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ocfs2: Integrate CoW in file write.

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When we use mmap, we CoW the refcountd clusters in
ocfs2_write_begin_nolock. While for normal file
io(including directio), we do CoW in
ocfs2_prepare_inode_for_write.

Signed-off-by: Tao Ma <tao.ma@oracle.com>
This commit is contained in:
Tao Ma
2009-08-25 08:02:48 +08:00
committed by Joel Becker
parent 6ae23c5555
commit 293b2f70b4
3 changed files with 104 additions and 1 deletions
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19
fs/ocfs2/aops.c
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@@ -44,6 +44,7 @@
#include "suballoc.h"
#include "super.h"
#include "symlink.h"
#include "refcounttree.h"
#include "buffer_head_io.h"
@@ -590,6 +591,8 @@ static int ocfs2_direct_IO_get_blocks(struct inode *inode, sector_t iblock,
goto bail;
}
/* We should already CoW the refcounted extent. */
BUG_ON(ext_flags & OCFS2_EXT_REFCOUNTED);
/*
* get_more_blocks() expects us to describe a hole by clearing
* the mapped bit on bh_result().
@@ -1449,6 +1452,9 @@ static int ocfs2_populate_write_desc(struct inode *inode,
goto out;
}
/* We should already CoW the refcountd extent. */
BUG_ON(ext_flags & OCFS2_EXT_REFCOUNTED);
/*
* Assume worst case - that we're writing in
* the middle of the extent.
@@ -1700,6 +1706,19 @@ int ocfs2_write_begin_nolock(struct address_space *mapping,
goto out;
}
ret = ocfs2_check_range_for_refcount(inode, pos, len);
if (ret < 0) {
mlog_errno(ret);
goto out;
} else if (ret == 1) {
ret = ocfs2_refcount_cow(inode, di_bh,
wc->w_cpos, wc->w_clen);
if (ret) {
mlog_errno(ret);
goto out;
}
}
ret = ocfs2_populate_write_desc(inode, wc, &clusters_to_alloc,
&extents_to_split);
if (ret) {