| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Ryan Ding | 4442 | 43.67% | 10 | 6.76% |
| Mark Fasheh | 4281 | 42.09% | 36 | 24.32% |
| Joseph Qi | 292 | 2.87% | 7 | 4.73% |
| Tao Ma | 196 | 1.93% | 8 | 5.41% |
| Joel Becker | 118 | 1.16% | 11 | 7.43% |
| Matthew Wilcox | 117 | 1.15% | 11 | 7.43% |
| Wengang Wang | 78 | 0.77% | 3 | 2.03% |
| yangwenfang | 76 | 0.75% | 1 | 0.68% |
| Sunil Mushran | 73 | 0.72% | 3 | 2.03% |
| Jia Guo | 68 | 0.67% | 1 | 0.68% |
| Jan Kara | 53 | 0.52% | 6 | 4.05% |
| Heming Zhao via Ocfs2-devel | 48 | 0.47% | 1 | 0.68% |
| Junxiao Bi | 43 | 0.42% | 3 | 2.03% |
| alex chen | 40 | 0.39% | 1 | 0.68% |
| Darrick J. Wong | 29 | 0.29% | 5 | 3.38% |
| Kirill A. Shutemov | 23 | 0.23% | 2 | 1.35% |
| Christoph Hellwig | 22 | 0.22% | 6 | 4.05% |
| Changwei Ge | 21 | 0.21% | 2 | 1.35% |
| Weiwei Wang | 20 | 0.20% | 1 | 0.68% |
| Coly Li | 16 | 0.16% | 1 | 0.68% |
| Eric Ren | 12 | 0.12% | 1 | 0.68% |
| Nicholas Piggin | 12 | 0.12% | 1 | 0.68% |
| Jeff Layton | 11 | 0.11% | 2 | 1.35% |
| Tiger Yang | 11 | 0.11% | 1 | 0.68% |
| Badari Pulavarty | 10 | 0.10% | 2 | 1.35% |
| Rui Xiang | 10 | 0.10% | 1 | 0.68% |
| Jiufei (Joyce) Xue | 6 | 0.06% | 1 | 0.68% |
| Tristan Ye | 5 | 0.05% | 1 | 0.68% |
| Hisashi Hifumi | 5 | 0.05% | 1 | 0.68% |
| Jia-Ju Bai | 4 | 0.04% | 1 | 0.68% |
| Andi Kleen | 3 | 0.03% | 1 | 0.68% |
| Fabian Frederick | 3 | 0.03% | 1 | 0.68% |
| Herbert Xu | 3 | 0.03% | 1 | 0.68% |
| Deepa Dinamani | 3 | 0.03% | 1 | 0.68% |
| Linus Torvalds (pre-git) | 3 | 0.03% | 2 | 1.35% |
| zhangyi (F) | 3 | 0.03% | 1 | 0.68% |
| Joe Perches | 2 | 0.02% | 1 | 0.68% |
| Jun Piao | 2 | 0.02% | 2 | 1.35% |
| Julia Lawall | 2 | 0.02% | 1 | 0.68% |
| Hongnan Li | 1 | 0.01% | 1 | 0.68% |
| Al Viro | 1 | 0.01% | 1 | 0.68% |
| Norton.Zhu | 1 | 0.01% | 1 | 0.68% |
| Yiwen Jiang | 1 | 0.01% | 1 | 0.68% |
| Thomas Gleixner | 1 | 0.01% | 1 | 0.68% |
| Masahiro Yamada | 1 | 0.01% | 1 | 0.68% |
| Total | 10172 | 148 |
// SPDX-License-Identifier: GPL-2.0-or-later /* * Copyright (C) 2002, 2004 Oracle. All rights reserved. */ #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/mpage.h> #include <linux/quotaops.h> #include <linux/blkdev.h> #include <linux/uio.h> #include <linux/mm.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_read_folio(struct file *file, struct folio *folio) { struct inode *inode = folio->mapping->host; struct ocfs2_inode_info *oi = OCFS2_I(inode); loff_t start = folio_pos(folio); int ret, unlock = 1; trace_ocfs2_readpage((unsigned long long)oi->ip_blkno, folio->index); ret = ocfs2_inode_lock_with_page(inode, NULL, 0, &folio->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 folio and cycle ip_alloc_sem so that we don't * busyloop waiting for ip_alloc_sem to unlock */ ret = AOP_TRUNCATED_PAGE; folio_unlock(folio); 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_folio->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 folio they just read isn't needed. * * XXX sys_readahead() seems to get that wrong? */ if (start >= i_size_read(inode)) { folio_zero_segment(folio, 0, folio_size(folio)); folio_mark_uptodate(folio); ret = 0; goto out_alloc; } if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) ret = ocfs2_readpage_inline(inode, &folio->page); else ret = block_read_full_folio(folio, ocfs2_get_block); unlock = 0; out_alloc: up_read(&oi->ip_alloc_sem); out_inode_unlock: ocfs2_inode_unlock(inode, 0); out: if (unlock) folio_unlock(folio); 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 void ocfs2_readahead(struct readahead_control *rac) { int ret; struct inode *inode = rac->mapping->host; struct ocfs2_inode_info *oi = OCFS2_I(inode); /* * 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; if (down_read_trylock(&oi->ip_alloc_sem) == 0) goto out_unlock; /* * 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_up; /* * Check whether a remote node truncated this file - we just * drop out in that case as it's not worth handling here. */ if (readahead_pos(rac) >= i_size_read(inode)) goto out_up; mpage_readahead(rac, ocfs2_get_block); out_up: up_read(&oi->ip_alloc_sem); out_unlock: ocfs2_inode_unlock(inode, 0); } /* 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_writepages. * * ->writepages 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_writepages(struct address_space *mapping, struct writeback_control *wbc) { return mpage_writepages(mapping, wbc, ocfs2_get_block); } /* 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 bool ocfs2_release_folio(struct folio *folio, gfp_t wait) { if (!folio_buffers(folio)) return false; return try_to_free_buffers(folio); } 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 folio *folio, unsigned int block_start) { u64 offset = folio_pos(folio) + 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) { struct folio *folio = page_folio(page); 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); head = folio_buffers(folio); if (!head) head = create_empty_buffers(folio, bsize, 0); 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 (folio_test_uptodate(folio)) 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 (folio_test_uptodate(folio)) { set_buffer_uptodate(bh); } else if (!buffer_uptodate(bh) && !buffer_delay(bh) && !buffer_new(bh) && ocfs2_should_read_blk(inode, folio, block_start) && (block_start < from || block_end > to)) { bh_read_nowait(bh, 0); *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; folio_zero_range(folio, 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_inode_add_write(wc->w_handle, inode, user_pos, user_len); 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: 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) { /* * 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 (type == OCFS2_WRITE_MMAP && ret == -EAGAIN) { BUG_ON(wc->w_target_page); ret = 0; goto out_quota; } mlog_errno(ret); 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, 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 ->read_folio(). 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) { loff_t new_isize; if (!PageUptodate(wc->w_target_page)) copied = 0; new_isize = max_t(loff_t, i_size_read(inode), pos + copied); if (new_isize > page_offset(wc->w_target_page)) ocfs2_zero_new_buffers(wc->w_target_page, start+copied, start+len); else { /* * When page is fully beyond new isize (data copy * failed), do not bother zeroing the page. Invalidate * it instead so that writeback does not get confused * put page & buffer dirty bits into inconsistent * state. */ block_invalidate_folio(page_folio(wc->w_target_page), 0, PAGE_SIZE); } } 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)) { loff_t start_byte = ((loff_t)tmppage->index << PAGE_SHIFT) + from; loff_t length = to - from; ocfs2_jbd2_inode_add_write(handle, inode, start_byte, length); } 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_set_mtime_to_ts(inode, inode_set_ctime_current(inode)); di->i_mtime = di->i_ctime = cpu_to_le64(inode_get_mtime_sec(inode)); di->i_mtime_nsec = di->i_ctime_nsec = cpu_to_le32(inode_get_mtime_nsec(inode)); 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_rwsem. */ 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, 0); } const struct address_space_operations ocfs2_aops = { .dirty_folio = block_dirty_folio, .read_folio = ocfs2_read_folio, .readahead = ocfs2_readahead, .writepages = ocfs2_writepages, .write_begin = ocfs2_write_begin, .write_end = ocfs2_write_end, .bmap = ocfs2_bmap, .direct_IO = ocfs2_direct_IO, .invalidate_folio = block_invalidate_folio, .release_folio = ocfs2_release_folio, .migrate_folio = buffer_migrate_folio, .is_partially_uptodate = block_is_partially_uptodate, .error_remove_folio = generic_error_remove_folio, };
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