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| author | Chao Yu <yuchao0@huawei.com> | 2017-07-19 00:19:06 +0800 |
|---|---|---|
| committer | Jaegeuk Kim <jaegeuk@kernel.org> | 2017-07-31 16:48:30 -0700 |
| commit | 7a2af766af15887754f7f7a0869b4603b390876a (patch) | |
| tree | de8a83f7499d1b278b1e8e5423fbdabc73daea12 /fs/f2fs/namei.c | |
| parent | f247037120ecd3dcbbc196b51ded8b57edf4904f (diff) | |
| download | linux-7a2af766af15887754f7f7a0869b4603b390876a.tar.bz2 | |
f2fs: enhance on-disk inode structure scalability
This patch add new flag F2FS_EXTRA_ATTR storing in inode.i_inline
to indicate that on-disk structure of current inode is extended.
In order to extend, we changed the inode structure a bit:
Original one:
struct f2fs_inode {
...
struct f2fs_extent i_ext;
__le32 i_addr[DEF_ADDRS_PER_INODE];
__le32 i_nid[DEF_NIDS_PER_INODE];
}
Extended one:
struct f2fs_inode {
...
struct f2fs_extent i_ext;
union {
struct {
__le16 i_extra_isize;
__le16 i_padding;
__le32 i_extra_end[0];
};
__le32 i_addr[DEF_ADDRS_PER_INODE];
};
__le32 i_nid[DEF_NIDS_PER_INODE];
}
Once F2FS_EXTRA_ATTR is set, we will steal four bytes in the head of
i_addr field for storing i_extra_isize and i_padding. with i_extra_isize,
we can calculate actual size of reserved space in i_addr, available
attribute fields included in total extra attribute fields for current
inode can be described as below:
+--------------------+
| .i_mode |
| ... |
| .i_ext |
+--------------------+
| .i_extra_isize |-----+
| .i_padding | |
| .i_prjid | |
| .i_atime_extra | |
| .i_ctime_extra | |
| .i_mtime_extra |<----+
| .i_inode_cs |<----- store blkaddr/inline from here
| .i_xattr_cs |
| ... |
+--------------------+
| |
| block address |
| |
+--------------------+
| .i_nid |
+--------------------+
| node_footer |
| (nid, ino, offset) |
+--------------------+
Hence, with this patch, we would enhance scalability of f2fs inode for
storing more newly added attribute.
Signed-off-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Diffstat (limited to 'fs/f2fs/namei.c')
| -rw-r--r-- | fs/f2fs/namei.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/fs/f2fs/namei.c b/fs/f2fs/namei.c index 760d85223c81..26b4d2b54812 100644 --- a/fs/f2fs/namei.c +++ b/fs/f2fs/namei.c @@ -72,6 +72,11 @@ static struct inode *f2fs_new_inode(struct inode *dir, umode_t mode) set_inode_flag(inode, FI_NEW_INODE); + if (f2fs_sb_has_extra_attr(sbi->sb)) { + set_inode_flag(inode, FI_EXTRA_ATTR); + F2FS_I(inode)->i_extra_isize = F2FS_TOTAL_EXTRA_ATTR_SIZE; + } + if (test_opt(sbi, INLINE_XATTR)) set_inode_flag(inode, FI_INLINE_XATTR); if (test_opt(sbi, INLINE_DATA) && f2fs_may_inline_data(inode)) |