2 * Copyright (c) 2000-2004 Silicon Graphics, Inc. All Rights Reserved.
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms of version 2 of the GNU General Public License as
6 * published by the Free Software Foundation.
8 * This program is distributed in the hope that it would be useful, but
9 * WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
12 * Further, this software is distributed without any warranty that it is
13 * free of the rightful claim of any third person regarding infringement
14 * or the like. Any license provided herein, whether implied or
15 * otherwise, applies only to this software file. Patent licenses, if
16 * any, provided herein do not apply to combinations of this program with
17 * other software, or any other product whatsoever.
19 * You should have received a copy of the GNU General Public License along
20 * with this program; if not, write the Free Software Foundation, Inc., 59
21 * Temple Place - Suite 330, Boston MA 02111-1307, USA.
23 * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
24 * Mountain View, CA 94043, or:
28 * For further information regarding this notice, see:
30 * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
39 #include "xfs_trans.h"
40 #include "xfs_dmapi.h"
41 #include "xfs_mount.h"
42 #include "xfs_bmap_btree.h"
43 #include "xfs_alloc_btree.h"
44 #include "xfs_ialloc_btree.h"
45 #include "xfs_alloc.h"
46 #include "xfs_btree.h"
47 #include "xfs_attr_sf.h"
48 #include "xfs_dir_sf.h"
49 #include "xfs_dir2_sf.h"
50 #include "xfs_dinode.h"
51 #include "xfs_inode.h"
52 #include "xfs_error.h"
54 #include "xfs_iomap.h"
55 #include <linux/mpage.h>
57 STATIC void xfs_count_page_state(struct page *, int *, int *, int *);
58 STATIC void xfs_convert_page(struct inode *, struct page *,
59 xfs_iomap_t *, void *, int, int);
61 #if defined(XFS_RW_TRACE)
71 vnode_t *vp = LINVFS_GET_VP(inode);
72 loff_t isize = i_size_read(inode);
73 loff_t offset = page->index << PAGE_CACHE_SHIFT;
74 int delalloc = -1, unmapped = -1, unwritten = -1;
76 if (page_has_buffers(page))
77 xfs_count_page_state(page, &delalloc, &unmapped, &unwritten);
79 bdp = vn_bhv_lookup(VN_BHV_HEAD(vp), &xfs_vnodeops);
84 ktrace_enter(ip->i_rwtrace,
85 (void *)((unsigned long)tag),
89 (void *)((unsigned long)mask),
90 (void *)((unsigned long)((ip->i_d.di_size >> 32) & 0xffffffff)),
91 (void *)((unsigned long)(ip->i_d.di_size & 0xffffffff)),
92 (void *)((unsigned long)((isize >> 32) & 0xffffffff)),
93 (void *)((unsigned long)(isize & 0xffffffff)),
94 (void *)((unsigned long)((offset >> 32) & 0xffffffff)),
95 (void *)((unsigned long)(offset & 0xffffffff)),
96 (void *)((unsigned long)delalloc),
97 (void *)((unsigned long)unmapped),
98 (void *)((unsigned long)unwritten),
103 #define xfs_page_trace(tag, inode, page, mask)
107 linvfs_unwritten_done(
108 struct buffer_head *bh,
111 xfs_buf_t *pb = (xfs_buf_t *)bh->b_private;
113 ASSERT(buffer_unwritten(bh));
115 clear_buffer_unwritten(bh);
117 pagebuf_ioerror(pb, EIO);
118 if (atomic_dec_and_test(&pb->pb_io_remaining) == 1) {
119 pagebuf_iodone(pb, 1, 1);
121 end_buffer_async_write(bh, uptodate);
125 * Issue transactions to convert a buffer range from unwritten
126 * to written extents (buffered IO).
129 linvfs_unwritten_convert(
132 vnode_t *vp = XFS_BUF_FSPRIVATE(bp, vnode_t *);
135 BUG_ON(atomic_read(&bp->pb_hold) < 1);
136 VOP_BMAP(vp, XFS_BUF_OFFSET(bp), XFS_BUF_SIZE(bp),
137 BMAPI_UNWRITTEN, NULL, NULL, error);
138 XFS_BUF_SET_FSPRIVATE(bp, NULL);
139 XFS_BUF_CLR_IODONE_FUNC(bp);
140 XFS_BUF_UNDATAIO(bp);
141 iput(LINVFS_GET_IP(vp));
142 pagebuf_iodone(bp, 0, 0);
146 * Issue transactions to convert a buffer range from unwritten
147 * to written extents (direct IO).
150 linvfs_unwritten_convert_direct(
156 ASSERT(!private || inode == (struct inode *)private);
158 /* private indicates an unwritten extent lay beneath this IO,
159 * see linvfs_get_block_core.
161 if (private && size > 0) {
162 vnode_t *vp = LINVFS_GET_VP(inode);
165 VOP_BMAP(vp, offset, size, BMAPI_UNWRITTEN, NULL, NULL, error);
177 vnode_t *vp = LINVFS_GET_VP(inode);
178 int error, niomaps = 1;
180 if (((flags & (BMAPI_DIRECT|BMAPI_SYNC)) == BMAPI_DIRECT) &&
181 (offset >= i_size_read(inode)))
182 count = max_t(ssize_t, count, XFS_WRITE_IO_LOG);
184 VOP_BMAP(vp, offset, count, flags, iomapp, &niomaps, error);
185 if ((error == EAGAIN) || (error == EIO))
187 if (unlikely((flags & (BMAPI_WRITE|BMAPI_DIRECT)) ==
188 (BMAPI_WRITE|BMAPI_DIRECT) && niomaps &&
189 (iomapp->iomap_flags & IOMAP_DELAY))) {
190 flags = BMAPI_ALLOCATE;
193 if (flags & (BMAPI_WRITE|BMAPI_ALLOCATE)) {
200 * Finds the corresponding mapping in block @map array of the
201 * given @offset within a @page.
207 unsigned long offset)
209 loff_t full_offset; /* offset from start of file */
211 ASSERT(offset < PAGE_CACHE_SIZE);
213 full_offset = page->index; /* NB: using 64bit number */
214 full_offset <<= PAGE_CACHE_SHIFT; /* offset from file start */
215 full_offset += offset; /* offset from page start */
217 if (full_offset < iomapp->iomap_offset)
219 if (iomapp->iomap_offset + iomapp->iomap_bsize > full_offset)
227 struct buffer_head *bh,
228 unsigned long offset,
236 ASSERT(!(iomapp->iomap_flags & IOMAP_HOLE));
237 ASSERT(!(iomapp->iomap_flags & IOMAP_DELAY));
238 ASSERT(iomapp->iomap_bn != IOMAP_DADDR_NULL);
241 delta <<= PAGE_CACHE_SHIFT;
243 delta -= iomapp->iomap_offset;
244 delta >>= block_bits;
246 sector_shift = block_bits - BBSHIFT;
247 bn = iomapp->iomap_bn >> sector_shift;
249 ASSERT((bn << sector_shift) >= iomapp->iomap_bn);
253 bh->b_bdev = iomapp->iomap_target->pbr_bdev;
254 set_buffer_mapped(bh);
255 clear_buffer_delay(bh);
259 * Look for a page at index which is unlocked and contains our
260 * unwritten extent flagged buffers at its head. Returns page
261 * locked and with an extra reference count, and length of the
262 * unwritten extent component on this page that we can write,
263 * in units of filesystem blocks.
266 xfs_probe_unwritten_page(
267 struct address_space *mapping,
271 unsigned long max_offset,
277 page = find_trylock_page(mapping, index);
280 if (PageWriteback(page))
283 if (page->mapping && page_has_buffers(page)) {
284 struct buffer_head *bh, *head;
285 unsigned long p_offset = 0;
288 bh = head = page_buffers(page);
290 if (!buffer_unwritten(bh))
292 if (!xfs_offset_to_map(page, iomapp, p_offset))
294 if (p_offset >= max_offset)
296 xfs_map_at_offset(page, bh, p_offset, bbits, iomapp);
297 set_buffer_unwritten_io(bh);
299 p_offset += bh->b_size;
301 } while ((bh = bh->b_this_page) != head);
313 * Look for a page at index which is unlocked and not mapped
314 * yet - clustering for mmap write case.
317 xfs_probe_unmapped_page(
318 struct address_space *mapping,
320 unsigned int pg_offset)
325 page = find_trylock_page(mapping, index);
328 if (PageWriteback(page))
331 if (page->mapping && PageDirty(page)) {
332 if (page_has_buffers(page)) {
333 struct buffer_head *bh, *head;
335 bh = head = page_buffers(page);
337 if (buffer_mapped(bh) || !buffer_uptodate(bh))
340 if (ret >= pg_offset)
342 } while ((bh = bh->b_this_page) != head);
344 ret = PAGE_CACHE_SIZE;
353 xfs_probe_unmapped_cluster(
355 struct page *startpage,
356 struct buffer_head *bh,
357 struct buffer_head *head)
359 pgoff_t tindex, tlast, tloff;
360 unsigned int pg_offset, len, total = 0;
361 struct address_space *mapping = inode->i_mapping;
363 /* First sum forwards in this page */
365 if (buffer_mapped(bh))
368 } while ((bh = bh->b_this_page) != head);
370 /* If we reached the end of the page, sum forwards in
374 tlast = i_size_read(inode) >> PAGE_CACHE_SHIFT;
375 /* Prune this back to avoid pathological behavior */
376 tloff = min(tlast, startpage->index + 64);
377 for (tindex = startpage->index + 1; tindex < tloff; tindex++) {
378 len = xfs_probe_unmapped_page(mapping, tindex,
384 if (tindex == tlast &&
385 (pg_offset = i_size_read(inode) & (PAGE_CACHE_SIZE - 1))) {
386 total += xfs_probe_unmapped_page(mapping,
394 * Probe for a given page (index) in the inode and test if it is delayed
395 * and without unwritten buffers. Returns page locked and with an extra
399 xfs_probe_delalloc_page(
405 page = find_trylock_page(inode->i_mapping, index);
408 if (PageWriteback(page))
411 if (page->mapping && page_has_buffers(page)) {
412 struct buffer_head *bh, *head;
415 bh = head = page_buffers(page);
417 if (buffer_unwritten(bh)) {
420 } else if (buffer_delay(bh)) {
423 } while ((bh = bh->b_this_page) != head);
437 struct page *start_page,
438 struct buffer_head *head,
439 struct buffer_head *curr,
440 unsigned long p_offset,
446 struct buffer_head *bh = curr;
450 unsigned long nblocks = 0;
452 offset = start_page->index;
453 offset <<= PAGE_CACHE_SHIFT;
456 /* get an "empty" pagebuf to manage IO completion
457 * Proper values will be set before returning */
458 pb = pagebuf_lookup(iomapp->iomap_target, 0, 0, 0);
462 /* Take a reference to the inode to prevent it from
463 * being reclaimed while we have outstanding unwritten
466 if ((igrab(inode)) != inode) {
471 /* Set the count to 1 initially, this will stop an I/O
472 * completion callout which happens before we have started
473 * all the I/O from calling pagebuf_iodone too early.
475 atomic_set(&pb->pb_io_remaining, 1);
477 /* First map forwards in the page consecutive buffers
478 * covering this unwritten extent
481 if (!buffer_unwritten(bh))
483 tmp = xfs_offset_to_map(start_page, iomapp, p_offset);
486 xfs_map_at_offset(start_page, bh, p_offset, block_bits, iomapp);
487 set_buffer_unwritten_io(bh);
489 p_offset += bh->b_size;
491 } while ((bh = bh->b_this_page) != head);
493 atomic_add(nblocks, &pb->pb_io_remaining);
495 /* If we reached the end of the page, map forwards in any
496 * following pages which are also covered by this extent.
499 struct address_space *mapping = inode->i_mapping;
500 pgoff_t tindex, tloff, tlast;
502 unsigned int pg_offset, bbits = inode->i_blkbits;
505 tlast = i_size_read(inode) >> PAGE_CACHE_SHIFT;
506 tloff = (iomapp->iomap_offset + iomapp->iomap_bsize) >> PAGE_CACHE_SHIFT;
507 tloff = min(tlast, tloff);
508 for (tindex = start_page->index + 1; tindex < tloff; tindex++) {
509 page = xfs_probe_unwritten_page(mapping,
511 PAGE_CACHE_SIZE, &bs, bbits);
515 atomic_add(bs, &pb->pb_io_remaining);
516 xfs_convert_page(inode, page, iomapp, pb,
518 /* stop if converting the next page might add
519 * enough blocks that the corresponding byte
520 * count won't fit in our ulong page buf length */
521 if (nblocks >= ((ULONG_MAX - PAGE_SIZE) >> block_bits))
525 if (tindex == tlast &&
526 (pg_offset = (i_size_read(inode) & (PAGE_CACHE_SIZE - 1)))) {
527 page = xfs_probe_unwritten_page(mapping,
529 pg_offset, &bs, bbits);
532 atomic_add(bs, &pb->pb_io_remaining);
533 xfs_convert_page(inode, page, iomapp, pb,
535 if (nblocks >= ((ULONG_MAX - PAGE_SIZE) >> block_bits))
542 size = nblocks; /* NB: using 64bit number here */
543 size <<= block_bits; /* convert fsb's to byte range */
547 XFS_BUF_SET_SIZE(pb, size);
548 XFS_BUF_SET_COUNT(pb, size);
549 XFS_BUF_SET_OFFSET(pb, offset);
550 XFS_BUF_SET_FSPRIVATE(pb, LINVFS_GET_VP(inode));
551 XFS_BUF_SET_IODONE_FUNC(pb, linvfs_unwritten_convert);
553 if (atomic_dec_and_test(&pb->pb_io_remaining) == 1) {
554 pagebuf_iodone(pb, 1, 1);
563 struct buffer_head *bh_arr[],
566 struct buffer_head *bh;
569 BUG_ON(PageWriteback(page));
570 set_page_writeback(page);
571 clear_page_dirty(page);
575 for (i = 0; i < cnt; i++) {
577 mark_buffer_async_write(bh);
578 if (buffer_unwritten(bh))
579 set_buffer_unwritten_io(bh);
580 set_buffer_uptodate(bh);
581 clear_buffer_dirty(bh);
584 for (i = 0; i < cnt; i++)
585 submit_bh(WRITE, bh_arr[i]);
587 end_page_writeback(page);
591 * Allocate & map buffers for page given the extent map. Write it out.
592 * except for the original page of a writepage, this is called on
593 * delalloc/unwritten pages only, for the original page it is possible
594 * that the page has no mapping at all.
605 struct buffer_head *bh_arr[MAX_BUF_PER_PAGE], *bh, *head;
606 xfs_iomap_t *mp = iomapp, *tmp;
607 unsigned long end, offset;
609 int i = 0, index = 0;
610 int bbits = inode->i_blkbits;
612 end_index = i_size_read(inode) >> PAGE_CACHE_SHIFT;
613 if (page->index < end_index) {
614 end = PAGE_CACHE_SIZE;
616 end = i_size_read(inode) & (PAGE_CACHE_SIZE-1);
618 bh = head = page_buffers(page);
621 if (!(PageUptodate(page) || buffer_uptodate(bh)))
623 if (buffer_mapped(bh) && all_bh &&
624 !buffer_unwritten(bh) && !buffer_delay(bh)) {
625 if (startio && (offset < end)) {
627 bh_arr[index++] = bh;
631 tmp = xfs_offset_to_map(page, mp, offset);
634 ASSERT(!(tmp->iomap_flags & IOMAP_HOLE));
635 ASSERT(!(tmp->iomap_flags & IOMAP_DELAY));
637 /* If this is a new unwritten extent buffer (i.e. one
638 * that we haven't passed in private data for, we must
639 * now map this buffer too.
641 if (buffer_unwritten(bh) && !bh->b_end_io) {
642 ASSERT(tmp->iomap_flags & IOMAP_UNWRITTEN);
643 xfs_map_unwritten(inode, page, head, bh,
644 offset, bbits, tmp, startio, all_bh);
645 } else if (! (buffer_unwritten(bh) && buffer_locked(bh))) {
646 xfs_map_at_offset(page, bh, offset, bbits, tmp);
647 if (buffer_unwritten(bh)) {
648 set_buffer_unwritten_io(bh);
649 bh->b_private = private;
653 if (startio && (offset < end)) {
654 bh_arr[index++] = bh;
656 set_buffer_dirty(bh);
658 mark_buffer_dirty(bh);
660 } while (i++, (bh = bh->b_this_page) != head);
663 xfs_submit_page(page, bh_arr, index);
670 * Convert & write out a cluster of pages in the same extent as defined
671 * by mp and following the start page.
684 tlast = (iomapp->iomap_offset + iomapp->iomap_bsize) >> PAGE_CACHE_SHIFT;
685 for (; tindex < tlast; tindex++) {
686 page = xfs_probe_delalloc_page(inode, tindex);
689 xfs_convert_page(inode, page, iomapp, NULL, startio, all_bh);
694 * Calling this without startio set means we are being asked to make a dirty
695 * page ready for freeing it's buffers. When called with startio set then
696 * we are coming from writepage.
698 * When called with startio set it is important that we write the WHOLE
700 * The bh->b_state's cannot know if any of the blocks or which block for
701 * that matter are dirty due to mmap writes, and therefore bh uptodate is
702 * only vaild if the page itself isn't completely uptodate. Some layers
703 * may clear the page dirty flag prior to calling write page, under the
704 * assumption the entire page will be written out; by not writing out the
705 * whole page the page can be reused before all valid dirty data is
706 * written out. Note: in the case of a page that has been dirty'd by
707 * mapwrite and but partially setup by block_prepare_write the
708 * bh->b_states's will not agree and only ones setup by BPW/BCW will have
709 * valid state, thus the whole page must be written out thing.
713 xfs_page_state_convert(
717 int unmapped) /* also implies page uptodate */
719 struct buffer_head *bh_arr[MAX_BUF_PER_PAGE], *bh, *head;
720 xfs_iomap_t *iomp, iomap;
721 unsigned long p_offset = 0;
724 unsigned long long end_offset;
725 int len, err, i, cnt = 0, uptodate = 1;
726 int flags = startio ? 0 : BMAPI_TRYLOCK;
730 /* Are we off the end of the file ? */
731 end_index = i_size_read(inode) >> PAGE_CACHE_SHIFT;
732 if (page->index >= end_index) {
733 if ((page->index >= end_index + 1) ||
734 !(i_size_read(inode) & (PAGE_CACHE_SIZE - 1))) {
740 offset = (loff_t)page->index << PAGE_CACHE_SHIFT;
741 end_offset = min_t(unsigned long long,
742 offset + PAGE_CACHE_SIZE, i_size_read(inode));
744 bh = head = page_buffers(page);
749 if (offset >= end_offset)
751 if (!buffer_uptodate(bh))
753 if (!(PageUptodate(page) || buffer_uptodate(bh)) && !startio)
757 iomp = xfs_offset_to_map(page, &iomap, p_offset);
761 * First case, map an unwritten extent and prepare for
762 * extent state conversion transaction on completion.
764 if (buffer_unwritten(bh)) {
766 err = xfs_map_blocks(inode, offset, len, &iomap,
767 BMAPI_READ|BMAPI_IGNSTATE);
771 iomp = xfs_offset_to_map(page, &iomap,
774 if (iomp && startio) {
776 err = xfs_map_unwritten(inode, page,
778 inode->i_blkbits, iomp,
788 * Second case, allocate space for a delalloc buffer.
789 * We can return EAGAIN here in the release page case.
791 } else if (buffer_delay(bh)) {
793 err = xfs_map_blocks(inode, offset, len, &iomap,
794 BMAPI_ALLOCATE | flags);
798 iomp = xfs_offset_to_map(page, &iomap,
802 xfs_map_at_offset(page, bh, p_offset,
803 inode->i_blkbits, iomp);
807 set_buffer_dirty(bh);
809 mark_buffer_dirty(bh);
813 } else if ((buffer_uptodate(bh) || PageUptodate(page)) &&
814 (unmapped || startio)) {
816 if (!buffer_mapped(bh)) {
820 * Getting here implies an unmapped buffer
821 * was found, and we are in a path where we
822 * need to write the whole page out.
825 size = xfs_probe_unmapped_cluster(
826 inode, page, bh, head);
827 err = xfs_map_blocks(inode, offset,
829 BMAPI_WRITE|BMAPI_MMAP);
833 iomp = xfs_offset_to_map(page, &iomap,
837 xfs_map_at_offset(page,
839 inode->i_blkbits, iomp);
843 set_buffer_dirty(bh);
845 mark_buffer_dirty(bh);
849 } else if (startio) {
850 if (buffer_uptodate(bh) &&
851 !test_and_set_bit(BH_Lock, &bh->b_state)) {
857 } while (offset += len, p_offset += len,
858 ((bh = bh->b_this_page) != head));
860 if (uptodate && bh == head)
861 SetPageUptodate(page);
864 xfs_submit_page(page, bh_arr, cnt);
867 xfs_cluster_write(inode, page->index + 1, iomp, startio, unmapped);
872 for (i = 0; i < cnt; i++) {
873 unlock_buffer(bh_arr[i]);
877 * If it's delalloc and we have nowhere to put it,
878 * throw it away, unless the lower layers told
881 if (err != -EAGAIN) {
883 block_invalidatepage(page, 0);
885 ClearPageUptodate(page);
891 linvfs_get_block_core(
894 unsigned long blocks,
895 struct buffer_head *bh_result,
900 vnode_t *vp = LINVFS_GET_VP(inode);
905 loff_t offset = (loff_t)iblock << inode->i_blkbits;
907 /* If we are doing writes at the end of the file,
911 size = blocks << inode->i_blkbits;
912 else if (create && (offset >= i_size_read(inode)))
913 size = 1 << XFS_WRITE_IO_LOG;
915 size = 1 << inode->i_blkbits;
917 VOP_BMAP(vp, offset, size,
918 create ? flags : BMAPI_READ, &iomap, &retpbbm, error);
925 if (iomap.iomap_bn != IOMAP_DADDR_NULL) {
929 /* For unwritten extents do not report a disk address on
930 * the read case (treat as if we're reading into a hole).
932 if (create || !(iomap.iomap_flags & IOMAP_UNWRITTEN)) {
933 delta = offset - iomap.iomap_offset;
934 delta >>= inode->i_blkbits;
936 bn = iomap.iomap_bn >> (inode->i_blkbits - BBSHIFT);
939 bh_result->b_blocknr = bn;
940 bh_result->b_bdev = iomap.iomap_target->pbr_bdev;
941 set_buffer_mapped(bh_result);
943 if (create && (iomap.iomap_flags & IOMAP_UNWRITTEN)) {
945 bh_result->b_private = inode;
946 set_buffer_unwritten(bh_result);
947 set_buffer_delay(bh_result);
951 /* If this is a realtime file, data might be on a new device */
952 bh_result->b_bdev = iomap.iomap_target->pbr_bdev;
954 /* If we previously allocated a block out beyond eof and
955 * we are now coming back to use it then we will need to
956 * flag it as new even if it has a disk address.
959 ((!buffer_mapped(bh_result) && !buffer_uptodate(bh_result)) ||
960 (offset >= i_size_read(inode)) || (iomap.iomap_flags & IOMAP_NEW))) {
961 set_buffer_new(bh_result);
964 if (iomap.iomap_flags & IOMAP_DELAY) {
965 if (unlikely(direct))
968 set_buffer_mapped(bh_result);
969 set_buffer_uptodate(bh_result);
971 bh_result->b_bdev = iomap.iomap_target->pbr_bdev;
972 set_buffer_delay(bh_result);
977 iosize = (iomap.iomap_bsize - iomap.iomap_delta);
979 (ssize_t)min(iosize, (loff_t)(blocks << inode->i_blkbits));
989 struct buffer_head *bh_result,
992 return linvfs_get_block_core(inode, iblock, 0, bh_result,
993 create, 0, BMAPI_WRITE);
997 linvfs_get_block_sync(
1000 struct buffer_head *bh_result,
1003 return linvfs_get_block_core(inode, iblock, 0, bh_result,
1004 create, 0, BMAPI_SYNC|BMAPI_WRITE);
1008 linvfs_get_blocks_direct(
1009 struct inode *inode,
1011 unsigned long max_blocks,
1012 struct buffer_head *bh_result,
1015 return linvfs_get_block_core(inode, iblock, max_blocks, bh_result,
1016 create, 1, BMAPI_WRITE|BMAPI_DIRECT);
1023 const struct iovec *iov,
1025 unsigned long nr_segs)
1027 struct file *file = iocb->ki_filp;
1028 struct inode *inode = file->f_mapping->host;
1029 vnode_t *vp = LINVFS_GET_VP(inode);
1034 VOP_BMAP(vp, offset, 0, BMAPI_DEVICE, &iomap, &maps, error);
1038 return blockdev_direct_IO_no_locking(rw, iocb, inode,
1039 iomap.iomap_target->pbr_bdev,
1040 iov, offset, nr_segs,
1041 linvfs_get_blocks_direct,
1042 linvfs_unwritten_convert_direct);
1048 struct address_space *mapping,
1051 struct inode *inode = (struct inode *)mapping->host;
1052 vnode_t *vp = LINVFS_GET_VP(inode);
1055 vn_trace_entry(vp, "linvfs_bmap", (inst_t *)__return_address);
1057 VOP_RWLOCK(vp, VRWLOCK_READ);
1058 VOP_FLUSH_PAGES(vp, (xfs_off_t)0, -1, 0, FI_REMAPF, error);
1059 VOP_RWUNLOCK(vp, VRWLOCK_READ);
1060 return generic_block_bmap(mapping, block, linvfs_get_block);
1065 struct file *unused,
1068 return mpage_readpage(page, linvfs_get_block);
1073 struct file *unused,
1074 struct address_space *mapping,
1075 struct list_head *pages,
1078 return mpage_readpages(mapping, pages, nr_pages, linvfs_get_block);
1082 xfs_count_page_state(
1088 struct buffer_head *bh, *head;
1090 *delalloc = *unmapped = *unwritten = 0;
1092 bh = head = page_buffers(page);
1094 if (buffer_uptodate(bh) && !buffer_mapped(bh))
1096 else if (buffer_unwritten(bh) && !buffer_delay(bh))
1097 clear_buffer_unwritten(bh);
1098 else if (buffer_unwritten(bh))
1100 else if (buffer_delay(bh))
1102 } while ((bh = bh->b_this_page) != head);
1107 * writepage: Called from one of two places:
1109 * 1. we are flushing a delalloc buffer head.
1111 * 2. we are writing out a dirty page. Typically the page dirty
1112 * state is cleared before we get here. In this case is it
1113 * conceivable we have no buffer heads.
1115 * For delalloc space on the page we need to allocate space and
1116 * flush it. For unmapped buffer heads on the page we should
1117 * allocate space if the page is uptodate. For any other dirty
1118 * buffer heads on the page we should flush them.
1120 * If we detect that a transaction would be required to flush
1121 * the page, we have to check the process flags first, if we
1122 * are already in a transaction or disk I/O during allocations
1123 * is off, we need to fail the writepage and redirty the page.
1129 struct writeback_control *wbc)
1133 int delalloc, unmapped, unwritten;
1134 struct inode *inode = page->mapping->host;
1136 xfs_page_trace(XFS_WRITEPAGE_ENTER, inode, page, 0);
1139 * We need a transaction if:
1140 * 1. There are delalloc buffers on the page
1141 * 2. The page is uptodate and we have unmapped buffers
1142 * 3. The page is uptodate and we have no buffers
1143 * 4. There are unwritten buffers on the page
1146 if (!page_has_buffers(page)) {
1150 xfs_count_page_state(page, &delalloc, &unmapped, &unwritten);
1151 if (!PageUptodate(page))
1153 need_trans = delalloc + unmapped + unwritten;
1157 * If we need a transaction and the process flags say
1158 * we are already in a transaction, or no IO is allowed
1159 * then mark the page dirty again and leave the page
1162 if (PFLAGS_TEST_FSTRANS() && need_trans)
1166 * Delay hooking up buffer heads until we have
1167 * made our go/no-go decision.
1169 if (!page_has_buffers(page))
1170 create_empty_buffers(page, 1 << inode->i_blkbits, 0);
1173 * Convert delayed allocate, unwritten or unmapped space
1174 * to real space and flush out to disk.
1176 error = xfs_page_state_convert(inode, page, 1, unmapped);
1177 if (error == -EAGAIN)
1179 if (unlikely(error < 0))
1185 set_page_dirty(page);
1194 * Called to move a page into cleanable state - and from there
1195 * to be released. Possibly the page is already clean. We always
1196 * have buffer heads in this call.
1198 * Returns 0 if the page is ok to release, 1 otherwise.
1200 * Possible scenarios are:
1202 * 1. We are being called to release a page which has been written
1203 * to via regular I/O. buffer heads will be dirty and possibly
1204 * delalloc. If no delalloc buffer heads in this case then we
1205 * can just return zero.
1207 * 2. We are called to release a page which has been written via
1208 * mmap, all we need to do is ensure there is no delalloc
1209 * state in the buffer heads, if not we can let the caller
1210 * free them and we should come back later via writepage.
1213 linvfs_release_page(
1217 struct inode *inode = page->mapping->host;
1218 int dirty, delalloc, unmapped, unwritten;
1220 xfs_page_trace(XFS_RELEASEPAGE_ENTER, inode, page, gfp_mask);
1222 xfs_count_page_state(page, &delalloc, &unmapped, &unwritten);
1223 if (!delalloc && !unwritten)
1226 if (!(gfp_mask & __GFP_FS))
1229 /* If we are already inside a transaction or the thread cannot
1230 * do I/O, we cannot release this page.
1232 if (PFLAGS_TEST_FSTRANS())
1236 * Convert delalloc space to real space, do not flush the
1237 * data out to disk, that will be done by the caller.
1238 * Never need to allocate space here - we will always
1239 * come back to writepage in that case.
1241 dirty = xfs_page_state_convert(inode, page, 0, 0);
1242 if (dirty == 0 && !unwritten)
1247 return try_to_free_buffers(page);
1251 linvfs_prepare_write(
1257 if (file && (file->f_flags & O_SYNC)) {
1258 return block_prepare_write(page, from, to,
1259 linvfs_get_block_sync);
1261 return block_prepare_write(page, from, to,
1266 struct address_space_operations linvfs_aops = {
1267 .readpage = linvfs_readpage,
1268 .readpages = linvfs_readpages,
1269 .writepage = linvfs_writepage,
1270 .sync_page = block_sync_page,
1271 .releasepage = linvfs_release_page,
1272 .prepare_write = linvfs_prepare_write,
1273 .commit_write = generic_commit_write,
1274 .bmap = linvfs_bmap,
1275 .direct_IO = linvfs_direct_IO,