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Fix ZFS_READONLY implementation on Linux

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MS-FSCC 2.6 is the governing document for
DOS attribute behavior. It specifies the following:

For a file, applications can read the file but
cannot write to it or delete it. For a directory,
applications cannot delete it, but applications can
create and delete files from the directory.

Signed-off-by: Andrew Walker <awalker@ixsystems.com>
Reviewed-by: Alexander Motin <alexander.motin@TrueNAS.com>
Reviewed-by: Ameer Hamza <ahamza@ixsystems.com>
Reviewed-by: Allan Jude <allan@klarasystems.com>
Reviewed-by: Rob Norris <rob.norris@klarasystems.com>
Closes #17837
This commit is contained in:
Andrew Walker
2025-10-20 08:28:57 -05:00
committed by GitHub
parent 5a03e358fc
commit 783a02b5d3
2 changed files with 2 additions and 5 deletions
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module/os/linux/zfs/zfs_acl.c
+1 -1
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@@ -2524,7 +2524,7 @@ zfs_zaccess_common(znode_t *zp, uint32_t v4_mode, uint32_t *working_mode,
* Also note: DOS R/O is ignored for directories.
*/
if ((v4_mode & WRITE_MASK_DATA) &&
S_ISDIR(ZTOI(zp)->i_mode) &&
!S_ISDIR(ZTOI(zp)->i_mode) &&
(zp->z_pflags & ZFS_READONLY)) {
return (SET_ERROR(EPERM));
}