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* Btrfs: don't clean old snapshots on sync(1)Chris Mason2009-02-12
| | | | | | | | | | | | | | Cleaning old snapshots can make sync(1) somewhat slow, and some users and applications still use it in a global fsync kind of workload. This patch changes btrfs not to clean old snapshots during sync, which is safe from a FS consistency point of view. The major downside is that it makes it difficult to tell when old snapshots have been reaped and the space they were using has been reclaimed. A new ioctl will be added for this purpose instead. Signed-off-by: Chris Mason <chris.mason@oracle.com>
* Btrfs: process mount options on mount -o remount,Chris Mason2009-02-12
| | | | | | | | Btrfs wasn't parsing any new mount options during remount, making it difficult to set mount options on a root drive. Signed-off-by: Chris Mason <chris.mason@oracle.com>
* Merge branch 'master' of ↵Chris Mason2009-01-28
|\ | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/mason/btrfs-unstable Fix fs/btrfs/super.c conflict around #includes
| * Btrfs: removed unused #include <version.h>'sHuang Weiyi2009-01-21
| | | | | | | | | | | | | | | | Removed unused #include <version.h>'s in btrfs Signed-off-by: Huang Weiyi <weiyi.huang@gmail.com> Signed-off-by: Chris Mason <chris.mason@oracle.com>
| * Btrfs: cleanup fs/btrfs/super.c::btrfs_control_ioctl()Wang Cong2009-01-21
| | | | | | | | | | | | | | | | | | - Remove the unused local variable 'len'; - Check return value of kmalloc(). Signed-off-by: Wang Cong <wangcong@zeuux.org> Signed-off-by: Chris Mason <chris.mason@oracle.com>
* | Merge git://git.kernel.org/pub/scm/linux/kernel/git/mason/btrfs-unstableLinus Torvalds2009-01-16
|\| | | | | | | | | | | * git://git.kernel.org/pub/scm/linux/kernel/git/mason/btrfs-unstable: Btrfs: fix ioctl arg size (userland incompatible change!) Btrfs: Clear the device->running_pending flag before bailing on congestion
| * Btrfs: fix ioctl arg size (userland incompatible change!)Chris Mason2009-01-16
| | | | | | | | | | | | | | | | | | | | | | | | | | | | The structure used to send device in btrfs ioctl calls was not properly aligned, and so 32 bit ioctls would not work properly on 64 bit kernels. We could fix this with compat ioctls, but we're just one byte away and it doesn't make sense at this stage to carry about the compat ioctls forever at this stage in the project. This patch brings the ioctl arg up to an evenly aligned 4k. Signed-off-by: Chris Mason <chris.mason@oracle.com>
* | btrfs & squashfs: Move btrfs and squashfsto's magic number to <linux/magic.h>Qinghuang Feng2009-01-15
| | | | | | | | | | | | | | | | | | | | Use the standard magic.h for btrfs and squashfs. Signed-off-by: Qinghuang Feng <qhfeng.kernel@gmail.com> Cc: Phillip Lougher <phillip@lougher.demon.co.uk> Cc: Chris Mason <chris.mason@oracle.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* | btrfs: fix for write_super_lockfs/unlockfs error handlingLinus Torvalds2009-01-10
|/ | | | | | | | | | Commit c4be0c1dc4cdc37b175579be1460f15ac6495e9a added the ability for write_super_lockfs to return errors, and renamed them to match. But btrfs didn't get converted. Do the minimal conversion to make it compile again. Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* Btrfs: Fix checkpatch.pl warningsChris Mason2009-01-05
| | | | | | | There were many, most are fixed now. struct-funcs.c generates some warnings but these are bogus. Signed-off-by: Chris Mason <chris.mason@oracle.com>
* Btrfs: fix a memory leak in btrfs_get_sbShen Feng2009-01-05
| | | | | | | subvol_name should be freed if error occurs. Signed-off-by: Shen Feng <shen@cn.fujitsu.com>
* Btrfs: add permission checks to the ioctlsChris Mason2009-01-05
| | | | | | | | | Only root can add/remove devices Only root can defrag subtrees Only files open for writing can be defragged Only files open for writing can be the destination for a clone Signed-off-by: Chris Mason <chris.mason@oracle.com>
* Btrfs: shared seed deviceYan Zheng2008-12-12
| | | | | | | | | | This patch makes seed device possible to be shared by multiple mounted file systems. The sharing is achieved by cloning seed device's btrfs_fs_devices structure. Thanks you, Signed-off-by: Yan Zheng <zheng.yan@oracle.com>
* Btrfs: corret fmode_t annotationsChristoph Hellwig2008-12-02
| | | | | | | | Make sure to propagate fmode_t properly and use the right constants for it. Signed-off-by: Christoph Hellwig <hch@lst.de>
* Btrfs: make things static and include the right headersChristoph Hellwig2008-12-02
| | | | | | | | Shut up various sparse warnings about symbols that should be either static or have their declarations in scope. Signed-off-by: Christoph Hellwig <hch@lst.de>
* Btrfs: compat code fixesChris Mason2008-11-20
| | | | | | | | The btrfs git kernel trees is used to build a standalone tree for compiling against older kernels. This commit makes the standalone tree work with 2.6.27 Signed-off-by: Chris Mason <chris.mason@oracle.com>
* Btrfs: Allow subvolumes and snapshots anywhere in the directory treeChris Mason2008-11-17
| | | | | | | | | | | | | | | | | | | | | | | | | | | | 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>
* Btrfs: Seed device supportYan Zheng2008-11-17
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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>
* Btrfs: mount ro and remount supportYan Zheng2008-11-12
| | | | | | | | | | | 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>
* Btrfs: Optimize compressed writeback and readsChris Mason2008-11-06
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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>
* Btrfs: Add zlib compression supportChris Mason2008-10-29
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This is a large change for adding compression on reading and writing, both for inline and regular extents. It does some fairly large surgery to the writeback paths. Compression is off by default and enabled by mount -o compress. Even when the -o compress mount option is not used, it is possible to read compressed extents off the disk. If compression for a given set of pages fails to make them smaller, the file is flagged to avoid future compression attempts later. * While finding delalloc extents, the pages are locked before being sent down to the delalloc handler. This allows the delalloc handler to do complex things such as cleaning the pages, marking them writeback and starting IO on their behalf. * Inline extents are inserted at delalloc time now. This allows us to compress the data before inserting the inline extent, and it allows us to insert an inline extent that spans multiple pages. * All of the in-memory extent representations (extent_map.c, ordered-data.c etc) are changed to record both an in-memory size and an on disk size, as well as a flag for compression. From a disk format point of view, the extent pointers in the file are changed to record the on disk size of a given extent and some encoding flags. Space in the disk format is allocated for compression encoding, as well as encryption and a generic 'other' field. Neither the encryption or the 'other' field are currently used. In order to limit the amount of data read for a single random read in the file, the size of a compressed extent is limited to 128k. This is a software only limit, the disk format supports u64 sized compressed extents. In order to limit the ram consumed while processing extents, the uncompressed size of a compressed extent is limited to 256k. This is a software only limit and will be subject to tuning later. Checksumming is still done on compressed extents, and it is done on the uncompressed version of the data. This way additional encodings can be layered on without having to figure out which encoding to checksum. Compression happens at delalloc time, which is basically singled threaded because it is usually done by a single pdflush thread. This makes it tricky to spread the compression load across all the cpus on the box. We'll have to look at parallel pdflush walks of dirty inodes at a later time. Decompression is hooked into readpages and it does spread across CPUs nicely. Signed-off-by: Chris Mason <chris.mason@oracle.com>
* Btrfs: add and improve commentsChris Mason2008-09-29
| | | | | | | | | | | This improves the comments at the top of many functions. It didn't dive into the guts of functions because I was trying to avoid merging problems with the new allocator and back reference work. extent-tree.c and volumes.c were both skipped, and there is definitely more work todo in cleaning and commenting the code. Signed-off-by: Chris Mason <chris.mason@oracle.com>
* Remove Btrfs compat code for older kernelsChris Mason2008-09-25
| | | | | | | | Btrfs had compatibility code for kernels back to 2.6.18. These have been removed, and will be maintained in a separate backport git tree from now on. Signed-off-by: Chris Mason <chris.mason@oracle.com>
* Btrfs: Reinstate '-osubvol=.' option to mount entire treeDavid Woodhouse2008-09-25
| | | | | | | | Date: Tue, 19 Aug 2008 16:49:35 +0100 This disappeared when I removed the special case for '.' in btrfs_lookup() Signed-off-by: David Woodhouse <David.Woodhouse@intel.com> Signed-off-by: Chris Mason <chris.mason@oracle.com>
* Mask root object ID into f_fsid in btrfs_statfs()David Woodhouse2008-09-25
| | | | | | | | | Date: Mon, 18 Aug 2008 13:10:20 +0100 This means that subvolumes get a different fsid, and NFS exporting them works properly. Signed-off-by: David Woodhouse <David.Woodhouse@intel.com> Signed-off-by: Chris Mason <chris.mason@oracle.com>
* Fill f_fsid field in btrfs_statfs()David Woodhouse2008-09-25
| | | | | | Date: Mon, 18 Aug 2008 12:01:52 +0100 Signed-off-by: David Woodhouse <David.Woodhouse@intel.com> Signed-off-by: Chris Mason <chris.mason@oracle.com>
* NFS support for btrfs - v3Balaji Rao2008-09-25
| | | | | | | | | | | | | | | | Date: Mon, 21 Jul 2008 02:01:56 +0530 Here's an implementation of NFS support for btrfs. It relies on the fixes which are going in to 2.6.28 for the NFS readdir/lookup deadlock. This uses the btrfs_iget helper introduced previously. [dwmw2: Tidy up a little, switch to d_obtain_alias() w/compat routine, change fh_type, store parent's root object ID where needed, fix some get_parent() and fs_to_dentry() bugs] Signed-off-by: Balaji Rao <balajirrao@gmail.com> Signed-off-by: David Woodhouse <David.Woodhouse@intel.com> Signed-off-by: Chris Mason <chris.mason@oracle.com>
* Btrfs: Various small fixes.Yan Zheng2008-09-25
| | | | | | | | This trivial patch contains two locking fixes and a off by one fix. --- Signed-off-by: Chris Mason <chris.mason@oracle.com>
* Btrfs: Add ACL supportJosef Bacik2008-09-25
| | | | Signed-off-by: Chris Mason <chris.mason@oracle.com>
* Btrfs: Add version strings on module loadChris Mason2008-09-25
| | | | Signed-off-by: Chris Mason <chris.mason@oracle.com>
* Btrfs: Online btree defragmentation fixesChris Mason2008-09-25
| | | | | | | | | | The btree defragger wasn't making forward progress because the new key wasn't being saved by the btrfs_search_forward function. This also disables the automatic btree defrag, it wasn't scaling well to huge filesystems. The auto-defrag needs to be done differently. Signed-off-by: Chris Mason <chris.mason@oracle.com>
* Btrfs: Replace the transaction work queue with kthreadsChris Mason2008-09-25
| | | | | | | This creates one kthread for commits and one kthread for deleting old snapshots. All the work queues are removed. Signed-off-by: Chris Mason <chris.mason@oracle.com>
* Btrfs: Replace the big fs_mutex with a collection of other locksChris Mason2008-09-25
| | | | | | | | Extent alloctions are still protected by a large alloc_mutex. Objectid allocations are covered by a objectid mutex Other btree operations are protected by a lock on individual btree nodes Signed-off-by: Chris Mason <chris.mason@oracle.com>
* Btrfs: Add a mount option to control worker thread pool sizeChris Mason2008-09-25
| | | | | | | | | | | | mount -o thread_pool_size changes the default, which is min(num_cpus + 2, 8). Larger thread pools would make more sense on very large disk arrays. This mount option controls the max size of each thread pool. There are multiple thread pools, so the total worker count will be larger than the mount option. Signed-off-by: Chris Mason <chris.mason@oracle.com>
* Btrfs: Fix mount -o max_inline=0Chris Mason2008-09-25
| | | | | | | | max_inline=0 used to force the max_inline size to one sector instead. Now it properly disables inline data items, while still being able to read any that happen to exist on disk. Signed-off-by: Chris Mason <chris.mason@oracle.com>
* btrfs: allow scanning multiple devices during mountChristoph Hellwig2008-09-25
| | | | | | | | | Allows to specify one or multiple device=/dev/foo options during mount so that ioctls on the control device can be avoided. Especially useful when trying to mount a multi-device setup as root. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Chris Mason <chris.mason@oracle.com>
* btrfs: sanity mount option parsing and early mount codeChristoph Hellwig2008-09-25
| | | | | | | Also adds lots of comments to describe what's going on here. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Chris Mason <chris.mason@oracle.com>
* Btrfs: transaction ioctlsSage Weil2008-09-25
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | These ioctls let a user application hold a transaction open while it performs a series of operations. A final ioctl does a sync on the fs (closing the current transaction). This is the main requirement for Ceph's OSD to be able to keep the data it's storing in a btrfs volume consistent, and AFAICS it works just fine. The application would do something like fd = ::open("some/file", O_RDONLY); ::ioctl(fd, BTRFS_IOC_TRANS_START); /* do a bunch of stuff */ ::ioctl(fd, BTRFS_IOC_TRANS_END); or just ::close(fd); And to ensure it commits to disk, ::ioctl(fd, BTRFS_IOC_SYNC); When a transaction is held open, the trans_handle is attached to the struct file (via private_data) so that it will get cleaned up if the process dies unexpectedly. A held transaction is also ended on fsync() to avoid a deadlock. A misbehaving application could also deliberately hold a transaction open, effectively locking up the FS, so it may make sense to restrict something like this to root or something. Signed-off-by: Chris Mason <chris.mason@oracle.com>
* btrfsctl -A error code fixupLinda Knippers2008-09-25
| | | | | | Send the error back to userland if the ioctl fails Signed-off-by: Chris Mason <chris.mason@oracle.com>
* btrfs delete ordered inode handling fixMingming2008-09-25
| | | | | | Use btrfs_release_file instead of a put_inode call Signed-off-by: Chris Mason <chris.mason@oracle.com>
* Btrfs: Add mount -o degraded to allow mounts to continue with missing devicesChris Mason2008-09-25
| | | | Signed-off-by: Chris Mason <chris.mason@oracle.com>
* Btrfs: Add support for online device removalChris Mason2008-09-25
| | | | | | | | | | | | | This required a few structural changes to the code that manages bdev pointers: The VFS super block now gets an anon-bdev instead of a pointer to the lowest bdev. This allows us to avoid swapping the super block bdev pointer around at run time. The code to read in the super block no longer goes through the extent buffer interface. Things got ugly keeping the mapping constant. Signed-off-by: Chris Mason <chris.mason@oracle.com>
* Btrfs: Add new ioctl to add devicesChris Mason2008-09-25
| | | | Signed-off-by: Chris Mason <chris.mason@oracle.com>
* Fix btrfs_fill_super to return -EINVAL when no FS foundYan2008-09-25
| | | | Signed-off-by: Chris Mason <chris.mason@oracle.com>
* Btrfs: Add support for device scanning and detection ioctlsChris Mason2008-09-25
| | | | Signed-off-by: Chris Mason <chris.mason@oracle.com>
* Add /dev/btrfs-control for device scanning ioctlsChris Mason2008-09-25
| | | | Signed-off-by: Chris Mason <chris.mason@oracle.com>
* Btrfs: Misc 2.6.25 updatesChris Mason2008-09-25
| | | | | | Remove the btrfs read_inode method, and use save_mount_options Signed-off-by: Chris Mason <chris.mason@oracle.com>
* Btrfs: mount -o max_inline=size to control the maximum inline extent sizeChris Mason2008-09-25
| | | | Signed-off-by: Chris Mason <chris.mason@oracle.com>
* Btrfs: Split the extent_map code into two partsChris Mason2008-09-25
| | | | | | | | | | | | | | There is now extent_map for mapping offsets in the file to disk and extent_io for state tracking, IO submission and extent_bufers. The new extent_map code shifts from [start,end] pairs to [start,len], and pushes the locking out into the caller. This allows a few performance optimizations and is easier to use. A number of extent_map usage bugs were fixed, mostly with failing to remove extent_map entries when changing the file. Signed-off-by: Chris Mason <chris.mason@oracle.com>
* Btrfs: Add basic lockfs callsYan2008-09-25
| | | | Signed-off-by: Chris Mason <chris.mason@oracle.com>
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