kernel.git/fs/btrfs/ctree.c, branch linux-3.4.y

Btrfs: avoid sleeping in verify_parent_transid while atomic

2012-05-06T11:23:47Z

verify_parent_transid needs to lock the extent range to make sure no IO is underway, and so it can safely clear the uptodate bits if our checks fail. But, a few callers are using it with spinlocks held. Most of the time, the generation numbers are going to match, and we don't want to switch to a blocking lock just for the error case. This adds an atomic flag to verify_parent_transid, and changes it to return EAGAIN if it needs to block to properly verifiy things. Signed-off-by: Chris Mason

Btrfs: Add properly locking around add_root_to_dirty_list

2012-05-04T19:14:11Z

add_root_to_dirty_list happens once at the very beginning of the transaction, but it is still racey. Signed-off-by: Chris Mason

Merge branch 'error-handling' into for-linus

2012-03-29T00:31:37Z

Conflicts: fs/btrfs/ctree.c fs/btrfs/disk-io.c fs/btrfs/extent-tree.c fs/btrfs/extent_io.c fs/btrfs/extent_io.h fs/btrfs/inode.c fs/btrfs/scrub.c Signed-off-by: Chris Mason

Btrfs: adjust the write_lock_level as we unlock

2012-03-26T21:04:24Z

btrfs_search_slot sometimes needs write locks on high levels of the tree. It remembers the highest level that needs a write lock and will use that for all future searches through the tree in a given call. But, very often we'll just cow the top level or the level below and we won't really need write locks on the root again after that. This patch changes things to adjust the write lock requirement as it unlocks levels. Signed-off-by: Chris Mason

Btrfs: add the ability to cache a pointer into the eb

2012-03-26T21:04:23Z

This cuts down on the CPU time used by map_private_extent_buffer Signed-off-by: Chris Mason

Btrfs: introduce free_extent_buffer_stale

2012-03-26T20:51:08Z

Because btrfs cow's we can end up with extent buffers that are no longer necessary just sitting around in memory. So instead of evicting these pages, we could end up evicting things we actually care about. Thus we have free_extent_buffer_stale for use when we are freeing tree blocks. This will make it so that the ref for the eb being in the radix tree is dropped as soon as possible and then is freed when the refcount hits 0 instead of waiting to be released by releasepage. Thanks, Signed-off-by: Josef Bacik

btrfs: replace many BUG_ONs with proper error handling

2012-03-22T10:52:54Z

btrfs currently handles most errors with BUG_ON. This patch is a work-in- progress but aims to handle most errors other than internal logic errors and ENOMEM more gracefully. This iteration prevents most crashes but can run into lockups with the page lock on occasion when the timing "works out." Signed-off-by: Jeff Mahoney

btrfs: Go readonly on tree errors in balance_level

2012-03-22T00:45:38Z

balace_level() seems to deal with missing tree nodes by BUG_ON(). Instead, we can easily just set the file system readonly and bubble -EROFS back up the stack. Signed-off-by: Mark Fasheh

btrfs: Don't BUG_ON errors from update_ref_for_cow()

2012-03-22T00:45:38Z

__btrfs_cow_block(), the only caller of update_ref_for_cow() will BUG_ON() any error return. Instead, we can go read-only fs as update_ref_for_cow() manipulates disk data in a way which doesn't look like it's easily rolled back. Signed-off-by: Mark Fasheh

btrfs: Go readonly on bad extent refs in update_ref_for_cow()

2012-03-22T00:45:37Z

update_ref_for_cow() will BUG_ON() after it's call to btrfs_lookup_extent_info() if no existing references are found. Since refs are computed directly from disk, this should be treated as a corruption instead of a logic error. Signed-off-by: Mark Fasheh