#include <linux/cramfs_fs_sb.h>
#include <linux/buffer_head.h>
#include <linux/vfs.h>
+#include <linux/mutex.h>
#include <asm/semaphore.h>
#include <asm/uaccess.h>
static struct super_operations cramfs_ops;
static struct inode_operations cramfs_dir_inode_operations;
-static struct file_operations cramfs_directory_operations;
+static const struct file_operations cramfs_directory_operations;
static struct address_space_operations cramfs_aops;
-static DECLARE_MUTEX(read_mutex);
+static DEFINE_MUTEX(read_mutex);
/* These two macros may change in future, to provide better st_ino
semantics. */
-#define CRAMINO(x) ((x)->offset?(x)->offset<<2:1)
+#define CRAMINO(x) (((x)->offset && (x)->size)?(x)->offset<<2:1)
#define OFFSET(x) ((x)->i_ino)
-static struct inode *get_cramfs_inode(struct super_block *sb, struct cramfs_inode * cramfs_inode)
+
+static int cramfs_iget5_test(struct inode *inode, void *opaque)
+{
+ struct cramfs_inode *cramfs_inode = opaque;
+
+ if (inode->i_ino != CRAMINO(cramfs_inode))
+ return 0; /* does not match */
+
+ if (inode->i_ino != 1)
+ return 1;
+
+ /* all empty directories, char, block, pipe, and sock, share inode #1 */
+
+ if ((inode->i_mode != cramfs_inode->mode) ||
+ (inode->i_gid != cramfs_inode->gid) ||
+ (inode->i_uid != cramfs_inode->uid))
+ return 0; /* does not match */
+
+ if ((S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) &&
+ (inode->i_rdev != old_decode_dev(cramfs_inode->size)))
+ return 0; /* does not match */
+
+ return 1; /* matches */
+}
+
+static int cramfs_iget5_set(struct inode *inode, void *opaque)
{
- struct inode * inode = new_inode(sb);
static struct timespec zerotime;
+ struct cramfs_inode *cramfs_inode = opaque;
+ inode->i_mode = cramfs_inode->mode;
+ inode->i_uid = cramfs_inode->uid;
+ inode->i_size = cramfs_inode->size;
+ inode->i_blocks = (cramfs_inode->size - 1) / 512 + 1;
+ inode->i_blksize = PAGE_CACHE_SIZE;
+ inode->i_gid = cramfs_inode->gid;
+ /* Struct copy intentional */
+ inode->i_mtime = inode->i_atime = inode->i_ctime = zerotime;
+ inode->i_ino = CRAMINO(cramfs_inode);
+ /* inode->i_nlink is left 1 - arguably wrong for directories,
+ but it's the best we can do without reading the directory
+ contents. 1 yields the right result in GNU find, even
+ without -noleaf option. */
+ if (S_ISREG(inode->i_mode)) {
+ inode->i_fop = &generic_ro_fops;
+ inode->i_data.a_ops = &cramfs_aops;
+ } else if (S_ISDIR(inode->i_mode)) {
+ inode->i_op = &cramfs_dir_inode_operations;
+ inode->i_fop = &cramfs_directory_operations;
+ } else if (S_ISLNK(inode->i_mode)) {
+ inode->i_op = &page_symlink_inode_operations;
+ inode->i_data.a_ops = &cramfs_aops;
+ } else {
+ inode->i_size = 0;
+ inode->i_blocks = 0;
+ init_special_inode(inode, inode->i_mode,
+ old_decode_dev(cramfs_inode->size));
+ }
+ return 0;
+}
- if (inode) {
- inode->i_mode = cramfs_inode->mode;
- inode->i_uid = cramfs_inode->uid;
- inode->i_size = cramfs_inode->size;
- inode->i_blocks = (cramfs_inode->size - 1) / 512 + 1;
- inode->i_blksize = PAGE_CACHE_SIZE;
- inode->i_gid = cramfs_inode->gid;
- /* Struct copy intentional */
- inode->i_mtime = inode->i_atime = inode->i_ctime = zerotime;
- inode->i_ino = CRAMINO(cramfs_inode);
- /* inode->i_nlink is left 1 - arguably wrong for directories,
- but it's the best we can do without reading the directory
- contents. 1 yields the right result in GNU find, even
- without -noleaf option. */
- insert_inode_hash(inode);
- if (S_ISREG(inode->i_mode)) {
- inode->i_fop = &generic_ro_fops;
- inode->i_data.a_ops = &cramfs_aops;
- } else if (S_ISDIR(inode->i_mode)) {
- inode->i_op = &cramfs_dir_inode_operations;
- inode->i_fop = &cramfs_directory_operations;
- } else if (S_ISLNK(inode->i_mode)) {
- inode->i_op = &page_symlink_inode_operations;
- inode->i_data.a_ops = &cramfs_aops;
- } else {
- inode->i_size = 0;
- inode->i_blocks = 0;
- init_special_inode(inode, inode->i_mode,
- old_decode_dev(cramfs_inode->size));
- }
+static struct inode *get_cramfs_inode(struct super_block *sb,
+ struct cramfs_inode * cramfs_inode)
+{
+ struct inode *inode = iget5_locked(sb, CRAMINO(cramfs_inode),
+ cramfs_iget5_test, cramfs_iget5_set,
+ cramfs_inode);
+ if (inode && (inode->i_state & I_NEW)) {
+ unlock_new_inode(inode);
}
return inode;
}
memset(sbi, 0, sizeof(struct cramfs_sb_info));
/* Invalidate the read buffers on mount: think disk change.. */
- down(&read_mutex);
+ mutex_lock(&read_mutex);
for (i = 0; i < READ_BUFFERS; i++)
buffer_blocknr[i] = -1;
/* Read the first block and get the superblock from it */
memcpy(&super, cramfs_read(sb, 0, sizeof(super)), sizeof(super));
- up(&read_mutex);
+ mutex_unlock(&read_mutex);
/* Do sanity checks on the superblock */
if (super.magic != CRAMFS_MAGIC) {
/* check at 512 byte offset */
- down(&read_mutex);
+ mutex_lock(&read_mutex);
memcpy(&super, cramfs_read(sb, 512, sizeof(super)), sizeof(super));
- up(&read_mutex);
+ mutex_unlock(&read_mutex);
if (super.magic != CRAMFS_MAGIC) {
if (!silent)
printk(KERN_ERR "cramfs: wrong magic\n");
mode_t mode;
int namelen, error;
- down(&read_mutex);
+ mutex_lock(&read_mutex);
de = cramfs_read(sb, OFFSET(inode) + offset, sizeof(*de)+256);
name = (char *)(de+1);
memcpy(buf, name, namelen);
ino = CRAMINO(de);
mode = de->mode;
- up(&read_mutex);
+ mutex_unlock(&read_mutex);
nextoffset = offset + sizeof(*de) + namelen;
for (;;) {
if (!namelen) {
unsigned int offset = 0;
int sorted;
- down(&read_mutex);
+ mutex_lock(&read_mutex);
sorted = CRAMFS_SB(dir->i_sb)->flags & CRAMFS_FLAG_SORTED_DIRS;
while (offset < dir->i_size) {
struct cramfs_inode *de;
for (;;) {
if (!namelen) {
- up(&read_mutex);
+ mutex_unlock(&read_mutex);
return ERR_PTR(-EIO);
}
if (name[namelen-1])
continue;
if (!retval) {
struct cramfs_inode entry = *de;
- up(&read_mutex);
+ mutex_unlock(&read_mutex);
d_add(dentry, get_cramfs_inode(dir->i_sb, &entry));
return NULL;
}
if (sorted)
break;
}
- up(&read_mutex);
+ mutex_unlock(&read_mutex);
d_add(dentry, NULL);
return NULL;
}
u32 start_offset, compr_len;
start_offset = OFFSET(inode) + maxblock*4;
- down(&read_mutex);
+ mutex_lock(&read_mutex);
if (page->index)
start_offset = *(u32 *) cramfs_read(sb, blkptr_offset-4, 4);
compr_len = (*(u32 *) cramfs_read(sb, blkptr_offset, 4) - start_offset);
- up(&read_mutex);
+ mutex_unlock(&read_mutex);
pgdata = kmap(page);
if (compr_len == 0)
; /* hole */
else {
- down(&read_mutex);
+ mutex_lock(&read_mutex);
bytes_filled = cramfs_uncompress_block(pgdata,
PAGE_CACHE_SIZE,
cramfs_read(sb, start_offset, compr_len),
compr_len);
- up(&read_mutex);
+ mutex_unlock(&read_mutex);
}
} else
pgdata = kmap(page);
/*
* A directory can only readdir
*/
-static struct file_operations cramfs_directory_operations = {
+static const struct file_operations cramfs_directory_operations = {
.llseek = generic_file_llseek,
.read = generic_read_dir,
.readdir = cramfs_readdir,
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