Fix ZFS_READONLY implementation on Linux (openzfs#121)

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 <[email protected]>
arter97 · Nov 23, 2023 · 317053b · 317053b
1 parent 6636313
commit 317053b
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Showing 2 changed files with 2 additions and 5 deletions.
diff --git a/module/os/linux/zfs/zfs_acl.c b/module/os/linux/zfs/zfs_acl.c
@@ -2620,7 +2620,7 @@ 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));
 	}

diff --git a/module/os/linux/zfs/zfs_vnops_os.c b/module/os/linux/zfs/zfs_vnops_os.c
@@ -1994,10 +1994,7 @@ zfs_setattr(znode_t *zp, vattr_t *vap, int flags, cred_t *cr, zidmap_t *mnt_ns)
 		goto out3;
 	}
 
-	if ((mask & ATTR_SIZE) && (zp->z_pflags & ZFS_READONLY)) {
-		err = SET_ERROR(EPERM);
-		goto out3;
-	}
+	/* ZFS_READONLY will be handled in zfs_zaccess() */
 
 	/*
 	 * Verify timestamps doesn't overflow 32 bits.