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Merge tag 'hole_punch_for_v5.15-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs

Pull fs hole punching vs cache filling race fixes from Jan Kara:
 "Fix races leading to possible data corruption or stale data exposure
  in multiple filesystems when hole punching races with operations such
  as readahead.

  This is the series I was sending for the last merge window but with
  your objection fixed - now filemap_fault() has been modified to take
  invalidate_lock only when we need to create new page in the page cache
  and / or bring it uptodate"

* tag 'hole_punch_for_v5.15-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs:
  filesystems/locking: fix Malformed table warning
  cifs: Fix race between hole punch and page fault
  ceph: Fix race between hole punch and page fault
  fuse: Convert to using invalidate_lock
  f2fs: Convert to using invalidate_lock
  zonefs: Convert to using invalidate_lock
  xfs: Convert double locking of MMAPLOCK to use VFS helpers
  xfs: Convert to use invalidate_lock
  xfs: Refactor xfs_isilocked()
  ext2: Convert to using invalidate_lock
  ext4: Convert to use mapping->invalidate_lock
  mm: Add functions to lock invalidate_lock for two mappings
  mm: Protect operations adding pages to page cache with invalidate_lock
  documentation: Sync file_operations members with reality
  mm: Fix comments mentioning i_mutex
This commit is contained in:
Linus Torvalds 2021-08-30 10:24:50 -07:00
commit aa99f3c2b9
40 changed files with 483 additions and 361 deletions
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12
fs/ext2/inode.c
View file

@ -1178,7 +1178,7 @@ static void ext2_free_branches(struct inode *inode, __le32 *p, __le32 *q, int de
ext2_free_data(inode, p, q);
}
/* dax_sem must be held when calling this function */
/* mapping->invalidate_lock must be held when calling this function */
static void __ext2_truncate_blocks(struct inode *inode, loff_t offset)
{
__le32 *i_data = EXT2_I(inode)->i_data;
@ -1195,7 +1195,7 @@ static void __ext2_truncate_blocks(struct inode *inode, loff_t offset)
iblock = (offset + blocksize-1) >> EXT2_BLOCK_SIZE_BITS(inode->i_sb);
#ifdef CONFIG_FS_DAX
WARN_ON(!rwsem_is_locked(&ei->dax_sem));
WARN_ON(!rwsem_is_locked(&inode->i_mapping->invalidate_lock));
#endif
n = ext2_block_to_path(inode, iblock, offsets, NULL);
@ -1277,9 +1277,9 @@ static void ext2_truncate_blocks(struct inode *inode, loff_t offset)
if (ext2_inode_is_fast_symlink(inode))
return;
dax_sem_down_write(EXT2_I(inode));
filemap_invalidate_lock(inode->i_mapping);
__ext2_truncate_blocks(inode, offset);
dax_sem_up_write(EXT2_I(inode));
filemap_invalidate_unlock(inode->i_mapping);
}
static int ext2_setsize(struct inode *inode, loff_t newsize)
@ -1309,10 +1309,10 @@ static int ext2_setsize(struct inode *inode, loff_t newsize)
if (error)
return error;
dax_sem_down_write(EXT2_I(inode));
filemap_invalidate_lock(inode->i_mapping);
truncate_setsize(inode, newsize);
__ext2_truncate_blocks(inode, newsize);
dax_sem_up_write(EXT2_I(inode));
filemap_invalidate_unlock(inode->i_mapping);
inode->i_mtime = inode->i_ctime = current_time(inode);
if (inode_needs_sync(inode)) {