diff options
| author | Gao Xiang <hsiangkao@linux.alibaba.com> | 2021-08-05 08:36:00 +0800 |
|---|---|---|
| committer | Gao Xiang <hsiangkao@linux.alibaba.com> | 2021-08-10 00:14:59 +0800 |
| commit | 06252e9ce05b94b587e522667b85848a30197b15 (patch) | |
| tree | 1c46bf38cff515dea5bc1399d3f6557986076b4e /fs/erofs/inode.c | |
| parent | a08e67a0280215f74eccf14fda81dd7fed6596ba (diff) | |
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/inode.c')
| -rw-r--r-- | fs/erofs/inode.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/fs/erofs/inode.c b/fs/erofs/inode.c index f296e1a2661e..92728da1d206 100644 --- a/fs/erofs/inode.c +++ b/fs/erofs/inode.c @@ -174,6 +174,10 @@ static struct page *erofs_read_inode(struct inode *inode, inode->i_mtime.tv_nsec = inode->i_ctime.tv_nsec; inode->i_atime.tv_nsec = inode->i_ctime.tv_nsec; + inode->i_flags &= ~S_DAX; + if (test_opt(&sbi->ctx, DAX_ALWAYS) && S_ISREG(inode->i_mode) && + vi->datalayout == EROFS_INODE_FLAT_PLAIN) + inode->i_flags |= S_DAX; if (!nblks) /* measure inode.i_blocks as generic filesystems */ inode->i_blocks = roundup(inode->i_size, EROFS_BLKSIZ) >> 9; |