nilfs2: tighten restrictions on inode flags
Nilfs has few rectrictions on which flags may be set on which inodes
like ext2/3/4 filesystems used to be. 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.
This introduces a flags masking function like those of extN and uses
it during inode creation.
Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
diff --git a/fs/nilfs2/inode.c b/fs/nilfs2/inode.c
index 2e6ac8e..2534af8 100644
--- a/fs/nilfs2/inode.c
+++ b/fs/nilfs2/inode.c
@@ -315,11 +315,8 @@
/* No lock is needed; iget() ensures it. */
}
- ii->i_flags = NILFS_I(dir)->i_flags;
- if (S_ISLNK(mode))
- ii->i_flags &= ~(FS_IMMUTABLE_FL | FS_APPEND_FL);
- if (!S_ISDIR(mode))
- ii->i_flags &= ~FS_DIRSYNC_FL;
+ ii->i_flags = nilfs_mask_flags(
+ mode, NILFS_I(dir)->i_flags & NILFS_FL_INHERITED);
/* ii->i_file_acl = 0; */
/* ii->i_dir_acl = 0; */
diff --git a/fs/nilfs2/nilfs.h b/fs/nilfs2/nilfs.h
index 777e8fd..3e3acb1 100644
--- a/fs/nilfs2/nilfs.h
+++ b/fs/nilfs2/nilfs.h
@@ -212,6 +212,23 @@
#define NILFS_ATIME_DISABLE
+/* Flags that should be inherited by new inodes from their parent. */
+#define NILFS_FL_INHERITED \
+ (FS_SECRM_FL | FS_UNRM_FL | FS_COMPR_FL | FS_SYNC_FL | \
+ FS_IMMUTABLE_FL | FS_APPEND_FL | FS_NODUMP_FL | FS_NOATIME_FL |\
+ FS_COMPRBLK_FL | FS_NOCOMP_FL | FS_NOTAIL_FL | FS_DIRSYNC_FL)
+
+/* Mask out flags that are inappropriate for the given type of inode. */
+static inline __u32 nilfs_mask_flags(umode_t mode, __u32 flags)
+{
+ if (S_ISDIR(mode))
+ return flags;
+ else if (S_ISREG(mode))
+ return flags & ~(FS_DIRSYNC_FL | FS_TOPDIR_FL);
+ else
+ return flags & (FS_NODUMP_FL | FS_NOATIME_FL);
+}
+
/* dir.c */
extern int nilfs_add_link(struct dentry *, struct inode *);
extern ino_t nilfs_inode_by_name(struct inode *, const struct qstr *);