Commit ac604d3c authored by Gang He's avatar Gang He Committed by Linus Torvalds
Browse files

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@suse.com: v3]
  Link: http://lkml.kernel.org/r/1514455665-16325-3-git-send-email-ghe@suse.com
[ghe@suse.com: v2]
  Link: http://lkml.kernel.org/r/1511944612-9629-3-git-send-email-ghe@suse.com
Link: http://lkml.kernel.org/r/1511775987-841-3-git-send-email-ghe@suse.com


Signed-off-by: default avatarGang He <ghe@suse.com>
Reviewed-by: default avatarChangwei Ge <ge.changwei@h3c.com>
Cc: Mark Fasheh <mfasheh@versity.com>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Junxiao Bi <junxiao.bi@oracle.com>
Cc: Joseph Qi <jiangqi903@gmail.com>
Cc: Jun Piao <piaojun@huawei.com>
Cc: alex chen <alex.chen@huawei.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 06e7f13d

fs/ocfs2/extent_map.c

+45 −0
Original line number Diff line number Diff line
@@ -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;

fs/ocfs2/extent_map.h

+3 −0
Original line number Diff line number Diff line
@@ -53,6 +53,9 @@ int ocfs2_extent_map_get_blocks(struct inode *inode, u64 v_blkno, u64 *p_blkno, 
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,

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