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fs/ocfs2/aops.c
53.1 KB
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/* -*- mode: c; c-basic-offset: 8; -*- * vim: noexpandtab sw=8 ts=8 sts=0: * * Copyright (C) 2002, 2004 Oracle. All rights reserved. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public * License as published by the Free Software Foundation; either * version 2 of the License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. * * You should have received a copy of the GNU General Public * License along with this program; if not, write to the * Free Software Foundation, Inc., 59 Temple Place - Suite 330, * Boston, MA 021110-1307, USA. */ #include <linux/fs.h> #include <linux/slab.h> #include <linux/highmem.h> #include <linux/pagemap.h> #include <asm/byteorder.h> |
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#include <linux/swap.h> |
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#include <linux/pipe_fs_i.h> |
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#include <linux/mpage.h> |
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#include <linux/quotaops.h> |
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#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" |
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#include "suballoc.h" |
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#include "super.h" #include "symlink.h" |
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#include "refcounttree.h" |
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#include "ocfs2_trace.h" |
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#include "buffer_head_io.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; |
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trace_ocfs2_symlink_get_block( (unsigned long long)OCFS2_I(inode)->ip_blkno, (unsigned long long)iblock, bh_result, create); |
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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; } |
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status = ocfs2_read_inode_block(inode, &bh); |
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if (status < 0) { mlog_errno(status); goto bail; } fe = (struct ocfs2_dinode *) bh->b_data; |
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if ((u64)iblock >= ocfs2_clusters_to_blocks(inode->i_sb, le32_to_cpu(fe->i_clusters))) { mlog(ML_ERROR, "block offset is outside the allocated size: " "%llu ", (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) { mlog(ML_ERROR, "couldn't getblock for symlink! "); 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, KM_USER0); if (!kaddr) { mlog(ML_ERROR, "couldn't kmap! "); goto bail; } memcpy(kaddr + (bh_result->b_size * iblock), buffer_cache_bh->b_data, bh_result->b_size); kunmap_atomic(kaddr, KM_USER0); 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: |
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brelse(bh); |
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|
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return err; } |
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int ocfs2_get_block(struct inode *inode, sector_t iblock, struct buffer_head *bh_result, int create) |
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{ int err = 0; |
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unsigned int ext_flags; |
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u64 max_blocks = bh_result->b_size >> inode->i_blkbits; u64 p_blkno, count, past_eof; |
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struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
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|
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trace_ocfs2_get_block((unsigned long long)OCFS2_I(inode)->ip_blkno, (unsigned long long)iblock, bh_result, create); |
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if (OCFS2_I(inode)->ip_flags & OCFS2_INODE_SYSTEM_FILE) mlog(ML_NOTICE, "get_block on system inode 0x%p (%lu) ", 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; } |
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err = ocfs2_extent_map_get_blocks(inode, iblock, &p_blkno, &count, |
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&ext_flags); |
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if (err) { mlog(ML_ERROR, "Error %d from get_blocks(0x%p, %llu, 1, " |
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"%llu, NULL) ", err, inode, (unsigned long long)iblock, (unsigned long long)p_blkno); |
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goto bail; } |
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if (max_blocks < count) count = max_blocks; |
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/* * 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 |
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* allows __block_write_begin() to zero. |
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* * 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. |
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*/ |
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if (create && p_blkno == 0 && ocfs2_sparse_alloc(osb)) { clear_buffer_dirty(bh_result); clear_buffer_uptodate(bh_result); goto bail; } |
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|
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/* Treat the unwritten extent as a hole for zeroing purposes. */ if (p_blkno && !(ext_flags & OCFS2_EXT_UNWRITTEN)) |
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map_bh(bh_result, inode->i_sb, p_blkno); |
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bh_result->b_size = count << inode->i_blkbits; |
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if (!ocfs2_sparse_alloc(osb)) { if (p_blkno == 0) { err = -EIO; mlog(ML_ERROR, "iblock = %llu p_blkno = %llu blkno=(%llu) ", (unsigned long long)iblock, (unsigned long long)p_blkno, (unsigned long long)OCFS2_I(inode)->ip_blkno); mlog(ML_ERROR, "Size %llu, clusters %u ", (unsigned long long)i_size_read(inode), OCFS2_I(inode)->ip_clusters); dump_stack(); |
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goto bail; |
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} |
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} |
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|
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past_eof = ocfs2_blocks_for_bytes(inode->i_sb, i_size_read(inode)); |
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trace_ocfs2_get_block_end((unsigned long long)OCFS2_I(inode)->ip_blkno, (unsigned long long)past_eof); |
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if (create && (iblock >= past_eof)) set_buffer_new(bh_result); |
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bail: if (err < 0) err = -EIO; |
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return err; } |
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int ocfs2_read_inline_data(struct inode *inode, struct page *page, struct buffer_head *di_bh) |
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{ void *kaddr; |
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loff_t size; |
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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", (unsigned long long)OCFS2_I(inode)->ip_blkno); return -EROFS; } size = i_size_read(inode); if (size > PAGE_CACHE_SIZE || |
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size > ocfs2_max_inline_data_with_xattr(inode->i_sb, di)) { |
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ocfs2_error(inode->i_sb, |
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"Inode %llu has with inline data has bad size: %Lu", (unsigned long long)OCFS2_I(inode)->ip_blkno, (unsigned long long)size); |
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return -EROFS; } kaddr = kmap_atomic(page, KM_USER0); if (size) memcpy(kaddr, di->id2.i_data.id_data, size); /* Clear the remaining part of the page */ memset(kaddr + size, 0, PAGE_CACHE_SIZE - size); flush_dcache_page(page); kunmap_atomic(kaddr, KM_USER0); SetPageUptodate(page); return 0; } static int ocfs2_readpage_inline(struct inode *inode, struct page *page) { int ret; struct buffer_head *di_bh = NULL; |
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BUG_ON(!PageLocked(page)); |
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BUG_ON(!(OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL)); |
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ret = ocfs2_read_inode_block(inode, &di_bh); |
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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; } |
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static int ocfs2_readpage(struct file *file, struct page *page) { struct inode *inode = page->mapping->host; |
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struct ocfs2_inode_info *oi = OCFS2_I(inode); |
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loff_t start = (loff_t)page->index << PAGE_CACHE_SHIFT; int ret, unlock = 1; |
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trace_ocfs2_readpage((unsigned long long)oi->ip_blkno, (page ? page->index : 0)); |
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ret = ocfs2_inode_lock_with_page(inode, NULL, 0, page); |
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if (ret != 0) { if (ret == AOP_TRUNCATED_PAGE) unlock = 0; mlog_errno(ret); goto out; } |
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if (down_read_trylock(&oi->ip_alloc_sem) == 0) { |
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/* * Unlock the page and cycle ip_alloc_sem so that we don't * busyloop waiting for ip_alloc_sem to unlock */ |
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ret = AOP_TRUNCATED_PAGE; |
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unlock_page(page); unlock = 0; down_read(&oi->ip_alloc_sem); up_read(&oi->ip_alloc_sem); |
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goto out_inode_unlock; |
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} |
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/* * i_size might have just been updated as we grabed the meta lock. We * might now be discovering a truncate that hit on another node. * block_read_full_page->get_block freaks out if it is asked to read * beyond the end of a file, so we check here. Callers |
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* (generic_file_read, vm_ops->fault) are clever enough to check i_size |
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* 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)) { |
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zero_user(page, 0, PAGE_SIZE); |
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SetPageUptodate(page); ret = 0; goto out_alloc; } |
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if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) ret = ocfs2_readpage_inline(inode, page); else ret = block_read_full_page(page, ocfs2_get_block); |
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unlock = 0; |
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out_alloc: up_read(&OCFS2_I(inode)->ip_alloc_sem); |
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out_inode_unlock: ocfs2_inode_unlock(inode, 0); |
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out: if (unlock) unlock_page(page); |
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return ret; } |
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/* * This is used only for read-ahead. Failures or difficult to handle * situations are safe to ignore. * * Right now, we don't bother with BH_Boundary - in-inode extent lists * are quite large (243 extents on 4k blocks), so most inodes don't * grow out to a tree. If need be, detecting boundary extents could * trivially be added in a future version of ocfs2_get_block(). */ static int ocfs2_readpages(struct file *filp, struct address_space *mapping, struct list_head *pages, unsigned nr_pages) { int ret, err = -EIO; struct inode *inode = mapping->host; struct ocfs2_inode_info *oi = OCFS2_I(inode); loff_t start; struct page *last; /* * Use the nonblocking flag for the dlm code to avoid page * lock inversion, but don't bother with retrying. */ ret = ocfs2_inode_lock_full(inode, NULL, 0, OCFS2_LOCK_NONBLOCK); if (ret) return err; if (down_read_trylock(&oi->ip_alloc_sem) == 0) { ocfs2_inode_unlock(inode, 0); return err; } /* * Don't bother with inline-data. There isn't anything * to read-ahead in that case anyway... */ if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) goto out_unlock; /* * Check whether a remote node truncated this file - we just * drop out in that case as it's not worth handling here. */ last = list_entry(pages->prev, struct page, lru); start = (loff_t)last->index << PAGE_CACHE_SHIFT; if (start >= i_size_read(inode)) goto out_unlock; err = mpage_readpages(mapping, pages, nr_pages, ocfs2_get_block); out_unlock: up_read(&oi->ip_alloc_sem); ocfs2_inode_unlock(inode, 0); return err; } |
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/* 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) { |
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trace_ocfs2_writepage( (unsigned long long)OCFS2_I(page->mapping->host)->ip_blkno, page->index); |
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|
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return block_write_full_page(page, ocfs2_get_block, wbc); |
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} |
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/* 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 */ |
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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)) |
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{ 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; } |
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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; |
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trace_ocfs2_bmap((unsigned long long)OCFS2_I(inode)->ip_blkno, (unsigned long long)block); |
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/* We don't need to lock journal system files, since they aren't * accessed concurrently from multiple nodes. */ if (!INODE_JOURNAL(inode)) { |
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err = ocfs2_inode_lock(inode, NULL, 0); |
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if (err) { if (err != -ENOENT) mlog_errno(err); goto bail; } down_read(&OCFS2_I(inode)->ip_alloc_sem); } |
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if (!(OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL)) err = ocfs2_extent_map_get_blocks(inode, block, &p_blkno, NULL, NULL); |
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if (!INODE_JOURNAL(inode)) { up_read(&OCFS2_I(inode)->ip_alloc_sem); |
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ocfs2_inode_unlock(inode, 0); |
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} if (err) { mlog(ML_ERROR, "get_blocks() failed, block = %llu ", (unsigned long long)block); mlog_errno(err); goto bail; } |
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bail: status = err ? 0 : p_blkno; |
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return status; } /* * 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); |
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* * Note that we never bother to allocate blocks here, and thus ignore the * create argument. |
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*/ static int ocfs2_direct_IO_get_blocks(struct inode *inode, sector_t iblock, |
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struct buffer_head *bh_result, int create) { int ret; |
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u64 p_blkno, inode_blocks, contig_blocks; |
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unsigned int ext_flags; |
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unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits; |
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unsigned long max_blocks = bh_result->b_size >> inode->i_blkbits; |
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|
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/* This function won't even be called if the request isn't all * nicely aligned and of the right size, so there's no need * for us to check any of that. */ |
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inode_blocks = ocfs2_blocks_for_bytes(inode->i_sb, i_size_read(inode)); |
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|
ccd979bdb [PATCH] OCFS2: Th... |
508 509 |
/* This figures out the size of the next contiguous block, and * our logical offset */ |
363041a5f ocfs2: temporaril... |
510 |
ret = ocfs2_extent_map_get_blocks(inode, iblock, &p_blkno, |
49cb8d2d4 ocfs2: Read from ... |
511 |
&contig_blocks, &ext_flags); |
ccd979bdb [PATCH] OCFS2: Th... |
512 513 514 515 516 517 518 |
if (ret) { mlog(ML_ERROR, "get_blocks() failed iblock=%llu ", (unsigned long long)iblock); ret = -EIO; goto bail; } |
cbaee472f ocfs2: Only bug o... |
519 520 |
/* We should already CoW the refcounted extent in case of create. */ BUG_ON(create && (ext_flags & OCFS2_EXT_REFCOUNTED)); |
25baf2da1 ocfs2: Teach ocfs... |
521 522 523 |
/* * get_more_blocks() expects us to describe a hole by clearing * the mapped bit on bh_result(). |
49cb8d2d4 ocfs2: Read from ... |
524 525 |
* * Consider an unwritten extent as a hole. |
25baf2da1 ocfs2: Teach ocfs... |
526 |
*/ |
49cb8d2d4 ocfs2: Read from ... |
527 |
if (p_blkno && !(ext_flags & OCFS2_EXT_UNWRITTEN)) |
25baf2da1 ocfs2: Teach ocfs... |
528 |
map_bh(bh_result, inode->i_sb, p_blkno); |
5fe878ae7 direct-io: cleanu... |
529 |
else |
25baf2da1 ocfs2: Teach ocfs... |
530 |
clear_buffer_mapped(bh_result); |
ccd979bdb [PATCH] OCFS2: Th... |
531 532 533 534 535 536 537 538 539 |
/* make sure we don't map more than max_blocks blocks here as that's all the kernel will handle at this point. */ if (max_blocks < contig_blocks) contig_blocks = max_blocks; bh_result->b_size = contig_blocks << blocksize_bits; bail: return ret; } |
2bd632165 ocfs2/trivial: Re... |
540 |
/* |
ccd979bdb [PATCH] OCFS2: Th... |
541 |
* ocfs2_dio_end_io is called by the dio core when a dio is finished. We're |
bd5fe6c5e fs: kill i_alloc_sem |
542 543 |
* particularly interested in the aio/dio case. We use the rw_lock DLM lock * to protect io on one node from truncation on another. |
ccd979bdb [PATCH] OCFS2: Th... |
544 545 546 547 |
*/ static void ocfs2_dio_end_io(struct kiocb *iocb, loff_t offset, ssize_t bytes, |
40e2e9731 direct-io: move a... |
548 549 550 |
void *private, int ret, bool is_async) |
ccd979bdb [PATCH] OCFS2: Th... |
551 |
{ |
d28c91740 [PATCH] struct pa... |
552 |
struct inode *inode = iocb->ki_filp->f_path.dentry->d_inode; |
7cdfc3a1c ocfs2: Remember r... |
553 |
int level; |
a11f7e63c ocfs2: serialize ... |
554 |
wait_queue_head_t *wq = ocfs2_ioend_wq(inode); |
ccd979bdb [PATCH] OCFS2: Th... |
555 556 557 |
/* this io's submitter should not have unlocked this before we could */ BUG_ON(!ocfs2_iocb_is_rw_locked(iocb)); |
7cdfc3a1c ocfs2: Remember r... |
558 |
|
df2d6f265 fs: always mainta... |
559 |
if (ocfs2_iocb_is_sem_locked(iocb)) |
39c99f12f Ocfs2: Teach 'coh... |
560 |
ocfs2_iocb_clear_sem_locked(iocb); |
39c99f12f Ocfs2: Teach 'coh... |
561 |
|
a11f7e63c ocfs2: serialize ... |
562 563 564 565 566 567 568 569 |
if (ocfs2_iocb_is_unaligned_aio(iocb)) { ocfs2_iocb_clear_unaligned_aio(iocb); if (atomic_dec_and_test(&OCFS2_I(inode)->ip_unaligned_aio) && waitqueue_active(wq)) { wake_up_all(wq); } } |
ccd979bdb [PATCH] OCFS2: Th... |
570 |
ocfs2_iocb_clear_rw_locked(iocb); |
7cdfc3a1c ocfs2: Remember r... |
571 572 |
level = ocfs2_iocb_rw_locked_level(iocb); |
7cdfc3a1c ocfs2: Remember r... |
573 |
ocfs2_rw_unlock(inode, level); |
40e2e9731 direct-io: move a... |
574 575 576 |
if (is_async) aio_complete(iocb, ret, 0); |
72c5052dd fs: move inode_di... |
577 |
inode_dio_done(inode); |
ccd979bdb [PATCH] OCFS2: Th... |
578 |
} |
03f981cf2 ocfs2: add some m... |
579 580 581 582 583 584 585 586 |
/* * ocfs2_invalidatepage() and ocfs2_releasepage() are shamelessly stolen * from ext3. PageChecked() bits have been removed as OCFS2 does not * do journalled data. */ static void ocfs2_invalidatepage(struct page *page, unsigned long offset) { journal_t *journal = OCFS2_SB(page->mapping->host->i_sb)->journal->j_journal; |
2b4e30fbd ocfs2: Switch ove... |
587 |
jbd2_journal_invalidatepage(journal, page, offset); |
03f981cf2 ocfs2: add some m... |
588 589 590 591 592 593 594 595 |
} static int ocfs2_releasepage(struct page *page, gfp_t wait) { journal_t *journal = OCFS2_SB(page->mapping->host->i_sb)->journal->j_journal; if (!page_has_buffers(page)) return 0; |
2b4e30fbd ocfs2: Switch ove... |
596 |
return jbd2_journal_try_to_free_buffers(journal, page, wait); |
03f981cf2 ocfs2: add some m... |
597 |
} |
ccd979bdb [PATCH] OCFS2: Th... |
598 599 600 601 602 603 604 |
static ssize_t ocfs2_direct_IO(int rw, struct kiocb *iocb, const struct iovec *iov, loff_t offset, unsigned long nr_segs) { struct file *file = iocb->ki_filp; |
d28c91740 [PATCH] struct pa... |
605 |
struct inode *inode = file->f_path.dentry->d_inode->i_mapping->host; |
53013cba4 ocfs2: take data ... |
606 |
|
6798d35a3 ocfs2: Read suppo... |
607 608 609 610 611 612 |
/* * 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; |
b80474b43 ocfs2: Use buffer... |
613 614 615 |
/* Fallback to buffered I/O if we are appending. */ if (i_size_read(inode) <= offset) return 0; |
c1e8d35ef ocfs2: Remove EXI... |
616 617 618 619 |
return __blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov, offset, nr_segs, ocfs2_direct_IO_get_blocks, ocfs2_dio_end_io, NULL, 0); |
ccd979bdb [PATCH] OCFS2: Th... |
620 |
} |
9517bac6c ocfs2: teach ocfs... |
621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 |
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_CACHE_SIZE; if (unlikely(PAGE_CACHE_SHIFT > osb->s_clustersize_bits)) { unsigned int cpp; cpp = 1 << (PAGE_CACHE_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, KM_USER0); 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, KM_USER0); } /* |
4e9563fd5 ocfs2: fix write(... |
680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 |
* 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; } /* |
ebdec241d fs: kill block_pr... |
701 |
* Some of this taken from __block_write_begin(). We already have our |
9517bac6c ocfs2: teach ocfs... |
702 703 704 705 706 |
* 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. */ |
60b11392f ocfs2: zero tail ... |
707 708 709 |
int ocfs2_map_page_blocks(struct page *page, u64 *p_blkno, struct inode *inode, unsigned int from, unsigned int to, int new) |
9517bac6c ocfs2: teach ocfs... |
710 711 712 713 714 715 716 717 718 719 720 721 722 |
{ int ret = 0; struct buffer_head *head, *bh, *wait[2], **wait_bh = wait; unsigned int block_end, block_start; unsigned int bsize = 1 << inode->i_blkbits; 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; |
3a307ffc2 ocfs2: rework ocf... |
723 |
clear_buffer_new(bh); |
9517bac6c ocfs2: teach ocfs... |
724 725 726 727 |
/* * Ignore blocks outside of our i/o range - * they may belong to unallocated clusters. */ |
60b11392f ocfs2: zero tail ... |
728 |
if (block_start >= to || block_end <= from) { |
9517bac6c ocfs2: teach ocfs... |
729 730 731 732 733 734 735 736 737 |
if (PageUptodate(page)) set_buffer_uptodate(bh); continue; } /* * For an allocating write with cluster size >= page * size, we always write the entire page. */ |
3a307ffc2 ocfs2: rework ocf... |
738 739 |
if (new) set_buffer_new(bh); |
9517bac6c ocfs2: teach ocfs... |
740 741 742 743 744 745 746 747 748 749 |
if (!buffer_mapped(bh)) { map_bh(bh, inode->i_sb, *p_blkno); unmap_underlying_metadata(bh->b_bdev, bh->b_blocknr); } if (PageUptodate(page)) { if (!buffer_uptodate(bh)) set_buffer_uptodate(bh); } else if (!buffer_uptodate(bh) && !buffer_delay(bh) && |
bce997682 ocfs2: harden buf... |
750 |
!buffer_new(bh) && |
4e9563fd5 ocfs2: fix write(... |
751 |
ocfs2_should_read_blk(inode, page, block_start) && |
bce997682 ocfs2: harden buf... |
752 |
(block_start < from || block_end > to)) { |
9517bac6c ocfs2: teach ocfs... |
753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 |
ll_rw_block(READ, 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 { |
9517bac6c ocfs2: teach ocfs... |
779 780 781 782 783 |
block_end = block_start + bsize; if (block_end <= from) goto next_bh; if (block_start >= to) break; |
eebd2aa35 Pagecache zeroing... |
784 |
zero_user(page, block_start, bh->b_size); |
9517bac6c ocfs2: teach ocfs... |
785 786 787 788 789 790 791 792 793 794 |
set_buffer_uptodate(bh); mark_buffer_dirty(bh); next_bh: block_start = block_end; bh = bh->b_this_page; } while (bh != head); return ret; } |
3a307ffc2 ocfs2: rework ocf... |
795 796 797 798 799 800 801 |
#if (PAGE_CACHE_SIZE >= OCFS2_MAX_CLUSTERSIZE) #define OCFS2_MAX_CTXT_PAGES 1 #else #define OCFS2_MAX_CTXT_PAGES (OCFS2_MAX_CLUSTERSIZE / PAGE_CACHE_SIZE) #endif #define OCFS2_MAX_CLUSTERS_PER_PAGE (PAGE_CACHE_SIZE / OCFS2_MIN_CLUSTERSIZE) |
9517bac6c ocfs2: teach ocfs... |
802 |
/* |
3a307ffc2 ocfs2: rework ocf... |
803 |
* Describe the state of a single cluster to be written to. |
6af67d820 ocfs2: Use own sp... |
804 |
*/ |
3a307ffc2 ocfs2: rework ocf... |
805 806 807 808 809 810 811 812 |
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; |
b27b7cbcf ocfs2: support wr... |
813 |
unsigned c_unwritten; |
e7432675f ocfs2: Initialize... |
814 |
unsigned c_needs_zero; |
3a307ffc2 ocfs2: rework ocf... |
815 |
}; |
6af67d820 ocfs2: Use own sp... |
816 |
|
3a307ffc2 ocfs2: rework ocf... |
817 818 819 820 |
struct ocfs2_write_ctxt { /* Logical cluster position / len of write */ u32 w_cpos; u32 w_clen; |
6af67d820 ocfs2: Use own sp... |
821 |
|
e7432675f ocfs2: Initialize... |
822 823 |
/* First cluster allocated in a nonsparse extend */ u32 w_first_new_cpos; |
3a307ffc2 ocfs2: rework ocf... |
824 |
struct ocfs2_write_cluster_desc w_desc[OCFS2_MAX_CLUSTERS_PER_PAGE]; |
6af67d820 ocfs2: Use own sp... |
825 |
|
3a307ffc2 ocfs2: rework ocf... |
826 827 828 829 830 831 832 |
/* * 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; |
6af67d820 ocfs2: Use own sp... |
833 |
|
3a307ffc2 ocfs2: rework ocf... |
834 835 836 837 838 839 840 841 842 843 844 845 |
/* * 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. */ |
3a307ffc2 ocfs2: rework ocf... |
846 |
unsigned int w_num_pages; |
83fd9c7f6 Reorganize data e... |
847 |
struct page *w_pages[OCFS2_MAX_CTXT_PAGES]; |
3a307ffc2 ocfs2: rework ocf... |
848 |
struct page *w_target_page; |
eeb47d123 ocfs2: Fix invali... |
849 |
|
3a307ffc2 ocfs2: rework ocf... |
850 |
/* |
5cffff9e2 ocfs2: Fix ocfs2_... |
851 852 853 854 855 856 |
* 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; /* |
3a307ffc2 ocfs2: rework ocf... |
857 858 859 860 861 862 863 864 865 866 867 868 869 |
* 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; |
b27b7cbcf ocfs2: support wr... |
870 871 |
struct ocfs2_cached_dealloc_ctxt w_dealloc; |
3a307ffc2 ocfs2: rework ocf... |
872 |
}; |
1d410a6e3 ocfs2: Small refa... |
873 |
void ocfs2_unlock_and_free_pages(struct page **pages, int num_pages) |
3a307ffc2 ocfs2: rework ocf... |
874 875 |
{ int i; |
1d410a6e3 ocfs2: Small refa... |
876 877 878 879 880 881 |
for(i = 0; i < num_pages; i++) { if (pages[i]) { unlock_page(pages[i]); mark_page_accessed(pages[i]); page_cache_release(pages[i]); } |
6af67d820 ocfs2: Use own sp... |
882 |
} |
1d410a6e3 ocfs2: Small refa... |
883 884 885 886 |
} static void ocfs2_free_write_ctxt(struct ocfs2_write_ctxt *wc) { |
5cffff9e2 ocfs2: Fix ocfs2_... |
887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 |
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); page_cache_release(wc->w_target_page); } |
1d410a6e3 ocfs2: Small refa... |
905 |
ocfs2_unlock_and_free_pages(wc->w_pages, wc->w_num_pages); |
6af67d820 ocfs2: Use own sp... |
906 |
|
3a307ffc2 ocfs2: rework ocf... |
907 908 909 910 911 912 |
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, |
607d44aa3 ocfs2: factor out... |
913 |
unsigned len, struct buffer_head *di_bh) |
3a307ffc2 ocfs2: rework ocf... |
914 |
{ |
30b8548f2 [PATCH] ocfs2: Fi... |
915 |
u32 cend; |
3a307ffc2 ocfs2: rework ocf... |
916 917 918 919 920 |
struct ocfs2_write_ctxt *wc; wc = kzalloc(sizeof(struct ocfs2_write_ctxt), GFP_NOFS); if (!wc) return -ENOMEM; |
6af67d820 ocfs2: Use own sp... |
921 |
|
3a307ffc2 ocfs2: rework ocf... |
922 |
wc->w_cpos = pos >> osb->s_clustersize_bits; |
e7432675f ocfs2: Initialize... |
923 |
wc->w_first_new_cpos = UINT_MAX; |
30b8548f2 [PATCH] ocfs2: Fi... |
924 925 |
cend = (pos + len - 1) >> osb->s_clustersize_bits; wc->w_clen = cend - wc->w_cpos + 1; |
607d44aa3 ocfs2: factor out... |
926 927 |
get_bh(di_bh); wc->w_di_bh = di_bh; |
6af67d820 ocfs2: Use own sp... |
928 |
|
3a307ffc2 ocfs2: rework ocf... |
929 930 931 932 |
if (unlikely(PAGE_CACHE_SHIFT > osb->s_clustersize_bits)) wc->w_large_pages = 1; else wc->w_large_pages = 0; |
b27b7cbcf ocfs2: support wr... |
933 |
ocfs2_init_dealloc_ctxt(&wc->w_dealloc); |
3a307ffc2 ocfs2: rework ocf... |
934 |
*wcp = wc; |
6af67d820 ocfs2: Use own sp... |
935 |
|
3a307ffc2 ocfs2: rework ocf... |
936 |
return 0; |
6af67d820 ocfs2: Use own sp... |
937 938 939 |
} /* |
3a307ffc2 ocfs2: rework ocf... |
940 941 942 |
* 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. |
9517bac6c ocfs2: teach ocfs... |
943 |
*/ |
3a307ffc2 ocfs2: rework ocf... |
944 |
static void ocfs2_zero_new_buffers(struct page *page, unsigned from, unsigned to) |
9517bac6c ocfs2: teach ocfs... |
945 |
{ |
3a307ffc2 ocfs2: rework ocf... |
946 947 |
unsigned int block_start, block_end; struct buffer_head *head, *bh; |
9517bac6c ocfs2: teach ocfs... |
948 |
|
3a307ffc2 ocfs2: rework ocf... |
949 950 951 |
BUG_ON(!PageLocked(page)); if (!page_has_buffers(page)) return; |
9517bac6c ocfs2: teach ocfs... |
952 |
|
3a307ffc2 ocfs2: rework ocf... |
953 954 955 956 957 958 959 960 961 |
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; |
3a307ffc2 ocfs2: rework ocf... |
962 963 964 |
start = max(from, block_start); end = min(to, block_end); |
eebd2aa35 Pagecache zeroing... |
965 |
zero_user_segment(page, start, end); |
3a307ffc2 ocfs2: rework ocf... |
966 967 968 969 970 971 972 |
set_buffer_uptodate(bh); } clear_buffer_new(bh); mark_buffer_dirty(bh); } } |
9517bac6c ocfs2: teach ocfs... |
973 |
|
3a307ffc2 ocfs2: rework ocf... |
974 975 976 977 978 979 980 981 982 983 984 985 986 987 |
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; |
5c26a7b70 ocfs2: Don't doub... |
988 989 |
unsigned from = user_pos & (PAGE_CACHE_SIZE - 1), to = user_pos + user_len; |
3a307ffc2 ocfs2: rework ocf... |
990 |
struct page *tmppage; |
5c26a7b70 ocfs2: Don't doub... |
991 |
ocfs2_zero_new_buffers(wc->w_target_page, from, to); |
9517bac6c ocfs2: teach ocfs... |
992 |
|
3a307ffc2 ocfs2: rework ocf... |
993 994 |
for(i = 0; i < wc->w_num_pages; i++) { tmppage = wc->w_pages[i]; |
9517bac6c ocfs2: teach ocfs... |
995 |
|
961cecbee [PATCH] ocfs2: Fi... |
996 |
if (page_has_buffers(tmppage)) { |
53ef99cad ocfs2: Remove JBD... |
997 |
if (ocfs2_should_order_data(inode)) |
2b4e30fbd ocfs2: Switch ove... |
998 |
ocfs2_jbd2_file_inode(wc->w_handle, inode); |
961cecbee [PATCH] ocfs2: Fi... |
999 1000 1001 |
block_commit_write(tmppage, from, to); } |
9517bac6c ocfs2: teach ocfs... |
1002 |
} |
9517bac6c ocfs2: teach ocfs... |
1003 |
} |
3a307ffc2 ocfs2: rework ocf... |
1004 1005 1006 1007 1008 |
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) |
9517bac6c ocfs2: teach ocfs... |
1009 |
{ |
3a307ffc2 ocfs2: rework ocf... |
1010 1011 |
int ret; unsigned int map_from = 0, map_to = 0; |
9517bac6c ocfs2: teach ocfs... |
1012 |
unsigned int cluster_start, cluster_end; |
3a307ffc2 ocfs2: rework ocf... |
1013 |
unsigned int user_data_from = 0, user_data_to = 0; |
9517bac6c ocfs2: teach ocfs... |
1014 |
|
3a307ffc2 ocfs2: rework ocf... |
1015 |
ocfs2_figure_cluster_boundaries(OCFS2_SB(inode->i_sb), cpos, |
9517bac6c ocfs2: teach ocfs... |
1016 |
&cluster_start, &cluster_end); |
272b62c1f Treat writes as n... |
1017 1018 1019 1020 1021 |
/* 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)); |
3a307ffc2 ocfs2: rework ocf... |
1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 |
if (page == wc->w_target_page) { map_from = user_pos & (PAGE_CACHE_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) { |
9517bac6c ocfs2: teach ocfs... |
1034 1035 1036 |
mlog_errno(ret); goto out; } |
3a307ffc2 ocfs2: rework ocf... |
1037 1038 |
user_data_from = map_from; user_data_to = map_to; |
9517bac6c ocfs2: teach ocfs... |
1039 |
if (new) { |
3a307ffc2 ocfs2: rework ocf... |
1040 1041 |
map_from = cluster_start; map_to = cluster_end; |
9517bac6c ocfs2: teach ocfs... |
1042 1043 1044 1045 1046 1047 1048 1049 |
} } 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); |
3a307ffc2 ocfs2: rework ocf... |
1050 1051 |
map_from = cluster_start; map_to = cluster_end; |
9517bac6c ocfs2: teach ocfs... |
1052 1053 |
ret = ocfs2_map_page_blocks(page, p_blkno, inode, |
3a307ffc2 ocfs2: rework ocf... |
1054 |
cluster_start, cluster_end, new); |
9517bac6c ocfs2: teach ocfs... |
1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 |
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), |
3a307ffc2 ocfs2: rework ocf... |
1073 |
cpos, user_data_from, user_data_to); |
9517bac6c ocfs2: teach ocfs... |
1074 1075 |
flush_dcache_page(page); |
9517bac6c ocfs2: teach ocfs... |
1076 |
out: |
3a307ffc2 ocfs2: rework ocf... |
1077 |
return ret; |
9517bac6c ocfs2: teach ocfs... |
1078 1079 1080 |
} /* |
3a307ffc2 ocfs2: rework ocf... |
1081 |
* This function will only grab one clusters worth of pages. |
9517bac6c ocfs2: teach ocfs... |
1082 |
*/ |
3a307ffc2 ocfs2: rework ocf... |
1083 1084 |
static int ocfs2_grab_pages_for_write(struct address_space *mapping, struct ocfs2_write_ctxt *wc, |
693c241a5 ocfs2: No need to... |
1085 1086 |
u32 cpos, loff_t user_pos, unsigned user_len, int new, |
7307de805 ocfs2: shared wri... |
1087 |
struct page *mmap_page) |
9517bac6c ocfs2: teach ocfs... |
1088 |
{ |
3a307ffc2 ocfs2: rework ocf... |
1089 |
int ret = 0, i; |
693c241a5 ocfs2: No need to... |
1090 |
unsigned long start, target_index, end_index, index; |
9517bac6c ocfs2: teach ocfs... |
1091 |
struct inode *inode = mapping->host; |
693c241a5 ocfs2: No need to... |
1092 |
loff_t last_byte; |
9517bac6c ocfs2: teach ocfs... |
1093 |
|
3a307ffc2 ocfs2: rework ocf... |
1094 |
target_index = user_pos >> PAGE_CACHE_SHIFT; |
9517bac6c ocfs2: teach ocfs... |
1095 1096 1097 |
/* * Figure out how many pages we'll be manipulating here. For |
60b11392f ocfs2: zero tail ... |
1098 |
* non allocating write, we just change the one |
693c241a5 ocfs2: No need to... |
1099 1100 1101 |
* 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. |
9517bac6c ocfs2: teach ocfs... |
1102 |
*/ |
9517bac6c ocfs2: teach ocfs... |
1103 |
if (new) { |
3a307ffc2 ocfs2: rework ocf... |
1104 1105 |
wc->w_num_pages = ocfs2_pages_per_cluster(inode->i_sb); start = ocfs2_align_clusters_to_page_index(inode->i_sb, cpos); |
693c241a5 ocfs2: No need to... |
1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 |
/* * 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_CACHE_SHIFT) + 1; if ((start + wc->w_num_pages) > end_index) wc->w_num_pages = end_index - start; |
9517bac6c ocfs2: teach ocfs... |
1116 |
} else { |
3a307ffc2 ocfs2: rework ocf... |
1117 1118 |
wc->w_num_pages = 1; start = target_index; |
9517bac6c ocfs2: teach ocfs... |
1119 |
} |
3a307ffc2 ocfs2: rework ocf... |
1120 |
for(i = 0; i < wc->w_num_pages; i++) { |
9517bac6c ocfs2: teach ocfs... |
1121 |
index = start + i; |
7307de805 ocfs2: shared wri... |
1122 1123 1124 1125 1126 1127 1128 |
if (index == target_index && mmap_page) { /* * ocfs2_pagemkwrite() is a little different * and wants us to directly use the page * passed in. */ lock_page(mmap_page); |
5cffff9e2 ocfs2: Fix ocfs2_... |
1129 |
/* Exit and let the caller retry */ |
7307de805 ocfs2: shared wri... |
1130 |
if (mmap_page->mapping != mapping) { |
5cffff9e2 ocfs2: Fix ocfs2_... |
1131 |
WARN_ON(mmap_page->mapping); |
7307de805 ocfs2: shared wri... |
1132 |
unlock_page(mmap_page); |
5cffff9e2 ocfs2: Fix ocfs2_... |
1133 |
ret = -EAGAIN; |
7307de805 ocfs2: shared wri... |
1134 1135 1136 1137 1138 |
goto out; } page_cache_get(mmap_page); wc->w_pages[i] = mmap_page; |
5cffff9e2 ocfs2: Fix ocfs2_... |
1139 |
wc->w_target_locked = true; |
7307de805 ocfs2: shared wri... |
1140 1141 1142 1143 1144 1145 1146 1147 |
} 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; } |
9517bac6c ocfs2: teach ocfs... |
1148 |
} |
3a307ffc2 ocfs2: rework ocf... |
1149 1150 1151 |
if (index == target_index) wc->w_target_page = wc->w_pages[i]; |
9517bac6c ocfs2: teach ocfs... |
1152 |
} |
3a307ffc2 ocfs2: rework ocf... |
1153 |
out: |
5cffff9e2 ocfs2: Fix ocfs2_... |
1154 1155 |
if (ret) wc->w_target_locked = false; |
3a307ffc2 ocfs2: rework ocf... |
1156 1157 1158 1159 1160 1161 1162 |
return ret; } /* * Prepare a single cluster for write one cluster into the file. */ static int ocfs2_write_cluster(struct address_space *mapping, |
b27b7cbcf ocfs2: support wr... |
1163 |
u32 phys, unsigned int unwritten, |
e7432675f ocfs2: Initialize... |
1164 |
unsigned int should_zero, |
b27b7cbcf ocfs2: support wr... |
1165 |
struct ocfs2_alloc_context *data_ac, |
3a307ffc2 ocfs2: rework ocf... |
1166 1167 1168 1169 |
struct ocfs2_alloc_context *meta_ac, struct ocfs2_write_ctxt *wc, u32 cpos, loff_t user_pos, unsigned user_len) { |
e7432675f ocfs2: Initialize... |
1170 |
int ret, i, new; |
3a307ffc2 ocfs2: rework ocf... |
1171 1172 |
u64 v_blkno, p_blkno; struct inode *inode = mapping->host; |
f99b9b7cc ocfs2: Make ocfs2... |
1173 |
struct ocfs2_extent_tree et; |
3a307ffc2 ocfs2: rework ocf... |
1174 1175 |
new = phys == 0 ? 1 : 0; |
9517bac6c ocfs2: teach ocfs... |
1176 |
if (new) { |
3a307ffc2 ocfs2: rework ocf... |
1177 |
u32 tmp_pos; |
9517bac6c ocfs2: teach ocfs... |
1178 1179 1180 1181 |
/* * This is safe to call with the page locks - it won't take * any additional semaphores or cluster locks. */ |
3a307ffc2 ocfs2: rework ocf... |
1182 |
tmp_pos = cpos; |
0eb8d47e6 ocfs2: Make high ... |
1183 1184 1185 1186 |
ret = ocfs2_add_inode_data(OCFS2_SB(inode->i_sb), inode, &tmp_pos, 1, 0, wc->w_di_bh, wc->w_handle, data_ac, meta_ac, NULL); |
9517bac6c ocfs2: teach ocfs... |
1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 |
/* * 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. ", (unsigned long long)OCFS2_I(inode)->ip_blkno); if (ret < 0) { mlog_errno(ret); goto out; } |
b27b7cbcf ocfs2: support wr... |
1204 |
} else if (unwritten) { |
5e404e9ed ocfs2: Pass ocfs2... |
1205 1206 |
ocfs2_init_dinode_extent_tree(&et, INODE_CACHE(inode), wc->w_di_bh); |
f99b9b7cc ocfs2: Make ocfs2... |
1207 |
ret = ocfs2_mark_extent_written(inode, &et, |
b27b7cbcf ocfs2: support wr... |
1208 |
wc->w_handle, cpos, 1, phys, |
f99b9b7cc ocfs2: Make ocfs2... |
1209 |
meta_ac, &wc->w_dealloc); |
b27b7cbcf ocfs2: support wr... |
1210 1211 1212 1213 1214 |
if (ret < 0) { mlog_errno(ret); goto out; } } |
3a307ffc2 ocfs2: rework ocf... |
1215 |
|
b27b7cbcf ocfs2: support wr... |
1216 |
if (should_zero) |
3a307ffc2 ocfs2: rework ocf... |
1217 |
v_blkno = ocfs2_clusters_to_blocks(inode->i_sb, cpos); |
b27b7cbcf ocfs2: support wr... |
1218 |
else |
3a307ffc2 ocfs2: rework ocf... |
1219 |
v_blkno = user_pos >> inode->i_sb->s_blocksize_bits; |
9517bac6c ocfs2: teach ocfs... |
1220 |
|
3a307ffc2 ocfs2: rework ocf... |
1221 1222 1223 1224 |
/* * The only reason this should fail is due to an inability to * find the extent added. */ |
49cb8d2d4 ocfs2: Read from ... |
1225 1226 |
ret = ocfs2_extent_map_get_blocks(inode, v_blkno, &p_blkno, NULL, NULL); |
9517bac6c ocfs2: teach ocfs... |
1227 |
if (ret < 0) { |
3a307ffc2 ocfs2: rework ocf... |
1228 1229 1230 1231 |
ocfs2_error(inode->i_sb, "Corrupting extend for inode %llu, " "at logical block %llu", (unsigned long long)OCFS2_I(inode)->ip_blkno, (unsigned long long)v_blkno); |
9517bac6c ocfs2: teach ocfs... |
1232 1233 1234 1235 |
goto out; } BUG_ON(p_blkno == 0); |
3a307ffc2 ocfs2: rework ocf... |
1236 1237 |
for(i = 0; i < wc->w_num_pages; i++) { int tmpret; |
9517bac6c ocfs2: teach ocfs... |
1238 |
|
3a307ffc2 ocfs2: rework ocf... |
1239 1240 |
tmpret = ocfs2_prepare_page_for_write(inode, &p_blkno, wc, wc->w_pages[i], cpos, |
b27b7cbcf ocfs2: support wr... |
1241 1242 |
user_pos, user_len, should_zero); |
3a307ffc2 ocfs2: rework ocf... |
1243 1244 1245 |
if (tmpret) { mlog_errno(tmpret); if (ret == 0) |
cbfa9639a ocfs2: Fix error ... |
1246 |
ret = tmpret; |
3a307ffc2 ocfs2: rework ocf... |
1247 |
} |
9517bac6c ocfs2: teach ocfs... |
1248 |
} |
3a307ffc2 ocfs2: rework ocf... |
1249 1250 1251 1252 1253 |
/* * We only have cleanup to do in case of allocating write. */ if (ret && new) ocfs2_write_failure(inode, wc, user_pos, user_len); |
9517bac6c ocfs2: teach ocfs... |
1254 |
out: |
9517bac6c ocfs2: teach ocfs... |
1255 |
|
3a307ffc2 ocfs2: rework ocf... |
1256 |
return ret; |
9517bac6c ocfs2: teach ocfs... |
1257 |
} |
0d172baa5 ocfs2: small clea... |
1258 1259 1260 1261 1262 1263 1264 |
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; |
db56246c6 ocfs2: Fix pos/le... |
1265 1266 |
loff_t cluster_off; unsigned int local_len = len; |
0d172baa5 ocfs2: small clea... |
1267 |
struct ocfs2_write_cluster_desc *desc; |
db56246c6 ocfs2: Fix pos/le... |
1268 |
struct ocfs2_super *osb = OCFS2_SB(mapping->host->i_sb); |
0d172baa5 ocfs2: small clea... |
1269 1270 1271 |
for (i = 0; i < wc->w_clen; i++) { desc = &wc->w_desc[i]; |
db56246c6 ocfs2: Fix pos/le... |
1272 1273 1274 1275 1276 1277 1278 1279 |
/* * 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; |
b27b7cbcf ocfs2: support wr... |
1280 |
ret = ocfs2_write_cluster(mapping, desc->c_phys, |
e7432675f ocfs2: Initialize... |
1281 1282 1283 |
desc->c_unwritten, desc->c_needs_zero, data_ac, meta_ac, |
db56246c6 ocfs2: Fix pos/le... |
1284 |
wc, desc->c_cpos, pos, local_len); |
0d172baa5 ocfs2: small clea... |
1285 1286 1287 1288 |
if (ret) { mlog_errno(ret); goto out; } |
db56246c6 ocfs2: Fix pos/le... |
1289 1290 1291 |
len -= local_len; pos += local_len; |
0d172baa5 ocfs2: small clea... |
1292 1293 1294 1295 1296 1297 |
} ret = 0; out: return ret; } |
3a307ffc2 ocfs2: rework ocf... |
1298 1299 1300 1301 1302 1303 1304 1305 |
/* * 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) |
9517bac6c ocfs2: teach ocfs... |
1306 |
{ |
3a307ffc2 ocfs2: rework ocf... |
1307 |
struct ocfs2_write_cluster_desc *desc; |
9517bac6c ocfs2: teach ocfs... |
1308 |
|
3a307ffc2 ocfs2: rework ocf... |
1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 |
wc->w_target_from = pos & (PAGE_CACHE_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. */ |
9517bac6c ocfs2: teach ocfs... |
1323 |
|
3a307ffc2 ocfs2: rework ocf... |
1324 1325 1326 |
if (wc->w_large_pages) { /* * We only care about the 1st and last cluster within |
b27b7cbcf ocfs2: support wr... |
1327 |
* our range and whether they should be zero'd or not. Either |
3a307ffc2 ocfs2: rework ocf... |
1328 1329 1330 1331 |
* value may be extended out to the start/end of a * newly allocated cluster. */ desc = &wc->w_desc[0]; |
e7432675f ocfs2: Initialize... |
1332 |
if (desc->c_needs_zero) |
3a307ffc2 ocfs2: rework ocf... |
1333 1334 1335 1336 1337 1338 |
ocfs2_figure_cluster_boundaries(osb, desc->c_cpos, &wc->w_target_from, NULL); desc = &wc->w_desc[wc->w_clen - 1]; |
e7432675f ocfs2: Initialize... |
1339 |
if (desc->c_needs_zero) |
3a307ffc2 ocfs2: rework ocf... |
1340 1341 1342 1343 1344 1345 1346 1347 |
ocfs2_figure_cluster_boundaries(osb, desc->c_cpos, NULL, &wc->w_target_to); } else { wc->w_target_from = 0; wc->w_target_to = PAGE_CACHE_SIZE; } |
9517bac6c ocfs2: teach ocfs... |
1348 |
} |
0d172baa5 ocfs2: small clea... |
1349 1350 1351 |
/* * Populate each single-cluster write descriptor in the write context * with information about the i/o to be done. |
b27b7cbcf ocfs2: support wr... |
1352 1353 1354 1355 |
* * 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. |
0d172baa5 ocfs2: small clea... |
1356 1357 1358 |
*/ static int ocfs2_populate_write_desc(struct inode *inode, struct ocfs2_write_ctxt *wc, |
b27b7cbcf ocfs2: support wr... |
1359 1360 |
unsigned int *clusters_to_alloc, unsigned int *extents_to_split) |
9517bac6c ocfs2: teach ocfs... |
1361 |
{ |
0d172baa5 ocfs2: small clea... |
1362 |
int ret; |
3a307ffc2 ocfs2: rework ocf... |
1363 |
struct ocfs2_write_cluster_desc *desc; |
0d172baa5 ocfs2: small clea... |
1364 |
unsigned int num_clusters = 0; |
b27b7cbcf ocfs2: support wr... |
1365 |
unsigned int ext_flags = 0; |
0d172baa5 ocfs2: small clea... |
1366 1367 |
u32 phys = 0; int i; |
9517bac6c ocfs2: teach ocfs... |
1368 |
|
b27b7cbcf ocfs2: support wr... |
1369 1370 |
*clusters_to_alloc = 0; *extents_to_split = 0; |
3a307ffc2 ocfs2: rework ocf... |
1371 1372 1373 1374 1375 |
for (i = 0; i < wc->w_clen; i++) { desc = &wc->w_desc[i]; desc->c_cpos = wc->w_cpos + i; if (num_clusters == 0) { |
b27b7cbcf ocfs2: support wr... |
1376 1377 1378 |
/* * Need to look up the next extent record. */ |
3a307ffc2 ocfs2: rework ocf... |
1379 |
ret = ocfs2_get_clusters(inode, desc->c_cpos, &phys, |
b27b7cbcf ocfs2: support wr... |
1380 |
&num_clusters, &ext_flags); |
3a307ffc2 ocfs2: rework ocf... |
1381 1382 |
if (ret) { mlog_errno(ret); |
607d44aa3 ocfs2: factor out... |
1383 |
goto out; |
3a307ffc2 ocfs2: rework ocf... |
1384 |
} |
b27b7cbcf ocfs2: support wr... |
1385 |
|
293b2f70b ocfs2: Integrate ... |
1386 1387 |
/* We should already CoW the refcountd extent. */ BUG_ON(ext_flags & OCFS2_EXT_REFCOUNTED); |
b27b7cbcf ocfs2: support wr... |
1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 |
/* * 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; |
3a307ffc2 ocfs2: rework ocf... |
1399 1400 1401 1402 1403 1404 1405 |
} else if (phys) { /* * Only increment phys if it doesn't describe * a hole. */ phys++; } |
e7432675f ocfs2: Initialize... |
1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 |
/* * 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; } |
3a307ffc2 ocfs2: rework ocf... |
1416 1417 1418 |
desc->c_phys = phys; if (phys == 0) { desc->c_new = 1; |
e7432675f ocfs2: Initialize... |
1419 |
desc->c_needs_zero = 1; |
0d172baa5 ocfs2: small clea... |
1420 |
*clusters_to_alloc = *clusters_to_alloc + 1; |
3a307ffc2 ocfs2: rework ocf... |
1421 |
} |
e7432675f ocfs2: Initialize... |
1422 1423 |
if (ext_flags & OCFS2_EXT_UNWRITTEN) { |
b27b7cbcf ocfs2: support wr... |
1424 |
desc->c_unwritten = 1; |
e7432675f ocfs2: Initialize... |
1425 1426 |
desc->c_needs_zero = 1; } |
3a307ffc2 ocfs2: rework ocf... |
1427 1428 |
num_clusters--; |
9517bac6c ocfs2: teach ocfs... |
1429 |
} |
0d172baa5 ocfs2: small clea... |
1430 1431 1432 1433 |
ret = 0; out: return ret; } |
1afc32b95 ocfs2: Write supp... |
1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 |
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; page = find_or_create_page(mapping, 0, GFP_NOFS); if (!page) { 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; handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS); if (IS_ERR(handle)) { ret = PTR_ERR(handle); mlog_errno(ret); goto out; } |
0cf2f7632 ocfs2: Pass struc... |
1463 |
ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), wc->w_di_bh, |
13723d00e ocfs2: Use metada... |
1464 |
OCFS2_JOURNAL_ACCESS_WRITE); |
1afc32b95 ocfs2: Write supp... |
1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 |
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; |
0d8a4e0cd ocfs2: Fix compar... |
1492 |
if (new_size <= le16_to_cpu(di->id2.i_data.id_count)) |
1afc32b95 ocfs2: Write supp... |
1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 |
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); |
d9ae49d6e ocfs2: tweak to g... |
1505 |
struct ocfs2_dinode *di = NULL; |
1afc32b95 ocfs2: Write supp... |
1506 |
|
9558156bc ocfs2: Remove mlo... |
1507 1508 1509 |
trace_ocfs2_try_to_write_inline_data((unsigned long long)oi->ip_blkno, len, (unsigned long long)pos, oi->ip_dyn_features); |
1afc32b95 ocfs2: Write supp... |
1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 |
/* * 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. */ |
d9ae49d6e ocfs2: tweak to g... |
1538 1539 1540 |
di = (struct ocfs2_dinode *)wc->w_di_bh->b_data; if (mmap_page || end > ocfs2_max_inline_data_with_xattr(inode->i_sb, di)) |
1afc32b95 ocfs2: Write supp... |
1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 |
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; } |
65ed39d6c ocfs2: move nonsp... |
1558 1559 1560 1561 1562 1563 1564 1565 1566 |
/* * 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. */ |
5693486ba ocfs2: Zero the t... |
1567 1568 1569 |
static int ocfs2_expand_nonsparse_inode(struct inode *inode, struct buffer_head *di_bh, loff_t pos, unsigned len, |
65ed39d6c ocfs2: move nonsp... |
1570 1571 1572 |
struct ocfs2_write_ctxt *wc) { int ret; |
65ed39d6c ocfs2: move nonsp... |
1573 |
loff_t newsize = pos + len; |
5693486ba ocfs2: Zero the t... |
1574 |
BUG_ON(ocfs2_sparse_alloc(OCFS2_SB(inode->i_sb))); |
65ed39d6c ocfs2: move nonsp... |
1575 1576 1577 |
if (newsize <= i_size_read(inode)) return 0; |
5693486ba ocfs2: Zero the t... |
1578 |
ret = ocfs2_extend_no_holes(inode, di_bh, newsize, pos); |
65ed39d6c ocfs2: move nonsp... |
1579 1580 |
if (ret) mlog_errno(ret); |
e7432675f ocfs2: Initialize... |
1581 1582 |
wc->w_first_new_cpos = ocfs2_clusters_for_bytes(inode->i_sb, i_size_read(inode)); |
65ed39d6c ocfs2: move nonsp... |
1583 1584 |
return ret; } |
5693486ba ocfs2: Zero the t... |
1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 |
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; } |
50308d813 ocfs2: Try to fre... |
1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 |
/* * Try to flush truncate logs if we can free enough clusters from it. * As for return value, "< 0" means error, "0" no space and "1" means * we have freed enough spaces and let the caller try to allocate again. */ static int ocfs2_try_to_free_truncate_log(struct ocfs2_super *osb, unsigned int needed) { tid_t target; int ret = 0; unsigned int truncated_clusters; mutex_lock(&osb->osb_tl_inode->i_mutex); truncated_clusters = osb->truncated_clusters; mutex_unlock(&osb->osb_tl_inode->i_mutex); /* * Check whether we can succeed in allocating if we free * the truncate log. */ if (truncated_clusters < needed) goto out; ret = ocfs2_flush_truncate_log(osb); if (ret) { mlog_errno(ret); goto out; } if (jbd2_journal_start_commit(osb->journal->j_journal, &target)) { jbd2_log_wait_commit(osb->journal->j_journal, target); ret = 1; } out: return ret; } |
0378da0fd ocfs2: pass struc... |
1632 1633 |
int ocfs2_write_begin_nolock(struct file *filp, struct address_space *mapping, |
0d172baa5 ocfs2: small clea... |
1634 1635 1636 1637 |
loff_t pos, unsigned len, unsigned flags, struct page **pagep, void **fsdata, struct buffer_head *di_bh, struct page *mmap_page) { |
e7432675f ocfs2: Initialize... |
1638 |
int ret, cluster_of_pages, credits = OCFS2_INODE_UPDATE_CREDITS; |
50308d813 ocfs2: Try to fre... |
1639 |
unsigned int clusters_to_alloc, extents_to_split, clusters_need = 0; |
0d172baa5 ocfs2: small clea... |
1640 1641 1642 1643 1644 1645 1646 |
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; |
f99b9b7cc ocfs2: Make ocfs2... |
1647 |
struct ocfs2_extent_tree et; |
50308d813 ocfs2: Try to fre... |
1648 |
int try_free = 1, ret1; |
0d172baa5 ocfs2: small clea... |
1649 |
|
50308d813 ocfs2: Try to fre... |
1650 |
try_again: |
0d172baa5 ocfs2: small clea... |
1651 1652 1653 1654 1655 |
ret = ocfs2_alloc_write_ctxt(&wc, osb, pos, len, di_bh); if (ret) { mlog_errno(ret); return ret; } |
1afc32b95 ocfs2: Write supp... |
1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 |
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; } } |
5693486ba ocfs2: Zero the t... |
1668 1669 1670 1671 1672 |
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); |
65ed39d6c ocfs2: move nonsp... |
1673 1674 1675 1676 |
if (ret) { mlog_errno(ret); goto out; } |
293b2f70b ocfs2: Integrate ... |
1677 1678 1679 1680 1681 |
ret = ocfs2_check_range_for_refcount(inode, pos, len); if (ret < 0) { mlog_errno(ret); goto out; } else if (ret == 1) { |
50308d813 ocfs2: Try to fre... |
1682 |
clusters_need = wc->w_clen; |
155027121 ocfs2: Add struct... |
1683 |
ret = ocfs2_refcount_cow(inode, filp, di_bh, |
37f8a2bfa ocfs2: CoW a refl... |
1684 |
wc->w_cpos, wc->w_clen, UINT_MAX); |
293b2f70b ocfs2: Integrate ... |
1685 1686 1687 1688 1689 |
if (ret) { mlog_errno(ret); goto out; } } |
b27b7cbcf ocfs2: support wr... |
1690 1691 |
ret = ocfs2_populate_write_desc(inode, wc, &clusters_to_alloc, &extents_to_split); |
0d172baa5 ocfs2: small clea... |
1692 1693 1694 1695 |
if (ret) { mlog_errno(ret); goto out; } |
50308d813 ocfs2: Try to fre... |
1696 |
clusters_need += clusters_to_alloc; |
0d172baa5 ocfs2: small clea... |
1697 1698 |
di = (struct ocfs2_dinode *)wc->w_di_bh->b_data; |
9558156bc ocfs2: Remove mlo... |
1699 1700 1701 1702 1703 1704 |
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, flags, mmap_page, clusters_to_alloc, extents_to_split); |
3a307ffc2 ocfs2: rework ocf... |
1705 1706 1707 1708 1709 1710 |
/* * 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. */ |
b27b7cbcf ocfs2: support wr... |
1711 |
if (clusters_to_alloc || extents_to_split) { |
3a307ffc2 ocfs2: rework ocf... |
1712 1713 |
/* * XXX: We are stretching the limits of |
b27b7cbcf ocfs2: support wr... |
1714 |
* ocfs2_lock_allocators(). It greatly over-estimates |
3a307ffc2 ocfs2: rework ocf... |
1715 1716 |
* the work to be done. */ |
5e404e9ed ocfs2: Pass ocfs2... |
1717 1718 |
ocfs2_init_dinode_extent_tree(&et, INODE_CACHE(inode), wc->w_di_bh); |
f99b9b7cc ocfs2: Make ocfs2... |
1719 |
ret = ocfs2_lock_allocators(inode, &et, |
231b87d10 ocfs2: Modify ocf... |
1720 |
clusters_to_alloc, extents_to_split, |
f99b9b7cc ocfs2: Make ocfs2... |
1721 |
&data_ac, &meta_ac); |
9517bac6c ocfs2: teach ocfs... |
1722 1723 |
if (ret) { mlog_errno(ret); |
607d44aa3 ocfs2: factor out... |
1724 |
goto out; |
9517bac6c ocfs2: teach ocfs... |
1725 |
} |
4fe370afa ocfs2: use alloca... |
1726 1727 |
if (data_ac) data_ac->ac_resv = &OCFS2_I(inode)->ip_la_data_resv; |
811f933df ocfs2: Use ocfs2_... |
1728 1729 |
credits = ocfs2_calc_extend_credits(inode->i_sb, &di->id2.i_list, |
3a307ffc2 ocfs2: rework ocf... |
1730 |
clusters_to_alloc); |
9517bac6c ocfs2: teach ocfs... |
1731 |
} |
e7432675f ocfs2: Initialize... |
1732 1733 1734 1735 1736 1737 |
/* * 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 (clusters_to_alloc || extents_to_split || |
8379e7c46 ocfs2: ocfs2_writ... |
1738 1739 |
(wc->w_clen && (wc->w_desc[0].c_needs_zero || wc->w_desc[wc->w_clen - 1].c_needs_zero))) |
e7432675f ocfs2: Initialize... |
1740 1741 1742 1743 1744 |
cluster_of_pages = 1; else cluster_of_pages = 0; ocfs2_set_target_boundaries(osb, wc, pos, len, cluster_of_pages); |
3a307ffc2 ocfs2: rework ocf... |
1745 |
|
9517bac6c ocfs2: teach ocfs... |
1746 1747 1748 1749 |
handle = ocfs2_start_trans(osb, credits); if (IS_ERR(handle)) { ret = PTR_ERR(handle); mlog_errno(ret); |
607d44aa3 ocfs2: factor out... |
1750 |
goto out; |
9517bac6c ocfs2: teach ocfs... |
1751 |
} |
3a307ffc2 ocfs2: rework ocf... |
1752 |
wc->w_handle = handle; |
5dd4056db dquot: cleanup sp... |
1753 1754 1755 1756 1757 |
if (clusters_to_alloc) { ret = dquot_alloc_space_nodirty(inode, ocfs2_clusters_to_bytes(osb->sb, clusters_to_alloc)); if (ret) goto out_commit; |
a90714c15 ocfs2: Add quota ... |
1758 |
} |
3a307ffc2 ocfs2: rework ocf... |
1759 1760 1761 1762 |
/* * We don't want this to fail in ocfs2_write_end(), so do it * here. */ |
0cf2f7632 ocfs2: Pass struc... |
1763 |
ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), wc->w_di_bh, |
13723d00e ocfs2: Use metada... |
1764 |
OCFS2_JOURNAL_ACCESS_WRITE); |
3a307ffc2 ocfs2: rework ocf... |
1765 |
if (ret) { |
9517bac6c ocfs2: teach ocfs... |
1766 |
mlog_errno(ret); |
a90714c15 ocfs2: Add quota ... |
1767 |
goto out_quota; |
9517bac6c ocfs2: teach ocfs... |
1768 |
} |
3a307ffc2 ocfs2: rework ocf... |
1769 1770 1771 1772 1773 |
/* * 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. */ |
693c241a5 ocfs2: No need to... |
1774 |
ret = ocfs2_grab_pages_for_write(mapping, wc, wc->w_cpos, pos, len, |
e7432675f ocfs2: Initialize... |
1775 |
cluster_of_pages, mmap_page); |
5cffff9e2 ocfs2: Fix ocfs2_... |
1776 |
if (ret && ret != -EAGAIN) { |
9517bac6c ocfs2: teach ocfs... |
1777 |
mlog_errno(ret); |
a90714c15 ocfs2: Add quota ... |
1778 |
goto out_quota; |
9517bac6c ocfs2: teach ocfs... |
1779 |
} |
5cffff9e2 ocfs2: Fix ocfs2_... |
1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 |
/* * ocfs2_grab_pages_for_write() returns -EAGAIN if it could not lock * the target page. In this case, we exit with no error and no target * page. This will trigger the caller, page_mkwrite(), to re-try * the operation. */ if (ret == -EAGAIN) { BUG_ON(wc->w_target_page); ret = 0; goto out_quota; } |
0d172baa5 ocfs2: small clea... |
1791 1792 1793 1794 |
ret = ocfs2_write_cluster_by_desc(mapping, data_ac, meta_ac, wc, pos, len); if (ret) { mlog_errno(ret); |
a90714c15 ocfs2: Add quota ... |
1795 |
goto out_quota; |
9517bac6c ocfs2: teach ocfs... |
1796 |
} |
9517bac6c ocfs2: teach ocfs... |
1797 |
|
3a307ffc2 ocfs2: rework ocf... |
1798 1799 1800 1801 |
if (data_ac) ocfs2_free_alloc_context(data_ac); if (meta_ac) ocfs2_free_alloc_context(meta_ac); |
9517bac6c ocfs2: teach ocfs... |
1802 |
|
1afc32b95 ocfs2: Write supp... |
1803 |
success: |
3a307ffc2 ocfs2: rework ocf... |
1804 1805 1806 |
*pagep = wc->w_target_page; *fsdata = wc; return 0; |
a90714c15 ocfs2: Add quota ... |
1807 1808 |
out_quota: if (clusters_to_alloc) |
5dd4056db dquot: cleanup sp... |
1809 |
dquot_free_space(inode, |
a90714c15 ocfs2: Add quota ... |
1810 |
ocfs2_clusters_to_bytes(osb->sb, clusters_to_alloc)); |
9517bac6c ocfs2: teach ocfs... |
1811 1812 |
out_commit: ocfs2_commit_trans(osb, handle); |
9517bac6c ocfs2: teach ocfs... |
1813 |
out: |
3a307ffc2 ocfs2: rework ocf... |
1814 |
ocfs2_free_write_ctxt(wc); |
9517bac6c ocfs2: teach ocfs... |
1815 1816 1817 1818 |
if (data_ac) ocfs2_free_alloc_context(data_ac); if (meta_ac) ocfs2_free_alloc_context(meta_ac); |
50308d813 ocfs2: Try to fre... |
1819 1820 1821 1822 1823 1824 1825 1826 1827 1828 1829 1830 1831 1832 1833 |
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); } |
3a307ffc2 ocfs2: rework ocf... |
1834 1835 |
return ret; } |
b6af1bcd8 ocfs2: convert to... |
1836 1837 1838 |
static int ocfs2_write_begin(struct file *file, struct address_space *mapping, loff_t pos, unsigned len, unsigned flags, struct page **pagep, void **fsdata) |
607d44aa3 ocfs2: factor out... |
1839 1840 1841 1842 |
{ int ret; struct buffer_head *di_bh = NULL; struct inode *inode = mapping->host; |
e63aecb65 ocfs2: Rename ocf... |
1843 |
ret = ocfs2_inode_lock(inode, &di_bh, 1); |
607d44aa3 ocfs2: factor out... |
1844 1845 1846 1847 1848 1849 1850 1851 1852 1853 1854 1855 1856 |
if (ret) { mlog_errno(ret); return ret; } /* * Take alloc sem here to prevent concurrent lookups. That way * the mapping, zeroing and tree manipulation within * ocfs2_write() will be safe against ->readpage(). This * should also serve to lock out allocation from a shared * writeable region. */ down_write(&OCFS2_I(inode)->ip_alloc_sem); |
0378da0fd ocfs2: pass struc... |
1857 |
ret = ocfs2_write_begin_nolock(file, mapping, pos, len, flags, pagep, |
7307de805 ocfs2: shared wri... |
1858 |
fsdata, di_bh, NULL); |
607d44aa3 ocfs2: factor out... |
1859 1860 |
if (ret) { mlog_errno(ret); |
c934a92d0 ocfs2: Remove dat... |
1861 |
goto out_fail; |
607d44aa3 ocfs2: factor out... |
1862 1863 1864 1865 1866 |
} brelse(di_bh); return 0; |
607d44aa3 ocfs2: factor out... |
1867 1868 1869 1870 |
out_fail: up_write(&OCFS2_I(inode)->ip_alloc_sem); brelse(di_bh); |
e63aecb65 ocfs2: Rename ocf... |
1871 |
ocfs2_inode_unlock(inode, 1); |
607d44aa3 ocfs2: factor out... |
1872 1873 1874 |
return ret; } |
1afc32b95 ocfs2: Write supp... |
1875 1876 1877 1878 1879 1880 1881 1882 1883 1884 1885 1886 1887 1888 1889 1890 1891 |
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, KM_USER0); memcpy(di->id2.i_data.id_data + pos, kaddr + pos, *copied); kunmap_atomic(kaddr, KM_USER0); |
9558156bc ocfs2: Remove mlo... |
1892 1893 |
trace_ocfs2_write_end_inline( (unsigned long long)OCFS2_I(inode)->ip_blkno, |
1afc32b95 ocfs2: Write supp... |
1894 1895 1896 1897 |
(unsigned long long)pos, *copied, le16_to_cpu(di->id2.i_data.id_count), le16_to_cpu(di->i_dyn_features)); } |
7307de805 ocfs2: shared wri... |
1898 1899 1900 |
int ocfs2_write_end_nolock(struct address_space *mapping, loff_t pos, unsigned len, unsigned copied, struct page *page, void *fsdata) |
3a307ffc2 ocfs2: rework ocf... |
1901 1902 1903 1904 1905 1906 1907 1908 1909 |
{ int i; unsigned from, to, start = pos & (PAGE_CACHE_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; |
1afc32b95 ocfs2: Write supp... |
1910 1911 1912 1913 |
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; } |
3a307ffc2 ocfs2: rework ocf... |
1914 1915 1916 1917 1918 1919 1920 1921 1922 1923 1924 1925 1926 1927 1928 1929 1930 1931 1932 1933 1934 1935 1936 1937 1938 1939 1940 1941 |
if (unlikely(copied < len)) { if (!PageUptodate(wc->w_target_page)) copied = 0; ocfs2_zero_new_buffers(wc->w_target_page, start+copied, start+len); } flush_dcache_page(wc->w_target_page); for(i = 0; i < wc->w_num_pages; i++) { tmppage = wc->w_pages[i]; if (tmppage == wc->w_target_page) { from = wc->w_target_from; to = wc->w_target_to; BUG_ON(from > PAGE_CACHE_SIZE || to > PAGE_CACHE_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_CACHE_SIZE; } |
961cecbee [PATCH] ocfs2: Fi... |
1942 |
if (page_has_buffers(tmppage)) { |
53ef99cad ocfs2: Remove JBD... |
1943 |
if (ocfs2_should_order_data(inode)) |
2b4e30fbd ocfs2: Switch ove... |
1944 |
ocfs2_jbd2_file_inode(wc->w_handle, inode); |
961cecbee [PATCH] ocfs2: Fi... |
1945 1946 |
block_commit_write(tmppage, from, to); } |
3a307ffc2 ocfs2: rework ocf... |
1947 |
} |
1afc32b95 ocfs2: Write supp... |
1948 |
out_write_size: |
3a307ffc2 ocfs2: rework ocf... |
1949 1950 1951 1952 1953 1954 1955 1956 1957 1958 |
pos += copied; if (pos > inode->i_size) { 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; 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); |
3a307ffc2 ocfs2: rework ocf... |
1959 1960 1961 |
ocfs2_journal_dirty(handle, wc->w_di_bh); ocfs2_commit_trans(osb, handle); |
59a5e416d ocfs2: plug trunc... |
1962 |
|
b27b7cbcf ocfs2: support wr... |
1963 |
ocfs2_run_deallocs(osb, &wc->w_dealloc); |
607d44aa3 ocfs2: factor out... |
1964 1965 1966 1967 |
ocfs2_free_write_ctxt(wc); return copied; } |
b6af1bcd8 ocfs2: convert to... |
1968 1969 1970 |
static int ocfs2_write_end(struct file *file, struct address_space *mapping, loff_t pos, unsigned len, unsigned copied, struct page *page, void *fsdata) |
607d44aa3 ocfs2: factor out... |
1971 1972 1973 1974 1975 |
{ int ret; struct inode *inode = mapping->host; ret = ocfs2_write_end_nolock(mapping, pos, len, copied, page, fsdata); |
3a307ffc2 ocfs2: rework ocf... |
1976 |
up_write(&OCFS2_I(inode)->ip_alloc_sem); |
e63aecb65 ocfs2: Rename ocf... |
1977 |
ocfs2_inode_unlock(inode, 1); |
9517bac6c ocfs2: teach ocfs... |
1978 |
|
607d44aa3 ocfs2: factor out... |
1979 |
return ret; |
9517bac6c ocfs2: teach ocfs... |
1980 |
} |
f5e54d6e5 [PATCH] mark addr... |
1981 |
const struct address_space_operations ocfs2_aops = { |
1fca3a05e ocfs2: Pagecache ... |
1982 1983 1984 1985 1986 1987 |
.readpage = ocfs2_readpage, .readpages = ocfs2_readpages, .writepage = ocfs2_writepage, .write_begin = ocfs2_write_begin, .write_end = ocfs2_write_end, .bmap = ocfs2_bmap, |
1fca3a05e ocfs2: Pagecache ... |
1988 1989 1990 1991 1992 |
.direct_IO = ocfs2_direct_IO, .invalidatepage = ocfs2_invalidatepage, .releasepage = ocfs2_releasepage, .migratepage = buffer_migrate_page, .is_partially_uptodate = block_is_partially_uptodate, |
aa261f549 HWPOISON: Enable ... |
1993 |
.error_remove_page = generic_error_remove_page, |
ccd979bdb [PATCH] OCFS2: Th... |
1994 |
}; |