kernel.git/fs/btrfs/extent_map.h, branch linux-3.4.y

btrfs: fix structs where bitfields and spinlock/atomic share 8B word

2012-02-15T15:40:25Z

On ia64, powerpc64 and sparc64 the bitfield is modified through a RMW cycle and current gcc rewrites the adjacent 4B word, which in case of a spinlock or atomic has disaterous effect. https://lkml.org/lkml/2012/2/1/220 Signed-off-by: David Sterba

btrfs: drop gfp parameter from alloc_extent_map

2011-05-02T11:57:21Z

pass GFP_NOFS directly to kmem_cache_alloc Signed-off-by: David Sterba

btrfs: drop unused parameter from extent_map_tree_init

2011-05-02T11:57:21Z

the GFP flags are not stored anywhere and all allocations are done via alloc_extent_map(GFP_NOFS). Signed-off-by: David Sterba

btrfs: Allow to add new compression algorithm

2010-12-22T15:15:45Z

Make the code aware of compression type, instead of always assuming zlib compression. Also make the zlib workspace function as common code for all compression types. Signed-off-by: Li Zefan

Btrfs: search for an allocation hint while filling file COW

2009-09-18T20:08:52Z

The allocator has some nice knobs for sending hints about where to try and allocate new blocks, but when we're doing file allocations we're not sending any hint at all. This commit adds a simple extent map search to see if we can quickly and easily find a hint for the allocator. Signed-off-by: Chris Mason

Btrfs: Fix extent replacment race

2009-09-11T17:31:07Z

Data COW means that whenever we write to a file, we replace any old extent pointers with new ones. There was a window where a readpage might find the old extent pointers on disk and cache them in the extent_map tree in ram in the middle of a given write replacing them. Even though both the readpage and the write had their respective bytes in the file locked, the extent readpage inserts may cover more bytes than it had locked down. This commit closes the race by keeping the new extent pinned in the extent map tree until after the on-disk btree is properly setup with the new extent pointers. Signed-off-by: Chris Mason

Btrfs: switch extent_map to a rw lock

2009-09-11T17:31:05Z

There are two main users of the extent_map tree. The first is regular file inodes, where it is evenly spread between readers and writers. The second is the chunk allocation tree, which maps blocks from logical addresses to phyiscal ones, and it is 99.99% reads. The mapping tree is a point of lock contention during heavy IO workloads, so this commit switches things to a rw lock. Signed-off-by: Chris Mason

Btrfs: Fix csum error for compressed data

2008-11-10T12:34:43Z

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

Btrfs: Add fallocate support v2

2008-10-30T18:25:28Z

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

Btrfs: update hole handling v2

2008-10-30T18:19:41Z

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