JFS: ext2 inode attributes for jfs
ext2 inode attributes with relevance for jfs:
'a' EXT2_APPEND_FL -> append only
'i' EXT2_IMMUTABLE_FL -> immutable file
's' EXT2_SECRM_FL -> zero file
'u' EXT2_UNRM_FL -> allow for unrm
'A' EXT2_NOATIME_FL -> no access time
'D' EXT2_DIRSYNC_FL -> dirsync
'S' EXT2_SYNC_FL -> sync
overview of jfs flags (partially for OS/2)
value (OS/2) Linux ext2 attrs
------------------------------------------------
0x00010000 IFJOURNAL -
0x00020000 ISPARSE used
0x00040000 INLINEEA used
0x00080000 - - JFS_NOATIME_FL
0x00100000 - - JFS_DIRSYNC_FL
0x00200000 - - JFS_SYNC_FL
0x00400000 - - JFS_SECRM_FL
0x00800000 ISWAPFILE - JFS_UNRM_FL
0x01000000 - - JFS_APPEND_FL
0x02000000 IREADONLY - JFS_IMMUTABLE_FL
0x04000000 IHIDDEN - -
0x08000000 ISYSTEM - -
0x10000000 - -
0x20000000 IDIRECTORY used
0x40000000 IARCHIVE -
0x80000000 INEWNAME -
the implementation is straight forward, except
for the fact that the attributes have to be mapped
to match with the ext2 ones to avoid a separate
tool for manipulating them (this could be avoided
when using a separate flag field in the on-disk
representation, but the overhead is minimal)
a special jfs_ioctl is added to allow for the new
JFS_IOC_GETFLAGS and JFS_IOC_SETFLAGS calls.
a helper function jfs_set_inode_flags() to transfer
the flags from the on-disk version to the inode
minor changes to allow flag inheritance on inode
creation, as well as a cleanup of the on-disk
flags (including the new ones)
beforementioned helper to map between ext2 and jfs
versions of the new flags ...
the JFS_SECRM_FL and JFS_UNRM_FL are not done yet
and I'm not 100% sure they are worth the effort,
the rest seems to work out of the box ...
Signed-off-by: Herbert Poetzl <herbert@13thfloor.at>
Signed-off-by: Dave Kleikamp <shaggy@austin.ibm.com>
diff --git a/fs/jfs/Makefile b/fs/jfs/Makefile
index 6f1e0e9..3adb639 100644
--- a/fs/jfs/Makefile
+++ b/fs/jfs/Makefile
@@ -8,7 +8,8 @@
jfs_xtree.o jfs_imap.o jfs_debug.o jfs_dmap.o \
jfs_unicode.o jfs_dtree.o jfs_inode.o \
jfs_extent.o symlink.o jfs_metapage.o \
- jfs_logmgr.o jfs_txnmgr.o jfs_uniupr.o resize.o xattr.o
+ jfs_logmgr.o jfs_txnmgr.o jfs_uniupr.o \
+ resize.o xattr.o ioctl.o
jfs-$(CONFIG_JFS_POSIX_ACL) += acl.o
diff --git a/fs/jfs/file.c b/fs/jfs/file.c
index c2c19c9..e1ac6e4 100644
--- a/fs/jfs/file.c
+++ b/fs/jfs/file.c
@@ -113,4 +113,5 @@
.sendfile = generic_file_sendfile,
.fsync = jfs_fsync,
.release = jfs_release,
+ .ioctl = jfs_ioctl,
};
diff --git a/fs/jfs/inode.c b/fs/jfs/inode.c
index d7834a9..51a5fed 100644
--- a/fs/jfs/inode.c
+++ b/fs/jfs/inode.c
@@ -55,6 +55,7 @@
inode->i_op = &jfs_file_inode_operations;
init_special_inode(inode, inode->i_mode, inode->i_rdev);
}
+ jfs_set_inode_flags(inode);
}
/*
diff --git a/fs/jfs/jfs_dinode.h b/fs/jfs/jfs_dinode.h
index 580a3258..9f2572a 100644
--- a/fs/jfs/jfs_dinode.h
+++ b/fs/jfs/jfs_dinode.h
@@ -139,13 +139,36 @@
/* more extended mode bits: attributes for OS/2 */
#define IREADONLY 0x02000000 /* no write access to file */
-#define IARCHIVE 0x40000000 /* file archive bit */
-#define ISYSTEM 0x08000000 /* system file */
#define IHIDDEN 0x04000000 /* hidden file */
-#define IRASH 0x4E000000 /* mask for changeable attributes */
-#define INEWNAME 0x80000000 /* non-8.3 filename format */
+#define ISYSTEM 0x08000000 /* system file */
+
#define IDIRECTORY 0x20000000 /* directory (shadow of real bit) */
+#define IARCHIVE 0x40000000 /* file archive bit */
+#define INEWNAME 0x80000000 /* non-8.3 filename format */
+
+#define IRASH 0x4E000000 /* mask for changeable attributes */
#define ATTRSHIFT 25 /* bits to shift to move attribute
specification to mode position */
+/* extended attributes for Linux */
+
+#define JFS_NOATIME_FL 0x00080000 /* do not update atime */
+
+#define JFS_DIRSYNC_FL 0x00100000 /* dirsync behaviour */
+#define JFS_SYNC_FL 0x00200000 /* Synchronous updates */
+#define JFS_SECRM_FL 0x00400000 /* Secure deletion */
+#define JFS_UNRM_FL 0x00800000 /* allow for undelete */
+
+#define JFS_APPEND_FL 0x01000000 /* writes to file may only append */
+#define JFS_IMMUTABLE_FL 0x02000000 /* Immutable file */
+
+#define JFS_FL_USER_VISIBLE 0x03F80000
+#define JFS_FL_USER_MODIFIABLE 0x03F80000
+#define JFS_FL_INHERIT 0x03C80000
+
+/* These are identical to EXT[23]_IOC_GETFLAGS/SETFLAGS */
+#define JFS_IOC_GETFLAGS _IOR('f', 1, long)
+#define JFS_IOC_SETFLAGS _IOW('f', 2, long)
+
+
#endif /*_H_JFS_DINODE */
diff --git a/fs/jfs/jfs_inode.c b/fs/jfs/jfs_inode.c
index 2af5efb..ae2772c 100644
--- a/fs/jfs/jfs_inode.c
+++ b/fs/jfs/jfs_inode.c
@@ -25,6 +25,26 @@
#include "jfs_dinode.h"
#include "jfs_debug.h"
+
+void jfs_set_inode_flags(struct inode *inode)
+{
+ unsigned int flags = JFS_IP(inode)->mode2;
+
+ inode->i_flags &= ~(S_IMMUTABLE | S_APPEND |
+ S_NOATIME | S_DIRSYNC | S_SYNC);
+
+ if (flags & JFS_IMMUTABLE_FL)
+ inode->i_flags |= S_IMMUTABLE;
+ if (flags & JFS_APPEND_FL)
+ inode->i_flags |= S_APPEND;
+ if (flags & JFS_NOATIME_FL)
+ inode->i_flags |= S_NOATIME;
+ if (flags & JFS_DIRSYNC_FL)
+ inode->i_flags |= S_DIRSYNC;
+ if (flags & JFS_SYNC_FL)
+ inode->i_flags |= S_SYNC;
+}
+
/*
* NAME: ialloc()
*
@@ -74,10 +94,20 @@
}
inode->i_mode = mode;
- if (S_ISDIR(mode))
- jfs_inode->mode2 = IDIRECTORY | mode;
+ /* inherit flags from parent */
+ jfs_inode->mode2 = JFS_IP(parent)->mode2 & JFS_FL_INHERIT;
+
+ if (S_ISDIR(mode)) {
+ jfs_inode->mode2 |= IDIRECTORY;
+ jfs_inode->mode2 &= ~JFS_DIRSYNC_FL;
+ }
+ else if (S_ISLNK(mode))
+ jfs_inode->mode2 &=
+ ~(JFS_IMMUTABLE_FL|JFS_APPEND_FL);
else
- jfs_inode->mode2 = INLINEEA | ISPARSE | mode;
+ jfs_inode->mode2 |= INLINEEA | ISPARSE;
+ jfs_inode->mode2 |= mode;
+
inode->i_blksize = sb->s_blocksize;
inode->i_blocks = 0;
inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
@@ -98,6 +128,7 @@
jfs_inode->atlhead = 0;
jfs_inode->atltail = 0;
jfs_inode->xtlid = 0;
+ jfs_set_inode_flags(inode);
jfs_info("ialloc returns inode = 0x%p\n", inode);
diff --git a/fs/jfs/jfs_inode.h b/fs/jfs/jfs_inode.h
index b54bac5..095d471 100644
--- a/fs/jfs/jfs_inode.h
+++ b/fs/jfs/jfs_inode.h
@@ -20,6 +20,8 @@
extern struct inode *ialloc(struct inode *, umode_t);
extern int jfs_fsync(struct file *, struct dentry *, int);
+extern int jfs_ioctl(struct inode *, struct file *,
+ unsigned int, unsigned long);
extern void jfs_read_inode(struct inode *);
extern int jfs_commit_inode(struct inode *, int);
extern int jfs_write_inode(struct inode*, int);
@@ -29,6 +31,7 @@
extern void jfs_truncate_nolock(struct inode *, loff_t);
extern void jfs_free_zero_link(struct inode *);
extern struct dentry *jfs_get_parent(struct dentry *dentry);
+extern void jfs_set_inode_flags(struct inode *);
extern struct address_space_operations jfs_aops;
extern struct inode_operations jfs_dir_inode_operations;
diff --git a/fs/jfs/namei.c b/fs/jfs/namei.c
index ed4d170..309cee5 100644
--- a/fs/jfs/namei.c
+++ b/fs/jfs/namei.c
@@ -1523,6 +1523,7 @@
.read = generic_read_dir,
.readdir = jfs_readdir,
.fsync = jfs_fsync,
+ .ioctl = jfs_ioctl,
};
static int jfs_ci_hash(struct dentry *dir, struct qstr *this)