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Merge branch 'xfs-bug-fixes-for-3.15-2' into for-next

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This commit is contained in:
Dave Chinner
2014-03-13 19:13:05 +11:00
parent 49ae4b97d7 fe4c224aa1
commit 5f44e4c185
8 changed files with 126 additions and 39 deletions
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81
fs/xfs/xfs_aops.c
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@@ -632,38 +632,46 @@ xfs_map_at_offset(
}
/*
* Test if a given page is suitable for writing as part of an unwritten
* or delayed allocate extent.
* Test if a given page contains at least one buffer of a given @type.
* If @check_all_buffers is true, then we walk all the buffers in the page to
* try to find one of the type passed in. If it is not set, then the caller only
* needs to check the first buffer on the page for a match.
*/
STATIC int
STATIC bool
xfs_check_page_type(
struct page *page,
unsigned int type)
unsigned int type,
bool check_all_buffers)
{
struct buffer_head *bh;
struct buffer_head *head;
if (PageWriteback(page))
return 0;
return false;
if (!page->mapping)
return false;
if (!page_has_buffers(page))
return false;
if (page->mapping && page_has_buffers(page)) {
struct buffer_head *bh, *head;
int acceptable = 0;
bh = head = page_buffers(page);
do {
if (buffer_unwritten(bh)) {
if (type == XFS_IO_UNWRITTEN)
return true;
} else if (buffer_delay(bh)) {
if (type == XFS_IO_DELALLOC);
return true;
} else if (buffer_dirty(bh) && buffer_mapped(bh)) {
if (type == XFS_IO_OVERWRITE);
return true;
}
bh = head = page_buffers(page);
do {
if (buffer_unwritten(bh))
acceptable += (type == XFS_IO_UNWRITTEN);
else if (buffer_delay(bh))
acceptable += (type == XFS_IO_DELALLOC);
else if (buffer_dirty(bh) && buffer_mapped(bh))
acceptable += (type == XFS_IO_OVERWRITE);
else
break;
} while ((bh = bh->b_this_page) != head);
/* If we are only checking the first buffer, we are done now. */
if (!check_all_buffers)
break;
} while ((bh = bh->b_this_page) != head);
if (acceptable)
return 1;
}
return 0;
return false;
}
/*
@@ -697,7 +705,7 @@ xfs_convert_page(
goto fail_unlock_page;
if (page->mapping != inode->i_mapping)
goto fail_unlock_page;
if (!xfs_check_page_type(page, (*ioendp)->io_type))
if (!xfs_check_page_type(page, (*ioendp)->io_type, false))
goto fail_unlock_page;
/*
@@ -742,6 +750,15 @@ xfs_convert_page(
p_offset = p_offset ? roundup(p_offset, len) : PAGE_CACHE_SIZE;
page_dirty = p_offset / len;
/*
* The moment we find a buffer that doesn't match our current type
* specification or can't be written, abort the loop and start
* writeback. As per the above xfs_imap_valid() check, only
* xfs_vm_writepage() can handle partial page writeback fully - we are
* limited here to the buffers that are contiguous with the current
* ioend, and hence a buffer we can't write breaks that contiguity and
* we have to defer the rest of the IO to xfs_vm_writepage().
*/
bh = head = page_buffers(page);
do {
if (offset >= end_offset)
@@ -750,7 +767,7 @@ xfs_convert_page(
uptodate = 0;
if (!(PageUptodate(page) || buffer_uptodate(bh))) {
done = 1;
continue;
break;
}
if (buffer_unwritten(bh) || buffer_delay(bh) ||
@@ -762,10 +779,11 @@ xfs_convert_page(
else
type = XFS_IO_OVERWRITE;
if (!xfs_imap_valid(inode, imap, offset)) {
done = 1;
continue;
}
/*
* imap should always be valid because of the above
* partial page end_offset check on the imap.
*/
ASSERT(xfs_imap_valid(inode, imap, offset));
lock_buffer(bh);
if (type != XFS_IO_OVERWRITE)
@@ -777,6 +795,7 @@ xfs_convert_page(
count++;
} else {
done = 1;
break;
}
} while (offset += len, (bh = bh->b_this_page) != head);
@@ -868,7 +887,7 @@ xfs_aops_discard_page(
struct buffer_head *bh, *head;
loff_t offset = page_offset(page);
if (!xfs_check_page_type(page, XFS_IO_DELALLOC))
if (!xfs_check_page_type(page, XFS_IO_DELALLOC, true))
goto out_invalidate;
if (XFS_FORCED_SHUTDOWN(ip->i_mount))