diff options
Diffstat (limited to 'ANDROID_3.4.5/fs/ocfs2/file.c')
| -rw-r--r-- | ANDROID_3.4.5/fs/ocfs2/file.c | 2791 |
1 files changed, 0 insertions, 2791 deletions
diff --git a/ANDROID_3.4.5/fs/ocfs2/file.c b/ANDROID_3.4.5/fs/ocfs2/file.c deleted file mode 100644 index 7602783d..00000000 --- a/ANDROID_3.4.5/fs/ocfs2/file.c +++ /dev/null @@ -1,2791 +0,0 @@ -/* -*- 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> -#include <linux/blkdev.h> - -#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 "ocfs2_trace.h" - -#include "buffer_head_io.h" - -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); - - trace_ocfs2_file_open(inode, file, file->f_path.dentry, - (unsigned long long)OCFS2_I(inode)->ip_blkno, - file->f_path.dentry->d_name.len, - file->f_path.dentry->d_name.name, mode); - - 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: - return status; -} - -static int ocfs2_file_release(struct inode *inode, struct file *file) -{ - struct ocfs2_inode_info *oi = OCFS2_I(inode); - - spin_lock(&oi->ip_lock); - if (!--oi->ip_open_count) - oi->ip_flags &= ~OCFS2_INODE_OPEN_DIRECT; - - trace_ocfs2_file_release(inode, file, file->f_path.dentry, - oi->ip_blkno, - file->f_path.dentry->d_name.len, - file->f_path.dentry->d_name.name, - oi->ip_open_count); - spin_unlock(&oi->ip_lock); - - ocfs2_free_file_private(inode, file); - - 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, loff_t start, loff_t end, - int datasync) -{ - int err = 0; - journal_t *journal; - struct inode *inode = file->f_mapping->host; - struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); - - trace_ocfs2_sync_file(inode, file, file->f_path.dentry, - OCFS2_I(inode)->ip_blkno, - file->f_path.dentry->d_name.len, - file->f_path.dentry->d_name.name, - (unsigned long long)datasync); - - err = filemap_write_and_wait_range(inode->i_mapping, start, end); - if (err) - return err; - - /* - * Probably don't need the i_mutex at all in here, just putting it here - * to be consistent with how fsync used to be called, someone more - * familiar with the fs could possibly remove it. - */ - mutex_lock(&inode->i_mutex); - if (datasync && !(inode->i_state & I_DIRTY_DATASYNC)) { - /* - * We still have to flush drive's caches to get data to the - * platter - */ - if (osb->s_mount_opt & OCFS2_MOUNT_BARRIER) - blkdev_issue_flush(inode->i_sb->s_bdev, GFP_KERNEL, NULL); - goto bail; - } - - journal = osb->journal->j_journal; - err = jbd2_journal_force_commit(journal); - -bail: - if (err) - mlog_errno(err); - mutex_unlock(&inode->i_mutex); - - 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; - - 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: - 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; - - 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: - 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, NULL, 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; - - /* - * 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: - 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); - - /* We trust di_bh because it comes from ocfs2_inode_lock(), which - * already validated it */ - fe = (struct ocfs2_dinode *) di_bh->b_data; - - trace_ocfs2_truncate_file((unsigned long long)OCFS2_I(inode)->ip_blkno, - (unsigned long long)le64_to_cpu(fe->i_size), - (unsigned long long)new_i_size); - - 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)) { - trace_ocfs2_truncate_file_error( - (unsigned long long)le64_to_cpu(fe->i_size), - (unsigned long long)new_i_size); - status = -EINVAL; - mlog_errno(status); - goto bail; - } - - /* 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_commit_truncate(osb, inode, di_bh); - 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); - - 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; - - /* - * 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); - - 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: - trace_ocfs2_extend_allocation( - (unsigned long long)OCFS2_I(inode)->ip_blkno, - (unsigned long long)i_size_read(inode), - le32_to_cpu(fe->i_clusters), clusters_to_add, - why, restart_func); - - 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) { - restart_func = 1; - status = 0; - } else { - BUG_ON(why != RESTART_TRANS); - - /* 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; - } - } - - trace_ocfs2_extend_allocation_end(OCFS2_I(inode)->ip_blkno, - le32_to_cpu(fe->i_clusters), - (unsigned long long)le64_to_cpu(fe->i_size), - OCFS2_I(inode)->ip_clusters, - (unsigned 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; - - return status; -} - -/* - * While a write will already be ordering the data, a truncate will not. - * Thus, we need to explicitly order the zeroed pages. - */ -static handle_t *ocfs2_zero_start_ordered_transaction(struct inode *inode) -{ - struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); - handle_t *handle = NULL; - int ret = 0; - - if (!ocfs2_should_order_data(inode)) - goto out; - - handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS); - if (IS_ERR(handle)) { - ret = -ENOMEM; - mlog_errno(ret); - goto out; - } - - ret = ocfs2_jbd2_file_inode(handle, inode); - if (ret < 0) - mlog_errno(ret); - -out: - if (ret) { - if (!IS_ERR(handle)) - ocfs2_commit_trans(osb, handle); - handle = ERR_PTR(ret); - } - return handle; -} - -/* 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 abs_from, - u64 abs_to) -{ - struct address_space *mapping = inode->i_mapping; - struct page *page; - unsigned long index = abs_from >> PAGE_CACHE_SHIFT; - handle_t *handle = NULL; - int ret = 0; - unsigned zero_from, zero_to, block_start, block_end; - - BUG_ON(abs_from >= abs_to); - BUG_ON(abs_to > (((u64)index + 1) << PAGE_CACHE_SHIFT)); - BUG_ON(abs_from & (inode->i_blkbits - 1)); - - page = find_or_create_page(mapping, index, GFP_NOFS); - if (!page) { - ret = -ENOMEM; - mlog_errno(ret); - goto out; - } - - /* Get the offsets within the page that we want to zero */ - zero_from = abs_from & (PAGE_CACHE_SIZE - 1); - zero_to = abs_to & (PAGE_CACHE_SIZE - 1); - if (!zero_to) - zero_to = PAGE_CACHE_SIZE; - - trace_ocfs2_write_zero_page( - (unsigned long long)OCFS2_I(inode)->ip_blkno, - (unsigned long long)abs_from, - (unsigned long long)abs_to, - index, zero_from, zero_to); - - /* We know that zero_from is block aligned */ - for (block_start = zero_from; block_start < zero_to; - block_start = block_end) { - block_end = block_start + (1 << inode->i_blkbits); - - /* - * block_start is block-aligned. Bump it by one to force - * __block_write_begin and block_commit_write to zero the - * whole block. - */ - ret = __block_write_begin(page, block_start + 1, 0, - ocfs2_get_block); - if (ret < 0) { - mlog_errno(ret); - goto out_unlock; - } - - if (!handle) { - handle = ocfs2_zero_start_ordered_transaction(inode); - if (IS_ERR(handle)) { - ret = PTR_ERR(handle); - handle = NULL; - break; - } - } - - /* must not update i_size! */ - ret = block_commit_write(page, block_start + 1, - block_start + 1); - 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; -} - -/* - * Find the next range to zero. We do this in terms of bytes because - * that's what ocfs2_zero_extend() wants, and it is dealing with the - * pagecache. We may return multiple extents. - * - * zero_start and zero_end are ocfs2_zero_extend()s current idea of what - * needs to be zeroed. range_start and range_end return the next zeroing - * range. A subsequent call should pass the previous range_end as its - * zero_start. If range_end is 0, there's nothing to do. - * - * Unwritten extents are skipped over. Refcounted extents are CoWd. - */ -static int ocfs2_zero_extend_get_range(struct inode *inode, - struct buffer_head *di_bh, - u64 zero_start, u64 zero_end, - u64 *range_start, u64 *range_end) -{ - int rc = 0, needs_cow = 0; - u32 p_cpos, zero_clusters = 0; - u32 zero_cpos = - zero_start >> OCFS2_SB(inode->i_sb)->s_clustersize_bits; - u32 last_cpos = ocfs2_clusters_for_bytes(inode->i_sb, zero_end); - unsigned int num_clusters = 0; - unsigned int ext_flags = 0; - - while (zero_cpos < last_cpos) { - rc = ocfs2_get_clusters(inode, zero_cpos, &p_cpos, - &num_clusters, &ext_flags); - if (rc) { - mlog_errno(rc); - goto out; - } - - if (p_cpos && !(ext_flags & OCFS2_EXT_UNWRITTEN)) { - zero_clusters = num_clusters; - if (ext_flags & OCFS2_EXT_REFCOUNTED) - needs_cow = 1; - break; - } - - zero_cpos += num_clusters; - } - if (!zero_clusters) { - *range_end = 0; - goto out; - } - - while ((zero_cpos + zero_clusters) < last_cpos) { - rc = ocfs2_get_clusters(inode, zero_cpos + zero_clusters, - &p_cpos, &num_clusters, - &ext_flags); - if (rc) { - mlog_errno(rc); - goto out; - } - - if (!p_cpos || (ext_flags & OCFS2_EXT_UNWRITTEN)) - break; - if (ext_flags & OCFS2_EXT_REFCOUNTED) - needs_cow = 1; - zero_clusters += num_clusters; - } - if ((zero_cpos + zero_clusters) > last_cpos) - zero_clusters = last_cpos - zero_cpos; - - if (needs_cow) { - rc = ocfs2_refcount_cow(inode, NULL, di_bh, zero_cpos, - zero_clusters, UINT_MAX); - if (rc) { - mlog_errno(rc); - goto out; - } - } - - *range_start = ocfs2_clusters_to_bytes(inode->i_sb, zero_cpos); - *range_end = ocfs2_clusters_to_bytes(inode->i_sb, - zero_cpos + zero_clusters); - -out: - return rc; -} - -/* - * Zero one range returned from ocfs2_zero_extend_get_range(). The caller - * has made sure that the entire range needs zeroing. - */ -static int ocfs2_zero_extend_range(struct inode *inode, u64 range_start, - u64 range_end) -{ - int rc = 0; - u64 next_pos; - u64 zero_pos = range_start; - - trace_ocfs2_zero_extend_range( - (unsigned long long)OCFS2_I(inode)->ip_blkno, - (unsigned long long)range_start, - (unsigned long long)range_end); - BUG_ON(range_start >= range_end); - - while (zero_pos < range_end) { - next_pos = (zero_pos & PAGE_CACHE_MASK) + PAGE_CACHE_SIZE; - if (next_pos > range_end) - next_pos = range_end; - rc = ocfs2_write_zero_page(inode, zero_pos, next_pos); - if (rc < 0) { - mlog_errno(rc); - break; - } - zero_pos = next_pos; - - /* - * Very large extends have the potential to lock up - * the cpu for extended periods of time. - */ - cond_resched(); - } - - return rc; -} - -int ocfs2_zero_extend(struct inode *inode, struct buffer_head *di_bh, - loff_t zero_to_size) -{ - int ret = 0; - u64 zero_start, range_start = 0, range_end = 0; - struct super_block *sb = inode->i_sb; - - zero_start = ocfs2_align_bytes_to_blocks(sb, i_size_read(inode)); - trace_ocfs2_zero_extend((unsigned long long)OCFS2_I(inode)->ip_blkno, - (unsigned long long)zero_start, - (unsigned long long)i_size_read(inode)); - while (zero_start < zero_to_size) { - ret = ocfs2_zero_extend_get_range(inode, di_bh, zero_start, - zero_to_size, - &range_start, - &range_end); - if (ret) { - mlog_errno(ret); - break; - } - if (!range_end) - break; - /* Trim the ends */ - if (range_start < zero_start) - range_start = zero_start; - if (range_end > zero_to_size) - range_end = zero_to_size; - - ret = ocfs2_zero_extend_range(inode, range_start, - range_end); - if (ret) { - mlog_errno(ret); - break; - } - zero_start = range_end; - } - - return ret; -} - -int ocfs2_extend_no_holes(struct inode *inode, struct buffer_head *di_bh, - u64 new_i_size, u64 zero_to) -{ - int ret; - u32 clusters_to_add; - struct ocfs2_inode_info *oi = OCFS2_I(inode); - - /* - * Only quota files call this without a bh, and they can't be - * refcounted. - */ - BUG_ON(!di_bh && (oi->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL)); - BUG_ON(!di_bh && !(oi->ip_flags & OCFS2_INODE_SYSTEM_FILE)); - - 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, di_bh, 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)); - - /* - * 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. We even have to hold it for sparse files because there - * might be some tail zeroing. - */ - 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_zero_extend(inode, di_bh, new_i_size); - else - ret = ocfs2_extend_no_holes(inode, di_bh, 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; - struct dquot *transfer_to[MAXQUOTAS] = { }; - int qtype; - - trace_ocfs2_setattr(inode, dentry, - (unsigned long long)OCFS2_I(inode)->ip_blkno, - dentry->d_name.len, dentry->d_name.name, - attr->ia_valid, attr->ia_mode, - attr->ia_uid, attr->ia_gid); - - /* ensuring we don't even attempt to truncate a symlink */ - if (S_ISLNK(inode->i_mode)) - attr->ia_valid &= ~ATTR_SIZE; - -#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)) - return 0; - - status = inode_change_ok(inode, attr); - if (status) - return status; - - if (is_quota_modification(inode, attr)) - dquot_initialize(inode); - 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_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; - - inode_dio_wait(inode); - - 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); - if (!transfer_to[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); - if (!transfer_to[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, transfer_to); - 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 truncate_setsize(), - * 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. - * - * XXX: this means the conditional below can probably be removed. - */ - if ((attr->ia_valid & ATTR_SIZE) && - attr->ia_size != i_size_read(inode)) { - status = vmtruncate(inode, attr->ia_size); - if (status) { - mlog_errno(status); - goto bail_commit; - } - } - - setattr_copy(inode, attr); - mark_inode_dirty(inode); - - 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]); - - if (!status && attr->ia_valid & ATTR_MODE) { - status = ocfs2_acl_chmod(inode); - if (status < 0) - mlog_errno(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; - - 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: - return err; -} - -int ocfs2_permission(struct inode *inode, int mask) -{ - int ret; - - if (mask & MAY_NOT_BLOCK) - return -ECHILD; - - ret = ocfs2_inode_lock(inode, NULL, 0); - if (ret) { - if (ret != -ENOENT) - mlog_errno(ret); - goto out; - } - - ret = generic_permission(inode, mask); - - ocfs2_inode_unlock(inode, 0); -out: - 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; - - trace_ocfs2_write_remove_suid( - (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: - 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. - */ - trace_ocfs2_zero_partial_clusters( - (unsigned long long)OCFS2_I(inode)->ip_blkno, - (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; - - trace_ocfs2_zero_partial_clusters_range1((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); - - trace_ocfs2_zero_partial_clusters_range2( - (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_find_rec(struct ocfs2_extent_list *el, u32 pos) -{ - int i; - struct ocfs2_extent_rec *rec = NULL; - - for (i = le16_to_cpu(el->l_next_free_rec) - 1; i >= 0; i--) { - - rec = &el->l_recs[i]; - - if (le32_to_cpu(rec->e_cpos) < pos) - break; - } - - return i; -} - -/* - * Helper to calculate the punching pos and length in one run, we handle the - * following three cases in order: - * - * - remove the entire record - * - remove a partial record - * - no record needs to be removed (hole-punching completed) -*/ -static void ocfs2_calc_trunc_pos(struct inode *inode, - struct ocfs2_extent_list *el, - struct ocfs2_extent_rec *rec, - u32 trunc_start, u32 *trunc_cpos, - u32 *trunc_len, u32 *trunc_end, - u64 *blkno, int *done) -{ - int ret = 0; - u32 coff, range; - - range = le32_to_cpu(rec->e_cpos) + ocfs2_rec_clusters(el, rec); - - if (le32_to_cpu(rec->e_cpos) >= trunc_start) { - /* - * remove an entire extent record. - */ - *trunc_cpos = le32_to_cpu(rec->e_cpos); - /* - * Skip holes if any. - */ - if (range < *trunc_end) - *trunc_end = range; - *trunc_len = *trunc_end - le32_to_cpu(rec->e_cpos); - *blkno = le64_to_cpu(rec->e_blkno); - *trunc_end = le32_to_cpu(rec->e_cpos); - } else if (range > trunc_start) { - /* - * remove a partial extent record, which means we're - * removing the last extent record. - */ - *trunc_cpos = trunc_start; - /* - * skip hole if any. - */ - if (range < *trunc_end) - *trunc_end = range; - *trunc_len = *trunc_end - trunc_start; - coff = trunc_start - le32_to_cpu(rec->e_cpos); - *blkno = le64_to_cpu(rec->e_blkno) + - ocfs2_clusters_to_blocks(inode->i_sb, coff); - *trunc_end = trunc_start; - } else { - /* - * It may have two following possibilities: - * - * - last record has been removed - * - trunc_start was within a hole - * - * both two cases mean the completion of hole punching. - */ - ret = 1; - } - - *done = ret; -} - -static int ocfs2_remove_inode_range(struct inode *inode, - struct buffer_head *di_bh, u64 byte_start, - u64 byte_len) -{ - int ret = 0, flags = 0, done = 0, i; - u32 trunc_start, trunc_len, trunc_end, trunc_cpos, phys_cpos; - u32 cluster_in_el; - 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; - struct ocfs2_path *path = NULL; - struct ocfs2_extent_list *el = NULL; - struct ocfs2_extent_rec *rec = NULL; - struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data; - u64 blkno, refcount_loc = le64_to_cpu(di->i_refcount_loc); - - ocfs2_init_dinode_extent_tree(&et, INODE_CACHE(inode), di_bh); - ocfs2_init_dealloc_ctxt(&dealloc); - - trace_ocfs2_remove_inode_range( - (unsigned long long)OCFS2_I(inode)->ip_blkno, - (unsigned long long)byte_start, - (unsigned long long)byte_len); - - 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; - } - - /* - * For reflinks, we may need to CoW 2 clusters which might be - * partially zero'd later, if hole's start and end offset were - * within one cluster(means is not exactly aligned to clustersize). - */ - - if (OCFS2_I(inode)->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL) { - - ret = ocfs2_cow_file_pos(inode, di_bh, byte_start); - if (ret) { - mlog_errno(ret); - goto out; - } - - ret = ocfs2_cow_file_pos(inode, di_bh, byte_start + byte_len); - if (ret) { - mlog_errno(ret); - goto out; - } - } - - trunc_start = ocfs2_clusters_for_bytes(osb->sb, byte_start); - trunc_end = (byte_start + byte_len) >> osb->s_clustersize_bits; - cluster_in_el = trunc_end; - - ret = ocfs2_zero_partial_clusters(inode, byte_start, byte_len); - if (ret) { - mlog_errno(ret); - goto out; - } - - path = ocfs2_new_path_from_et(&et); - if (!path) { - ret = -ENOMEM; - mlog_errno(ret); - goto out; - } - - while (trunc_end > trunc_start) { - - ret = ocfs2_find_path(INODE_CACHE(inode), path, - cluster_in_el); - if (ret) { - mlog_errno(ret); - goto out; - } - - el = path_leaf_el(path); - - i = ocfs2_find_rec(el, trunc_end); - /* - * Need to go to previous extent block. - */ - if (i < 0) { - if (path->p_tree_depth == 0) - break; - - ret = ocfs2_find_cpos_for_left_leaf(inode->i_sb, - path, - &cluster_in_el); - if (ret) { - mlog_errno(ret); - goto out; - } - - /* - * We've reached the leftmost extent block, - * it's safe to leave. - */ - if (cluster_in_el == 0) - break; - - /* - * The 'pos' searched for previous extent block is - * always one cluster less than actual trunc_end. - */ - trunc_end = cluster_in_el + 1; - - ocfs2_reinit_path(path, 1); - - continue; - - } else - rec = &el->l_recs[i]; - - ocfs2_calc_trunc_pos(inode, el, rec, trunc_start, &trunc_cpos, - &trunc_len, &trunc_end, &blkno, &done); - if (done) - break; - - flags = rec->e_flags; - phys_cpos = ocfs2_blocks_to_clusters(inode->i_sb, blkno); - - ret = ocfs2_remove_btree_range(inode, &et, trunc_cpos, - phys_cpos, trunc_len, flags, - &dealloc, refcount_loc); - if (ret < 0) { - mlog_errno(ret); - goto out; - } - - cluster_in_el = trunc_end; - - ocfs2_reinit_path(path, 1); - } - - 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); - - if (file && (file->f_flags & O_SYNC)) - handle->h_sync = 1; - - 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 file *file, int mode, loff_t offset, - loff_t len) -{ - struct inode *inode = file->f_path.dentry->d_inode; - struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); - struct ocfs2_space_resv sr; - int change_size = 1; - int cmd = OCFS2_IOC_RESVSP64; - - if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE)) - return -EOPNOTSUPP; - if (!ocfs2_writes_unwritten_extents(osb)) - return -EOPNOTSUPP; - - if (mode & FALLOC_FL_KEEP_SIZE) - change_size = 0; - - if (mode & FALLOC_FL_PUNCH_HOLE) - cmd = OCFS2_IOC_UNRESVSP64; - - sr.l_whence = 0; - sr.l_start = (s64)offset; - sr.l_len = (s64)len; - - return __ocfs2_change_file_space(NULL, inode, offset, cmd, &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 void ocfs2_aiodio_wait(struct inode *inode) -{ - wait_queue_head_t *wq = ocfs2_ioend_wq(inode); - - wait_event(*wq, (atomic_read(&OCFS2_I(inode)->ip_unaligned_aio) == 0)); -} - -static int ocfs2_is_io_unaligned(struct inode *inode, size_t count, loff_t pos) -{ - int blockmask = inode->i_sb->s_blocksize - 1; - loff_t final_size = pos + count; - - if ((pos & blockmask) || (final_size & blockmask)) - return 1; - return 0; -} - -static int ocfs2_prepare_inode_for_refcount(struct inode *inode, - struct file *file, - 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, file, 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 file *file, - loff_t *ppos, - size_t count, - int appending, - int *direct_io, - int *has_refcount) -{ - int ret = 0, meta_level = 0; - struct dentry *dentry = file->f_path.dentry; - struct inode *inode = dentry->d_inode; - loff_t saved_pos = 0, 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 - * proceed, 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); - 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, - file, - 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: - trace_ocfs2_prepare_inode_for_write(OCFS2_I(inode)->ip_blkno, - saved_pos, appending, count, - direct_io, has_refcount); - - 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); - int full_coherency = !(osb->s_mount_opt & - OCFS2_MOUNT_COHERENCY_BUFFERED); - int unaligned_dio = 0; - - trace_ocfs2_file_aio_write(inode, file, file->f_path.dentry, - (unsigned long long)OCFS2_I(inode)->ip_blkno, - file->f_path.dentry->d_name.len, - file->f_path.dentry->d_name.name, - (unsigned int)nr_segs); - - 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); - - ocfs2_iocb_clear_sem_locked(iocb); - -relock: - /* to match setattr's i_mutex -> rw_lock ordering */ - if (direct_io) { - have_alloc_sem = 1; - /* communicate with ocfs2_dio_end_io */ - ocfs2_iocb_set_sem_locked(iocb); - } - - /* - * Concurrent O_DIRECT writes are allowed with - * mount_option "coherency=buffered". - */ - rw_level = (!direct_io || full_coherency); - - ret = ocfs2_rw_lock(inode, rw_level); - if (ret < 0) { - mlog_errno(ret); - goto out_sems; - } - - /* - * O_DIRECT writes with "coherency=full" need to take EX cluster - * inode_lock to guarantee coherency. - */ - if (direct_io && full_coherency) { - /* - * We need to take and drop the inode lock to force - * other nodes to drop their caches. Buffered I/O - * already does this in write_begin(). - */ - ret = ocfs2_inode_lock(inode, NULL, 1); - if (ret < 0) { - mlog_errno(ret); - goto out_sems; - } - - ocfs2_inode_unlock(inode, 1); - } - - can_do_direct = direct_io; - ret = ocfs2_prepare_inode_for_write(file, ppos, - iocb->ki_left, appending, - &can_do_direct, &has_refcount); - if (ret < 0) { - mlog_errno(ret); - goto out; - } - - if (direct_io && !is_sync_kiocb(iocb)) - unaligned_dio = ocfs2_is_io_unaligned(inode, iocb->ki_left, - *ppos); - - /* - * 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); - - have_alloc_sem = 0; - rw_level = -1; - - direct_io = 0; - goto relock; - } - - if (unaligned_dio) { - /* - * Wait on previous unaligned aio to complete before - * proceeding. - */ - ocfs2_aiodio_wait(inode); - - /* Mark the iocb as needing a decrement in ocfs2_dio_end_io */ - atomic_inc(&OCFS2_I(inode)->ip_unaligned_aio); - ocfs2_iocb_set_unaligned_aio(iocb); - } - - /* - * 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); - - 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; - - if (direct_io) { - written = generic_file_direct_write(iocb, iov, &nr_segs, *ppos, - ppos, count, ocount); - if (written < 0) { - ret = written; - goto out_dio; - } - } else { - current->backing_dev_info = file->f_mapping->backing_dev_info; - written = generic_file_buffered_write(iocb, iov, nr_segs, *ppos, - ppos, count, 0); - current->backing_dev_info = NULL; - } - -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) && !direct_io)) { - 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. - * 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; - unaligned_dio = 0; - } - - if (unaligned_dio) { - ocfs2_iocb_clear_unaligned_aio(iocb); - atomic_dec(&OCFS2_I(inode)->ip_unaligned_aio); - } - -out: - if (rw_level != -1) - ocfs2_rw_unlock(inode, rw_level); - -out_sems: - if (have_alloc_sem) - ocfs2_iocb_clear_sem_locked(iocb); - - mutex_unlock(&inode->i_mutex); - - if (written) - ret = written; - 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, &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, - }; - - - trace_ocfs2_file_splice_write(inode, out, out->f_path.dentry, - (unsigned long long)OCFS2_I(inode)->ip_blkno, - out->f_path.dentry->d_name.len, - out->f_path.dentry->d_name.name, len); - - 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); - } - - 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; - - trace_ocfs2_file_splice_read(inode, in, in->f_path.dentry, - (unsigned long long)OCFS2_I(inode)->ip_blkno, - in->f_path.dentry->d_name.len, - in->f_path.dentry->d_name.name, len); - - /* - * 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: - 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; - - trace_ocfs2_file_aio_read(inode, filp, filp->f_path.dentry, - (unsigned long long)OCFS2_I(inode)->ip_blkno, - filp->f_path.dentry->d_name.len, - filp->f_path.dentry->d_name.name, nr_segs); - - - if (!inode) { - ret = -EINVAL; - mlog_errno(ret); - goto bail; - } - - ocfs2_iocb_clear_sem_locked(iocb); - - /* - * 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) { - have_alloc_sem = 1; - ocfs2_iocb_set_sem_locked(iocb); - - 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); - trace_generic_file_aio_read_ret(ret); - - /* 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) - ocfs2_iocb_clear_sem_locked(iocb); - - if (rw_level != -1) - ocfs2_rw_unlock(inode, rw_level); - - return ret; -} - -/* Refer generic_file_llseek_unlocked() */ -static loff_t ocfs2_file_llseek(struct file *file, loff_t offset, int origin) -{ - struct inode *inode = file->f_mapping->host; - int ret = 0; - - mutex_lock(&inode->i_mutex); - - switch (origin) { - case SEEK_SET: - break; - case SEEK_END: - offset += inode->i_size; - break; - case SEEK_CUR: - if (offset == 0) { - offset = file->f_pos; - goto out; - } - offset += file->f_pos; - break; - case SEEK_DATA: - case SEEK_HOLE: - ret = ocfs2_seek_data_hole_offset(file, &offset, origin); - if (ret) - goto out; - break; - default: - ret = -EINVAL; - goto out; - } - - if (offset < 0 && !(file->f_mode & FMODE_UNSIGNED_OFFSET)) - ret = -EINVAL; - if (!ret && offset > inode->i_sb->s_maxbytes) - ret = -EINVAL; - if (ret) - goto out; - - if (offset != file->f_pos) { - file->f_pos = offset; - file->f_version = 0; - } - -out: - mutex_unlock(&inode->i_mutex); - if (ret) - return ret; - return offset; -} - -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, - .fiemap = ocfs2_fiemap, - .get_acl = ocfs2_iop_get_acl, -}; - -const struct inode_operations ocfs2_special_file_iops = { - .setattr = ocfs2_setattr, - .getattr = ocfs2_getattr, - .permission = ocfs2_permission, - .get_acl = ocfs2_iop_get_acl, -}; - -/* - * 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 = ocfs2_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, - .fallocate = ocfs2_fallocate, -}; - -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 = ocfs2_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, - .fallocate = ocfs2_fallocate, -}; - -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, -}; |