v4.19.13 snapshot.
diff --git a/fs/ocfs2/file.c b/fs/ocfs2/file.c
new file mode 100644
index 0000000..9fa35cb
--- /dev/null
+++ b/fs/ocfs2/file.c
@@ -0,0 +1,2652 @@
+/* -*- 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 <linux/backing-dev.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)oi->ip_blkno,
+ file->f_path.dentry->d_name.len,
+ file->f_path.dentry->d_name.name, mode);
+
+ if (file->f_mode & FMODE_WRITE) {
+ status = dquot_initialize(inode);
+ if (status)
+ goto leave;
+ }
+
+ 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 (oi->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);
+ }
+
+ file->f_mode |= FMODE_NOWAIT;
+
+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;
+ struct inode *inode = file->f_mapping->host;
+ struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
+ struct ocfs2_inode_info *oi = OCFS2_I(inode);
+ journal_t *journal = osb->journal->j_journal;
+ int ret;
+ tid_t commit_tid;
+ bool needs_barrier = false;
+
+ trace_ocfs2_sync_file(inode, file, file->f_path.dentry,
+ oi->ip_blkno,
+ file->f_path.dentry->d_name.len,
+ file->f_path.dentry->d_name.name,
+ (unsigned long long)datasync);
+
+ if (ocfs2_is_hard_readonly(osb) || ocfs2_is_soft_readonly(osb))
+ return -EROFS;
+
+ err = file_write_and_wait_range(file, start, end);
+ if (err)
+ return err;
+
+ commit_tid = datasync ? oi->i_datasync_tid : oi->i_sync_tid;
+ if (journal->j_flags & JBD2_BARRIER &&
+ !jbd2_trans_will_send_data_barrier(journal, commit_tid))
+ needs_barrier = true;
+ err = jbd2_complete_transaction(journal, commit_tid);
+ if (needs_barrier) {
+ ret = blkdev_issue_flush(inode->i_sb->s_bdev, GFP_KERNEL, NULL);
+ if (!err)
+ err = ret;
+ }
+
+ if (err)
+ mlog_errno(err);
+
+ return (err < 0) ? -EIO : 0;
+}
+
+int ocfs2_should_update_atime(struct inode *inode,
+ struct vfsmount *vfsmnt)
+{
+ struct timespec64 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 & SB_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 ((timespec64_compare(&inode->i_atime, &inode->i_mtime) <= 0) ||
+ (timespec64_compare(&inode->i_atime, &inode->i_ctime) <= 0))
+ return 1;
+
+ return 0;
+ }
+
+ now = current_time(inode);
+ 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(inode);
+ di->i_atime = cpu_to_le64(inode->i_atime.tv_sec);
+ di->i_atime_nsec = cpu_to_le32(inode->i_atime.tv_nsec);
+ ocfs2_update_inode_fsync_trans(handle, inode, 0);
+ ocfs2_journal_dirty(handle, bh);
+
+out_commit:
+ ocfs2_commit_trans(osb, handle);
+out:
+ return ret;
+}
+
+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(inode);
+
+ 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_update_inode_fsync_trans(handle, inode, 0);
+ 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;
+
+ /*
+ * 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(inode);
+
+ 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_update_inode_fsync_trans(handle, inode, 0);
+
+ ocfs2_journal_dirty(handle, fe_bh);
+
+out_commit:
+ ocfs2_commit_trans(osb, handle);
+out:
+ return status;
+}
+
+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;
+ }
+
+ 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 = RESTART_NONE;
+ struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
+ struct ocfs2_extent_tree et;
+ int did_quota = 0;
+
+ /*
+ * Unwritten extent only exists for file systems which
+ * 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);
+ 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_update_inode_fsync_trans(handle, inode, 1);
+ 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);
+
+ status = ocfs2_allocate_extend_trans(handle, 1);
+ 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 buffer_head *di_bh)
+{
+ 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);
+ goto out;
+ }
+
+ ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh,
+ OCFS2_JOURNAL_ACCESS_WRITE);
+ if (ret)
+ mlog_errno(ret);
+ ocfs2_update_inode_fsync_trans(handle, inode, 1);
+
+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 buffer_head *di_bh)
+{
+ struct address_space *mapping = inode->i_mapping;
+ struct page *page;
+ unsigned long index = abs_from >> PAGE_SHIFT;
+ handle_t *handle;
+ int ret = 0;
+ unsigned zero_from, zero_to, block_start, block_end;
+ struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
+
+ BUG_ON(abs_from >= abs_to);
+ BUG_ON(abs_to > (((u64)index + 1) << PAGE_SHIFT));
+ BUG_ON(abs_from & (inode->i_blkbits - 1));
+
+ handle = ocfs2_zero_start_ordered_transaction(inode, di_bh);
+ if (IS_ERR(handle)) {
+ ret = PTR_ERR(handle);
+ goto out;
+ }
+
+ page = find_or_create_page(mapping, index, GFP_NOFS);
+ if (!page) {
+ ret = -ENOMEM;
+ mlog_errno(ret);
+ goto out_commit_trans;
+ }
+
+ /* Get the offsets within the page that we want to zero */
+ zero_from = abs_from & (PAGE_SIZE - 1);
+ zero_to = abs_to & (PAGE_SIZE - 1);
+ if (!zero_to)
+ zero_to = PAGE_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 + i_blocksize(inode);
+
+ /*
+ * 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;
+ }
+
+
+ /* 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;
+ }
+
+ /*
+ * fs-writeback will release the dirty pages without page lock
+ * whose offset are over inode size, the release happens at
+ * block_write_full_page().
+ */
+ i_size_write(inode, abs_to);
+ inode->i_blocks = ocfs2_inode_sector_count(inode);
+ di->i_size = cpu_to_le64((u64)i_size_read(inode));
+ inode->i_mtime = inode->i_ctime = current_time(inode);
+ di->i_mtime = di->i_ctime = cpu_to_le64(inode->i_mtime.tv_sec);
+ di->i_ctime_nsec = cpu_to_le32(inode->i_mtime.tv_nsec);
+ di->i_mtime_nsec = di->i_ctime_nsec;
+ if (handle) {
+ ocfs2_journal_dirty(handle, di_bh);
+ ocfs2_update_inode_fsync_trans(handle, inode, 1);
+ }
+
+out_unlock:
+ unlock_page(page);
+ put_page(page);
+out_commit_trans:
+ if (handle)
+ ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
+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, 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, struct buffer_head *di_bh)
+{
+ 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_MASK) + PAGE_SIZE;
+ if (next_pos > range_end)
+ next_pos = range_end;
+ rc = ocfs2_write_zero_page(inode, zero_pos, next_pos, di_bh);
+ 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, di_bh);
+ 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 && ocfs2_is_refcount_inode(inode));
+ 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;
+ int inode_locked = 0;
+ struct inode *inode = d_inode(dentry);
+ 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;
+ int had_lock;
+ struct ocfs2_lock_holder oh;
+
+ 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,
+ from_kuid(&init_user_ns, attr->ia_uid),
+ from_kgid(&init_user_ns, 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 = setattr_prepare(dentry, attr);
+ if (status)
+ return status;
+
+ if (is_quota_modification(inode, attr)) {
+ status = dquot_initialize(inode);
+ if (status)
+ return status;
+ }
+ size_change = S_ISREG(inode->i_mode) && attr->ia_valid & ATTR_SIZE;
+ if (size_change) {
+ /*
+ * Here we should wait dio to finish before inode lock
+ * to avoid a deadlock between ocfs2_setattr() and
+ * ocfs2_dio_end_io_write()
+ */
+ inode_dio_wait(inode);
+
+ status = ocfs2_rw_lock(inode, 1);
+ if (status < 0) {
+ mlog_errno(status);
+ goto bail;
+ }
+ }
+
+ had_lock = ocfs2_inode_lock_tracker(inode, &bh, 1, &oh);
+ if (had_lock < 0) {
+ status = had_lock;
+ goto bail_unlock_rw;
+ } else if (had_lock) {
+ /*
+ * As far as we know, ocfs2_setattr() could only be the first
+ * VFS entry point in the call chain of recursive cluster
+ * locking issue.
+ *
+ * For instance:
+ * chmod_common()
+ * notify_change()
+ * ocfs2_setattr()
+ * posix_acl_chmod()
+ * ocfs2_iop_get_acl()
+ *
+ * But, we're not 100% sure if it's always true, because the
+ * ordering of the VFS entry points in the call chain is out
+ * of our control. So, we'd better dump the stack here to
+ * catch the other cases of recursive locking.
+ */
+ mlog(ML_ERROR, "Another case of recursive locking:\n");
+ dump_stack();
+ }
+ inode_locked = 1;
+
+ if (size_change) {
+ 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 && !uid_eq(attr->ia_uid, inode->i_uid)) ||
+ (attr->ia_valid & ATTR_GID && !gid_eq(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 && !uid_eq(attr->ia_uid, inode->i_uid)
+ && OCFS2_HAS_RO_COMPAT_FEATURE(sb,
+ OCFS2_FEATURE_RO_COMPAT_USRQUOTA)) {
+ transfer_to[USRQUOTA] = dqget(sb, make_kqid_uid(attr->ia_uid));
+ if (IS_ERR(transfer_to[USRQUOTA])) {
+ status = PTR_ERR(transfer_to[USRQUOTA]);
+ goto bail_unlock;
+ }
+ }
+ if (attr->ia_valid & ATTR_GID && !gid_eq(attr->ia_gid, inode->i_gid)
+ && OCFS2_HAS_RO_COMPAT_FEATURE(sb,
+ OCFS2_FEATURE_RO_COMPAT_GRPQUOTA)) {
+ transfer_to[GRPQUOTA] = dqget(sb, make_kqid_gid(attr->ia_gid));
+ if (IS_ERR(transfer_to[GRPQUOTA])) {
+ status = PTR_ERR(transfer_to[GRPQUOTA]);
+ 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;
+ }
+ }
+
+ 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:
+ if (status && inode_locked) {
+ ocfs2_inode_unlock_tracker(inode, 1, &oh, had_lock);
+ inode_locked = 0;
+ }
+bail_unlock_rw:
+ if (size_change)
+ ocfs2_rw_unlock(inode, 1);
+bail:
+
+ /* Release quota pointers in case we acquired them */
+ for (qtype = 0; qtype < OCFS2_MAXQUOTAS; qtype++)
+ dqput(transfer_to[qtype]);
+
+ if (!status && attr->ia_valid & ATTR_MODE) {
+ status = ocfs2_acl_chmod(inode, bh);
+ if (status < 0)
+ mlog_errno(status);
+ }
+ if (inode_locked)
+ ocfs2_inode_unlock_tracker(inode, 1, &oh, had_lock);
+
+ brelse(bh);
+ return status;
+}
+
+int ocfs2_getattr(const struct path *path, struct kstat *stat,
+ u32 request_mask, unsigned int flags)
+{
+ struct inode *inode = d_inode(path->dentry);
+ struct super_block *sb = path->dentry->d_sb;
+ struct ocfs2_super *osb = sb->s_fs_info;
+ int err;
+
+ err = ocfs2_inode_revalidate(path->dentry);
+ if (err) {
+ if (err != -ENOENT)
+ mlog_errno(err);
+ goto bail;
+ }
+
+ generic_fillattr(inode, stat);
+ /*
+ * If there is inline data in the inode, the inode will normally not
+ * have data blocks allocated (it may have an external xattr block).
+ * Report at least one sector for such files, so tools like tar, rsync,
+ * others don't incorrectly think the file is completely sparse.
+ */
+ if (unlikely(OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL))
+ stat->blocks += (stat->size + 511)>>9;
+
+ /* 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, had_lock;
+ struct ocfs2_lock_holder oh;
+
+ if (mask & MAY_NOT_BLOCK)
+ return -ECHILD;
+
+ had_lock = ocfs2_inode_lock_tracker(inode, NULL, 0, &oh);
+ if (had_lock < 0) {
+ ret = had_lock;
+ goto out;
+ } else if (had_lock) {
+ /* See comments in ocfs2_setattr() for details.
+ * The call chain of this case could be:
+ * do_sys_open()
+ * may_open()
+ * inode_permission()
+ * ocfs2_permission()
+ * ocfs2_iop_get_acl()
+ */
+ mlog(ML_ERROR, "Another case of recursive locking:\n");
+ dump_stack();
+ }
+
+ ret = generic_permission(inode, mask);
+
+ ocfs2_inode_unlock_tracker(inode, 0, &oh, had_lock);
+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_update_inode_fsync_trans(handle, inode, 0);
+
+ ocfs2_journal_dirty(handle, bh);
+
+out_trans:
+ ocfs2_commit_trans(osb, handle);
+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 = 0;
+ u64 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;
+ }
+
+ /*
+ * If start is on a cluster boundary and end is somewhere in another
+ * cluster, we have not COWed the cluster starting at start, unless
+ * end is also within the same cluster. So, in this case, we skip this
+ * first call to ocfs2_zero_range_for_truncate() truncate and move on
+ * to the next one.
+ */
+ if ((start & (csize - 1)) != 0) {
+ /*
+ * 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_update_inode_fsync_trans(handle, inode, 1);
+
+ 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;
+}
+
+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_is_refcount_inode(inode)) {
+ 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, false);
+ 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_free_path(path);
+ 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;
+
+ inode_lock(inode);
+
+ /*
+ * 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 ||
+ cmd == OCFS2_IOC_UNRESVSP || cmd == OCFS2_IOC_UNRESVSP64) {
+ 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(inode);
+ 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:
+ inode_unlock(inode);
+ return ret;
+}
+
+int ocfs2_change_file_space(struct file *file, unsigned int cmd,
+ struct ocfs2_space_resv *sr)
+{
+ struct inode *inode = file_inode(file);
+ struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
+ int ret;
+
+ 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;
+
+ ret = mnt_want_write_file(file);
+ if (ret)
+ return ret;
+ ret = __ocfs2_change_file_space(file, inode, file->f_pos, cmd, sr, 0);
+ mnt_drop_write_file(file);
+ return ret;
+}
+
+static long ocfs2_fallocate(struct file *file, int mode, loff_t offset,
+ loff_t len)
+{
+ struct inode *inode = file_inode(file);
+ 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_is_refcount_inode(inode) ||
+ 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_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, 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 pos, size_t count, int wait)
+{
+ int ret = 0, meta_level = 0, overwrite_io = 0;
+ struct dentry *dentry = file->f_path.dentry;
+ struct inode *inode = d_inode(dentry);
+ struct buffer_head *di_bh = NULL;
+ loff_t end;
+
+ /*
+ * We start with a read level meta lock and only jump to an ex
+ * if we need to make modifications here.
+ */
+ for(;;) {
+ if (wait)
+ ret = ocfs2_inode_lock(inode, NULL, meta_level);
+ else
+ ret = ocfs2_try_inode_lock(inode,
+ overwrite_io ? NULL : &di_bh, meta_level);
+ if (ret < 0) {
+ meta_level = -1;
+ if (ret != -EAGAIN)
+ mlog_errno(ret);
+ goto out;
+ }
+
+ /*
+ * Check if IO will overwrite allocated blocks in case
+ * IOCB_NOWAIT flag is set.
+ */
+ if (!wait && !overwrite_io) {
+ overwrite_io = 1;
+ if (!down_read_trylock(&OCFS2_I(inode)->ip_alloc_sem)) {
+ ret = -EAGAIN;
+ goto out_unlock;
+ }
+
+ ret = ocfs2_overwrite_io(inode, di_bh, pos, count);
+ brelse(di_bh);
+ di_bh = NULL;
+ up_read(&OCFS2_I(inode)->ip_alloc_sem);
+ if (ret < 0) {
+ if (ret != -EAGAIN)
+ mlog_errno(ret);
+ goto out_unlock;
+ }
+ }
+
+ /* 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;
+ }
+ }
+
+ end = pos + count;
+
+ ret = ocfs2_check_range_for_refcount(inode, pos, count);
+ if (ret == 1) {
+ ocfs2_inode_unlock(inode, meta_level);
+ meta_level = -1;
+
+ ret = ocfs2_prepare_inode_for_refcount(inode,
+ file,
+ pos,
+ count,
+ &meta_level);
+ }
+
+ if (ret < 0) {
+ mlog_errno(ret);
+ goto out_unlock;
+ }
+
+ break;
+ }
+
+out_unlock:
+ trace_ocfs2_prepare_inode_for_write(OCFS2_I(inode)->ip_blkno,
+ pos, count, wait);
+
+ brelse(di_bh);
+
+ if (meta_level >= 0)
+ ocfs2_inode_unlock(inode, meta_level);
+
+out:
+ return ret;
+}
+
+static ssize_t ocfs2_file_write_iter(struct kiocb *iocb,
+ struct iov_iter *from)
+{
+ int rw_level;
+ ssize_t written = 0;
+ ssize_t ret;
+ size_t count = iov_iter_count(from);
+ struct file *file = iocb->ki_filp;
+ struct inode *inode = file_inode(file);
+ struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
+ int full_coherency = !(osb->s_mount_opt &
+ OCFS2_MOUNT_COHERENCY_BUFFERED);
+ void *saved_ki_complete = NULL;
+ int append_write = ((iocb->ki_pos + count) >=
+ i_size_read(inode) ? 1 : 0);
+ int direct_io = iocb->ki_flags & IOCB_DIRECT ? 1 : 0;
+ int nowait = iocb->ki_flags & IOCB_NOWAIT ? 1 : 0;
+
+ trace_ocfs2_file_write_iter(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)from->nr_segs); /* GRRRRR */
+
+ if (!direct_io && nowait)
+ return -EOPNOTSUPP;
+
+ if (count == 0)
+ return 0;
+
+ if (nowait) {
+ if (!inode_trylock(inode))
+ return -EAGAIN;
+ } else
+ inode_lock(inode);
+
+ /*
+ * Concurrent O_DIRECT writes are allowed with
+ * mount_option "coherency=buffered".
+ * For append write, we must take rw EX.
+ */
+ rw_level = (!direct_io || full_coherency || append_write);
+
+ if (nowait)
+ ret = ocfs2_try_rw_lock(inode, rw_level);
+ else
+ ret = ocfs2_rw_lock(inode, rw_level);
+ if (ret < 0) {
+ if (ret != -EAGAIN)
+ mlog_errno(ret);
+ goto out_mutex;
+ }
+
+ /*
+ * 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().
+ */
+ if (nowait)
+ ret = ocfs2_try_inode_lock(inode, NULL, 1);
+ else
+ ret = ocfs2_inode_lock(inode, NULL, 1);
+ if (ret < 0) {
+ if (ret != -EAGAIN)
+ mlog_errno(ret);
+ goto out;
+ }
+
+ ocfs2_inode_unlock(inode, 1);
+ }
+
+ ret = generic_write_checks(iocb, from);
+ if (ret <= 0) {
+ if (ret)
+ mlog_errno(ret);
+ goto out;
+ }
+ count = ret;
+
+ ret = ocfs2_prepare_inode_for_write(file, iocb->ki_pos, count, !nowait);
+ if (ret < 0) {
+ if (ret != -EAGAIN)
+ mlog_errno(ret);
+ goto out;
+ }
+
+ if (direct_io && !is_sync_kiocb(iocb) &&
+ ocfs2_is_io_unaligned(inode, count, iocb->ki_pos)) {
+ /*
+ * Make it a sync io if it's an unaligned aio.
+ */
+ saved_ki_complete = xchg(&iocb->ki_complete, NULL);
+ }
+
+ /* communicate with ocfs2_dio_end_io */
+ ocfs2_iocb_set_rw_locked(iocb, rw_level);
+
+ written = __generic_file_write_iter(iocb, from);
+ /* buffered aio wouldn't have proper lock coverage today */
+ BUG_ON(written == -EIOCBQUEUED && !(iocb->ki_flags & IOCB_DIRECT));
+
+ /*
+ * deep in g_f_a_w_n()->ocfs2_direct_IO we pass in a ocfs2_dio_end_io
+ * function pointer which is called when o_direct io completes so that
+ * it can unlock our rw lock.
+ * 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 ((written == -EIOCBQUEUED) || (!ocfs2_iocb_is_rw_locked(iocb))) {
+ rw_level = -1;
+ }
+
+ if (unlikely(written <= 0))
+ goto out;
+
+ if (((file->f_flags & O_DSYNC) && !direct_io) ||
+ IS_SYNC(inode)) {
+ ret = filemap_fdatawrite_range(file->f_mapping,
+ iocb->ki_pos - written,
+ iocb->ki_pos - 1);
+ if (ret < 0)
+ written = ret;
+
+ if (!ret) {
+ ret = jbd2_journal_force_commit(osb->journal->j_journal);
+ if (ret < 0)
+ written = ret;
+ }
+
+ if (!ret)
+ ret = filemap_fdatawait_range(file->f_mapping,
+ iocb->ki_pos - written,
+ iocb->ki_pos - 1);
+ }
+
+out:
+ if (saved_ki_complete)
+ xchg(&iocb->ki_complete, saved_ki_complete);
+
+ if (rw_level != -1)
+ ocfs2_rw_unlock(inode, rw_level);
+
+out_mutex:
+ inode_unlock(inode);
+
+ if (written)
+ ret = written;
+ return ret;
+}
+
+static ssize_t ocfs2_file_read_iter(struct kiocb *iocb,
+ struct iov_iter *to)
+{
+ int ret = 0, rw_level = -1, lock_level = 0;
+ struct file *filp = iocb->ki_filp;
+ struct inode *inode = file_inode(filp);
+ int direct_io = iocb->ki_flags & IOCB_DIRECT ? 1 : 0;
+ int nowait = iocb->ki_flags & IOCB_NOWAIT ? 1 : 0;
+
+ trace_ocfs2_file_read_iter(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,
+ to->nr_segs); /* GRRRRR */
+
+
+ if (!inode) {
+ ret = -EINVAL;
+ mlog_errno(ret);
+ goto bail;
+ }
+
+ if (!direct_io && nowait)
+ return -EOPNOTSUPP;
+
+ /*
+ * buffered reads protect themselves in ->readpage(). O_DIRECT reads
+ * need locks to protect pending reads from racing with truncate.
+ */
+ if (direct_io) {
+ if (nowait)
+ ret = ocfs2_try_rw_lock(inode, 0);
+ else
+ ret = ocfs2_rw_lock(inode, 0);
+
+ if (ret < 0) {
+ if (ret != -EAGAIN)
+ 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_read_iter() a chance of actually working.
+ */
+ ret = ocfs2_inode_lock_atime(inode, filp->f_path.mnt, &lock_level,
+ !nowait);
+ if (ret < 0) {
+ if (ret != -EAGAIN)
+ mlog_errno(ret);
+ goto bail;
+ }
+ ocfs2_inode_unlock(inode, lock_level);
+
+ ret = generic_file_read_iter(iocb, to);
+ trace_generic_file_read_iter_ret(ret);
+
+ /* buffered aio wouldn't have proper lock coverage today */
+ BUG_ON(ret == -EIOCBQUEUED && !(iocb->ki_flags & IOCB_DIRECT));
+
+ /* see ocfs2_file_write_iter */
+ if (ret == -EIOCBQUEUED || !ocfs2_iocb_is_rw_locked(iocb)) {
+ rw_level = -1;
+ }
+
+bail:
+ 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 whence)
+{
+ struct inode *inode = file->f_mapping->host;
+ int ret = 0;
+
+ inode_lock(inode);
+
+ switch (whence) {
+ case SEEK_SET:
+ break;
+ case SEEK_END:
+ /* SEEK_END requires the OCFS2 inode lock for the file
+ * because it references the file's size.
+ */
+ ret = ocfs2_inode_lock(inode, NULL, 0);
+ if (ret < 0) {
+ mlog_errno(ret);
+ goto out;
+ }
+ offset += i_size_read(inode);
+ ocfs2_inode_unlock(inode, 0);
+ 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, whence);
+ if (ret)
+ goto out;
+ break;
+ default:
+ ret = -EINVAL;
+ goto out;
+ }
+
+ offset = vfs_setpos(file, offset, inode->i_sb->s_maxbytes);
+
+out:
+ inode_unlock(inode);
+ if (ret)
+ return ret;
+ return offset;
+}
+
+static int ocfs2_file_clone_range(struct file *file_in,
+ loff_t pos_in,
+ struct file *file_out,
+ loff_t pos_out,
+ u64 len)
+{
+ return ocfs2_reflink_remap_range(file_in, pos_in, file_out, pos_out,
+ len, false);
+}
+
+static int ocfs2_file_dedupe_range(struct file *file_in,
+ loff_t pos_in,
+ struct file *file_out,
+ loff_t pos_out,
+ u64 len)
+{
+ return ocfs2_reflink_remap_range(file_in, pos_in, file_out, pos_out,
+ len, true);
+}
+
+const struct inode_operations ocfs2_file_iops = {
+ .setattr = ocfs2_setattr,
+ .getattr = ocfs2_getattr,
+ .permission = ocfs2_permission,
+ .listxattr = ocfs2_listxattr,
+ .fiemap = ocfs2_fiemap,
+ .get_acl = ocfs2_iop_get_acl,
+ .set_acl = ocfs2_iop_set_acl,
+};
+
+const struct inode_operations ocfs2_special_file_iops = {
+ .setattr = ocfs2_setattr,
+ .getattr = ocfs2_getattr,
+ .permission = ocfs2_permission,
+ .get_acl = ocfs2_iop_get_acl,
+ .set_acl = ocfs2_iop_set_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,
+ .mmap = ocfs2_mmap,
+ .fsync = ocfs2_sync_file,
+ .release = ocfs2_file_release,
+ .open = ocfs2_file_open,
+ .read_iter = ocfs2_file_read_iter,
+ .write_iter = ocfs2_file_write_iter,
+ .unlocked_ioctl = ocfs2_ioctl,
+#ifdef CONFIG_COMPAT
+ .compat_ioctl = ocfs2_compat_ioctl,
+#endif
+ .lock = ocfs2_lock,
+ .flock = ocfs2_flock,
+ .splice_read = generic_file_splice_read,
+ .splice_write = iter_file_splice_write,
+ .fallocate = ocfs2_fallocate,
+ .clone_file_range = ocfs2_file_clone_range,
+ .dedupe_file_range = ocfs2_file_dedupe_range,
+};
+
+const struct file_operations ocfs2_dops = {
+ .llseek = generic_file_llseek,
+ .read = generic_read_dir,
+ .iterate = 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,
+ .mmap = ocfs2_mmap,
+ .fsync = ocfs2_sync_file,
+ .release = ocfs2_file_release,
+ .open = ocfs2_file_open,
+ .read_iter = ocfs2_file_read_iter,
+ .write_iter = ocfs2_file_write_iter,
+ .unlocked_ioctl = ocfs2_ioctl,
+#ifdef CONFIG_COMPAT
+ .compat_ioctl = ocfs2_compat_ioctl,
+#endif
+ .flock = ocfs2_flock,
+ .splice_read = generic_file_splice_read,
+ .splice_write = iter_file_splice_write,
+ .fallocate = ocfs2_fallocate,
+ .clone_file_range = ocfs2_file_clone_range,
+ .dedupe_file_range = ocfs2_file_dedupe_range,
+};
+
+const struct file_operations ocfs2_dops_no_plocks = {
+ .llseek = generic_file_llseek,
+ .read = generic_read_dir,
+ .iterate = 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,
+};