/*
- * Copyright (c) 2000-2004 Silicon Graphics, Inc. All Rights Reserved.
+ * Copyright (c) 2000-2005 Silicon Graphics, Inc.
+ * All Rights Reserved.
*
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of version 2 of the GNU General Public License as
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation.
*
- * This program is distributed in the hope that it would be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ * This program is distributed in the hope that it would be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
*
- * Further, this software is distributed without any warranty that it is
- * free of the rightful claim of any third person regarding infringement
- * or the like. Any license provided herein, whether implied or
- * otherwise, applies only to this software file. Patent licenses, if
- * any, provided herein do not apply to combinations of this program with
- * other software, or any other product whatsoever.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; if not, write the Free Software Foundation, Inc., 59
- * Temple Place - Suite 330, Boston MA 02111-1307, USA.
- *
- * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
- * Mountain View, CA 94043, or:
- *
- * http://www.sgi.com
- *
- * For further information regarding this notice, see:
- *
- * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
-
#include "xfs.h"
-#include "xfs_inum.h"
+#include "xfs_bit.h"
#include "xfs_log.h"
+#include "xfs_inum.h"
#include "xfs_sb.h"
+#include "xfs_ag.h"
#include "xfs_dir.h"
#include "xfs_dir2.h"
#include "xfs_trans.h"
#include "xfs_bmap_btree.h"
#include "xfs_alloc_btree.h"
#include "xfs_ialloc_btree.h"
-#include "xfs_alloc.h"
-#include "xfs_btree.h"
-#include "xfs_attr_sf.h"
#include "xfs_dir_sf.h"
#include "xfs_dir2_sf.h"
+#include "xfs_attr_sf.h"
#include "xfs_dinode.h"
#include "xfs_inode.h"
+#include "xfs_alloc.h"
+#include "xfs_btree.h"
#include "xfs_error.h"
#include "xfs_rw.h"
#include "xfs_iomap.h"
#include <linux/mpage.h>
+#include <linux/pagevec.h>
#include <linux/writeback.h>
STATIC void xfs_count_page_state(struct page *, int *, int *, int *);
-STATIC void xfs_convert_page(struct inode *, struct page *, xfs_iomap_t *,
- struct writeback_control *wbc, void *, int, int);
#if defined(XFS_RW_TRACE)
void
int mask)
{
xfs_inode_t *ip;
- bhv_desc_t *bdp;
vnode_t *vp = LINVFS_GET_VP(inode);
loff_t isize = i_size_read(inode);
- loff_t offset = page->index << PAGE_CACHE_SHIFT;
+ loff_t offset = page_offset(page);
int delalloc = -1, unmapped = -1, unwritten = -1;
if (page_has_buffers(page))
xfs_count_page_state(page, &delalloc, &unmapped, &unwritten);
- bdp = vn_bhv_lookup(VN_BHV_HEAD(vp), &xfs_vnodeops);
- ip = XFS_BHVTOI(bdp);
+ ip = xfs_vtoi(vp);
if (!ip->i_rwtrace)
return;
#define xfs_page_trace(tag, inode, page, mask)
#endif
-void
-linvfs_unwritten_done(
- struct buffer_head *bh,
- int uptodate)
+/*
+ * Schedule IO completion handling on a xfsdatad if this was
+ * the final hold on this ioend.
+ */
+STATIC void
+xfs_finish_ioend(
+ xfs_ioend_t *ioend)
{
- xfs_buf_t *pb = (xfs_buf_t *)bh->b_private;
+ if (atomic_dec_and_test(&ioend->io_remaining))
+ queue_work(xfsdatad_workqueue, &ioend->io_work);
+}
- ASSERT(buffer_unwritten(bh));
- bh->b_end_io = NULL;
- clear_buffer_unwritten(bh);
- if (!uptodate)
- pagebuf_ioerror(pb, EIO);
- if (atomic_dec_and_test(&pb->pb_io_remaining) == 1) {
- pagebuf_iodone(pb, 1, 1);
+/*
+ * We're now finished for good with this ioend structure.
+ * Update the page state via the associated buffer_heads,
+ * release holds on the inode and bio, and finally free
+ * up memory. Do not use the ioend after this.
+ */
+STATIC void
+xfs_destroy_ioend(
+ xfs_ioend_t *ioend)
+{
+ struct buffer_head *bh, *next;
+
+ for (bh = ioend->io_buffer_head; bh; bh = next) {
+ next = bh->b_private;
+ bh->b_end_io(bh, ioend->io_uptodate);
}
- end_buffer_async_write(bh, uptodate);
+
+ vn_iowake(ioend->io_vnode);
+ mempool_free(ioend, xfs_ioend_pool);
}
/*
- * Issue transactions to convert a buffer range from unwritten
- * to written extents (buffered IO).
+ * Buffered IO write completion for delayed allocate extents.
+ * TODO: Update ondisk isize now that we know the file data
+ * has been flushed (i.e. the notorious "NULL file" problem).
*/
STATIC void
-linvfs_unwritten_convert(
- xfs_buf_t *bp)
+xfs_end_bio_delalloc(
+ void *data)
{
- vnode_t *vp = XFS_BUF_FSPRIVATE(bp, vnode_t *);
- int error;
+ xfs_ioend_t *ioend = data;
+
+ xfs_destroy_ioend(ioend);
+}
+
+/*
+ * Buffered IO write completion for regular, written extents.
+ */
+STATIC void
+xfs_end_bio_written(
+ void *data)
+{
+ xfs_ioend_t *ioend = data;
- BUG_ON(atomic_read(&bp->pb_hold) < 1);
- VOP_BMAP(vp, XFS_BUF_OFFSET(bp), XFS_BUF_SIZE(bp),
- BMAPI_UNWRITTEN, NULL, NULL, error);
- XFS_BUF_SET_FSPRIVATE(bp, NULL);
- XFS_BUF_CLR_IODONE_FUNC(bp);
- XFS_BUF_UNDATAIO(bp);
- iput(LINVFS_GET_IP(vp));
- pagebuf_iodone(bp, 0, 0);
+ xfs_destroy_ioend(ioend);
}
/*
+ * IO write completion for unwritten extents.
+ *
* Issue transactions to convert a buffer range from unwritten
- * to written extents (direct IO).
+ * to written extents.
*/
STATIC void
-linvfs_unwritten_convert_direct(
- struct inode *inode,
- loff_t offset,
- ssize_t size,
- void *private)
+xfs_end_bio_unwritten(
+ void *data)
+{
+ xfs_ioend_t *ioend = data;
+ vnode_t *vp = ioend->io_vnode;
+ xfs_off_t offset = ioend->io_offset;
+ size_t size = ioend->io_size;
+ int error;
+
+ if (ioend->io_uptodate)
+ VOP_BMAP(vp, offset, size, BMAPI_UNWRITTEN, NULL, NULL, error);
+ xfs_destroy_ioend(ioend);
+}
+
+/*
+ * Allocate and initialise an IO completion structure.
+ * We need to track unwritten extent write completion here initially.
+ * We'll need to extend this for updating the ondisk inode size later
+ * (vs. incore size).
+ */
+STATIC xfs_ioend_t *
+xfs_alloc_ioend(
+ struct inode *inode,
+ unsigned int type)
{
- ASSERT(!private || inode == (struct inode *)private);
+ xfs_ioend_t *ioend;
+
+ ioend = mempool_alloc(xfs_ioend_pool, GFP_NOFS);
- /* private indicates an unwritten extent lay beneath this IO,
- * see linvfs_get_block_core.
+ /*
+ * Set the count to 1 initially, which will prevent an I/O
+ * completion callback from happening before we have started
+ * all the I/O from calling the completion routine too early.
*/
- if (private && size > 0) {
- vnode_t *vp = LINVFS_GET_VP(inode);
- int error;
+ atomic_set(&ioend->io_remaining, 1);
+ ioend->io_uptodate = 1; /* cleared if any I/O fails */
+ ioend->io_list = NULL;
+ ioend->io_type = type;
+ ioend->io_vnode = LINVFS_GET_VP(inode);
+ ioend->io_buffer_head = NULL;
+ ioend->io_buffer_tail = NULL;
+ atomic_inc(&ioend->io_vnode->v_iocount);
+ ioend->io_offset = 0;
+ ioend->io_size = 0;
+
+ if (type == IOMAP_UNWRITTEN)
+ INIT_WORK(&ioend->io_work, xfs_end_bio_unwritten, ioend);
+ else if (type == IOMAP_DELAY)
+ INIT_WORK(&ioend->io_work, xfs_end_bio_delalloc, ioend);
+ else
+ INIT_WORK(&ioend->io_work, xfs_end_bio_written, ioend);
- VOP_BMAP(vp, offset, size, BMAPI_UNWRITTEN, NULL, NULL, error);
- }
+ return ioend;
}
STATIC int
struct inode *inode,
loff_t offset,
ssize_t count,
- xfs_iomap_t *iomapp,
+ xfs_iomap_t *mapp,
int flags)
{
vnode_t *vp = LINVFS_GET_VP(inode);
- int error, niomaps = 1;
-
- if (((flags & (BMAPI_DIRECT|BMAPI_SYNC)) == BMAPI_DIRECT) &&
- (offset >= i_size_read(inode)))
- count = max_t(ssize_t, count, XFS_WRITE_IO_LOG);
-retry:
- VOP_BMAP(vp, offset, count, flags, iomapp, &niomaps, error);
- if ((error == EAGAIN) || (error == EIO))
- return -error;
- if (unlikely((flags & (BMAPI_WRITE|BMAPI_DIRECT)) ==
- (BMAPI_WRITE|BMAPI_DIRECT) && niomaps &&
- (iomapp->iomap_flags & IOMAP_DELAY))) {
- flags = BMAPI_ALLOCATE;
- goto retry;
- }
- if (flags & (BMAPI_WRITE|BMAPI_ALLOCATE)) {
+ int error, nmaps = 1;
+
+ VOP_BMAP(vp, offset, count, flags, mapp, &nmaps, error);
+ if (!error && (flags & (BMAPI_WRITE|BMAPI_ALLOCATE)))
VMODIFY(vp);
- }
return -error;
}
+STATIC inline int
+xfs_iomap_valid(
+ xfs_iomap_t *iomapp,
+ loff_t offset)
+{
+ return offset >= iomapp->iomap_offset &&
+ offset < iomapp->iomap_offset + iomapp->iomap_bsize;
+}
+
/*
- * Finds the corresponding mapping in block @map array of the
- * given @offset within a @page.
+ * BIO completion handler for buffered IO.
*/
-STATIC xfs_iomap_t *
-xfs_offset_to_map(
+STATIC int
+xfs_end_bio(
+ struct bio *bio,
+ unsigned int bytes_done,
+ int error)
+{
+ xfs_ioend_t *ioend = bio->bi_private;
+
+ if (bio->bi_size)
+ return 1;
+
+ ASSERT(ioend);
+ ASSERT(atomic_read(&bio->bi_cnt) >= 1);
+
+ /* Toss bio and pass work off to an xfsdatad thread */
+ if (!test_bit(BIO_UPTODATE, &bio->bi_flags))
+ ioend->io_uptodate = 0;
+ bio->bi_private = NULL;
+ bio->bi_end_io = NULL;
+
+ bio_put(bio);
+ xfs_finish_ioend(ioend);
+ return 0;
+}
+
+STATIC void
+xfs_submit_ioend_bio(
+ xfs_ioend_t *ioend,
+ struct bio *bio)
+{
+ atomic_inc(&ioend->io_remaining);
+
+ bio->bi_private = ioend;
+ bio->bi_end_io = xfs_end_bio;
+
+ submit_bio(WRITE, bio);
+ ASSERT(!bio_flagged(bio, BIO_EOPNOTSUPP));
+ bio_put(bio);
+}
+
+STATIC struct bio *
+xfs_alloc_ioend_bio(
+ struct buffer_head *bh)
+{
+ struct bio *bio;
+ int nvecs = bio_get_nr_vecs(bh->b_bdev);
+
+ do {
+ bio = bio_alloc(GFP_NOIO, nvecs);
+ nvecs >>= 1;
+ } while (!bio);
+
+ ASSERT(bio->bi_private == NULL);
+ bio->bi_sector = bh->b_blocknr * (bh->b_size >> 9);
+ bio->bi_bdev = bh->b_bdev;
+ bio_get(bio);
+ return bio;
+}
+
+STATIC void
+xfs_start_buffer_writeback(
+ struct buffer_head *bh)
+{
+ ASSERT(buffer_mapped(bh));
+ ASSERT(buffer_locked(bh));
+ ASSERT(!buffer_delay(bh));
+ ASSERT(!buffer_unwritten(bh));
+
+ mark_buffer_async_write(bh);
+ set_buffer_uptodate(bh);
+ clear_buffer_dirty(bh);
+}
+
+STATIC void
+xfs_start_page_writeback(
struct page *page,
- xfs_iomap_t *iomapp,
- unsigned long offset)
+ struct writeback_control *wbc,
+ int clear_dirty,
+ int buffers)
{
- loff_t full_offset; /* offset from start of file */
+ ASSERT(PageLocked(page));
+ ASSERT(!PageWriteback(page));
+ set_page_writeback(page);
+ if (clear_dirty)
+ clear_page_dirty(page);
+ unlock_page(page);
+ if (!buffers) {
+ end_page_writeback(page);
+ wbc->pages_skipped++; /* We didn't write this page */
+ }
+}
+
+static inline int bio_add_buffer(struct bio *bio, struct buffer_head *bh)
+{
+ return bio_add_page(bio, bh->b_page, bh->b_size, bh_offset(bh));
+}
+
+/*
+ * Submit all of the bios for all of the ioends we have saved up, covering the
+ * initial writepage page and also any probed pages.
+ *
+ * Because we may have multiple ioends spanning a page, we need to start
+ * writeback on all the buffers before we submit them for I/O. If we mark the
+ * buffers as we got, then we can end up with a page that only has buffers
+ * marked async write and I/O complete on can occur before we mark the other
+ * buffers async write.
+ *
+ * The end result of this is that we trip a bug in end_page_writeback() because
+ * we call it twice for the one page as the code in end_buffer_async_write()
+ * assumes that all buffers on the page are started at the same time.
+ *
+ * The fix is two passes across the ioend list - one to start writeback on the
+ * bufferheads, and then the second one submit them for I/O.
+ */
+STATIC void
+xfs_submit_ioend(
+ xfs_ioend_t *ioend)
+{
+ xfs_ioend_t *head = ioend;
+ xfs_ioend_t *next;
+ struct buffer_head *bh;
+ struct bio *bio;
+ sector_t lastblock = 0;
+
+ /* Pass 1 - start writeback */
+ do {
+ next = ioend->io_list;
+ for (bh = ioend->io_buffer_head; bh; bh = bh->b_private) {
+ xfs_start_buffer_writeback(bh);
+ }
+ } while ((ioend = next) != NULL);
+
+ /* Pass 2 - submit I/O */
+ ioend = head;
+ do {
+ next = ioend->io_list;
+ bio = NULL;
+
+ for (bh = ioend->io_buffer_head; bh; bh = bh->b_private) {
+
+ if (!bio) {
+ retry:
+ bio = xfs_alloc_ioend_bio(bh);
+ } else if (bh->b_blocknr != lastblock + 1) {
+ xfs_submit_ioend_bio(ioend, bio);
+ goto retry;
+ }
+
+ if (bio_add_buffer(bio, bh) != bh->b_size) {
+ xfs_submit_ioend_bio(ioend, bio);
+ goto retry;
+ }
- ASSERT(offset < PAGE_CACHE_SIZE);
+ lastblock = bh->b_blocknr;
+ }
+ if (bio)
+ xfs_submit_ioend_bio(ioend, bio);
+ xfs_finish_ioend(ioend);
+ } while ((ioend = next) != NULL);
+}
+
+/*
+ * Cancel submission of all buffer_heads so far in this endio.
+ * Toss the endio too. Only ever called for the initial page
+ * in a writepage request, so only ever one page.
+ */
+STATIC void
+xfs_cancel_ioend(
+ xfs_ioend_t *ioend)
+{
+ xfs_ioend_t *next;
+ struct buffer_head *bh, *next_bh;
+
+ do {
+ next = ioend->io_list;
+ bh = ioend->io_buffer_head;
+ do {
+ next_bh = bh->b_private;
+ clear_buffer_async_write(bh);
+ unlock_buffer(bh);
+ } while ((bh = next_bh) != NULL);
+
+ vn_iowake(ioend->io_vnode);
+ mempool_free(ioend, xfs_ioend_pool);
+ } while ((ioend = next) != NULL);
+}
- full_offset = page->index; /* NB: using 64bit number */
- full_offset <<= PAGE_CACHE_SHIFT; /* offset from file start */
- full_offset += offset; /* offset from page start */
+/*
+ * Test to see if we've been building up a completion structure for
+ * earlier buffers -- if so, we try to append to this ioend if we
+ * can, otherwise we finish off any current ioend and start another.
+ * Return true if we've finished the given ioend.
+ */
+STATIC void
+xfs_add_to_ioend(
+ struct inode *inode,
+ struct buffer_head *bh,
+ xfs_off_t offset,
+ unsigned int type,
+ xfs_ioend_t **result,
+ int need_ioend)
+{
+ xfs_ioend_t *ioend = *result;
+
+ if (!ioend || need_ioend || type != ioend->io_type) {
+ xfs_ioend_t *previous = *result;
+
+ ioend = xfs_alloc_ioend(inode, type);
+ ioend->io_offset = offset;
+ ioend->io_buffer_head = bh;
+ ioend->io_buffer_tail = bh;
+ if (previous)
+ previous->io_list = ioend;
+ *result = ioend;
+ } else {
+ ioend->io_buffer_tail->b_private = bh;
+ ioend->io_buffer_tail = bh;
+ }
- if (full_offset < iomapp->iomap_offset)
- return NULL;
- if (iomapp->iomap_offset + (iomapp->iomap_bsize -1) >= full_offset)
- return iomapp;
- return NULL;
+ bh->b_private = NULL;
+ ioend->io_size += bh->b_size;
}
STATIC void
xfs_map_at_offset(
- struct page *page,
struct buffer_head *bh,
- unsigned long offset,
+ loff_t offset,
int block_bits,
xfs_iomap_t *iomapp)
{
xfs_daddr_t bn;
- loff_t delta;
int sector_shift;
ASSERT(!(iomapp->iomap_flags & IOMAP_HOLE));
ASSERT(!(iomapp->iomap_flags & IOMAP_DELAY));
ASSERT(iomapp->iomap_bn != IOMAP_DADDR_NULL);
- delta = page->index;
- delta <<= PAGE_CACHE_SHIFT;
- delta += offset;
- delta -= iomapp->iomap_offset;
- delta >>= block_bits;
-
sector_shift = block_bits - BBSHIFT;
- bn = iomapp->iomap_bn >> sector_shift;
- bn += delta;
+ bn = (iomapp->iomap_bn >> sector_shift) +
+ ((offset - iomapp->iomap_offset) >> block_bits);
+
+ ASSERT(bn || (iomapp->iomap_flags & IOMAP_REALTIME));
ASSERT((bn << sector_shift) >= iomapp->iomap_bn);
lock_buffer(bh);
bh->b_blocknr = bn;
- bh->b_bdev = iomapp->iomap_target->pbr_bdev;
+ bh->b_bdev = iomapp->iomap_target->bt_bdev;
set_buffer_mapped(bh);
clear_buffer_delay(bh);
+ clear_buffer_unwritten(bh);
}
/*
- * Look for a page at index which is unlocked and contains our
- * unwritten extent flagged buffers at its head. Returns page
- * locked and with an extra reference count, and length of the
- * unwritten extent component on this page that we can write,
- * in units of filesystem blocks.
- */
-STATIC struct page *
-xfs_probe_unwritten_page(
- struct address_space *mapping,
- pgoff_t index,
- xfs_iomap_t *iomapp,
- xfs_buf_t *pb,
- unsigned long max_offset,
- unsigned long *fsbs,
- unsigned int bbits)
-{
- struct page *page;
-
- page = find_trylock_page(mapping, index);
- if (!page)
- return 0;
- if (PageWriteback(page))
- goto out;
-
- if (page->mapping && page_has_buffers(page)) {
- struct buffer_head *bh, *head;
- unsigned long p_offset = 0;
-
- *fsbs = 0;
- bh = head = page_buffers(page);
- do {
- if (!buffer_unwritten(bh))
- break;
- if (!xfs_offset_to_map(page, iomapp, p_offset))
- break;
- if (p_offset >= max_offset)
- break;
- xfs_map_at_offset(page, bh, p_offset, bbits, iomapp);
- set_buffer_unwritten_io(bh);
- bh->b_private = pb;
- p_offset += bh->b_size;
- (*fsbs)++;
- } while ((bh = bh->b_this_page) != head);
-
- if (p_offset)
- return page;
- }
-
-out:
- unlock_page(page);
- return NULL;
-}
-
-/*
- * Look for a page at index which is unlocked and not mapped
- * yet - clustering for mmap write case.
+ * Look for a page at index that is suitable for clustering.
*/
STATIC unsigned int
-xfs_probe_unmapped_page(
- struct address_space *mapping,
- pgoff_t index,
- unsigned int pg_offset)
+xfs_probe_page(
+ struct page *page,
+ unsigned int pg_offset,
+ int mapped)
{
- struct page *page;
int ret = 0;
- page = find_trylock_page(mapping, index);
- if (!page)
- return 0;
if (PageWriteback(page))
- goto out;
+ return 0;
if (page->mapping && PageDirty(page)) {
if (page_has_buffers(page)) {
bh = head = page_buffers(page);
do {
- if (buffer_mapped(bh) || !buffer_uptodate(bh))
+ if (!buffer_uptodate(bh))
+ break;
+ if (mapped != buffer_mapped(bh))
break;
ret += bh->b_size;
if (ret >= pg_offset)
break;
} while ((bh = bh->b_this_page) != head);
} else
- ret = PAGE_CACHE_SIZE;
+ ret = mapped ? 0 : PAGE_CACHE_SIZE;
}
-out:
- unlock_page(page);
return ret;
}
-STATIC unsigned int
-xfs_probe_unmapped_cluster(
+STATIC size_t
+xfs_probe_cluster(
struct inode *inode,
struct page *startpage,
struct buffer_head *bh,
- struct buffer_head *head)
+ struct buffer_head *head,
+ int mapped)
{
+ struct pagevec pvec;
pgoff_t tindex, tlast, tloff;
- unsigned int pg_offset, len, total = 0;
- struct address_space *mapping = inode->i_mapping;
+ size_t total = 0;
+ int done = 0, i;
/* First sum forwards in this page */
do {
- if (buffer_mapped(bh))
- break;
+ if (!buffer_uptodate(bh) || (mapped != 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.
- */
- if (bh == head) {
- tlast = i_size_read(inode) >> PAGE_CACHE_SHIFT;
- /* Prune this back to avoid pathological behavior */
- tloff = min(tlast, startpage->index + 64);
- for (tindex = startpage->index + 1; tindex < tloff; tindex++) {
- len = xfs_probe_unmapped_page(mapping, tindex,
- PAGE_CACHE_SIZE);
- if (!len)
- return total;
+ /* 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, 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 && !TestSetPageLocked(page)) {
+ len = xfs_probe_page(page, pg_offset, mapped);
+ unlock_page(page);
+ }
+
+ if (!len) {
+ done = 1;
+ break;
+ }
+
total += len;
+ tindex++;
}
- if (tindex == tlast &&
- (pg_offset = i_size_read(inode) & (PAGE_CACHE_SIZE - 1))) {
- total += xfs_probe_unmapped_page(mapping,
- tindex, pg_offset);
- }
+
+ pagevec_release(&pvec);
+ cond_resched();
}
+
return total;
}
/*
- * Probe for a given page (index) in the inode and test if it is delayed
- * and without unwritten buffers. Returns page locked and with an extra
- * reference count.
+ * Test if a given page is suitable for writing as part of an unwritten
+ * or delayed allocate extent.
*/
-STATIC struct page *
-xfs_probe_delalloc_page(
- struct inode *inode,
- pgoff_t index)
+STATIC int
+xfs_is_delayed_page(
+ struct page *page,
+ unsigned int type)
{
- struct page *page;
-
- page = find_trylock_page(inode->i_mapping, index);
- if (!page)
- return NULL;
if (PageWriteback(page))
- goto out;
+ return 0;
if (page->mapping && page_has_buffers(page)) {
struct buffer_head *bh, *head;
bh = head = page_buffers(page);
do {
- if (buffer_unwritten(bh)) {
- acceptable = 0;
+ if (buffer_unwritten(bh))
+ acceptable = (type == IOMAP_UNWRITTEN);
+ else if (buffer_delay(bh))
+ acceptable = (type == IOMAP_DELAY);
+ else if (buffer_dirty(bh) && buffer_mapped(bh))
+ acceptable = (type == 0);
+ else
break;
- } else if (buffer_delay(bh)) {
- acceptable = 1;
- }
} while ((bh = bh->b_this_page) != head);
if (acceptable)
- return page;
- }
-
-out:
- unlock_page(page);
- return NULL;
-}
-
-STATIC int
-xfs_map_unwritten(
- struct inode *inode,
- struct page *start_page,
- struct buffer_head *head,
- struct buffer_head *curr,
- unsigned long p_offset,
- int block_bits,
- xfs_iomap_t *iomapp,
- struct writeback_control *wbc,
- int startio,
- int all_bh)
-{
- struct buffer_head *bh = curr;
- xfs_iomap_t *tmp;
- xfs_buf_t *pb;
- loff_t offset, size;
- unsigned long nblocks = 0;
-
- offset = start_page->index;
- offset <<= PAGE_CACHE_SHIFT;
- offset += p_offset;
-
- /* get an "empty" pagebuf to manage IO completion
- * Proper values will be set before returning */
- pb = pagebuf_lookup(iomapp->iomap_target, 0, 0, 0);
- if (!pb)
- return -EAGAIN;
-
- /* Take a reference to the inode to prevent it from
- * being reclaimed while we have outstanding unwritten
- * extent IO on it.
- */
- if ((igrab(inode)) != inode) {
- pagebuf_free(pb);
- return -EAGAIN;
- }
-
- /* Set the count to 1 initially, this will stop an I/O
- * completion callout which happens before we have started
- * all the I/O from calling pagebuf_iodone too early.
- */
- atomic_set(&pb->pb_io_remaining, 1);
-
- /* First map forwards in the page consecutive buffers
- * covering this unwritten extent
- */
- do {
- if (!buffer_unwritten(bh))
- break;
- tmp = xfs_offset_to_map(start_page, iomapp, p_offset);
- if (!tmp)
- break;
- xfs_map_at_offset(start_page, bh, p_offset, block_bits, iomapp);
- set_buffer_unwritten_io(bh);
- bh->b_private = pb;
- p_offset += bh->b_size;
- nblocks++;
- } while ((bh = bh->b_this_page) != head);
-
- atomic_add(nblocks, &pb->pb_io_remaining);
-
- /* If we reached the end of the page, map forwards in any
- * following pages which are also covered by this extent.
- */
- if (bh == head) {
- struct address_space *mapping = inode->i_mapping;
- pgoff_t tindex, tloff, tlast;
- unsigned long bs;
- unsigned int pg_offset, bbits = inode->i_blkbits;
- struct page *page;
-
- tlast = i_size_read(inode) >> PAGE_CACHE_SHIFT;
- tloff = (iomapp->iomap_offset + iomapp->iomap_bsize) >> PAGE_CACHE_SHIFT;
- tloff = min(tlast, tloff);
- for (tindex = start_page->index + 1; tindex < tloff; tindex++) {
- page = xfs_probe_unwritten_page(mapping,
- tindex, iomapp, pb,
- PAGE_CACHE_SIZE, &bs, bbits);
- if (!page)
- break;
- nblocks += bs;
- atomic_add(bs, &pb->pb_io_remaining);
- xfs_convert_page(inode, page, iomapp, wbc, pb,
- startio, all_bh);
- /* stop if converting the next page might add
- * enough blocks that the corresponding byte
- * count won't fit in our ulong page buf length */
- if (nblocks >= ((ULONG_MAX - PAGE_SIZE) >> block_bits))
- goto enough;
- }
-
- if (tindex == tlast &&
- (pg_offset = (i_size_read(inode) & (PAGE_CACHE_SIZE - 1)))) {
- page = xfs_probe_unwritten_page(mapping,
- tindex, iomapp, pb,
- pg_offset, &bs, bbits);
- if (page) {
- nblocks += bs;
- atomic_add(bs, &pb->pb_io_remaining);
- xfs_convert_page(inode, page, iomapp, wbc, pb,
- startio, all_bh);
- if (nblocks >= ((ULONG_MAX - PAGE_SIZE) >> block_bits))
- goto enough;
- }
- }
- }
-
-enough:
- size = nblocks; /* NB: using 64bit number here */
- size <<= block_bits; /* convert fsb's to byte range */
-
- XFS_BUF_DATAIO(pb);
- XFS_BUF_ASYNC(pb);
- XFS_BUF_SET_SIZE(pb, size);
- XFS_BUF_SET_COUNT(pb, size);
- XFS_BUF_SET_OFFSET(pb, offset);
- XFS_BUF_SET_FSPRIVATE(pb, LINVFS_GET_VP(inode));
- XFS_BUF_SET_IODONE_FUNC(pb, linvfs_unwritten_convert);
-
- if (atomic_dec_and_test(&pb->pb_io_remaining) == 1) {
- pagebuf_iodone(pb, 1, 1);
+ return 1;
}
return 0;
}
-STATIC void
-xfs_submit_page(
- struct page *page,
- struct buffer_head *bh_arr[],
- int cnt)
-{
- struct buffer_head *bh;
- int i;
-
- BUG_ON(PageWriteback(page));
- set_page_writeback(page);
- clear_page_dirty(page);
- unlock_page(page);
-
- if (cnt) {
- for (i = 0; i < cnt; i++) {
- bh = bh_arr[i];
- mark_buffer_async_write(bh);
- if (buffer_unwritten(bh))
- set_buffer_unwritten_io(bh);
- set_buffer_uptodate(bh);
- clear_buffer_dirty(bh);
- }
-
- for (i = 0; i < cnt; i++)
- submit_bh(WRITE, bh_arr[i]);
- } else
- end_page_writeback(page);
-}
-
/*
* Allocate & map buffers for page given the extent map. Write it out.
* except for the original page of a writepage, this is called on
* delalloc/unwritten pages only, for the original page it is possible
* that the page has no mapping at all.
*/
-STATIC void
+STATIC int
xfs_convert_page(
struct inode *inode,
struct page *page,
- xfs_iomap_t *iomapp,
+ loff_t tindex,
+ xfs_iomap_t *mp,
+ xfs_ioend_t **ioendp,
struct writeback_control *wbc,
- void *private,
int startio,
int all_bh)
{
- struct buffer_head *bh_arr[MAX_BUF_PER_PAGE], *bh, *head;
- xfs_iomap_t *mp = iomapp, *tmp;
- unsigned long end, offset;
- pgoff_t end_index;
- int i = 0, index = 0;
+ struct buffer_head *bh, *head;
+ xfs_off_t end_offset;
+ unsigned long p_offset;
+ unsigned int type;
int bbits = inode->i_blkbits;
+ int len, page_dirty;
+ int count = 0, done = 0, uptodate = 1;
+ xfs_off_t offset = page_offset(page);
+
+ if (page->index != tindex)
+ goto fail;
+ if (TestSetPageLocked(page))
+ goto fail;
+ if (PageWriteback(page))
+ goto fail_unlock_page;
+ if (page->mapping != inode->i_mapping)
+ goto fail_unlock_page;
+ if (!xfs_is_delayed_page(page, (*ioendp)->io_type))
+ goto fail_unlock_page;
+
+ /*
+ * page_dirty is initially a count of buffers on the page before
+ * EOF and is decrememted as we move each into a cleanable state.
+ *
+ * Derivation:
+ *
+ * End offset is the highest offset that this page should represent.
+ * If we are on the last page, (end_offset & (PAGE_CACHE_SIZE - 1))
+ * will evaluate non-zero and be less than PAGE_CACHE_SIZE and
+ * hence give us the correct page_dirty count. On any other page,
+ * it will be zero and in that case we need page_dirty to be the
+ * count of buffers on the page.
+ */
+ end_offset = min_t(unsigned long long,
+ (xfs_off_t)(page->index + 1) << PAGE_CACHE_SHIFT,
+ i_size_read(inode));
+
+ len = 1 << inode->i_blkbits;
+ p_offset = min_t(unsigned long, end_offset & (PAGE_CACHE_SIZE - 1),
+ PAGE_CACHE_SIZE);
+ p_offset = p_offset ? roundup(p_offset, len) : PAGE_CACHE_SIZE;
+ page_dirty = p_offset / len;
- end_index = i_size_read(inode) >> PAGE_CACHE_SHIFT;
- if (page->index < end_index) {
- end = PAGE_CACHE_SIZE;
- } else {
- end = i_size_read(inode) & (PAGE_CACHE_SIZE-1);
- }
bh = head = page_buffers(page);
do {
- offset = i << bbits;
- if (!(PageUptodate(page) || buffer_uptodate(bh)))
- continue;
- if (buffer_mapped(bh) && all_bh &&
- !buffer_unwritten(bh) && !buffer_delay(bh)) {
- if (startio && (offset < end)) {
- lock_buffer(bh);
- bh_arr[index++] = bh;
- }
+ if (offset >= end_offset)
+ break;
+ if (!buffer_uptodate(bh))
+ uptodate = 0;
+ if (!(PageUptodate(page) || buffer_uptodate(bh))) {
+ done = 1;
continue;
}
- tmp = xfs_offset_to_map(page, mp, offset);
- if (!tmp)
- continue;
- ASSERT(!(tmp->iomap_flags & IOMAP_HOLE));
- ASSERT(!(tmp->iomap_flags & IOMAP_DELAY));
- /* If this is a new unwritten extent buffer (i.e. one
- * that we haven't passed in private data for, we must
- * now map this buffer too.
- */
- if (buffer_unwritten(bh) && !bh->b_end_io) {
- ASSERT(tmp->iomap_flags & IOMAP_UNWRITTEN);
- xfs_map_unwritten(inode, page, head, bh, offset,
- bbits, tmp, wbc, startio, all_bh);
- } else if (! (buffer_unwritten(bh) && buffer_locked(bh))) {
- xfs_map_at_offset(page, bh, offset, bbits, tmp);
- if (buffer_unwritten(bh)) {
- set_buffer_unwritten_io(bh);
- bh->b_private = private;
- ASSERT(private);
+ if (buffer_unwritten(bh) || buffer_delay(bh)) {
+ if (buffer_unwritten(bh))
+ type = IOMAP_UNWRITTEN;
+ else
+ type = IOMAP_DELAY;
+
+ if (!xfs_iomap_valid(mp, offset)) {
+ done = 1;
+ continue;
}
- }
- if (startio && (offset < end)) {
- bh_arr[index++] = bh;
+
+ ASSERT(!(mp->iomap_flags & IOMAP_HOLE));
+ ASSERT(!(mp->iomap_flags & IOMAP_DELAY));
+
+ xfs_map_at_offset(bh, offset, bbits, mp);
+ if (startio) {
+ xfs_add_to_ioend(inode, bh, offset,
+ type, ioendp, done);
+ } else {
+ set_buffer_dirty(bh);
+ unlock_buffer(bh);
+ mark_buffer_dirty(bh);
+ }
+ page_dirty--;
+ count++;
} else {
- set_buffer_dirty(bh);
- unlock_buffer(bh);
- mark_buffer_dirty(bh);
+ type = 0;
+ if (buffer_mapped(bh) && all_bh && startio) {
+ lock_buffer(bh);
+ xfs_add_to_ioend(inode, bh, offset,
+ type, ioendp, done);
+ count++;
+ page_dirty--;
+ } else {
+ done = 1;
+ }
}
- } while (i++, (bh = bh->b_this_page) != head);
+ } while (offset += len, (bh = bh->b_this_page) != head);
+
+ if (uptodate && bh == head)
+ SetPageUptodate(page);
if (startio) {
- wbc->nr_to_write--;
- xfs_submit_page(page, bh_arr, index);
- } else {
- unlock_page(page);
+ if (count) {
+ struct backing_dev_info *bdi;
+
+ bdi = inode->i_mapping->backing_dev_info;
+ wbc->nr_to_write--;
+ if (bdi_write_congested(bdi)) {
+ wbc->encountered_congestion = 1;
+ done = 1;
+ } else if (wbc->nr_to_write <= 0) {
+ done = 1;
+ }
+ }
+ xfs_start_page_writeback(page, wbc, !page_dirty, count);
}
+
+ return done;
+ fail_unlock_page:
+ unlock_page(page);
+ fail:
+ return 1;
}
/*
struct inode *inode,
pgoff_t tindex,
xfs_iomap_t *iomapp,
+ xfs_ioend_t **ioendp,
struct writeback_control *wbc,
int startio,
- int all_bh)
+ int all_bh,
+ pgoff_t tlast)
{
- pgoff_t tlast;
- struct page *page;
+ struct pagevec pvec;
+ int done = 0, i;
+
+ pagevec_init(&pvec, 0);
+ while (!done && tindex <= tlast) {
+ unsigned len = min_t(pgoff_t, PAGEVEC_SIZE, tlast - tindex + 1);
- tlast = (iomapp->iomap_offset + iomapp->iomap_bsize) >> PAGE_CACHE_SHIFT;
- for (; tindex < tlast; tindex++) {
- page = xfs_probe_delalloc_page(inode, tindex);
- if (!page)
+ if (!pagevec_lookup(&pvec, inode->i_mapping, tindex, len))
break;
- xfs_convert_page(inode, page, iomapp, wbc, NULL,
- startio, all_bh);
+
+ for (i = 0; i < pagevec_count(&pvec); i++) {
+ done = xfs_convert_page(inode, pvec.pages[i], tindex++,
+ iomapp, ioendp, wbc, startio, all_bh);
+ if (done)
+ break;
+ }
+
+ pagevec_release(&pvec);
+ cond_resched();
}
}
int startio,
int unmapped) /* also implies page uptodate */
{
- struct buffer_head *bh_arr[MAX_BUF_PER_PAGE], *bh, *head;
- xfs_iomap_t *iomp, iomap;
- unsigned long p_offset = 0;
- pgoff_t end_index;
+ struct buffer_head *bh, *head;
+ xfs_iomap_t iomap;
+ xfs_ioend_t *ioend = NULL, *iohead = NULL;
loff_t offset;
- unsigned long long end_offset;
- int len, err, i, cnt = 0, uptodate = 1;
- int flags = startio ? 0 : BMAPI_TRYLOCK;
- int page_dirty = 1;
-
-
- /* Are we off the end of the file ? */
- end_index = i_size_read(inode) >> PAGE_CACHE_SHIFT;
+ unsigned long p_offset = 0;
+ unsigned int type;
+ __uint64_t end_offset;
+ pgoff_t end_index, last_index, tlast;
+ ssize_t size, len;
+ int flags, err, iomap_valid = 0, uptodate = 1;
+ int page_dirty, count = 0, trylock_flag = 0;
+ int all_bh = unmapped;
+
+ /* wait for other IO threads? */
+ if (startio && (wbc->sync_mode == WB_SYNC_NONE && wbc->nonblocking))
+ trylock_flag |= BMAPI_TRYLOCK;
+
+ /* Is this page beyond the end of the file? */
+ offset = i_size_read(inode);
+ end_index = offset >> PAGE_CACHE_SHIFT;
+ last_index = (offset - 1) >> PAGE_CACHE_SHIFT;
if (page->index >= end_index) {
if ((page->index >= end_index + 1) ||
!(i_size_read(inode) & (PAGE_CACHE_SIZE - 1))) {
- err = -EIO;
- goto error;
+ if (startio)
+ unlock_page(page);
+ return 0;
}
}
- offset = (loff_t)page->index << PAGE_CACHE_SHIFT;
+ /*
+ * page_dirty is initially a count of buffers on the page before
+ * EOF and is decrememted as we move each into a cleanable state.
+ *
+ * Derivation:
+ *
+ * End offset is the highest offset that this page should represent.
+ * If we are on the last page, (end_offset & (PAGE_CACHE_SIZE - 1))
+ * will evaluate non-zero and be less than PAGE_CACHE_SIZE and
+ * hence give us the correct page_dirty count. On any other page,
+ * it will be zero and in that case we need page_dirty to be the
+ * count of buffers on the page.
+ */
end_offset = min_t(unsigned long long,
- offset + PAGE_CACHE_SIZE, i_size_read(inode));
+ (xfs_off_t)(page->index + 1) << PAGE_CACHE_SHIFT, offset);
+ len = 1 << inode->i_blkbits;
+ p_offset = min_t(unsigned long, end_offset & (PAGE_CACHE_SIZE - 1),
+ PAGE_CACHE_SIZE);
+ p_offset = p_offset ? roundup(p_offset, len) : PAGE_CACHE_SIZE;
+ page_dirty = p_offset / len;
bh = head = page_buffers(page);
- iomp = NULL;
+ offset = page_offset(page);
+ flags = -1;
+ type = 0;
+
+ /* TODO: cleanup count and page_dirty */
- len = bh->b_size;
do {
if (offset >= end_offset)
break;
if (!buffer_uptodate(bh))
uptodate = 0;
- if (!(PageUptodate(page) || buffer_uptodate(bh)) && !startio)
+ if (!(PageUptodate(page) || buffer_uptodate(bh)) && !startio) {
+ /*
+ * the iomap is actually still valid, but the ioend
+ * isn't. shouldn't happen too often.
+ */
+ iomap_valid = 0;
continue;
-
- if (iomp) {
- iomp = xfs_offset_to_map(page, &iomap, p_offset);
}
+ if (iomap_valid)
+ iomap_valid = xfs_iomap_valid(&iomap, offset);
+
/*
* First case, map an unwritten extent and prepare for
* extent state conversion transaction on completion.
- */
- if (buffer_unwritten(bh)) {
- if (!iomp) {
- err = xfs_map_blocks(inode, offset, len, &iomap,
- BMAPI_READ|BMAPI_IGNSTATE);
- if (err) {
- goto error;
- }
- iomp = xfs_offset_to_map(page, &iomap,
- p_offset);
- }
- if (iomp && startio) {
- if (!bh->b_end_io) {
- err = xfs_map_unwritten(inode, page,
- head, bh, p_offset,
- inode->i_blkbits, iomp,
- wbc, startio, unmapped);
- if (err) {
- goto error;
- }
- }
- bh_arr[cnt++] = bh;
- page_dirty = 0;
- }
- /*
+ *
* Second case, allocate space for a delalloc buffer.
* We can return EAGAIN here in the release page case.
- */
- } else if (buffer_delay(bh)) {
- if (!iomp) {
- err = xfs_map_blocks(inode, offset, len, &iomap,
- BMAPI_ALLOCATE | flags);
- if (err) {
- goto error;
+ *
+ * Third case, an unmapped buffer was found, and we are
+ * in a path where we need to write the whole page out.
+ */
+ if (buffer_unwritten(bh) || buffer_delay(bh) ||
+ ((buffer_uptodate(bh) || PageUptodate(page)) &&
+ !buffer_mapped(bh) && (unmapped || startio))) {
+ /*
+ * Make sure we don't use a read-only iomap
+ */
+ if (flags == BMAPI_READ)
+ iomap_valid = 0;
+
+ if (buffer_unwritten(bh)) {
+ type = IOMAP_UNWRITTEN;
+ flags = BMAPI_WRITE|BMAPI_IGNSTATE;
+ } else if (buffer_delay(bh)) {
+ type = IOMAP_DELAY;
+ flags = BMAPI_ALLOCATE;
+ if (!startio)
+ flags |= trylock_flag;
+ } else {
+ type = IOMAP_NEW;
+ flags = BMAPI_WRITE|BMAPI_MMAP;
+ }
+
+ if (!iomap_valid) {
+ if (type == IOMAP_NEW) {
+ size = xfs_probe_cluster(inode,
+ page, bh, head, 0);
+ } else {
+ size = len;
}
- iomp = xfs_offset_to_map(page, &iomap,
- p_offset);
+
+ err = xfs_map_blocks(inode, offset, size,
+ &iomap, flags);
+ if (err)
+ goto error;
+ iomap_valid = xfs_iomap_valid(&iomap, offset);
}
- if (iomp) {
- xfs_map_at_offset(page, bh, p_offset,
- inode->i_blkbits, iomp);
+ if (iomap_valid) {
+ xfs_map_at_offset(bh, offset,
+ inode->i_blkbits, &iomap);
if (startio) {
- bh_arr[cnt++] = bh;
+ xfs_add_to_ioend(inode, bh, offset,
+ type, &ioend,
+ !iomap_valid);
} else {
set_buffer_dirty(bh);
unlock_buffer(bh);
mark_buffer_dirty(bh);
}
- page_dirty = 0;
+ page_dirty--;
+ count++;
+ }
+ } else if (buffer_uptodate(bh) && startio) {
+ /*
+ * we got here because the buffer is already mapped.
+ * That means it must already have extents allocated
+ * underneath it. Map the extent by reading it.
+ */
+ if (!iomap_valid || type != 0) {
+ flags = BMAPI_READ;
+ size = xfs_probe_cluster(inode, page, bh,
+ head, 1);
+ err = xfs_map_blocks(inode, offset, size,
+ &iomap, flags);
+ if (err)
+ goto error;
+ iomap_valid = xfs_iomap_valid(&iomap, offset);
}
- } else if ((buffer_uptodate(bh) || PageUptodate(page)) &&
- (unmapped || startio)) {
- if (!buffer_mapped(bh)) {
- int size;
-
- /*
- * Getting here implies an unmapped buffer
- * was found, and we are in a path where we
- * need to write the whole page out.
- */
- if (!iomp) {
- size = xfs_probe_unmapped_cluster(
- inode, page, bh, head);
- err = xfs_map_blocks(inode, offset,
- size, &iomap,
- BMAPI_WRITE|BMAPI_MMAP);
- if (err) {
- goto error;
- }
- iomp = xfs_offset_to_map(page, &iomap,
- p_offset);
- }
- if (iomp) {
- xfs_map_at_offset(page,
- bh, p_offset,
- inode->i_blkbits, iomp);
- if (startio) {
- bh_arr[cnt++] = bh;
- } else {
- set_buffer_dirty(bh);
- unlock_buffer(bh);
- mark_buffer_dirty(bh);
- }
- page_dirty = 0;
- }
- } else if (startio) {
- if (buffer_uptodate(bh) &&
- !test_and_set_bit(BH_Lock, &bh->b_state)) {
- bh_arr[cnt++] = bh;
- page_dirty = 0;
- }
+ type = 0;
+ if (!test_and_set_bit(BH_Lock, &bh->b_state)) {
+ ASSERT(buffer_mapped(bh));
+ if (iomap_valid)
+ all_bh = 1;
+ xfs_add_to_ioend(inode, bh, offset, type,
+ &ioend, !iomap_valid);
+ page_dirty--;
+ count++;
+ } else {
+ iomap_valid = 0;
}
+ } else if ((buffer_uptodate(bh) || PageUptodate(page)) &&
+ (unmapped || startio)) {
+ iomap_valid = 0;
}
- } while (offset += len, p_offset += len,
- ((bh = bh->b_this_page) != head));
+
+ if (!iohead)
+ iohead = ioend;
+
+ } while (offset += len, ((bh = bh->b_this_page) != head));
if (uptodate && bh == head)
SetPageUptodate(page);
if (startio)
- xfs_submit_page(page, bh_arr, cnt);
-
- if (iomp) {
- xfs_cluster_write(inode, page->index + 1, iomp, wbc,
- startio, unmapped);
+ xfs_start_page_writeback(page, wbc, 1, count);
+
+ if (ioend && iomap_valid) {
+ offset = (iomap.iomap_offset + iomap.iomap_bsize - 1) >>
+ PAGE_CACHE_SHIFT;
+ tlast = min_t(pgoff_t, offset, last_index);
+ xfs_cluster_write(inode, page->index + 1, &iomap, &ioend,
+ wbc, startio, all_bh, tlast);
}
+ if (iohead)
+ xfs_submit_ioend(iohead);
+
return page_dirty;
error:
- for (i = 0; i < cnt; i++) {
- unlock_buffer(bh_arr[i]);
- }
+ if (iohead)
+ xfs_cancel_ioend(iohead);
/*
* If it's delalloc and we have nowhere to put it,
* us to try again.
*/
if (err != -EAGAIN) {
- if (!unmapped) {
+ if (!unmapped)
block_invalidatepage(page, 0);
- }
ClearPageUptodate(page);
}
return err;
}
STATIC int
-linvfs_get_block_core(
+__linvfs_get_block(
struct inode *inode,
sector_t iblock,
unsigned long blocks,
{
vnode_t *vp = LINVFS_GET_VP(inode);
xfs_iomap_t iomap;
+ xfs_off_t offset;
+ ssize_t size;
int retpbbm = 1;
int error;
- ssize_t size;
- loff_t offset = (loff_t)iblock << inode->i_blkbits;
+ offset = (xfs_off_t)iblock << inode->i_blkbits;
if (blocks)
- size = blocks << inode->i_blkbits;
+ size = (ssize_t) min_t(xfs_off_t, LONG_MAX,
+ (xfs_off_t)blocks << inode->i_blkbits);
else
size = 1 << inode->i_blkbits;
return 0;
if (iomap.iomap_bn != IOMAP_DADDR_NULL) {
- xfs_daddr_t bn;
- loff_t delta;
+ xfs_daddr_t bn;
+ xfs_off_t delta;
/* For unwritten extents do not report a disk address on
* the read case (treat as if we're reading into a hole).
bn = iomap.iomap_bn >> (inode->i_blkbits - BBSHIFT);
bn += delta;
-
+ BUG_ON(!bn && !(iomap.iomap_flags & IOMAP_REALTIME));
bh_result->b_blocknr = bn;
- bh_result->b_bdev = iomap.iomap_target->pbr_bdev;
set_buffer_mapped(bh_result);
}
if (create && (iomap.iomap_flags & IOMAP_UNWRITTEN)) {
}
/* If this is a realtime file, data might be on a new device */
- bh_result->b_bdev = iomap.iomap_target->pbr_bdev;
+ bh_result->b_bdev = iomap.iomap_target->bt_bdev;
/* If we previously allocated a block out beyond eof and
* we are now coming back to use it then we will need to
*/
if (create &&
((!buffer_mapped(bh_result) && !buffer_uptodate(bh_result)) ||
- (offset >= i_size_read(inode)) || (iomap.iomap_flags & IOMAP_NEW))) {
+ (offset >= i_size_read(inode)) || (iomap.iomap_flags & IOMAP_NEW)))
set_buffer_new(bh_result);
- }
if (iomap.iomap_flags & IOMAP_DELAY) {
- if (unlikely(direct))
- BUG();
+ BUG_ON(direct);
if (create) {
- set_buffer_mapped(bh_result);
set_buffer_uptodate(bh_result);
+ set_buffer_mapped(bh_result);
+ set_buffer_delay(bh_result);
}
- bh_result->b_bdev = iomap.iomap_target->pbr_bdev;
- set_buffer_delay(bh_result);
}
if (blocks) {
- loff_t iosize;
- iosize = (iomap.iomap_bsize - iomap.iomap_delta);
- bh_result->b_size =
- (ssize_t)min(iosize, (loff_t)(blocks << inode->i_blkbits));
+ ASSERT(iomap.iomap_bsize - iomap.iomap_delta > 0);
+ offset = min_t(xfs_off_t,
+ iomap.iomap_bsize - iomap.iomap_delta,
+ (xfs_off_t)blocks << inode->i_blkbits);
+ bh_result->b_size = (u32) min_t(xfs_off_t, UINT_MAX, offset);
}
return 0;
struct buffer_head *bh_result,
int create)
{
- return linvfs_get_block_core(inode, iblock, 0, bh_result,
+ return __linvfs_get_block(inode, iblock, 0, bh_result,
create, 0, BMAPI_WRITE);
}
-STATIC int
-linvfs_get_block_sync(
- struct inode *inode,
- sector_t iblock,
- struct buffer_head *bh_result,
- int create)
-{
- return linvfs_get_block_core(inode, iblock, 0, bh_result,
- create, 0, BMAPI_SYNC|BMAPI_WRITE);
-}
-
STATIC int
linvfs_get_blocks_direct(
struct inode *inode,
struct buffer_head *bh_result,
int create)
{
- return linvfs_get_block_core(inode, iblock, max_blocks, bh_result,
+ return __linvfs_get_block(inode, iblock, max_blocks, bh_result,
create, 1, BMAPI_WRITE|BMAPI_DIRECT);
}
+STATIC void
+linvfs_end_io_direct(
+ struct kiocb *iocb,
+ loff_t offset,
+ ssize_t size,
+ void *private)
+{
+ xfs_ioend_t *ioend = iocb->private;
+
+ /*
+ * Non-NULL private data means we need to issue a transaction to
+ * convert a range from unwritten to written extents. This needs
+ * to happen from process contect but aio+dio I/O completion
+ * happens from irq context so we need to defer it to a workqueue.
+ * This is not nessecary for synchronous direct I/O, but we do
+ * it anyway to keep the code uniform and simpler.
+ *
+ * The core direct I/O code might be changed to always call the
+ * completion handler in the future, in which case all this can
+ * go away.
+ */
+ if (private && size > 0) {
+ ioend->io_offset = offset;
+ ioend->io_size = size;
+ xfs_finish_ioend(ioend);
+ } else {
+ ASSERT(size >= 0);
+ xfs_destroy_ioend(ioend);
+ }
+
+ /*
+ * blockdev_direct_IO can return an error even afer the I/O
+ * completion handler was called. Thus we need to protect
+ * against double-freeing.
+ */
+ iocb->private = NULL;
+}
+
STATIC ssize_t
linvfs_direct_IO(
int rw,
xfs_iomap_t iomap;
int maps = 1;
int error;
+ ssize_t ret;
VOP_BMAP(vp, offset, 0, BMAPI_DEVICE, &iomap, &maps, error);
if (error)
return -error;
- return blockdev_direct_IO_no_locking(rw, iocb, inode,
- iomap.iomap_target->pbr_bdev,
+ iocb->private = xfs_alloc_ioend(inode, IOMAP_UNWRITTEN);
+
+ ret = blockdev_direct_IO_own_locking(rw, iocb, inode,
+ iomap.iomap_target->bt_bdev,
iov, offset, nr_segs,
linvfs_get_blocks_direct,
- linvfs_unwritten_convert_direct);
+ linvfs_end_io_direct);
+
+ if (unlikely(ret <= 0 && iocb->private))
+ xfs_destroy_ioend(iocb->private);
+ return ret;
}
return 0;
out_fail:
- set_page_dirty(page);
+ redirty_page_for_writepage(wbc, page);
unlock_page(page);
return 0;
out_unlock:
return error;
}
+STATIC int
+linvfs_invalidate_page(
+ struct page *page,
+ unsigned long offset)
+{
+ xfs_page_trace(XFS_INVALIDPAGE_ENTER,
+ page->mapping->host, page, offset);
+ 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
STATIC int
linvfs_release_page(
struct page *page,
- int gfp_mask)
+ gfp_t gfp_mask)
{
struct inode *inode = page->mapping->host;
int dirty, delalloc, unmapped, unwritten;
unsigned int from,
unsigned int to)
{
- if (file && (file->f_flags & O_SYNC)) {
- return block_prepare_write(page, from, to,
- linvfs_get_block_sync);
- } else {
- return block_prepare_write(page, from, to,
- linvfs_get_block);
- }
+ return block_prepare_write(page, from, to, linvfs_get_block);
}
struct address_space_operations linvfs_aops = {
.writepage = linvfs_writepage,
.sync_page = block_sync_page,
.releasepage = linvfs_release_page,
+ .invalidatepage = linvfs_invalidate_page,
.prepare_write = linvfs_prepare_write,
.commit_write = generic_commit_write,
.bmap = linvfs_bmap,
.direct_IO = linvfs_direct_IO,
+ .migratepage = buffer_migrate_page,
};
git://git.onelab.eu / linux-2.6.git / blobdiff