kill-the-bkl/reiserfs: fix recursive reiserfs write lock in reiserfs_commit_write()

reiserfs_commit_write() is always called with the write lock held.
Thus the current calls to reiserfs_write_lock() in this function are
acquiring the lock recursively.
We can safely drop them.

This also solves further assumptions for this lock to be really
released while calling reiserfs_write_unlock().

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Jeff Mahoney <jeffm@suse.com>
Cc: Chris Mason <chris.mason@oracle.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Alexander Beregalov <a.beregalov@gmail.com>
Cc: Laurent Riffard <laurent.riffard@free.fr>

diff --git a/fs/reiserfs/inode.c b/fs/reiserfs/inode.c
index 853f4f6..965c8ea 100644 (file)
--- a/fs/reiserfs/inode.c
+++ b/fs/reiserfs/inode.c
@@ -2795,7 +2795,6 @@ int reiserfs_commit_write(struct file *f, struct page *page,
         */
        if (pos > inode->i_size) {
                struct reiserfs_transaction_handle myth;
-               reiserfs_write_lock(inode->i_sb);
                /* If the file have grown beyond the border where it
                   can have a tail, unmark it as needing a tail
                   packing */
@@ -2806,10 +2805,9 @@ int reiserfs_commit_write(struct file *f, struct page *page,
                        REISERFS_I(inode)->i_flags &= ~i_pack_on_close_mask;
 
                ret = journal_begin(&myth, inode->i_sb, 1);
-               if (ret) {
-                       reiserfs_write_unlock(inode->i_sb);
+               if (ret)
                        goto journal_error;
-               }
+
                reiserfs_update_inode_transaction(inode);
                inode->i_size = pos;
                /*
@@ -2821,16 +2819,13 @@ int reiserfs_commit_write(struct file *f, struct page *page,
                reiserfs_update_sd(&myth, inode);
                update_sd = 1;
                ret = journal_end(&myth, inode->i_sb, 1);
-               reiserfs_write_unlock(inode->i_sb);
                if (ret)
                        goto journal_error;
        }
        if (th) {
-               reiserfs_write_lock(inode->i_sb);
                if (!update_sd)
                        mark_inode_dirty(inode);
                ret = reiserfs_end_persistent_transaction(th);
-               reiserfs_write_unlock(inode->i_sb);
                if (ret)
                        goto out;
        }
@@ -2840,11 +2835,9 @@ int reiserfs_commit_write(struct file *f, struct page *page,
 
       journal_error:
        if (th) {
-               reiserfs_write_lock(inode->i_sb);
                if (!update_sd)
                        reiserfs_update_sd(th, inode);
                ret = reiserfs_end_persistent_transaction(th);
-               reiserfs_write_unlock(inode->i_sb);
        }
 
        return ret;