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authorChris Mason <chris.mason@oracle.com>2008-10-29 14:49:59 -0400
committerChris Mason <chris.mason@oracle.com>2008-10-29 14:49:59 -0400
commitc8b978188c9a0fd3d535c13debd19d522b726f1f (patch)
tree873628723fb82fe2a7c77adc65fa93eca1d61c0c /fs/btrfs/ordered-data.h
parent26ce34a9c47334ff7984769e4661b2f1883594ff (diff)
Btrfs: Add zlib compression support
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>
Diffstat (limited to 'fs/btrfs/ordered-data.h')
-rw-r--r--fs/btrfs/ordered-data.h10
1 files changed, 8 insertions, 2 deletions
diff --git a/fs/btrfs/ordered-data.h b/fs/btrfs/ordered-data.h
index f50f8870a14..1ef464145d2 100644
--- a/fs/btrfs/ordered-data.h
+++ b/fs/btrfs/ordered-data.h
@@ -66,6 +66,8 @@ 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 */
+
struct btrfs_ordered_extent {
/* logical offset in the file */
u64 file_offset;
@@ -73,9 +75,12 @@ struct btrfs_ordered_extent {
/* disk byte number */
u64 start;
- /* length of the extent in bytes */
+ /* ram length of the extent in bytes */
u64 len;
+ /* extent length on disk */
+ u64 disk_len;
+
/* flags (described above) */
unsigned long flags;
@@ -127,7 +132,8 @@ int btrfs_remove_ordered_extent(struct inode *inode,
int btrfs_dec_test_ordered_pending(struct inode *inode,
u64 file_offset, u64 io_size);
int btrfs_add_ordered_extent(struct inode *inode, u64 file_offset,
- u64 start, u64 len, int nocow);
+ u64 start, u64 len, u64 disk_len, int nocow,
+ int compressed);
int btrfs_add_ordered_sum(struct inode *inode,
struct btrfs_ordered_extent *entry,
struct btrfs_ordered_sum *sum);