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xfs: remove xfs_probe_cluster

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xfs_map_blocks always calls xfs_bmapi with the XFS_BMAPI_ENTIRE
entire flag, which tells it to not cap the extent at the passed in
size, but just treat the size as an minimum to map.  This means
xfs_probe_cluster is entirely useless as we'll always get the whole
extent back anyway.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Alex Elder <aelder@sgi.com>
This commit is contained in:
Christoph Hellwig 2010-12-10 08:42:22 +00:00 committed by Alex Elder
parent 8ff2957d58
commit ed1e7b7e48
1 changed files with 4 additions and 107 deletions
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111
fs/xfs/linux-2.6/xfs_aops.c
View file

@ -304,13 +304,13 @@ STATIC int
xfs_map_blocks(
struct inode *inode,
loff_t offset,
ssize_t count,
struct xfs_bmbt_irec *imap,
int type,
int nonblocking)
{
struct xfs_inode *ip = XFS_I(inode);
struct xfs_mount *mp = ip->i_mount;
ssize_t count = 1 << inode->i_blkbits;
xfs_fileoff_t offset_fsb, end_fsb;
int error = 0;
int bmapi_flags = XFS_BMAPI_ENTIRE;
@ -634,108 +634,6 @@ xfs_map_at_offset(
clear_buffer_unwritten(bh);
}
/*
* Look for a page at index that is suitable for clustering.
*/
STATIC unsigned int
xfs_probe_page(
struct page *page,
unsigned int pg_offset)
{
struct buffer_head *bh, *head;
int ret = 0;
if (PageWriteback(page))
return 0;
if (!PageDirty(page))
return 0;
if (!page->mapping)
return 0;
if (!page_has_buffers(page))
return 0;
bh = head = page_buffers(page);
do {
if (!buffer_uptodate(bh))
break;
if (!buffer_mapped(bh))
break;
ret += bh->b_size;
if (ret >= pg_offset)
break;
} while ((bh = bh->b_this_page) != head);
return ret;
}
STATIC size_t
xfs_probe_cluster(
struct inode *inode,
struct page *startpage,
struct buffer_head *bh,
struct buffer_head *head)
{
struct pagevec pvec;
pgoff_t tindex, tlast, tloff;
size_t total = 0;
int done = 0, i;
/* First sum forwards in this page */
do {
if (!buffer_uptodate(bh) || !buffer_mapped(bh))
return total;
total += bh->b_size;
} while ((bh = bh->b_this_page) != head);
/* if we reached the end of the page, sum forwards in following pages */
tlast = i_size_read(inode) >> PAGE_CACHE_SHIFT;
tindex = startpage->index + 1;
/* Prune this back to avoid pathological behavior */
tloff = min(tlast, startpage->index + 64);
pagevec_init(&pvec, 0);
while (!done && tindex <= tloff) {
unsigned len = min_t(pgoff_t, PAGEVEC_SIZE, tlast - tindex + 1);
if (!pagevec_lookup(&pvec, inode->i_mapping, tindex, len))
break;
for (i = 0; i < pagevec_count(&pvec); i++) {
struct page *page = pvec.pages[i];
size_t pg_offset, pg_len = 0;
if (tindex == tlast) {
pg_offset =
i_size_read(inode) & (PAGE_CACHE_SIZE - 1);
if (!pg_offset) {
done = 1;
break;
}
} else
pg_offset = PAGE_CACHE_SIZE;
if (page->index == tindex && trylock_page(page)) {
pg_len = xfs_probe_page(page, pg_offset);
unlock_page(page);
}
if (!pg_len) {
done = 1;
break;
}
total += pg_len;
tindex++;
}
pagevec_release(&pvec);
cond_resched();
}
return total;
}
/*
* Test if a given page is suitable for writing as part of an unwritten
* or delayed allocate extent.
@ -1028,7 +926,7 @@ xfs_vm_writepage(
unsigned int type;
__uint64_t end_offset;
pgoff_t end_index, last_index;
ssize_t size, len;
ssize_t len;
int err, imap_valid = 0, uptodate = 1;
int count = 0;
int all_bh = 0;
@ -1133,7 +1031,7 @@ xfs_vm_writepage(
* for unwritten extent conversion.
*/
new_ioend = 1;
err = xfs_map_blocks(inode, offset, len, &imap,
err = xfs_map_blocks(inode, offset, &imap,
type, nonblocking);
if (err)
goto error;
@ -1158,8 +1056,7 @@ xfs_vm_writepage(
}
if (!imap_valid) {
new_ioend = 1;
size = xfs_probe_cluster(inode, page, bh, head);
err = xfs_map_blocks(inode, offset, size,
err = xfs_map_blocks(inode, offset,
&imap, type, nonblocking);
if (err)
goto error;