[PATCH] ufs2 write: mount as rw

These series of patches add UFS2 write-support.  UFS2 - is default file system
for recent versions of FreeBSD.

The main differences from UFS1 from write support point of view
are:
1)Not all inodes are allocated during formatation of disk.
2)All meta-data(pointer to data blocks) are 64bit(in UFS1 they
are 32bit).

So patch series consist of
1)make possible mount UFS2 in read-write mode
2)code to write ufs2 inodes and code to initialize inodes chunks.
3)work with 64bit meta-data

I made simple testing like create/deleting/writing/reading/truncating, also I
ran fsx-linux and untar and build kernel on UFS1 and UFS2, after that FreeBSD
fsck do not find any errors in fs.

This patch makes possible to mount ufs2 "rw", and updates UFS2 documentation:
remove note about bug(it fixed by reallocate blocks on the fly patch) and add
me in the list of people who want receive bug reports.

Signed-off-by: Evgeniy Dushistov <dushistov@mail.ru>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/Documentation/filesystems/ufs.txt b/Documentation/filesystems/ufs.txt
index 2b5a56a6a5588cd102fcbd57a3b2e8d700489f40..7a602adeca2b7399f04b50232c838a9aec305712 100644 (file)
--- a/Documentation/filesystems/ufs.txt
+++ b/Documentation/filesystems/ufs.txt
@@ -21,7 +21,7 @@ ufstype=type_of_ufs
                supported as read-write
 
        ufs2    used in FreeBSD 5.x
-               supported as read-only
+               supported as read-write
 
        5xbsd   synonym for ufs2
 
@@ -50,12 +50,11 @@ ufstype=type_of_ufs
 POSSIBLE PROBLEMS
 =================
 
-There is still bug in reallocation of fragment, in file fs/ufs/balloc.c, 
-line 364. But it seems working on current buffer cache configuration.
+See next section, if you have any.
 
 
 BUG REPORTS
 ===========
 
-Any ufs bug report you can send to daniel.pirkl@email.cz (do not send 
-partition tables bug reports.)
+Any ufs bug report you can send to daniel.pirkl@email.cz or
+to dushistov@mail.ru (do not send partition tables bug reports).

diff --git a/fs/ufs/super.c b/fs/ufs/super.c
index 209be95e9d188385d2fc6cf25b1c18e61fb8b87a..1427e44bfd2ae49d869b22b9ec1fa08363f4efc7 100644 (file)
--- a/fs/ufs/super.c
+++ b/fs/ufs/super.c
@@ -61,6 +61,8 @@
  * UFS2 (of FreeBSD 5.x) support added by
  * Niraj Kumar <niraj17@iitbombay.org>, Jan 2004
  *
+ * UFS2 write support added by
+ * Evgeniy Dushistov <dushistov@mail.ru>, 2007
  */
 
 
@@ -674,10 +676,6 @@ static int ufs_fill_super(struct super_block *sb, void *data, int silent)
                uspi->s_sbsize = super_block_size = 1536;
                uspi->s_sbbase =  0;
                flags |= UFS_TYPE_UFS2 | UFS_DE_44BSD | UFS_UID_44BSD | UFS_ST_44BSD | UFS_CG_44BSD;
-               if (!(sb->s_flags & MS_RDONLY)) {
-                       printk(KERN_INFO "ufstype=ufs2 is supported read-only\n");
-                       sb->s_flags |= MS_RDONLY;
-               }
                break;
                
        case UFS_MOUNT_UFSTYPE_SUN:
@@ -1156,7 +1154,8 @@ static int ufs_remount (struct super_block *sb, int *mount_flags, char *data)
 #else
                if (ufstype != UFS_MOUNT_UFSTYPE_SUN && 
                    ufstype != UFS_MOUNT_UFSTYPE_44BSD &&
-                   ufstype != UFS_MOUNT_UFSTYPE_SUNx86) {
+                   ufstype != UFS_MOUNT_UFSTYPE_SUNx86 &&
+                   ufstype != UFS_MOUNT_UFSTYPE_UFS2) {
                        printk("this ufstype is read-only supported\n");
                        return -EINVAL;
                }