#include <linux/delay.h>
#include <linux/bio.h>
#include <linux/gfs2_ondisk.h>
-#include <linux/lm_interface.h>
#include "gfs2.h"
#include "incore.h"
#include "rgrp.h"
#include "trans.h"
#include "util.h"
-#include "ops_address.h"
-static int aspace_get_block(struct inode *inode, sector_t lblock,
- struct buffer_head *bh_result, int create)
+static int gfs2_aspace_writepage(struct page *page, struct writeback_control *wbc)
{
- gfs2_assert_warn(inode->i_sb->s_fs_info, 0);
- return -EOPNOTSUPP;
-}
+ int err;
+ struct buffer_head *bh, *head;
+ int nr_underway = 0;
+ int write_op = (1 << BIO_RW_META) | ((wbc->sync_mode == WB_SYNC_ALL ?
+ WRITE_SYNC_PLUG : WRITE));
+
+ BUG_ON(!PageLocked(page));
+ BUG_ON(!page_has_buffers(page));
+
+ head = page_buffers(page);
+ bh = head;
+
+ do {
+ if (!buffer_mapped(bh))
+ continue;
+ /*
+ * If it's a fully non-blocking write attempt and we cannot
+ * lock the buffer then redirty the page. Note that this can
+ * potentially cause a busy-wait loop from pdflush and kswapd
+ * activity, but those code paths have their own higher-level
+ * throttling.
+ */
+ if (wbc->sync_mode != WB_SYNC_NONE || !wbc->nonblocking) {
+ lock_buffer(bh);
+ } else if (!trylock_buffer(bh)) {
+ redirty_page_for_writepage(wbc, page);
+ continue;
+ }
+ if (test_clear_buffer_dirty(bh)) {
+ mark_buffer_async_write(bh);
+ } else {
+ unlock_buffer(bh);
+ }
+ } while ((bh = bh->b_this_page) != head);
+
+ /*
+ * The page and its buffers are protected by PageWriteback(), so we can
+ * drop the bh refcounts early.
+ */
+ BUG_ON(PageWriteback(page));
+ set_page_writeback(page);
+
+ do {
+ struct buffer_head *next = bh->b_this_page;
+ if (buffer_async_write(bh)) {
+ submit_bh(write_op, bh);
+ nr_underway++;
+ }
+ bh = next;
+ } while (bh != head);
+ unlock_page(page);
-static int gfs2_aspace_writepage(struct page *page,
- struct writeback_control *wbc)
-{
- return block_write_full_page(page, aspace_get_block, wbc);
+ err = 0;
+ if (nr_underway == 0)
+ end_page_writeback(page);
+
+ return err;
}
static const struct address_space_operations aspace_aops = {
}
/**
- * gfs2_meta_inval - Invalidate all buffers associated with a glock
- * @gl: the glock
- *
- */
-
-void gfs2_meta_inval(struct gfs2_glock *gl)
-{
- struct gfs2_sbd *sdp = gl->gl_sbd;
- struct inode *aspace = gl->gl_aspace;
- struct address_space *mapping = gl->gl_aspace->i_mapping;
-
- gfs2_assert_withdraw(sdp, !atomic_read(&gl->gl_ail_count));
-
- atomic_inc(&aspace->i_writecount);
- truncate_inode_pages(mapping, 0);
- atomic_dec(&aspace->i_writecount);
-
- gfs2_assert_withdraw(sdp, !mapping->nrpages);
-}
-
-/**
* gfs2_meta_sync - Sync all buffers associated with a glock
* @gl: The glock
*
}
/**
- * getbuf - Get a buffer with a given address space
+ * gfs2_getbuf - Get a buffer with a given address space
* @gl: the glock
* @blkno: the block number (filesystem scope)
* @create: 1 if the buffer should be created
* Returns: the buffer
*/
-static struct buffer_head *getbuf(struct gfs2_glock *gl, u64 blkno, int create)
+struct buffer_head *gfs2_getbuf(struct gfs2_glock *gl, u64 blkno, int create)
{
struct address_space *mapping = gl->gl_aspace->i_mapping;
struct gfs2_sbd *sdp = gl->gl_sbd;
struct buffer_head *gfs2_meta_new(struct gfs2_glock *gl, u64 blkno)
{
struct buffer_head *bh;
- bh = getbuf(gl, blkno, CREATE);
+ bh = gfs2_getbuf(gl, blkno, CREATE);
meta_prep_new(bh);
return bh;
}
int gfs2_meta_read(struct gfs2_glock *gl, u64 blkno, int flags,
struct buffer_head **bhp)
{
- *bhp = getbuf(gl, blkno, CREATE);
- if (!buffer_uptodate(*bhp)) {
- ll_rw_block(READ_META, 1, bhp);
- if (flags & DIO_WAIT) {
- int error = gfs2_meta_wait(gl->gl_sbd, *bhp);
- if (error) {
- brelse(*bhp);
- return error;
- }
- }
+ struct gfs2_sbd *sdp = gl->gl_sbd;
+ struct buffer_head *bh;
+
+ if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
+ return -EIO;
+
+ *bhp = bh = gfs2_getbuf(gl, blkno, CREATE);
+
+ lock_buffer(bh);
+ if (buffer_uptodate(bh)) {
+ unlock_buffer(bh);
+ return 0;
+ }
+ bh->b_end_io = end_buffer_read_sync;
+ get_bh(bh);
+ submit_bh(READ_SYNC | (1 << BIO_RW_META), bh);
+ if (!(flags & DIO_WAIT))
+ return 0;
+
+ wait_on_buffer(bh);
+ if (unlikely(!buffer_uptodate(bh))) {
+ struct gfs2_trans *tr = current->journal_info;
+ if (tr && tr->tr_touched)
+ gfs2_io_error_bh(sdp, bh);
+ brelse(bh);
+ return -EIO;
}
return 0;
struct buffer_head *bh;
while (blen) {
- bh = getbuf(ip->i_gl, bstart, NO_CREATE);
+ bh = gfs2_getbuf(ip->i_gl, bstart, NO_CREATE);
if (bh) {
lock_buffer(bh);
gfs2_log_lock(sdp);
if (extlen > max_ra)
extlen = max_ra;
- first_bh = getbuf(gl, dblock, CREATE);
+ first_bh = gfs2_getbuf(gl, dblock, CREATE);
if (buffer_uptodate(first_bh))
goto out;
if (!buffer_locked(first_bh))
- ll_rw_block(READ_META, 1, &first_bh);
+ ll_rw_block(READ_SYNC | (1 << BIO_RW_META), 1, &first_bh);
dblock++;
extlen--;
while (extlen) {
- bh = getbuf(gl, dblock, CREATE);
+ bh = gfs2_getbuf(gl, dblock, CREATE);
if (!buffer_uptodate(bh) && !buffer_locked(bh))
ll_rw_block(READA, 1, &bh);
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff