diff options
| author | Joseph Qi <joseph.qi@huawei.com> | 2015-02-16 16:00:15 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2015-02-16 17:56:05 -0800 |
| commit | 160cc266639d4213c15c103074561c1b44ffe691 (patch) | |
| tree | 5994c8a38cb2f52b7cad048a3827aac9015fe28f /fs | |
| parent | 4813962beef7586f890a645a1bda77691da4b74a (diff) | |
| download | linux-160cc266639d4213c15c103074561c1b44ffe691.tar.bz2 | |
ocfs2: set append dio as a ro compat feature
Intruduce a bit OCFS2_FEATURE_RO_COMPAT_APPEND_DIO and check it in
write flow. If the bit is not set, fall back to the old way.
Signed-off-by: Joseph Qi <joseph.qi@huawei.com>
Cc: Weiwei Wang <wangww631@huawei.com>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Junxiao Bi <junxiao.bi@oracle.com>
Cc: Mark Fasheh <mfasheh@suse.com>
Cc: Xuejiufei <xuejiufei@huawei.com>
Cc: alex chen <alex.chen@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/ocfs2/file.c | 17 | ||||
| -rw-r--r-- | fs/ocfs2/ocfs2.h | 8 | ||||
| -rw-r--r-- | fs/ocfs2/ocfs2_fs.h | 8 |
3 files changed, 31 insertions, 2 deletions
diff --git a/fs/ocfs2/file.c b/fs/ocfs2/file.c index 784f2c72c992..46e0d4e857c7 100644 --- a/fs/ocfs2/file.c +++ b/fs/ocfs2/file.c @@ -2213,6 +2213,15 @@ static int ocfs2_prepare_inode_for_write(struct file *file, } /* + * Fallback to old way if the feature bit is not set. + */ + if (end > i_size_read(inode) && + !ocfs2_supports_append_dio(osb)) { + *direct_io = 0; + break; + } + + /* * We don't fill holes during direct io, so * check for them here. If any are found, the * caller will have to retake some cluster @@ -2220,7 +2229,13 @@ static int ocfs2_prepare_inode_for_write(struct file *file, */ ret = ocfs2_check_range_for_holes(inode, saved_pos, count); if (ret == 1) { - *direct_io = 0; + /* + * Fallback to old way if the feature bit is not set. + * Otherwise try dio first and then complete the rest + * request through buffer io. + */ + if (!ocfs2_supports_append_dio(osb)) + *direct_io = 0; ret = 0; } else if (ret < 0) mlog_errno(ret); diff --git a/fs/ocfs2/ocfs2.h b/fs/ocfs2/ocfs2.h index 7e39cd654834..8490c64d34fe 100644 --- a/fs/ocfs2/ocfs2.h +++ b/fs/ocfs2/ocfs2.h @@ -500,6 +500,14 @@ static inline int ocfs2_writes_unwritten_extents(struct ocfs2_super *osb) return 0; } +static inline int ocfs2_supports_append_dio(struct ocfs2_super *osb) +{ + if (osb->s_feature_ro_compat & OCFS2_FEATURE_RO_COMPAT_APPEND_DIO) + return 1; + return 0; +} + + static inline int ocfs2_supports_inline_data(struct ocfs2_super *osb) { if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_INLINE_DATA) diff --git a/fs/ocfs2/ocfs2_fs.h b/fs/ocfs2/ocfs2_fs.h index cf4fa43af78e..20e37a3ed26f 100644 --- a/fs/ocfs2/ocfs2_fs.h +++ b/fs/ocfs2/ocfs2_fs.h @@ -105,7 +105,8 @@ | OCFS2_FEATURE_INCOMPAT_CLUSTERINFO) #define OCFS2_FEATURE_RO_COMPAT_SUPP (OCFS2_FEATURE_RO_COMPAT_UNWRITTEN \ | OCFS2_FEATURE_RO_COMPAT_USRQUOTA \ - | OCFS2_FEATURE_RO_COMPAT_GRPQUOTA) + | OCFS2_FEATURE_RO_COMPAT_GRPQUOTA \ + | OCFS2_FEATURE_RO_COMPAT_APPEND_DIO) /* * Heartbeat-only devices are missing journals and other files. The @@ -199,6 +200,11 @@ #define OCFS2_FEATURE_RO_COMPAT_USRQUOTA 0x0002 #define OCFS2_FEATURE_RO_COMPAT_GRPQUOTA 0x0004 +/* + * Append Direct IO support + */ +#define OCFS2_FEATURE_RO_COMPAT_APPEND_DIO 0x0008 + /* The byte offset of the first backup block will be 1G. * The following will be 4G, 16G, 64G, 256G and 1T. */ |