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path: root/fs/btrfs/raid56.c
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2013-05-18Btrfs: use a btrfs bioset instead of abusing bio internalsChris Mason
Btrfs has been pointer tagging bi_private and using bi_bdev to store the stripe index and mirror number of failed IOs. As bios bubble back up through the call chain, we use these to decide if and how to retry our IOs. They are also used to count IO failures on a per device basis. Recently a bio tracepoint was added lead to crashes because we were abusing bi_bdev. This commit adds a btrfs bioset, and creates explicit fields for the mirror number and stripe index. The plan is to extend this structure for all of the fields currently in struct btrfs_bio, which will mean one less kmalloc in our IO path. Signed-off-by: Chris Mason <chris.mason@fusionio.com> Reported-by: Tejun Heo <tj@kernel.org>
2013-05-06btrfs: make static code static & remove dead codeEric Sandeen
Big patch, but all it does is add statics to functions which are in fact static, then remove the associated dead-code fallout. removed functions: btrfs_iref_to_path() __btrfs_lookup_delayed_deletion_item() __btrfs_search_delayed_insertion_item() __btrfs_search_delayed_deletion_item() find_eb_for_page() btrfs_find_block_group() range_straddles_pages() extent_range_uptodate() btrfs_file_extent_length() btrfs_scrub_cancel_devid() btrfs_start_transaction_lflush() btrfs_print_tree() is left because it is used for debugging. btrfs_start_transaction_lflush() and btrfs_reada_detach() are left for symmetry. ulist.c functions are left, another patch will take care of those. Signed-off-by: Eric Sandeen <sandeen@redhat.com> Signed-off-by: Josef Bacik <jbacik@fusionio.com>
2013-03-03btrfs/raid56: Add missing #include <linux/vmalloc.h>Geert Uytterhoeven
tilegx_defconfig: fs/btrfs/raid56.c: In function 'btrfs_alloc_stripe_hash_table': fs/btrfs/raid56.c:206:3: error: implicit declaration of function 'vzalloc' [-Werror=implicit-function-declaration] fs/btrfs/raid56.c:206:9: warning: assignment makes pointer from integer without a cast [enabled by default] fs/btrfs/raid56.c:226:4: error: implicit declaration of function 'vfree' [-Werror=implicit-function-declaration] Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org> Signed-off-by: Chris Mason <chris.mason@fusionio.com>
2013-03-01btrfs: try harder to allocate raid56 stripe cacheDavid Sterba
The stripe hash table is large, starting with allocation order 4 and can go as high as order 7 in case lock debugging is turned on and structure padding happens. Observed mount failure: mount: page allocation failure: order:7, mode:0x200050 Pid: 8234, comm: mount Tainted: G W 3.8.0-default+ #267 Call Trace: [<ffffffff81114353>] warn_alloc_failed+0xf3/0x140 [<ffffffff811171d2>] ? __alloc_pages_direct_compact+0x92/0x250 [<ffffffff81117ac3>] __alloc_pages_nodemask+0x733/0x9d0 [<ffffffff81152878>] ? cache_alloc_refill+0x3f8/0x840 [<ffffffff811528bc>] cache_alloc_refill+0x43c/0x840 [<ffffffff811302eb>] ? is_kernel_percpu_address+0x4b/0x90 [<ffffffffa00a00ac>] ? btrfs_alloc_stripe_hash_table+0x5c/0x130 [btrfs] [<ffffffff811531d7>] kmem_cache_alloc_trace+0x247/0x270 [<ffffffffa00a00ac>] btrfs_alloc_stripe_hash_table+0x5c/0x130 [btrfs] [<ffffffffa003133f>] open_ctree+0xb2f/0x1f90 [btrfs] [<ffffffff81397289>] ? string+0x49/0xe0 [<ffffffff813987b3>] ? vsnprintf+0x443/0x5d0 [<ffffffffa0007cb6>] btrfs_mount+0x526/0x600 [btrfs] [<ffffffff8115127c>] ? cache_alloc_debugcheck_after+0x4c/0x200 [<ffffffff81162b90>] mount_fs+0x20/0xe0 [<ffffffff8117db26>] vfs_kern_mount+0x76/0x120 [<ffffffff811801b6>] do_mount+0x386/0x980 [<ffffffff8112a5cb>] ? strndup_user+0x5b/0x80 [<ffffffff81180840>] sys_mount+0x90/0xe0 [<ffffffff81962e99>] system_call_fastpath+0x16/0x1b Signed-off-by: David Sterba <dsterba@suse.cz> Signed-off-by: Josef Bacik <jbacik@fusionio.com>
2013-02-01Btrfs: add a plugging callback to raid56 writesChris Mason
Buffered writes and DIRECT_IO writes will often break up big contiguous changes to the file into sub-stripe writes. This adds a plugging callback to gather those smaller writes full stripe writes. Example on flash: fio job to do 64K writes in batches of 3 (which makes a full stripe): With plugging: 450MB/s Without plugging: 220MB/s Signed-off-by: Chris Mason <chris.mason@fusionio.com>
2013-02-01Btrfs: Add a stripe cache to raid56Chris Mason
The stripe cache allows us to avoid extra read/modify/write cycles by caching the pages we read off the disk. Pages are cached when: * They are read in during a read/modify/write cycle * They are written during a read/modify/write cycle * They are involved in a parity rebuild Pages are not cached if we're doing a full stripe write. We're assuming that a full stripe write won't be followed by another partial stripe write any time soon. This provides a substantial boost in performance for workloads that synchronously modify adjacent offsets in the file, and for the parity rebuild use case in general. The size of the stripe cache isn't tunable (yet) and is set at 1024 entries. Example on flash: dd if=/dev/zero of=/mnt/xxx bs=4K oflag=direct Without the stripe cache -- 2.1MB/s With the stripe cache 21MB/s Signed-off-by: Chris Mason <chris.mason@fusionio.com>
2013-02-01Btrfs: RAID5 and RAID6David Woodhouse
This builds on David Woodhouse's original Btrfs raid5/6 implementation. The code has changed quite a bit, blame Chris Mason for any bugs. Read/modify/write is done after the higher levels of the filesystem have prepared a given bio. This means the higher layers are not responsible for building full stripes, and they don't need to query for the topology of the extents that may get allocated during delayed allocation runs. It also means different files can easily share the same stripe. But, it does expose us to incorrect parity if we crash or lose power while doing a read/modify/write cycle. This will be addressed in a later commit. Scrub is unable to repair crc errors on raid5/6 chunks. Discard does not work on raid5/6 (yet) The stripe size is fixed at 64KiB per disk. This will be tunable in a later commit. Signed-off-by: Chris Mason <chris.mason@fusionio.com>