| /* -*- mode: c; c-basic-offset: 8; -*- |
| * vim: noexpandtab sw=8 ts=8 sts=0: |
| * |
| * file.c |
| * |
| * File open, close, extend, truncate |
| * |
| * 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/capability.h> |
| #include <linux/fs.h> |
| #include <linux/types.h> |
| #include <linux/slab.h> |
| #include <linux/highmem.h> |
| #include <linux/pagemap.h> |
| #include <linux/uio.h> |
| #include <linux/sched.h> |
| |
| #define MLOG_MASK_PREFIX ML_INODE |
| #include <cluster/masklog.h> |
| |
| #include "ocfs2.h" |
| |
| #include "alloc.h" |
| #include "aops.h" |
| #include "dir.h" |
| #include "dlmglue.h" |
| #include "extent_map.h" |
| #include "file.h" |
| #include "sysfile.h" |
| #include "inode.h" |
| #include "ioctl.h" |
| #include "journal.h" |
| #include "mmap.h" |
| #include "suballoc.h" |
| #include "super.h" |
| |
| #include "buffer_head_io.h" |
| |
| static int ocfs2_sync_inode(struct inode *inode) |
| { |
| filemap_fdatawrite(inode->i_mapping); |
| return sync_mapping_buffers(inode->i_mapping); |
| } |
| |
| static int ocfs2_file_open(struct inode *inode, struct file *file) |
| { |
| int status; |
| int mode = file->f_flags; |
| struct ocfs2_inode_info *oi = OCFS2_I(inode); |
| |
| mlog_entry("(0x%p, 0x%p, '%.*s')\n", inode, file, |
| file->f_dentry->d_name.len, file->f_dentry->d_name.name); |
| |
| spin_lock(&oi->ip_lock); |
| |
| /* Check that the inode hasn't been wiped from disk by another |
| * node. If it hasn't then we're safe as long as we hold the |
| * spin lock until our increment of open count. */ |
| if (OCFS2_I(inode)->ip_flags & OCFS2_INODE_DELETED) { |
| spin_unlock(&oi->ip_lock); |
| |
| status = -ENOENT; |
| goto leave; |
| } |
| |
| if (mode & O_DIRECT) |
| oi->ip_flags |= OCFS2_INODE_OPEN_DIRECT; |
| |
| oi->ip_open_count++; |
| spin_unlock(&oi->ip_lock); |
| status = 0; |
| leave: |
| mlog_exit(status); |
| return status; |
| } |
| |
| static int ocfs2_file_release(struct inode *inode, struct file *file) |
| { |
| struct ocfs2_inode_info *oi = OCFS2_I(inode); |
| |
| mlog_entry("(0x%p, 0x%p, '%.*s')\n", inode, file, |
| file->f_dentry->d_name.len, |
| file->f_dentry->d_name.name); |
| |
| spin_lock(&oi->ip_lock); |
| if (!--oi->ip_open_count) |
| oi->ip_flags &= ~OCFS2_INODE_OPEN_DIRECT; |
| spin_unlock(&oi->ip_lock); |
| |
| mlog_exit(0); |
| |
| return 0; |
| } |
| |
| static int ocfs2_sync_file(struct file *file, |
| struct dentry *dentry, |
| int datasync) |
| { |
| int err = 0; |
| journal_t *journal; |
| struct inode *inode = dentry->d_inode; |
| struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
| |
| mlog_entry("(0x%p, 0x%p, %d, '%.*s')\n", file, dentry, datasync, |
| dentry->d_name.len, dentry->d_name.name); |
| |
| err = ocfs2_sync_inode(dentry->d_inode); |
| if (err) |
| goto bail; |
| |
| journal = osb->journal->j_journal; |
| err = journal_force_commit(journal); |
| |
| bail: |
| mlog_exit(err); |
| |
| return (err < 0) ? -EIO : 0; |
| } |
| |
| int ocfs2_set_inode_size(struct ocfs2_journal_handle *handle, |
| struct inode *inode, |
| struct buffer_head *fe_bh, |
| u64 new_i_size) |
| { |
| int status; |
| |
| mlog_entry_void(); |
| i_size_write(inode, new_i_size); |
| inode->i_blocks = ocfs2_align_bytes_to_sectors(new_i_size); |
| inode->i_ctime = inode->i_mtime = CURRENT_TIME; |
| |
| status = ocfs2_mark_inode_dirty(handle, inode, fe_bh); |
| if (status < 0) { |
| mlog_errno(status); |
| goto bail; |
| } |
| |
| bail: |
| mlog_exit(status); |
| return status; |
| } |
| |
| static int ocfs2_simple_size_update(struct inode *inode, |
| struct buffer_head *di_bh, |
| u64 new_i_size) |
| { |
| int ret; |
| struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
| struct ocfs2_journal_handle *handle = NULL; |
| |
| handle = ocfs2_start_trans(osb, NULL, |
| OCFS2_INODE_UPDATE_CREDITS); |
| if (handle == NULL) { |
| ret = -ENOMEM; |
| mlog_errno(ret); |
| goto out; |
| } |
| |
| ret = ocfs2_set_inode_size(handle, inode, di_bh, |
| new_i_size); |
| if (ret < 0) |
| mlog_errno(ret); |
| |
| ocfs2_commit_trans(handle); |
| out: |
| return ret; |
| } |
| |
| static int ocfs2_orphan_for_truncate(struct ocfs2_super *osb, |
| struct inode *inode, |
| struct buffer_head *fe_bh, |
| u64 new_i_size) |
| { |
| int status; |
| struct ocfs2_journal_handle *handle; |
| |
| mlog_entry_void(); |
| |
| /* TODO: This needs to actually orphan the inode in this |
| * transaction. */ |
| |
| handle = ocfs2_start_trans(osb, NULL, OCFS2_INODE_UPDATE_CREDITS); |
| if (IS_ERR(handle)) { |
| status = PTR_ERR(handle); |
| mlog_errno(status); |
| goto out; |
| } |
| |
| status = ocfs2_set_inode_size(handle, inode, fe_bh, new_i_size); |
| if (status < 0) |
| mlog_errno(status); |
| |
| ocfs2_commit_trans(handle); |
| out: |
| mlog_exit(status); |
| return status; |
| } |
| |
| static int ocfs2_truncate_file(struct inode *inode, |
| struct buffer_head *di_bh, |
| u64 new_i_size) |
| { |
| int status = 0; |
| struct ocfs2_dinode *fe = NULL; |
| struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
| struct ocfs2_truncate_context *tc = NULL; |
| |
| mlog_entry("(inode = %llu, new_i_size = %llu\n", |
| (unsigned long long)OCFS2_I(inode)->ip_blkno, |
| (unsigned long long)new_i_size); |
| |
| truncate_inode_pages(inode->i_mapping, new_i_size); |
| |
| fe = (struct ocfs2_dinode *) di_bh->b_data; |
| if (!OCFS2_IS_VALID_DINODE(fe)) { |
| OCFS2_RO_ON_INVALID_DINODE(inode->i_sb, fe); |
| status = -EIO; |
| goto bail; |
| } |
| |
| mlog_bug_on_msg(le64_to_cpu(fe->i_size) != i_size_read(inode), |
| "Inode %llu, inode i_size = %lld != di " |
| "i_size = %llu, i_flags = 0x%x\n", |
| (unsigned long long)OCFS2_I(inode)->ip_blkno, |
| i_size_read(inode), |
| (unsigned long long)le64_to_cpu(fe->i_size), |
| le32_to_cpu(fe->i_flags)); |
| |
| if (new_i_size > le64_to_cpu(fe->i_size)) { |
| mlog(0, "asked to truncate file with size (%llu) to size (%llu)!\n", |
| (unsigned long long)le64_to_cpu(fe->i_size), |
| (unsigned long long)new_i_size); |
| status = -EINVAL; |
| mlog_errno(status); |
| goto bail; |
| } |
| |
| mlog(0, "inode %llu, i_size = %llu, new_i_size = %llu\n", |
| (unsigned long long)le64_to_cpu(fe->i_blkno), |
| (unsigned long long)le64_to_cpu(fe->i_size), |
| (unsigned long long)new_i_size); |
| |
| /* lets handle the simple truncate cases before doing any more |
| * cluster locking. */ |
| if (new_i_size == le64_to_cpu(fe->i_size)) |
| goto bail; |
| |
| /* This forces other nodes to sync and drop their pages. Do |
| * this even if we have a truncate without allocation change - |
| * ocfs2 cluster sizes can be much greater than page size, so |
| * we have to truncate them anyway. */ |
| status = ocfs2_data_lock(inode, 1); |
| if (status < 0) { |
| mlog_errno(status); |
| goto bail; |
| } |
| ocfs2_data_unlock(inode, 1); |
| |
| if (le32_to_cpu(fe->i_clusters) == |
| ocfs2_clusters_for_bytes(osb->sb, new_i_size)) { |
| mlog(0, "fe->i_clusters = %u, so we do a simple truncate\n", |
| fe->i_clusters); |
| /* No allocation change is required, so lets fast path |
| * this truncate. */ |
| status = ocfs2_simple_size_update(inode, di_bh, new_i_size); |
| if (status < 0) |
| mlog_errno(status); |
| goto bail; |
| } |
| |
| /* alright, we're going to need to do a full blown alloc size |
| * change. Orphan the inode so that recovery can complete the |
| * truncate if necessary. This does the task of marking |
| * i_size. */ |
| status = ocfs2_orphan_for_truncate(osb, inode, di_bh, new_i_size); |
| if (status < 0) { |
| mlog_errno(status); |
| goto bail; |
| } |
| |
| status = ocfs2_prepare_truncate(osb, inode, di_bh, &tc); |
| if (status < 0) { |
| mlog_errno(status); |
| goto bail; |
| } |
| |
| status = ocfs2_commit_truncate(osb, inode, di_bh, tc); |
| if (status < 0) { |
| mlog_errno(status); |
| goto bail; |
| } |
| |
| /* TODO: orphan dir cleanup here. */ |
| bail: |
| |
| mlog_exit(status); |
| return status; |
| } |
| |
| /* |
| * extend allocation only here. |
| * we'll update all the disk stuff, and oip->alloc_size |
| * |
| * expect stuff to be locked, a transaction started and enough data / |
| * metadata reservations in the contexts. |
| * |
| * Will return -EAGAIN, and a reason if a restart is needed. |
| * If passed in, *reason will always be set, even in error. |
| */ |
| int ocfs2_do_extend_allocation(struct ocfs2_super *osb, |
| struct inode *inode, |
| u32 clusters_to_add, |
| struct buffer_head *fe_bh, |
| struct ocfs2_journal_handle *handle, |
| struct ocfs2_alloc_context *data_ac, |
| struct ocfs2_alloc_context *meta_ac, |
| enum ocfs2_alloc_restarted *reason_ret) |
| { |
| int status = 0; |
| int free_extents; |
| struct ocfs2_dinode *fe = (struct ocfs2_dinode *) fe_bh->b_data; |
| enum ocfs2_alloc_restarted reason = RESTART_NONE; |
| u32 bit_off, num_bits; |
| u64 block; |
| |
| BUG_ON(!clusters_to_add); |
| |
| free_extents = ocfs2_num_free_extents(osb, inode, fe); |
| if (free_extents < 0) { |
| status = free_extents; |
| mlog_errno(status); |
| goto leave; |
| } |
| |
| /* there are two cases which could cause us to EAGAIN in the |
| * we-need-more-metadata case: |
| * 1) we haven't reserved *any* |
| * 2) we are so fragmented, we've needed to add metadata too |
| * many times. */ |
| if (!free_extents && !meta_ac) { |
| mlog(0, "we haven't reserved any metadata!\n"); |
| status = -EAGAIN; |
| reason = RESTART_META; |
| goto leave; |
| } else if ((!free_extents) |
| && (ocfs2_alloc_context_bits_left(meta_ac) |
| < ocfs2_extend_meta_needed(fe))) { |
| mlog(0, "filesystem is really fragmented...\n"); |
| status = -EAGAIN; |
| reason = RESTART_META; |
| goto leave; |
| } |
| |
| status = ocfs2_claim_clusters(osb, handle, data_ac, 1, |
| &bit_off, &num_bits); |
| if (status < 0) { |
| if (status != -ENOSPC) |
| mlog_errno(status); |
| goto leave; |
| } |
| |
| BUG_ON(num_bits > clusters_to_add); |
| |
| /* reserve our write early -- insert_extent may update the inode */ |
| status = ocfs2_journal_access(handle, inode, fe_bh, |
| OCFS2_JOURNAL_ACCESS_WRITE); |
| if (status < 0) { |
| mlog_errno(status); |
| goto leave; |
| } |
| |
| block = ocfs2_clusters_to_blocks(osb->sb, bit_off); |
| mlog(0, "Allocating %u clusters at block %u for inode %llu\n", |
| num_bits, bit_off, (unsigned long long)OCFS2_I(inode)->ip_blkno); |
| status = ocfs2_insert_extent(osb, handle, inode, fe_bh, block, |
| num_bits, meta_ac); |
| if (status < 0) { |
| mlog_errno(status); |
| goto leave; |
| } |
| |
| le32_add_cpu(&fe->i_clusters, num_bits); |
| spin_lock(&OCFS2_I(inode)->ip_lock); |
| OCFS2_I(inode)->ip_clusters = le32_to_cpu(fe->i_clusters); |
| spin_unlock(&OCFS2_I(inode)->ip_lock); |
| |
| status = ocfs2_journal_dirty(handle, fe_bh); |
| if (status < 0) { |
| mlog_errno(status); |
| goto leave; |
| } |
| |
| clusters_to_add -= num_bits; |
| |
| if (clusters_to_add) { |
| mlog(0, "need to alloc once more, clusters = %u, wanted = " |
| "%u\n", fe->i_clusters, clusters_to_add); |
| status = -EAGAIN; |
| reason = RESTART_TRANS; |
| } |
| |
| leave: |
| mlog_exit(status); |
| if (reason_ret) |
| *reason_ret = reason; |
| return status; |
| } |
| |
| static int ocfs2_extend_allocation(struct inode *inode, |
| u32 clusters_to_add) |
| { |
| int status = 0; |
| int restart_func = 0; |
| int drop_alloc_sem = 0; |
| int credits, num_free_extents; |
| u32 prev_clusters; |
| struct buffer_head *bh = NULL; |
| struct ocfs2_dinode *fe = NULL; |
| struct ocfs2_journal_handle *handle = NULL; |
| struct ocfs2_alloc_context *data_ac = NULL; |
| struct ocfs2_alloc_context *meta_ac = NULL; |
| enum ocfs2_alloc_restarted why; |
| struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
| |
| mlog_entry("(clusters_to_add = %u)\n", clusters_to_add); |
| |
| status = ocfs2_read_block(osb, OCFS2_I(inode)->ip_blkno, &bh, |
| OCFS2_BH_CACHED, inode); |
| if (status < 0) { |
| mlog_errno(status); |
| goto leave; |
| } |
| |
| fe = (struct ocfs2_dinode *) bh->b_data; |
| if (!OCFS2_IS_VALID_DINODE(fe)) { |
| OCFS2_RO_ON_INVALID_DINODE(inode->i_sb, fe); |
| status = -EIO; |
| goto leave; |
| } |
| |
| restart_all: |
| BUG_ON(le32_to_cpu(fe->i_clusters) != OCFS2_I(inode)->ip_clusters); |
| |
| mlog(0, "extend inode %llu, i_size = %lld, fe->i_clusters = %u, " |
| "clusters_to_add = %u\n", |
| (unsigned long long)OCFS2_I(inode)->ip_blkno, i_size_read(inode), |
| fe->i_clusters, clusters_to_add); |
| |
| handle = ocfs2_alloc_handle(osb); |
| if (handle == NULL) { |
| status = -ENOMEM; |
| mlog_errno(status); |
| goto leave; |
| } |
| |
| num_free_extents = ocfs2_num_free_extents(osb, |
| inode, |
| fe); |
| if (num_free_extents < 0) { |
| status = num_free_extents; |
| mlog_errno(status); |
| goto leave; |
| } |
| |
| if (!num_free_extents) { |
| status = ocfs2_reserve_new_metadata(osb, |
| handle, |
| fe, |
| &meta_ac); |
| if (status < 0) { |
| if (status != -ENOSPC) |
| mlog_errno(status); |
| goto leave; |
| } |
| } |
| |
| status = ocfs2_reserve_clusters(osb, |
| handle, |
| clusters_to_add, |
| &data_ac); |
| if (status < 0) { |
| if (status != -ENOSPC) |
| mlog_errno(status); |
| goto leave; |
| } |
| |
| /* blocks peope in read/write from reading our allocation |
| * until we're done changing it. We depend on i_mutex to block |
| * other extend/truncate calls while we're here. Ordering wrt |
| * start_trans is important here -- always do it before! */ |
| down_write(&OCFS2_I(inode)->ip_alloc_sem); |
| drop_alloc_sem = 1; |
| |
| credits = ocfs2_calc_extend_credits(osb->sb, fe, clusters_to_add); |
| handle = ocfs2_start_trans(osb, handle, credits); |
| if (IS_ERR(handle)) { |
| status = PTR_ERR(handle); |
| handle = NULL; |
| mlog_errno(status); |
| goto leave; |
| } |
| |
| restarted_transaction: |
| /* reserve a write to the file entry early on - that we if we |
| * run out of credits in the allocation path, we can still |
| * update i_size. */ |
| status = ocfs2_journal_access(handle, inode, bh, |
| OCFS2_JOURNAL_ACCESS_WRITE); |
| if (status < 0) { |
| mlog_errno(status); |
| goto leave; |
| } |
| |
| prev_clusters = OCFS2_I(inode)->ip_clusters; |
| |
| status = ocfs2_do_extend_allocation(osb, |
| inode, |
| clusters_to_add, |
| bh, |
| handle, |
| data_ac, |
| meta_ac, |
| &why); |
| if ((status < 0) && (status != -EAGAIN)) { |
| if (status != -ENOSPC) |
| mlog_errno(status); |
| goto leave; |
| } |
| |
| status = ocfs2_journal_dirty(handle, bh); |
| if (status < 0) { |
| mlog_errno(status); |
| goto leave; |
| } |
| |
| spin_lock(&OCFS2_I(inode)->ip_lock); |
| clusters_to_add -= (OCFS2_I(inode)->ip_clusters - prev_clusters); |
| spin_unlock(&OCFS2_I(inode)->ip_lock); |
| |
| if (why != RESTART_NONE && clusters_to_add) { |
| if (why == RESTART_META) { |
| mlog(0, "restarting function.\n"); |
| restart_func = 1; |
| } else { |
| BUG_ON(why != RESTART_TRANS); |
| |
| mlog(0, "restarting transaction.\n"); |
| /* TODO: This can be more intelligent. */ |
| credits = ocfs2_calc_extend_credits(osb->sb, |
| fe, |
| clusters_to_add); |
| status = ocfs2_extend_trans(handle->k_handle, credits); |
| if (status < 0) { |
| /* handle still has to be committed at |
| * this point. */ |
| status = -ENOMEM; |
| mlog_errno(status); |
| goto leave; |
| } |
| goto restarted_transaction; |
| } |
| } |
| |
| mlog(0, "fe: i_clusters = %u, i_size=%llu\n", |
| fe->i_clusters, (unsigned long long)fe->i_size); |
| mlog(0, "inode: ip_clusters=%u, i_size=%lld\n", |
| OCFS2_I(inode)->ip_clusters, i_size_read(inode)); |
| |
| leave: |
| if (drop_alloc_sem) { |
| up_write(&OCFS2_I(inode)->ip_alloc_sem); |
| drop_alloc_sem = 0; |
| } |
| if (handle) { |
| ocfs2_commit_trans(handle); |
| handle = NULL; |
| } |
| 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 ((!status) && restart_func) { |
| restart_func = 0; |
| goto restart_all; |
| } |
| if (bh) { |
| brelse(bh); |
| bh = NULL; |
| } |
| |
| mlog_exit(status); |
| return status; |
| } |
| |
| /* Some parts of this taken from generic_cont_expand, which turned out |
| * to be too fragile to do exactly what we need without us having to |
| * worry about recursive locking in ->prepare_write() and |
| * ->commit_write(). */ |
| static int ocfs2_write_zero_page(struct inode *inode, |
| u64 size) |
| { |
| struct address_space *mapping = inode->i_mapping; |
| struct page *page; |
| unsigned long index; |
| unsigned int offset; |
| struct ocfs2_journal_handle *handle = NULL; |
| int ret; |
| |
| offset = (size & (PAGE_CACHE_SIZE-1)); /* Within page */ |
| /* ugh. in prepare/commit_write, if from==to==start of block, we |
| ** skip the prepare. make sure we never send an offset for the start |
| ** of a block |
| */ |
| if ((offset & (inode->i_sb->s_blocksize - 1)) == 0) { |
| offset++; |
| } |
| index = size >> PAGE_CACHE_SHIFT; |
| |
| page = grab_cache_page(mapping, index); |
| if (!page) { |
| ret = -ENOMEM; |
| mlog_errno(ret); |
| goto out; |
| } |
| |
| ret = ocfs2_prepare_write_nolock(inode, page, offset, offset); |
| if (ret < 0) { |
| mlog_errno(ret); |
| goto out_unlock; |
| } |
| |
| if (ocfs2_should_order_data(inode)) { |
| handle = ocfs2_start_walk_page_trans(inode, page, offset, |
| offset); |
| if (IS_ERR(handle)) { |
| ret = PTR_ERR(handle); |
| handle = NULL; |
| goto out_unlock; |
| } |
| } |
| |
| /* must not update i_size! */ |
| ret = block_commit_write(page, offset, offset); |
| if (ret < 0) |
| mlog_errno(ret); |
| else |
| ret = 0; |
| |
| if (handle) |
| ocfs2_commit_trans(handle); |
| out_unlock: |
| unlock_page(page); |
| page_cache_release(page); |
| out: |
| return ret; |
| } |
| |
| static int ocfs2_zero_extend(struct inode *inode, |
| u64 zero_to_size) |
| { |
| int ret = 0; |
| u64 start_off; |
| struct super_block *sb = inode->i_sb; |
| |
| start_off = ocfs2_align_bytes_to_blocks(sb, i_size_read(inode)); |
| while (start_off < zero_to_size) { |
| ret = ocfs2_write_zero_page(inode, start_off); |
| if (ret < 0) { |
| mlog_errno(ret); |
| goto out; |
| } |
| |
| start_off += sb->s_blocksize; |
| |
| /* |
| * Very large extends have the potential to lock up |
| * the cpu for extended periods of time. |
| */ |
| cond_resched(); |
| } |
| |
| out: |
| return ret; |
| } |
| |
| /* |
| * A tail_to_skip value > 0 indicates that we're being called from |
| * ocfs2_file_aio_write(). This has the following implications: |
| * |
| * - we don't want to update i_size |
| * - di_bh will be NULL, which is fine because it's only used in the |
| * case where we want to update i_size. |
| * - ocfs2_zero_extend() will then only be filling the hole created |
| * between i_size and the start of the write. |
| */ |
| static int ocfs2_extend_file(struct inode *inode, |
| struct buffer_head *di_bh, |
| u64 new_i_size, |
| size_t tail_to_skip) |
| { |
| int ret = 0; |
| u32 clusters_to_add; |
| |
| BUG_ON(!tail_to_skip && !di_bh); |
| |
| /* setattr sometimes calls us like this. */ |
| if (new_i_size == 0) |
| goto out; |
| |
| if (i_size_read(inode) == new_i_size) |
| goto out; |
| BUG_ON(new_i_size < i_size_read(inode)); |
| |
| clusters_to_add = ocfs2_clusters_for_bytes(inode->i_sb, new_i_size) - |
| OCFS2_I(inode)->ip_clusters; |
| |
| /* |
| * protect the pages that ocfs2_zero_extend is going to be |
| * pulling into the page cache.. we do this before the |
| * metadata extend so that we don't get into the situation |
| * where we've extended the metadata but can't get the data |
| * lock to zero. |
| */ |
| ret = ocfs2_data_lock(inode, 1); |
| if (ret < 0) { |
| mlog_errno(ret); |
| goto out; |
| } |
| |
| if (clusters_to_add) { |
| ret = ocfs2_extend_allocation(inode, clusters_to_add); |
| if (ret < 0) { |
| mlog_errno(ret); |
| goto out_unlock; |
| } |
| } |
| |
| /* |
| * Call this even if we don't add any clusters to the tree. We |
| * still need to zero the area between the old i_size and the |
| * new i_size. |
| */ |
| ret = ocfs2_zero_extend(inode, (u64)new_i_size - tail_to_skip); |
| if (ret < 0) { |
| mlog_errno(ret); |
| goto out_unlock; |
| } |
| |
| if (!tail_to_skip) { |
| /* We're being called from ocfs2_setattr() which wants |
| * us to update i_size */ |
| ret = ocfs2_simple_size_update(inode, di_bh, new_i_size); |
| if (ret < 0) |
| mlog_errno(ret); |
| } |
| |
| out_unlock: |
| ocfs2_data_unlock(inode, 1); |
| |
| out: |
| return ret; |
| } |
| |
| int ocfs2_setattr(struct dentry *dentry, struct iattr *attr) |
| { |
| int status = 0, size_change; |
| struct inode *inode = dentry->d_inode; |
| struct super_block *sb = inode->i_sb; |
| struct ocfs2_super *osb = OCFS2_SB(sb); |
| struct buffer_head *bh = NULL; |
| struct ocfs2_journal_handle *handle = NULL; |
| |
| mlog_entry("(0x%p, '%.*s')\n", dentry, |
| dentry->d_name.len, dentry->d_name.name); |
| |
| if (attr->ia_valid & ATTR_MODE) |
| mlog(0, "mode change: %d\n", attr->ia_mode); |
| if (attr->ia_valid & ATTR_UID) |
| mlog(0, "uid change: %d\n", attr->ia_uid); |
| if (attr->ia_valid & ATTR_GID) |
| mlog(0, "gid change: %d\n", attr->ia_gid); |
| if (attr->ia_valid & ATTR_SIZE) |
| mlog(0, "size change...\n"); |
| if (attr->ia_valid & (ATTR_ATIME | ATTR_MTIME | ATTR_CTIME)) |
| mlog(0, "time change...\n"); |
| |
| #define OCFS2_VALID_ATTRS (ATTR_ATIME | ATTR_MTIME | ATTR_CTIME | ATTR_SIZE \ |
| | ATTR_GID | ATTR_UID | ATTR_MODE) |
| if (!(attr->ia_valid & OCFS2_VALID_ATTRS)) { |
| mlog(0, "can't handle attrs: 0x%x\n", attr->ia_valid); |
| return 0; |
| } |
| |
| status = inode_change_ok(inode, attr); |
| if (status) |
| return status; |
| |
| size_change = S_ISREG(inode->i_mode) && attr->ia_valid & ATTR_SIZE; |
| if (size_change) { |
| status = ocfs2_rw_lock(inode, 1); |
| if (status < 0) { |
| mlog_errno(status); |
| goto bail; |
| } |
| } |
| |
| status = ocfs2_meta_lock(inode, NULL, &bh, 1); |
| if (status < 0) { |
| if (status != -ENOENT) |
| mlog_errno(status); |
| goto bail_unlock_rw; |
| } |
| |
| if (size_change && attr->ia_size != i_size_read(inode)) { |
| if (i_size_read(inode) > attr->ia_size) |
| status = ocfs2_truncate_file(inode, bh, attr->ia_size); |
| else |
| status = ocfs2_extend_file(inode, bh, attr->ia_size, 0); |
| if (status < 0) { |
| if (status != -ENOSPC) |
| mlog_errno(status); |
| status = -ENOSPC; |
| goto bail_unlock; |
| } |
| } |
| |
| handle = ocfs2_start_trans(osb, NULL, OCFS2_INODE_UPDATE_CREDITS); |
| if (IS_ERR(handle)) { |
| status = PTR_ERR(handle); |
| mlog_errno(status); |
| goto bail_unlock; |
| } |
| |
| status = inode_setattr(inode, attr); |
| if (status < 0) { |
| mlog_errno(status); |
| goto bail_commit; |
| } |
| |
| status = ocfs2_mark_inode_dirty(handle, inode, bh); |
| if (status < 0) |
| mlog_errno(status); |
| |
| bail_commit: |
| ocfs2_commit_trans(handle); |
| bail_unlock: |
| ocfs2_meta_unlock(inode, 1); |
| bail_unlock_rw: |
| if (size_change) |
| ocfs2_rw_unlock(inode, 1); |
| bail: |
| if (bh) |
| brelse(bh); |
| |
| mlog_exit(status); |
| return status; |
| } |
| |
| int ocfs2_getattr(struct vfsmount *mnt, |
| struct dentry *dentry, |
| struct kstat *stat) |
| { |
| struct inode *inode = dentry->d_inode; |
| struct super_block *sb = dentry->d_inode->i_sb; |
| struct ocfs2_super *osb = sb->s_fs_info; |
| int err; |
| |
| mlog_entry_void(); |
| |
| err = ocfs2_inode_revalidate(dentry); |
| if (err) { |
| if (err != -ENOENT) |
| mlog_errno(err); |
| goto bail; |
| } |
| |
| generic_fillattr(inode, stat); |
| |
| /* We set the blksize from the cluster size for performance */ |
| stat->blksize = osb->s_clustersize; |
| |
| bail: |
| mlog_exit(err); |
| |
| return err; |
| } |
| |
| static int ocfs2_write_remove_suid(struct inode *inode) |
| { |
| int ret; |
| struct buffer_head *bh = NULL; |
| struct ocfs2_inode_info *oi = OCFS2_I(inode); |
| struct ocfs2_journal_handle *handle; |
| struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
| struct ocfs2_dinode *di; |
| |
| mlog_entry("(Inode %llu, mode 0%o)\n", |
| (unsigned long long)oi->ip_blkno, inode->i_mode); |
| |
| handle = ocfs2_start_trans(osb, NULL, OCFS2_INODE_UPDATE_CREDITS); |
| if (handle == NULL) { |
| ret = -ENOMEM; |
| mlog_errno(ret); |
| goto out; |
| } |
| |
| ret = ocfs2_read_block(osb, oi->ip_blkno, &bh, OCFS2_BH_CACHED, inode); |
| if (ret < 0) { |
| mlog_errno(ret); |
| goto out_trans; |
| } |
| |
| ret = ocfs2_journal_access(handle, inode, bh, |
| OCFS2_JOURNAL_ACCESS_WRITE); |
| if (ret < 0) { |
| mlog_errno(ret); |
| goto out_bh; |
| } |
| |
| inode->i_mode &= ~S_ISUID; |
| if ((inode->i_mode & S_ISGID) && (inode->i_mode & S_IXGRP)) |
| inode->i_mode &= ~S_ISGID; |
| |
| di = (struct ocfs2_dinode *) bh->b_data; |
| di->i_mode = cpu_to_le16(inode->i_mode); |
| |
| ret = ocfs2_journal_dirty(handle, bh); |
| if (ret < 0) |
| mlog_errno(ret); |
| out_bh: |
| brelse(bh); |
| out_trans: |
| ocfs2_commit_trans(handle); |
| out: |
| mlog_exit(ret); |
| return ret; |
| } |
| |
| static inline int ocfs2_write_should_remove_suid(struct inode *inode) |
| { |
| mode_t mode = inode->i_mode; |
| |
| if (!capable(CAP_FSETID)) { |
| if (unlikely(mode & S_ISUID)) |
| return 1; |
| |
| if (unlikely((mode & S_ISGID) && (mode & S_IXGRP))) |
| return 1; |
| } |
| return 0; |
| } |
| |
| static ssize_t ocfs2_file_aio_write(struct kiocb *iocb, |
| const struct iovec *iov, |
| unsigned long nr_segs, |
| loff_t pos) |
| { |
| int ret, rw_level = -1, meta_level = -1, have_alloc_sem = 0; |
| u32 clusters; |
| struct file *filp = iocb->ki_filp; |
| struct inode *inode = filp->f_dentry->d_inode; |
| loff_t newsize, saved_pos; |
| |
| mlog_entry("(0x%p, %u, '%.*s')\n", filp, |
| (unsigned int)nr_segs, |
| filp->f_dentry->d_name.len, |
| filp->f_dentry->d_name.name); |
| |
| /* happy write of zero bytes */ |
| if (iocb->ki_left == 0) |
| return 0; |
| |
| if (!inode) { |
| mlog(0, "bad inode\n"); |
| return -EIO; |
| } |
| |
| mutex_lock(&inode->i_mutex); |
| /* to match setattr's i_mutex -> i_alloc_sem -> rw_lock ordering */ |
| if (filp->f_flags & O_DIRECT) { |
| have_alloc_sem = 1; |
| down_read(&inode->i_alloc_sem); |
| } |
| |
| /* concurrent O_DIRECT writes are allowed */ |
| rw_level = (filp->f_flags & O_DIRECT) ? 0 : 1; |
| ret = ocfs2_rw_lock(inode, rw_level); |
| if (ret < 0) { |
| rw_level = -1; |
| mlog_errno(ret); |
| goto out; |
| } |
| |
| /* |
| * We sample i_size under a read level meta lock to see if our write |
| * is extending the file, if it is we back off and get a write level |
| * meta lock. |
| */ |
| meta_level = (filp->f_flags & O_APPEND) ? 1 : 0; |
| for(;;) { |
| ret = ocfs2_meta_lock(inode, NULL, NULL, meta_level); |
| if (ret < 0) { |
| meta_level = -1; |
| mlog_errno(ret); |
| goto out; |
| } |
| |
| /* Clear suid / sgid if necessary. We do this here |
| * instead of later in the write path because |
| * remove_suid() calls ->setattr without any hint that |
| * we may have already done our cluster locking. Since |
| * ocfs2_setattr() *must* take cluster locks to |
| * proceeed, this will lead us to recursively lock the |
| * inode. There's also the dinode i_size state which |
| * can be lost via setattr during extending writes (we |
| * set inode->i_size at the end of a write. */ |
| if (ocfs2_write_should_remove_suid(inode)) { |
| if (meta_level == 0) { |
| ocfs2_meta_unlock(inode, meta_level); |
| meta_level = 1; |
| continue; |
| } |
| |
| ret = ocfs2_write_remove_suid(inode); |
| if (ret < 0) { |
| mlog_errno(ret); |
| goto out; |
| } |
| } |
| |
| /* work on a copy of ppos until we're sure that we won't have |
| * to recalculate it due to relocking. */ |
| if (filp->f_flags & O_APPEND) { |
| saved_pos = i_size_read(inode); |
| mlog(0, "O_APPEND: inode->i_size=%llu\n", saved_pos); |
| } else { |
| saved_pos = iocb->ki_pos; |
| } |
| newsize = iocb->ki_left + saved_pos; |
| |
| mlog(0, "pos=%lld newsize=%lld cursize=%lld\n", |
| (long long) saved_pos, (long long) newsize, |
| (long long) i_size_read(inode)); |
| |
| /* No need for a higher level metadata lock if we're |
| * never going past i_size. */ |
| if (newsize <= i_size_read(inode)) |
| break; |
| |
| if (meta_level == 0) { |
| ocfs2_meta_unlock(inode, meta_level); |
| meta_level = 1; |
| continue; |
| } |
| |
| spin_lock(&OCFS2_I(inode)->ip_lock); |
| clusters = ocfs2_clusters_for_bytes(inode->i_sb, newsize) - |
| OCFS2_I(inode)->ip_clusters; |
| spin_unlock(&OCFS2_I(inode)->ip_lock); |
| |
| mlog(0, "Writing at EOF, may need more allocation: " |
| "i_size = %lld, newsize = %lld, need %u clusters\n", |
| (long long) i_size_read(inode), (long long) newsize, |
| clusters); |
| |
| /* We only want to continue the rest of this loop if |
| * our extend will actually require more |
| * allocation. */ |
| if (!clusters) |
| break; |
| |
| ret = ocfs2_extend_file(inode, NULL, newsize, iocb->ki_left); |
| if (ret < 0) { |
| if (ret != -ENOSPC) |
| mlog_errno(ret); |
| goto out; |
| } |
| break; |
| } |
| |
| /* ok, we're done with i_size and alloc work */ |
| iocb->ki_pos = saved_pos; |
| ocfs2_meta_unlock(inode, meta_level); |
| meta_level = -1; |
| |
| /* communicate with ocfs2_dio_end_io */ |
| ocfs2_iocb_set_rw_locked(iocb); |
| |
| ret = generic_file_aio_write_nolock(iocb, iov, nr_segs, iocb->ki_pos); |
| |
| /* buffered aio wouldn't have proper lock coverage today */ |
| BUG_ON(ret == -EIOCBQUEUED && !(filp->f_flags & O_DIRECT)); |
| |
| /* |
| * deep in g_f_a_w_n()->ocfs2_direct_IO we pass in a ocfs2_dio_end_io |
| * function pointer which is called when o_direct io completes so that |
| * it can unlock our rw lock. (it's the clustered equivalent of |
| * i_alloc_sem; protects truncate from racing with pending ios). |
| * Unfortunately there are error cases which call end_io and others |
| * that don't. so we don't have to unlock the rw_lock if either an |
| * async dio is going to do it in the future or an end_io after an |
| * error has already done it. |
| */ |
| if (ret == -EIOCBQUEUED || !ocfs2_iocb_is_rw_locked(iocb)) { |
| rw_level = -1; |
| have_alloc_sem = 0; |
| } |
| |
| out: |
| if (meta_level != -1) |
| ocfs2_meta_unlock(inode, meta_level); |
| if (have_alloc_sem) |
| up_read(&inode->i_alloc_sem); |
| if (rw_level != -1) |
| ocfs2_rw_unlock(inode, rw_level); |
| mutex_unlock(&inode->i_mutex); |
| |
| mlog_exit(ret); |
| return ret; |
| } |
| |
| static ssize_t ocfs2_file_aio_read(struct kiocb *iocb, |
| const struct iovec *iov, |
| unsigned long nr_segs, |
| loff_t pos) |
| { |
| int ret = 0, rw_level = -1, have_alloc_sem = 0; |
| struct file *filp = iocb->ki_filp; |
| struct inode *inode = filp->f_dentry->d_inode; |
| |
| mlog_entry("(0x%p, %u, '%.*s')\n", filp, |
| (unsigned int)nr_segs, |
| filp->f_dentry->d_name.len, |
| filp->f_dentry->d_name.name); |
| |
| if (!inode) { |
| ret = -EINVAL; |
| mlog_errno(ret); |
| goto bail; |
| } |
| |
| /* |
| * buffered reads protect themselves in ->readpage(). O_DIRECT reads |
| * need locks to protect pending reads from racing with truncate. |
| */ |
| if (filp->f_flags & O_DIRECT) { |
| down_read(&inode->i_alloc_sem); |
| have_alloc_sem = 1; |
| |
| ret = ocfs2_rw_lock(inode, 0); |
| if (ret < 0) { |
| mlog_errno(ret); |
| goto bail; |
| } |
| rw_level = 0; |
| /* communicate with ocfs2_dio_end_io */ |
| ocfs2_iocb_set_rw_locked(iocb); |
| } |
| |
| /* |
| * We're fine letting folks race truncates and extending |
| * writes with read across the cluster, just like they can |
| * locally. Hence no rw_lock during read. |
| * |
| * Take and drop the meta data lock to update inode fields |
| * like i_size. This allows the checks down below |
| * generic_file_aio_read() a chance of actually working. |
| */ |
| ret = ocfs2_meta_lock(inode, NULL, NULL, 0); |
| if (ret < 0) { |
| mlog_errno(ret); |
| goto bail; |
| } |
| ocfs2_meta_unlock(inode, 0); |
| |
| ret = generic_file_aio_read(iocb, iov, nr_segs, iocb->ki_pos); |
| if (ret == -EINVAL) |
| mlog(ML_ERROR, "generic_file_aio_read returned -EINVAL\n"); |
| |
| /* buffered aio wouldn't have proper lock coverage today */ |
| BUG_ON(ret == -EIOCBQUEUED && !(filp->f_flags & O_DIRECT)); |
| |
| /* see ocfs2_file_aio_write */ |
| if (ret == -EIOCBQUEUED || !ocfs2_iocb_is_rw_locked(iocb)) { |
| rw_level = -1; |
| have_alloc_sem = 0; |
| } |
| |
| bail: |
| if (have_alloc_sem) |
| up_read(&inode->i_alloc_sem); |
| if (rw_level != -1) |
| ocfs2_rw_unlock(inode, rw_level); |
| mlog_exit(ret); |
| |
| return ret; |
| } |
| |
| struct inode_operations ocfs2_file_iops = { |
| .setattr = ocfs2_setattr, |
| .getattr = ocfs2_getattr, |
| }; |
| |
| struct inode_operations ocfs2_special_file_iops = { |
| .setattr = ocfs2_setattr, |
| .getattr = ocfs2_getattr, |
| }; |
| |
| const struct file_operations ocfs2_fops = { |
| .read = do_sync_read, |
| .write = do_sync_write, |
| .sendfile = generic_file_sendfile, |
| .mmap = ocfs2_mmap, |
| .fsync = ocfs2_sync_file, |
| .release = ocfs2_file_release, |
| .open = ocfs2_file_open, |
| .aio_read = ocfs2_file_aio_read, |
| .aio_write = ocfs2_file_aio_write, |
| .ioctl = ocfs2_ioctl, |
| }; |
| |
| const struct file_operations ocfs2_dops = { |
| .read = generic_read_dir, |
| .readdir = ocfs2_readdir, |
| .fsync = ocfs2_sync_file, |
| .ioctl = ocfs2_ioctl, |
| }; |