reiserfs: delay reiserfs lock until journal initialization

In the mount path, transactions that are made before journal
initialization don't involve the filesystem.  We can delay the reiserfs
lock until we play with the journal.

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Jeff Mahoney <jeffm@suse.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/fs/reiserfs/bitmap.c b/fs/reiserfs/bitmap.c
index d1aca1df4f9208ec706d1b7228b68ae32c17ce96..5bab9216cfd00717b8814a29ae5ea71d98e2f760 100644 (file)
--- a/fs/reiserfs/bitmap.c
+++ b/fs/reiserfs/bitmap.c
@@ -1273,10 +1273,7 @@ int reiserfs_init_bitmap_cache(struct super_block *sb)
        struct reiserfs_bitmap_info *bitmap;
        unsigned int bmap_nr = reiserfs_bmap_count(sb);
 
-       /* Avoid lock recursion in fault case */
-       reiserfs_write_unlock(sb);
        bitmap = vmalloc(sizeof(*bitmap) * bmap_nr);
-       reiserfs_write_lock(sb);
        if (bitmap == NULL)
                return -ENOMEM;
 

diff --git a/fs/reiserfs/super.c b/fs/reiserfs/super.c
index 14363b96b6afafa74a80c2c66553c8d914064268..1f0d4fa530b83b81820d741347eb72e873efa137 100644 (file)
--- a/fs/reiserfs/super.c
+++ b/fs/reiserfs/super.c
@@ -1655,22 +1655,11 @@ static int reiserfs_fill_super(struct super_block *s, void *data, int silent)
        mutex_init(&REISERFS_SB(s)->lock);
        REISERFS_SB(s)->lock_depth = -1;
 
-       /*
-        * This function is called with the bkl, which also was the old
-        * locking used here.
-        * do_journal_begin() will soon check if we hold the lock (ie: was the
-        * bkl). This is likely because do_journal_begin() has several another
-        * callers because at this time, it doesn't seem to be necessary to
-        * protect against anything.
-        * Anyway, let's be conservative and lock for now.
-        */
-       reiserfs_write_lock(s);
-
        jdev_name = NULL;
        if (reiserfs_parse_options
            (s, (char *)data, &(sbi->s_mount_opt), &blocks, &jdev_name,
             &commit_max_age, qf_names, &qfmt) == 0) {
-               goto error;
+               goto error_unlocked;
        }
 #ifdef CONFIG_QUOTA
        handle_quota_files(s, qf_names, &qfmt);
@@ -1678,7 +1667,7 @@ static int reiserfs_fill_super(struct super_block *s, void *data, int silent)
 
        if (blocks) {
                SWARN(silent, s, "jmacd-7", "resize option for remount only");
-               goto error;
+               goto error_unlocked;
        }
 
        /* try old format (undistributed bitmap, super block in 8-th 1k block of a device) */
@@ -1688,7 +1677,7 @@ static int reiserfs_fill_super(struct super_block *s, void *data, int silent)
        else if (read_super_block(s, REISERFS_DISK_OFFSET_IN_BYTES)) {
                SWARN(silent, s, "sh-2021", "can not find reiserfs on %s",
                      reiserfs_bdevname(s));
-               goto error;
+               goto error_unlocked;
        }
 
        rs = SB_DISK_SUPER_BLOCK(s);
@@ -1704,7 +1693,7 @@ static int reiserfs_fill_super(struct super_block *s, void *data, int silent)
                      "or increase size of your LVM partition");
                SWARN(silent, s, "", "Or may be you forgot to "
                      "reboot after fdisk when it told you to");
-               goto error;
+               goto error_unlocked;
        }
 
        sbi->s_mount_state = SB_REISERFS_STATE(s);
@@ -1712,8 +1701,9 @@ static int reiserfs_fill_super(struct super_block *s, void *data, int silent)
 
        if ((errval = reiserfs_init_bitmap_cache(s))) {
                SWARN(silent, s, "jmacd-8", "unable to read bitmap");
-               goto error;
+               goto error_unlocked;
        }
+
        errval = -EINVAL;
 #ifdef CONFIG_REISERFS_CHECK
        SWARN(silent, s, "", "CONFIG_REISERFS_CHECK is set ON");
@@ -1736,6 +1726,17 @@ static int reiserfs_fill_super(struct super_block *s, void *data, int silent)
        if (reiserfs_barrier_flush(s)) {
                printk("reiserfs: using flush barriers\n");
        }
+
+       /*
+        * This path assumed to be called with the BKL in the old times.
+        * Now we have inherited the big reiserfs lock from it and many
+        * reiserfs helpers called in the mount path and elsewhere require
+        * this lock to be held even if it's not always necessary. Let's be
+        * conservative and hold it early. The window can be reduced after
+        * careful review of the code.
+        */
+       reiserfs_write_lock(s);
+
        // set_device_ro(s->s_dev, 1) ;
        if (journal_init(s, jdev_name, old_format, commit_max_age)) {
                SWARN(silent, s, "sh-2022",
@@ -1896,12 +1897,16 @@ static int reiserfs_fill_super(struct super_block *s, void *data, int silent)
        return (0);
 
 error:
-       if (jinit_done) {       /* kill the commit thread, free journal ram */
+       reiserfs_write_unlock(s);
+
+error_unlocked:
+       /* kill the commit thread, free journal ram */
+       if (jinit_done) {
+               reiserfs_write_lock(s);
                journal_release_error(NULL, s);
+               reiserfs_write_unlock(s);
        }
 
-       reiserfs_write_unlock(s);
-
        reiserfs_free_bitmap_cache(s);
        if (SB_BUFFER_WITH_SB(s))
                brelse(SB_BUFFER_WITH_SB(s));