From: Gang He <ghe@xxxxxxxx> Subject: ocfs2: add ocfs2_overwrite_io() Add ocfs2_overwrite_io function, which is used to judge if overwrite allocated blocks, otherwise, the write will bring extra block allocation overhead. [ghe@xxxxxxxx: v3] Link: http://lkml.kernel.org/r/1514455665-16325-3-git-send-email-ghe@xxxxxxxx [ghe@xxxxxxxx: v2] Link: http://lkml.kernel.org/r/1511944612-9629-3-git-send-email-ghe@xxxxxxxx Link: http://lkml.kernel.org/r/1511775987-841-3-git-send-email-ghe@xxxxxxxx Signed-off-by: Gang He <ghe@xxxxxxxx> Reviewed-by: Changwei Ge <ge.changwei@xxxxxxx> Cc: Mark Fasheh <mfasheh@xxxxxxxxxxx> Cc: Joel Becker <jlbec@xxxxxxxxxxxx> Cc: Junxiao Bi <junxiao.bi@xxxxxxxxxx> Cc: Joseph Qi <jiangqi903@xxxxxxxxx> Cc: Jun Piao <piaojun@xxxxxxxxxx> Cc: alex chen <alex.chen@xxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- fs/ocfs2/extent_map.c | 45 ++++++++++++++++++++++++++++++++++++++++ fs/ocfs2/extent_map.h | 3 ++ 2 files changed, 48 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 @@ -38,6 +38,7 @@ #include "inode.h" #include "super.h" #include "symlink.h" +#include "aops.h" #include "ocfs2_trace.h" #include "buffer_head_io.h" @@ -832,6 +833,50 @@ 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) { + if (ocfs2_size_fits_inline_data(di_bh, map_start + map_len)) + return ret; + else + return -EAGAIN; + } + + 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, _ -- To unsubscribe from this list: send the line "unsubscribe mm-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
