[XFS] Move some code around to avoid prototypes and prep for future
writepages code. SGI-PV: 950211 SGI-Modid: xfs-linux-melb:xfs-kern:25311a Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Nathan Scott <nathans@sgi.com>
This commit is contained in:
Nathan Scott
parent
02d7c92334
commit
f51623b21f
@ -43,7 +43,32 @@
|
||||
#include <linux/pagevec.h>
|
||||
#include <linux/writeback.h>
|
||||
|
||||
STATIC void xfs_count_page_state(struct page *, int *, int *, int *);
|
||||
|
||||
STATIC void
|
||||
xfs_count_page_state(
|
||||
struct page *page,
|
||||
int *delalloc,
|
||||
int *unmapped,
|
||||
int *unwritten)
|
||||
{
|
||||
struct buffer_head *bh, *head;
|
||||
|
||||
*delalloc = *unmapped = *unwritten = 0;
|
||||
|
||||
bh = head = page_buffers(page);
|
||||
do {
|
||||
if (buffer_uptodate(bh) && !buffer_mapped(bh))
|
||||
(*unmapped) = 1;
|
||||
else if (buffer_unwritten(bh) && !buffer_delay(bh))
|
||||
clear_buffer_unwritten(bh);
|
||||
else if (buffer_unwritten(bh))
|
||||
(*unwritten) = 1;
|
||||
else if (buffer_delay(bh))
|
||||
(*delalloc) = 1;
|
||||
} while ((bh = bh->b_this_page) != head);
|
||||
}
|
||||
|
||||
|
||||
|
||||
#if defined(XFS_RW_TRACE)
|
||||
void
|
||||
@ -1040,6 +1065,154 @@ error:
|
||||
return err;
|
||||
}
|
||||
|
||||
/*
|
||||
* writepage: Called from one of two places:
|
||||
*
|
||||
* 1. we are flushing a delalloc buffer head.
|
||||
*
|
||||
* 2. we are writing out a dirty page. Typically the page dirty
|
||||
* state is cleared before we get here. In this case is it
|
||||
* conceivable we have no buffer heads.
|
||||
*
|
||||
* For delalloc space on the page we need to allocate space and
|
||||
* flush it. For unmapped buffer heads on the page we should
|
||||
* allocate space if the page is uptodate. For any other dirty
|
||||
* buffer heads on the page we should flush them.
|
||||
*
|
||||
* If we detect that a transaction would be required to flush
|
||||
* the page, we have to check the process flags first, if we
|
||||
* are already in a transaction or disk I/O during allocations
|
||||
* is off, we need to fail the writepage and redirty the page.
|
||||
*/
|
||||
|
||||
STATIC int
|
||||
linvfs_writepage(
|
||||
struct page *page,
|
||||
struct writeback_control *wbc)
|
||||
{
|
||||
int error;
|
||||
int need_trans;
|
||||
int delalloc, unmapped, unwritten;
|
||||
struct inode *inode = page->mapping->host;
|
||||
|
||||
xfs_page_trace(XFS_WRITEPAGE_ENTER, inode, page, 0);
|
||||
|
||||
/*
|
||||
* We need a transaction if:
|
||||
* 1. There are delalloc buffers on the page
|
||||
* 2. The page is uptodate and we have unmapped buffers
|
||||
* 3. The page is uptodate and we have no buffers
|
||||
* 4. There are unwritten buffers on the page
|
||||
*/
|
||||
|
||||
if (!page_has_buffers(page)) {
|
||||
unmapped = 1;
|
||||
need_trans = 1;
|
||||
} else {
|
||||
xfs_count_page_state(page, &delalloc, &unmapped, &unwritten);
|
||||
if (!PageUptodate(page))
|
||||
unmapped = 0;
|
||||
need_trans = delalloc + unmapped + unwritten;
|
||||
}
|
||||
|
||||
/*
|
||||
* If we need a transaction and the process flags say
|
||||
* we are already in a transaction, or no IO is allowed
|
||||
* then mark the page dirty again and leave the page
|
||||
* as is.
|
||||
*/
|
||||
if (PFLAGS_TEST_FSTRANS() && need_trans)
|
||||
goto out_fail;
|
||||
|
||||
/*
|
||||
* Delay hooking up buffer heads until we have
|
||||
* made our go/no-go decision.
|
||||
*/
|
||||
if (!page_has_buffers(page))
|
||||
create_empty_buffers(page, 1 << inode->i_blkbits, 0);
|
||||
|
||||
/*
|
||||
* Convert delayed allocate, unwritten or unmapped space
|
||||
* to real space and flush out to disk.
|
||||
*/
|
||||
error = xfs_page_state_convert(inode, page, wbc, 1, unmapped);
|
||||
if (error == -EAGAIN)
|
||||
goto out_fail;
|
||||
if (unlikely(error < 0))
|
||||
goto out_unlock;
|
||||
|
||||
return 0;
|
||||
|
||||
out_fail:
|
||||
redirty_page_for_writepage(wbc, page);
|
||||
unlock_page(page);
|
||||
return 0;
|
||||
out_unlock:
|
||||
unlock_page(page);
|
||||
return error;
|
||||
}
|
||||
|
||||
/*
|
||||
* Called to move a page into cleanable state - and from there
|
||||
* to be released. Possibly the page is already clean. We always
|
||||
* have buffer heads in this call.
|
||||
*
|
||||
* Returns 0 if the page is ok to release, 1 otherwise.
|
||||
*
|
||||
* Possible scenarios are:
|
||||
*
|
||||
* 1. We are being called to release a page which has been written
|
||||
* to via regular I/O. buffer heads will be dirty and possibly
|
||||
* delalloc. If no delalloc buffer heads in this case then we
|
||||
* can just return zero.
|
||||
*
|
||||
* 2. We are called to release a page which has been written via
|
||||
* mmap, all we need to do is ensure there is no delalloc
|
||||
* state in the buffer heads, if not we can let the caller
|
||||
* free them and we should come back later via writepage.
|
||||
*/
|
||||
STATIC int
|
||||
linvfs_release_page(
|
||||
struct page *page,
|
||||
gfp_t gfp_mask)
|
||||
{
|
||||
struct inode *inode = page->mapping->host;
|
||||
int dirty, delalloc, unmapped, unwritten;
|
||||
struct writeback_control wbc = {
|
||||
.sync_mode = WB_SYNC_ALL,
|
||||
.nr_to_write = 1,
|
||||
};
|
||||
|
||||
xfs_page_trace(XFS_RELEASEPAGE_ENTER, inode, page, gfp_mask);
|
||||
|
||||
xfs_count_page_state(page, &delalloc, &unmapped, &unwritten);
|
||||
if (!delalloc && !unwritten)
|
||||
goto free_buffers;
|
||||
|
||||
if (!(gfp_mask & __GFP_FS))
|
||||
return 0;
|
||||
|
||||
/* If we are already inside a transaction or the thread cannot
|
||||
* do I/O, we cannot release this page.
|
||||
*/
|
||||
if (PFLAGS_TEST_FSTRANS())
|
||||
return 0;
|
||||
|
||||
/*
|
||||
* Convert delalloc space to real space, do not flush the
|
||||
* data out to disk, that will be done by the caller.
|
||||
* Never need to allocate space here - we will always
|
||||
* come back to writepage in that case.
|
||||
*/
|
||||
dirty = xfs_page_state_convert(inode, page, &wbc, 0, 0);
|
||||
if (dirty == 0 && !unwritten)
|
||||
goto free_buffers;
|
||||
return 0;
|
||||
|
||||
free_buffers:
|
||||
return try_to_free_buffers(page);
|
||||
}
|
||||
|
||||
STATIC int
|
||||
__linvfs_get_block(
|
||||
struct inode *inode,
|
||||
@ -1223,6 +1396,15 @@ linvfs_direct_IO(
|
||||
return ret;
|
||||
}
|
||||
|
||||
STATIC int
|
||||
linvfs_prepare_write(
|
||||
struct file *file,
|
||||
struct page *page,
|
||||
unsigned int from,
|
||||
unsigned int to)
|
||||
{
|
||||
return block_prepare_write(page, from, to, linvfs_get_block);
|
||||
}
|
||||
|
||||
STATIC sector_t
|
||||
linvfs_bmap(
|
||||
@ -1259,118 +1441,6 @@ linvfs_readpages(
|
||||
return mpage_readpages(mapping, pages, nr_pages, linvfs_get_block);
|
||||
}
|
||||
|
||||
STATIC void
|
||||
xfs_count_page_state(
|
||||
struct page *page,
|
||||
int *delalloc,
|
||||
int *unmapped,
|
||||
int *unwritten)
|
||||
{
|
||||
struct buffer_head *bh, *head;
|
||||
|
||||
*delalloc = *unmapped = *unwritten = 0;
|
||||
|
||||
bh = head = page_buffers(page);
|
||||
do {
|
||||
if (buffer_uptodate(bh) && !buffer_mapped(bh))
|
||||
(*unmapped) = 1;
|
||||
else if (buffer_unwritten(bh) && !buffer_delay(bh))
|
||||
clear_buffer_unwritten(bh);
|
||||
else if (buffer_unwritten(bh))
|
||||
(*unwritten) = 1;
|
||||
else if (buffer_delay(bh))
|
||||
(*delalloc) = 1;
|
||||
} while ((bh = bh->b_this_page) != head);
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
* writepage: Called from one of two places:
|
||||
*
|
||||
* 1. we are flushing a delalloc buffer head.
|
||||
*
|
||||
* 2. we are writing out a dirty page. Typically the page dirty
|
||||
* state is cleared before we get here. In this case is it
|
||||
* conceivable we have no buffer heads.
|
||||
*
|
||||
* For delalloc space on the page we need to allocate space and
|
||||
* flush it. For unmapped buffer heads on the page we should
|
||||
* allocate space if the page is uptodate. For any other dirty
|
||||
* buffer heads on the page we should flush them.
|
||||
*
|
||||
* If we detect that a transaction would be required to flush
|
||||
* the page, we have to check the process flags first, if we
|
||||
* are already in a transaction or disk I/O during allocations
|
||||
* is off, we need to fail the writepage and redirty the page.
|
||||
*/
|
||||
|
||||
STATIC int
|
||||
linvfs_writepage(
|
||||
struct page *page,
|
||||
struct writeback_control *wbc)
|
||||
{
|
||||
int error;
|
||||
int need_trans;
|
||||
int delalloc, unmapped, unwritten;
|
||||
struct inode *inode = page->mapping->host;
|
||||
|
||||
xfs_page_trace(XFS_WRITEPAGE_ENTER, inode, page, 0);
|
||||
|
||||
/*
|
||||
* We need a transaction if:
|
||||
* 1. There are delalloc buffers on the page
|
||||
* 2. The page is uptodate and we have unmapped buffers
|
||||
* 3. The page is uptodate and we have no buffers
|
||||
* 4. There are unwritten buffers on the page
|
||||
*/
|
||||
|
||||
if (!page_has_buffers(page)) {
|
||||
unmapped = 1;
|
||||
need_trans = 1;
|
||||
} else {
|
||||
xfs_count_page_state(page, &delalloc, &unmapped, &unwritten);
|
||||
if (!PageUptodate(page))
|
||||
unmapped = 0;
|
||||
need_trans = delalloc + unmapped + unwritten;
|
||||
}
|
||||
|
||||
/*
|
||||
* If we need a transaction and the process flags say
|
||||
* we are already in a transaction, or no IO is allowed
|
||||
* then mark the page dirty again and leave the page
|
||||
* as is.
|
||||
*/
|
||||
if (PFLAGS_TEST_FSTRANS() && need_trans)
|
||||
goto out_fail;
|
||||
|
||||
/*
|
||||
* Delay hooking up buffer heads until we have
|
||||
* made our go/no-go decision.
|
||||
*/
|
||||
if (!page_has_buffers(page))
|
||||
create_empty_buffers(page, 1 << inode->i_blkbits, 0);
|
||||
|
||||
/*
|
||||
* Convert delayed allocate, unwritten or unmapped space
|
||||
* to real space and flush out to disk.
|
||||
*/
|
||||
error = xfs_page_state_convert(inode, page, wbc, 1, unmapped);
|
||||
if (error == -EAGAIN)
|
||||
goto out_fail;
|
||||
if (unlikely(error < 0))
|
||||
goto out_unlock;
|
||||
|
||||
return 0;
|
||||
|
||||
out_fail:
|
||||
redirty_page_for_writepage(wbc, page);
|
||||
unlock_page(page);
|
||||
return 0;
|
||||
out_unlock:
|
||||
unlock_page(page);
|
||||
return error;
|
||||
}
|
||||
|
||||
STATIC int
|
||||
linvfs_invalidate_page(
|
||||
struct page *page,
|
||||
@ -1381,77 +1451,6 @@ linvfs_invalidate_page(
|
||||
return block_invalidatepage(page, offset);
|
||||
}
|
||||
|
||||
/*
|
||||
* Called to move a page into cleanable state - and from there
|
||||
* to be released. Possibly the page is already clean. We always
|
||||
* have buffer heads in this call.
|
||||
*
|
||||
* Returns 0 if the page is ok to release, 1 otherwise.
|
||||
*
|
||||
* Possible scenarios are:
|
||||
*
|
||||
* 1. We are being called to release a page which has been written
|
||||
* to via regular I/O. buffer heads will be dirty and possibly
|
||||
* delalloc. If no delalloc buffer heads in this case then we
|
||||
* can just return zero.
|
||||
*
|
||||
* 2. We are called to release a page which has been written via
|
||||
* mmap, all we need to do is ensure there is no delalloc
|
||||
* state in the buffer heads, if not we can let the caller
|
||||
* free them and we should come back later via writepage.
|
||||
*/
|
||||
STATIC int
|
||||
linvfs_release_page(
|
||||
struct page *page,
|
||||
gfp_t gfp_mask)
|
||||
{
|
||||
struct inode *inode = page->mapping->host;
|
||||
int dirty, delalloc, unmapped, unwritten;
|
||||
struct writeback_control wbc = {
|
||||
.sync_mode = WB_SYNC_ALL,
|
||||
.nr_to_write = 1,
|
||||
};
|
||||
|
||||
xfs_page_trace(XFS_RELEASEPAGE_ENTER, inode, page, gfp_mask);
|
||||
|
||||
xfs_count_page_state(page, &delalloc, &unmapped, &unwritten);
|
||||
if (!delalloc && !unwritten)
|
||||
goto free_buffers;
|
||||
|
||||
if (!(gfp_mask & __GFP_FS))
|
||||
return 0;
|
||||
|
||||
/* If we are already inside a transaction or the thread cannot
|
||||
* do I/O, we cannot release this page.
|
||||
*/
|
||||
if (PFLAGS_TEST_FSTRANS())
|
||||
return 0;
|
||||
|
||||
/*
|
||||
* Convert delalloc space to real space, do not flush the
|
||||
* data out to disk, that will be done by the caller.
|
||||
* Never need to allocate space here - we will always
|
||||
* come back to writepage in that case.
|
||||
*/
|
||||
dirty = xfs_page_state_convert(inode, page, &wbc, 0, 0);
|
||||
if (dirty == 0 && !unwritten)
|
||||
goto free_buffers;
|
||||
return 0;
|
||||
|
||||
free_buffers:
|
||||
return try_to_free_buffers(page);
|
||||
}
|
||||
|
||||
STATIC int
|
||||
linvfs_prepare_write(
|
||||
struct file *file,
|
||||
struct page *page,
|
||||
unsigned int from,
|
||||
unsigned int to)
|
||||
{
|
||||
return block_prepare_write(page, from, to, linvfs_get_block);
|
||||
}
|
||||
|
||||
struct address_space_operations linvfs_aops = {
|
||||
.readpage = linvfs_readpage,
|
||||
.readpages = linvfs_readpages,
|
||||
|
||||
Loading…
Reference in New Issue
Block a user