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181 lines
6.0 KiB
181 lines
6.0 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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/* |
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* Copyright (C) 2008 Oracle. All rights reserved. |
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*/ |
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#ifndef BTRFS_COMPRESSION_H |
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#define BTRFS_COMPRESSION_H |
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#include <linux/sizes.h> |
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struct btrfs_inode; |
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/* |
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* We want to make sure that amount of RAM required to uncompress an extent is |
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* reasonable, so we limit the total size in ram of a compressed extent to |
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* 128k. This is a crucial number because it also controls how easily we can |
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* spread reads across cpus for decompression. |
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* |
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* We also want to make sure the amount of IO required to do a random read is |
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* reasonably small, so we limit the size of a compressed extent to 128k. |
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*/ |
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/* Maximum length of compressed data stored on disk */ |
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#define BTRFS_MAX_COMPRESSED (SZ_128K) |
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/* Maximum size of data before compression */ |
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#define BTRFS_MAX_UNCOMPRESSED (SZ_128K) |
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#define BTRFS_ZLIB_DEFAULT_LEVEL 3 |
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struct compressed_bio { |
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/* number of bios pending for this compressed extent */ |
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refcount_t pending_bios; |
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/* Number of compressed pages in the array */ |
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unsigned int nr_pages; |
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/* the pages with the compressed data on them */ |
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struct page **compressed_pages; |
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/* inode that owns this data */ |
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struct inode *inode; |
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/* starting offset in the inode for our pages */ |
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u64 start; |
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/* Number of bytes in the inode we're working on */ |
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unsigned int len; |
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/* Number of bytes on disk */ |
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unsigned int compressed_len; |
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/* The compression algorithm for this bio */ |
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u8 compress_type; |
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/* IO errors */ |
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u8 errors; |
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int mirror_num; |
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/* for reads, this is the bio we are copying the data into */ |
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struct bio *orig_bio; |
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/* |
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* the start of a variable length array of checksums only |
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* used by reads |
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*/ |
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u8 sums[]; |
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}; |
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static inline unsigned int btrfs_compress_type(unsigned int type_level) |
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{ |
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return (type_level & 0xF); |
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} |
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static inline unsigned int btrfs_compress_level(unsigned int type_level) |
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{ |
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return ((type_level & 0xF0) >> 4); |
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} |
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void __init btrfs_init_compress(void); |
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void __cold btrfs_exit_compress(void); |
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int btrfs_compress_pages(unsigned int type_level, struct address_space *mapping, |
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u64 start, struct page **pages, |
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unsigned long *out_pages, |
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unsigned long *total_in, |
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unsigned long *total_out); |
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int btrfs_decompress(int type, unsigned char *data_in, struct page *dest_page, |
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unsigned long start_byte, size_t srclen, size_t destlen); |
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int btrfs_decompress_buf2page(const char *buf, u32 buf_len, |
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struct compressed_bio *cb, u32 decompressed); |
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blk_status_t btrfs_submit_compressed_write(struct btrfs_inode *inode, u64 start, |
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unsigned int len, u64 disk_start, |
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unsigned int compressed_len, |
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struct page **compressed_pages, |
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unsigned int nr_pages, |
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unsigned int write_flags, |
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struct cgroup_subsys_state *blkcg_css); |
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blk_status_t btrfs_submit_compressed_read(struct inode *inode, struct bio *bio, |
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int mirror_num, unsigned long bio_flags); |
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unsigned int btrfs_compress_str2level(unsigned int type, const char *str); |
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enum btrfs_compression_type { |
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BTRFS_COMPRESS_NONE = 0, |
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BTRFS_COMPRESS_ZLIB = 1, |
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BTRFS_COMPRESS_LZO = 2, |
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BTRFS_COMPRESS_ZSTD = 3, |
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BTRFS_NR_COMPRESS_TYPES = 4, |
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}; |
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struct workspace_manager { |
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struct list_head idle_ws; |
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spinlock_t ws_lock; |
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/* Number of free workspaces */ |
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int free_ws; |
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/* Total number of allocated workspaces */ |
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atomic_t total_ws; |
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/* Waiters for a free workspace */ |
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wait_queue_head_t ws_wait; |
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}; |
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struct list_head *btrfs_get_workspace(int type, unsigned int level); |
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void btrfs_put_workspace(int type, struct list_head *ws); |
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struct btrfs_compress_op { |
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struct workspace_manager *workspace_manager; |
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/* Maximum level supported by the compression algorithm */ |
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unsigned int max_level; |
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unsigned int default_level; |
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}; |
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/* The heuristic workspaces are managed via the 0th workspace manager */ |
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#define BTRFS_NR_WORKSPACE_MANAGERS BTRFS_NR_COMPRESS_TYPES |
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extern const struct btrfs_compress_op btrfs_heuristic_compress; |
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extern const struct btrfs_compress_op btrfs_zlib_compress; |
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extern const struct btrfs_compress_op btrfs_lzo_compress; |
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extern const struct btrfs_compress_op btrfs_zstd_compress; |
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const char* btrfs_compress_type2str(enum btrfs_compression_type type); |
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bool btrfs_compress_is_valid_type(const char *str, size_t len); |
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int btrfs_compress_heuristic(struct inode *inode, u64 start, u64 end); |
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int zlib_compress_pages(struct list_head *ws, struct address_space *mapping, |
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u64 start, struct page **pages, unsigned long *out_pages, |
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unsigned long *total_in, unsigned long *total_out); |
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int zlib_decompress_bio(struct list_head *ws, struct compressed_bio *cb); |
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int zlib_decompress(struct list_head *ws, unsigned char *data_in, |
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struct page *dest_page, unsigned long start_byte, size_t srclen, |
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size_t destlen); |
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struct list_head *zlib_alloc_workspace(unsigned int level); |
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void zlib_free_workspace(struct list_head *ws); |
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struct list_head *zlib_get_workspace(unsigned int level); |
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int lzo_compress_pages(struct list_head *ws, struct address_space *mapping, |
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u64 start, struct page **pages, unsigned long *out_pages, |
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unsigned long *total_in, unsigned long *total_out); |
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int lzo_decompress_bio(struct list_head *ws, struct compressed_bio *cb); |
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int lzo_decompress(struct list_head *ws, unsigned char *data_in, |
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struct page *dest_page, unsigned long start_byte, size_t srclen, |
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size_t destlen); |
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struct list_head *lzo_alloc_workspace(unsigned int level); |
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void lzo_free_workspace(struct list_head *ws); |
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int zstd_compress_pages(struct list_head *ws, struct address_space *mapping, |
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u64 start, struct page **pages, unsigned long *out_pages, |
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unsigned long *total_in, unsigned long *total_out); |
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int zstd_decompress_bio(struct list_head *ws, struct compressed_bio *cb); |
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int zstd_decompress(struct list_head *ws, unsigned char *data_in, |
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struct page *dest_page, unsigned long start_byte, size_t srclen, |
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size_t destlen); |
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void zstd_init_workspace_manager(void); |
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void zstd_cleanup_workspace_manager(void); |
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struct list_head *zstd_alloc_workspace(unsigned int level); |
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void zstd_free_workspace(struct list_head *ws); |
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struct list_head *zstd_get_workspace(unsigned int level); |
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void zstd_put_workspace(struct list_head *ws); |
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#endif
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