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Bug fixes for 6.6-rc4:

Browse Source 
* Handle a race between writing and shrinking block devices by
    returning EIO.
  * Fix a typo in a comment.
 
 Signed-off-by: Darrick J. Wong <djwong@kernel.org>
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Merge tag 'iomap-6.6-fixes-4' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux

Pull iomap fixes from Darrick Wong:

 - Handle a race between writing and shrinking block devices by
   returning EIO

 - Fix a typo in a comment

* tag 'iomap-6.6-fixes-4' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux:
  iomap: Spelling s/preceeding/preceding/g
  iomap: add a workaround for racy i_size updates on block devices
This commit is contained in:
Linus Torvalds 2023-09-30 11:01:38 -07:00
commit 25d48d570e
2 changed files with 11 additions and 2 deletions
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11
fs/buffer.c
View File

@ -2058,8 +2058,17 @@ iomap_to_bh(struct inode *inode, sector_t block, struct buffer_head *bh,
fallthrough;
case IOMAP_MAPPED:
if ((iomap->flags & IOMAP_F_NEW) ||
offset >= i_size_read(inode))
offset >= i_size_read(inode)) {
/*
* This can happen if truncating the block device races
* with the check in the caller as i_size updates on
* block devices aren't synchronized by i_rwsem for
* block devices.
*/
if (S_ISBLK(inode->i_mode))
return -EIO;
set_buffer_new(bh);
}
bh->b_blocknr = (iomap->addr + offset - iomap->offset) >>
inode->i_blkbits;
set_buffer_mapped(bh);

2
fs/iomap/buffered-io.c
View File

@ -1049,7 +1049,7 @@ static int iomap_write_delalloc_punch(struct inode *inode, struct folio *folio,
/*
* Scan the data range passed to us for dirty page cache folios. If we find a
* dirty folio, punch out the preceeding range and update the offset from which
* dirty folio, punch out the preceding range and update the offset from which
* the next punch will start from.
*
* We can punch out storage reservations under clean pages because they either