* 2000-2001 Christoph Rohland
* 2000-2001 SAP AG
* 2002 Red Hat Inc.
- * Copyright (C) 2002-2003 Hugh Dickins.
- * Copyright (C) 2002-2003 VERITAS Software Corporation.
+ * Copyright (C) 2002-2004 Hugh Dickins.
+ * Copyright (C) 2002-2004 VERITAS Software Corporation.
+ * Copyright (C) 2004 Andi Kleen, SuSE Labs
*
* This file is released under the GPL.
*/
#include <linux/vfs.h>
#include <linux/blkdev.h>
#include <linux/security.h>
+#include <linux/swapops.h>
+#include <linux/mempolicy.h>
+#include <linux/namei.h>
#include <asm/uaccess.h>
#include <asm/div64.h>
+#include <asm/pgtable.h>
/* This magic number is used in glibc for posix shared memory */
-#define TMPFS_MAGIC 0x01021994
#define ENTRIES_PER_PAGE (PAGE_CACHE_SIZE/sizeof(unsigned long))
#define ENTRIES_PER_PAGEPAGE (ENTRIES_PER_PAGE*ENTRIES_PER_PAGE)
}
static swp_entry_t *shmem_swp_map(struct page *page)
+{
+ return (swp_entry_t *)kmap_atomic(page, KM_USER1);
+}
+
+static inline void shmem_swp_balance_unmap(void)
{
/*
- * We have to avoid the unconditional inc_preempt_count()
- * in kmap_atomic(), since shmem_swp_unmap() will also be
- * applied to the low memory addresses within i_direct[].
- * PageHighMem and high_memory tests are good for all arches
- * and configs: highmem_start_page and FIXADDR_START are not.
+ * When passing a pointer to an i_direct entry, to code which
+ * also handles indirect entries and so will shmem_swp_unmap,
+ * we must arrange for the preempt count to remain in balance.
+ * What kmap_atomic of a lowmem page does depends on config
+ * and architecture, so pretend to kmap_atomic some lowmem page.
*/
- return PageHighMem(page)?
- (swp_entry_t *)kmap_atomic(page, KM_USER1):
- (swp_entry_t *)page_address(page);
+ (void) kmap_atomic(ZERO_PAGE(0), KM_USER1);
}
static inline void shmem_swp_unmap(swp_entry_t *entry)
{
- if (entry >= (swp_entry_t *)high_memory)
- kunmap_atomic(entry, KM_USER1);
+ kunmap_atomic(entry, KM_USER1);
}
static inline struct shmem_sb_info *SHMEM_SB(struct super_block *sb)
.unplug_io_fn = default_unplug_io_fn,
};
-LIST_HEAD(shmem_inodes);
-static spinlock_t shmem_ilock = SPIN_LOCK_UNLOCKED;
+static LIST_HEAD(shmem_swaplist);
+static spinlock_t shmem_swaplist_lock = SPIN_LOCK_UNLOCKED;
static void shmem_free_block(struct inode *inode)
{
struct shmem_sb_info *sbinfo = SHMEM_SB(inode->i_sb);
- spin_lock(&sbinfo->stat_lock);
- sbinfo->free_blocks++;
- inode->i_blocks -= BLOCKS_PER_PAGE;
- spin_unlock(&sbinfo->stat_lock);
+ if (sbinfo) {
+ spin_lock(&sbinfo->stat_lock);
+ sbinfo->free_blocks++;
+ inode->i_blocks -= BLOCKS_PER_PAGE;
+ spin_unlock(&sbinfo->stat_lock);
+ }
}
/*
if (freed > 0) {
struct shmem_sb_info *sbinfo = SHMEM_SB(inode->i_sb);
info->alloced -= freed;
- spin_lock(&sbinfo->stat_lock);
- sbinfo->free_blocks += freed;
- inode->i_blocks -= freed*BLOCKS_PER_PAGE;
- spin_unlock(&sbinfo->stat_lock);
shmem_unacct_blocks(info->flags, freed);
+ if (sbinfo) {
+ spin_lock(&sbinfo->stat_lock);
+ sbinfo->free_blocks += freed;
+ inode->i_blocks -= freed*BLOCKS_PER_PAGE;
+ spin_unlock(&sbinfo->stat_lock);
+ }
}
}
struct page **dir;
struct page *subdir;
- if (index < SHMEM_NR_DIRECT)
+ if (index < SHMEM_NR_DIRECT) {
+ shmem_swp_balance_unmap();
return info->i_direct+index;
+ }
if (!info->i_indirect) {
if (page) {
info->i_indirect = *page;
*page = NULL;
}
shmem_dir_unmap(dir);
-
- /*
- * With apologies... caller shmem_swp_alloc passes non-NULL
- * page (though perhaps NULL *page); and now we know that this
- * indirect page has been allocated, we can shortcut the final
- * kmap if we know it contains no swap entries, as is commonly
- * the case: return pointer to a 0 which doesn't need kmapping.
- */
- return (page && !subdir->nr_swapped)?
- (swp_entry_t *)&subdir->nr_swapped:
- shmem_swp_map(subdir) + offset;
+ return shmem_swp_map(subdir) + offset;
}
static void shmem_swp_set(struct shmem_inode_info *info, swp_entry_t *entry, unsigned long value)
struct shmem_sb_info *sbinfo = SHMEM_SB(inode->i_sb);
struct page *page = NULL;
swp_entry_t *entry;
- static const swp_entry_t unswapped = { 0 };
if (sgp != SGP_WRITE &&
((loff_t) index << PAGE_CACHE_SHIFT) >= i_size_read(inode))
while (!(entry = shmem_swp_entry(info, index, &page))) {
if (sgp == SGP_READ)
- return (swp_entry_t *) &unswapped;
+ return shmem_swp_map(ZERO_PAGE(0));
/*
* Test free_blocks against 1 not 0, since we have 1 data
* page (and perhaps indirect index pages) yet to allocate:
* a waste to allocate index if we cannot allocate data.
*/
- spin_lock(&sbinfo->stat_lock);
- if (sbinfo->free_blocks <= 1) {
+ if (sbinfo) {
+ spin_lock(&sbinfo->stat_lock);
+ if (sbinfo->free_blocks <= 1) {
+ spin_unlock(&sbinfo->stat_lock);
+ return ERR_PTR(-ENOSPC);
+ }
+ sbinfo->free_blocks--;
+ inode->i_blocks += BLOCKS_PER_PAGE;
spin_unlock(&sbinfo->stat_lock);
- return ERR_PTR(-ENOSPC);
}
- sbinfo->free_blocks--;
- inode->i_blocks += BLOCKS_PER_PAGE;
- spin_unlock(&sbinfo->stat_lock);
spin_unlock(&info->lock);
page = shmem_dir_alloc(mapping_gfp_mask(inode->i_mapping));
struct shmem_inode_info *info = SHMEM_I(inode);
if (inode->i_op->truncate == shmem_truncate) {
- spin_lock(&shmem_ilock);
- list_del(&info->list);
- spin_unlock(&shmem_ilock);
shmem_unacct_size(info->flags, inode->i_size);
inode->i_size = 0;
shmem_truncate(inode);
+ if (!list_empty(&info->swaplist)) {
+ spin_lock(&shmem_swaplist_lock);
+ list_del_init(&info->swaplist);
+ spin_unlock(&shmem_swaplist_lock);
+ }
+ }
+ if (sbinfo) {
+ BUG_ON(inode->i_blocks);
+ spin_lock(&sbinfo->stat_lock);
+ sbinfo->free_inodes++;
+ spin_unlock(&sbinfo->stat_lock);
}
- BUG_ON(inode->i_blocks);
- spin_lock(&sbinfo->stat_lock);
- sbinfo->free_inodes++;
- spin_unlock(&sbinfo->stat_lock);
clear_inode(inode);
}
if (size > SHMEM_NR_DIRECT)
size = SHMEM_NR_DIRECT;
offset = shmem_find_swp(entry, ptr, ptr+size);
- if (offset >= 0)
+ if (offset >= 0) {
+ shmem_swp_balance_unmap();
goto found;
+ }
if (!info->i_indirect)
goto lost2;
/* we might be racing with shmem_truncate */
*/
int shmem_unuse(swp_entry_t entry, struct page *page)
{
- struct list_head *p;
+ struct list_head *p, *next;
struct shmem_inode_info *info;
int found = 0;
- spin_lock(&shmem_ilock);
- list_for_each(p, &shmem_inodes) {
- info = list_entry(p, struct shmem_inode_info, list);
-
- if (info->swapped && shmem_unuse_inode(info, entry, page)) {
+ spin_lock(&shmem_swaplist_lock);
+ list_for_each_safe(p, next, &shmem_swaplist) {
+ info = list_entry(p, struct shmem_inode_info, swaplist);
+ if (!info->swapped)
+ list_del_init(&info->swaplist);
+ else if (shmem_unuse_inode(info, entry, page)) {
/* move head to start search for next from here */
- list_move_tail(&shmem_inodes, &info->list);
+ list_move_tail(&shmem_swaplist, &info->swaplist);
found = 1;
break;
}
}
- spin_unlock(&shmem_ilock);
+ spin_unlock(&shmem_swaplist_lock);
return found;
}
shmem_swp_set(info, entry, swap.val);
shmem_swp_unmap(entry);
spin_unlock(&info->lock);
+ if (list_empty(&info->swaplist)) {
+ spin_lock(&shmem_swaplist_lock);
+ /* move instead of add in case we're racing */
+ list_move_tail(&info->swaplist, &shmem_swaplist);
+ spin_unlock(&shmem_swaplist_lock);
+ }
unlock_page(page);
return 0;
}
return WRITEPAGE_ACTIVATE; /* Return with the page locked */
}
+#ifdef CONFIG_NUMA
+static struct page *shmem_swapin_async(struct shared_policy *p,
+ swp_entry_t entry, unsigned long idx)
+{
+ struct page *page;
+ struct vm_area_struct pvma;
+
+ /* Create a pseudo vma that just contains the policy */
+ memset(&pvma, 0, sizeof(struct vm_area_struct));
+ pvma.vm_end = PAGE_SIZE;
+ pvma.vm_pgoff = idx;
+ pvma.vm_policy = mpol_shared_policy_lookup(p, idx);
+ page = read_swap_cache_async(entry, &pvma, 0);
+ mpol_free(pvma.vm_policy);
+ return page;
+}
+
+struct page *shmem_swapin(struct shmem_inode_info *info, swp_entry_t entry,
+ unsigned long idx)
+{
+ struct shared_policy *p = &info->policy;
+ int i, num;
+ struct page *page;
+ unsigned long offset;
+
+ num = valid_swaphandles(entry, &offset);
+ for (i = 0; i < num; offset++, i++) {
+ page = shmem_swapin_async(p,
+ swp_entry(swp_type(entry), offset), idx);
+ if (!page)
+ break;
+ page_cache_release(page);
+ }
+ lru_add_drain(); /* Push any new pages onto the LRU now */
+ return shmem_swapin_async(p, entry, idx);
+}
+
+static struct page *
+shmem_alloc_page(unsigned long gfp, struct shmem_inode_info *info,
+ unsigned long idx)
+{
+ struct vm_area_struct pvma;
+ struct page *page;
+
+ memset(&pvma, 0, sizeof(struct vm_area_struct));
+ pvma.vm_policy = mpol_shared_policy_lookup(&info->policy, idx);
+ pvma.vm_pgoff = idx;
+ pvma.vm_end = PAGE_SIZE;
+ page = alloc_page_vma(gfp, &pvma, 0);
+ mpol_free(pvma.vm_policy);
+ return page;
+}
+#else
+static inline struct page *
+shmem_swapin(struct shmem_inode_info *info,swp_entry_t entry,unsigned long idx)
+{
+ swapin_readahead(entry, 0, NULL);
+ return read_swap_cache_async(entry, NULL, 0);
+}
+
+static inline struct page *
+shmem_alloc_page(unsigned long gfp,struct shmem_inode_info *info,
+ unsigned long idx)
+{
+ return alloc_page(gfp);
+}
+#endif
+
/*
* shmem_getpage - either get the page from swap or allocate a new one
*
* vm. If we swap it in we mark it dirty since we also free the swap
* entry since a page cannot live in both the swap and page cache
*/
-static int shmem_getpage(struct inode *inode, unsigned long idx, struct page **pagep, enum sgp_type sgp, int *type)
+static int shmem_getpage(struct inode *inode, unsigned long idx,
+ struct page **pagep, enum sgp_type sgp, int *type)
{
struct address_space *mapping = inode->i_mapping;
struct shmem_inode_info *info = SHMEM_I(inode);
struct page *swappage;
swp_entry_t *entry;
swp_entry_t swap;
- int error, majmin = VM_FAULT_MINOR;
+ int error;
if (idx >= SHMEM_MAX_INDEX)
return -EFBIG;
shmem_swp_unmap(entry);
spin_unlock(&info->lock);
/* here we actually do the io */
- if (majmin == VM_FAULT_MINOR && type)
+ if (type && *type == VM_FAULT_MINOR) {
inc_page_state(pgmajfault);
- majmin = VM_FAULT_MAJOR;
- swapin_readahead(swap);
- swappage = read_swap_cache_async(swap);
+ *type = VM_FAULT_MAJOR;
+ }
+ swappage = shmem_swapin(info, swap, idx);
if (!swappage) {
spin_lock(&info->lock);
entry = shmem_swp_alloc(info, idx, sgp);
} else {
shmem_swp_unmap(entry);
sbinfo = SHMEM_SB(inode->i_sb);
- spin_lock(&sbinfo->stat_lock);
- if (sbinfo->free_blocks == 0 || shmem_acct_block(info->flags)) {
+ if (sbinfo) {
+ spin_lock(&sbinfo->stat_lock);
+ if (sbinfo->free_blocks == 0 ||
+ shmem_acct_block(info->flags)) {
+ spin_unlock(&sbinfo->stat_lock);
+ spin_unlock(&info->lock);
+ error = -ENOSPC;
+ goto failed;
+ }
+ sbinfo->free_blocks--;
+ inode->i_blocks += BLOCKS_PER_PAGE;
spin_unlock(&sbinfo->stat_lock);
+ } else if (shmem_acct_block(info->flags)) {
spin_unlock(&info->lock);
error = -ENOSPC;
goto failed;
}
- sbinfo->free_blocks--;
- inode->i_blocks += BLOCKS_PER_PAGE;
- spin_unlock(&sbinfo->stat_lock);
if (!filepage) {
spin_unlock(&info->lock);
- filepage = page_cache_alloc(mapping);
+ filepage = shmem_alloc_page(mapping_gfp_mask(mapping),
+ info,
+ idx);
if (!filepage) {
shmem_unacct_blocks(info->flags, 1);
shmem_free_block(inode);
SetPageUptodate(filepage);
}
done:
- if (!*pagep) {
- if (filepage) {
- unlock_page(filepage);
- *pagep = filepage;
- } else
- *pagep = ZERO_PAGE(0);
+ if (*pagep != filepage) {
+ unlock_page(filepage);
+ *pagep = filepage;
}
- if (type)
- *type = majmin;
return 0;
failed:
return err;
}
} else if (nonblock) {
- /*
- * If a nonlinear mapping then store the file page
- * offset in the pte.
- */
- if (pgoff != linear_page_index(vma, addr)) {
- err = install_file_pte(mm, vma, addr, pgoff, prot);
- if (err)
- return err;
- }
+ err = install_file_pte(mm, vma, addr, pgoff, prot);
+ if (err)
+ return err;
}
len -= PAGE_SIZE;
return 0;
}
-void shmem_lock(struct file *file, int lock)
+#ifdef CONFIG_NUMA
+int shmem_set_policy(struct vm_area_struct *vma, struct mempolicy *new)
+{
+ struct inode *i = vma->vm_file->f_dentry->d_inode;
+ return mpol_set_shared_policy(&SHMEM_I(i)->policy, vma, new);
+}
+
+struct mempolicy *
+shmem_get_policy(struct vm_area_struct *vma, unsigned long addr)
+{
+ struct inode *i = vma->vm_file->f_dentry->d_inode;
+ unsigned long idx;
+
+ idx = ((addr - vma->vm_start) >> PAGE_SHIFT) + vma->vm_pgoff;
+ return mpol_shared_policy_lookup(&SHMEM_I(i)->policy, idx);
+}
+#endif
+
+int shmem_lock(struct file *file, int lock, struct user_struct *user)
{
struct inode *inode = file->f_dentry->d_inode;
struct shmem_inode_info *info = SHMEM_I(inode);
+ int retval = -ENOMEM;
spin_lock(&info->lock);
- if (lock)
+ if (lock && !(info->flags & VM_LOCKED)) {
+ if (!user_shm_lock(inode->i_size, user))
+ goto out_nomem;
info->flags |= VM_LOCKED;
- else
+ }
+ if (!lock && (info->flags & VM_LOCKED) && user) {
+ user_shm_unlock(inode->i_size, user);
info->flags &= ~VM_LOCKED;
+ }
+ retval = 0;
+out_nomem:
spin_unlock(&info->lock);
+ return retval;
}
static int shmem_mmap(struct file *file, struct vm_area_struct *vma)
struct shmem_inode_info *info;
struct shmem_sb_info *sbinfo = SHMEM_SB(sb);
- spin_lock(&sbinfo->stat_lock);
- if (!sbinfo->free_inodes) {
+ if (sbinfo) {
+ spin_lock(&sbinfo->stat_lock);
+ if (!sbinfo->free_inodes) {
+ spin_unlock(&sbinfo->stat_lock);
+ return NULL;
+ }
+ sbinfo->free_inodes--;
spin_unlock(&sbinfo->stat_lock);
- return NULL;
}
- sbinfo->free_inodes--;
- spin_unlock(&sbinfo->stat_lock);
inode = new_inode(sb);
if (inode) {
info = SHMEM_I(inode);
memset(info, 0, (char *)inode - (char *)info);
spin_lock_init(&info->lock);
+ mpol_shared_policy_init(&info->policy);
+ INIT_LIST_HEAD(&info->swaplist);
+
switch (mode & S_IFMT) {
default:
init_special_inode(inode, mode, dev);
case S_IFREG:
inode->i_op = &shmem_inode_operations;
inode->i_fop = &shmem_file_operations;
- spin_lock(&shmem_ilock);
- list_add_tail(&info->list, &shmem_inodes);
- spin_unlock(&shmem_ilock);
break;
case S_IFDIR:
inode->i_nlink++;
return inode;
}
-static int shmem_set_size(struct shmem_sb_info *info,
+#ifdef CONFIG_TMPFS
+
+static int shmem_set_size(struct shmem_sb_info *sbinfo,
unsigned long max_blocks, unsigned long max_inodes)
{
int error;
unsigned long blocks, inodes;
- spin_lock(&info->stat_lock);
- blocks = info->max_blocks - info->free_blocks;
- inodes = info->max_inodes - info->free_inodes;
+ spin_lock(&sbinfo->stat_lock);
+ blocks = sbinfo->max_blocks - sbinfo->free_blocks;
+ inodes = sbinfo->max_inodes - sbinfo->free_inodes;
error = -EINVAL;
if (max_blocks < blocks)
goto out;
if (max_inodes < inodes)
goto out;
error = 0;
- info->max_blocks = max_blocks;
- info->free_blocks = max_blocks - blocks;
- info->max_inodes = max_inodes;
- info->free_inodes = max_inodes - inodes;
+ sbinfo->max_blocks = max_blocks;
+ sbinfo->free_blocks = max_blocks - blocks;
+ sbinfo->max_inodes = max_inodes;
+ sbinfo->free_inodes = max_inodes - inodes;
out:
- spin_unlock(&info->stat_lock);
+ spin_unlock(&sbinfo->stat_lock);
return error;
}
-#ifdef CONFIG_TMPFS
-
static struct inode_operations shmem_symlink_inode_operations;
static struct inode_operations shmem_symlink_inline_operations;
struct inode *inode = file->f_dentry->d_inode;
loff_t pos;
unsigned long written;
- int err;
+ ssize_t err;
if ((ssize_t) count < 0)
return -EINVAL;
__get_user(dummy, buf + bytes - 1);
kaddr = kmap_atomic(page, KM_USER0);
- left = __copy_from_user(kaddr + offset, buf, bytes);
+ left = __copy_from_user_inatomic(kaddr + offset,
+ buf, bytes);
kunmap_atomic(kaddr, KM_USER0);
}
if (left) {
if (index == end_index) {
nr = i_size & ~PAGE_CACHE_MASK;
if (nr <= offset) {
- page_cache_release(page);
+ if (page)
+ page_cache_release(page);
break;
}
}
nr -= offset;
- if (page != ZERO_PAGE(0)) {
+ if (page) {
/*
* If users can be writing to this page using arbitrary
* virtual addresses, take care about potential aliasing
*/
if (!offset)
mark_page_accessed(page);
- }
+ } else
+ page = ZERO_PAGE(0);
/*
* Ok, we have the page, and it's up-to-date, so
desc.written = 0;
desc.count = count;
- desc.buf = buf;
+ desc.arg.buf = buf;
desc.error = 0;
do_shmem_file_read(filp, ppos, &desc, file_read_actor);
}
static ssize_t shmem_file_sendfile(struct file *in_file, loff_t *ppos,
- size_t count, read_actor_t actor, void __user *target)
+ size_t count, read_actor_t actor, void *target)
{
read_descriptor_t desc;
desc.written = 0;
desc.count = count;
- desc.buf = target;
+ desc.arg.data = target;
desc.error = 0;
do_shmem_file_read(in_file, ppos, &desc, actor);
{
struct shmem_sb_info *sbinfo = SHMEM_SB(sb);
- buf->f_type = TMPFS_MAGIC;
+ buf->f_type = TMPFS_SUPER_MAGIC;
buf->f_bsize = PAGE_CACHE_SIZE;
- spin_lock(&sbinfo->stat_lock);
- buf->f_blocks = sbinfo->max_blocks;
- buf->f_bavail = buf->f_bfree = sbinfo->free_blocks;
- buf->f_files = sbinfo->max_inodes;
- buf->f_ffree = sbinfo->free_inodes;
- spin_unlock(&sbinfo->stat_lock);
buf->f_namelen = NAME_MAX;
+ if (sbinfo) {
+ spin_lock(&sbinfo->stat_lock);
+ buf->f_blocks = sbinfo->max_blocks;
+ buf->f_bavail = buf->f_bfree = sbinfo->free_blocks;
+ buf->f_files = sbinfo->max_inodes;
+ buf->f_ffree = sbinfo->free_inodes;
+ spin_unlock(&sbinfo->stat_lock);
+ }
+ /* else leave those fields 0 like simple_statfs */
return 0;
}
static int shmem_link(struct dentry *old_dentry, struct inode *dir, struct dentry *dentry)
{
struct inode *inode = old_dentry->d_inode;
+ struct shmem_sb_info *sbinfo = SHMEM_SB(inode->i_sb);
+
+ /*
+ * No ordinary (disk based) filesystem counts links as inodes;
+ * but each new link needs a new dentry, pinning lowmem, and
+ * tmpfs dentries cannot be pruned until they are unlinked.
+ */
+ if (sbinfo) {
+ spin_lock(&sbinfo->stat_lock);
+ if (!sbinfo->free_inodes) {
+ spin_unlock(&sbinfo->stat_lock);
+ return -ENOSPC;
+ }
+ sbinfo->free_inodes--;
+ spin_unlock(&sbinfo->stat_lock);
+ }
dir->i_size += BOGO_DIRENT_SIZE;
inode->i_ctime = dir->i_ctime = dir->i_mtime = CURRENT_TIME;
{
struct inode *inode = dentry->d_inode;
+ if (inode->i_nlink > 1 && !S_ISDIR(inode->i_mode)) {
+ struct shmem_sb_info *sbinfo = SHMEM_SB(inode->i_sb);
+ if (sbinfo) {
+ spin_lock(&sbinfo->stat_lock);
+ sbinfo->free_inodes++;
+ spin_unlock(&sbinfo->stat_lock);
+ }
+ }
+
dir->i_size -= BOGO_DIRENT_SIZE;
inode->i_ctime = dir->i_ctime = dir->i_mtime = CURRENT_TIME;
inode->i_nlink--;
return error;
}
inode->i_op = &shmem_symlink_inode_operations;
- spin_lock(&shmem_ilock);
- list_add_tail(&info->list, &shmem_inodes);
- spin_unlock(&shmem_ilock);
kaddr = kmap_atomic(page, KM_USER0);
memcpy(kaddr, symname, len);
kunmap_atomic(kaddr, KM_USER0);
return 0;
}
-static int shmem_readlink_inline(struct dentry *dentry, char __user *buffer, int buflen)
-{
- return vfs_readlink(dentry, buffer, buflen, (const char *)SHMEM_I(dentry->d_inode));
-}
-
static int shmem_follow_link_inline(struct dentry *dentry, struct nameidata *nd)
{
- return vfs_follow_link(nd, (const char *)SHMEM_I(dentry->d_inode));
+ nd_set_link(nd, (char *)SHMEM_I(dentry->d_inode));
+ return 0;
}
-static int shmem_readlink(struct dentry *dentry, char __user *buffer, int buflen)
+static int shmem_follow_link(struct dentry *dentry, struct nameidata *nd)
{
struct page *page = NULL;
int res = shmem_getpage(dentry->d_inode, 0, &page, SGP_READ, NULL);
- if (res)
- return res;
- res = vfs_readlink(dentry, buffer, buflen, kmap(page));
- kunmap(page);
- mark_page_accessed(page);
- page_cache_release(page);
- return res;
+ nd_set_link(nd, res ? ERR_PTR(res) : kmap(page));
+ return 0;
}
-static int shmem_follow_link(struct dentry *dentry, struct nameidata *nd)
+static void shmem_put_link(struct dentry *dentry, struct nameidata *nd)
{
- struct page *page = NULL;
- int res = shmem_getpage(dentry->d_inode, 0, &page, SGP_READ, NULL);
- if (res)
- return res;
- res = vfs_follow_link(nd, kmap(page));
- kunmap(page);
- mark_page_accessed(page);
- page_cache_release(page);
- return res;
+ if (!IS_ERR(nd_get_link(nd))) {
+ struct page *page;
+
+ page = find_get_page(dentry->d_inode->i_mapping, 0);
+ if (!page)
+ BUG();
+ kunmap(page);
+ mark_page_accessed(page);
+ page_cache_release(page);
+ page_cache_release(page);
+ }
}
static struct inode_operations shmem_symlink_inline_operations = {
- .readlink = shmem_readlink_inline,
+ .readlink = generic_readlink,
.follow_link = shmem_follow_link_inline,
};
static struct inode_operations shmem_symlink_inode_operations = {
.truncate = shmem_truncate,
- .readlink = shmem_readlink,
+ .readlink = generic_readlink,
.follow_link = shmem_follow_link,
+ .put_link = shmem_put_link,
};
static int shmem_parse_options(char *options, int *mode, uid_t *uid, gid_t *gid, unsigned long *blocks, unsigned long *inodes)
static int shmem_remount_fs(struct super_block *sb, int *flags, char *data)
{
struct shmem_sb_info *sbinfo = SHMEM_SB(sb);
- unsigned long max_blocks = sbinfo->max_blocks;
- unsigned long max_inodes = sbinfo->max_inodes;
+ unsigned long max_blocks = 0;
+ unsigned long max_inodes = 0;
+ if (sbinfo) {
+ max_blocks = sbinfo->max_blocks;
+ max_inodes = sbinfo->max_inodes;
+ }
if (shmem_parse_options(data, NULL, NULL, NULL, &max_blocks, &max_inodes))
return -EINVAL;
+ /* Keep it simple: disallow limited <-> unlimited remount */
+ if ((max_blocks || max_inodes) == !sbinfo)
+ return -EINVAL;
+ /* But allow the pointless unlimited -> unlimited remount */
+ if (!sbinfo)
+ return 0;
return shmem_set_size(sbinfo, max_blocks, max_inodes);
}
#endif
+static void shmem_put_super(struct super_block *sb)
+{
+ kfree(sb->s_fs_info);
+ sb->s_fs_info = NULL;
+}
+
static int shmem_fill_super(struct super_block *sb,
void *data, int silent)
{
struct inode *inode;
struct dentry *root;
- unsigned long blocks, inodes;
int mode = S_IRWXUGO | S_ISVTX;
uid_t uid = current->fsuid;
gid_t gid = current->fsgid;
- struct shmem_sb_info *sbinfo;
int err = -ENOMEM;
- sbinfo = kmalloc(sizeof(struct shmem_sb_info), GFP_KERNEL);
- if (!sbinfo)
- return -ENOMEM;
- sb->s_fs_info = sbinfo;
- memset(sbinfo, 0, sizeof(struct shmem_sb_info));
+#ifdef CONFIG_TMPFS
+ unsigned long blocks = 0;
+ unsigned long inodes = 0;
/*
* Per default we only allow half of the physical ram per
- * tmpfs instance
+ * tmpfs instance, limiting inodes to one per page of lowmem;
+ * but the internal instance is left unlimited.
*/
- blocks = inodes = totalram_pages / 2;
+ if (!(sb->s_flags & MS_NOUSER)) {
+ blocks = totalram_pages / 2;
+ inodes = totalram_pages - totalhigh_pages;
+ if (inodes > blocks)
+ inodes = blocks;
+
+ if (shmem_parse_options(data, &mode,
+ &uid, &gid, &blocks, &inodes))
+ return -EINVAL;
+ }
-#ifdef CONFIG_TMPFS
- if (shmem_parse_options(data, &mode, &uid, &gid, &blocks, &inodes)) {
- err = -EINVAL;
- goto failed;
+ if (blocks || inodes) {
+ struct shmem_sb_info *sbinfo;
+ sbinfo = kmalloc(sizeof(struct shmem_sb_info), GFP_KERNEL);
+ if (!sbinfo)
+ return -ENOMEM;
+ sb->s_fs_info = sbinfo;
+ spin_lock_init(&sbinfo->stat_lock);
+ sbinfo->max_blocks = blocks;
+ sbinfo->free_blocks = blocks;
+ sbinfo->max_inodes = inodes;
+ sbinfo->free_inodes = inodes;
}
-#else
- sb->s_flags |= MS_NOUSER;
#endif
- spin_lock_init(&sbinfo->stat_lock);
- sbinfo->max_blocks = blocks;
- sbinfo->free_blocks = blocks;
- sbinfo->max_inodes = inodes;
- sbinfo->free_inodes = inodes;
sb->s_maxbytes = SHMEM_MAX_BYTES;
sb->s_blocksize = PAGE_CACHE_SIZE;
sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
- sb->s_magic = TMPFS_MAGIC;
+ sb->s_magic = TMPFS_SUPER_MAGIC;
sb->s_op = &shmem_ops;
inode = shmem_get_inode(sb, S_IFDIR | mode, 0);
if (!inode)
failed_iput:
iput(inode);
failed:
- kfree(sbinfo);
- sb->s_fs_info = NULL;
+ shmem_put_super(sb);
return err;
}
-static void shmem_put_super(struct super_block *sb)
-{
- kfree(sb->s_fs_info);
- sb->s_fs_info = NULL;
-}
-
static kmem_cache_t *shmem_inode_cachep;
static struct inode *shmem_alloc_inode(struct super_block *sb)
static void shmem_destroy_inode(struct inode *inode)
{
+ mpol_free_shared_policy(&SHMEM_I(inode)->policy);
kmem_cache_free(shmem_inode_cachep, SHMEM_I(inode));
}
static int init_inodecache(void)
{
shmem_inode_cachep = kmem_cache_create("shmem_inode_cache",
- sizeof(struct shmem_inode_info),
- 0, SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT,
- init_once, NULL);
+ sizeof(struct shmem_inode_info),
+ 0, 0, init_once, NULL);
if (shmem_inode_cachep == NULL)
return -ENOMEM;
return 0;
static struct vm_operations_struct shmem_vm_ops = {
.nopage = shmem_nopage,
.populate = shmem_populate,
+#ifdef CONFIG_NUMA
+ .set_policy = shmem_set_policy,
+ .get_policy = shmem_get_policy,
+#endif
};
static struct super_block *shmem_get_sb(struct file_system_type *fs_type,
#ifdef CONFIG_TMPFS
devfs_mk_dir("shm");
#endif
- shm_mnt = kern_mount(&tmpfs_fs_type);
+ shm_mnt = do_kern_mount(tmpfs_fs_type.name, MS_NOUSER,
+ tmpfs_fs_type.name, NULL);
if (IS_ERR(shm_mnt)) {
error = PTR_ERR(shm_mnt);
printk(KERN_ERR "Could not kern_mount tmpfs\n");
goto out1;
}
-
- /* The internal instance should not do size checking */
- shmem_set_size(SHMEM_SB(shm_mnt->mnt_sb), ULONG_MAX, ULONG_MAX);
return 0;
out1:
if (IS_ERR(shm_mnt))
return (void *)shm_mnt;
- if (size > SHMEM_MAX_BYTES)
+ if (size < 0 || size > SHMEM_MAX_BYTES)
return ERR_PTR(-EINVAL);
if (shmem_acct_size(flags, size))
file->f_mapping = inode->i_mapping;
file->f_op = &shmem_file_operations;
file->f_mode = FMODE_WRITE | FMODE_READ;
- return(file);
+ return file;
close_file:
put_filp(file);
git://git.onelab.eu / linux-2.6.git / blobdiff