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| author | Theodore Ts'o <tytso@mit.edu> | 2020-06-11 10:51:44 -0400 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2020-06-11 10:51:44 -0400 |
| commit | 68cd44920d2ccf32dea1502e71dc0175c9663af1 (patch) | |
| tree | 2ced523b89936fe9bca0c37e77c31566ea33f917 /fs/ext4/inode.c | |
| parent | 6b8ed62008a49751fc71fefd2a4f89202a7c2d4d (diff) | |
| parent | 15ee65676f1e2bbb237e9ecd317b45d8eba29237 (diff) | |
| download | linux-68cd44920d2ccf32dea1502e71dc0175c9663af1.tar.bz2 | |
Enable ext4 support for per-file/directory dax operations
This adds the same per-file/per-directory DAX support for ext4 as was
done for xfs, now that we finally have consensus over what the
interface should be.
Diffstat (limited to 'fs/ext4/inode.c')
| -rw-r--r-- | fs/ext4/inode.c | 26 |
1 files changed, 20 insertions, 6 deletions
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c index 6694f0c8e0f7..1556cabd3a7d 100644 --- a/fs/ext4/inode.c +++ b/fs/ext4/inode.c @@ -4406,9 +4406,11 @@ int ext4_get_inode_loc(struct inode *inode, struct ext4_iloc *iloc) !ext4_test_inode_state(inode, EXT4_STATE_XATTR)); } -static bool ext4_should_use_dax(struct inode *inode) +static bool ext4_should_enable_dax(struct inode *inode) { - if (!test_opt(inode->i_sb, DAX)) + struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); + + if (test_opt2(inode->i_sb, DAX_NEVER)) return false; if (!S_ISREG(inode->i_mode)) return false; @@ -4420,14 +4422,21 @@ static bool ext4_should_use_dax(struct inode *inode) return false; if (ext4_test_inode_flag(inode, EXT4_INODE_VERITY)) return false; - return true; + if (!test_bit(EXT4_FLAGS_BDEV_IS_DAX, &sbi->s_ext4_flags)) + return false; + if (test_opt(inode->i_sb, DAX_ALWAYS)) + return true; + + return ext4_test_inode_flag(inode, EXT4_INODE_DAX); } -void ext4_set_inode_flags(struct inode *inode) +void ext4_set_inode_flags(struct inode *inode, bool init) { unsigned int flags = EXT4_I(inode)->i_flags; unsigned int new_fl = 0; + WARN_ON_ONCE(IS_DAX(inode) && init); + if (flags & EXT4_SYNC_FL) new_fl |= S_SYNC; if (flags & EXT4_APPEND_FL) @@ -4438,8 +4447,13 @@ void ext4_set_inode_flags(struct inode *inode) new_fl |= S_NOATIME; if (flags & EXT4_DIRSYNC_FL) new_fl |= S_DIRSYNC; - if (ext4_should_use_dax(inode)) + + /* Because of the way inode_set_flags() works we must preserve S_DAX + * here if already set. */ + new_fl |= (inode->i_flags & S_DAX); + if (init && ext4_should_enable_dax(inode)) new_fl |= S_DAX; + if (flags & EXT4_ENCRYPT_FL) new_fl |= S_ENCRYPTED; if (flags & EXT4_CASEFOLD_FL) @@ -4653,7 +4667,7 @@ struct inode *__ext4_iget(struct super_block *sb, unsigned long ino, * not initialized on a new filesystem. */ } ei->i_flags = le32_to_cpu(raw_inode->i_flags); - ext4_set_inode_flags(inode); + ext4_set_inode_flags(inode, true); inode->i_blocks = ext4_inode_blocks(raw_inode, ei); ei->i_file_acl = le32_to_cpu(raw_inode->i_file_acl_lo); if (ext4_has_feature_64bit(sb)) |