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| author | Gao Xiang <hsiangkao@linux.alibaba.com> | 2021-08-05 03:36:00 +0300 |
|---|---|---|
| committer | Gao Xiang <hsiangkao@linux.alibaba.com> | 2021-08-09 19:14:59 +0300 |
| commit | 06252e9ce05b94b587e522667b85848a30197b15 (patch) | |
| tree | 1c46bf38cff515dea5bc1399d3f6557986076b4e /fs/erofs/internal.h | |
| parent | a08e67a0280215f74eccf14fda81dd7fed6596ba (diff) | |
| download | linux-06252e9ce05b94b587e522667b85848a30197b15.tar.xz | |
erofs: dax support for non-tailpacking regular file
DAX is quite useful for some VM use cases in order to save guest
memory extremely with minimal lightweight EROFS.
In order to prepare for such use cases, add preliminary dax support
for non-tailpacking regular files for now.
Tested with the DRAM-emulated PMEM and the EROFS image generated by
"mkfs.erofs -Enoinline_data enwik9.fsdax.img enwik9"
Link: https://lore.kernel.org/r/20210805003601.183063-3-hsiangkao@linux.alibaba.com
Cc: nvdimm@lists.linux.dev
Cc: linux-fsdevel@vger.kernel.org
Reviewed-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 | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/fs/erofs/internal.h b/fs/erofs/internal.h index 2669c785d548..7c9abfc93109 100644 --- a/fs/erofs/internal.h +++ b/fs/erofs/internal.h @@ -83,6 +83,7 @@ struct erofs_sb_info { struct erofs_sb_lz4_info lz4; #endif /* CONFIG_EROFS_FS_ZIP */ + struct dax_device *dax_dev; u32 blocks; u32 meta_blkaddr; #ifdef CONFIG_EROFS_FS_XATTR @@ -115,6 +116,8 @@ struct erofs_sb_info { /* Mount flags set via mount options or defaults */ #define EROFS_MOUNT_XATTR_USER 0x00000010 #define EROFS_MOUNT_POSIX_ACL 0x00000020 +#define EROFS_MOUNT_DAX_ALWAYS 0x00000040 +#define EROFS_MOUNT_DAX_NEVER 0x00000080 #define clear_opt(ctx, option) ((ctx)->mount_opt &= ~EROFS_MOUNT_##option) #define set_opt(ctx, option) ((ctx)->mount_opt |= EROFS_MOUNT_##option) |