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2008-11-19Btrfs: Fixes for 2.6.28-rc API changesChris Mason
* open/close_bdev_excl -> open/close_bdev_exclusive * blkdev_issue_discard takes a GFP mask now * Fix blkdev_issue_discard usage now that it is enabled Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-11-19Btrfs: fix free space accounting when unpinning extentsJosef Bacik
This patch fixes what I hope is the last early ENOSPC bug left. I did not know that pinned extents would merge into one big extent when inserted on to the pinned extent tree, so I was adding free space to a block group that could possibly span multiple block groups. This is a big issue because first that space doesn't exist in that block group, and second we won't actually use that space because there are a bunch of other checks to make sure we're allocating within the constraints of the block group. This patch fixes the problem by adding the btrfs_add_free_space to btrfs_update_pinned_extents which makes sure we are adding the appropriate amount of free space to the appropriate block group. Thanks much to Lee Trager for running my myriad of debug patches to help me track this problem down. Thank you, Signed-off-by: Josef Bacik <jbacik@redhat.com>
2008-11-19Btrfs: Do fsync log replay when mount -o ro, except when on readonly mediaChris Mason
fsync log replay can change the filesystem, so it cannot be delayed until mount -o rw,remount, and it can't be forgotten entirely. So, this patch changes btrfs to do with reiserfs, ext3 and xfs do, which is to do the log replay even when mounted readonly. On a readonly device if log replay is required, the mount is aborted. Getting all of this right had required fixing up some of the error handling in open_ctree. Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-11-19Btrfs: Avoid writeback stallsChris Mason
While building large bios in writepages, btrfs may end up waiting for other page writeback to finish if WB_SYNC_ALL is used. While it is waiting, the bio it is building has a number of pages with the writeback bit set and they aren't getting to the disk any time soon. This lowers the latencies of writeback in general by sending down the bio being built before waiting for other pages. The bio submission code tries to limit the total number of async bios in flight by waiting when we're over a certain number of async bios. But, the waits are happening while writepages is building bios, and this can easily lead to stalls and other problems for people calling wait_on_page_writeback. The current fix is to let the congestion tests take care of waiting. sync() and others make sure to drain the current async requests to make sure that everything that was pending when the sync was started really get to disk. The code would drain pending requests both before and after submitting a new request. But, if one of the requests is waiting for page writeback to finish, the draining waits might block that page writeback. This changes the draining code to only wait after submitting the bio being processed. Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-11-18Btrfs: switch back to wait_on_page_writeback to wait on metadata writesChris Mason
The extent based waiting was using more CPU, and other fixes have helped with the unplug storm problems. Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-11-18Btrfs: Update the disk format for the seed device and new root codeChris Mason
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-11-18Btrfs: unplug all devices in the unplug call backChris Mason
For larger multi-device filesystems, there was logic to limit the number of devices unplugged to just the page that was sent to our sync_page function. But, the code wasn't always unplugging the right device. Since this was just an optimization, disable it for now. Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-11-18Btrfs: Some fixes for batching extent insert.Liu Hui
In insert_extents(), when ret==1 and last is not zero, it should check if the current inserted item is the last item in this batching inserts. If so, it should just break from loop. If not, 'cur = insert_list->next' will make no sense because the list is empty now, and 'op' will point to an unexpectable place. There are also some trivial fixs in this patch including one comment typo error and deleting two redundant lines. Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-11-17Btrfs: prevent loops in the directory tree when creating snapshotsChris Mason
For a directory tree: /mnt/subvolA/subvolB btrfsctl -s /mnt/subvolA/subvolB /mnt Will create a directory loop with subvolA under subvolB. This commit uses the forward refs for each subvol and snapshot to error out before creating the loop. Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-11-17Btrfs: Add backrefs and forward refs for subvols and snapshotsChris Mason
Subvols and snapshots can now be referenced from any point in the directory tree. We need to maintain back refs for them so we can find lost subvols. Forward refs are added so that we know all of the subvols and snapshots referenced anywhere in the directory tree of a single subvol. This can be used to do recursive snapshotting (but they aren't yet) and it is also used to detect and prevent directory loops when creating new snapshots. Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-11-17Btrfs: Give each subvol and snapshot their own anonymous devidChris Mason
Each subvolume has its own private inode number space, and so we need to fill in different device numbers for each subvolume to avoid confusing applications. This commit puts a struct super_block into struct btrfs_root so it can call set_anon_super() and get a different device number generated for each root. btrfs_rename is changed to prevent renames across subvols. Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-11-17Btrfs: Allow subvolumes and snapshots anywhere in the directory treeChris Mason
Before, all snapshots and subvolumes lived in a single flat directory. This was awkward and confusing because the single flat directory was only writable with the ioctls. This commit changes the ioctls to create subvols and snapshots at any point in the directory tree. This requires making separate ioctls for snapshot and subvol creation instead of a combining them into one. The subvol ioctl does: btrfsctl -S subvol_name parent_dir After the ioctl is done subvol_name lives inside parent_dir. The snapshot ioctl does: btrfsctl -s path_for_snapshot root_to_snapshot path_for_snapshot can be an absolute or relative path. btrfsctl breaks it up into directory and basename components. root_to_snapshot can be any file or directory in the FS. The snapshot is taken of the entire root where that file lives. Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-11-17Btrfs: Add some debugging around the ENOSPC bugsJosef Bacik
Some people are still reporting problems with early enospc. This will help narrown down the cause. Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-11-17Btrfs: fix free space leakJosef Bacik
In my batch delete/update/insert patch I introduced a free space leak. The extent that we do the original search on in free_extents is never pinned, so we always update the block saying that it has free space, but the free space never actually gets added to the free space tree, since op->del will always be 0 and it's never actually added to the pinned extents tree. This patch fixes this problem by making sure we call pin_down_bytes on the pending extent op and set op->del to the return value of pin_down_bytes so update_block_group is called with the right value. This seems to fix the case where we were getting ENOSPC when there was plenty of space available. Signed-off-by: Josef Bacik <jbacik@redhat.com>
2008-11-12Btrfs: Add a missing return pointer checkyanhai zhu
Add a missing kzalloc() return pointer check in add_missing_dev(). Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-11-12Btrfs: Check kthread_should_stop() before schedule() in worker_loopyanhai zhu
In worker_loop(), the func should check whether it has been requested to stop before it decides to schedule out. Otherwise if the stop request(also the last wake_up()) sent by btrfs_stop_workers() happens when worker_loop() running after the "while" judgement and before schedule(), woker_loop() will schedule away and never be woken up, which will also cause btrfs_stop_workers() wait forever. Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-11-12Btrfs: Fix race in btrfs_mark_extent_writtenYan Zheng
When extent needs to be split, btrfs_mark_extent_written truncates the extent first, then inserts a new extent and increases the reference count. The race happens if someone else deletes the old extent before the new extent is inserted. The fix here is increase the reference count in advance. This race is similar to the race in btrfs_drop_extents that was recently fixed. Signed-off-by: Yan Zheng <zheng.yan@oracle.com>
2008-11-17Btrfs: Seed device supportYan Zheng
Seed device is a special btrfs with SEEDING super flag set and can only be mounted in read-only mode. Seed devices allow people to create new btrfs on top of it. The new FS contains the same contents as the seed device, but it can be mounted in read-write mode. This patch does the following: 1) split code in btrfs_alloc_chunk into two parts. The first part does makes the newly allocated chunk usable, but does not do any operation that modifies the chunk tree. The second part does the the chunk tree modifications. This division is for the bootstrap step of adding storage to the seed device. 2) Update device management code to handle seed device. The basic idea is: For an FS grown from seed devices, its seed devices are put into a list. Seed devices are opened on demand at mounting time. If any seed device is missing or has been changed, btrfs kernel module will refuse to mount the FS. 3) make btrfs_find_block_group not return NULL when all block groups are read-only. Signed-off-by: Yan Zheng <zheng.yan@oracle.com>
2008-11-12Btrfs: mount ro and remount supportYan Zheng
This patch adds mount ro and remount support. The main changes in patch are: adding btrfs_remount and related helper function; splitting the transaction related code out of close_ctree into btrfs_commit_super; updating allocator to properly handle read only block group. Signed-off-by: Yan Zheng <zheng.yan@oracle.com>
2008-11-12Btrfs: batch extent inserts/updates/deletions on the extent rootJosef Bacik
While profiling the allocator I noticed a good amount of time was being spent in finish_current_insert and del_pending_extents, and as the filesystem filled up more and more time was being spent in those functions. This patch aims to try and reduce that problem. This happens two ways 1) track if we tried to delete an extent that we are going to update or insert. Once we get into finish_current_insert we discard any of the extents that were marked for deletion. This saves us from doing unnecessary work almost every time finish_current_insert runs. 2) Batch insertion/updates/deletions. Instead of doing a btrfs_search_slot for each individual extent and doing the needed operation, we instead keep the leaf around and see if there is anything else we can do on that leaf. On the insert case I introduced a btrfs_insert_some_items, which will take an array of keys with an array of data_sizes and try and squeeze in as many of those keys as possible, and then return how many keys it was able to insert. In the update case we search for an extent ref, update the ref and then loop through the leaf to see if any of the other refs we are looking to update are on that leaf, and then once we are done we release the path and search for the next ref we need to update. And finally for the deletion we try and delete the extent+ref in pairs, so we will try to find extent+ref pairs next to the extent we are trying to free and free them in bulk if possible. This along with the other cluster fix that Chris pushed out a bit ago helps make the allocator preform more uniformly as it fills up the disk. There is still a slight drop as we fill up the disk since we start having to stick new blocks in odd places which results in more COW's than on a empty fs, but the drop is not nearly as severe as it was before. Signed-off-by: Josef Bacik <jbacik@redhat.com>
2008-11-12Btrfs: allow clone of an arbitrary file rangeSage Weil
This patch adds an additional CLONE_RANGE ioctl to clone an arbitrary (block-aligned) file range to another file. The original CLONE ioctl becomes a special case of cloning the entire file range. The logic is a bit more complex now since ranges may be cloned to different offsets, and because we may only be cloning the beginning or end of a particular extent or checksum item. An additional sanity check ensures the source and destination files aren't the same (which would previously deadlock), although eventually this could be extended to allow the duplication of file data at a different offset within the same file. Any extents within the destination range in the target file are dropped. We currently do not cope with the case where a compressed inline extent needs to be split. This will probably require decompressing the extent into a temporary address_space, and inserting just the cloned portion as a new compressed inline extent. For now, just return -EINVAL in this case. Note that this never comes up in the more common case of cloning an entire file. Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-11-13Btrfs: Fix handling of space info full during allocationsChris Mason
When we fail to allocate a new block group, we should still do the checks to make sure allocations try again with the minimum requested allocation size. This also fixes a deadlock that come from a missed down_read in the chunk allocation failure handling. Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-11-13Btrfs: Improve metadata read latenciesChris Mason
This fixes latency problems on metadata reads by making sure they don't go through the async submit queue, and by tuning down the amount of readahead done during btree searches. Also, the btrfs bdi congestion function is tuned to ignore the number of pending async bios and checksums pending. There is additional code that throttles new async bios now and the congestion function doesn't need to worry about it anymore. Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-11-11Btrfs: Fix compile warnings on 32 bit machinesChris Mason
Simple casting here and there to fix things up. Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-11-11Btrfs: Fix starting search offset inside btrfs_drop_extentsYan Zheng
btrfs_drop_extents will drop paths and search again when it needs to force COW of higher nodes. It was using the key it found during the last search as the offset for the next search. But, this wasn't always correct. The key could be from before our desired range, and because we're dropping the path, it is possible for file's items to change while we do the search again. The fix here is to make sure we don't search for something smaller than the offset btrfs_drop_extents was called with. Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-11-10Btrfs: empty_size allocation fixes againChris Mason
The allocator wasn't catching all of the cases where it needed to do extra loops because the check to enforce them wasn't happening early enough. When the allocator decided to increase the size of the allocation for metadata clustering, it wasn't always setting the empty_size to include the extra (optional) bytes. This also fixes the empty_size field to be correct. Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-11-10Btrfs: tune btrfs unplug functions for a small number of devicesChris Mason
When btrfs unplugs, it tries to find the correct device to unplug via search through the extent_map tree. This avoids unplugging a device that doesn't need it, but is a waste of time for filesystems with a small number of devices. This patch checks the total number of devices before doing the search. Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-11-10Btrfs: Turn off extent state leak debuggingChris Mason
The extent_io.c code has a #define to find and cleanup extent state leaks on module unmount. This adds a very highly contended spinlock to a hot path for most FS operations. Turn it off by default. A later changeset will add a .config option for it. Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-11-10Btrfs: Fix usage of struct extent_map->orig_startChris Mason
This makes sure the orig_start field in struct extent_map gets set everywhere the extent_map structs are created or modified. Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-11-10Btrfs: Use invalidatepage when writepage finds a page outside of i_sizeChris Mason
With all the recent fixes to the delalloc locking, it is now safe again to use invalidatepage inside the writepage code for pages outside of i_size. This used to deadlock against some of the code to write locked ranges of pages, but all of that has been fixed. Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-11-10Btrfs: Try harder while searching for free spaceChris Mason
The loop searching for free space would exit out too soon when metadata clustering was trying to allocate a large extent. This makes sure a full scan of the free space is done searching for only the minimum extent size requested by the higher layers. Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-11-10Btrfs: Fix use after free during compressed readsChris Mason
Yan's fix to use the correct file offset during compressed reads used the extent_map struct pointer after it had been freed. This saves the fields we want for later use instead. Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-11-10Btrfs: Fix csum error for compressed dataYan Zheng
The decompress code doesn't take the logical offset in extent pointer into account. If the logical offset isn't zero, data will be decompressed into wrong pages. The solution used here is to record the starting offset of the extent in the file separately from the logical start of the extent_map struct. This allows us to avoid problems inserting overlapping extents. Signed-off-by: Yan Zheng <zheng.yan@oracle.com>
2008-11-10Btrfs: Make sure pages are dirty before doing delalloc for themChris Mason
This adds a PageDirty check to the writeback path that locks pages for delalloc. If a page wasn't dirty at this point, it is in the process of being truncated away. Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-11-10Btrfs: Don't substract too much from the allocation target (avoid wrapping)Chris Mason
When metadata allocation clustering has to fall back to unclustered allocs because large free areas could not be found, it was sometimes substracting too much from the total bytes to allocate. This would make it wrap below zero. Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-11-07Btrfs: Avoid unplug storms during commitChris Mason
While doing a commit, btrfs makes sure all the metadata blocks were properly written to disk, calling wait_on_page_writeback for each page. This writeback happens after allowing another transaction to start, so it competes for the disk with other processes in the FS. If the page writeback bit is still set, each wait_on_page_writeback might trigger an unplug, even though the page might be waiting for checksumming to finish or might be waiting for the async work queue to submit the bio. This trades wait_on_page_writeback for waiting on the extent writeback bits. It won't trigger any unplugs and substantially improves performance in a number of workloads. This also changes the async bio submission to avoid requeueing if there is only one device. The requeue just wastes CPU time because there are no other devices to service. Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-11-07Btrfs: Fix more false enospc errors and an oops from empty clusteringChris Mason
In comes cases the empty cluster was added twice to the total number of bytes the allocator was trying to find. With empty clustering on, the hint byte was sometimes outside of the block group. Add an extra goto to find the correct block group. Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-11-07Btrfs: make sure compressed bios don't complete too soonChris Mason
When writing a compressed extent, a number of bios are created that point to a single struct compressed_bio. At end_io time an atomic counter in the compressed_bio struct makes sure that all of the bios have finished before final end_io processing is done. But when multiple bios are needed to write a compressed extent, the counter was being incremented after the first bio was sent to submit_bio. It is possible the bio will complete before the counter is incremented, making the end_io handler free the compressed_bio struct before processing is finished. The fix is to increment the atomic counter before bio submission, both for compressed reads and writes. Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-11-07Btfs: More metadata allocator optimizationsChris Mason
This lowers the empty cluster target for metadata allocations. The lower target makes it easier to do allocations and still seems to perform well. It also fixes the allocator loop to drop the empty cluster when things start getting difficult, avoiding false enospc warnings. Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-11-06Btrfs: enforce metadata allocation clusteringChris Mason
The allocator uses the last allocation as a starting point for metadata allocations, and tries to allocate in clusters of at least 256k. If the search for a free block fails to find the expected block, this patch forces a new cluster to be found in the free list. Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-11-06Btrfs: Optimize compressed writeback and readsChris Mason
When reading compressed extents, try to put pages into the page cache for any pages covered by the compressed extent that readpages didn't already preload. Add an async work queue to handle transformations at delayed allocation processing time. Right now this is just compression. The workflow is: 1) Find offsets in the file marked for delayed allocation 2) Lock the pages 3) Lock the state bits 4) Call the async delalloc code The async delalloc code clears the state lock bits and delalloc bits. It is important this happens before the range goes into the work queue because otherwise it might deadlock with other work queue items that try to lock those extent bits. The file pages are compressed, and if the compression doesn't work the pages are written back directly. An ordered work queue is used to make sure the inodes are written in the same order that pdflush or writepages sent them down. This changes extent_write_cache_pages to let the writepage function update the wbc nr_written count. Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-11-06Btrfs: Add ordered async work queuesChris Mason
Btrfs uses kernel threads to create async work queues for cpu intensive operations such as checksumming and decompression. These work well, but they make it difficult to keep IO order intact. A single writepages call from pdflush or fsync will turn into a number of bios, and each bio is checksummed in parallel. Once the checksum is computed, the bio is sent down to the disk, and since we don't control the order in which the parallel operations happen, they might go down to the disk in almost any order. The code deals with this somewhat by having deep work queues for a single kernel thread, making it very likely that a single thread will process all the bios for a single inode. This patch introduces an explicitly ordered work queue. As work structs are placed into the queue they are put onto the tail of a list. They have three callbacks: ->func (cpu intensive processing here) ->ordered_func (order sensitive processing here) ->ordered_free (free the work struct, all processing is done) The work struct has three callbacks. The func callback does the cpu intensive work, and when it completes the work struct is marked as done. Every time a work struct completes, the list is checked to see if the head is marked as done. If so the ordered_func callback is used to do the order sensitive processing and the ordered_free callback is used to do any cleanup. Then we loop back and check the head of the list again. This patch also changes the checksumming code to use the ordered workqueues. One a 4 drive array, it increases streaming writes from 280MB/s to 350MB/s. Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-10-31Btrfs: rev the disk format for fallocateChris Mason
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-10-31Btrfs: Compression corner fixesChris Mason
Make sure we keep page->mapping NULL on the pages we're getting via alloc_page. It gets set so a few of the callbacks can do the right thing, but in general these pages don't have a mapping. Don't try to truncate compressed inline items in btrfs_drop_extents. The whole compressed item must be preserved. Don't try to create multipage inline compressed items. When we try to overwrite just the first page of the file, we would have to read in and recow all the pages after it in the same compressed inline items. For now, only create single page inline items. Make sure we lock pages in the correct order during delalloc. The search into the state tree for delalloc bytes can return bytes before the page we already have locked. Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-10-30Btrfs: Add fallocate support v2Yan Zheng
This patch updates btrfs-progs for fallocate support. fallocate is a little different in Btrfs because we need to tell the COW system that a given preallocated extent doesn't need to be cow'd as long as there are no snapshots of it. This leverages the -o nodatacow checks. Signed-off-by: Yan Zheng <zheng.yan@oracle.com>
2008-10-30Btrfs: update nodatacow code v2Yan Zheng
This patch simplifies the nodatacow checker. If all references were created after the latest snapshot, then we can avoid COW safely. This patch also updates run_delalloc_nocow to do more fine-grained checking. Signed-off-by: Yan Zheng <zheng.yan@oracle.com>
2008-10-30Btrfs: Fix bookend extent race v2Yan Zheng
When dropping middle part of an extent, btrfs_drop_extents truncates the extent at first, then inserts a bookend extent. Since truncation and insertion can't be done atomically, there is a small period that the bookend extent isn't in the tree. This causes problem for functions that search the tree for file extent item. The way to fix this is lock the range of the bookend extent before truncation. Signed-off-by: Yan Zheng <zheng.yan@oracle.com>
2008-10-30Btrfs: update hole handling v2Yan Zheng
This patch splits the hole insertion code out of btrfs_setattr into btrfs_cont_expand and updates btrfs_get_extent to properly handle the case that file extent items are not continuous. Signed-off-by: Yan Zheng <zheng.yan@oracle.com>
2008-10-30Btrfs: Fix logic to avoid reading checksums for -o nodatasum,compressChris Mason
When compression was on, we were improperly ignoring -o nodatasum. This reworks the logic a bit to properly honor all the flags. Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-10-30Btrfs: walk compressed pages based on the nr_pages count instead of bytesChris Mason
The byte walk counting was awkward and error prone. This uses the number of pages sent the higher layer to build bios. Signed-off-by: Chris Mason <chris.mason@oracle.com>