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| author |  Jeffle Xu <jefflexu@linux.alibaba.com>
| 2022-04-25 20:21:32 +0800 |
|---|---|---|
| committer |  Gao Xiang <hsiangkao@linux.alibaba.com>
| 2022-05-18 00:11:19 +0800 |
| commit | 93b856bb5f66ae149ed91876b17c8c3fca576615 (patch) | |
| tree | 2167a51c26f000c812514a0e7044c23b4062296c /fs/erofs/internal.h | |
| parent | erofs: make erofs_map_blocks() generally available (diff) | |
| download | linux-93b856bb5f66ae149ed91876b17c8c3fca576615.tar.gz linux-93b856bb5f66ae149ed91876b17c8c3fca576615.tar.bz2 linux-93b856bb5f66ae149ed91876b17c8c3fca576615.zip | |
erofs: add fscache mode check helper
Until then erofs is exactly blockdev based filesystem.
A new fscache-based mode is going to be introduced for erofs to support
scenarios where on-demand read semantics is needed, e.g. container
image distribution. In this case, erofs could be mounted from data blobs
through fscache.
Add a helper checking which mode erofs works in, and twist the code in
preparation for the upcoming fscache mode.
Signed-off-by: Jeffle Xu <jefflexu@linux.alibaba.com>
Reviewed-by: Gao Xiang <hsiangkao@linux.alibaba.com>
Link: https://lore.kernel.org/r/20220425122143.56815-11-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/internal.h')
| -rw-r--r-- | fs/erofs/internal.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/fs/erofs/internal.h b/fs/erofs/internal.h index c83bd3965cb5..52911eaf36f6 100644 --- a/fs/erofs/internal.h +++ b/fs/erofs/internal.h @@ -161,6 +161,11 @@ struct erofs_sb_info { #define set_opt(opt, option) ((opt)->mount_opt |= EROFS_MOUNT_##option) #define test_opt(opt, option) ((opt)->mount_opt & EROFS_MOUNT_##option) +static inline bool erofs_is_fscache_mode(struct super_block *sb) +{ + return IS_ENABLED(CONFIG_EROFS_FS_ONDEMAND) && !sb->s_bdev; +} + enum { EROFS_ZIP_CACHE_DISABLED, EROFS_ZIP_CACHE_READAHEAD, |