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Diffstat (limited to 'mm/shmem.c')
-rw-r--r--mm/shmem.c29
1 files changed, 18 insertions, 11 deletions
diff --git a/mm/shmem.c b/mm/shmem.c
index bd20f8bb02aa..356dd99566ec 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -49,7 +49,6 @@ static struct vfsmount *shm_mnt;
#include <linux/backing-dev.h>
#include <linux/shmem_fs.h>
#include <linux/writeback.h>
-#include <linux/vfs.h>
#include <linux/blkdev.h>
#include <linux/security.h>
#include <linux/swapops.h>
@@ -219,7 +218,7 @@ static const struct file_operations shmem_file_operations;
static const struct inode_operations shmem_inode_operations;
static const struct inode_operations shmem_dir_inode_operations;
static const struct inode_operations shmem_special_inode_operations;
-static struct vm_operations_struct shmem_vm_ops;
+static const struct vm_operations_struct shmem_vm_ops;
static struct backing_dev_info shmem_backing_dev_info __read_mostly = {
.ra_pages = 0, /* No readahead */
@@ -1047,8 +1046,9 @@ static int shmem_writepage(struct page *page, struct writeback_control *wbc)
* sync from ever calling shmem_writepage; but a stacking filesystem
* may use the ->writepage of its underlying filesystem, in which case
* tmpfs should write out to swap only in response to memory pressure,
- * and not for pdflush or sync. However, in those cases, we do still
- * want to check if there's a redundant swappage to be discarded.
+ * and not for the writeback threads or sync. However, in those cases,
+ * we do still want to check if there's a redundant swappage to be
+ * discarded.
*/
if (wbc->for_reclaim)
swap = get_swap_page();
@@ -1097,6 +1097,10 @@ static int shmem_writepage(struct page *page, struct writeback_control *wbc)
shmem_swp_unmap(entry);
unlock:
spin_unlock(&info->lock);
+ /*
+ * add_to_swap_cache() doesn't return -EEXIST, so we can safely
+ * clear SWAP_HAS_CACHE flag.
+ */
swapcache_free(swap, NULL);
redirty:
set_page_dirty(page);
@@ -1630,8 +1634,8 @@ shmem_write_end(struct file *file, struct address_space *mapping,
if (pos + copied > inode->i_size)
i_size_write(inode, pos + copied);
- unlock_page(page);
set_page_dirty(page);
+ unlock_page(page);
page_cache_release(page);
return copied;
@@ -1968,13 +1972,13 @@ static int shmem_symlink(struct inode *dir, struct dentry *dentry, const char *s
iput(inode);
return error;
}
- unlock_page(page);
inode->i_mapping->a_ops = &shmem_aops;
inode->i_op = &shmem_symlink_inode_operations;
kaddr = kmap_atomic(page, KM_USER0);
memcpy(kaddr, symname, len);
kunmap_atomic(kaddr, KM_USER0);
set_page_dirty(page);
+ unlock_page(page);
page_cache_release(page);
}
if (dir->i_mode & S_ISGID)
@@ -2306,17 +2310,14 @@ int shmem_fill_super(struct super_block *sb, void *data, int silent)
int err = -ENOMEM;
/* Round up to L1_CACHE_BYTES to resist false sharing */
- sbinfo = kmalloc(max((int)sizeof(struct shmem_sb_info),
+ sbinfo = kzalloc(max((int)sizeof(struct shmem_sb_info),
L1_CACHE_BYTES), GFP_KERNEL);
if (!sbinfo)
return -ENOMEM;
- sbinfo->max_blocks = 0;
- sbinfo->max_inodes = 0;
sbinfo->mode = S_IRWXUGO | S_ISVTX;
sbinfo->uid = current_fsuid();
sbinfo->gid = current_fsgid();
- sbinfo->mpol = NULL;
sb->s_fs_info = sbinfo;
#ifdef CONFIG_TMPFS
@@ -2420,6 +2421,7 @@ static const struct address_space_operations shmem_aops = {
.write_end = shmem_write_end,
#endif
.migratepage = migrate_page,
+ .error_remove_page = generic_error_remove_page,
};
static const struct file_operations shmem_file_operations = {
@@ -2496,7 +2498,7 @@ static const struct super_operations shmem_ops = {
.put_super = shmem_put_super,
};
-static struct vm_operations_struct shmem_vm_ops = {
+static const struct vm_operations_struct shmem_vm_ops = {
.fault = shmem_fault,
#ifdef CONFIG_NUMA
.set_policy = shmem_set_policy,
@@ -2590,6 +2592,11 @@ int shmem_unuse(swp_entry_t entry, struct page *page)
return 0;
}
+int shmem_lock(struct file *file, int lock, struct user_struct *user)
+{
+ return 0;
+}
+
#define shmem_vm_ops generic_file_vm_ops
#define shmem_file_operations ramfs_file_operations
#define shmem_get_inode(sb, mode, dev, flags) ramfs_get_inode(sb, mode, dev)