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btrfs: export compression buffer limits in a header

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Move the buffer limit definitions out of compress_file_range.

Reviewed-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
David Sterba 2017-02-14 19:30:39 +01:00
parent 4d3a800ebb
commit ff7638665c
2 changed files with 15 additions and 10 deletions
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15
fs/btrfs/compression.h
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@ -19,6 +19,21 @@
#ifndef __BTRFS_COMPRESSION_
#define __BTRFS_COMPRESSION_
/*
* We want to make sure that amount of RAM required to uncompress an extent is
* reasonable, so we limit the total size in ram of a compressed extent to
* 128k. This is a crucial number because it also controls how easily we can
* spread reads across cpus for decompression.
*
* We also want to make sure the amount of IO required to do a random read is
* reasonably small, so we limit the size of a compressed extent to 128k.
*/
/* Maximum length of compressed data stored on disk */
#define BTRFS_MAX_COMPRESSED (SZ_128K)
/* Maximum size of data before compression */
#define BTRFS_MAX_UNCOMPRESSED (SZ_128K)
void btrfs_init_compress(void);
void btrfs_exit_compress(void);