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authorDuane Griffin <duaneg@dghda.com>2009-01-07 18:07:26 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2009-01-08 08:31:01 -0800
commit04143e2fb9d512c21e1dcfb561dbb0445dcfdc8c (patch)
tree1a8b6add3f19db63663bcf33205b771272e451d8 /include/linux
parent2e8671cb566da993425d324fc355af31edc6e7f1 (diff)
ext3: tighten restrictions on inode flags
At the moment there are few restrictions on which flags may be set on which inodes. Specifically DIRSYNC may only be set on directories and IMMUTABLE and APPEND may not be set on links. Tighten that to disallow TOPDIR being set on non-directories and only NODUMP and NOATIME to be set on non-regular file, non-directories. Introduces a flags masking function which masks flags based on mode and use it during inode creation and when flags are set via the ioctl to facilitate future consistency. Signed-off-by: Duane Griffin <duaneg@dghda.com> Acked-by: Andreas Dilger <adilger@sun.com> Cc: <linux-ext4@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux')
-rw-r--r--include/linux/ext3_fs.h17
1 files changed, 17 insertions, 0 deletions
diff --git a/include/linux/ext3_fs.h b/include/linux/ext3_fs.h
index b745619a9b8e..d76800f6ecf0 100644
--- a/include/linux/ext3_fs.h
+++ b/include/linux/ext3_fs.h
@@ -185,6 +185,23 @@ struct ext3_group_desc
EXT3_NOCOMPR_FL | EXT3_JOURNAL_DATA_FL |\
EXT3_NOTAIL_FL | EXT3_DIRSYNC_FL)
+/* Flags that are appropriate for regular files (all but dir-specific ones). */
+#define EXT3_REG_FLMASK (~(EXT3_DIRSYNC_FL | EXT3_TOPDIR_FL))
+
+/* Flags that are appropriate for non-directories/regular files. */
+#define EXT3_OTHER_FLMASK (EXT3_NODUMP_FL | EXT3_NOATIME_FL)
+
+/* Mask out flags that are inappropriate for the given type of inode. */
+static inline __u32 ext3_mask_flags(umode_t mode, __u32 flags)
+{
+ if (S_ISDIR(mode))
+ return flags;
+ else if (S_ISREG(mode))
+ return flags & EXT3_REG_FLMASK;
+ else
+ return flags & EXT3_OTHER_FLMASK;
+}
+
/*
* Inode dynamic state flags
*/