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authorDuane Griffin <duaneg@dghda.com>2009-01-07 18:07:21 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2009-01-08 08:31:00 -0800
commitef8b646183868b2d042fa6cde0eef2a31263ff85 (patch)
tree5f8ebd60f844fcb7b1b056d6d663151a2f5e16f9 /include/linux/ext2_fs.h
parent0e090f1e05a563cc9acdda442767176bf1616001 (diff)
downloadvexpress-lsk-ef8b646183868b2d042fa6cde0eef2a31263ff85.tar.gz
ext2: 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/ext2_fs.h')
-rw-r--r--include/linux/ext2_fs.h17
1 files changed, 17 insertions, 0 deletions
diff --git a/include/linux/ext2_fs.h b/include/linux/ext2_fs.h
index c3a05181936..121720d74e1 100644
--- a/include/linux/ext2_fs.h
+++ b/include/linux/ext2_fs.h
@@ -201,6 +201,23 @@ struct ext2_group_desc
EXT2_NOCOMP_FL | EXT2_JOURNAL_DATA_FL |\
EXT2_NOTAIL_FL | EXT2_DIRSYNC_FL)
+/* Flags that are appropriate for regular files (all but dir-specific ones). */
+#define EXT2_REG_FLMASK (~(EXT2_DIRSYNC_FL | EXT2_TOPDIR_FL))
+
+/* Flags that are appropriate for non-directories/regular files. */
+#define EXT2_OTHER_FLMASK (EXT2_NODUMP_FL | EXT2_NOATIME_FL)
+
+/* Mask out flags that are inappropriate for the given type of inode. */
+static inline __u32 ext2_mask_flags(umode_t mode, __u32 flags)
+{
+ if (S_ISDIR(mode))
+ return flags;
+ else if (S_ISREG(mode))
+ return flags & EXT2_REG_FLMASK;
+ else
+ return flags & EXT2_OTHER_FLMASK;
+}
+
/*
* ioctl commands
*/