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xfs: fix rounding in xfs_free_file_space 

The offset passed into xfs_free_file_space() needs to be rounded
down to a certain size, but the rounding mask is built by a 32 bit
variable. Hence the mask will always mask off the upper 32 bits of
the offset and lead to incorrect writeback and invalidation ranges.

This is not actually exposed as a bug because we writeback and
invalidate from the rounded offset to the end of the file, and hence
the offset we are actually punching a hole out of will always be
covered by the code. This needs fixing, however, if we ever want to
use exact ranges for writeback/invalidation here...

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Brian Foster <bfoster@redhat.com>
Signed-off-by: Ben Myers <bpm@sgi.com>

(cherry picked from commit 28ca489c63e9aceed8801d2f82d731b3c9aa50f5)
This commit is contained in:
Dave Chinner 2013-05-20 09:51:09 +10:00 committed by Ben Myers
parent 480d7467e4
commit 7031d0e1c4
1 changed files with 2 additions and 2 deletions
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4
fs/xfs/xfs_vnodeops.c
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@ -1453,7 +1453,7 @@ xfs_free_file_space(
xfs_mount_t *mp;
int nimap;
uint resblks;
uint rounding;
xfs_off_t rounding;
int rt;
xfs_fileoff_t startoffset_fsb;
xfs_trans_t *tp;
@ -1482,7 +1482,7 @@ xfs_free_file_space(
inode_dio_wait(VFS_I(ip));
}
rounding = max_t(uint, 1 << mp->m_sb.sb_blocklog, PAGE_CACHE_SIZE);
rounding = max_t(xfs_off_t, 1 << mp->m_sb.sb_blocklog, PAGE_CACHE_SIZE);
ioffset = offset & ~(rounding - 1);
error = -filemap_write_and_wait_range(VFS_I(ip)->i_mapping,
ioffset, -1);