| /* -*- 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> |
| #include <linux/splice.h> |
| #include <linux/mount.h> |
| #include <linux/writeback.h> |
| #include <linux/falloc.h> |
| #include <linux/quotaops.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 "locks.h" |
| #include "mmap.h" |
| #include "suballoc.h" |
| #include "super.h" |
| #include "xattr.h" |
| #include "acl.h" |
| #include "quota.h" |
| #include "refcounttree.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_init_file_private(struct inode *inode, struct file *file) |
| { |
| struct ocfs2_file_private *fp; |
| |
| fp = kzalloc(sizeof(struct ocfs2_file_private), GFP_KERNEL); |
| if (!fp) |
| return -ENOMEM; |
| |
| fp->fp_file = file; |
| mutex_init(&fp->fp_mutex); |
| ocfs2_file_lock_res_init(&fp->fp_flock, fp); |
| file->private_data = fp; |
| |
| return 0; |
| } |
| |
| static void ocfs2_free_file_private(struct inode *inode, struct file *file) |
| { |
| struct ocfs2_file_private *fp = file->private_data; |
| struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
| |
| if (fp) { |
| ocfs2_simple_drop_lockres(osb, &fp->fp_flock); |
| ocfs2_lock_res_free(&fp->fp_flock); |
| kfree(fp); |
| file->private_data = NULL; |
| } |
| } |
| |
| 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_path.dentry->d_name.len, file->f_path.dentry->d_name.name); |
| |
| if (file->f_mode & FMODE_WRITE) |
| dquot_initialize(inode); |
| |
| 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 = ocfs2_init_file_private(inode, file); |
| if (status) { |
| /* |
| * We want to set open count back if we're failing the |
| * open. |
| */ |
| spin_lock(&oi->ip_lock); |
| oi->ip_open_count--; |
| spin_unlock(&oi->ip_lock); |
| } |
| |
| 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_path.dentry->d_name.len, |
| file->f_path.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); |
| |
| ocfs2_free_file_private(inode, file); |
| |
| mlog_exit(0); |
| |
| return 0; |
| } |
| |
| static int ocfs2_dir_open(struct inode *inode, struct file *file) |
| { |
| return ocfs2_init_file_private(inode, file); |
| } |
| |
| static int ocfs2_dir_release(struct inode *inode, struct file *file) |
| { |
| ocfs2_free_file_private(inode, file); |
| 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; |
| |
| if (datasync && !(inode->i_state & I_DIRTY_DATASYNC)) |
| goto bail; |
| |
| journal = osb->journal->j_journal; |
| err = jbd2_journal_force_commit(journal); |
| |
| bail: |
| mlog_exit(err); |
| |
| return (err < 0) ? -EIO : 0; |
| } |
| |
| int ocfs2_should_update_atime(struct inode *inode, |
| struct vfsmount *vfsmnt) |
| { |
| struct timespec now; |
| struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
| |
| if (ocfs2_is_hard_readonly(osb) || ocfs2_is_soft_readonly(osb)) |
| return 0; |
| |
| if ((inode->i_flags & S_NOATIME) || |
| ((inode->i_sb->s_flags & MS_NODIRATIME) && S_ISDIR(inode->i_mode))) |
| return 0; |
| |
| /* |
| * We can be called with no vfsmnt structure - NFSD will |
| * sometimes do this. |
| * |
| * Note that our action here is different than touch_atime() - |
| * if we can't tell whether this is a noatime mount, then we |
| * don't know whether to trust the value of s_atime_quantum. |
| */ |
| if (vfsmnt == NULL) |
| return 0; |
| |
| if ((vfsmnt->mnt_flags & MNT_NOATIME) || |
| ((vfsmnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(inode->i_mode))) |
| return 0; |
| |
| if (vfsmnt->mnt_flags & MNT_RELATIME) { |
| if ((timespec_compare(&inode->i_atime, &inode->i_mtime) <= 0) || |
| (timespec_compare(&inode->i_atime, &inode->i_ctime) <= 0)) |
| return 1; |
| |
| return 0; |
| } |
| |
| now = CURRENT_TIME; |
| if ((now.tv_sec - inode->i_atime.tv_sec <= osb->s_atime_quantum)) |
| return 0; |
| else |
| return 1; |
| } |
| |
| int ocfs2_update_inode_atime(struct inode *inode, |
| struct buffer_head *bh) |
| { |
| int ret; |
| struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
| handle_t *handle; |
| struct ocfs2_dinode *di = (struct ocfs2_dinode *) bh->b_data; |
| |
| mlog_entry_void(); |
| |
| handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS); |
| if (IS_ERR(handle)) { |
| ret = PTR_ERR(handle); |
| mlog_errno(ret); |
| goto out; |
| } |
| |
| ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), bh, |
| OCFS2_JOURNAL_ACCESS_WRITE); |
| if (ret) { |
| mlog_errno(ret); |
| goto out_commit; |
| } |
| |
| /* |
| * Don't use ocfs2_mark_inode_dirty() here as we don't always |
| * have i_mutex to guard against concurrent changes to other |
| * inode fields. |
| */ |
| inode->i_atime = CURRENT_TIME; |
| di->i_atime = cpu_to_le64(inode->i_atime.tv_sec); |
| di->i_atime_nsec = cpu_to_le32(inode->i_atime.tv_nsec); |
| ocfs2_journal_dirty(handle, bh); |
| |
| out_commit: |
| ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle); |
| out: |
| mlog_exit(ret); |
| return ret; |
| } |
| |
| static int ocfs2_set_inode_size(handle_t *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_inode_sector_count(inode); |
| 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; |
| } |
| |
| 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); |
| handle_t *handle = NULL; |
| |
| handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS); |
| if (IS_ERR(handle)) { |
| ret = PTR_ERR(handle); |
| 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(osb, handle); |
| out: |
| return ret; |
| } |
| |
| static int ocfs2_cow_file_pos(struct inode *inode, |
| struct buffer_head *fe_bh, |
| u64 offset) |
| { |
| int status; |
| u32 phys, cpos = offset >> OCFS2_SB(inode->i_sb)->s_clustersize_bits; |
| unsigned int num_clusters = 0; |
| unsigned int ext_flags = 0; |
| |
| /* |
| * If the new offset is aligned to the range of the cluster, there is |
| * no space for ocfs2_zero_range_for_truncate to fill, so no need to |
| * CoW either. |
| */ |
| if ((offset & (OCFS2_SB(inode->i_sb)->s_clustersize - 1)) == 0) |
| return 0; |
| |
| status = ocfs2_get_clusters(inode, cpos, &phys, |
| &num_clusters, &ext_flags); |
| if (status) { |
| mlog_errno(status); |
| goto out; |
| } |
| |
| if (!(ext_flags & OCFS2_EXT_REFCOUNTED)) |
| goto out; |
| |
| return ocfs2_refcount_cow(inode, fe_bh, cpos, 1, cpos+1); |
| |
| out: |
| return status; |
| } |
| |
| static int ocfs2_orphan_for_truncate(struct ocfs2_super *osb, |
| struct inode *inode, |
| struct buffer_head *fe_bh, |
| u64 new_i_size) |
| { |
| int status; |
| handle_t *handle; |
| struct ocfs2_dinode *di; |
| u64 cluster_bytes; |
| |
| mlog_entry_void(); |
| |
| /* |
| * We need to CoW the cluster contains the offset if it is reflinked |
| * since we will call ocfs2_zero_range_for_truncate later which will |
| * write "0" from offset to the end of the cluster. |
| */ |
| status = ocfs2_cow_file_pos(inode, fe_bh, new_i_size); |
| if (status) { |
| mlog_errno(status); |
| return status; |
| } |
| |
| /* TODO: This needs to actually orphan the inode in this |
| * transaction. */ |
| |
| handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS); |
| if (IS_ERR(handle)) { |
| status = PTR_ERR(handle); |
| mlog_errno(status); |
| goto out; |
| } |
| |
| status = ocfs2_journal_access_di(handle, INODE_CACHE(inode), fe_bh, |
| OCFS2_JOURNAL_ACCESS_WRITE); |
| if (status < 0) { |
| mlog_errno(status); |
| goto out_commit; |
| } |
| |
| /* |
| * Do this before setting i_size. |
| */ |
| cluster_bytes = ocfs2_align_bytes_to_clusters(inode->i_sb, new_i_size); |
| status = ocfs2_zero_range_for_truncate(inode, handle, new_i_size, |
| cluster_bytes); |
| if (status) { |
| mlog_errno(status); |
| goto out_commit; |
| } |
| |
| i_size_write(inode, new_i_size); |
| inode->i_ctime = inode->i_mtime = CURRENT_TIME; |
| |
| di = (struct ocfs2_dinode *) fe_bh->b_data; |
| di->i_size = cpu_to_le64(new_i_size); |
| di->i_ctime = di->i_mtime = cpu_to_le64(inode->i_ctime.tv_sec); |
| di->i_ctime_nsec = di->i_mtime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec); |
| |
| ocfs2_journal_dirty(handle, fe_bh); |
| |
| out_commit: |
| ocfs2_commit_trans(osb, 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); |
| |
| /* We trust di_bh because it comes from ocfs2_inode_lock(), which |
| * already validated it */ |
| fe = (struct ocfs2_dinode *) di_bh->b_data; |
| |
| 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; |
| |
| down_write(&OCFS2_I(inode)->ip_alloc_sem); |
| |
| ocfs2_resv_discard(&osb->osb_la_resmap, |
| &OCFS2_I(inode)->ip_la_data_resv); |
| |
| /* |
| * The inode lock forced other nodes to sync and drop their |
| * pages, which (correctly) happens 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. |
| */ |
| unmap_mapping_range(inode->i_mapping, new_i_size + PAGE_SIZE - 1, 0, 1); |
| truncate_inode_pages(inode->i_mapping, new_i_size); |
| |
| if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) { |
| status = ocfs2_truncate_inline(inode, di_bh, new_i_size, |
| i_size_read(inode), 1); |
| if (status) |
| mlog_errno(status); |
| |
| goto bail_unlock_sem; |
| } |
| |
| /* 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_unlock_sem; |
| } |
| |
| status = ocfs2_prepare_truncate(osb, inode, di_bh, &tc); |
| if (status < 0) { |
| mlog_errno(status); |
| goto bail_unlock_sem; |
| } |
| |
| status = ocfs2_commit_truncate(osb, inode, di_bh, tc); |
| if (status < 0) { |
| mlog_errno(status); |
| goto bail_unlock_sem; |
| } |
| |
| /* TODO: orphan dir cleanup here. */ |
| bail_unlock_sem: |
| up_write(&OCFS2_I(inode)->ip_alloc_sem); |
| |
| bail: |
| if (!status && OCFS2_I(inode)->ip_clusters == 0) |
| status = ocfs2_try_remove_refcount_tree(inode, di_bh); |
| |
| mlog_exit(status); |
| return status; |
| } |
| |
| /* |
| * extend file 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_add_inode_data(struct ocfs2_super *osb, |
| struct inode *inode, |
| u32 *logical_offset, |
| u32 clusters_to_add, |
| int mark_unwritten, |
| struct buffer_head *fe_bh, |
| handle_t *handle, |
| struct ocfs2_alloc_context *data_ac, |
| struct ocfs2_alloc_context *meta_ac, |
| enum ocfs2_alloc_restarted *reason_ret) |
| { |
| int ret; |
| struct ocfs2_extent_tree et; |
| |
| ocfs2_init_dinode_extent_tree(&et, INODE_CACHE(inode), fe_bh); |
| ret = ocfs2_add_clusters_in_btree(handle, &et, logical_offset, |
| clusters_to_add, mark_unwritten, |
| data_ac, meta_ac, reason_ret); |
| |
| return ret; |
| } |
| |
| static int __ocfs2_extend_allocation(struct inode *inode, u32 logical_start, |
| u32 clusters_to_add, int mark_unwritten) |
| { |
| int status = 0; |
| int restart_func = 0; |
| int credits; |
| u32 prev_clusters; |
| struct buffer_head *bh = NULL; |
| struct ocfs2_dinode *fe = NULL; |
| handle_t *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); |
| struct ocfs2_extent_tree et; |
| int did_quota = 0; |
| |
| mlog_entry("(clusters_to_add = %u)\n", clusters_to_add); |
| |
| /* |
| * This function only exists for file systems which don't |
| * support holes. |
| */ |
| BUG_ON(mark_unwritten && !ocfs2_sparse_alloc(osb)); |
| |
| status = ocfs2_read_inode_block(inode, &bh); |
| if (status < 0) { |
| mlog_errno(status); |
| goto leave; |
| } |
| fe = (struct ocfs2_dinode *) bh->b_data; |
| |
| restart_all: |
| BUG_ON(le32_to_cpu(fe->i_clusters) != OCFS2_I(inode)->ip_clusters); |
| |
| mlog(0, "extend inode %llu, i_size = %lld, di->i_clusters = %u, " |
| "clusters_to_add = %u\n", |
| (unsigned long long)OCFS2_I(inode)->ip_blkno, |
| (long long)i_size_read(inode), le32_to_cpu(fe->i_clusters), |
| clusters_to_add); |
| ocfs2_init_dinode_extent_tree(&et, INODE_CACHE(inode), bh); |
| status = ocfs2_lock_allocators(inode, &et, clusters_to_add, 0, |
| &data_ac, &meta_ac); |
| if (status) { |
| mlog_errno(status); |
| goto leave; |
| } |
| |
| credits = ocfs2_calc_extend_credits(osb->sb, &fe->id2.i_list, |
| clusters_to_add); |
| handle = ocfs2_start_trans(osb, credits); |
| if (IS_ERR(handle)) { |
| status = PTR_ERR(handle); |
| handle = NULL; |
| mlog_errno(status); |
| goto leave; |
| } |
| |
| restarted_transaction: |
| status = dquot_alloc_space_nodirty(inode, |
| ocfs2_clusters_to_bytes(osb->sb, clusters_to_add)); |
| if (status) |
| goto leave; |
| did_quota = 1; |
| |
| /* 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_di(handle, INODE_CACHE(inode), bh, |
| OCFS2_JOURNAL_ACCESS_WRITE); |
| if (status < 0) { |
| mlog_errno(status); |
| goto leave; |
| } |
| |
| prev_clusters = OCFS2_I(inode)->ip_clusters; |
| |
| status = ocfs2_add_inode_data(osb, |
| inode, |
| &logical_start, |
| clusters_to_add, |
| mark_unwritten, |
| bh, |
| handle, |
| data_ac, |
| meta_ac, |
| &why); |
| if ((status < 0) && (status != -EAGAIN)) { |
| if (status != -ENOSPC) |
| mlog_errno(status); |
| goto leave; |
| } |
| |
| ocfs2_journal_dirty(handle, bh); |
| |
| spin_lock(&OCFS2_I(inode)->ip_lock); |
| clusters_to_add -= (OCFS2_I(inode)->ip_clusters - prev_clusters); |
| spin_unlock(&OCFS2_I(inode)->ip_lock); |
| /* Release unused quota reservation */ |
| dquot_free_space(inode, |
| ocfs2_clusters_to_bytes(osb->sb, clusters_to_add)); |
| did_quota = 0; |
| |
| 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->id2.i_list, |
| clusters_to_add); |
| status = ocfs2_extend_trans(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", |
| le32_to_cpu(fe->i_clusters), |
| (unsigned long long)le64_to_cpu(fe->i_size)); |
| mlog(0, "inode: ip_clusters=%u, i_size=%lld\n", |
| OCFS2_I(inode)->ip_clusters, (long long)i_size_read(inode)); |
| |
| leave: |
| if (status < 0 && did_quota) |
| dquot_free_space(inode, |
| ocfs2_clusters_to_bytes(osb->sb, clusters_to_add)); |
| if (handle) { |
| ocfs2_commit_trans(osb, 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; |
| } |
| 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 ->write_begin() and ->write_end(). */ |
| 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; |
| handle_t *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(OCFS2_SB(inode->i_sb), 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; |
| } |
| |
| int ocfs2_extend_no_holes(struct inode *inode, u64 new_i_size, u64 zero_to) |
| { |
| int ret; |
| u32 clusters_to_add; |
| struct ocfs2_inode_info *oi = OCFS2_I(inode); |
| |
| clusters_to_add = ocfs2_clusters_for_bytes(inode->i_sb, new_i_size); |
| if (clusters_to_add < oi->ip_clusters) |
| clusters_to_add = 0; |
| else |
| clusters_to_add -= oi->ip_clusters; |
| |
| if (clusters_to_add) { |
| ret = __ocfs2_extend_allocation(inode, oi->ip_clusters, |
| clusters_to_add, 0); |
| if (ret) { |
| mlog_errno(ret); |
| goto out; |
| } |
| } |
| |
| /* |
| * 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, zero_to); |
| if (ret < 0) |
| mlog_errno(ret); |
| |
| out: |
| return ret; |
| } |
| |
| static int ocfs2_extend_file(struct inode *inode, |
| struct buffer_head *di_bh, |
| u64 new_i_size) |
| { |
| int ret = 0; |
| struct ocfs2_inode_info *oi = OCFS2_I(inode); |
| |
| BUG_ON(!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)); |
| |
| /* |
| * Fall through for converting inline data, even if the fs |
| * supports sparse files. |
| * |
| * The check for inline data here is legal - nobody can add |
| * the feature since we have i_mutex. We must check it again |
| * after acquiring ip_alloc_sem though, as paths like mmap |
| * might have raced us to converting the inode to extents. |
| */ |
| if (!(oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) |
| && ocfs2_sparse_alloc(OCFS2_SB(inode->i_sb))) |
| goto out_update_size; |
| |
| /* |
| * The alloc sem blocks people 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. |
| */ |
| down_write(&oi->ip_alloc_sem); |
| |
| if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) { |
| /* |
| * We can optimize small extends by keeping the inodes |
| * inline data. |
| */ |
| if (ocfs2_size_fits_inline_data(di_bh, new_i_size)) { |
| up_write(&oi->ip_alloc_sem); |
| goto out_update_size; |
| } |
| |
| ret = ocfs2_convert_inline_data_to_extents(inode, di_bh); |
| if (ret) { |
| up_write(&oi->ip_alloc_sem); |
| |
| mlog_errno(ret); |
| goto out; |
| } |
| } |
| |
| if (!ocfs2_sparse_alloc(OCFS2_SB(inode->i_sb))) |
| ret = ocfs2_extend_no_holes(inode, new_i_size, new_i_size); |
| |
| up_write(&oi->ip_alloc_sem); |
| |
| if (ret < 0) { |
| mlog_errno(ret); |
| goto out; |
| } |
| |
| out_update_size: |
| ret = ocfs2_simple_size_update(inode, di_bh, new_i_size); |
| if (ret < 0) |
| mlog_errno(ret); |
| |
| 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; |
| handle_t *handle = NULL; |
| int qtype; |
| struct dquot *transfer_from[MAXQUOTAS] = { }; |
| struct dquot *transfer_to[MAXQUOTAS] = { }; |
| |
| mlog_entry("(0x%p, '%.*s')\n", dentry, |
| dentry->d_name.len, dentry->d_name.name); |
| |
| /* ensuring we don't even attempt to truncate a symlink */ |
| if (S_ISLNK(inode->i_mode)) |
| attr->ia_valid &= ~ATTR_SIZE; |
| |
| 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) { |
| dquot_initialize(inode); |
| |
| status = ocfs2_rw_lock(inode, 1); |
| if (status < 0) { |
| mlog_errno(status); |
| goto bail; |
| } |
| } |
| |
| status = ocfs2_inode_lock(inode, &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)) { |
| status = inode_newsize_ok(inode, attr->ia_size); |
| if (status) |
| goto bail_unlock; |
| |
| if (i_size_read(inode) > attr->ia_size) { |
| if (ocfs2_should_order_data(inode)) { |
| status = ocfs2_begin_ordered_truncate(inode, |
| attr->ia_size); |
| if (status) |
| goto bail_unlock; |
| } |
| status = ocfs2_truncate_file(inode, bh, attr->ia_size); |
| } else |
| status = ocfs2_extend_file(inode, bh, attr->ia_size); |
| if (status < 0) { |
| if (status != -ENOSPC) |
| mlog_errno(status); |
| status = -ENOSPC; |
| goto bail_unlock; |
| } |
| } |
| |
| if ((attr->ia_valid & ATTR_UID && attr->ia_uid != inode->i_uid) || |
| (attr->ia_valid & ATTR_GID && attr->ia_gid != inode->i_gid)) { |
| /* |
| * Gather pointers to quota structures so that allocation / |
| * freeing of quota structures happens here and not inside |
| * dquot_transfer() where we have problems with lock ordering |
| */ |
| if (attr->ia_valid & ATTR_UID && attr->ia_uid != inode->i_uid |
| && OCFS2_HAS_RO_COMPAT_FEATURE(sb, |
| OCFS2_FEATURE_RO_COMPAT_USRQUOTA)) { |
| transfer_to[USRQUOTA] = dqget(sb, attr->ia_uid, |
| USRQUOTA); |
| transfer_from[USRQUOTA] = dqget(sb, inode->i_uid, |
| USRQUOTA); |
| if (!transfer_to[USRQUOTA] || !transfer_from[USRQUOTA]) { |
| status = -ESRCH; |
| goto bail_unlock; |
| } |
| } |
| if (attr->ia_valid & ATTR_GID && attr->ia_gid != inode->i_gid |
| && OCFS2_HAS_RO_COMPAT_FEATURE(sb, |
| OCFS2_FEATURE_RO_COMPAT_GRPQUOTA)) { |
| transfer_to[GRPQUOTA] = dqget(sb, attr->ia_gid, |
| GRPQUOTA); |
| transfer_from[GRPQUOTA] = dqget(sb, inode->i_gid, |
| GRPQUOTA); |
| if (!transfer_to[GRPQUOTA] || !transfer_from[GRPQUOTA]) { |
| status = -ESRCH; |
| goto bail_unlock; |
| } |
| } |
| handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS + |
| 2 * ocfs2_quota_trans_credits(sb)); |
| if (IS_ERR(handle)) { |
| status = PTR_ERR(handle); |
| mlog_errno(status); |
| goto bail_unlock; |
| } |
| status = dquot_transfer(inode, attr); |
| if (status < 0) |
| goto bail_commit; |
| } else { |
| handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS); |
| if (IS_ERR(handle)) { |
| status = PTR_ERR(handle); |
| mlog_errno(status); |
| goto bail_unlock; |
| } |
| } |
| |
| /* |
| * This will intentionally not wind up calling vmtruncate(), |
| * since all the work for a size change has been done above. |
| * Otherwise, we could get into problems with truncate as |
| * ip_alloc_sem is used there to protect against i_size |
| * changes. |
| */ |
| 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(osb, handle); |
| bail_unlock: |
| ocfs2_inode_unlock(inode, 1); |
| bail_unlock_rw: |
| if (size_change) |
| ocfs2_rw_unlock(inode, 1); |
| bail: |
| brelse(bh); |
| |
| /* Release quota pointers in case we acquired them */ |
| for (qtype = 0; qtype < MAXQUOTAS; qtype++) { |
| dqput(transfer_to[qtype]); |
| dqput(transfer_from[qtype]); |
| } |
| |
| if (!status && attr->ia_valid & ATTR_MODE) { |
| status = ocfs2_acl_chmod(inode); |
| if (status < 0) |
| mlog_errno(status); |
| } |
| |
| 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; |
| } |
| |
| int ocfs2_permission(struct inode *inode, int mask) |
| { |
| int ret; |
| |
| mlog_entry_void(); |
| |
| ret = ocfs2_inode_lock(inode, NULL, 0); |
| if (ret) { |
| if (ret != -ENOENT) |
| mlog_errno(ret); |
| goto out; |
| } |
| |
| ret = generic_permission(inode, mask, ocfs2_check_acl); |
| |
| ocfs2_inode_unlock(inode, 0); |
| out: |
| mlog_exit(ret); |
| return ret; |
| } |
| |
| static int __ocfs2_write_remove_suid(struct inode *inode, |
| struct buffer_head *bh) |
| { |
| int ret; |
| handle_t *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)OCFS2_I(inode)->ip_blkno, inode->i_mode); |
| |
| handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS); |
| if (IS_ERR(handle)) { |
| ret = PTR_ERR(handle); |
| mlog_errno(ret); |
| goto out; |
| } |
| |
| ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), bh, |
| OCFS2_JOURNAL_ACCESS_WRITE); |
| if (ret < 0) { |
| mlog_errno(ret); |
| goto out_trans; |
| } |
| |
| 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); |
| |
| ocfs2_journal_dirty(handle, bh); |
| |
| out_trans: |
| ocfs2_commit_trans(osb, handle); |
| out: |
| mlog_exit(ret); |
| return ret; |
| } |
| |
| /* |
| * Will look for holes and unwritten extents in the range starting at |
| * pos for count bytes (inclusive). |
| */ |
| static int ocfs2_check_range_for_holes(struct inode *inode, loff_t pos, |
| size_t count) |
| { |
| int ret = 0; |
| unsigned int extent_flags; |
| u32 cpos, clusters, extent_len, phys_cpos; |
| struct super_block *sb = inode->i_sb; |
| |
| cpos = pos >> OCFS2_SB(sb)->s_clustersize_bits; |
| clusters = ocfs2_clusters_for_bytes(sb, pos + count) - cpos; |
| |
| while (clusters) { |
| ret = ocfs2_get_clusters(inode, cpos, &phys_cpos, &extent_len, |
| &extent_flags); |
| if (ret < 0) { |
| mlog_errno(ret); |
| goto out; |
| } |
| |
| if (phys_cpos == 0 || (extent_flags & OCFS2_EXT_UNWRITTEN)) { |
| ret = 1; |
| break; |
| } |
| |
| if (extent_len > clusters) |
| extent_len = clusters; |
| |
| clusters -= extent_len; |
| cpos += extent_len; |
| } |
| out: |
| return ret; |
| } |
| |
| static int ocfs2_write_remove_suid(struct inode *inode) |
| { |
| int ret; |
| struct buffer_head *bh = NULL; |
| |
| ret = ocfs2_read_inode_block(inode, &bh); |
| if (ret < 0) { |
| mlog_errno(ret); |
| goto out; |
| } |
| |
| ret = __ocfs2_write_remove_suid(inode, bh); |
| out: |
| brelse(bh); |
| return ret; |
| } |
| |
| /* |
| * Allocate enough extents to cover the region starting at byte offset |
| * start for len bytes. Existing extents are skipped, any extents |
| * added are marked as "unwritten". |
| */ |
| static int ocfs2_allocate_unwritten_extents(struct inode *inode, |
| u64 start, u64 len) |
| { |
| int ret; |
| u32 cpos, phys_cpos, clusters, alloc_size; |
| u64 end = start + len; |
| struct buffer_head *di_bh = NULL; |
| |
| if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) { |
| ret = ocfs2_read_inode_block(inode, &di_bh); |
| if (ret) { |
| mlog_errno(ret); |
| goto out; |
| } |
| |
| /* |
| * Nothing to do if the requested reservation range |
| * fits within the inode. |
| */ |
| if (ocfs2_size_fits_inline_data(di_bh, end)) |
| goto out; |
| |
| ret = ocfs2_convert_inline_data_to_extents(inode, di_bh); |
| if (ret) { |
| mlog_errno(ret); |
| goto out; |
| } |
| } |
| |
| /* |
| * We consider both start and len to be inclusive. |
| */ |
| cpos = start >> OCFS2_SB(inode->i_sb)->s_clustersize_bits; |
| clusters = ocfs2_clusters_for_bytes(inode->i_sb, start + len); |
| clusters -= cpos; |
| |
| while (clusters) { |
| ret = ocfs2_get_clusters(inode, cpos, &phys_cpos, |
| &alloc_size, NULL); |
| if (ret) { |
| mlog_errno(ret); |
| goto out; |
| } |
| |
| /* |
| * Hole or existing extent len can be arbitrary, so |
| * cap it to our own allocation request. |
| */ |
| if (alloc_size > clusters) |
| alloc_size = clusters; |
| |
| if (phys_cpos) { |
| /* |
| * We already have an allocation at this |
| * region so we can safely skip it. |
| */ |
| goto next; |
| } |
| |
| ret = __ocfs2_extend_allocation(inode, cpos, alloc_size, 1); |
| if (ret) { |
| if (ret != -ENOSPC) |
| mlog_errno(ret); |
| goto out; |
| } |
| |
| next: |
| cpos += alloc_size; |
| clusters -= alloc_size; |
| } |
| |
| ret = 0; |
| out: |
| |
| brelse(di_bh); |
| return ret; |
| } |
| |
| /* |
| * Truncate a byte range, avoiding pages within partial clusters. This |
| * preserves those pages for the zeroing code to write to. |
| */ |
| static void ocfs2_truncate_cluster_pages(struct inode *inode, u64 byte_start, |
| u64 byte_len) |
| { |
| struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
| loff_t start, end; |
| struct address_space *mapping = inode->i_mapping; |
| |
| start = (loff_t)ocfs2_align_bytes_to_clusters(inode->i_sb, byte_start); |
| end = byte_start + byte_len; |
| end = end & ~(osb->s_clustersize - 1); |
| |
| if (start < end) { |
| unmap_mapping_range(mapping, start, end - start, 0); |
| truncate_inode_pages_range(mapping, start, end - 1); |
| } |
| } |
| |
| static int ocfs2_zero_partial_clusters(struct inode *inode, |
| u64 start, u64 len) |
| { |
| int ret = 0; |
| u64 tmpend, end = start + len; |
| struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
| unsigned int csize = osb->s_clustersize; |
| handle_t *handle; |
| |
| /* |
| * The "start" and "end" values are NOT necessarily part of |
| * the range whose allocation is being deleted. Rather, this |
| * is what the user passed in with the request. We must zero |
| * partial clusters here. There's no need to worry about |
| * physical allocation - the zeroing code knows to skip holes. |
| */ |
| mlog(0, "byte start: %llu, end: %llu\n", |
| (unsigned long long)start, (unsigned long long)end); |
| |
| /* |
| * If both edges are on a cluster boundary then there's no |
| * zeroing required as the region is part of the allocation to |
| * be truncated. |
| */ |
| if ((start & (csize - 1)) == 0 && (end & (csize - 1)) == 0) |
| goto out; |
| |
| handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS); |
| if (IS_ERR(handle)) { |
| ret = PTR_ERR(handle); |
| mlog_errno(ret); |
| goto out; |
| } |
| |
| /* |
| * We want to get the byte offset of the end of the 1st cluster. |
| */ |
| tmpend = (u64)osb->s_clustersize + (start & ~(osb->s_clustersize - 1)); |
| if (tmpend > end) |
| tmpend = end; |
| |
| mlog(0, "1st range: start: %llu, tmpend: %llu\n", |
| (unsigned long long)start, (unsigned long long)tmpend); |
| |
| ret = ocfs2_zero_range_for_truncate(inode, handle, start, tmpend); |
| if (ret) |
| mlog_errno(ret); |
| |
| if (tmpend < end) { |
| /* |
| * This may make start and end equal, but the zeroing |
| * code will skip any work in that case so there's no |
| * need to catch it up here. |
| */ |
| start = end & ~(osb->s_clustersize - 1); |
| |
| mlog(0, "2nd range: start: %llu, end: %llu\n", |
| (unsigned long long)start, (unsigned long long)end); |
| |
| ret = ocfs2_zero_range_for_truncate(inode, handle, start, end); |
| if (ret) |
| mlog_errno(ret); |
| } |
| |
| ocfs2_commit_trans(osb, handle); |
| out: |
| return ret; |
| } |
| |
| static int ocfs2_remove_inode_range(struct inode *inode, |
| struct buffer_head *di_bh, u64 byte_start, |
| u64 byte_len) |
| { |
| int ret = 0; |
| u32 trunc_start, trunc_len, cpos, phys_cpos, alloc_size; |
| struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
| struct ocfs2_cached_dealloc_ctxt dealloc; |
| struct address_space *mapping = inode->i_mapping; |
| struct ocfs2_extent_tree et; |
| |
| ocfs2_init_dinode_extent_tree(&et, INODE_CACHE(inode), di_bh); |
| ocfs2_init_dealloc_ctxt(&dealloc); |
| |
| if (byte_len == 0) |
| return 0; |
| |
| if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) { |
| ret = ocfs2_truncate_inline(inode, di_bh, byte_start, |
| byte_start + byte_len, 0); |
| if (ret) { |
| mlog_errno(ret); |
| goto out; |
| } |
| /* |
| * There's no need to get fancy with the page cache |
| * truncate of an inline-data inode. We're talking |
| * about less than a page here, which will be cached |
| * in the dinode buffer anyway. |
| */ |
| unmap_mapping_range(mapping, 0, 0, 0); |
| truncate_inode_pages(mapping, 0); |
| goto out; |
| } |
| |
| trunc_start = ocfs2_clusters_for_bytes(osb->sb, byte_start); |
| trunc_len = (byte_start + byte_len) >> osb->s_clustersize_bits; |
| if (trunc_len >= trunc_start) |
| trunc_len -= trunc_start; |
| else |
| trunc_len = 0; |
| |
| mlog(0, "Inode: %llu, start: %llu, len: %llu, cstart: %u, clen: %u\n", |
| (unsigned long long)OCFS2_I(inode)->ip_blkno, |
| (unsigned long long)byte_start, |
| (unsigned long long)byte_len, trunc_start, trunc_len); |
| |
| ret = ocfs2_zero_partial_clusters(inode, byte_start, byte_len); |
| if (ret) { |
| mlog_errno(ret); |
| goto out; |
| } |
| |
| cpos = trunc_start; |
| while (trunc_len) { |
| ret = ocfs2_get_clusters(inode, cpos, &phys_cpos, |
| &alloc_size, NULL); |
| if (ret) { |
| mlog_errno(ret); |
| goto out; |
| } |
| |
| if (alloc_size > trunc_len) |
| alloc_size = trunc_len; |
| |
| /* Only do work for non-holes */ |
| if (phys_cpos != 0) { |
| ret = ocfs2_remove_btree_range(inode, &et, cpos, |
| phys_cpos, alloc_size, |
| &dealloc); |
| if (ret) { |
| mlog_errno(ret); |
| goto out; |
| } |
| } |
| |
| cpos += alloc_size; |
| trunc_len -= alloc_size; |
| } |
| |
| ocfs2_truncate_cluster_pages(inode, byte_start, byte_len); |
| |
| out: |
| ocfs2_schedule_truncate_log_flush(osb, 1); |
| ocfs2_run_deallocs(osb, &dealloc); |
| |
| return ret; |
| } |
| |
| /* |
| * Parts of this function taken from xfs_change_file_space() |
| */ |
| static int __ocfs2_change_file_space(struct file *file, struct inode *inode, |
| loff_t f_pos, unsigned int cmd, |
| struct ocfs2_space_resv *sr, |
| int change_size) |
| { |
| int ret; |
| s64 llen; |
| loff_t size; |
| struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
| struct buffer_head *di_bh = NULL; |
| handle_t *handle; |
| unsigned long long max_off = inode->i_sb->s_maxbytes; |
| |
| if (ocfs2_is_hard_readonly(osb) || ocfs2_is_soft_readonly(osb)) |
| return -EROFS; |
| |
| mutex_lock(&inode->i_mutex); |
| |
| /* |
| * This prevents concurrent writes on other nodes |
| */ |
| ret = ocfs2_rw_lock(inode, 1); |
| if (ret) { |
| mlog_errno(ret); |
| goto out; |
| } |
| |
| ret = ocfs2_inode_lock(inode, &di_bh, 1); |
| if (ret) { |
| mlog_errno(ret); |
| goto out_rw_unlock; |
| } |
| |
| if (inode->i_flags & (S_IMMUTABLE|S_APPEND)) { |
| ret = -EPERM; |
| goto out_inode_unlock; |
| } |
| |
| switch (sr->l_whence) { |
| case 0: /*SEEK_SET*/ |
| break; |
| case 1: /*SEEK_CUR*/ |
| sr->l_start += f_pos; |
| break; |
| case 2: /*SEEK_END*/ |
| sr->l_start += i_size_read(inode); |
| break; |
| default: |
| ret = -EINVAL; |
| goto out_inode_unlock; |
| } |
| sr->l_whence = 0; |
| |
| llen = sr->l_len > 0 ? sr->l_len - 1 : sr->l_len; |
| |
| if (sr->l_start < 0 |
| || sr->l_start > max_off |
| || (sr->l_start + llen) < 0 |
| || (sr->l_start + llen) > max_off) { |
| ret = -EINVAL; |
| goto out_inode_unlock; |
| } |
| size = sr->l_start + sr->l_len; |
| |
| if (cmd == OCFS2_IOC_RESVSP || cmd == OCFS2_IOC_RESVSP64) { |
| if (sr->l_len <= 0) { |
| ret = -EINVAL; |
| goto out_inode_unlock; |
| } |
| } |
| |
| if (file && should_remove_suid(file->f_path.dentry)) { |
| ret = __ocfs2_write_remove_suid(inode, di_bh); |
| if (ret) { |
| mlog_errno(ret); |
| goto out_inode_unlock; |
| } |
| } |
| |
| down_write(&OCFS2_I(inode)->ip_alloc_sem); |
| switch (cmd) { |
| case OCFS2_IOC_RESVSP: |
| case OCFS2_IOC_RESVSP64: |
| /* |
| * This takes unsigned offsets, but the signed ones we |
| * pass have been checked against overflow above. |
| */ |
| ret = ocfs2_allocate_unwritten_extents(inode, sr->l_start, |
| sr->l_len); |
| break; |
| case OCFS2_IOC_UNRESVSP: |
| case OCFS2_IOC_UNRESVSP64: |
| ret = ocfs2_remove_inode_range(inode, di_bh, sr->l_start, |
| sr->l_len); |
| break; |
| default: |
| ret = -EINVAL; |
| } |
| up_write(&OCFS2_I(inode)->ip_alloc_sem); |
| if (ret) { |
| mlog_errno(ret); |
| goto out_inode_unlock; |
| } |
| |
| /* |
| * We update c/mtime for these changes |
| */ |
| handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS); |
| if (IS_ERR(handle)) { |
| ret = PTR_ERR(handle); |
| mlog_errno(ret); |
| goto out_inode_unlock; |
| } |
| |
| if (change_size && i_size_read(inode) < size) |
| i_size_write(inode, size); |
| |
| inode->i_ctime = inode->i_mtime = CURRENT_TIME; |
| ret = ocfs2_mark_inode_dirty(handle, inode, di_bh); |
| if (ret < 0) |
| mlog_errno(ret); |
| |
| ocfs2_commit_trans(osb, handle); |
| |
| out_inode_unlock: |
| brelse(di_bh); |
| ocfs2_inode_unlock(inode, 1); |
| out_rw_unlock: |
| ocfs2_rw_unlock(inode, 1); |
| |
| out: |
| mutex_unlock(&inode->i_mutex); |
| return ret; |
| } |
| |
| int ocfs2_change_file_space(struct file *file, unsigned int cmd, |
| struct ocfs2_space_resv *sr) |
| { |
| struct inode *inode = file->f_path.dentry->d_inode; |
| struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
| |
| if ((cmd == OCFS2_IOC_RESVSP || cmd == OCFS2_IOC_RESVSP64) && |
| !ocfs2_writes_unwritten_extents(osb)) |
| return -ENOTTY; |
| else if ((cmd == OCFS2_IOC_UNRESVSP || cmd == OCFS2_IOC_UNRESVSP64) && |
| !ocfs2_sparse_alloc(osb)) |
| return -ENOTTY; |
| |
| if (!S_ISREG(inode->i_mode)) |
| return -EINVAL; |
| |
| if (!(file->f_mode & FMODE_WRITE)) |
| return -EBADF; |
| |
| return __ocfs2_change_file_space(file, inode, file->f_pos, cmd, sr, 0); |
| } |
| |
| static long ocfs2_fallocate(struct inode *inode, int mode, loff_t offset, |
| loff_t len) |
| { |
| struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
| struct ocfs2_space_resv sr; |
| int change_size = 1; |
| |
| if (!ocfs2_writes_unwritten_extents(osb)) |
| return -EOPNOTSUPP; |
| |
| if (S_ISDIR(inode->i_mode)) |
| return -ENODEV; |
| |
| if (mode & FALLOC_FL_KEEP_SIZE) |
| change_size = 0; |
| |
| sr.l_whence = 0; |
| sr.l_start = (s64)offset; |
| sr.l_len = (s64)len; |
| |
| return __ocfs2_change_file_space(NULL, inode, offset, |
| OCFS2_IOC_RESVSP64, &sr, change_size); |
| } |
| |
| int ocfs2_check_range_for_refcount(struct inode *inode, loff_t pos, |
| size_t count) |
| { |
| int ret = 0; |
| unsigned int extent_flags; |
| u32 cpos, clusters, extent_len, phys_cpos; |
| struct super_block *sb = inode->i_sb; |
| |
| if (!ocfs2_refcount_tree(OCFS2_SB(inode->i_sb)) || |
| !(OCFS2_I(inode)->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL) || |
| OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) |
| return 0; |
| |
| cpos = pos >> OCFS2_SB(sb)->s_clustersize_bits; |
| clusters = ocfs2_clusters_for_bytes(sb, pos + count) - cpos; |
| |
| while (clusters) { |
| ret = ocfs2_get_clusters(inode, cpos, &phys_cpos, &extent_len, |
| &extent_flags); |
| if (ret < 0) { |
| mlog_errno(ret); |
| goto out; |
| } |
| |
| if (phys_cpos && (extent_flags & OCFS2_EXT_REFCOUNTED)) { |
| ret = 1; |
| break; |
| } |
| |
| if (extent_len > clusters) |
| extent_len = clusters; |
| |
| clusters -= extent_len; |
| cpos += extent_len; |
| } |
| out: |
| return ret; |
| } |
| |
| static int ocfs2_prepare_inode_for_refcount(struct inode *inode, |
| loff_t pos, size_t count, |
| int *meta_level) |
| { |
| int ret; |
| struct buffer_head *di_bh = NULL; |
| u32 cpos = pos >> OCFS2_SB(inode->i_sb)->s_clustersize_bits; |
| u32 clusters = |
| ocfs2_clusters_for_bytes(inode->i_sb, pos + count) - cpos; |
| |
| ret = ocfs2_inode_lock(inode, &di_bh, 1); |
| if (ret) { |
| mlog_errno(ret); |
| goto out; |
| } |
| |
| *meta_level = 1; |
| |
| ret = ocfs2_refcount_cow(inode, di_bh, cpos, clusters, UINT_MAX); |
| if (ret) |
| mlog_errno(ret); |
| out: |
| brelse(di_bh); |
| return ret; |
| } |
| |
| static int ocfs2_prepare_inode_for_write(struct dentry *dentry, |
| loff_t *ppos, |
| size_t count, |
| int appending, |
| int *direct_io, |
| int *has_refcount) |
| { |
| int ret = 0, meta_level = 0; |
| struct inode *inode = dentry->d_inode; |
| loff_t saved_pos, end; |
| |
| /* |
| * We start with a read level meta lock and only jump to an ex |
| * if we need to make modifications here. |
| */ |
| for(;;) { |
| ret = ocfs2_inode_lock(inode, 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 (should_remove_suid(dentry)) { |
| if (meta_level == 0) { |
| ocfs2_inode_unlock(inode, meta_level); |
| meta_level = 1; |
| continue; |
| } |
| |
| ret = ocfs2_write_remove_suid(inode); |
| if (ret < 0) { |
| mlog_errno(ret); |
| goto out_unlock; |
| } |
| } |
| |
| /* work on a copy of ppos until we're sure that we won't have |
| * to recalculate it due to relocking. */ |
| if (appending) { |
| saved_pos = i_size_read(inode); |
| mlog(0, "O_APPEND: inode->i_size=%llu\n", saved_pos); |
| } else { |
| saved_pos = *ppos; |
| } |
| |
| end = saved_pos + count; |
| |
| ret = ocfs2_check_range_for_refcount(inode, saved_pos, count); |
| if (ret == 1) { |
| ocfs2_inode_unlock(inode, meta_level); |
| meta_level = -1; |
| |
| ret = ocfs2_prepare_inode_for_refcount(inode, |
| saved_pos, |
| count, |
| &meta_level); |
| if (has_refcount) |
| *has_refcount = 1; |
| if (direct_io) |
| *direct_io = 0; |
| } |
| |
| if (ret < 0) { |
| mlog_errno(ret); |
| goto out_unlock; |
| } |
| |
| /* |
| * Skip the O_DIRECT checks if we don't need |
| * them. |
| */ |
| if (!direct_io || !(*direct_io)) |
| break; |
| |
| /* |
| * There's no sane way to do direct writes to an inode |
| * with inline data. |
| */ |
| if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) { |
| *direct_io = 0; |
| break; |
| } |
| |
| /* |
| * Allowing concurrent direct writes means |
| * i_size changes wouldn't be synchronized, so |
| * one node could wind up truncating another |
| * nodes writes. |
| */ |
| if (end > i_size_read(inode)) { |
| *direct_io = 0; |
| break; |
| } |
| |
| /* |
| * We don't fill holes during direct io, so |
| * check for them here. If any are found, the |
| * caller will have to retake some cluster |
| * locks and initiate the io as buffered. |
| */ |
| ret = ocfs2_check_range_for_holes(inode, saved_pos, count); |
| if (ret == 1) { |
| *direct_io = 0; |
| ret = 0; |
| } else if (ret < 0) |
| mlog_errno(ret); |
| break; |
| } |
| |
| if (appending) |
| *ppos = saved_pos; |
| |
| out_unlock: |
| if (meta_level >= 0) |
| ocfs2_inode_unlock(inode, meta_level); |
| |
| out: |
| return ret; |
| } |
| |
| static ssize_t ocfs2_file_aio_write(struct kiocb *iocb, |
| const struct iovec *iov, |
| unsigned long nr_segs, |
| loff_t pos) |
| { |
| int ret, direct_io, appending, rw_level, have_alloc_sem = 0; |
| int can_do_direct, has_refcount = 0; |
| ssize_t written = 0; |
| size_t ocount; /* original count */ |
| size_t count; /* after file limit checks */ |
| loff_t old_size, *ppos = &iocb->ki_pos; |
| u32 old_clusters; |
| struct file *file = iocb->ki_filp; |
| struct inode *inode = file->f_path.dentry->d_inode; |
| struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
| |
| mlog_entry("(0x%p, %u, '%.*s')\n", file, |
| (unsigned int)nr_segs, |
| file->f_path.dentry->d_name.len, |
| file->f_path.dentry->d_name.name); |
| |
| if (iocb->ki_left == 0) |
| return 0; |
| |
| vfs_check_frozen(inode->i_sb, SB_FREEZE_WRITE); |
| |
| appending = file->f_flags & O_APPEND ? 1 : 0; |
| direct_io = file->f_flags & O_DIRECT ? 1 : 0; |
| |
| mutex_lock(&inode->i_mutex); |
| |
| relock: |
| /* to match setattr's i_mutex -> i_alloc_sem -> rw_lock ordering */ |
| if (direct_io) { |
| down_read(&inode->i_alloc_sem); |
| have_alloc_sem = 1; |
| } |
| |
| /* concurrent O_DIRECT writes are allowed */ |
| rw_level = !direct_io; |
| ret = ocfs2_rw_lock(inode, rw_level); |
| if (ret < 0) { |
| mlog_errno(ret); |
| goto out_sems; |
| } |
| |
| can_do_direct = direct_io; |
| ret = ocfs2_prepare_inode_for_write(file->f_path.dentry, ppos, |
| iocb->ki_left, appending, |
| &can_do_direct, &has_refcount); |
| if (ret < 0) { |
| mlog_errno(ret); |
| goto out; |
| } |
| |
| /* |
| * We can't complete the direct I/O as requested, fall back to |
| * buffered I/O. |
| */ |
| if (direct_io && !can_do_direct) { |
| ocfs2_rw_unlock(inode, rw_level); |
| up_read(&inode->i_alloc_sem); |
| |
| have_alloc_sem = 0; |
| rw_level = -1; |
| |
| direct_io = 0; |
| goto relock; |
| } |
| |
| /* |
| * To later detect whether a journal commit for sync writes is |
| * necessary, we sample i_size, and cluster count here. |
| */ |
| old_size = i_size_read(inode); |
| old_clusters = OCFS2_I(inode)->ip_clusters; |
| |
| /* communicate with ocfs2_dio_end_io */ |
| ocfs2_iocb_set_rw_locked(iocb, rw_level); |
| |
| if (direct_io) { |
| ret = generic_segment_checks(iov, &nr_segs, &ocount, |
| VERIFY_READ); |
| if (ret) |
| goto out_dio; |
| |
| count = ocount; |
| ret = generic_write_checks(file, ppos, &count, |
| S_ISBLK(inode->i_mode)); |
| if (ret) |
| goto out_dio; |
| |
| written = generic_file_direct_write(iocb, iov, &nr_segs, *ppos, |
| ppos, count, ocount); |
| if (written < 0) { |
| /* |
| * direct write may have instantiated a few |
| * blocks outside i_size. Trim these off again. |
| * Don't need i_size_read because we hold i_mutex. |
| */ |
| if (*ppos + count > inode->i_size) |
| vmtruncate(inode, inode->i_size); |
| ret = written; |
| goto out_dio; |
| } |
| } else { |
| written = __generic_file_aio_write(iocb, iov, nr_segs, ppos); |
| } |
| |
| out_dio: |
| /* buffered aio wouldn't have proper lock coverage today */ |
| BUG_ON(ret == -EIOCBQUEUED && !(file->f_flags & O_DIRECT)); |
| |
| if (((file->f_flags & O_DSYNC) && !direct_io) || IS_SYNC(inode) || |
| ((file->f_flags & O_DIRECT) && has_refcount)) { |
| ret = filemap_fdatawrite_range(file->f_mapping, pos, |
| pos + count - 1); |
| if (ret < 0) |
| written = ret; |
| |
| if (!ret && (old_size != i_size_read(inode) || |
| old_clusters != OCFS2_I(inode)->ip_clusters || |
| has_refcount)) { |
| ret = jbd2_journal_force_commit(osb->journal->j_journal); |
| if (ret < 0) |
| written = ret; |
| } |
| |
| if (!ret) |
| ret = filemap_fdatawait_range(file->f_mapping, pos, |
| pos + count - 1); |
| } |
| |
| /* |
| * 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 (rw_level != -1) |
| ocfs2_rw_unlock(inode, rw_level); |
| |
| out_sems: |
| if (have_alloc_sem) |
| up_read(&inode->i_alloc_sem); |
| |
| mutex_unlock(&inode->i_mutex); |
| |
| if (written) |
| ret = written; |
| mlog_exit(ret); |
| return ret; |
| } |
| |
| static int ocfs2_splice_to_file(struct pipe_inode_info *pipe, |
| struct file *out, |
| struct splice_desc *sd) |
| { |
| int ret; |
| |
| ret = ocfs2_prepare_inode_for_write(out->f_path.dentry, &sd->pos, |
| sd->total_len, 0, NULL, NULL); |
| if (ret < 0) { |
| mlog_errno(ret); |
| return ret; |
| } |
| |
| return splice_from_pipe_feed(pipe, sd, pipe_to_file); |
| } |
| |
| static ssize_t ocfs2_file_splice_write(struct pipe_inode_info *pipe, |
| struct file *out, |
| loff_t *ppos, |
| size_t len, |
| unsigned int flags) |
| { |
| int ret; |
| struct address_space *mapping = out->f_mapping; |
| struct inode *inode = mapping->host; |
| struct splice_desc sd = { |
| .total_len = len, |
| .flags = flags, |
| .pos = *ppos, |
| .u.file = out, |
| }; |
| |
| mlog_entry("(0x%p, 0x%p, %u, '%.*s')\n", out, pipe, |
| (unsigned int)len, |
| out->f_path.dentry->d_name.len, |
| out->f_path.dentry->d_name.name); |
| |
| if (pipe->inode) |
| mutex_lock_nested(&pipe->inode->i_mutex, I_MUTEX_PARENT); |
| |
| splice_from_pipe_begin(&sd); |
| do { |
| ret = splice_from_pipe_next(pipe, &sd); |
| if (ret <= 0) |
| break; |
| |
| mutex_lock_nested(&inode->i_mutex, I_MUTEX_CHILD); |
| ret = ocfs2_rw_lock(inode, 1); |
| if (ret < 0) |
| mlog_errno(ret); |
| else { |
| ret = ocfs2_splice_to_file(pipe, out, &sd); |
| ocfs2_rw_unlock(inode, 1); |
| } |
| mutex_unlock(&inode->i_mutex); |
| } while (ret > 0); |
| splice_from_pipe_end(pipe, &sd); |
| |
| if (pipe->inode) |
| mutex_unlock(&pipe->inode->i_mutex); |
| |
| if (sd.num_spliced) |
| ret = sd.num_spliced; |
| |
| if (ret > 0) { |
| unsigned long nr_pages; |
| int err; |
| |
| nr_pages = (ret + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; |
| |
| err = generic_write_sync(out, *ppos, ret); |
| if (err) |
| ret = err; |
| else |
| *ppos += ret; |
| |
| balance_dirty_pages_ratelimited_nr(mapping, nr_pages); |
| } |
| |
| mlog_exit(ret); |
| return ret; |
| } |
| |
| static ssize_t ocfs2_file_splice_read(struct file *in, |
| loff_t *ppos, |
| struct pipe_inode_info *pipe, |
| size_t len, |
| unsigned int flags) |
| { |
| int ret = 0, lock_level = 0; |
| struct inode *inode = in->f_path.dentry->d_inode; |
| |
| mlog_entry("(0x%p, 0x%p, %u, '%.*s')\n", in, pipe, |
| (unsigned int)len, |
| in->f_path.dentry->d_name.len, |
| in->f_path.dentry->d_name.name); |
| |
| /* |
| * See the comment in ocfs2_file_aio_read() |
| */ |
| ret = ocfs2_inode_lock_atime(inode, in->f_vfsmnt, &lock_level); |
| if (ret < 0) { |
| mlog_errno(ret); |
| goto bail; |
| } |
| ocfs2_inode_unlock(inode, lock_level); |
| |
| ret = generic_file_splice_read(in, ppos, pipe, len, flags); |
| |
| bail: |
| 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, lock_level = 0; |
| struct file *filp = iocb->ki_filp; |
| struct inode *inode = filp->f_path.dentry->d_inode; |
| |
| mlog_entry("(0x%p, %u, '%.*s')\n", filp, |
| (unsigned int)nr_segs, |
| filp->f_path.dentry->d_name.len, |
| filp->f_path.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, rw_level); |
| } |
| |
| /* |
| * 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_inode_lock_atime(inode, filp->f_vfsmnt, &lock_level); |
| if (ret < 0) { |
| mlog_errno(ret); |
| goto bail; |
| } |
| ocfs2_inode_unlock(inode, lock_level); |
| |
| ret = generic_file_aio_read(iocb, iov, nr_segs, iocb->ki_pos); |
| if (ret == -EINVAL) |
| mlog(0, "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; |
| } |
| |
| const struct inode_operations ocfs2_file_iops = { |
| .setattr = ocfs2_setattr, |
| .getattr = ocfs2_getattr, |
| .permission = ocfs2_permission, |
| .setxattr = generic_setxattr, |
| .getxattr = generic_getxattr, |
| .listxattr = ocfs2_listxattr, |
| .removexattr = generic_removexattr, |
| .fallocate = ocfs2_fallocate, |
| .fiemap = ocfs2_fiemap, |
| }; |
| |
| const struct inode_operations ocfs2_special_file_iops = { |
| .setattr = ocfs2_setattr, |
| .getattr = ocfs2_getattr, |
| .permission = ocfs2_permission, |
| }; |
| |
| /* |
| * Other than ->lock, keep ocfs2_fops and ocfs2_dops in sync with |
| * ocfs2_fops_no_plocks and ocfs2_dops_no_plocks! |
| */ |
| const struct file_operations ocfs2_fops = { |
| .llseek = generic_file_llseek, |
| .read = do_sync_read, |
| .write = do_sync_write, |
| .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, |
| .unlocked_ioctl = ocfs2_ioctl, |
| #ifdef CONFIG_COMPAT |
| .compat_ioctl = ocfs2_compat_ioctl, |
| #endif |
| .lock = ocfs2_lock, |
| .flock = ocfs2_flock, |
| .splice_read = ocfs2_file_splice_read, |
| .splice_write = ocfs2_file_splice_write, |
| }; |
| |
| const struct file_operations ocfs2_dops = { |
| .llseek = generic_file_llseek, |
| .read = generic_read_dir, |
| .readdir = ocfs2_readdir, |
| .fsync = ocfs2_sync_file, |
| .release = ocfs2_dir_release, |
| .open = ocfs2_dir_open, |
| .unlocked_ioctl = ocfs2_ioctl, |
| #ifdef CONFIG_COMPAT |
| .compat_ioctl = ocfs2_compat_ioctl, |
| #endif |
| .lock = ocfs2_lock, |
| .flock = ocfs2_flock, |
| }; |
| |
| /* |
| * POSIX-lockless variants of our file_operations. |
| * |
| * These will be used if the underlying cluster stack does not support |
| * posix file locking, if the user passes the "localflocks" mount |
| * option, or if we have a local-only fs. |
| * |
| * ocfs2_flock is in here because all stacks handle UNIX file locks, |
| * so we still want it in the case of no stack support for |
| * plocks. Internally, it will do the right thing when asked to ignore |
| * the cluster. |
| */ |
| const struct file_operations ocfs2_fops_no_plocks = { |
| .llseek = generic_file_llseek, |
| .read = do_sync_read, |
| .write = do_sync_write, |
| .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, |
| .unlocked_ioctl = ocfs2_ioctl, |
| #ifdef CONFIG_COMPAT |
| .compat_ioctl = ocfs2_compat_ioctl, |
| #endif |
| .flock = ocfs2_flock, |
| .splice_read = ocfs2_file_splice_read, |
| .splice_write = ocfs2_file_splice_write, |
| }; |
| |
| const struct file_operations ocfs2_dops_no_plocks = { |
| .llseek = generic_file_llseek, |
| .read = generic_read_dir, |
| .readdir = ocfs2_readdir, |
| .fsync = ocfs2_sync_file, |
| .release = ocfs2_dir_release, |
| .open = ocfs2_dir_open, |
| .unlocked_ioctl = ocfs2_ioctl, |
| #ifdef CONFIG_COMPAT |
| .compat_ioctl = ocfs2_compat_ioctl, |
| #endif |
| .flock = ocfs2_flock, |
| }; |