#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 = {
+const struct address_space_operations gfs2_meta_aops = {
.writepage = gfs2_aspace_writepage,
.releasepage = gfs2_releasepage,
.sync_page = block_sync_page,
};
/**
- * gfs2_aspace_get - Create and initialize a struct inode structure
- * @sdp: the filesystem the aspace is in
- *
- * Right now a struct inode is just a struct inode. Maybe Linux
- * will supply a more lightweight address space construct (that works)
- * in the future.
- *
- * Make sure pages/buffers in this aspace aren't in high memory.
- *
- * Returns: the aspace
- */
-
-struct inode *gfs2_aspace_get(struct gfs2_sbd *sdp)
-{
- struct inode *aspace;
- struct gfs2_inode *ip;
-
- aspace = new_inode(sdp->sd_vfs);
- if (aspace) {
- mapping_set_gfp_mask(aspace->i_mapping, GFP_NOFS);
- aspace->i_mapping->a_ops = &aspace_aops;
- aspace->i_size = ~0ULL;
- ip = GFS2_I(aspace);
- clear_bit(GIF_USER, &ip->i_flags);
- insert_inode_hash(aspace);
- }
- return aspace;
-}
-
-void gfs2_aspace_put(struct inode *aspace)
-{
- remove_inode_hash(aspace);
- iput(aspace);
-}
-
-/**
* gfs2_meta_sync - Sync all buffers associated with a glock
* @gl: The glock
*
void gfs2_meta_sync(struct gfs2_glock *gl)
{
- struct address_space *mapping = gl->gl_aspace->i_mapping;
+ struct address_space *mapping = gfs2_glock2aspace(gl);
int error;
filemap_fdatawrite(mapping);
struct buffer_head *gfs2_getbuf(struct gfs2_glock *gl, u64 blkno, int create)
{
- struct address_space *mapping = gl->gl_aspace->i_mapping;
+ struct address_space *mapping = gfs2_glock2aspace(gl);
struct gfs2_sbd *sdp = gl->gl_sbd;
struct page *page;
struct buffer_head *bh;
int gfs2_meta_read(struct gfs2_glock *gl, u64 blkno, int flags,
struct buffer_head **bhp)
{
- *bhp = gfs2_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;
void gfs2_remove_from_journal(struct buffer_head *bh, struct gfs2_trans *tr, int meta)
{
- struct gfs2_sbd *sdp = GFS2_SB(bh->b_page->mapping->host);
+ struct address_space *mapping = bh->b_page->mapping;
+ struct gfs2_sbd *sdp = gfs2_mapping2sbd(mapping);
struct gfs2_bufdata *bd = bh->b_private;
+
if (test_clear_buffer_pinned(bh)) {
list_del_init(&bd->bd_le.le_list);
if (meta) {
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--;
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff