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btrfs: Allow to add new compression algorithm

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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 <lizf@cn.fujitsu.com>
This commit is contained in:
Li Zefan
2010-12-17 14:21:50 +08:00
parent 4b72029dc3
commit 261507a02c
15 changed files with 474 additions and 283 deletions
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8
fs/btrfs/ordered-data.h
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@ -68,7 +68,7 @@ struct btrfs_ordered_sum {
#define BTRFS_ORDERED_NOCOW 2 /* set when we want to write in place */
#define BTRFS_ORDERED_COMPRESSED 3 /* writing a compressed extent */
#define BTRFS_ORDERED_COMPRESSED 3 /* writing a zlib compressed extent */
#define BTRFS_ORDERED_PREALLOC 4 /* set when writing to prealloced extent */
@ -93,6 +93,9 @@ struct btrfs_ordered_extent {
/* flags (described above) */
unsigned long flags;
/* compression algorithm */
int compress_type;
/* reference count */
atomic_t refs;
@ -148,6 +151,9 @@ int btrfs_add_ordered_extent(struct inode *inode, u64 file_offset,
u64 start, u64 len, u64 disk_len, int type);
int btrfs_add_ordered_extent_dio(struct inode *inode, u64 file_offset,
u64 start, u64 len, u64 disk_len, int type);
int btrfs_add_ordered_extent_compress(struct inode *inode, u64 file_offset,
u64 start, u64 len, u64 disk_len,
int type, int compress_type);
int btrfs_add_ordered_sum(struct inode *inode,
struct btrfs_ordered_extent *entry,
struct btrfs_ordered_sum *sum);