 +#define MM_COPY_SEGMENTS 57 + +struct mm_mmap { + unsigned long addr; + unsigned long len; + unsigned long prot; + unsigned long flags; + unsigned long fd; + unsigned long offset; +}; + +struct mm_munmap { + unsigned long addr; + unsigned long len; +}; + +struct mm_mprotect { + unsigned long addr; + unsigned long len; + unsigned int prot; +}; + +struct proc_mm_op { + int op; + union { + struct mm_mmap mmap; + struct mm_munmap munmap; + struct mm_mprotect mprotect; + int copy_segments; + } u; +}; + +extern struct mm_struct *proc_mm_get_mm(int fd); + +#endif diff --git a/mm/proc_mm.c b/mm/proc_mm.c new file mode 100644 index 000000000..5ceb506af --- /dev/null +++ b/mm/proc_mm.c @@ -0,0 +1,174 @@ +/* + * Copyright (C) 2002 Jeff Dike (jdike@karaya.com) + * Licensed under the GPL + */ + +#include "linux/mm.h" +#include "linux/init.h" +#include "linux/proc_fs.h" +#include "linux/proc_mm.h" +#include "linux/file.h" +#include "asm/uaccess.h" +#include "asm/mmu_context.h" + +static struct file_operations proc_mm_fops; + +struct mm_struct *proc_mm_get_mm(int fd) +{ + struct mm_struct *ret = ERR_PTR(-EBADF); + struct file *file; + + file = fget(fd); + if (!file) + goto out; + + ret = ERR_PTR(-EINVAL); + if(file->f_op != &proc_mm_fops) + goto out_fput; + + ret = file->private_data; + out_fput: + fput(file); + out: + return(ret); +} + +extern long do_mmap2(struct mm_struct *mm, unsigned long addr, + unsigned long len, unsigned long prot, + unsigned long flags, unsigned long fd, + unsigned long pgoff); + +static ssize_t write_proc_mm(struct file *file, const char *buffer, + size_t count, loff_t *ppos) +{ + struct mm_struct *mm = file->private_data; + struct proc_mm_op req; + int n, ret; + + if(count > sizeof(req)) + return(-EINVAL); + + n = copy_from_user(&req, buffer, count); + if(n != 0) + return(-EFAULT); + + ret = count; + switch(req.op){ + case MM_MMAP: { + struct mm_mmap *map = &req.u.mmap; + + ret = do_mmap2(mm, map->addr, map->len, map->prot, + map->flags, map->fd, map->offset >> PAGE_SHIFT); + if((ret & ~PAGE_MASK) == 0) + ret = count; + + break; + } + case MM_MUNMAP: { + struct mm_munmap *unmap = &req.u.munmap; + + down_write(&mm->mmap_sem); + ret = do_munmap(mm, unmap->addr, unmap->len); + up_write(&mm->mmap_sem); + + if(ret == 0) + ret = count; + break; + } + case MM_MPROTECT: { + struct mm_mprotect *protect = &req.u.mprotect; + + ret = do_mprotect(mm, protect->addr, protect->len, + protect->prot); + if(ret == 0) + ret = count; + break; + } + + case MM_COPY_SEGMENTS: { + struct mm_struct *from = proc_mm_get_mm(req.u.copy_segments); + + if(IS_ERR(from)){ + ret = PTR_ERR(from); + break; + } + + mm_copy_segments(from, mm); + break; + } + default: + ret = -EINVAL; + break; + } + + return(ret); +} + +static int open_proc_mm(struct inode *inode, struct file *file) +{ + struct mm_struct *mm = mm_alloc(); + int ret; + + ret = -ENOMEM; + if(mm == NULL) + goto out_mem; + + ret = init_new_context(current, mm); + if(ret) + goto out_free; + + spin_lock(&mmlist_lock); + list_add(&mm->mmlist, ¤t->mm->mmlist); + mmlist_nr++; + spin_unlock(&mmlist_lock); + + file->private_data = mm; + + return(0); + + out_free: + mmput(mm); + out_mem: + return(ret); +} + +static int release_proc_mm(struct inode *inode, struct file *file) +{ + struct mm_struct *mm = file->private_data; + + mmput(mm); + return(0); +} + +static struct file_operations proc_mm_fops = { + .open = open_proc_mm, + .release = release_proc_mm, + .write = write_proc_mm, +}; + +static int make_proc_mm(void) +{ + struct proc_dir_entry *ent; + + ent = create_proc_entry("mm", 0222, &proc_root); + if(ent == NULL){ + printk("make_proc_mm : Failed to register /proc/mm\n"); + return(0); + } + ent->proc_fops = &proc_mm_fops; + + return(0); +} + +__initcall(make_proc_mm); + +/* + * Overrides for Emacs so that we follow Linus's tabbing style. + * Emacs will notice this stuff at the end of the file and automatically + * adjust the settings for this buffer only. This must remain at the end + * of the file. + * --------------------------------------------------------------------------- + * Local variables: + * c-file-style: "linux" + * End: + */ -- 2.47.0