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xfs: fallocate() should call file_modified()

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commit fbe7e520036583a783b13ff9744e35c2a329d9a4 upstream.

In XFS, we always update the inode change and modification time when
any fallocate() operation succeeds.  Furthermore, as various
fallocate modes can change the file contents (extending EOF,
punching holes, zeroing things, shifting extents), we should drop
file privileges like suid just like we do for a regular write().
There's already a VFS helper that figures all this out for us, so
use that.

The net effect of this is that we no longer drop suid/sgid if the
caller is root, but we also now drop file capabilities.

We also move the xfs_update_prealloc_flags() function so that it now
is only called by the scope that needs to set the the prealloc flag.

Based on a patch from Darrick Wong.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Dave Chinner 2023-03-18 12:15:19 +02:00 committed by Greg Kroah-Hartman
parent 35f049abba
commit 308dfe49eb
1 changed files with 9 additions and 4 deletions
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13
fs/xfs/xfs_file.c
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@ -895,6 +895,10 @@ xfs_file_fallocate(
goto out_unlock;
}
error = file_modified(file);
if (error)
goto out_unlock;
if (mode & FALLOC_FL_PUNCH_HOLE) {
error = xfs_free_file_space(ip, offset, len);
if (error)
@ -996,11 +1000,12 @@ xfs_file_fallocate(
if (error)
goto out_unlock;
}
}
error = xfs_update_prealloc_flags(ip, flags);
if (error)
goto out_unlock;
error = xfs_update_prealloc_flags(ip, XFS_PREALLOC_SET);
if (error)
goto out_unlock;
}
/* Change file size if needed */
if (new_size) {