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| author |  Jeffle Xu <jefflexu@linux.alibaba.com>
| 2022-04-25 20:21:34 +0800 |
|---|---|---|
| committer |  Gao Xiang <hsiangkao@linux.alibaba.com>
| 2022-05-18 00:11:19 +0800 |
| commit | b02c602f065f7a09d7678dd1d8bf3d3fd10ed228 (patch) | |
| tree | 81979efd9a1a5b95a74e0253537787d38e15bd59 /fs/erofs | |
| parent | erofs: register fscache volume (diff) | |
| download | linux-b02c602f065f7a09d7678dd1d8bf3d3fd10ed228.tar.gz linux-b02c602f065f7a09d7678dd1d8bf3d3fd10ed228.tar.bz2 linux-b02c602f065f7a09d7678dd1d8bf3d3fd10ed228.zip | |
erofs: add fscache context helper functions
Introduce a context structure for managing data blobs, and helper
functions for initializing and cleaning up this context structure.
Signed-off-by: Jeffle Xu <jefflexu@linux.alibaba.com>
Reviewed-by: Gao Xiang <hsiangkao@linux.alibaba.com>
Link: https://lore.kernel.org/r/20220425122143.56815-13-jefflexu@linux.alibaba.com
Acked-by: Chao Yu <chao@kernel.org>
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>
Diffstat (limited to 'fs/erofs')
| -rw-r--r-- | fs/erofs/fscache.c | 41 | ||||
| -rw-r--r-- | fs/erofs/internal.h | 19 |
2 files changed, 60 insertions, 0 deletions
diff --git a/fs/erofs/fscache.c b/fs/erofs/fscache.c index 7a6d0239ebb1..dfff245b006b 100644 --- a/fs/erofs/fscache.c +++ b/fs/erofs/fscache.c @@ -5,6 +5,47 @@ #include <linux/fscache.h> #include "internal.h" +int erofs_fscache_register_cookie(struct super_block *sb, + struct erofs_fscache **fscache, char *name) +{ + struct fscache_volume *volume = EROFS_SB(sb)->volume; + struct erofs_fscache *ctx; + struct fscache_cookie *cookie; + + ctx = kzalloc(sizeof(*ctx), GFP_KERNEL); + if (!ctx) + return -ENOMEM; + + cookie = fscache_acquire_cookie(volume, FSCACHE_ADV_WANT_CACHE_SIZE, + name, strlen(name), NULL, 0, 0); + if (!cookie) { + erofs_err(sb, "failed to get cookie for %s", name); + kfree(name); + return -EINVAL; + } + + fscache_use_cookie(cookie, false); + ctx->cookie = cookie; + + *fscache = ctx; + return 0; +} + +void erofs_fscache_unregister_cookie(struct erofs_fscache **fscache) +{ + struct erofs_fscache *ctx = *fscache; + + if (!ctx) + return; + + fscache_unuse_cookie(ctx->cookie, NULL, NULL); + fscache_relinquish_cookie(ctx->cookie, false); + ctx->cookie = NULL; + + kfree(ctx); + *fscache = NULL; +} + int erofs_fscache_register_fs(struct super_block *sb) { struct erofs_sb_info *sbi = EROFS_SB(sb); diff --git a/fs/erofs/internal.h b/fs/erofs/internal.h index 71c28aa3f9ce..0997c297863f 100644 --- a/fs/erofs/internal.h +++ b/fs/erofs/internal.h @@ -97,6 +97,10 @@ struct erofs_sb_lz4_info { u16 max_pclusterblks; }; +struct erofs_fscache { + struct fscache_cookie *cookie; +}; + struct erofs_sb_info { struct erofs_mount_opts opt; /* options */ #ifdef CONFIG_EROFS_FS_ZIP @@ -601,12 +605,27 @@ static inline int z_erofs_load_lzma_config(struct super_block *sb, #ifdef CONFIG_EROFS_FS_ONDEMAND int erofs_fscache_register_fs(struct super_block *sb); void erofs_fscache_unregister_fs(struct super_block *sb); + +int erofs_fscache_register_cookie(struct super_block *sb, + struct erofs_fscache **fscache, char *name); +void erofs_fscache_unregister_cookie(struct erofs_fscache **fscache); #else static inline int erofs_fscache_register_fs(struct super_block *sb) { return 0; } static inline void erofs_fscache_unregister_fs(struct super_block *sb) {} + +static inline int erofs_fscache_register_cookie(struct super_block *sb, + struct erofs_fscache **fscache, + char *name) +{ + return -EOPNOTSUPP; +} + +static inline void erofs_fscache_unregister_cookie(struct erofs_fscache **fscache) +{ +} #endif #define EFSCORRUPTED EUCLEAN /* Filesystem is corrupted */ |