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Diffstat (limited to '')
| -rw-r--r-- | fs/ocfs2/aops.c | 2487 |
1 files changed, 2487 insertions, 0 deletions
diff --git a/fs/ocfs2/aops.c b/fs/ocfs2/aops.c new file mode 100644 index 000000000..b6948813e --- /dev/null +++ b/fs/ocfs2/aops.c @@ -0,0 +1,2487 @@ +/* -*- mode: c; c-basic-offset: 8; -*- + * vim: noexpandtab sw=8 ts=8 sts=0: + * + * Copyright (C) 2002, 2004 Oracle. All rights reserved. + * + * 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; either + * version 2 of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will 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. + * + * You should have received a copy of the GNU General Public + * License along with this program; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 021110-1307, USA. + */ + +#include <linux/fs.h> +#include <linux/slab.h> +#include <linux/highmem.h> +#include <linux/pagemap.h> +#include <asm/byteorder.h> +#include <linux/swap.h> +#include <linux/pipe_fs_i.h> +#include <linux/mpage.h> +#include <linux/quotaops.h> +#include <linux/blkdev.h> +#include <linux/uio.h> + +#include <cluster/masklog.h> + +#include "ocfs2.h" + +#include "alloc.h" +#include "aops.h" +#include "dlmglue.h" +#include "extent_map.h" +#include "file.h" +#include "inode.h" +#include "journal.h" +#include "suballoc.h" +#include "super.h" +#include "symlink.h" +#include "refcounttree.h" +#include "ocfs2_trace.h" + +#include "buffer_head_io.h" +#include "dir.h" +#include "namei.h" +#include "sysfile.h" + +static int ocfs2_symlink_get_block(struct inode *inode, sector_t iblock, + struct buffer_head *bh_result, int create) +{ + int err = -EIO; + int status; + struct ocfs2_dinode *fe = NULL; + struct buffer_head *bh = NULL; + struct buffer_head *buffer_cache_bh = NULL; + struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); + void *kaddr; + + trace_ocfs2_symlink_get_block( + (unsigned long long)OCFS2_I(inode)->ip_blkno, + (unsigned long long)iblock, bh_result, create); + + BUG_ON(ocfs2_inode_is_fast_symlink(inode)); + + if ((iblock << inode->i_sb->s_blocksize_bits) > PATH_MAX + 1) { + mlog(ML_ERROR, "block offset > PATH_MAX: %llu", + (unsigned long long)iblock); + goto bail; + } + + status = ocfs2_read_inode_block(inode, &bh); + if (status < 0) { + mlog_errno(status); + goto bail; + } + fe = (struct ocfs2_dinode *) bh->b_data; + + if ((u64)iblock >= ocfs2_clusters_to_blocks(inode->i_sb, + le32_to_cpu(fe->i_clusters))) { + err = -ENOMEM; + mlog(ML_ERROR, "block offset is outside the allocated size: " + "%llu\n", (unsigned long long)iblock); + goto bail; + } + + /* We don't use the page cache to create symlink data, so if + * need be, copy it over from the buffer cache. */ + if (!buffer_uptodate(bh_result) && ocfs2_inode_is_new(inode)) { + u64 blkno = le64_to_cpu(fe->id2.i_list.l_recs[0].e_blkno) + + iblock; + buffer_cache_bh = sb_getblk(osb->sb, blkno); + if (!buffer_cache_bh) { + err = -ENOMEM; + mlog(ML_ERROR, "couldn't getblock for symlink!\n"); + goto bail; + } + + /* we haven't locked out transactions, so a commit + * could've happened. Since we've got a reference on + * the bh, even if it commits while we're doing the + * copy, the data is still good. */ + if (buffer_jbd(buffer_cache_bh) + && ocfs2_inode_is_new(inode)) { + kaddr = kmap_atomic(bh_result->b_page); + if (!kaddr) { + mlog(ML_ERROR, "couldn't kmap!\n"); + goto bail; + } + memcpy(kaddr + (bh_result->b_size * iblock), + buffer_cache_bh->b_data, + bh_result->b_size); + kunmap_atomic(kaddr); + set_buffer_uptodate(bh_result); + } + brelse(buffer_cache_bh); + } + + map_bh(bh_result, inode->i_sb, + le64_to_cpu(fe->id2.i_list.l_recs[0].e_blkno) + iblock); + + err = 0; + +bail: + brelse(bh); + + return err; +} + +static int ocfs2_lock_get_block(struct inode *inode, sector_t iblock, + struct buffer_head *bh_result, int create) +{ + int ret = 0; + struct ocfs2_inode_info *oi = OCFS2_I(inode); + + down_read(&oi->ip_alloc_sem); + ret = ocfs2_get_block(inode, iblock, bh_result, create); + up_read(&oi->ip_alloc_sem); + + return ret; +} + +int ocfs2_get_block(struct inode *inode, sector_t iblock, + struct buffer_head *bh_result, int create) +{ + int err = 0; + unsigned int ext_flags; + u64 max_blocks = bh_result->b_size >> inode->i_blkbits; + u64 p_blkno, count, past_eof; + struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); + + trace_ocfs2_get_block((unsigned long long)OCFS2_I(inode)->ip_blkno, + (unsigned long long)iblock, bh_result, create); + + if (OCFS2_I(inode)->ip_flags & OCFS2_INODE_SYSTEM_FILE) + mlog(ML_NOTICE, "get_block on system inode 0x%p (%lu)\n", + inode, inode->i_ino); + + if (S_ISLNK(inode->i_mode)) { + /* this always does I/O for some reason. */ + err = ocfs2_symlink_get_block(inode, iblock, bh_result, create); + goto bail; + } + + err = ocfs2_extent_map_get_blocks(inode, iblock, &p_blkno, &count, + &ext_flags); + if (err) { + mlog(ML_ERROR, "Error %d from get_blocks(0x%p, %llu, 1, " + "%llu, NULL)\n", err, inode, (unsigned long long)iblock, + (unsigned long long)p_blkno); + goto bail; + } + + if (max_blocks < count) + count = max_blocks; + + /* + * ocfs2 never allocates in this function - the only time we + * need to use BH_New is when we're extending i_size on a file + * system which doesn't support holes, in which case BH_New + * allows __block_write_begin() to zero. + * + * If we see this on a sparse file system, then a truncate has + * raced us and removed the cluster. In this case, we clear + * the buffers dirty and uptodate bits and let the buffer code + * ignore it as a hole. + */ + if (create && p_blkno == 0 && ocfs2_sparse_alloc(osb)) { + clear_buffer_dirty(bh_result); + clear_buffer_uptodate(bh_result); + goto bail; + } + + /* Treat the unwritten extent as a hole for zeroing purposes. */ + if (p_blkno && !(ext_flags & OCFS2_EXT_UNWRITTEN)) + map_bh(bh_result, inode->i_sb, p_blkno); + + bh_result->b_size = count << inode->i_blkbits; + + if (!ocfs2_sparse_alloc(osb)) { + if (p_blkno == 0) { + err = -EIO; + mlog(ML_ERROR, + "iblock = %llu p_blkno = %llu blkno=(%llu)\n", + (unsigned long long)iblock, + (unsigned long long)p_blkno, + (unsigned long long)OCFS2_I(inode)->ip_blkno); + mlog(ML_ERROR, "Size %llu, clusters %u\n", (unsigned long long)i_size_read(inode), OCFS2_I(inode)->ip_clusters); + dump_stack(); + goto bail; + } + } + + past_eof = ocfs2_blocks_for_bytes(inode->i_sb, i_size_read(inode)); + + trace_ocfs2_get_block_end((unsigned long long)OCFS2_I(inode)->ip_blkno, + (unsigned long long)past_eof); + if (create && (iblock >= past_eof)) + set_buffer_new(bh_result); + +bail: + if (err < 0) + err = -EIO; + + return err; +} + +int ocfs2_read_inline_data(struct inode *inode, struct page *page, + struct buffer_head *di_bh) +{ + void *kaddr; + loff_t size; + struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data; + + if (!(le16_to_cpu(di->i_dyn_features) & OCFS2_INLINE_DATA_FL)) { + ocfs2_error(inode->i_sb, "Inode %llu lost inline data flag\n", + (unsigned long long)OCFS2_I(inode)->ip_blkno); + return -EROFS; + } + + size = i_size_read(inode); + + if (size > PAGE_SIZE || + size > ocfs2_max_inline_data_with_xattr(inode->i_sb, di)) { + ocfs2_error(inode->i_sb, + "Inode %llu has with inline data has bad size: %Lu\n", + (unsigned long long)OCFS2_I(inode)->ip_blkno, + (unsigned long long)size); + return -EROFS; + } + + kaddr = kmap_atomic(page); + if (size) + memcpy(kaddr, di->id2.i_data.id_data, size); + /* Clear the remaining part of the page */ + memset(kaddr + size, 0, PAGE_SIZE - size); + flush_dcache_page(page); + kunmap_atomic(kaddr); + + SetPageUptodate(page); + + return 0; +} + +static int ocfs2_readpage_inline(struct inode *inode, struct page *page) +{ + int ret; + struct buffer_head *di_bh = NULL; + + BUG_ON(!PageLocked(page)); + BUG_ON(!(OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL)); + + ret = ocfs2_read_inode_block(inode, &di_bh); + if (ret) { + mlog_errno(ret); + goto out; + } + + ret = ocfs2_read_inline_data(inode, page, di_bh); +out: + unlock_page(page); + + brelse(di_bh); + return ret; +} + +static int ocfs2_readpage(struct file *file, struct page *page) +{ + struct inode *inode = page->mapping->host; + struct ocfs2_inode_info *oi = OCFS2_I(inode); + loff_t start = (loff_t)page->index << PAGE_SHIFT; + int ret, unlock = 1; + + trace_ocfs2_readpage((unsigned long long)oi->ip_blkno, + (page ? page->index : 0)); + + ret = ocfs2_inode_lock_with_page(inode, NULL, 0, page); + if (ret != 0) { + if (ret == AOP_TRUNCATED_PAGE) + unlock = 0; + mlog_errno(ret); + goto out; + } + + if (down_read_trylock(&oi->ip_alloc_sem) == 0) { + /* + * Unlock the page and cycle ip_alloc_sem so that we don't + * busyloop waiting for ip_alloc_sem to unlock + */ + ret = AOP_TRUNCATED_PAGE; + unlock_page(page); + unlock = 0; + down_read(&oi->ip_alloc_sem); + up_read(&oi->ip_alloc_sem); + goto out_inode_unlock; + } + + /* + * i_size might have just been updated as we grabed the meta lock. We + * might now be discovering a truncate that hit on another node. + * block_read_full_page->get_block freaks out if it is asked to read + * beyond the end of a file, so we check here. Callers + * (generic_file_read, vm_ops->fault) are clever enough to check i_size + * and notice that the page they just read isn't needed. + * + * XXX sys_readahead() seems to get that wrong? + */ + if (start >= i_size_read(inode)) { + zero_user(page, 0, PAGE_SIZE); + SetPageUptodate(page); + ret = 0; + goto out_alloc; + } + + if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) + ret = ocfs2_readpage_inline(inode, page); + else + ret = block_read_full_page(page, ocfs2_get_block); + unlock = 0; + +out_alloc: + up_read(&oi->ip_alloc_sem); +out_inode_unlock: + ocfs2_inode_unlock(inode, 0); +out: + if (unlock) + unlock_page(page); + return ret; +} + +/* + * This is used only for read-ahead. Failures or difficult to handle + * situations are safe to ignore. + * + * Right now, we don't bother with BH_Boundary - in-inode extent lists + * are quite large (243 extents on 4k blocks), so most inodes don't + * grow out to a tree. If need be, detecting boundary extents could + * trivially be added in a future version of ocfs2_get_block(). + */ +static int ocfs2_readpages(struct file *filp, struct address_space *mapping, + struct list_head *pages, unsigned nr_pages) +{ + int ret, err = -EIO; + struct inode *inode = mapping->host; + struct ocfs2_inode_info *oi = OCFS2_I(inode); + loff_t start; + struct page *last; + + /* + * Use the nonblocking flag for the dlm code to avoid page + * lock inversion, but don't bother with retrying. + */ + ret = ocfs2_inode_lock_full(inode, NULL, 0, OCFS2_LOCK_NONBLOCK); + if (ret) + return err; + + if (down_read_trylock(&oi->ip_alloc_sem) == 0) { + ocfs2_inode_unlock(inode, 0); + return err; + } + + /* + * Don't bother with inline-data. There isn't anything + * to read-ahead in that case anyway... + */ + if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) + goto out_unlock; + + /* + * Check whether a remote node truncated this file - we just + * drop out in that case as it's not worth handling here. + */ + last = list_entry(pages->prev, struct page, lru); + start = (loff_t)last->index << PAGE_SHIFT; + if (start >= i_size_read(inode)) + goto out_unlock; + + err = mpage_readpages(mapping, pages, nr_pages, ocfs2_get_block); + +out_unlock: + up_read(&oi->ip_alloc_sem); + ocfs2_inode_unlock(inode, 0); + + return err; +} + +/* Note: Because we don't support holes, our allocation has + * already happened (allocation writes zeros to the file data) + * so we don't have to worry about ordered writes in + * ocfs2_writepage. + * + * ->writepage is called during the process of invalidating the page cache + * during blocked lock processing. It can't block on any cluster locks + * to during block mapping. It's relying on the fact that the block + * mapping can't have disappeared under the dirty pages that it is + * being asked to write back. + */ +static int ocfs2_writepage(struct page *page, struct writeback_control *wbc) +{ + trace_ocfs2_writepage( + (unsigned long long)OCFS2_I(page->mapping->host)->ip_blkno, + page->index); + + return block_write_full_page(page, ocfs2_get_block, wbc); +} + +/* Taken from ext3. We don't necessarily need the full blown + * functionality yet, but IMHO it's better to cut and paste the whole + * thing so we can avoid introducing our own bugs (and easily pick up + * their fixes when they happen) --Mark */ +int walk_page_buffers( handle_t *handle, + struct buffer_head *head, + unsigned from, + unsigned to, + int *partial, + int (*fn)( handle_t *handle, + struct buffer_head *bh)) +{ + struct buffer_head *bh; + unsigned block_start, block_end; + unsigned blocksize = head->b_size; + int err, ret = 0; + struct buffer_head *next; + + for ( bh = head, block_start = 0; + ret == 0 && (bh != head || !block_start); + block_start = block_end, bh = next) + { + next = bh->b_this_page; + block_end = block_start + blocksize; + if (block_end <= from || block_start >= to) { + if (partial && !buffer_uptodate(bh)) + *partial = 1; + continue; + } + err = (*fn)(handle, bh); + if (!ret) + ret = err; + } + return ret; +} + +static sector_t ocfs2_bmap(struct address_space *mapping, sector_t block) +{ + sector_t status; + u64 p_blkno = 0; + int err = 0; + struct inode *inode = mapping->host; + + trace_ocfs2_bmap((unsigned long long)OCFS2_I(inode)->ip_blkno, + (unsigned long long)block); + + /* + * The swap code (ab-)uses ->bmap to get a block mapping and then + * bypasseѕ the file system for actual I/O. We really can't allow + * that on refcounted inodes, so we have to skip out here. And yes, + * 0 is the magic code for a bmap error.. + */ + if (ocfs2_is_refcount_inode(inode)) + return 0; + + /* We don't need to lock journal system files, since they aren't + * accessed concurrently from multiple nodes. + */ + if (!INODE_JOURNAL(inode)) { + err = ocfs2_inode_lock(inode, NULL, 0); + if (err) { + if (err != -ENOENT) + mlog_errno(err); + goto bail; + } + down_read(&OCFS2_I(inode)->ip_alloc_sem); + } + + if (!(OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL)) + err = ocfs2_extent_map_get_blocks(inode, block, &p_blkno, NULL, + NULL); + + if (!INODE_JOURNAL(inode)) { + up_read(&OCFS2_I(inode)->ip_alloc_sem); + ocfs2_inode_unlock(inode, 0); + } + + if (err) { + mlog(ML_ERROR, "get_blocks() failed, block = %llu\n", + (unsigned long long)block); + mlog_errno(err); + goto bail; + } + +bail: + status = err ? 0 : p_blkno; + + return status; +} + +static int ocfs2_releasepage(struct page *page, gfp_t wait) +{ + if (!page_has_buffers(page)) + return 0; + return try_to_free_buffers(page); +} + +static void ocfs2_figure_cluster_boundaries(struct ocfs2_super *osb, + u32 cpos, + unsigned int *start, + unsigned int *end) +{ + unsigned int cluster_start = 0, cluster_end = PAGE_SIZE; + + if (unlikely(PAGE_SHIFT > osb->s_clustersize_bits)) { + unsigned int cpp; + + cpp = 1 << (PAGE_SHIFT - osb->s_clustersize_bits); + + cluster_start = cpos % cpp; + cluster_start = cluster_start << osb->s_clustersize_bits; + + cluster_end = cluster_start + osb->s_clustersize; + } + + BUG_ON(cluster_start > PAGE_SIZE); + BUG_ON(cluster_end > PAGE_SIZE); + + if (start) + *start = cluster_start; + if (end) + *end = cluster_end; +} + +/* + * 'from' and 'to' are the region in the page to avoid zeroing. + * + * If pagesize > clustersize, this function will avoid zeroing outside + * of the cluster boundary. + * + * from == to == 0 is code for "zero the entire cluster region" + */ +static void ocfs2_clear_page_regions(struct page *page, + struct ocfs2_super *osb, u32 cpos, + unsigned from, unsigned to) +{ + void *kaddr; + unsigned int cluster_start, cluster_end; + + ocfs2_figure_cluster_boundaries(osb, cpos, &cluster_start, &cluster_end); + + kaddr = kmap_atomic(page); + + if (from || to) { + if (from > cluster_start) + memset(kaddr + cluster_start, 0, from - cluster_start); + if (to < cluster_end) + memset(kaddr + to, 0, cluster_end - to); + } else { + memset(kaddr + cluster_start, 0, cluster_end - cluster_start); + } + + kunmap_atomic(kaddr); +} + +/* + * Nonsparse file systems fully allocate before we get to the write + * code. This prevents ocfs2_write() from tagging the write as an + * allocating one, which means ocfs2_map_page_blocks() might try to + * read-in the blocks at the tail of our file. Avoid reading them by + * testing i_size against each block offset. + */ +static int ocfs2_should_read_blk(struct inode *inode, struct page *page, + unsigned int block_start) +{ + u64 offset = page_offset(page) + block_start; + + if (ocfs2_sparse_alloc(OCFS2_SB(inode->i_sb))) + return 1; + + if (i_size_read(inode) > offset) + return 1; + + return 0; +} + +/* + * Some of this taken from __block_write_begin(). We already have our + * mapping by now though, and the entire write will be allocating or + * it won't, so not much need to use BH_New. + * + * This will also skip zeroing, which is handled externally. + */ +int ocfs2_map_page_blocks(struct page *page, u64 *p_blkno, + struct inode *inode, unsigned int from, + unsigned int to, int new) +{ + int ret = 0; + struct buffer_head *head, *bh, *wait[2], **wait_bh = wait; + unsigned int block_end, block_start; + unsigned int bsize = i_blocksize(inode); + + if (!page_has_buffers(page)) + create_empty_buffers(page, bsize, 0); + + head = page_buffers(page); + for (bh = head, block_start = 0; bh != head || !block_start; + bh = bh->b_this_page, block_start += bsize) { + block_end = block_start + bsize; + + clear_buffer_new(bh); + + /* + * Ignore blocks outside of our i/o range - + * they may belong to unallocated clusters. + */ + if (block_start >= to || block_end <= from) { + if (PageUptodate(page)) + set_buffer_uptodate(bh); + continue; + } + + /* + * For an allocating write with cluster size >= page + * size, we always write the entire page. + */ + if (new) + set_buffer_new(bh); + + if (!buffer_mapped(bh)) { + map_bh(bh, inode->i_sb, *p_blkno); + clean_bdev_bh_alias(bh); + } + + if (PageUptodate(page)) { + if (!buffer_uptodate(bh)) + set_buffer_uptodate(bh); + } else if (!buffer_uptodate(bh) && !buffer_delay(bh) && + !buffer_new(bh) && + ocfs2_should_read_blk(inode, page, block_start) && + (block_start < from || block_end > to)) { + ll_rw_block(REQ_OP_READ, 0, 1, &bh); + *wait_bh++=bh; + } + + *p_blkno = *p_blkno + 1; + } + + /* + * If we issued read requests - let them complete. + */ + while(wait_bh > wait) { + wait_on_buffer(*--wait_bh); + if (!buffer_uptodate(*wait_bh)) + ret = -EIO; + } + + if (ret == 0 || !new) + return ret; + + /* + * If we get -EIO above, zero out any newly allocated blocks + * to avoid exposing stale data. + */ + bh = head; + block_start = 0; + do { + block_end = block_start + bsize; + if (block_end <= from) + goto next_bh; + if (block_start >= to) + break; + + zero_user(page, block_start, bh->b_size); + set_buffer_uptodate(bh); + mark_buffer_dirty(bh); + +next_bh: + block_start = block_end; + bh = bh->b_this_page; + } while (bh != head); + + return ret; +} + +#if (PAGE_SIZE >= OCFS2_MAX_CLUSTERSIZE) +#define OCFS2_MAX_CTXT_PAGES 1 +#else +#define OCFS2_MAX_CTXT_PAGES (OCFS2_MAX_CLUSTERSIZE / PAGE_SIZE) +#endif + +#define OCFS2_MAX_CLUSTERS_PER_PAGE (PAGE_SIZE / OCFS2_MIN_CLUSTERSIZE) + +struct ocfs2_unwritten_extent { + struct list_head ue_node; + struct list_head ue_ip_node; + u32 ue_cpos; + u32 ue_phys; +}; + +/* + * Describe the state of a single cluster to be written to. + */ +struct ocfs2_write_cluster_desc { + u32 c_cpos; + u32 c_phys; + /* + * Give this a unique field because c_phys eventually gets + * filled. + */ + unsigned c_new; + unsigned c_clear_unwritten; + unsigned c_needs_zero; +}; + +struct ocfs2_write_ctxt { + /* Logical cluster position / len of write */ + u32 w_cpos; + u32 w_clen; + + /* First cluster allocated in a nonsparse extend */ + u32 w_first_new_cpos; + + /* Type of caller. Must be one of buffer, mmap, direct. */ + ocfs2_write_type_t w_type; + + struct ocfs2_write_cluster_desc w_desc[OCFS2_MAX_CLUSTERS_PER_PAGE]; + + /* + * This is true if page_size > cluster_size. + * + * It triggers a set of special cases during write which might + * have to deal with allocating writes to partial pages. + */ + unsigned int w_large_pages; + + /* + * Pages involved in this write. + * + * w_target_page is the page being written to by the user. + * + * w_pages is an array of pages which always contains + * w_target_page, and in the case of an allocating write with + * page_size < cluster size, it will contain zero'd and mapped + * pages adjacent to w_target_page which need to be written + * out in so that future reads from that region will get + * zero's. + */ + unsigned int w_num_pages; + struct page *w_pages[OCFS2_MAX_CTXT_PAGES]; + struct page *w_target_page; + + /* + * w_target_locked is used for page_mkwrite path indicating no unlocking + * against w_target_page in ocfs2_write_end_nolock. + */ + unsigned int w_target_locked:1; + + /* + * ocfs2_write_end() uses this to know what the real range to + * write in the target should be. + */ + unsigned int w_target_from; + unsigned int w_target_to; + + /* + * We could use journal_current_handle() but this is cleaner, + * IMHO -Mark + */ + handle_t *w_handle; + + struct buffer_head *w_di_bh; + + struct ocfs2_cached_dealloc_ctxt w_dealloc; + + struct list_head w_unwritten_list; + unsigned int w_unwritten_count; +}; + +void ocfs2_unlock_and_free_pages(struct page **pages, int num_pages) +{ + int i; + + for(i = 0; i < num_pages; i++) { + if (pages[i]) { + unlock_page(pages[i]); + mark_page_accessed(pages[i]); + put_page(pages[i]); + } + } +} + +static void ocfs2_unlock_pages(struct ocfs2_write_ctxt *wc) +{ + int i; + + /* + * w_target_locked is only set to true in the page_mkwrite() case. + * The intent is to allow us to lock the target page from write_begin() + * to write_end(). The caller must hold a ref on w_target_page. + */ + if (wc->w_target_locked) { + BUG_ON(!wc->w_target_page); + for (i = 0; i < wc->w_num_pages; i++) { + if (wc->w_target_page == wc->w_pages[i]) { + wc->w_pages[i] = NULL; + break; + } + } + mark_page_accessed(wc->w_target_page); + put_page(wc->w_target_page); + } + ocfs2_unlock_and_free_pages(wc->w_pages, wc->w_num_pages); +} + +static void ocfs2_free_unwritten_list(struct inode *inode, + struct list_head *head) +{ + struct ocfs2_inode_info *oi = OCFS2_I(inode); + struct ocfs2_unwritten_extent *ue = NULL, *tmp = NULL; + + list_for_each_entry_safe(ue, tmp, head, ue_node) { + list_del(&ue->ue_node); + spin_lock(&oi->ip_lock); + list_del(&ue->ue_ip_node); + spin_unlock(&oi->ip_lock); + kfree(ue); + } +} + +static void ocfs2_free_write_ctxt(struct inode *inode, + struct ocfs2_write_ctxt *wc) +{ + ocfs2_free_unwritten_list(inode, &wc->w_unwritten_list); + ocfs2_unlock_pages(wc); + brelse(wc->w_di_bh); + kfree(wc); +} + +static int ocfs2_alloc_write_ctxt(struct ocfs2_write_ctxt **wcp, + struct ocfs2_super *osb, loff_t pos, + unsigned len, ocfs2_write_type_t type, + struct buffer_head *di_bh) +{ + u32 cend; + struct ocfs2_write_ctxt *wc; + + wc = kzalloc(sizeof(struct ocfs2_write_ctxt), GFP_NOFS); + if (!wc) + return -ENOMEM; + + wc->w_cpos = pos >> osb->s_clustersize_bits; + wc->w_first_new_cpos = UINT_MAX; + cend = (pos + len - 1) >> osb->s_clustersize_bits; + wc->w_clen = cend - wc->w_cpos + 1; + get_bh(di_bh); + wc->w_di_bh = di_bh; + wc->w_type = type; + + if (unlikely(PAGE_SHIFT > osb->s_clustersize_bits)) + wc->w_large_pages = 1; + else + wc->w_large_pages = 0; + + ocfs2_init_dealloc_ctxt(&wc->w_dealloc); + INIT_LIST_HEAD(&wc->w_unwritten_list); + + *wcp = wc; + + return 0; +} + +/* + * If a page has any new buffers, zero them out here, and mark them uptodate + * and dirty so they'll be written out (in order to prevent uninitialised + * block data from leaking). And clear the new bit. + */ +static void ocfs2_zero_new_buffers(struct page *page, unsigned from, unsigned to) +{ + unsigned int block_start, block_end; + struct buffer_head *head, *bh; + + BUG_ON(!PageLocked(page)); + if (!page_has_buffers(page)) + return; + + bh = head = page_buffers(page); + block_start = 0; + do { + block_end = block_start + bh->b_size; + + if (buffer_new(bh)) { + if (block_end > from && block_start < to) { + if (!PageUptodate(page)) { + unsigned start, end; + + start = max(from, block_start); + end = min(to, block_end); + + zero_user_segment(page, start, end); + set_buffer_uptodate(bh); + } + + clear_buffer_new(bh); + mark_buffer_dirty(bh); + } + } + + block_start = block_end; + bh = bh->b_this_page; + } while (bh != head); +} + +/* + * Only called when we have a failure during allocating write to write + * zero's to the newly allocated region. + */ +static void ocfs2_write_failure(struct inode *inode, + struct ocfs2_write_ctxt *wc, + loff_t user_pos, unsigned user_len) +{ + int i; + unsigned from = user_pos & (PAGE_SIZE - 1), + to = user_pos + user_len; + struct page *tmppage; + + if (wc->w_target_page) + ocfs2_zero_new_buffers(wc->w_target_page, from, to); + + for(i = 0; i < wc->w_num_pages; i++) { + tmppage = wc->w_pages[i]; + + if (tmppage && page_has_buffers(tmppage)) { + if (ocfs2_should_order_data(inode)) + ocfs2_jbd2_file_inode(wc->w_handle, inode); + + block_commit_write(tmppage, from, to); + } + } +} + +static int ocfs2_prepare_page_for_write(struct inode *inode, u64 *p_blkno, + struct ocfs2_write_ctxt *wc, + struct page *page, u32 cpos, + loff_t user_pos, unsigned user_len, + int new) +{ + int ret; + unsigned int map_from = 0, map_to = 0; + unsigned int cluster_start, cluster_end; + unsigned int user_data_from = 0, user_data_to = 0; + + ocfs2_figure_cluster_boundaries(OCFS2_SB(inode->i_sb), cpos, + &cluster_start, &cluster_end); + + /* treat the write as new if the a hole/lseek spanned across + * the page boundary. + */ + new = new | ((i_size_read(inode) <= page_offset(page)) && + (page_offset(page) <= user_pos)); + + if (page == wc->w_target_page) { + map_from = user_pos & (PAGE_SIZE - 1); + map_to = map_from + user_len; + + if (new) + ret = ocfs2_map_page_blocks(page, p_blkno, inode, + cluster_start, cluster_end, + new); + else + ret = ocfs2_map_page_blocks(page, p_blkno, inode, + map_from, map_to, new); + if (ret) { + mlog_errno(ret); + goto out; + } + + user_data_from = map_from; + user_data_to = map_to; + if (new) { + map_from = cluster_start; + map_to = cluster_end; + } + } else { + /* + * If we haven't allocated the new page yet, we + * shouldn't be writing it out without copying user + * data. This is likely a math error from the caller. + */ + BUG_ON(!new); + + map_from = cluster_start; + map_to = cluster_end; + + ret = ocfs2_map_page_blocks(page, p_blkno, inode, + cluster_start, cluster_end, new); + if (ret) { + mlog_errno(ret); + goto out; + } + } + + /* + * Parts of newly allocated pages need to be zero'd. + * + * Above, we have also rewritten 'to' and 'from' - as far as + * the rest of the function is concerned, the entire cluster + * range inside of a page needs to be written. + * + * We can skip this if the page is up to date - it's already + * been zero'd from being read in as a hole. + */ + if (new && !PageUptodate(page)) + ocfs2_clear_page_regions(page, OCFS2_SB(inode->i_sb), + cpos, user_data_from, user_data_to); + + flush_dcache_page(page); + +out: + return ret; +} + +/* + * This function will only grab one clusters worth of pages. + */ +static int ocfs2_grab_pages_for_write(struct address_space *mapping, + struct ocfs2_write_ctxt *wc, + u32 cpos, loff_t user_pos, + unsigned user_len, int new, + struct page *mmap_page) +{ + int ret = 0, i; + unsigned long start, target_index, end_index, index; + struct inode *inode = mapping->host; + loff_t last_byte; + + target_index = user_pos >> PAGE_SHIFT; + + /* + * Figure out how many pages we'll be manipulating here. For + * non allocating write, we just change the one + * page. Otherwise, we'll need a whole clusters worth. If we're + * writing past i_size, we only need enough pages to cover the + * last page of the write. + */ + if (new) { + wc->w_num_pages = ocfs2_pages_per_cluster(inode->i_sb); + start = ocfs2_align_clusters_to_page_index(inode->i_sb, cpos); + /* + * We need the index *past* the last page we could possibly + * touch. This is the page past the end of the write or + * i_size, whichever is greater. + */ + last_byte = max(user_pos + user_len, i_size_read(inode)); + BUG_ON(last_byte < 1); + end_index = ((last_byte - 1) >> PAGE_SHIFT) + 1; + if ((start + wc->w_num_pages) > end_index) + wc->w_num_pages = end_index - start; + } else { + wc->w_num_pages = 1; + start = target_index; + } + end_index = (user_pos + user_len - 1) >> PAGE_SHIFT; + + for(i = 0; i < wc->w_num_pages; i++) { + index = start + i; + + if (index >= target_index && index <= end_index && + wc->w_type == OCFS2_WRITE_MMAP) { + /* + * ocfs2_pagemkwrite() is a little different + * and wants us to directly use the page + * passed in. + */ + lock_page(mmap_page); + + /* Exit and let the caller retry */ + if (mmap_page->mapping != mapping) { + WARN_ON(mmap_page->mapping); + unlock_page(mmap_page); + ret = -EAGAIN; + goto out; + } + + get_page(mmap_page); + wc->w_pages[i] = mmap_page; + wc->w_target_locked = true; + } else if (index >= target_index && index <= end_index && + wc->w_type == OCFS2_WRITE_DIRECT) { + /* Direct write has no mapping page. */ + wc->w_pages[i] = NULL; + continue; + } else { + wc->w_pages[i] = find_or_create_page(mapping, index, + GFP_NOFS); + if (!wc->w_pages[i]) { + ret = -ENOMEM; + mlog_errno(ret); + goto out; + } + } + wait_for_stable_page(wc->w_pages[i]); + + if (index == target_index) + wc->w_target_page = wc->w_pages[i]; + } +out: + if (ret) + wc->w_target_locked = false; + return ret; +} + +/* + * Prepare a single cluster for write one cluster into the file. + */ +static int ocfs2_write_cluster(struct address_space *mapping, + u32 *phys, unsigned int new, + unsigned int clear_unwritten, + unsigned int should_zero, + struct ocfs2_alloc_context *data_ac, + struct ocfs2_alloc_context *meta_ac, + struct ocfs2_write_ctxt *wc, u32 cpos, + loff_t user_pos, unsigned user_len) +{ + int ret, i; + u64 p_blkno; + struct inode *inode = mapping->host; + struct ocfs2_extent_tree et; + int bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1); + + if (new) { + u32 tmp_pos; + + /* + * This is safe to call with the page locks - it won't take + * any additional semaphores or cluster locks. + */ + tmp_pos = cpos; + ret = ocfs2_add_inode_data(OCFS2_SB(inode->i_sb), inode, + &tmp_pos, 1, !clear_unwritten, + wc->w_di_bh, wc->w_handle, + data_ac, meta_ac, NULL); + /* + * This shouldn't happen because we must have already + * calculated the correct meta data allocation required. The + * internal tree allocation code should know how to increase + * transaction credits itself. + * + * If need be, we could handle -EAGAIN for a + * RESTART_TRANS here. + */ + mlog_bug_on_msg(ret == -EAGAIN, + "Inode %llu: EAGAIN return during allocation.\n", + (unsigned long long)OCFS2_I(inode)->ip_blkno); + if (ret < 0) { + mlog_errno(ret); + goto out; + } + } else if (clear_unwritten) { + ocfs2_init_dinode_extent_tree(&et, INODE_CACHE(inode), + wc->w_di_bh); + ret = ocfs2_mark_extent_written(inode, &et, + wc->w_handle, cpos, 1, *phys, + meta_ac, &wc->w_dealloc); + if (ret < 0) { + mlog_errno(ret); + goto out; + } + } + + /* + * The only reason this should fail is due to an inability to + * find the extent added. + */ + ret = ocfs2_get_clusters(inode, cpos, phys, NULL, NULL); + if (ret < 0) { + mlog(ML_ERROR, "Get physical blkno failed for inode %llu, " + "at logical cluster %u", + (unsigned long long)OCFS2_I(inode)->ip_blkno, cpos); + goto out; + } + + BUG_ON(*phys == 0); + + p_blkno = ocfs2_clusters_to_blocks(inode->i_sb, *phys); + if (!should_zero) + p_blkno += (user_pos >> inode->i_sb->s_blocksize_bits) & (u64)(bpc - 1); + + for(i = 0; i < wc->w_num_pages; i++) { + int tmpret; + + /* This is the direct io target page. */ + if (wc->w_pages[i] == NULL) { + p_blkno++; + continue; + } + + tmpret = ocfs2_prepare_page_for_write(inode, &p_blkno, wc, + wc->w_pages[i], cpos, + user_pos, user_len, + should_zero); + if (tmpret) { + mlog_errno(tmpret); + if (ret == 0) + ret = tmpret; + } + } + + /* + * We only have cleanup to do in case of allocating write. + */ + if (ret && new) + ocfs2_write_failure(inode, wc, user_pos, user_len); + +out: + + return ret; +} + +static int ocfs2_write_cluster_by_desc(struct address_space *mapping, + struct ocfs2_alloc_context *data_ac, + struct ocfs2_alloc_context *meta_ac, + struct ocfs2_write_ctxt *wc, + loff_t pos, unsigned len) +{ + int ret, i; + loff_t cluster_off; + unsigned int local_len = len; + struct ocfs2_write_cluster_desc *desc; + struct ocfs2_super *osb = OCFS2_SB(mapping->host->i_sb); + + for (i = 0; i < wc->w_clen; i++) { + desc = &wc->w_desc[i]; + + /* + * We have to make sure that the total write passed in + * doesn't extend past a single cluster. + */ + local_len = len; + cluster_off = pos & (osb->s_clustersize - 1); + if ((cluster_off + local_len) > osb->s_clustersize) + local_len = osb->s_clustersize - cluster_off; + + ret = ocfs2_write_cluster(mapping, &desc->c_phys, + desc->c_new, + desc->c_clear_unwritten, + desc->c_needs_zero, + data_ac, meta_ac, + wc, desc->c_cpos, pos, local_len); + if (ret) { + mlog_errno(ret); + goto out; + } + + len -= local_len; + pos += local_len; + } + + ret = 0; +out: + return ret; +} + +/* + * ocfs2_write_end() wants to know which parts of the target page it + * should complete the write on. It's easiest to compute them ahead of + * time when a more complete view of the write is available. + */ +static void ocfs2_set_target_boundaries(struct ocfs2_super *osb, + struct ocfs2_write_ctxt *wc, + loff_t pos, unsigned len, int alloc) +{ + struct ocfs2_write_cluster_desc *desc; + + wc->w_target_from = pos & (PAGE_SIZE - 1); + wc->w_target_to = wc->w_target_from + len; + + if (alloc == 0) + return; + + /* + * Allocating write - we may have different boundaries based + * on page size and cluster size. + * + * NOTE: We can no longer compute one value from the other as + * the actual write length and user provided length may be + * different. + */ + + if (wc->w_large_pages) { + /* + * We only care about the 1st and last cluster within + * our range and whether they should be zero'd or not. Either + * value may be extended out to the start/end of a + * newly allocated cluster. + */ + desc = &wc->w_desc[0]; + if (desc->c_needs_zero) + ocfs2_figure_cluster_boundaries(osb, + desc->c_cpos, + &wc->w_target_from, + NULL); + + desc = &wc->w_desc[wc->w_clen - 1]; + if (desc->c_needs_zero) + ocfs2_figure_cluster_boundaries(osb, + desc->c_cpos, + NULL, + &wc->w_target_to); + } else { + wc->w_target_from = 0; + wc->w_target_to = PAGE_SIZE; + } +} + +/* + * Check if this extent is marked UNWRITTEN by direct io. If so, we need not to + * do the zero work. And should not to clear UNWRITTEN since it will be cleared + * by the direct io procedure. + * If this is a new extent that allocated by direct io, we should mark it in + * the ip_unwritten_list. + */ +static int ocfs2_unwritten_check(struct inode *inode, + struct ocfs2_write_ctxt *wc, + struct ocfs2_write_cluster_desc *desc) +{ + struct ocfs2_inode_info *oi = OCFS2_I(inode); + struct ocfs2_unwritten_extent *ue = NULL, *new = NULL; + int ret = 0; + + if (!desc->c_needs_zero) + return 0; + +retry: + spin_lock(&oi->ip_lock); + /* Needs not to zero no metter buffer or direct. The one who is zero + * the cluster is doing zero. And he will clear unwritten after all + * cluster io finished. */ + list_for_each_entry(ue, &oi->ip_unwritten_list, ue_ip_node) { + if (desc->c_cpos == ue->ue_cpos) { + BUG_ON(desc->c_new); + desc->c_needs_zero = 0; + desc->c_clear_unwritten = 0; + goto unlock; + } + } + + if (wc->w_type != OCFS2_WRITE_DIRECT) + goto unlock; + + if (new == NULL) { + spin_unlock(&oi->ip_lock); + new = kmalloc(sizeof(struct ocfs2_unwritten_extent), + GFP_NOFS); + if (new == NULL) { + ret = -ENOMEM; + goto out; + } + goto retry; + } + /* This direct write will doing zero. */ + new->ue_cpos = desc->c_cpos; + new->ue_phys = desc->c_phys; + desc->c_clear_unwritten = 0; + list_add_tail(&new->ue_ip_node, &oi->ip_unwritten_list); + list_add_tail(&new->ue_node, &wc->w_unwritten_list); + wc->w_unwritten_count++; + new = NULL; +unlock: + spin_unlock(&oi->ip_lock); +out: + if (new) + kfree(new); + return ret; +} + +/* + * Populate each single-cluster write descriptor in the write context + * with information about the i/o to be done. + * + * Returns the number of clusters that will have to be allocated, as + * well as a worst case estimate of the number of extent records that + * would have to be created during a write to an unwritten region. + */ +static int ocfs2_populate_write_desc(struct inode *inode, + struct ocfs2_write_ctxt *wc, + unsigned int *clusters_to_alloc, + unsigned int *extents_to_split) +{ + int ret; + struct ocfs2_write_cluster_desc *desc; + unsigned int num_clusters = 0; + unsigned int ext_flags = 0; + u32 phys = 0; + int i; + + *clusters_to_alloc = 0; + *extents_to_split = 0; + + for (i = 0; i < wc->w_clen; i++) { + desc = &wc->w_desc[i]; + desc->c_cpos = wc->w_cpos + i; + + if (num_clusters == 0) { + /* + * Need to look up the next extent record. + */ + ret = ocfs2_get_clusters(inode, desc->c_cpos, &phys, + &num_clusters, &ext_flags); + if (ret) { + mlog_errno(ret); + goto out; + } + + /* We should already CoW the refcountd extent. */ + BUG_ON(ext_flags & OCFS2_EXT_REFCOUNTED); + + /* + * Assume worst case - that we're writing in + * the middle of the extent. + * + * We can assume that the write proceeds from + * left to right, in which case the extent + * insert code is smart enough to coalesce the + * next splits into the previous records created. + */ + if (ext_flags & OCFS2_EXT_UNWRITTEN) + *extents_to_split = *extents_to_split + 2; + } else if (phys) { + /* + * Only increment phys if it doesn't describe + * a hole. + */ + phys++; + } + + /* + * If w_first_new_cpos is < UINT_MAX, we have a non-sparse + * file that got extended. w_first_new_cpos tells us + * where the newly allocated clusters are so we can + * zero them. + */ + if (desc->c_cpos >= wc->w_first_new_cpos) { + BUG_ON(phys == 0); + desc->c_needs_zero = 1; + } + + desc->c_phys = phys; + if (phys == 0) { + desc->c_new = 1; + desc->c_needs_zero = 1; + desc->c_clear_unwritten = 1; + *clusters_to_alloc = *clusters_to_alloc + 1; + } + + if (ext_flags & OCFS2_EXT_UNWRITTEN) { + desc->c_clear_unwritten = 1; + desc->c_needs_zero = 1; + } + + ret = ocfs2_unwritten_check(inode, wc, desc); + if (ret) { + mlog_errno(ret); + goto out; + } + + num_clusters--; + } + + ret = 0; +out: + return ret; +} + +static int ocfs2_write_begin_inline(struct address_space *mapping, + struct inode *inode, + struct ocfs2_write_ctxt *wc) +{ + int ret; + struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); + struct page *page; + handle_t *handle; + struct ocfs2_dinode *di = (struct ocfs2_dinode *)wc->w_di_bh->b_data; + + handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS); + if (IS_ERR(handle)) { + ret = PTR_ERR(handle); + mlog_errno(ret); + goto out; + } + + page = find_or_create_page(mapping, 0, GFP_NOFS); + if (!page) { + ocfs2_commit_trans(osb, handle); + ret = -ENOMEM; + mlog_errno(ret); + goto out; + } + /* + * If we don't set w_num_pages then this page won't get unlocked + * and freed on cleanup of the write context. + */ + wc->w_pages[0] = wc->w_target_page = page; + wc->w_num_pages = 1; + + ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), wc->w_di_bh, + OCFS2_JOURNAL_ACCESS_WRITE); + if (ret) { + ocfs2_commit_trans(osb, handle); + + mlog_errno(ret); + goto out; + } + + if (!(OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL)) + ocfs2_set_inode_data_inline(inode, di); + + if (!PageUptodate(page)) { + ret = ocfs2_read_inline_data(inode, page, wc->w_di_bh); + if (ret) { + ocfs2_commit_trans(osb, handle); + + goto out; + } + } + + wc->w_handle = handle; +out: + return ret; +} + +int ocfs2_size_fits_inline_data(struct buffer_head *di_bh, u64 new_size) +{ + struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data; + + if (new_size <= le16_to_cpu(di->id2.i_data.id_count)) + return 1; + return 0; +} + +static int ocfs2_try_to_write_inline_data(struct address_space *mapping, + struct inode *inode, loff_t pos, + unsigned len, struct page *mmap_page, + struct ocfs2_write_ctxt *wc) +{ + int ret, written = 0; + loff_t end = pos + len; + struct ocfs2_inode_info *oi = OCFS2_I(inode); + struct ocfs2_dinode *di = NULL; + + trace_ocfs2_try_to_write_inline_data((unsigned long long)oi->ip_blkno, + len, (unsigned long long)pos, + oi->ip_dyn_features); + + /* + * Handle inodes which already have inline data 1st. + */ + if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) { + if (mmap_page == NULL && + ocfs2_size_fits_inline_data(wc->w_di_bh, end)) + goto do_inline_write; + + /* + * The write won't fit - we have to give this inode an + * inline extent list now. + */ + ret = ocfs2_convert_inline_data_to_extents(inode, wc->w_di_bh); + if (ret) + mlog_errno(ret); + goto out; + } + + /* + * Check whether the inode can accept inline data. + */ + if (oi->ip_clusters != 0 || i_size_read(inode) != 0) + return 0; + + /* + * Check whether the write can fit. + */ + di = (struct ocfs2_dinode *)wc->w_di_bh->b_data; + if (mmap_page || + end > ocfs2_max_inline_data_with_xattr(inode->i_sb, di)) + return 0; + +do_inline_write: + ret = ocfs2_write_begin_inline(mapping, inode, wc); + if (ret) { + mlog_errno(ret); + goto out; + } + + /* + * This signals to the caller that the data can be written + * inline. + */ + written = 1; +out: + return written ? written : ret; +} + +/* + * This function only does anything for file systems which can't + * handle sparse files. + * + * What we want to do here is fill in any hole between the current end + * of allocation and the end of our write. That way the rest of the + * write path can treat it as an non-allocating write, which has no + * special case code for sparse/nonsparse files. + */ +static int ocfs2_expand_nonsparse_inode(struct inode *inode, + struct buffer_head *di_bh, + loff_t pos, unsigned len, + struct ocfs2_write_ctxt *wc) +{ + int ret; + loff_t newsize = pos + len; + + BUG_ON(ocfs2_sparse_alloc(OCFS2_SB(inode->i_sb))); + + if (newsize <= i_size_read(inode)) + return 0; + + ret = ocfs2_extend_no_holes(inode, di_bh, newsize, pos); + if (ret) + mlog_errno(ret); + + /* There is no wc if this is call from direct. */ + if (wc) + wc->w_first_new_cpos = + ocfs2_clusters_for_bytes(inode->i_sb, i_size_read(inode)); + + return ret; +} + +static int ocfs2_zero_tail(struct inode *inode, struct buffer_head *di_bh, + loff_t pos) +{ + int ret = 0; + + BUG_ON(!ocfs2_sparse_alloc(OCFS2_SB(inode->i_sb))); + if (pos > i_size_read(inode)) + ret = ocfs2_zero_extend(inode, di_bh, pos); + + return ret; +} + +int ocfs2_write_begin_nolock(struct address_space *mapping, + loff_t pos, unsigned len, ocfs2_write_type_t type, + struct page **pagep, void **fsdata, + struct buffer_head *di_bh, struct page *mmap_page) +{ + int ret, cluster_of_pages, credits = OCFS2_INODE_UPDATE_CREDITS; + unsigned int clusters_to_alloc, extents_to_split, clusters_need = 0; + struct ocfs2_write_ctxt *wc; + struct inode *inode = mapping->host; + struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); + struct ocfs2_dinode *di; + struct ocfs2_alloc_context *data_ac = NULL; + struct ocfs2_alloc_context *meta_ac = NULL; + handle_t *handle; + struct ocfs2_extent_tree et; + int try_free = 1, ret1; + +try_again: + ret = ocfs2_alloc_write_ctxt(&wc, osb, pos, len, type, di_bh); + if (ret) { + mlog_errno(ret); + return ret; + } + + if (ocfs2_supports_inline_data(osb)) { + ret = ocfs2_try_to_write_inline_data(mapping, inode, pos, len, + mmap_page, wc); + if (ret == 1) { + ret = 0; + goto success; + } + if (ret < 0) { + mlog_errno(ret); + goto out; + } + } + + /* Direct io change i_size late, should not zero tail here. */ + if (type != OCFS2_WRITE_DIRECT) { + if (ocfs2_sparse_alloc(osb)) + ret = ocfs2_zero_tail(inode, di_bh, pos); + else + ret = ocfs2_expand_nonsparse_inode(inode, di_bh, pos, + len, wc); + if (ret) { + mlog_errno(ret); + goto out; + } + } + + ret = ocfs2_check_range_for_refcount(inode, pos, len); + if (ret < 0) { + mlog_errno(ret); + goto out; + } else if (ret == 1) { + clusters_need = wc->w_clen; + ret = ocfs2_refcount_cow(inode, di_bh, + wc->w_cpos, wc->w_clen, UINT_MAX); + if (ret) { + mlog_errno(ret); + goto out; + } + } + + ret = ocfs2_populate_write_desc(inode, wc, &clusters_to_alloc, + &extents_to_split); + if (ret) { + mlog_errno(ret); + goto out; + } + clusters_need += clusters_to_alloc; + + di = (struct ocfs2_dinode *)wc->w_di_bh->b_data; + + trace_ocfs2_write_begin_nolock( + (unsigned long long)OCFS2_I(inode)->ip_blkno, + (long long)i_size_read(inode), + le32_to_cpu(di->i_clusters), + pos, len, type, mmap_page, + clusters_to_alloc, extents_to_split); + + /* + * We set w_target_from, w_target_to here so that + * ocfs2_write_end() knows which range in the target page to + * write out. An allocation requires that we write the entire + * cluster range. + */ + if (clusters_to_alloc || extents_to_split) { + /* + * XXX: We are stretching the limits of + * ocfs2_lock_allocators(). It greatly over-estimates + * the work to be done. + */ + ocfs2_init_dinode_extent_tree(&et, INODE_CACHE(inode), + wc->w_di_bh); + ret = ocfs2_lock_allocators(inode, &et, + clusters_to_alloc, extents_to_split, + &data_ac, &meta_ac); + if (ret) { + mlog_errno(ret); + goto out; + } + + if (data_ac) + data_ac->ac_resv = &OCFS2_I(inode)->ip_la_data_resv; + + credits = ocfs2_calc_extend_credits(inode->i_sb, + &di->id2.i_list); + } else if (type == OCFS2_WRITE_DIRECT) + /* direct write needs not to start trans if no extents alloc. */ + goto success; + + /* + * We have to zero sparse allocated clusters, unwritten extent clusters, + * and non-sparse clusters we just extended. For non-sparse writes, + * we know zeros will only be needed in the first and/or last cluster. + */ + if (wc->w_clen && (wc->w_desc[0].c_needs_zero || + wc->w_desc[wc->w_clen - 1].c_needs_zero)) + cluster_of_pages = 1; + else + cluster_of_pages = 0; + + ocfs2_set_target_boundaries(osb, wc, pos, len, cluster_of_pages); + + handle = ocfs2_start_trans(osb, credits); + if (IS_ERR(handle)) { + ret = PTR_ERR(handle); + mlog_errno(ret); + goto out; + } + + wc->w_handle = handle; + + if (clusters_to_alloc) { + ret = dquot_alloc_space_nodirty(inode, + ocfs2_clusters_to_bytes(osb->sb, clusters_to_alloc)); + if (ret) + goto out_commit; + } + + ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), wc->w_di_bh, + OCFS2_JOURNAL_ACCESS_WRITE); + if (ret) { + mlog_errno(ret); + goto out_quota; + } + + /* + * Fill our page array first. That way we've grabbed enough so + * that we can zero and flush if we error after adding the + * extent. + */ + ret = ocfs2_grab_pages_for_write(mapping, wc, wc->w_cpos, pos, len, + cluster_of_pages, mmap_page); + if (ret && ret != -EAGAIN) { + mlog_errno(ret); + goto out_quota; + } + + /* + * ocfs2_grab_pages_for_write() returns -EAGAIN if it could not lock + * the target page. In this case, we exit with no error and no target + * page. This will trigger the caller, page_mkwrite(), to re-try + * the operation. + */ + if (ret == -EAGAIN) { + BUG_ON(wc->w_target_page); + ret = 0; + goto out_quota; + } + + ret = ocfs2_write_cluster_by_desc(mapping, data_ac, meta_ac, wc, pos, + len); + if (ret) { + mlog_errno(ret); + goto out_quota; + } + + if (data_ac) + ocfs2_free_alloc_context(data_ac); + if (meta_ac) + ocfs2_free_alloc_context(meta_ac); + +success: + if (pagep) + *pagep = wc->w_target_page; + *fsdata = wc; + return 0; +out_quota: + if (clusters_to_alloc) + dquot_free_space(inode, + ocfs2_clusters_to_bytes(osb->sb, clusters_to_alloc)); +out_commit: + ocfs2_commit_trans(osb, handle); + +out: + /* + * The mmapped page won't be unlocked in ocfs2_free_write_ctxt(), + * even in case of error here like ENOSPC and ENOMEM. So, we need + * to unlock the target page manually to prevent deadlocks when + * retrying again on ENOSPC, or when returning non-VM_FAULT_LOCKED + * to VM code. + */ + if (wc->w_target_locked) + unlock_page(mmap_page); + + ocfs2_free_write_ctxt(inode, wc); + + if (data_ac) { + ocfs2_free_alloc_context(data_ac); + data_ac = NULL; + } + if (meta_ac) { + ocfs2_free_alloc_context(meta_ac); + meta_ac = NULL; + } + + if (ret == -ENOSPC && try_free) { + /* + * Try to free some truncate log so that we can have enough + * clusters to allocate. + */ + try_free = 0; + + ret1 = ocfs2_try_to_free_truncate_log(osb, clusters_need); + if (ret1 == 1) + goto try_again; + + if (ret1 < 0) + mlog_errno(ret1); + } + + return ret; +} + +static int ocfs2_write_begin(struct file *file, struct address_space *mapping, + loff_t pos, unsigned len, unsigned flags, + struct page **pagep, void **fsdata) +{ + int ret; + struct buffer_head *di_bh = NULL; + struct inode *inode = mapping->host; + + ret = ocfs2_inode_lock(inode, &di_bh, 1); + if (ret) { + mlog_errno(ret); + return ret; + } + + /* + * Take alloc sem here to prevent concurrent lookups. That way + * the mapping, zeroing and tree manipulation within + * ocfs2_write() will be safe against ->readpage(). This + * should also serve to lock out allocation from a shared + * writeable region. + */ + down_write(&OCFS2_I(inode)->ip_alloc_sem); + + ret = ocfs2_write_begin_nolock(mapping, pos, len, OCFS2_WRITE_BUFFER, + pagep, fsdata, di_bh, NULL); + if (ret) { + mlog_errno(ret); + goto out_fail; + } + + brelse(di_bh); + + return 0; + +out_fail: + up_write(&OCFS2_I(inode)->ip_alloc_sem); + + brelse(di_bh); + ocfs2_inode_unlock(inode, 1); + + return ret; +} + +static void ocfs2_write_end_inline(struct inode *inode, loff_t pos, + unsigned len, unsigned *copied, + struct ocfs2_dinode *di, + struct ocfs2_write_ctxt *wc) +{ + void *kaddr; + + if (unlikely(*copied < len)) { + if (!PageUptodate(wc->w_target_page)) { + *copied = 0; + return; + } + } + + kaddr = kmap_atomic(wc->w_target_page); + memcpy(di->id2.i_data.id_data + pos, kaddr + pos, *copied); + kunmap_atomic(kaddr); + + trace_ocfs2_write_end_inline( + (unsigned long long)OCFS2_I(inode)->ip_blkno, + (unsigned long long)pos, *copied, + le16_to_cpu(di->id2.i_data.id_count), + le16_to_cpu(di->i_dyn_features)); +} + +int ocfs2_write_end_nolock(struct address_space *mapping, + loff_t pos, unsigned len, unsigned copied, void *fsdata) +{ + int i, ret; + unsigned from, to, start = pos & (PAGE_SIZE - 1); + struct inode *inode = mapping->host; + struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); + struct ocfs2_write_ctxt *wc = fsdata; + struct ocfs2_dinode *di = (struct ocfs2_dinode *)wc->w_di_bh->b_data; + handle_t *handle = wc->w_handle; + struct page *tmppage; + + BUG_ON(!list_empty(&wc->w_unwritten_list)); + + if (handle) { + ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), + wc->w_di_bh, OCFS2_JOURNAL_ACCESS_WRITE); + if (ret) { + copied = ret; + mlog_errno(ret); + goto out; + } + } + + if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) { + ocfs2_write_end_inline(inode, pos, len, &copied, di, wc); + goto out_write_size; + } + + if (unlikely(copied < len) && wc->w_target_page) { + if (!PageUptodate(wc->w_target_page)) + copied = 0; + + ocfs2_zero_new_buffers(wc->w_target_page, start+copied, + start+len); + } + if (wc->w_target_page) + flush_dcache_page(wc->w_target_page); + + for(i = 0; i < wc->w_num_pages; i++) { + tmppage = wc->w_pages[i]; + + /* This is the direct io target page. */ + if (tmppage == NULL) + continue; + + if (tmppage == wc->w_target_page) { + from = wc->w_target_from; + to = wc->w_target_to; + + BUG_ON(from > PAGE_SIZE || + to > PAGE_SIZE || + to < from); + } else { + /* + * Pages adjacent to the target (if any) imply + * a hole-filling write in which case we want + * to flush their entire range. + */ + from = 0; + to = PAGE_SIZE; + } + + if (page_has_buffers(tmppage)) { + if (handle && ocfs2_should_order_data(inode)) + ocfs2_jbd2_file_inode(handle, inode); + block_commit_write(tmppage, from, to); + } + } + +out_write_size: + /* Direct io do not update i_size here. */ + if (wc->w_type != OCFS2_WRITE_DIRECT) { + pos += copied; + if (pos > i_size_read(inode)) { + i_size_write(inode, pos); + mark_inode_dirty(inode); + } + inode->i_blocks = ocfs2_inode_sector_count(inode); + di->i_size = cpu_to_le64((u64)i_size_read(inode)); + inode->i_mtime = inode->i_ctime = current_time(inode); + di->i_mtime = di->i_ctime = cpu_to_le64(inode->i_mtime.tv_sec); + di->i_mtime_nsec = di->i_ctime_nsec = cpu_to_le32(inode->i_mtime.tv_nsec); + if (handle) + ocfs2_update_inode_fsync_trans(handle, inode, 1); + } + if (handle) + ocfs2_journal_dirty(handle, wc->w_di_bh); + +out: + /* unlock pages before dealloc since it needs acquiring j_trans_barrier + * lock, or it will cause a deadlock since journal commit threads holds + * this lock and will ask for the page lock when flushing the data. + * put it here to preserve the unlock order. + */ + ocfs2_unlock_pages(wc); + + if (handle) + ocfs2_commit_trans(osb, handle); + + ocfs2_run_deallocs(osb, &wc->w_dealloc); + + brelse(wc->w_di_bh); + kfree(wc); + + return copied; +} + +static int ocfs2_write_end(struct file *file, struct address_space *mapping, + loff_t pos, unsigned len, unsigned copied, + struct page *page, void *fsdata) +{ + int ret; + struct inode *inode = mapping->host; + + ret = ocfs2_write_end_nolock(mapping, pos, len, copied, fsdata); + + up_write(&OCFS2_I(inode)->ip_alloc_sem); + ocfs2_inode_unlock(inode, 1); + + return ret; +} + +struct ocfs2_dio_write_ctxt { + struct list_head dw_zero_list; + unsigned dw_zero_count; + int dw_orphaned; + pid_t dw_writer_pid; +}; + +static struct ocfs2_dio_write_ctxt * +ocfs2_dio_alloc_write_ctx(struct buffer_head *bh, int *alloc) +{ + struct ocfs2_dio_write_ctxt *dwc = NULL; + + if (bh->b_private) + return bh->b_private; + + dwc = kmalloc(sizeof(struct ocfs2_dio_write_ctxt), GFP_NOFS); + if (dwc == NULL) + return NULL; + INIT_LIST_HEAD(&dwc->dw_zero_list); + dwc->dw_zero_count = 0; + dwc->dw_orphaned = 0; + dwc->dw_writer_pid = task_pid_nr(current); + bh->b_private = dwc; + *alloc = 1; + + return dwc; +} + +static void ocfs2_dio_free_write_ctx(struct inode *inode, + struct ocfs2_dio_write_ctxt *dwc) +{ + ocfs2_free_unwritten_list(inode, &dwc->dw_zero_list); + kfree(dwc); +} + +/* + * TODO: Make this into a generic get_blocks function. + * + * From do_direct_io in direct-io.c: + * "So what we do is to permit the ->get_blocks function to populate + * bh.b_size with the size of IO which is permitted at this offset and + * this i_blkbits." + * + * This function is called directly from get_more_blocks in direct-io.c. + * + * called like this: dio->get_blocks(dio->inode, fs_startblk, + * fs_count, map_bh, dio->rw == WRITE); + */ +static int ocfs2_dio_wr_get_block(struct inode *inode, sector_t iblock, + struct buffer_head *bh_result, int create) +{ + struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); + struct ocfs2_inode_info *oi = OCFS2_I(inode); + struct ocfs2_write_ctxt *wc; + struct ocfs2_write_cluster_desc *desc = NULL; + struct ocfs2_dio_write_ctxt *dwc = NULL; + struct buffer_head *di_bh = NULL; + u64 p_blkno; + unsigned int i_blkbits = inode->i_sb->s_blocksize_bits; + loff_t pos = iblock << i_blkbits; + sector_t endblk = (i_size_read(inode) - 1) >> i_blkbits; + unsigned len, total_len = bh_result->b_size; + int ret = 0, first_get_block = 0; + + len = osb->s_clustersize - (pos & (osb->s_clustersize - 1)); + len = min(total_len, len); + + /* + * bh_result->b_size is count in get_more_blocks according to write + * "pos" and "end", we need map twice to return different buffer state: + * 1. area in file size, not set NEW; + * 2. area out file size, set NEW. + * + * iblock endblk + * |--------|---------|---------|--------- + * |<-------area in file------->| + */ + + if ((iblock <= endblk) && + ((iblock + ((len - 1) >> i_blkbits)) > endblk)) + len = (endblk - iblock + 1) << i_blkbits; + + mlog(0, "get block of %lu at %llu:%u req %u\n", + inode->i_ino, pos, len, total_len); + + /* + * Because we need to change file size in ocfs2_dio_end_io_write(), or + * we may need to add it to orphan dir. So can not fall to fast path + * while file size will be changed. + */ + if (pos + total_len <= i_size_read(inode)) { + + /* This is the fast path for re-write. */ + ret = ocfs2_lock_get_block(inode, iblock, bh_result, create); + if (buffer_mapped(bh_result) && + !buffer_new(bh_result) && + ret == 0) + goto out; + + /* Clear state set by ocfs2_get_block. */ + bh_result->b_state = 0; + } + + dwc = ocfs2_dio_alloc_write_ctx(bh_result, &first_get_block); + if (unlikely(dwc == NULL)) { + ret = -ENOMEM; + mlog_errno(ret); + goto out; + } + + if (ocfs2_clusters_for_bytes(inode->i_sb, pos + total_len) > + ocfs2_clusters_for_bytes(inode->i_sb, i_size_read(inode)) && + !dwc->dw_orphaned) { + /* + * when we are going to alloc extents beyond file size, add the + * inode to orphan dir, so we can recall those spaces when + * system crashed during write. + */ + ret = ocfs2_add_inode_to_orphan(osb, inode); + if (ret < 0) { + mlog_errno(ret); + goto out; + } + dwc->dw_orphaned = 1; + } + + ret = ocfs2_inode_lock(inode, &di_bh, 1); + if (ret) { + mlog_errno(ret); + goto out; + } + + down_write(&oi->ip_alloc_sem); + + if (first_get_block) { + if (ocfs2_sparse_alloc(osb)) + ret = ocfs2_zero_tail(inode, di_bh, pos); + else + ret = ocfs2_expand_nonsparse_inode(inode, di_bh, pos, + total_len, NULL); + if (ret < 0) { + mlog_errno(ret); + goto unlock; + } + } + + ret = ocfs2_write_begin_nolock(inode->i_mapping, pos, len, + OCFS2_WRITE_DIRECT, NULL, + (void **)&wc, di_bh, NULL); + if (ret) { + mlog_errno(ret); + goto unlock; + } + + desc = &wc->w_desc[0]; + + p_blkno = ocfs2_clusters_to_blocks(inode->i_sb, desc->c_phys); + BUG_ON(p_blkno == 0); + p_blkno += iblock & (u64)(ocfs2_clusters_to_blocks(inode->i_sb, 1) - 1); + + map_bh(bh_result, inode->i_sb, p_blkno); + bh_result->b_size = len; + if (desc->c_needs_zero) + set_buffer_new(bh_result); + + if (iblock > endblk) + set_buffer_new(bh_result); + + /* May sleep in end_io. It should not happen in a irq context. So defer + * it to dio work queue. */ + set_buffer_defer_completion(bh_result); + + if (!list_empty(&wc->w_unwritten_list)) { + struct ocfs2_unwritten_extent *ue = NULL; + + ue = list_first_entry(&wc->w_unwritten_list, + struct ocfs2_unwritten_extent, + ue_node); + BUG_ON(ue->ue_cpos != desc->c_cpos); + /* The physical address may be 0, fill it. */ + ue->ue_phys = desc->c_phys; + + list_splice_tail_init(&wc->w_unwritten_list, &dwc->dw_zero_list); + dwc->dw_zero_count += wc->w_unwritten_count; + } + + ret = ocfs2_write_end_nolock(inode->i_mapping, pos, len, len, wc); + BUG_ON(ret != len); + ret = 0; +unlock: + up_write(&oi->ip_alloc_sem); + ocfs2_inode_unlock(inode, 1); + brelse(di_bh); +out: + if (ret < 0) + ret = -EIO; + return ret; +} + +static int ocfs2_dio_end_io_write(struct inode *inode, + struct ocfs2_dio_write_ctxt *dwc, + loff_t offset, + ssize_t bytes) +{ + struct ocfs2_cached_dealloc_ctxt dealloc; + struct ocfs2_extent_tree et; + struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); + struct ocfs2_inode_info *oi = OCFS2_I(inode); + struct ocfs2_unwritten_extent *ue = NULL; + struct buffer_head *di_bh = NULL; + struct ocfs2_dinode *di; + struct ocfs2_alloc_context *data_ac = NULL; + struct ocfs2_alloc_context *meta_ac = NULL; + handle_t *handle = NULL; + loff_t end = offset + bytes; + int ret = 0, credits = 0; + + ocfs2_init_dealloc_ctxt(&dealloc); + + /* We do clear unwritten, delete orphan, change i_size here. If neither + * of these happen, we can skip all this. */ + if (list_empty(&dwc->dw_zero_list) && + end <= i_size_read(inode) && + !dwc->dw_orphaned) + goto out; + + ret = ocfs2_inode_lock(inode, &di_bh, 1); + if (ret < 0) { + mlog_errno(ret); + goto out; + } + + down_write(&oi->ip_alloc_sem); + + /* Delete orphan before acquire i_mutex. */ + if (dwc->dw_orphaned) { + BUG_ON(dwc->dw_writer_pid != task_pid_nr(current)); + + end = end > i_size_read(inode) ? end : 0; + + ret = ocfs2_del_inode_from_orphan(osb, inode, di_bh, + !!end, end); + if (ret < 0) + mlog_errno(ret); + } + + di = (struct ocfs2_dinode *)di_bh->b_data; + + ocfs2_init_dinode_extent_tree(&et, INODE_CACHE(inode), di_bh); + + /* Attach dealloc with extent tree in case that we may reuse extents + * which are already unlinked from current extent tree due to extent + * rotation and merging. + */ + et.et_dealloc = &dealloc; + + ret = ocfs2_lock_allocators(inode, &et, 0, dwc->dw_zero_count*2, + &data_ac, &meta_ac); + if (ret) { + mlog_errno(ret); + goto unlock; + } + + credits = ocfs2_calc_extend_credits(inode->i_sb, &di->id2.i_list); + + handle = ocfs2_start_trans(osb, credits); + if (IS_ERR(handle)) { + ret = PTR_ERR(handle); + mlog_errno(ret); + goto unlock; + } + ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh, + OCFS2_JOURNAL_ACCESS_WRITE); + if (ret) { + mlog_errno(ret); + goto commit; + } + + list_for_each_entry(ue, &dwc->dw_zero_list, ue_node) { + ret = ocfs2_mark_extent_written(inode, &et, handle, + ue->ue_cpos, 1, + ue->ue_phys, + meta_ac, &dealloc); + if (ret < 0) { + mlog_errno(ret); + break; + } + } + + if (end > i_size_read(inode)) { + ret = ocfs2_set_inode_size(handle, inode, di_bh, end); + if (ret < 0) + mlog_errno(ret); + } +commit: + ocfs2_commit_trans(osb, handle); +unlock: + up_write(&oi->ip_alloc_sem); + ocfs2_inode_unlock(inode, 1); + brelse(di_bh); +out: + if (data_ac) + ocfs2_free_alloc_context(data_ac); + if (meta_ac) + ocfs2_free_alloc_context(meta_ac); + ocfs2_run_deallocs(osb, &dealloc); + ocfs2_dio_free_write_ctx(inode, dwc); + + return ret; +} + +/* + * ocfs2_dio_end_io is called by the dio core when a dio is finished. We're + * particularly interested in the aio/dio case. We use the rw_lock DLM lock + * to protect io on one node from truncation on another. + */ +static int ocfs2_dio_end_io(struct kiocb *iocb, + loff_t offset, + ssize_t bytes, + void *private) +{ + struct inode *inode = file_inode(iocb->ki_filp); + int level; + int ret = 0; + + /* this io's submitter should not have unlocked this before we could */ + BUG_ON(!ocfs2_iocb_is_rw_locked(iocb)); + + if (bytes <= 0) + mlog_ratelimited(ML_ERROR, "Direct IO failed, bytes = %lld", + (long long)bytes); + if (private) { + if (bytes > 0) + ret = ocfs2_dio_end_io_write(inode, private, offset, + bytes); + else + ocfs2_dio_free_write_ctx(inode, private); + } + + ocfs2_iocb_clear_rw_locked(iocb); + + level = ocfs2_iocb_rw_locked_level(iocb); + ocfs2_rw_unlock(inode, level); + return ret; +} + +static ssize_t ocfs2_direct_IO(struct kiocb *iocb, struct iov_iter *iter) +{ + struct file *file = iocb->ki_filp; + struct inode *inode = file->f_mapping->host; + struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); + get_block_t *get_block; + + /* + * Fallback to buffered I/O if we see an inode without + * extents. + */ + if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) + return 0; + + /* Fallback to buffered I/O if we do not support append dio. */ + if (iocb->ki_pos + iter->count > i_size_read(inode) && + !ocfs2_supports_append_dio(osb)) + return 0; + + if (iov_iter_rw(iter) == READ) + get_block = ocfs2_lock_get_block; + else + get_block = ocfs2_dio_wr_get_block; + + return __blockdev_direct_IO(iocb, inode, inode->i_sb->s_bdev, + iter, get_block, + ocfs2_dio_end_io, NULL, 0); +} + +const struct address_space_operations ocfs2_aops = { + .readpage = ocfs2_readpage, + .readpages = ocfs2_readpages, + .writepage = ocfs2_writepage, + .write_begin = ocfs2_write_begin, + .write_end = ocfs2_write_end, + .bmap = ocfs2_bmap, + .direct_IO = ocfs2_direct_IO, + .invalidatepage = block_invalidatepage, + .releasepage = ocfs2_releasepage, + .migratepage = buffer_migrate_page, + .is_partially_uptodate = block_is_partially_uptodate, + .error_remove_page = generic_error_remove_page, +}; |