The patch titled
Subject: ocfs2: add ocfs2_overwrite_io()
has been added to the -mm tree. Its filename is
ocfs2-add-ocfs2_overwrite_io-function.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/ocfs2-add-ocfs2_overwrite_io-function.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/ocfs2-add-ocfs2_overwrite_io-function.patch
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*** Remember to use Documentation/SubmitChecklist when testing your code ***
The -mm tree is included into linux-next and is updated
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------------------------------------------------------
From: Gang He <ghe@xxxxxxxx>
Subject: ocfs2: add ocfs2_overwrite_io()
Add ocfs2_overwrite_io(), which is used to judge if overwrite allocated
blocks, otherwise, the write will bring extra block allocation overhead.
Link: http://lkml.kernel.org/r/1511775987-841-3-git-send-email-ghe@xxxxxxxx
Signed-off-by: Gang He <ghe@xxxxxxxx>
Cc: Mark Fasheh <mfasheh@xxxxxxxxxxx>
Cc: Joel Becker <jlbec@xxxxxxxxxxxx>
Cc: Junxiao Bi <junxiao.bi@xxxxxxxxxx>
Cc: Joseph Qi <jiangqi903@xxxxxxxxx>
Cc: Changwei Ge <ge.changwei@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/ocfs2/extent_map.c | 67 ++++++++++++++++++++++++++++++++++++++++
fs/ocfs2/extent_map.h | 3 +
2 files changed, 70 insertions(+)
diff -puN fs/ocfs2/extent_map.c~ocfs2-add-ocfs2_overwrite_io-function fs/ocfs2/extent_map.c
--- a/fs/ocfs2/extent_map.c~ocfs2-add-ocfs2_overwrite_io-function
+++ a/fs/ocfs2/extent_map.c
@@ -832,6 +832,73 @@ out:
return ret;
}
+/* Is IO overwriting allocated blocks? */
+int ocfs2_overwrite_io(struct inode *inode, u64 map_start, u64 map_len,
+ int wait)
+{
+ int ret = 0, is_last;
+ u32 mapping_end, cpos;
+ struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
+ struct buffer_head *di_bh = NULL;
+ struct ocfs2_extent_rec rec;
+
+ if (wait)
+ ret = ocfs2_inode_lock(inode, &di_bh, 0);
+ else
+ ret = ocfs2_try_inode_lock(inode, &di_bh, 0);
+ if (ret)
+ goto out;
+
+ if (wait)
+ down_read(&OCFS2_I(inode)->ip_alloc_sem);
+ else {
+ if (!down_read_trylock(&OCFS2_I(inode)->ip_alloc_sem)) {
+ ret = -EAGAIN;
+ goto out_unlock1;
+ }
+ }
+
+ if ((OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) &&
+ ((map_start + map_len) <= i_size_read(inode)))
+ goto out_unlock2;
+
+ cpos = map_start >> osb->s_clustersize_bits;
+ mapping_end = ocfs2_clusters_for_bytes(inode->i_sb,
+ map_start + map_len);
+ is_last = 0;
+ while (cpos < mapping_end && !is_last) {
+ ret = ocfs2_get_clusters_nocache(inode, di_bh, cpos,
+ NULL, &rec, &is_last);
+ if (ret) {
+ mlog_errno(ret);
+ goto out_unlock2;
+ }
+
+ if (rec.e_blkno == 0ULL)
+ break;
+
+ if (rec.e_flags & OCFS2_EXT_REFCOUNTED)
+ break;
+
+ cpos = le32_to_cpu(rec.e_cpos) +
+ le16_to_cpu(rec.e_leaf_clusters);
+ }
+
+ if (cpos < mapping_end)
+ ret = 1;
+
+out_unlock2:
+ brelse(di_bh);
+
+ up_read(&OCFS2_I(inode)->ip_alloc_sem);
+
+out_unlock1:
+ ocfs2_inode_unlock(inode, 0);
+
+out:
+ return (ret ? 0 : 1);
+}
+
int ocfs2_seek_data_hole_offset(struct file *file, loff_t *offset, int whence)
{
struct inode *inode = file->f_mapping->host;
diff -puN fs/ocfs2/extent_map.h~ocfs2-add-ocfs2_overwrite_io-function fs/ocfs2/extent_map.h
--- a/fs/ocfs2/extent_map.h~ocfs2-add-ocfs2_overwrite_io-function
+++ a/fs/ocfs2/extent_map.h
@@ -53,6 +53,9 @@ int ocfs2_extent_map_get_blocks(struct i
int ocfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
u64 map_start, u64 map_len);
+int ocfs2_overwrite_io(struct inode *inode, u64 map_start, u64 map_len,
+ int wait);
+
int ocfs2_seek_data_hole_offset(struct file *file, loff_t *offset, int origin);
int ocfs2_xattr_get_clusters(struct inode *inode, u32 v_cluster,
_
Patches currently in -mm which might be from ghe@xxxxxxxx are
ocfs2-get-rid-of-ocfs2_is_o2cb_active-function.patch
ocfs2-give-an-obvious-tip-for-dismatch-cluster-names.patch
ocfs2-give-an-obvious-tip-for-dismatch-cluster-names-v2.patch
ocfs2-move-some-definitions-to-header-file.patch
ocfs2-fix-some-small-problems.patch
ocfs2-add-kobject-for-online-file-check.patch
ocfs2-add-duplicative-ino-number-check.patch
ocfs2-add-ocfs2_try_rw_lock-and-ocfs2_try_inode_lock.patch
ocfs2-add-ocfs2_overwrite_io-function.patch
ocfs2-nowait-aio-support.patch
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