From: Gang He <g...@suse.com> 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. [g...@suse.com: v2] Link: https://urldefense.proofpoint.com/v2/url?u=http-3A__lkml.kernel.org_r_1511944612-2D9629-2D3-2Dgit-2Dsend-2Demail-2Dghe-40suse.com&d=DwICAg&c=RoP1YumCXCgaWHvlZYR8PZh8Bv7qIrMUB65eapI_JnE&r=C7gAd4uDxlAvTdc0vmU6X8CMk6L2iDY8-HD0qT6Fo7Y&m=C4AZ7lGI2-gfFtbla8puNvYIA3a9Cr_XOH6oyx94oGo&s=QhxdPyP9gdEJZTa2UhuSk0x7ENXyGXUOIBV_LyP8oZw&e= Link: https://urldefense.proofpoint.com/v2/url?u=http-3A__lkml.kernel.org_r_1511775987-2D841-2D3-2Dgit-2Dsend-2Demail-2Dghe-40suse.com&d=DwICAg&c=RoP1YumCXCgaWHvlZYR8PZh8Bv7qIrMUB65eapI_JnE&r=C7gAd4uDxlAvTdc0vmU6X8CMk6L2iDY8-HD0qT6Fo7Y&m=C4AZ7lGI2-gfFtbla8puNvYIA3a9Cr_XOH6oyx94oGo&s=T9Ljku-nipBqCaeXWukY2hAwcHQL95gtlU7pS3l1fgs&e= Signed-off-by: Gang He <g...@suse.com> Cc: Mark Fasheh <mfas...@versity.com> Cc: Joel Becker <jl...@evilplan.org> Cc: Junxiao Bi <junxiao...@oracle.com> Cc: Joseph Qi <jiangqi...@gmail.com> Cc: Changwei Ge <ge.chang...@h3c.com> Signed-off-by: Andrew Morton <a...@linux-foundation.org> --- fs/ocfs2/extent_map.c | 41 ++++++++++++++++++++++++++++++++++++++++ fs/ocfs2/extent_map.h | 3 ++ 2 files changed, 44 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 +832,47 @@ out: return ret; } +/* Is IO overwriting allocated blocks? */ +int ocfs2_overwrite_io(struct inode *inode, struct buffer_head *di_bh, + u64 map_start, u64 map_len) +{ + int ret = 0, is_last; + u32 mapping_end, cpos; + struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); + struct ocfs2_extent_rec rec; + + if ((OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) && + ((map_start + map_len) <= i_size_read(inode))) + goto out; + + 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; + } + + 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 = -EAGAIN; +out: + return ret; +} + 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, struct buffer_head *di_bh, + u64 map_start, u64 map_len); + 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, _ _______________________________________________ Ocfs2-devel mailing list Ocfs2-devel@oss.oracle.com https://oss.oracle.com/mailman/listinfo/ocfs2-devel
