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2008-09-25Add a min size parameter to btrfs_alloc_extentChris Mason
On huge machines, delayed allocation may try to allocate massive extents. This change allows btrfs_alloc_extent to return something smaller than the caller asked for, and the data allocation routines will loop over the allocations until it fills the whole delayed alloc. Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-09-25Btrfs: bio_endio support for linux 2.6.23 and older.Miguel
bio_endio() changed prototype on linux 2.6.24, support older kernels using the older prototype. Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-09-25Btrfs: define write_cache_pages for linux kernel <= 2.6.20 insteadMiguel
write_cache_pages doesn't exist in linux 2.6.20, change the #if condition to match that. Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-09-25Btrfs: Endianess bug fix for v0.13 with kernelsMiguel
Fix for a endianess BUG when using btrfs v0.13 with kernels older than 2.6.23 Problem: Has of v0.13, btrfs-progs is using crc32c.c equivalent to the one found on linux-2.6.23/lib/libcrc32c.c Since crc32c_le() changed in linux-2.6.23, when running btrfs v0.13 with older kernels we have a missmatch between the versions of crc32c_le() from btrfs-progs and libcrc32c in the kernel. This missmatch causes a bug when using btrfs on big endian machines. Solution: btrfs_crc32c() macro that when compiling for kernels older than 2.6.23, does endianess conversion to parameters and return value of crc32c(). This endianess conversion nullifies the differences in implementation of crc32c_le(). If kernel 2.6.23 or better, it calls crc32c(). Signed-off-by: Miguel Sousa Filipe <miguel.filipe@gmail.com> --- Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-09-25Btrfs: Fixup a few u64<->pointer casts for 32 bitChris Mason
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-09-25Btrfs: Add extra checks to avoid removing extent_state from pages we can't freeChris Mason
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-09-25Btrfs: Write out all super blocks on commit, and bring back proper barrier ↵Chris Mason
support Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-09-25Btrfs: Add O_DIRECT read and write (writes == buffered + cache flush)Chris Mason
This adds basic O_DIRECT read and write support. In the write case, we just do a normal buffered write followed by a cache flush. O_DIRECT + O_SYNC are required to trigger metadata syncs. In the read case, there is a basic btrfs_get_block call for use by the generic O_DIRECT code. This does honor multi-volume mapping rules but it skips all checksumming. Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-09-25Btrfs: Disable extra debugging checks on tree blocksChris Mason
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-09-25Btrfs: Handle checksumming errors while reading data blocksChris Mason
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-09-25Btrfs: Retry metadata reads in the face of checksum failuresChris Mason
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-09-25Btrfs: Handle data block end_io through the async work queueChris Mason
Before it was done by the bio end_io routine, the work queue code is able to scale much better with faster IO subsystems. Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-09-25Btrfs: Do metadata checksums for reads via a workqueueChris Mason
Before, metadata checksumming was done by the callers of read_tree_block, which would set EXTENT_CSUM bits in the extent tree to show that a given range of pages was already checksummed and didn't need to be verified again. But, those bits could go away via try_to_releasepage, and the end result was bogus checksum failures on pages that never left the cache. The new code validates checksums when the page is read. It is a little tricky because metadata blocks can span pages and a single read may end up going via multiple bios. Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-09-25Btrfs: Add additional debugging for metadata checksum failuresChris Mason
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-09-25Change btrfs_map_block to return a structure with mappings for all stripesChris Mason
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-09-25Btrfs: Fix allocation profile initChris Mason
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-09-25Btrfs: Don't allow written blocks from this transaction to be reallocatedChris Mason
When a block is freed, it can be immediately reused if it is from the current transaction. But, an extra check is required to make sure the block had not been written yet. If it were reused after being written, the transid in the block header might match the transid of the next time the block was allocated. The parent node records the transaction ID of the block it is pointing to, and this is used as part of validating the block on reads. So, there can only be one version of a block per transaction. Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-09-25Btrfs: Add support for duplicate blocks on a single spindleChris Mason
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-09-25Btrfs: Add support for mirroring across drivesChris Mason
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-09-25Btrfs: Properly dirty buffers in the split corner casesChris Mason
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-09-25Btrfs: Verify checksums on tree blocks found without read_tree_blockChris Mason
Checksums were only verified by btrfs_read_tree_block, which meant the functions to probe the page cache for blocks were not validating checksums. Normally this is fine because the buffers will only be in cache if they have already been validated. But, there is a window while the buffer is being read from disk where it could be up to date in the cache but not yet verified. This patch makes sure all buffers go through checksum verification before they are used. This is safer, and it prevents modification of buffers before they go through the csum code. Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-09-25Btrfs: Keep fs_mutex during reads done by snapshot deletionChris Mason
There was an optimization to drop the fs_mutex when doing snapshot deletion reads, but this can lead to false positives on checksumming errors. Keep the lock for now. Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-09-25btrfs-progs: Stop stomping on 'name' input parameterAlex Chiang
In btrfs_name_hash, Local variable 'buf' is declared as __u32 buf[2]; but we then try to do this: buf[0] = 0x67452301; buf[1] = 0xefcdab89; buf[2] = 0x98badcfe; buf[3] = 0x10325476; Oops. Fix buf to be the proper size. Signed-off-by: Alex Chiang <achiang@hp.com> Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-09-25Btrfs: Correct usage of IS_ERR() in extent_io.cPeter
Signed-off-by: Peter Teoh <htmldeveloper@gmail.com> Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-09-25Fix btrfs_fill_super to return -EINVAL when no FS foundYan
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-09-25Reorder the flags field in struct btrfs_header and record a flag on writeoutChris Mason
This allows detection of blocks that have already been written in the running transaction so they can be recowed instead of modified again. It is step one in trusting the transid field of the block pointers. Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-09-25Btrfs: Add leak debugging for extent_buffer and extent_stateChris Mason
This also fixes one leak around the super block when failing to mount the FS. Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-09-25Btrfs: Use a higher default ra pagesChris Mason
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-09-25Create a btrfs backing dev infoChris Mason
This allows intelligent versions of unplug and congestion functions Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-09-25Btrfs: Implement raid0 when multiple devices are presentChris Mason
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-09-25Btrfs: Add support for device scanning and detection ioctlsChris Mason
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-09-25Btrfs: Bring back mount -o ssd optimizationsChris Mason
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-09-25Btrfs: Move device information into the super block so it can be scannedChris Mason
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-09-25Btrfs: Make the FS tree the last objectid in the tree of tree rootsChris Mason
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-09-25Add /dev/btrfs-control for device scanning ioctlsChris Mason
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-09-25Btrfs: Bring back find_free_extent CPU usage optimizationsChris Mason
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-09-25Btrfs: Dynamic chunk and block group allocationChris Mason
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-09-25Btrfs: Add support for multiple devices per filesystemChris Mason
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-09-25Match the extent tree code to btrfs-progs for multi-device mergingChris Mason
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-09-25Btrfs: Use KM_USERN instead of KM_IRQ during data summingChris Mason
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-09-25Btrfs: Disable sysfs files on older kernelsChris Mason
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-09-25Btrfs: Make sure bio pages are adjacent during bulk csummingChris Mason
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-09-25Btrfs: Misc 2.6.25 updatesChris Mason
Remove the btrfs read_inode method, and use save_mount_options Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-09-25btrfs: fixes for kobject changes in mainlineGreg KH
Here's a patch against the unstable tree that gets the code to build against Linus's current tree (2.6.24-git12). This is needed as the kobject/kset api has changed there. I tried to make the smallest changes needed, and it builds and loads successfully, but I don't have a btrfs volume anywhere (yet) to try to see if things still work properly :) Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de> Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-09-25Btrfs: While doing checksums on bios, cache the extent_buffer mappingChris Mason
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-09-25Btrfs: checksum file data at bio submission time instead of during writepageChris Mason
When we checkum file data during writepage, the checksumming is done one page at a time, making it difficult to do bulk metadata modifications to insert checksums for large ranges of the file at once. This patch changes btrfs to checksum on a per-bio basis instead. The bios are checksummed before they are handed off to the block layer, so each bio is contiguous and only has pages from the same inode. Checksumming on a bio basis allows us to insert and modify the file checksum items in large groups. It also allows the checksumming to be done more easily by async worker threads. Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-09-25Btrfs: Properly cast before shiftingChris Mason
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-09-25Btrfs: Take the extent lock before dropping the delalloc bitsChris Mason
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-09-25Btrfs: Fix looping on readdir of the subvol rootsYan Zheng
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-09-25Btrfs: Properly clear dirty and delalloc extent bits while preparing the ↵Chris Mason
file for write Yan Zheng noticed that we don't clear the extent state tree dirty and delalloc bits when we clear the dirty bits on the page during file write. This leads to csum errors later on. Signed-off-by: Chris Mason <chris.mason@oracle.com>
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