1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /* -*- mode: c; c-basic-offset: 8; -*-
3 * vim: noexpandtab sw=8 ts=8 sts=0:
5 * Copyright (C) 2002, 2004 Oracle. All rights reserved.
9 #include <linux/slab.h>
10 #include <linux/highmem.h>
11 #include <linux/pagemap.h>
12 #include <asm/byteorder.h>
13 #include <linux/swap.h>
14 #include <linux/mpage.h>
15 #include <linux/quotaops.h>
16 #include <linux/blkdev.h>
17 #include <linux/uio.h>
20 #include <cluster/masklog.h>
27 #include "extent_map.h"
34 #include "refcounttree.h"
35 #include "ocfs2_trace.h"
37 #include "buffer_head_io.h"
42 static int ocfs2_symlink_get_block(struct inode *inode, sector_t iblock,
43 struct buffer_head *bh_result, int create)
47 struct ocfs2_dinode *fe = NULL;
48 struct buffer_head *bh = NULL;
49 struct buffer_head *buffer_cache_bh = NULL;
50 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
53 trace_ocfs2_symlink_get_block(
54 (unsigned long long)OCFS2_I(inode)->ip_blkno,
55 (unsigned long long)iblock, bh_result, create);
57 BUG_ON(ocfs2_inode_is_fast_symlink(inode));
59 if ((iblock << inode->i_sb->s_blocksize_bits) > PATH_MAX + 1) {
60 mlog(ML_ERROR, "block offset > PATH_MAX: %llu",
61 (unsigned long long)iblock);
65 status = ocfs2_read_inode_block(inode, &bh);
70 fe = (struct ocfs2_dinode *) bh->b_data;
72 if ((u64)iblock >= ocfs2_clusters_to_blocks(inode->i_sb,
73 le32_to_cpu(fe->i_clusters))) {
75 mlog(ML_ERROR, "block offset is outside the allocated size: "
76 "%llu\n", (unsigned long long)iblock);
80 /* We don't use the page cache to create symlink data, so if
81 * need be, copy it over from the buffer cache. */
82 if (!buffer_uptodate(bh_result) && ocfs2_inode_is_new(inode)) {
83 u64 blkno = le64_to_cpu(fe->id2.i_list.l_recs[0].e_blkno) +
85 buffer_cache_bh = sb_getblk(osb->sb, blkno);
86 if (!buffer_cache_bh) {
88 mlog(ML_ERROR, "couldn't getblock for symlink!\n");
92 /* we haven't locked out transactions, so a commit
93 * could've happened. Since we've got a reference on
94 * the bh, even if it commits while we're doing the
95 * copy, the data is still good. */
96 if (buffer_jbd(buffer_cache_bh)
97 && ocfs2_inode_is_new(inode)) {
98 kaddr = kmap_atomic(bh_result->b_page);
100 mlog(ML_ERROR, "couldn't kmap!\n");
103 memcpy(kaddr + (bh_result->b_size * iblock),
104 buffer_cache_bh->b_data,
106 kunmap_atomic(kaddr);
107 set_buffer_uptodate(bh_result);
109 brelse(buffer_cache_bh);
112 map_bh(bh_result, inode->i_sb,
113 le64_to_cpu(fe->id2.i_list.l_recs[0].e_blkno) + iblock);
123 static int ocfs2_lock_get_block(struct inode *inode, sector_t iblock,
124 struct buffer_head *bh_result, int create)
127 struct ocfs2_inode_info *oi = OCFS2_I(inode);
129 down_read(&oi->ip_alloc_sem);
130 ret = ocfs2_get_block(inode, iblock, bh_result, create);
131 up_read(&oi->ip_alloc_sem);
136 int ocfs2_get_block(struct inode *inode, sector_t iblock,
137 struct buffer_head *bh_result, int create)
140 unsigned int ext_flags;
141 u64 max_blocks = bh_result->b_size >> inode->i_blkbits;
142 u64 p_blkno, count, past_eof;
143 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
145 trace_ocfs2_get_block((unsigned long long)OCFS2_I(inode)->ip_blkno,
146 (unsigned long long)iblock, bh_result, create);
148 if (OCFS2_I(inode)->ip_flags & OCFS2_INODE_SYSTEM_FILE)
149 mlog(ML_NOTICE, "get_block on system inode 0x%p (%lu)\n",
150 inode, inode->i_ino);
152 if (S_ISLNK(inode->i_mode)) {
153 /* this always does I/O for some reason. */
154 err = ocfs2_symlink_get_block(inode, iblock, bh_result, create);
158 err = ocfs2_extent_map_get_blocks(inode, iblock, &p_blkno, &count,
161 mlog(ML_ERROR, "Error %d from get_blocks(0x%p, %llu, 1, "
162 "%llu, NULL)\n", err, inode, (unsigned long long)iblock,
163 (unsigned long long)p_blkno);
167 if (max_blocks < count)
171 * ocfs2 never allocates in this function - the only time we
172 * need to use BH_New is when we're extending i_size on a file
173 * system which doesn't support holes, in which case BH_New
174 * allows __block_write_begin() to zero.
176 * If we see this on a sparse file system, then a truncate has
177 * raced us and removed the cluster. In this case, we clear
178 * the buffers dirty and uptodate bits and let the buffer code
179 * ignore it as a hole.
181 if (create && p_blkno == 0 && ocfs2_sparse_alloc(osb)) {
182 clear_buffer_dirty(bh_result);
183 clear_buffer_uptodate(bh_result);
187 /* Treat the unwritten extent as a hole for zeroing purposes. */
188 if (p_blkno && !(ext_flags & OCFS2_EXT_UNWRITTEN))
189 map_bh(bh_result, inode->i_sb, p_blkno);
191 bh_result->b_size = count << inode->i_blkbits;
193 if (!ocfs2_sparse_alloc(osb)) {
197 "iblock = %llu p_blkno = %llu blkno=(%llu)\n",
198 (unsigned long long)iblock,
199 (unsigned long long)p_blkno,
200 (unsigned long long)OCFS2_I(inode)->ip_blkno);
201 mlog(ML_ERROR, "Size %llu, clusters %u\n", (unsigned long long)i_size_read(inode), OCFS2_I(inode)->ip_clusters);
207 past_eof = ocfs2_blocks_for_bytes(inode->i_sb, i_size_read(inode));
209 trace_ocfs2_get_block_end((unsigned long long)OCFS2_I(inode)->ip_blkno,
210 (unsigned long long)past_eof);
211 if (create && (iblock >= past_eof))
212 set_buffer_new(bh_result);
221 int ocfs2_read_inline_data(struct inode *inode, struct page *page,
222 struct buffer_head *di_bh)
226 struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
228 if (!(le16_to_cpu(di->i_dyn_features) & OCFS2_INLINE_DATA_FL)) {
229 ocfs2_error(inode->i_sb, "Inode %llu lost inline data flag\n",
230 (unsigned long long)OCFS2_I(inode)->ip_blkno);
234 size = i_size_read(inode);
236 if (size > PAGE_SIZE ||
237 size > ocfs2_max_inline_data_with_xattr(inode->i_sb, di)) {
238 ocfs2_error(inode->i_sb,
239 "Inode %llu has with inline data has bad size: %Lu\n",
240 (unsigned long long)OCFS2_I(inode)->ip_blkno,
241 (unsigned long long)size);
245 kaddr = kmap_atomic(page);
247 memcpy(kaddr, di->id2.i_data.id_data, size);
248 /* Clear the remaining part of the page */
249 memset(kaddr + size, 0, PAGE_SIZE - size);
250 flush_dcache_page(page);
251 kunmap_atomic(kaddr);
253 SetPageUptodate(page);
258 static int ocfs2_readpage_inline(struct inode *inode, struct page *page)
261 struct buffer_head *di_bh = NULL;
263 BUG_ON(!PageLocked(page));
264 BUG_ON(!(OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL));
266 ret = ocfs2_read_inode_block(inode, &di_bh);
272 ret = ocfs2_read_inline_data(inode, page, di_bh);
280 static int ocfs2_readpage(struct file *file, struct page *page)
282 struct inode *inode = page->mapping->host;
283 struct ocfs2_inode_info *oi = OCFS2_I(inode);
284 loff_t start = (loff_t)page->index << PAGE_SHIFT;
287 trace_ocfs2_readpage((unsigned long long)oi->ip_blkno,
288 (page ? page->index : 0));
290 ret = ocfs2_inode_lock_with_page(inode, NULL, 0, page);
292 if (ret == AOP_TRUNCATED_PAGE)
298 if (down_read_trylock(&oi->ip_alloc_sem) == 0) {
300 * Unlock the page and cycle ip_alloc_sem so that we don't
301 * busyloop waiting for ip_alloc_sem to unlock
303 ret = AOP_TRUNCATED_PAGE;
306 down_read(&oi->ip_alloc_sem);
307 up_read(&oi->ip_alloc_sem);
308 goto out_inode_unlock;
312 * i_size might have just been updated as we grabed the meta lock. We
313 * might now be discovering a truncate that hit on another node.
314 * block_read_full_page->get_block freaks out if it is asked to read
315 * beyond the end of a file, so we check here. Callers
316 * (generic_file_read, vm_ops->fault) are clever enough to check i_size
317 * and notice that the page they just read isn't needed.
319 * XXX sys_readahead() seems to get that wrong?
321 if (start >= i_size_read(inode)) {
322 zero_user(page, 0, PAGE_SIZE);
323 SetPageUptodate(page);
328 if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL)
329 ret = ocfs2_readpage_inline(inode, page);
331 ret = block_read_full_page(page, ocfs2_get_block);
335 up_read(&oi->ip_alloc_sem);
337 ocfs2_inode_unlock(inode, 0);
345 * This is used only for read-ahead. Failures or difficult to handle
346 * situations are safe to ignore.
348 * Right now, we don't bother with BH_Boundary - in-inode extent lists
349 * are quite large (243 extents on 4k blocks), so most inodes don't
350 * grow out to a tree. If need be, detecting boundary extents could
351 * trivially be added in a future version of ocfs2_get_block().
353 static void ocfs2_readahead(struct readahead_control *rac)
356 struct inode *inode = rac->mapping->host;
357 struct ocfs2_inode_info *oi = OCFS2_I(inode);
360 * Use the nonblocking flag for the dlm code to avoid page
361 * lock inversion, but don't bother with retrying.
363 ret = ocfs2_inode_lock_full(inode, NULL, 0, OCFS2_LOCK_NONBLOCK);
367 if (down_read_trylock(&oi->ip_alloc_sem) == 0)
371 * Don't bother with inline-data. There isn't anything
372 * to read-ahead in that case anyway...
374 if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL)
378 * Check whether a remote node truncated this file - we just
379 * drop out in that case as it's not worth handling here.
381 if (readahead_pos(rac) >= i_size_read(inode))
384 mpage_readahead(rac, ocfs2_get_block);
387 up_read(&oi->ip_alloc_sem);
389 ocfs2_inode_unlock(inode, 0);
392 /* Note: Because we don't support holes, our allocation has
393 * already happened (allocation writes zeros to the file data)
394 * so we don't have to worry about ordered writes in
397 * ->writepage is called during the process of invalidating the page cache
398 * during blocked lock processing. It can't block on any cluster locks
399 * to during block mapping. It's relying on the fact that the block
400 * mapping can't have disappeared under the dirty pages that it is
401 * being asked to write back.
403 static int ocfs2_writepage(struct page *page, struct writeback_control *wbc)
405 trace_ocfs2_writepage(
406 (unsigned long long)OCFS2_I(page->mapping->host)->ip_blkno,
409 return block_write_full_page(page, ocfs2_get_block, wbc);
412 /* Taken from ext3. We don't necessarily need the full blown
413 * functionality yet, but IMHO it's better to cut and paste the whole
414 * thing so we can avoid introducing our own bugs (and easily pick up
415 * their fixes when they happen) --Mark */
416 int walk_page_buffers( handle_t *handle,
417 struct buffer_head *head,
421 int (*fn)( handle_t *handle,
422 struct buffer_head *bh))
424 struct buffer_head *bh;
425 unsigned block_start, block_end;
426 unsigned blocksize = head->b_size;
428 struct buffer_head *next;
430 for ( bh = head, block_start = 0;
431 ret == 0 && (bh != head || !block_start);
432 block_start = block_end, bh = next)
434 next = bh->b_this_page;
435 block_end = block_start + blocksize;
436 if (block_end <= from || block_start >= to) {
437 if (partial && !buffer_uptodate(bh))
441 err = (*fn)(handle, bh);
448 static sector_t ocfs2_bmap(struct address_space *mapping, sector_t block)
453 struct inode *inode = mapping->host;
455 trace_ocfs2_bmap((unsigned long long)OCFS2_I(inode)->ip_blkno,
456 (unsigned long long)block);
459 * The swap code (ab-)uses ->bmap to get a block mapping and then
460 * bypasseѕ the file system for actual I/O. We really can't allow
461 * that on refcounted inodes, so we have to skip out here. And yes,
462 * 0 is the magic code for a bmap error..
464 if (ocfs2_is_refcount_inode(inode))
467 /* We don't need to lock journal system files, since they aren't
468 * accessed concurrently from multiple nodes.
470 if (!INODE_JOURNAL(inode)) {
471 err = ocfs2_inode_lock(inode, NULL, 0);
477 down_read(&OCFS2_I(inode)->ip_alloc_sem);
480 if (!(OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL))
481 err = ocfs2_extent_map_get_blocks(inode, block, &p_blkno, NULL,
484 if (!INODE_JOURNAL(inode)) {
485 up_read(&OCFS2_I(inode)->ip_alloc_sem);
486 ocfs2_inode_unlock(inode, 0);
490 mlog(ML_ERROR, "get_blocks() failed, block = %llu\n",
491 (unsigned long long)block);
497 status = err ? 0 : p_blkno;
502 static int ocfs2_releasepage(struct page *page, gfp_t wait)
504 if (!page_has_buffers(page))
506 return try_to_free_buffers(page);
509 static void ocfs2_figure_cluster_boundaries(struct ocfs2_super *osb,
514 unsigned int cluster_start = 0, cluster_end = PAGE_SIZE;
516 if (unlikely(PAGE_SHIFT > osb->s_clustersize_bits)) {
519 cpp = 1 << (PAGE_SHIFT - osb->s_clustersize_bits);
521 cluster_start = cpos % cpp;
522 cluster_start = cluster_start << osb->s_clustersize_bits;
524 cluster_end = cluster_start + osb->s_clustersize;
527 BUG_ON(cluster_start > PAGE_SIZE);
528 BUG_ON(cluster_end > PAGE_SIZE);
531 *start = cluster_start;
537 * 'from' and 'to' are the region in the page to avoid zeroing.
539 * If pagesize > clustersize, this function will avoid zeroing outside
540 * of the cluster boundary.
542 * from == to == 0 is code for "zero the entire cluster region"
544 static void ocfs2_clear_page_regions(struct page *page,
545 struct ocfs2_super *osb, u32 cpos,
546 unsigned from, unsigned to)
549 unsigned int cluster_start, cluster_end;
551 ocfs2_figure_cluster_boundaries(osb, cpos, &cluster_start, &cluster_end);
553 kaddr = kmap_atomic(page);
556 if (from > cluster_start)
557 memset(kaddr + cluster_start, 0, from - cluster_start);
558 if (to < cluster_end)
559 memset(kaddr + to, 0, cluster_end - to);
561 memset(kaddr + cluster_start, 0, cluster_end - cluster_start);
564 kunmap_atomic(kaddr);
568 * Nonsparse file systems fully allocate before we get to the write
569 * code. This prevents ocfs2_write() from tagging the write as an
570 * allocating one, which means ocfs2_map_page_blocks() might try to
571 * read-in the blocks at the tail of our file. Avoid reading them by
572 * testing i_size against each block offset.
574 static int ocfs2_should_read_blk(struct inode *inode, struct page *page,
575 unsigned int block_start)
577 u64 offset = page_offset(page) + block_start;
579 if (ocfs2_sparse_alloc(OCFS2_SB(inode->i_sb)))
582 if (i_size_read(inode) > offset)
589 * Some of this taken from __block_write_begin(). We already have our
590 * mapping by now though, and the entire write will be allocating or
591 * it won't, so not much need to use BH_New.
593 * This will also skip zeroing, which is handled externally.
595 int ocfs2_map_page_blocks(struct page *page, u64 *p_blkno,
596 struct inode *inode, unsigned int from,
597 unsigned int to, int new)
600 struct buffer_head *head, *bh, *wait[2], **wait_bh = wait;
601 unsigned int block_end, block_start;
602 unsigned int bsize = i_blocksize(inode);
604 if (!page_has_buffers(page))
605 create_empty_buffers(page, bsize, 0);
607 head = page_buffers(page);
608 for (bh = head, block_start = 0; bh != head || !block_start;
609 bh = bh->b_this_page, block_start += bsize) {
610 block_end = block_start + bsize;
612 clear_buffer_new(bh);
615 * Ignore blocks outside of our i/o range -
616 * they may belong to unallocated clusters.
618 if (block_start >= to || block_end <= from) {
619 if (PageUptodate(page))
620 set_buffer_uptodate(bh);
625 * For an allocating write with cluster size >= page
626 * size, we always write the entire page.
631 if (!buffer_mapped(bh)) {
632 map_bh(bh, inode->i_sb, *p_blkno);
633 clean_bdev_bh_alias(bh);
636 if (PageUptodate(page)) {
637 if (!buffer_uptodate(bh))
638 set_buffer_uptodate(bh);
639 } else if (!buffer_uptodate(bh) && !buffer_delay(bh) &&
641 ocfs2_should_read_blk(inode, page, block_start) &&
642 (block_start < from || block_end > to)) {
643 ll_rw_block(REQ_OP_READ, 0, 1, &bh);
647 *p_blkno = *p_blkno + 1;
651 * If we issued read requests - let them complete.
653 while(wait_bh > wait) {
654 wait_on_buffer(*--wait_bh);
655 if (!buffer_uptodate(*wait_bh))
659 if (ret == 0 || !new)
663 * If we get -EIO above, zero out any newly allocated blocks
664 * to avoid exposing stale data.
669 block_end = block_start + bsize;
670 if (block_end <= from)
672 if (block_start >= to)
675 zero_user(page, block_start, bh->b_size);
676 set_buffer_uptodate(bh);
677 mark_buffer_dirty(bh);
680 block_start = block_end;
681 bh = bh->b_this_page;
682 } while (bh != head);
687 #if (PAGE_SIZE >= OCFS2_MAX_CLUSTERSIZE)
688 #define OCFS2_MAX_CTXT_PAGES 1
690 #define OCFS2_MAX_CTXT_PAGES (OCFS2_MAX_CLUSTERSIZE / PAGE_SIZE)
693 #define OCFS2_MAX_CLUSTERS_PER_PAGE (PAGE_SIZE / OCFS2_MIN_CLUSTERSIZE)
695 struct ocfs2_unwritten_extent {
696 struct list_head ue_node;
697 struct list_head ue_ip_node;
703 * Describe the state of a single cluster to be written to.
705 struct ocfs2_write_cluster_desc {
709 * Give this a unique field because c_phys eventually gets
713 unsigned c_clear_unwritten;
714 unsigned c_needs_zero;
717 struct ocfs2_write_ctxt {
718 /* Logical cluster position / len of write */
722 /* First cluster allocated in a nonsparse extend */
723 u32 w_first_new_cpos;
725 /* Type of caller. Must be one of buffer, mmap, direct. */
726 ocfs2_write_type_t w_type;
728 struct ocfs2_write_cluster_desc w_desc[OCFS2_MAX_CLUSTERS_PER_PAGE];
731 * This is true if page_size > cluster_size.
733 * It triggers a set of special cases during write which might
734 * have to deal with allocating writes to partial pages.
736 unsigned int w_large_pages;
739 * Pages involved in this write.
741 * w_target_page is the page being written to by the user.
743 * w_pages is an array of pages which always contains
744 * w_target_page, and in the case of an allocating write with
745 * page_size < cluster size, it will contain zero'd and mapped
746 * pages adjacent to w_target_page which need to be written
747 * out in so that future reads from that region will get
750 unsigned int w_num_pages;
751 struct page *w_pages[OCFS2_MAX_CTXT_PAGES];
752 struct page *w_target_page;
755 * w_target_locked is used for page_mkwrite path indicating no unlocking
756 * against w_target_page in ocfs2_write_end_nolock.
758 unsigned int w_target_locked:1;
761 * ocfs2_write_end() uses this to know what the real range to
762 * write in the target should be.
764 unsigned int w_target_from;
765 unsigned int w_target_to;
768 * We could use journal_current_handle() but this is cleaner,
773 struct buffer_head *w_di_bh;
775 struct ocfs2_cached_dealloc_ctxt w_dealloc;
777 struct list_head w_unwritten_list;
778 unsigned int w_unwritten_count;
781 void ocfs2_unlock_and_free_pages(struct page **pages, int num_pages)
785 for(i = 0; i < num_pages; i++) {
787 unlock_page(pages[i]);
788 mark_page_accessed(pages[i]);
794 static void ocfs2_unlock_pages(struct ocfs2_write_ctxt *wc)
799 * w_target_locked is only set to true in the page_mkwrite() case.
800 * The intent is to allow us to lock the target page from write_begin()
801 * to write_end(). The caller must hold a ref on w_target_page.
803 if (wc->w_target_locked) {
804 BUG_ON(!wc->w_target_page);
805 for (i = 0; i < wc->w_num_pages; i++) {
806 if (wc->w_target_page == wc->w_pages[i]) {
807 wc->w_pages[i] = NULL;
811 mark_page_accessed(wc->w_target_page);
812 put_page(wc->w_target_page);
814 ocfs2_unlock_and_free_pages(wc->w_pages, wc->w_num_pages);
817 static void ocfs2_free_unwritten_list(struct inode *inode,
818 struct list_head *head)
820 struct ocfs2_inode_info *oi = OCFS2_I(inode);
821 struct ocfs2_unwritten_extent *ue = NULL, *tmp = NULL;
823 list_for_each_entry_safe(ue, tmp, head, ue_node) {
824 list_del(&ue->ue_node);
825 spin_lock(&oi->ip_lock);
826 list_del(&ue->ue_ip_node);
827 spin_unlock(&oi->ip_lock);
832 static void ocfs2_free_write_ctxt(struct inode *inode,
833 struct ocfs2_write_ctxt *wc)
835 ocfs2_free_unwritten_list(inode, &wc->w_unwritten_list);
836 ocfs2_unlock_pages(wc);
841 static int ocfs2_alloc_write_ctxt(struct ocfs2_write_ctxt **wcp,
842 struct ocfs2_super *osb, loff_t pos,
843 unsigned len, ocfs2_write_type_t type,
844 struct buffer_head *di_bh)
847 struct ocfs2_write_ctxt *wc;
849 wc = kzalloc(sizeof(struct ocfs2_write_ctxt), GFP_NOFS);
853 wc->w_cpos = pos >> osb->s_clustersize_bits;
854 wc->w_first_new_cpos = UINT_MAX;
855 cend = (pos + len - 1) >> osb->s_clustersize_bits;
856 wc->w_clen = cend - wc->w_cpos + 1;
861 if (unlikely(PAGE_SHIFT > osb->s_clustersize_bits))
862 wc->w_large_pages = 1;
864 wc->w_large_pages = 0;
866 ocfs2_init_dealloc_ctxt(&wc->w_dealloc);
867 INIT_LIST_HEAD(&wc->w_unwritten_list);
875 * If a page has any new buffers, zero them out here, and mark them uptodate
876 * and dirty so they'll be written out (in order to prevent uninitialised
877 * block data from leaking). And clear the new bit.
879 static void ocfs2_zero_new_buffers(struct page *page, unsigned from, unsigned to)
881 unsigned int block_start, block_end;
882 struct buffer_head *head, *bh;
884 BUG_ON(!PageLocked(page));
885 if (!page_has_buffers(page))
888 bh = head = page_buffers(page);
891 block_end = block_start + bh->b_size;
893 if (buffer_new(bh)) {
894 if (block_end > from && block_start < to) {
895 if (!PageUptodate(page)) {
898 start = max(from, block_start);
899 end = min(to, block_end);
901 zero_user_segment(page, start, end);
902 set_buffer_uptodate(bh);
905 clear_buffer_new(bh);
906 mark_buffer_dirty(bh);
910 block_start = block_end;
911 bh = bh->b_this_page;
912 } while (bh != head);
916 * Only called when we have a failure during allocating write to write
917 * zero's to the newly allocated region.
919 static void ocfs2_write_failure(struct inode *inode,
920 struct ocfs2_write_ctxt *wc,
921 loff_t user_pos, unsigned user_len)
924 unsigned from = user_pos & (PAGE_SIZE - 1),
925 to = user_pos + user_len;
926 struct page *tmppage;
928 if (wc->w_target_page)
929 ocfs2_zero_new_buffers(wc->w_target_page, from, to);
931 for(i = 0; i < wc->w_num_pages; i++) {
932 tmppage = wc->w_pages[i];
934 if (tmppage && page_has_buffers(tmppage)) {
935 if (ocfs2_should_order_data(inode))
936 ocfs2_jbd2_inode_add_write(wc->w_handle, inode,
939 block_commit_write(tmppage, from, to);
944 static int ocfs2_prepare_page_for_write(struct inode *inode, u64 *p_blkno,
945 struct ocfs2_write_ctxt *wc,
946 struct page *page, u32 cpos,
947 loff_t user_pos, unsigned user_len,
951 unsigned int map_from = 0, map_to = 0;
952 unsigned int cluster_start, cluster_end;
953 unsigned int user_data_from = 0, user_data_to = 0;
955 ocfs2_figure_cluster_boundaries(OCFS2_SB(inode->i_sb), cpos,
956 &cluster_start, &cluster_end);
958 /* treat the write as new if the a hole/lseek spanned across
961 new = new | ((i_size_read(inode) <= page_offset(page)) &&
962 (page_offset(page) <= user_pos));
964 if (page == wc->w_target_page) {
965 map_from = user_pos & (PAGE_SIZE - 1);
966 map_to = map_from + user_len;
969 ret = ocfs2_map_page_blocks(page, p_blkno, inode,
970 cluster_start, cluster_end,
973 ret = ocfs2_map_page_blocks(page, p_blkno, inode,
974 map_from, map_to, new);
980 user_data_from = map_from;
981 user_data_to = map_to;
983 map_from = cluster_start;
984 map_to = cluster_end;
988 * If we haven't allocated the new page yet, we
989 * shouldn't be writing it out without copying user
990 * data. This is likely a math error from the caller.
994 map_from = cluster_start;
995 map_to = cluster_end;
997 ret = ocfs2_map_page_blocks(page, p_blkno, inode,
998 cluster_start, cluster_end, new);
1006 * Parts of newly allocated pages need to be zero'd.
1008 * Above, we have also rewritten 'to' and 'from' - as far as
1009 * the rest of the function is concerned, the entire cluster
1010 * range inside of a page needs to be written.
1012 * We can skip this if the page is up to date - it's already
1013 * been zero'd from being read in as a hole.
1015 if (new && !PageUptodate(page))
1016 ocfs2_clear_page_regions(page, OCFS2_SB(inode->i_sb),
1017 cpos, user_data_from, user_data_to);
1019 flush_dcache_page(page);
1026 * This function will only grab one clusters worth of pages.
1028 static int ocfs2_grab_pages_for_write(struct address_space *mapping,
1029 struct ocfs2_write_ctxt *wc,
1030 u32 cpos, loff_t user_pos,
1031 unsigned user_len, int new,
1032 struct page *mmap_page)
1035 unsigned long start, target_index, end_index, index;
1036 struct inode *inode = mapping->host;
1039 target_index = user_pos >> PAGE_SHIFT;
1042 * Figure out how many pages we'll be manipulating here. For
1043 * non allocating write, we just change the one
1044 * page. Otherwise, we'll need a whole clusters worth. If we're
1045 * writing past i_size, we only need enough pages to cover the
1046 * last page of the write.
1049 wc->w_num_pages = ocfs2_pages_per_cluster(inode->i_sb);
1050 start = ocfs2_align_clusters_to_page_index(inode->i_sb, cpos);
1052 * We need the index *past* the last page we could possibly
1053 * touch. This is the page past the end of the write or
1054 * i_size, whichever is greater.
1056 last_byte = max(user_pos + user_len, i_size_read(inode));
1057 BUG_ON(last_byte < 1);
1058 end_index = ((last_byte - 1) >> PAGE_SHIFT) + 1;
1059 if ((start + wc->w_num_pages) > end_index)
1060 wc->w_num_pages = end_index - start;
1062 wc->w_num_pages = 1;
1063 start = target_index;
1065 end_index = (user_pos + user_len - 1) >> PAGE_SHIFT;
1067 for(i = 0; i < wc->w_num_pages; i++) {
1070 if (index >= target_index && index <= end_index &&
1071 wc->w_type == OCFS2_WRITE_MMAP) {
1073 * ocfs2_pagemkwrite() is a little different
1074 * and wants us to directly use the page
1077 lock_page(mmap_page);
1079 /* Exit and let the caller retry */
1080 if (mmap_page->mapping != mapping) {
1081 WARN_ON(mmap_page->mapping);
1082 unlock_page(mmap_page);
1087 get_page(mmap_page);
1088 wc->w_pages[i] = mmap_page;
1089 wc->w_target_locked = true;
1090 } else if (index >= target_index && index <= end_index &&
1091 wc->w_type == OCFS2_WRITE_DIRECT) {
1092 /* Direct write has no mapping page. */
1093 wc->w_pages[i] = NULL;
1096 wc->w_pages[i] = find_or_create_page(mapping, index,
1098 if (!wc->w_pages[i]) {
1104 wait_for_stable_page(wc->w_pages[i]);
1106 if (index == target_index)
1107 wc->w_target_page = wc->w_pages[i];
1111 wc->w_target_locked = false;
1116 * Prepare a single cluster for write one cluster into the file.
1118 static int ocfs2_write_cluster(struct address_space *mapping,
1119 u32 *phys, unsigned int new,
1120 unsigned int clear_unwritten,
1121 unsigned int should_zero,
1122 struct ocfs2_alloc_context *data_ac,
1123 struct ocfs2_alloc_context *meta_ac,
1124 struct ocfs2_write_ctxt *wc, u32 cpos,
1125 loff_t user_pos, unsigned user_len)
1129 struct inode *inode = mapping->host;
1130 struct ocfs2_extent_tree et;
1131 int bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1);
1137 * This is safe to call with the page locks - it won't take
1138 * any additional semaphores or cluster locks.
1141 ret = ocfs2_add_inode_data(OCFS2_SB(inode->i_sb), inode,
1142 &tmp_pos, 1, !clear_unwritten,
1143 wc->w_di_bh, wc->w_handle,
1144 data_ac, meta_ac, NULL);
1146 * This shouldn't happen because we must have already
1147 * calculated the correct meta data allocation required. The
1148 * internal tree allocation code should know how to increase
1149 * transaction credits itself.
1151 * If need be, we could handle -EAGAIN for a
1152 * RESTART_TRANS here.
1154 mlog_bug_on_msg(ret == -EAGAIN,
1155 "Inode %llu: EAGAIN return during allocation.\n",
1156 (unsigned long long)OCFS2_I(inode)->ip_blkno);
1161 } else if (clear_unwritten) {
1162 ocfs2_init_dinode_extent_tree(&et, INODE_CACHE(inode),
1164 ret = ocfs2_mark_extent_written(inode, &et,
1165 wc->w_handle, cpos, 1, *phys,
1166 meta_ac, &wc->w_dealloc);
1174 * The only reason this should fail is due to an inability to
1175 * find the extent added.
1177 ret = ocfs2_get_clusters(inode, cpos, phys, NULL, NULL);
1179 mlog(ML_ERROR, "Get physical blkno failed for inode %llu, "
1180 "at logical cluster %u",
1181 (unsigned long long)OCFS2_I(inode)->ip_blkno, cpos);
1187 p_blkno = ocfs2_clusters_to_blocks(inode->i_sb, *phys);
1189 p_blkno += (user_pos >> inode->i_sb->s_blocksize_bits) & (u64)(bpc - 1);
1191 for(i = 0; i < wc->w_num_pages; i++) {
1194 /* This is the direct io target page. */
1195 if (wc->w_pages[i] == NULL) {
1200 tmpret = ocfs2_prepare_page_for_write(inode, &p_blkno, wc,
1201 wc->w_pages[i], cpos,
1212 * We only have cleanup to do in case of allocating write.
1215 ocfs2_write_failure(inode, wc, user_pos, user_len);
1222 static int ocfs2_write_cluster_by_desc(struct address_space *mapping,
1223 struct ocfs2_alloc_context *data_ac,
1224 struct ocfs2_alloc_context *meta_ac,
1225 struct ocfs2_write_ctxt *wc,
1226 loff_t pos, unsigned len)
1230 unsigned int local_len = len;
1231 struct ocfs2_write_cluster_desc *desc;
1232 struct ocfs2_super *osb = OCFS2_SB(mapping->host->i_sb);
1234 for (i = 0; i < wc->w_clen; i++) {
1235 desc = &wc->w_desc[i];
1238 * We have to make sure that the total write passed in
1239 * doesn't extend past a single cluster.
1242 cluster_off = pos & (osb->s_clustersize - 1);
1243 if ((cluster_off + local_len) > osb->s_clustersize)
1244 local_len = osb->s_clustersize - cluster_off;
1246 ret = ocfs2_write_cluster(mapping, &desc->c_phys,
1248 desc->c_clear_unwritten,
1251 wc, desc->c_cpos, pos, local_len);
1267 * ocfs2_write_end() wants to know which parts of the target page it
1268 * should complete the write on. It's easiest to compute them ahead of
1269 * time when a more complete view of the write is available.
1271 static void ocfs2_set_target_boundaries(struct ocfs2_super *osb,
1272 struct ocfs2_write_ctxt *wc,
1273 loff_t pos, unsigned len, int alloc)
1275 struct ocfs2_write_cluster_desc *desc;
1277 wc->w_target_from = pos & (PAGE_SIZE - 1);
1278 wc->w_target_to = wc->w_target_from + len;
1284 * Allocating write - we may have different boundaries based
1285 * on page size and cluster size.
1287 * NOTE: We can no longer compute one value from the other as
1288 * the actual write length and user provided length may be
1292 if (wc->w_large_pages) {
1294 * We only care about the 1st and last cluster within
1295 * our range and whether they should be zero'd or not. Either
1296 * value may be extended out to the start/end of a
1297 * newly allocated cluster.
1299 desc = &wc->w_desc[0];
1300 if (desc->c_needs_zero)
1301 ocfs2_figure_cluster_boundaries(osb,
1306 desc = &wc->w_desc[wc->w_clen - 1];
1307 if (desc->c_needs_zero)
1308 ocfs2_figure_cluster_boundaries(osb,
1313 wc->w_target_from = 0;
1314 wc->w_target_to = PAGE_SIZE;
1319 * Check if this extent is marked UNWRITTEN by direct io. If so, we need not to
1320 * do the zero work. And should not to clear UNWRITTEN since it will be cleared
1321 * by the direct io procedure.
1322 * If this is a new extent that allocated by direct io, we should mark it in
1323 * the ip_unwritten_list.
1325 static int ocfs2_unwritten_check(struct inode *inode,
1326 struct ocfs2_write_ctxt *wc,
1327 struct ocfs2_write_cluster_desc *desc)
1329 struct ocfs2_inode_info *oi = OCFS2_I(inode);
1330 struct ocfs2_unwritten_extent *ue = NULL, *new = NULL;
1333 if (!desc->c_needs_zero)
1337 spin_lock(&oi->ip_lock);
1338 /* Needs not to zero no metter buffer or direct. The one who is zero
1339 * the cluster is doing zero. And he will clear unwritten after all
1340 * cluster io finished. */
1341 list_for_each_entry(ue, &oi->ip_unwritten_list, ue_ip_node) {
1342 if (desc->c_cpos == ue->ue_cpos) {
1343 BUG_ON(desc->c_new);
1344 desc->c_needs_zero = 0;
1345 desc->c_clear_unwritten = 0;
1350 if (wc->w_type != OCFS2_WRITE_DIRECT)
1354 spin_unlock(&oi->ip_lock);
1355 new = kmalloc(sizeof(struct ocfs2_unwritten_extent),
1363 /* This direct write will doing zero. */
1364 new->ue_cpos = desc->c_cpos;
1365 new->ue_phys = desc->c_phys;
1366 desc->c_clear_unwritten = 0;
1367 list_add_tail(&new->ue_ip_node, &oi->ip_unwritten_list);
1368 list_add_tail(&new->ue_node, &wc->w_unwritten_list);
1369 wc->w_unwritten_count++;
1372 spin_unlock(&oi->ip_lock);
1379 * Populate each single-cluster write descriptor in the write context
1380 * with information about the i/o to be done.
1382 * Returns the number of clusters that will have to be allocated, as
1383 * well as a worst case estimate of the number of extent records that
1384 * would have to be created during a write to an unwritten region.
1386 static int ocfs2_populate_write_desc(struct inode *inode,
1387 struct ocfs2_write_ctxt *wc,
1388 unsigned int *clusters_to_alloc,
1389 unsigned int *extents_to_split)
1392 struct ocfs2_write_cluster_desc *desc;
1393 unsigned int num_clusters = 0;
1394 unsigned int ext_flags = 0;
1398 *clusters_to_alloc = 0;
1399 *extents_to_split = 0;
1401 for (i = 0; i < wc->w_clen; i++) {
1402 desc = &wc->w_desc[i];
1403 desc->c_cpos = wc->w_cpos + i;
1405 if (num_clusters == 0) {
1407 * Need to look up the next extent record.
1409 ret = ocfs2_get_clusters(inode, desc->c_cpos, &phys,
1410 &num_clusters, &ext_flags);
1416 /* We should already CoW the refcountd extent. */
1417 BUG_ON(ext_flags & OCFS2_EXT_REFCOUNTED);
1420 * Assume worst case - that we're writing in
1421 * the middle of the extent.
1423 * We can assume that the write proceeds from
1424 * left to right, in which case the extent
1425 * insert code is smart enough to coalesce the
1426 * next splits into the previous records created.
1428 if (ext_flags & OCFS2_EXT_UNWRITTEN)
1429 *extents_to_split = *extents_to_split + 2;
1432 * Only increment phys if it doesn't describe
1439 * If w_first_new_cpos is < UINT_MAX, we have a non-sparse
1440 * file that got extended. w_first_new_cpos tells us
1441 * where the newly allocated clusters are so we can
1444 if (desc->c_cpos >= wc->w_first_new_cpos) {
1446 desc->c_needs_zero = 1;
1449 desc->c_phys = phys;
1452 desc->c_needs_zero = 1;
1453 desc->c_clear_unwritten = 1;
1454 *clusters_to_alloc = *clusters_to_alloc + 1;
1457 if (ext_flags & OCFS2_EXT_UNWRITTEN) {
1458 desc->c_clear_unwritten = 1;
1459 desc->c_needs_zero = 1;
1462 ret = ocfs2_unwritten_check(inode, wc, desc);
1476 static int ocfs2_write_begin_inline(struct address_space *mapping,
1477 struct inode *inode,
1478 struct ocfs2_write_ctxt *wc)
1481 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1484 struct ocfs2_dinode *di = (struct ocfs2_dinode *)wc->w_di_bh->b_data;
1486 handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
1487 if (IS_ERR(handle)) {
1488 ret = PTR_ERR(handle);
1493 page = find_or_create_page(mapping, 0, GFP_NOFS);
1495 ocfs2_commit_trans(osb, handle);
1501 * If we don't set w_num_pages then this page won't get unlocked
1502 * and freed on cleanup of the write context.
1504 wc->w_pages[0] = wc->w_target_page = page;
1505 wc->w_num_pages = 1;
1507 ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), wc->w_di_bh,
1508 OCFS2_JOURNAL_ACCESS_WRITE);
1510 ocfs2_commit_trans(osb, handle);
1516 if (!(OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL))
1517 ocfs2_set_inode_data_inline(inode, di);
1519 if (!PageUptodate(page)) {
1520 ret = ocfs2_read_inline_data(inode, page, wc->w_di_bh);
1522 ocfs2_commit_trans(osb, handle);
1528 wc->w_handle = handle;
1533 int ocfs2_size_fits_inline_data(struct buffer_head *di_bh, u64 new_size)
1535 struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
1537 if (new_size <= le16_to_cpu(di->id2.i_data.id_count))
1542 static int ocfs2_try_to_write_inline_data(struct address_space *mapping,
1543 struct inode *inode, loff_t pos,
1544 unsigned len, struct page *mmap_page,
1545 struct ocfs2_write_ctxt *wc)
1547 int ret, written = 0;
1548 loff_t end = pos + len;
1549 struct ocfs2_inode_info *oi = OCFS2_I(inode);
1550 struct ocfs2_dinode *di = NULL;
1552 trace_ocfs2_try_to_write_inline_data((unsigned long long)oi->ip_blkno,
1553 len, (unsigned long long)pos,
1554 oi->ip_dyn_features);
1557 * Handle inodes which already have inline data 1st.
1559 if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
1560 if (mmap_page == NULL &&
1561 ocfs2_size_fits_inline_data(wc->w_di_bh, end))
1562 goto do_inline_write;
1565 * The write won't fit - we have to give this inode an
1566 * inline extent list now.
1568 ret = ocfs2_convert_inline_data_to_extents(inode, wc->w_di_bh);
1575 * Check whether the inode can accept inline data.
1577 if (oi->ip_clusters != 0 || i_size_read(inode) != 0)
1581 * Check whether the write can fit.
1583 di = (struct ocfs2_dinode *)wc->w_di_bh->b_data;
1585 end > ocfs2_max_inline_data_with_xattr(inode->i_sb, di))
1589 ret = ocfs2_write_begin_inline(mapping, inode, wc);
1596 * This signals to the caller that the data can be written
1601 return written ? written : ret;
1605 * This function only does anything for file systems which can't
1606 * handle sparse files.
1608 * What we want to do here is fill in any hole between the current end
1609 * of allocation and the end of our write. That way the rest of the
1610 * write path can treat it as an non-allocating write, which has no
1611 * special case code for sparse/nonsparse files.
1613 static int ocfs2_expand_nonsparse_inode(struct inode *inode,
1614 struct buffer_head *di_bh,
1615 loff_t pos, unsigned len,
1616 struct ocfs2_write_ctxt *wc)
1619 loff_t newsize = pos + len;
1621 BUG_ON(ocfs2_sparse_alloc(OCFS2_SB(inode->i_sb)));
1623 if (newsize <= i_size_read(inode))
1626 ret = ocfs2_extend_no_holes(inode, di_bh, newsize, pos);
1630 /* There is no wc if this is call from direct. */
1632 wc->w_first_new_cpos =
1633 ocfs2_clusters_for_bytes(inode->i_sb, i_size_read(inode));
1638 static int ocfs2_zero_tail(struct inode *inode, struct buffer_head *di_bh,
1643 BUG_ON(!ocfs2_sparse_alloc(OCFS2_SB(inode->i_sb)));
1644 if (pos > i_size_read(inode))
1645 ret = ocfs2_zero_extend(inode, di_bh, pos);
1650 int ocfs2_write_begin_nolock(struct address_space *mapping,
1651 loff_t pos, unsigned len, ocfs2_write_type_t type,
1652 struct page **pagep, void **fsdata,
1653 struct buffer_head *di_bh, struct page *mmap_page)
1655 int ret, cluster_of_pages, credits = OCFS2_INODE_UPDATE_CREDITS;
1656 unsigned int clusters_to_alloc, extents_to_split, clusters_need = 0;
1657 struct ocfs2_write_ctxt *wc;
1658 struct inode *inode = mapping->host;
1659 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1660 struct ocfs2_dinode *di;
1661 struct ocfs2_alloc_context *data_ac = NULL;
1662 struct ocfs2_alloc_context *meta_ac = NULL;
1664 struct ocfs2_extent_tree et;
1665 int try_free = 1, ret1;
1668 ret = ocfs2_alloc_write_ctxt(&wc, osb, pos, len, type, di_bh);
1674 if (ocfs2_supports_inline_data(osb)) {
1675 ret = ocfs2_try_to_write_inline_data(mapping, inode, pos, len,
1687 /* Direct io change i_size late, should not zero tail here. */
1688 if (type != OCFS2_WRITE_DIRECT) {
1689 if (ocfs2_sparse_alloc(osb))
1690 ret = ocfs2_zero_tail(inode, di_bh, pos);
1692 ret = ocfs2_expand_nonsparse_inode(inode, di_bh, pos,
1700 ret = ocfs2_check_range_for_refcount(inode, pos, len);
1704 } else if (ret == 1) {
1705 clusters_need = wc->w_clen;
1706 ret = ocfs2_refcount_cow(inode, di_bh,
1707 wc->w_cpos, wc->w_clen, UINT_MAX);
1714 ret = ocfs2_populate_write_desc(inode, wc, &clusters_to_alloc,
1720 clusters_need += clusters_to_alloc;
1722 di = (struct ocfs2_dinode *)wc->w_di_bh->b_data;
1724 trace_ocfs2_write_begin_nolock(
1725 (unsigned long long)OCFS2_I(inode)->ip_blkno,
1726 (long long)i_size_read(inode),
1727 le32_to_cpu(di->i_clusters),
1728 pos, len, type, mmap_page,
1729 clusters_to_alloc, extents_to_split);
1732 * We set w_target_from, w_target_to here so that
1733 * ocfs2_write_end() knows which range in the target page to
1734 * write out. An allocation requires that we write the entire
1737 if (clusters_to_alloc || extents_to_split) {
1739 * XXX: We are stretching the limits of
1740 * ocfs2_lock_allocators(). It greatly over-estimates
1741 * the work to be done.
1743 ocfs2_init_dinode_extent_tree(&et, INODE_CACHE(inode),
1745 ret = ocfs2_lock_allocators(inode, &et,
1746 clusters_to_alloc, extents_to_split,
1747 &data_ac, &meta_ac);
1754 data_ac->ac_resv = &OCFS2_I(inode)->ip_la_data_resv;
1756 credits = ocfs2_calc_extend_credits(inode->i_sb,
1758 } else if (type == OCFS2_WRITE_DIRECT)
1759 /* direct write needs not to start trans if no extents alloc. */
1763 * We have to zero sparse allocated clusters, unwritten extent clusters,
1764 * and non-sparse clusters we just extended. For non-sparse writes,
1765 * we know zeros will only be needed in the first and/or last cluster.
1767 if (wc->w_clen && (wc->w_desc[0].c_needs_zero ||
1768 wc->w_desc[wc->w_clen - 1].c_needs_zero))
1769 cluster_of_pages = 1;
1771 cluster_of_pages = 0;
1773 ocfs2_set_target_boundaries(osb, wc, pos, len, cluster_of_pages);
1775 handle = ocfs2_start_trans(osb, credits);
1776 if (IS_ERR(handle)) {
1777 ret = PTR_ERR(handle);
1782 wc->w_handle = handle;
1784 if (clusters_to_alloc) {
1785 ret = dquot_alloc_space_nodirty(inode,
1786 ocfs2_clusters_to_bytes(osb->sb, clusters_to_alloc));
1791 ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), wc->w_di_bh,
1792 OCFS2_JOURNAL_ACCESS_WRITE);
1799 * Fill our page array first. That way we've grabbed enough so
1800 * that we can zero and flush if we error after adding the
1803 ret = ocfs2_grab_pages_for_write(mapping, wc, wc->w_cpos, pos, len,
1804 cluster_of_pages, mmap_page);
1805 if (ret && ret != -EAGAIN) {
1811 * ocfs2_grab_pages_for_write() returns -EAGAIN if it could not lock
1812 * the target page. In this case, we exit with no error and no target
1813 * page. This will trigger the caller, page_mkwrite(), to re-try
1816 if (ret == -EAGAIN) {
1817 BUG_ON(wc->w_target_page);
1822 ret = ocfs2_write_cluster_by_desc(mapping, data_ac, meta_ac, wc, pos,
1830 ocfs2_free_alloc_context(data_ac);
1832 ocfs2_free_alloc_context(meta_ac);
1836 *pagep = wc->w_target_page;
1840 if (clusters_to_alloc)
1841 dquot_free_space(inode,
1842 ocfs2_clusters_to_bytes(osb->sb, clusters_to_alloc));
1844 ocfs2_commit_trans(osb, handle);
1848 * The mmapped page won't be unlocked in ocfs2_free_write_ctxt(),
1849 * even in case of error here like ENOSPC and ENOMEM. So, we need
1850 * to unlock the target page manually to prevent deadlocks when
1851 * retrying again on ENOSPC, or when returning non-VM_FAULT_LOCKED
1854 if (wc->w_target_locked)
1855 unlock_page(mmap_page);
1857 ocfs2_free_write_ctxt(inode, wc);
1860 ocfs2_free_alloc_context(data_ac);
1864 ocfs2_free_alloc_context(meta_ac);
1868 if (ret == -ENOSPC && try_free) {
1870 * Try to free some truncate log so that we can have enough
1871 * clusters to allocate.
1875 ret1 = ocfs2_try_to_free_truncate_log(osb, clusters_need);
1886 static int ocfs2_write_begin(struct file *file, struct address_space *mapping,
1887 loff_t pos, unsigned len, unsigned flags,
1888 struct page **pagep, void **fsdata)
1891 struct buffer_head *di_bh = NULL;
1892 struct inode *inode = mapping->host;
1894 ret = ocfs2_inode_lock(inode, &di_bh, 1);
1901 * Take alloc sem here to prevent concurrent lookups. That way
1902 * the mapping, zeroing and tree manipulation within
1903 * ocfs2_write() will be safe against ->readpage(). This
1904 * should also serve to lock out allocation from a shared
1907 down_write(&OCFS2_I(inode)->ip_alloc_sem);
1909 ret = ocfs2_write_begin_nolock(mapping, pos, len, OCFS2_WRITE_BUFFER,
1910 pagep, fsdata, di_bh, NULL);
1921 up_write(&OCFS2_I(inode)->ip_alloc_sem);
1924 ocfs2_inode_unlock(inode, 1);
1929 static void ocfs2_write_end_inline(struct inode *inode, loff_t pos,
1930 unsigned len, unsigned *copied,
1931 struct ocfs2_dinode *di,
1932 struct ocfs2_write_ctxt *wc)
1936 if (unlikely(*copied < len)) {
1937 if (!PageUptodate(wc->w_target_page)) {
1943 kaddr = kmap_atomic(wc->w_target_page);
1944 memcpy(di->id2.i_data.id_data + pos, kaddr + pos, *copied);
1945 kunmap_atomic(kaddr);
1947 trace_ocfs2_write_end_inline(
1948 (unsigned long long)OCFS2_I(inode)->ip_blkno,
1949 (unsigned long long)pos, *copied,
1950 le16_to_cpu(di->id2.i_data.id_count),
1951 le16_to_cpu(di->i_dyn_features));
1954 int ocfs2_write_end_nolock(struct address_space *mapping,
1955 loff_t pos, unsigned len, unsigned copied, void *fsdata)
1958 unsigned from, to, start = pos & (PAGE_SIZE - 1);
1959 struct inode *inode = mapping->host;
1960 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1961 struct ocfs2_write_ctxt *wc = fsdata;
1962 struct ocfs2_dinode *di = (struct ocfs2_dinode *)wc->w_di_bh->b_data;
1963 handle_t *handle = wc->w_handle;
1964 struct page *tmppage;
1966 BUG_ON(!list_empty(&wc->w_unwritten_list));
1969 ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode),
1970 wc->w_di_bh, OCFS2_JOURNAL_ACCESS_WRITE);
1978 if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
1979 ocfs2_write_end_inline(inode, pos, len, &copied, di, wc);
1980 goto out_write_size;
1983 if (unlikely(copied < len) && wc->w_target_page) {
1984 if (!PageUptodate(wc->w_target_page))
1987 ocfs2_zero_new_buffers(wc->w_target_page, start+copied,
1990 if (wc->w_target_page)
1991 flush_dcache_page(wc->w_target_page);
1993 for(i = 0; i < wc->w_num_pages; i++) {
1994 tmppage = wc->w_pages[i];
1996 /* This is the direct io target page. */
1997 if (tmppage == NULL)
2000 if (tmppage == wc->w_target_page) {
2001 from = wc->w_target_from;
2002 to = wc->w_target_to;
2004 BUG_ON(from > PAGE_SIZE ||
2009 * Pages adjacent to the target (if any) imply
2010 * a hole-filling write in which case we want
2011 * to flush their entire range.
2017 if (page_has_buffers(tmppage)) {
2018 if (handle && ocfs2_should_order_data(inode)) {
2020 ((loff_t)tmppage->index << PAGE_SHIFT) +
2022 loff_t length = to - from;
2023 ocfs2_jbd2_inode_add_write(handle, inode,
2024 start_byte, length);
2026 block_commit_write(tmppage, from, to);
2031 /* Direct io do not update i_size here. */
2032 if (wc->w_type != OCFS2_WRITE_DIRECT) {
2034 if (pos > i_size_read(inode)) {
2035 i_size_write(inode, pos);
2036 mark_inode_dirty(inode);
2038 inode->i_blocks = ocfs2_inode_sector_count(inode);
2039 di->i_size = cpu_to_le64((u64)i_size_read(inode));
2040 inode->i_mtime = inode->i_ctime = current_time(inode);
2041 di->i_mtime = di->i_ctime = cpu_to_le64(inode->i_mtime.tv_sec);
2042 di->i_mtime_nsec = di->i_ctime_nsec = cpu_to_le32(inode->i_mtime.tv_nsec);
2044 ocfs2_update_inode_fsync_trans(handle, inode, 1);
2047 ocfs2_journal_dirty(handle, wc->w_di_bh);
2050 /* unlock pages before dealloc since it needs acquiring j_trans_barrier
2051 * lock, or it will cause a deadlock since journal commit threads holds
2052 * this lock and will ask for the page lock when flushing the data.
2053 * put it here to preserve the unlock order.
2055 ocfs2_unlock_pages(wc);
2058 ocfs2_commit_trans(osb, handle);
2060 ocfs2_run_deallocs(osb, &wc->w_dealloc);
2062 brelse(wc->w_di_bh);
2068 static int ocfs2_write_end(struct file *file, struct address_space *mapping,
2069 loff_t pos, unsigned len, unsigned copied,
2070 struct page *page, void *fsdata)
2073 struct inode *inode = mapping->host;
2075 ret = ocfs2_write_end_nolock(mapping, pos, len, copied, fsdata);
2077 up_write(&OCFS2_I(inode)->ip_alloc_sem);
2078 ocfs2_inode_unlock(inode, 1);
2083 struct ocfs2_dio_write_ctxt {
2084 struct list_head dw_zero_list;
2085 unsigned dw_zero_count;
2087 pid_t dw_writer_pid;
2090 static struct ocfs2_dio_write_ctxt *
2091 ocfs2_dio_alloc_write_ctx(struct buffer_head *bh, int *alloc)
2093 struct ocfs2_dio_write_ctxt *dwc = NULL;
2096 return bh->b_private;
2098 dwc = kmalloc(sizeof(struct ocfs2_dio_write_ctxt), GFP_NOFS);
2101 INIT_LIST_HEAD(&dwc->dw_zero_list);
2102 dwc->dw_zero_count = 0;
2103 dwc->dw_orphaned = 0;
2104 dwc->dw_writer_pid = task_pid_nr(current);
2105 bh->b_private = dwc;
2111 static void ocfs2_dio_free_write_ctx(struct inode *inode,
2112 struct ocfs2_dio_write_ctxt *dwc)
2114 ocfs2_free_unwritten_list(inode, &dwc->dw_zero_list);
2119 * TODO: Make this into a generic get_blocks function.
2121 * From do_direct_io in direct-io.c:
2122 * "So what we do is to permit the ->get_blocks function to populate
2123 * bh.b_size with the size of IO which is permitted at this offset and
2126 * This function is called directly from get_more_blocks in direct-io.c.
2128 * called like this: dio->get_blocks(dio->inode, fs_startblk,
2129 * fs_count, map_bh, dio->rw == WRITE);
2131 static int ocfs2_dio_wr_get_block(struct inode *inode, sector_t iblock,
2132 struct buffer_head *bh_result, int create)
2134 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2135 struct ocfs2_inode_info *oi = OCFS2_I(inode);
2136 struct ocfs2_write_ctxt *wc;
2137 struct ocfs2_write_cluster_desc *desc = NULL;
2138 struct ocfs2_dio_write_ctxt *dwc = NULL;
2139 struct buffer_head *di_bh = NULL;
2141 unsigned int i_blkbits = inode->i_sb->s_blocksize_bits;
2142 loff_t pos = iblock << i_blkbits;
2143 sector_t endblk = (i_size_read(inode) - 1) >> i_blkbits;
2144 unsigned len, total_len = bh_result->b_size;
2145 int ret = 0, first_get_block = 0;
2147 len = osb->s_clustersize - (pos & (osb->s_clustersize - 1));
2148 len = min(total_len, len);
2151 * bh_result->b_size is count in get_more_blocks according to write
2152 * "pos" and "end", we need map twice to return different buffer state:
2153 * 1. area in file size, not set NEW;
2154 * 2. area out file size, set NEW.
2157 * |--------|---------|---------|---------
2158 * |<-------area in file------->|
2161 if ((iblock <= endblk) &&
2162 ((iblock + ((len - 1) >> i_blkbits)) > endblk))
2163 len = (endblk - iblock + 1) << i_blkbits;
2165 mlog(0, "get block of %lu at %llu:%u req %u\n",
2166 inode->i_ino, pos, len, total_len);
2169 * Because we need to change file size in ocfs2_dio_end_io_write(), or
2170 * we may need to add it to orphan dir. So can not fall to fast path
2171 * while file size will be changed.
2173 if (pos + total_len <= i_size_read(inode)) {
2175 /* This is the fast path for re-write. */
2176 ret = ocfs2_lock_get_block(inode, iblock, bh_result, create);
2177 if (buffer_mapped(bh_result) &&
2178 !buffer_new(bh_result) &&
2182 /* Clear state set by ocfs2_get_block. */
2183 bh_result->b_state = 0;
2186 dwc = ocfs2_dio_alloc_write_ctx(bh_result, &first_get_block);
2187 if (unlikely(dwc == NULL)) {
2193 if (ocfs2_clusters_for_bytes(inode->i_sb, pos + total_len) >
2194 ocfs2_clusters_for_bytes(inode->i_sb, i_size_read(inode)) &&
2195 !dwc->dw_orphaned) {
2197 * when we are going to alloc extents beyond file size, add the
2198 * inode to orphan dir, so we can recall those spaces when
2199 * system crashed during write.
2201 ret = ocfs2_add_inode_to_orphan(osb, inode);
2206 dwc->dw_orphaned = 1;
2209 ret = ocfs2_inode_lock(inode, &di_bh, 1);
2215 down_write(&oi->ip_alloc_sem);
2217 if (first_get_block) {
2218 if (ocfs2_sparse_alloc(osb))
2219 ret = ocfs2_zero_tail(inode, di_bh, pos);
2221 ret = ocfs2_expand_nonsparse_inode(inode, di_bh, pos,
2229 ret = ocfs2_write_begin_nolock(inode->i_mapping, pos, len,
2230 OCFS2_WRITE_DIRECT, NULL,
2231 (void **)&wc, di_bh, NULL);
2237 desc = &wc->w_desc[0];
2239 p_blkno = ocfs2_clusters_to_blocks(inode->i_sb, desc->c_phys);
2240 BUG_ON(p_blkno == 0);
2241 p_blkno += iblock & (u64)(ocfs2_clusters_to_blocks(inode->i_sb, 1) - 1);
2243 map_bh(bh_result, inode->i_sb, p_blkno);
2244 bh_result->b_size = len;
2245 if (desc->c_needs_zero)
2246 set_buffer_new(bh_result);
2248 if (iblock > endblk)
2249 set_buffer_new(bh_result);
2251 /* May sleep in end_io. It should not happen in a irq context. So defer
2252 * it to dio work queue. */
2253 set_buffer_defer_completion(bh_result);
2255 if (!list_empty(&wc->w_unwritten_list)) {
2256 struct ocfs2_unwritten_extent *ue = NULL;
2258 ue = list_first_entry(&wc->w_unwritten_list,
2259 struct ocfs2_unwritten_extent,
2261 BUG_ON(ue->ue_cpos != desc->c_cpos);
2262 /* The physical address may be 0, fill it. */
2263 ue->ue_phys = desc->c_phys;
2265 list_splice_tail_init(&wc->w_unwritten_list, &dwc->dw_zero_list);
2266 dwc->dw_zero_count += wc->w_unwritten_count;
2269 ret = ocfs2_write_end_nolock(inode->i_mapping, pos, len, len, wc);
2273 up_write(&oi->ip_alloc_sem);
2274 ocfs2_inode_unlock(inode, 1);
2282 static int ocfs2_dio_end_io_write(struct inode *inode,
2283 struct ocfs2_dio_write_ctxt *dwc,
2287 struct ocfs2_cached_dealloc_ctxt dealloc;
2288 struct ocfs2_extent_tree et;
2289 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2290 struct ocfs2_inode_info *oi = OCFS2_I(inode);
2291 struct ocfs2_unwritten_extent *ue = NULL;
2292 struct buffer_head *di_bh = NULL;
2293 struct ocfs2_dinode *di;
2294 struct ocfs2_alloc_context *data_ac = NULL;
2295 struct ocfs2_alloc_context *meta_ac = NULL;
2296 handle_t *handle = NULL;
2297 loff_t end = offset + bytes;
2298 int ret = 0, credits = 0, locked = 0;
2300 ocfs2_init_dealloc_ctxt(&dealloc);
2302 /* We do clear unwritten, delete orphan, change i_size here. If neither
2303 * of these happen, we can skip all this. */
2304 if (list_empty(&dwc->dw_zero_list) &&
2305 end <= i_size_read(inode) &&
2309 /* ocfs2_file_write_iter will get i_mutex, so we need not lock if we
2310 * are in that context. */
2311 if (dwc->dw_writer_pid != task_pid_nr(current)) {
2316 ret = ocfs2_inode_lock(inode, &di_bh, 1);
2322 down_write(&oi->ip_alloc_sem);
2324 /* Delete orphan before acquire i_mutex. */
2325 if (dwc->dw_orphaned) {
2326 BUG_ON(dwc->dw_writer_pid != task_pid_nr(current));
2328 end = end > i_size_read(inode) ? end : 0;
2330 ret = ocfs2_del_inode_from_orphan(osb, inode, di_bh,
2336 di = (struct ocfs2_dinode *)di_bh->b_data;
2338 ocfs2_init_dinode_extent_tree(&et, INODE_CACHE(inode), di_bh);
2340 /* Attach dealloc with extent tree in case that we may reuse extents
2341 * which are already unlinked from current extent tree due to extent
2342 * rotation and merging.
2344 et.et_dealloc = &dealloc;
2346 ret = ocfs2_lock_allocators(inode, &et, 0, dwc->dw_zero_count*2,
2347 &data_ac, &meta_ac);
2353 credits = ocfs2_calc_extend_credits(inode->i_sb, &di->id2.i_list);
2355 handle = ocfs2_start_trans(osb, credits);
2356 if (IS_ERR(handle)) {
2357 ret = PTR_ERR(handle);
2361 ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh,
2362 OCFS2_JOURNAL_ACCESS_WRITE);
2368 list_for_each_entry(ue, &dwc->dw_zero_list, ue_node) {
2369 ret = ocfs2_mark_extent_written(inode, &et, handle,
2379 if (end > i_size_read(inode)) {
2380 ret = ocfs2_set_inode_size(handle, inode, di_bh, end);
2385 ocfs2_commit_trans(osb, handle);
2387 up_write(&oi->ip_alloc_sem);
2388 ocfs2_inode_unlock(inode, 1);
2392 ocfs2_free_alloc_context(data_ac);
2394 ocfs2_free_alloc_context(meta_ac);
2395 ocfs2_run_deallocs(osb, &dealloc);
2397 inode_unlock(inode);
2398 ocfs2_dio_free_write_ctx(inode, dwc);
2404 * ocfs2_dio_end_io is called by the dio core when a dio is finished. We're
2405 * particularly interested in the aio/dio case. We use the rw_lock DLM lock
2406 * to protect io on one node from truncation on another.
2408 static int ocfs2_dio_end_io(struct kiocb *iocb,
2413 struct inode *inode = file_inode(iocb->ki_filp);
2417 /* this io's submitter should not have unlocked this before we could */
2418 BUG_ON(!ocfs2_iocb_is_rw_locked(iocb));
2421 mlog_ratelimited(ML_ERROR, "Direct IO failed, bytes = %lld",
2425 ret = ocfs2_dio_end_io_write(inode, private, offset,
2428 ocfs2_dio_free_write_ctx(inode, private);
2431 ocfs2_iocb_clear_rw_locked(iocb);
2433 level = ocfs2_iocb_rw_locked_level(iocb);
2434 ocfs2_rw_unlock(inode, level);
2438 static ssize_t ocfs2_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
2440 struct file *file = iocb->ki_filp;
2441 struct inode *inode = file->f_mapping->host;
2442 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2443 get_block_t *get_block;
2446 * Fallback to buffered I/O if we see an inode without
2449 if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL)
2452 /* Fallback to buffered I/O if we do not support append dio. */
2453 if (iocb->ki_pos + iter->count > i_size_read(inode) &&
2454 !ocfs2_supports_append_dio(osb))
2457 if (iov_iter_rw(iter) == READ)
2458 get_block = ocfs2_lock_get_block;
2460 get_block = ocfs2_dio_wr_get_block;
2462 return __blockdev_direct_IO(iocb, inode, inode->i_sb->s_bdev,
2464 ocfs2_dio_end_io, NULL, 0);
2467 const struct address_space_operations ocfs2_aops = {
2468 .readpage = ocfs2_readpage,
2469 .readahead = ocfs2_readahead,
2470 .writepage = ocfs2_writepage,
2471 .write_begin = ocfs2_write_begin,
2472 .write_end = ocfs2_write_end,
2474 .direct_IO = ocfs2_direct_IO,
2475 .invalidatepage = block_invalidatepage,
2476 .releasepage = ocfs2_releasepage,
2477 .migratepage = buffer_migrate_page,
2478 .is_partially_uptodate = block_is_partially_uptodate,
2479 .error_remove_page = generic_error_remove_page,