| // 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 page *page = &folio->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_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 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_folio(page_folio(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 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_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 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 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)) { |
| 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_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) { |
| 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)) { |
| 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->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_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, NULL, 0); |
| } |
| |
| const struct address_space_operations ocfs2_aops = { |
| .dirty_folio = block_dirty_folio, |
| .read_folio = ocfs2_read_folio, |
| .readahead = ocfs2_readahead, |
| .writepage = ocfs2_writepage, |
| .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, |
| .migratepage = buffer_migrate_page, |
| .is_partially_uptodate = block_is_partially_uptodate, |
| .error_remove_page = generic_error_remove_page, |
| }; |