From 308dfe49eb753d7263fa4e001251d733c710ed14 Mon Sep 17 00:00:00 2001 From: Dave Chinner Date: Sat, 18 Mar 2023 12:15:19 +0200 Subject: [PATCH] xfs: fallocate() should call file_modified() 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 Reviewed-by: Darrick J. Wong Signed-off-by: Darrick J. Wong Signed-off-by: Amir Goldstein Signed-off-by: Greg Kroah-Hartman --- fs/xfs/xfs_file.c | 13 +++++++++---- 1 file changed, 9 insertions(+), 4 deletions(-) diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c index 630525b1da77..a95af57a59a7 100644 --- a/fs/xfs/xfs_file.c +++ b/fs/xfs/xfs_file.c @@ -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) {