--- /dev/null
+/* -*- mode: c; c-basic-offset: 8; -*-
+ * vim: noexpandtab sw=8 ts=8 sts=0:
+ *
+ * alloc.c
+ *
+ * Extent allocs and frees
+ *
+ * Copyright (C) 2002, 2004 Oracle. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public
+ * License along with this program; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 021110-1307, USA.
+ */
+
+#include <linux/fs.h>
+#include <linux/types.h>
+#include <linux/slab.h>
+#include <linux/highmem.h>
+
+#define MLOG_MASK_PREFIX ML_DISK_ALLOC
+#include <cluster/masklog.h>
+
+#include "ocfs2.h"
+
+#include "alloc.h"
+#include "dlmglue.h"
+#include "extent_map.h"
+#include "inode.h"
+#include "journal.h"
+#include "localalloc.h"
+#include "suballoc.h"
+#include "sysfile.h"
+#include "file.h"
+#include "super.h"
+#include "uptodate.h"
+
+#include "buffer_head_io.h"
+
+static int ocfs2_extent_contig(struct inode *inode,
+ struct ocfs2_extent_rec *ext,
+ u64 blkno);
+
+static int ocfs2_create_new_meta_bhs(struct ocfs2_super *osb,
+ struct ocfs2_journal_handle *handle,
+ struct inode *inode,
+ int wanted,
+ struct ocfs2_alloc_context *meta_ac,
+ struct buffer_head *bhs[]);
+
+static int ocfs2_add_branch(struct ocfs2_super *osb,
+ struct ocfs2_journal_handle *handle,
+ struct inode *inode,
+ struct buffer_head *fe_bh,
+ struct buffer_head *eb_bh,
+ struct buffer_head *last_eb_bh,
+ struct ocfs2_alloc_context *meta_ac);
+
+static int ocfs2_shift_tree_depth(struct ocfs2_super *osb,
+ struct ocfs2_journal_handle *handle,
+ struct inode *inode,
+ struct buffer_head *fe_bh,
+ struct ocfs2_alloc_context *meta_ac,
+ struct buffer_head **ret_new_eb_bh);
+
+static int ocfs2_do_insert_extent(struct ocfs2_super *osb,
+ struct ocfs2_journal_handle *handle,
+ struct inode *inode,
+ struct buffer_head *fe_bh,
+ u64 blkno,
+ u32 new_clusters);
+
+static int ocfs2_find_branch_target(struct ocfs2_super *osb,
+ struct inode *inode,
+ struct buffer_head *fe_bh,
+ struct buffer_head **target_bh);
+
+static int ocfs2_find_new_last_ext_blk(struct ocfs2_super *osb,
+ struct inode *inode,
+ struct ocfs2_dinode *fe,
+ unsigned int new_i_clusters,
+ struct buffer_head *old_last_eb,
+ struct buffer_head **new_last_eb);
+
+static void ocfs2_free_truncate_context(struct ocfs2_truncate_context *tc);
+
+static int ocfs2_extent_contig(struct inode *inode,
+ struct ocfs2_extent_rec *ext,
+ u64 blkno)
+{
+ return blkno == (le64_to_cpu(ext->e_blkno) +
+ ocfs2_clusters_to_blocks(inode->i_sb,
+ le32_to_cpu(ext->e_clusters)));
+}
+
+/*
+ * How many free extents have we got before we need more meta data?
+ */
+int ocfs2_num_free_extents(struct ocfs2_super *osb,
+ struct inode *inode,
+ struct ocfs2_dinode *fe)
+{
+ int retval;
+ struct ocfs2_extent_list *el;
+ struct ocfs2_extent_block *eb;
+ struct buffer_head *eb_bh = NULL;
+
+ mlog_entry_void();
+
+ if (!OCFS2_IS_VALID_DINODE(fe)) {
+ OCFS2_RO_ON_INVALID_DINODE(inode->i_sb, fe);
+ retval = -EIO;
+ goto bail;
+ }
+
+ if (fe->i_last_eb_blk) {
+ retval = ocfs2_read_block(osb, le64_to_cpu(fe->i_last_eb_blk),
+ &eb_bh, OCFS2_BH_CACHED, inode);
+ if (retval < 0) {
+ mlog_errno(retval);
+ goto bail;
+ }
+ eb = (struct ocfs2_extent_block *) eb_bh->b_data;
+ el = &eb->h_list;
+ } else
+ el = &fe->id2.i_list;
+
+ BUG_ON(el->l_tree_depth != 0);
+
+ retval = le16_to_cpu(el->l_count) - le16_to_cpu(el->l_next_free_rec);
+bail:
+ if (eb_bh)
+ brelse(eb_bh);
+
+ mlog_exit(retval);
+ return retval;
+}
+
+/* expects array to already be allocated
+ *
+ * sets h_signature, h_blkno, h_suballoc_bit, h_suballoc_slot, and
+ * l_count for you
+ */
+static int ocfs2_create_new_meta_bhs(struct ocfs2_super *osb,
+ struct ocfs2_journal_handle *handle,
+ struct inode *inode,
+ int wanted,
+ struct ocfs2_alloc_context *meta_ac,
+ struct buffer_head *bhs[])
+{
+ int count, status, i;
+ u16 suballoc_bit_start;
+ u32 num_got;
+ u64 first_blkno;
+ struct ocfs2_extent_block *eb;
+
+ mlog_entry_void();
+
+ count = 0;
+ while (count < wanted) {
+ status = ocfs2_claim_metadata(osb,
+ handle,
+ meta_ac,
+ wanted - count,
+ &suballoc_bit_start,
+ &num_got,
+ &first_blkno);
+ if (status < 0) {
+ mlog_errno(status);
+ goto bail;
+ }
+
+ for(i = count; i < (num_got + count); i++) {
+ bhs[i] = sb_getblk(osb->sb, first_blkno);
+ if (bhs[i] == NULL) {
+ status = -EIO;
+ mlog_errno(status);
+ goto bail;
+ }
+ ocfs2_set_new_buffer_uptodate(inode, bhs[i]);
+
+ status = ocfs2_journal_access(handle, inode, bhs[i],
+ OCFS2_JOURNAL_ACCESS_CREATE);
+ if (status < 0) {
+ mlog_errno(status);
+ goto bail;
+ }
+
+ memset(bhs[i]->b_data, 0, osb->sb->s_blocksize);
+ eb = (struct ocfs2_extent_block *) bhs[i]->b_data;
+ /* Ok, setup the minimal stuff here. */
+ strcpy(eb->h_signature, OCFS2_EXTENT_BLOCK_SIGNATURE);
+ eb->h_blkno = cpu_to_le64(first_blkno);
+ eb->h_fs_generation = cpu_to_le32(osb->fs_generation);
+
+#ifndef OCFS2_USE_ALL_METADATA_SUBALLOCATORS
+ /* we always use slot zero's suballocator */
+ eb->h_suballoc_slot = 0;
+#else
+ eb->h_suballoc_slot = cpu_to_le16(osb->slot_num);
+#endif
+ eb->h_suballoc_bit = cpu_to_le16(suballoc_bit_start);
+ eb->h_list.l_count =
+ cpu_to_le16(ocfs2_extent_recs_per_eb(osb->sb));
+
+ suballoc_bit_start++;
+ first_blkno++;
+
+ /* We'll also be dirtied by the caller, so
+ * this isn't absolutely necessary. */
+ status = ocfs2_journal_dirty(handle, bhs[i]);
+ if (status < 0) {
+ mlog_errno(status);
+ goto bail;
+ }
+ }
+
+ count += num_got;
+ }
+
+ status = 0;
+bail:
+ if (status < 0) {
+ for(i = 0; i < wanted; i++) {
+ if (bhs[i])
+ brelse(bhs[i]);
+ bhs[i] = NULL;
+ }
+ }
+ mlog_exit(status);
+ return status;
+}
+
+/*
+ * Add an entire tree branch to our inode. eb_bh is the extent block
+ * to start at, if we don't want to start the branch at the dinode
+ * structure.
+ *
+ * last_eb_bh is required as we have to update it's next_leaf pointer
+ * for the new last extent block.
+ *
+ * the new branch will be 'empty' in the sense that every block will
+ * contain a single record with e_clusters == 0.
+ */
+static int ocfs2_add_branch(struct ocfs2_super *osb,
+ struct ocfs2_journal_handle *handle,
+ struct inode *inode,
+ struct buffer_head *fe_bh,
+ struct buffer_head *eb_bh,
+ struct buffer_head *last_eb_bh,
+ struct ocfs2_alloc_context *meta_ac)
+{
+ int status, new_blocks, i;
+ u64 next_blkno, new_last_eb_blk;
+ struct buffer_head *bh;
+ struct buffer_head **new_eb_bhs = NULL;
+ struct ocfs2_dinode *fe;
+ struct ocfs2_extent_block *eb;
+ struct ocfs2_extent_list *eb_el;
+ struct ocfs2_extent_list *el;
+
+ mlog_entry_void();
+
+ BUG_ON(!last_eb_bh);
+
+ fe = (struct ocfs2_dinode *) fe_bh->b_data;
+
+ if (eb_bh) {
+ eb = (struct ocfs2_extent_block *) eb_bh->b_data;
+ el = &eb->h_list;
+ } else
+ el = &fe->id2.i_list;
+
+ /* we never add a branch to a leaf. */
+ BUG_ON(!el->l_tree_depth);
+
+ new_blocks = le16_to_cpu(el->l_tree_depth);
+
+ /* allocate the number of new eb blocks we need */
+ new_eb_bhs = kcalloc(new_blocks, sizeof(struct buffer_head *),
+ GFP_KERNEL);
+ if (!new_eb_bhs) {
+ status = -ENOMEM;
+ mlog_errno(status);
+ goto bail;
+ }
+
+ status = ocfs2_create_new_meta_bhs(osb, handle, inode, new_blocks,
+ meta_ac, new_eb_bhs);
+ if (status < 0) {
+ mlog_errno(status);
+ goto bail;
+ }
+
+ /* Note: new_eb_bhs[new_blocks - 1] is the guy which will be
+ * linked with the rest of the tree.
+ * conversly, new_eb_bhs[0] is the new bottommost leaf.
+ *
+ * when we leave the loop, new_last_eb_blk will point to the
+ * newest leaf, and next_blkno will point to the topmost extent
+ * block. */
+ next_blkno = new_last_eb_blk = 0;
+ for(i = 0; i < new_blocks; i++) {
+ bh = new_eb_bhs[i];
+ eb = (struct ocfs2_extent_block *) bh->b_data;
+ if (!OCFS2_IS_VALID_EXTENT_BLOCK(eb)) {
+ OCFS2_RO_ON_INVALID_EXTENT_BLOCK(inode->i_sb, eb);
+ status = -EIO;
+ goto bail;
+ }
+ eb_el = &eb->h_list;
+
+ status = ocfs2_journal_access(handle, inode, bh,
+ OCFS2_JOURNAL_ACCESS_CREATE);
+ if (status < 0) {
+ mlog_errno(status);
+ goto bail;
+ }
+
+ eb->h_next_leaf_blk = 0;
+ eb_el->l_tree_depth = cpu_to_le16(i);
+ eb_el->l_next_free_rec = cpu_to_le16(1);
+ eb_el->l_recs[0].e_cpos = fe->i_clusters;
+ eb_el->l_recs[0].e_blkno = cpu_to_le64(next_blkno);
+ eb_el->l_recs[0].e_clusters = cpu_to_le32(0);
+ if (!eb_el->l_tree_depth)
+ new_last_eb_blk = le64_to_cpu(eb->h_blkno);
+
+ status = ocfs2_journal_dirty(handle, bh);
+ if (status < 0) {
+ mlog_errno(status);
+ goto bail;
+ }
+
+ next_blkno = le64_to_cpu(eb->h_blkno);
+ }
+
+ /* This is a bit hairy. We want to update up to three blocks
+ * here without leaving any of them in an inconsistent state
+ * in case of error. We don't have to worry about
+ * journal_dirty erroring as it won't unless we've aborted the
+ * handle (in which case we would never be here) so reserving
+ * the write with journal_access is all we need to do. */
+ status = ocfs2_journal_access(handle, inode, last_eb_bh,
+ OCFS2_JOURNAL_ACCESS_WRITE);
+ if (status < 0) {
+ mlog_errno(status);
+ goto bail;
+ }
+ status = ocfs2_journal_access(handle, inode, fe_bh,
+ OCFS2_JOURNAL_ACCESS_WRITE);
+ if (status < 0) {
+ mlog_errno(status);
+ goto bail;
+ }
+ if (eb_bh) {
+ status = ocfs2_journal_access(handle, inode, eb_bh,
+ OCFS2_JOURNAL_ACCESS_WRITE);
+ if (status < 0) {
+ mlog_errno(status);
+ goto bail;
+ }
+ }
+
+ /* Link the new branch into the rest of the tree (el will
+ * either be on the fe, or the extent block passed in. */
+ i = le16_to_cpu(el->l_next_free_rec);
+ el->l_recs[i].e_blkno = cpu_to_le64(next_blkno);
+ el->l_recs[i].e_cpos = fe->i_clusters;
+ el->l_recs[i].e_clusters = 0;
+ le16_add_cpu(&el->l_next_free_rec, 1);
+
+ /* fe needs a new last extent block pointer, as does the
+ * next_leaf on the previously last-extent-block. */
+ fe->i_last_eb_blk = cpu_to_le64(new_last_eb_blk);
+
+ eb = (struct ocfs2_extent_block *) last_eb_bh->b_data;
+ eb->h_next_leaf_blk = cpu_to_le64(new_last_eb_blk);
+
+ status = ocfs2_journal_dirty(handle, last_eb_bh);
+ if (status < 0)
+ mlog_errno(status);
+ status = ocfs2_journal_dirty(handle, fe_bh);
+ if (status < 0)
+ mlog_errno(status);
+ if (eb_bh) {
+ status = ocfs2_journal_dirty(handle, eb_bh);
+ if (status < 0)
+ mlog_errno(status);
+ }
+
+ status = 0;
+bail:
+ if (new_eb_bhs) {
+ for (i = 0; i < new_blocks; i++)
+ if (new_eb_bhs[i])
+ brelse(new_eb_bhs[i]);
+ kfree(new_eb_bhs);
+ }
+
+ mlog_exit(status);
+ return status;
+}
+
+/*
+ * adds another level to the allocation tree.
+ * returns back the new extent block so you can add a branch to it
+ * after this call.
+ */
+static int ocfs2_shift_tree_depth(struct ocfs2_super *osb,
+ struct ocfs2_journal_handle *handle,
+ struct inode *inode,
+ struct buffer_head *fe_bh,
+ struct ocfs2_alloc_context *meta_ac,
+ struct buffer_head **ret_new_eb_bh)
+{
+ int status, i;
+ struct buffer_head *new_eb_bh = NULL;
+ struct ocfs2_dinode *fe;
+ struct ocfs2_extent_block *eb;
+ struct ocfs2_extent_list *fe_el;
+ struct ocfs2_extent_list *eb_el;
+
+ mlog_entry_void();
+
+ status = ocfs2_create_new_meta_bhs(osb, handle, inode, 1, meta_ac,
+ &new_eb_bh);
+ if (status < 0) {
+ mlog_errno(status);
+ goto bail;
+ }
+
+ eb = (struct ocfs2_extent_block *) new_eb_bh->b_data;
+ if (!OCFS2_IS_VALID_EXTENT_BLOCK(eb)) {
+ OCFS2_RO_ON_INVALID_EXTENT_BLOCK(inode->i_sb, eb);
+ status = -EIO;
+ goto bail;
+ }
+
+ eb_el = &eb->h_list;
+ fe = (struct ocfs2_dinode *) fe_bh->b_data;
+ fe_el = &fe->id2.i_list;
+
+ status = ocfs2_journal_access(handle, inode, new_eb_bh,
+ OCFS2_JOURNAL_ACCESS_CREATE);
+ if (status < 0) {
+ mlog_errno(status);
+ goto bail;
+ }
+
+ /* copy the fe data into the new extent block */
+ eb_el->l_tree_depth = fe_el->l_tree_depth;
+ eb_el->l_next_free_rec = fe_el->l_next_free_rec;
+ for(i = 0; i < le16_to_cpu(fe_el->l_next_free_rec); i++) {
+ eb_el->l_recs[i].e_cpos = fe_el->l_recs[i].e_cpos;
+ eb_el->l_recs[i].e_clusters = fe_el->l_recs[i].e_clusters;
+ eb_el->l_recs[i].e_blkno = fe_el->l_recs[i].e_blkno;
+ }
+
+ status = ocfs2_journal_dirty(handle, new_eb_bh);
+ if (status < 0) {
+ mlog_errno(status);
+ goto bail;
+ }
+
+ status = ocfs2_journal_access(handle, inode, fe_bh,
+ OCFS2_JOURNAL_ACCESS_WRITE);
+ if (status < 0) {
+ mlog_errno(status);
+ goto bail;
+ }
+
+ /* update fe now */
+ le16_add_cpu(&fe_el->l_tree_depth, 1);
+ fe_el->l_recs[0].e_cpos = 0;
+ fe_el->l_recs[0].e_blkno = eb->h_blkno;
+ fe_el->l_recs[0].e_clusters = fe->i_clusters;
+ for(i = 1; i < le16_to_cpu(fe_el->l_next_free_rec); i++) {
+ fe_el->l_recs[i].e_cpos = 0;
+ fe_el->l_recs[i].e_clusters = 0;
+ fe_el->l_recs[i].e_blkno = 0;
+ }
+ fe_el->l_next_free_rec = cpu_to_le16(1);
+
+ /* If this is our 1st tree depth shift, then last_eb_blk
+ * becomes the allocated extent block */
+ if (fe_el->l_tree_depth == cpu_to_le16(1))
+ fe->i_last_eb_blk = eb->h_blkno;
+
+ status = ocfs2_journal_dirty(handle, fe_bh);
+ if (status < 0) {
+ mlog_errno(status);
+ goto bail;
+ }
+
+ *ret_new_eb_bh = new_eb_bh;
+ new_eb_bh = NULL;
+ status = 0;
+bail:
+ if (new_eb_bh)
+ brelse(new_eb_bh);
+
+ mlog_exit(status);
+ return status;
+}
+
+/*
+ * Expects the tree to already have room in the rightmost leaf for the
+ * extent. Updates all the extent blocks (and the dinode) on the way
+ * down.
+ */
+static int ocfs2_do_insert_extent(struct ocfs2_super *osb,
+ struct ocfs2_journal_handle *handle,
+ struct inode *inode,
+ struct buffer_head *fe_bh,
+ u64 start_blk,
+ u32 new_clusters)
+{
+ int status, i, num_bhs = 0;
+ u64 next_blkno;
+ u16 next_free;
+ struct buffer_head **eb_bhs = NULL;
+ struct ocfs2_dinode *fe;
+ struct ocfs2_extent_block *eb;
+ struct ocfs2_extent_list *el;
+
+ mlog_entry_void();
+
+ status = ocfs2_journal_access(handle, inode, fe_bh,
+ OCFS2_JOURNAL_ACCESS_WRITE);
+ if (status < 0) {
+ mlog_errno(status);
+ goto bail;
+ }
+
+ fe = (struct ocfs2_dinode *) fe_bh->b_data;
+ el = &fe->id2.i_list;
+ if (el->l_tree_depth) {
+ /* This is another operation where we want to be
+ * careful about our tree updates. An error here means
+ * none of the previous changes we made should roll
+ * forward. As a result, we have to record the buffers
+ * for this part of the tree in an array and reserve a
+ * journal write to them before making any changes. */
+ num_bhs = le16_to_cpu(fe->id2.i_list.l_tree_depth);
+ eb_bhs = kcalloc(num_bhs, sizeof(struct buffer_head *),
+ GFP_KERNEL);
+ if (!eb_bhs) {
+ status = -ENOMEM;
+ mlog_errno(status);
+ goto bail;
+ }
+
+ i = 0;
+ while(el->l_tree_depth) {
+ next_free = le16_to_cpu(el->l_next_free_rec);
+ if (next_free == 0) {
+ ocfs2_error(inode->i_sb,
+ "Dinode %llu has a bad extent list",
+ (unsigned long long)OCFS2_I(inode)->ip_blkno);
+ status = -EIO;
+ goto bail;
+ }
+ next_blkno = le64_to_cpu(el->l_recs[next_free - 1].e_blkno);
+
+ BUG_ON(i >= num_bhs);
+ status = ocfs2_read_block(osb, next_blkno, &eb_bhs[i],
+ OCFS2_BH_CACHED, inode);
+ if (status < 0) {
+ mlog_errno(status);
+ goto bail;
+ }
+ eb = (struct ocfs2_extent_block *) eb_bhs[i]->b_data;
+ if (!OCFS2_IS_VALID_EXTENT_BLOCK(eb)) {
+ OCFS2_RO_ON_INVALID_EXTENT_BLOCK(inode->i_sb,
+ eb);
+ status = -EIO;
+ goto bail;
+ }
+
+ status = ocfs2_journal_access(handle, inode, eb_bhs[i],
+ OCFS2_JOURNAL_ACCESS_WRITE);
+ if (status < 0) {
+ mlog_errno(status);
+ goto bail;
+ }
+
+ el = &eb->h_list;
+ i++;
+ /* When we leave this loop, eb_bhs[num_bhs - 1] will
+ * hold the bottom-most leaf extent block. */
+ }
+ BUG_ON(el->l_tree_depth);
+
+ el = &fe->id2.i_list;
+ /* If we have tree depth, then the fe update is
+ * trivial, and we want to switch el out for the
+ * bottom-most leaf in order to update it with the
+ * actual extent data below. */
+ next_free = le16_to_cpu(el->l_next_free_rec);
+ if (next_free == 0) {
+ ocfs2_error(inode->i_sb,
+ "Dinode %llu has a bad extent list",
+ (unsigned long long)OCFS2_I(inode)->ip_blkno);
+ status = -EIO;
+ goto bail;
+ }
+ le32_add_cpu(&el->l_recs[next_free - 1].e_clusters,
+ new_clusters);
+ /* (num_bhs - 1) to avoid the leaf */
+ for(i = 0; i < (num_bhs - 1); i++) {
+ eb = (struct ocfs2_extent_block *) eb_bhs[i]->b_data;
+ el = &eb->h_list;
+
+ /* finally, make our actual change to the
+ * intermediate extent blocks. */
+ next_free = le16_to_cpu(el->l_next_free_rec);
+ le32_add_cpu(&el->l_recs[next_free - 1].e_clusters,
+ new_clusters);
+
+ status = ocfs2_journal_dirty(handle, eb_bhs[i]);
+ if (status < 0)
+ mlog_errno(status);
+ }
+ BUG_ON(i != (num_bhs - 1));
+ /* note that the leaf block wasn't touched in
+ * the loop above */
+ eb = (struct ocfs2_extent_block *) eb_bhs[num_bhs - 1]->b_data;
+ el = &eb->h_list;
+ BUG_ON(el->l_tree_depth);
+ }
+
+ /* yay, we can finally add the actual extent now! */
+ i = le16_to_cpu(el->l_next_free_rec) - 1;
+ if (le16_to_cpu(el->l_next_free_rec) &&
+ ocfs2_extent_contig(inode, &el->l_recs[i], start_blk)) {
+ le32_add_cpu(&el->l_recs[i].e_clusters, new_clusters);
+ } else if (le16_to_cpu(el->l_next_free_rec) &&
+ (le32_to_cpu(el->l_recs[i].e_clusters) == 0)) {
+ /* having an empty extent at eof is legal. */
+ if (el->l_recs[i].e_cpos != fe->i_clusters) {
+ ocfs2_error(inode->i_sb,
+ "Dinode %llu trailing extent is bad: "
+ "cpos (%u) != number of clusters (%u)",
+ (unsigned long long)OCFS2_I(inode)->ip_blkno,
+ le32_to_cpu(el->l_recs[i].e_cpos),
+ le32_to_cpu(fe->i_clusters));
+ status = -EIO;
+ goto bail;
+ }
+ el->l_recs[i].e_blkno = cpu_to_le64(start_blk);
+ el->l_recs[i].e_clusters = cpu_to_le32(new_clusters);
+ } else {
+ /* No contiguous record, or no empty record at eof, so
+ * we add a new one. */
+
+ BUG_ON(le16_to_cpu(el->l_next_free_rec) >=
+ le16_to_cpu(el->l_count));
+ i = le16_to_cpu(el->l_next_free_rec);
+
+ el->l_recs[i].e_blkno = cpu_to_le64(start_blk);
+ el->l_recs[i].e_clusters = cpu_to_le32(new_clusters);
+ el->l_recs[i].e_cpos = fe->i_clusters;
+ le16_add_cpu(&el->l_next_free_rec, 1);
+ }
+
+ /*
+ * extent_map errors are not fatal, so they are ignored outside
+ * of flushing the thing.
+ */
+ status = ocfs2_extent_map_append(inode, &el->l_recs[i],
+ new_clusters);
+ if (status) {
+ mlog_errno(status);
+ ocfs2_extent_map_drop(inode, le32_to_cpu(fe->i_clusters));
+ }
+
+ status = ocfs2_journal_dirty(handle, fe_bh);
+ if (status < 0)
+ mlog_errno(status);
+ if (fe->id2.i_list.l_tree_depth) {
+ status = ocfs2_journal_dirty(handle, eb_bhs[num_bhs - 1]);
+ if (status < 0)
+ mlog_errno(status);
+ }
+
+ status = 0;
+bail:
+ if (eb_bhs) {
+ for (i = 0; i < num_bhs; i++)
+ if (eb_bhs[i])
+ brelse(eb_bhs[i]);
+ kfree(eb_bhs);
+ }
+
+ mlog_exit(status);
+ return status;
+}
+
+/*
+ * Should only be called when there is no space left in any of the
+ * leaf nodes. What we want to do is find the lowest tree depth
+ * non-leaf extent block with room for new records. There are three
+ * valid results of this search:
+ *
+ * 1) a lowest extent block is found, then we pass it back in
+ * *lowest_eb_bh and return '0'
+ *
+ * 2) the search fails to find anything, but the dinode has room. We
+ * pass NULL back in *lowest_eb_bh, but still return '0'
+ *
+ * 3) the search fails to find anything AND the dinode is full, in
+ * which case we return > 0
+ *
+ * return status < 0 indicates an error.
+ */
+static int ocfs2_find_branch_target(struct ocfs2_super *osb,
+ struct inode *inode,
+ struct buffer_head *fe_bh,
+ struct buffer_head **target_bh)
+{
+ int status = 0, i;
+ u64 blkno;
+ struct ocfs2_dinode *fe;
+ struct ocfs2_extent_block *eb;
+ struct ocfs2_extent_list *el;
+ struct buffer_head *bh = NULL;
+ struct buffer_head *lowest_bh = NULL;
+
+ mlog_entry_void();
+
+ *target_bh = NULL;
+
+ fe = (struct ocfs2_dinode *) fe_bh->b_data;
+ el = &fe->id2.i_list;
+
+ while(le16_to_cpu(el->l_tree_depth) > 1) {
+ if (le16_to_cpu(el->l_next_free_rec) == 0) {
+ ocfs2_error(inode->i_sb, "Dinode %llu has empty "
+ "extent list (next_free_rec == 0)",
+ (unsigned long long)OCFS2_I(inode)->ip_blkno);
+ status = -EIO;
+ goto bail;
+ }
+ i = le16_to_cpu(el->l_next_free_rec) - 1;
+ blkno = le64_to_cpu(el->l_recs[i].e_blkno);
+ if (!blkno) {
+ ocfs2_error(inode->i_sb, "Dinode %llu has extent "
+ "list where extent # %d has no physical "
+ "block start",
+ (unsigned long long)OCFS2_I(inode)->ip_blkno, i);
+ status = -EIO;
+ goto bail;
+ }
+
+ if (bh) {
+ brelse(bh);
+ bh = NULL;
+ }
+
+ status = ocfs2_read_block(osb, blkno, &bh, OCFS2_BH_CACHED,
+ inode);
+ if (status < 0) {
+ mlog_errno(status);
+ goto bail;
+ }
+
+ eb = (struct ocfs2_extent_block *) bh->b_data;
+ if (!OCFS2_IS_VALID_EXTENT_BLOCK(eb)) {
+ OCFS2_RO_ON_INVALID_EXTENT_BLOCK(inode->i_sb, eb);
+ status = -EIO;
+ goto bail;
+ }
+ el = &eb->h_list;
+
+ if (le16_to_cpu(el->l_next_free_rec) <
+ le16_to_cpu(el->l_count)) {
+ if (lowest_bh)
+ brelse(lowest_bh);
+ lowest_bh = bh;
+ get_bh(lowest_bh);
+ }
+ }
+
+ /* If we didn't find one and the fe doesn't have any room,
+ * then return '1' */
+ if (!lowest_bh
+ && (fe->id2.i_list.l_next_free_rec == fe->id2.i_list.l_count))
+ status = 1;
+
+ *target_bh = lowest_bh;
+bail:
+ if (bh)
+ brelse(bh);
+
+ mlog_exit(status);
+ return status;
+}
+
+/* the caller needs to update fe->i_clusters */
+int ocfs2_insert_extent(struct ocfs2_super *osb,
+ struct ocfs2_journal_handle *handle,
+ struct inode *inode,
+ struct buffer_head *fe_bh,
+ u64 start_blk,
+ u32 new_clusters,
+ struct ocfs2_alloc_context *meta_ac)
+{
+ int status, i, shift;
+ struct buffer_head *last_eb_bh = NULL;
+ struct buffer_head *bh = NULL;
+ struct ocfs2_dinode *fe;
+ struct ocfs2_extent_block *eb;
+ struct ocfs2_extent_list *el;
+
+ mlog_entry_void();
+
+ mlog(0, "add %u clusters starting at block %llu to inode %llu\n",
+ new_clusters, (unsigned long long)start_blk,
+ (unsigned long long)OCFS2_I(inode)->ip_blkno);
+
+ fe = (struct ocfs2_dinode *) fe_bh->b_data;
+ el = &fe->id2.i_list;
+
+ if (el->l_tree_depth) {
+ /* jump to end of tree */
+ status = ocfs2_read_block(osb, le64_to_cpu(fe->i_last_eb_blk),
+ &last_eb_bh, OCFS2_BH_CACHED, inode);
+ if (status < 0) {
+ mlog_exit(status);
+ goto bail;
+ }
+ eb = (struct ocfs2_extent_block *) last_eb_bh->b_data;
+ el = &eb->h_list;
+ }
+
+ /* Can we allocate without adding/shifting tree bits? */
+ i = le16_to_cpu(el->l_next_free_rec) - 1;
+ if (le16_to_cpu(el->l_next_free_rec) == 0
+ || (le16_to_cpu(el->l_next_free_rec) < le16_to_cpu(el->l_count))
+ || le32_to_cpu(el->l_recs[i].e_clusters) == 0
+ || ocfs2_extent_contig(inode, &el->l_recs[i], start_blk))
+ goto out_add;
+
+ mlog(0, "ocfs2_allocate_extent: couldn't do a simple add, traversing "
+ "tree now.\n");
+
+ shift = ocfs2_find_branch_target(osb, inode, fe_bh, &bh);
+ if (shift < 0) {
+ status = shift;
+ mlog_errno(status);
+ goto bail;
+ }
+
+ /* We traveled all the way to the bottom of the allocation tree
+ * and didn't find room for any more extents - we need to add
+ * another tree level */
+ if (shift) {
+ /* if we hit a leaf, we'd better be empty :) */
+ BUG_ON(le16_to_cpu(el->l_next_free_rec) !=
+ le16_to_cpu(el->l_count));
+ BUG_ON(bh);
+ mlog(0, "ocfs2_allocate_extent: need to shift tree depth "
+ "(current = %u)\n",
+ le16_to_cpu(fe->id2.i_list.l_tree_depth));
+
+ /* ocfs2_shift_tree_depth will return us a buffer with
+ * the new extent block (so we can pass that to
+ * ocfs2_add_branch). */
+ status = ocfs2_shift_tree_depth(osb, handle, inode, fe_bh,
+ meta_ac, &bh);
+ if (status < 0) {
+ mlog_errno(status);
+ goto bail;
+ }
+ /* Special case: we have room now if we shifted from
+ * tree_depth 0 */
+ if (fe->id2.i_list.l_tree_depth == cpu_to_le16(1))
+ goto out_add;
+ }
+
+ /* call ocfs2_add_branch to add the final part of the tree with
+ * the new data. */
+ mlog(0, "ocfs2_allocate_extent: add branch. bh = %p\n", bh);
+ status = ocfs2_add_branch(osb, handle, inode, fe_bh, bh, last_eb_bh,
+ meta_ac);
+ if (status < 0) {
+ mlog_errno(status);
+ goto bail;
+ }
+
+out_add:
+ /* Finally, we can add clusters. */
+ status = ocfs2_do_insert_extent(osb, handle, inode, fe_bh,
+ start_blk, new_clusters);
+ if (status < 0)
+ mlog_errno(status);
+
+bail:
+ if (bh)
+ brelse(bh);
+
+ if (last_eb_bh)
+ brelse(last_eb_bh);
+
+ mlog_exit(status);
+ return status;
+}
+
+static inline int ocfs2_truncate_log_needs_flush(struct ocfs2_super *osb)
+{
+ struct buffer_head *tl_bh = osb->osb_tl_bh;
+ struct ocfs2_dinode *di;
+ struct ocfs2_truncate_log *tl;
+
+ di = (struct ocfs2_dinode *) tl_bh->b_data;
+ tl = &di->id2.i_dealloc;
+
+ mlog_bug_on_msg(le16_to_cpu(tl->tl_used) > le16_to_cpu(tl->tl_count),
+ "slot %d, invalid truncate log parameters: used = "
+ "%u, count = %u\n", osb->slot_num,
+ le16_to_cpu(tl->tl_used), le16_to_cpu(tl->tl_count));
+ return le16_to_cpu(tl->tl_used) == le16_to_cpu(tl->tl_count);
+}
+
+static int ocfs2_truncate_log_can_coalesce(struct ocfs2_truncate_log *tl,
+ unsigned int new_start)
+{
+ unsigned int tail_index;
+ unsigned int current_tail;
+
+ /* No records, nothing to coalesce */
+ if (!le16_to_cpu(tl->tl_used))
+ return 0;
+
+ tail_index = le16_to_cpu(tl->tl_used) - 1;
+ current_tail = le32_to_cpu(tl->tl_recs[tail_index].t_start);
+ current_tail += le32_to_cpu(tl->tl_recs[tail_index].t_clusters);
+
+ return current_tail == new_start;
+}
+
+static int ocfs2_truncate_log_append(struct ocfs2_super *osb,
+ struct ocfs2_journal_handle *handle,
+ u64 start_blk,
+ unsigned int num_clusters)
+{
+ int status, index;
+ unsigned int start_cluster, tl_count;
+ struct inode *tl_inode = osb->osb_tl_inode;
+ struct buffer_head *tl_bh = osb->osb_tl_bh;
+ struct ocfs2_dinode *di;
+ struct ocfs2_truncate_log *tl;
+
+ mlog_entry("start_blk = %llu, num_clusters = %u\n",
+ (unsigned long long)start_blk, num_clusters);
+
+ BUG_ON(mutex_trylock(&tl_inode->i_mutex));
+
+ start_cluster = ocfs2_blocks_to_clusters(osb->sb, start_blk);
+
+ di = (struct ocfs2_dinode *) tl_bh->b_data;
+ tl = &di->id2.i_dealloc;
+ if (!OCFS2_IS_VALID_DINODE(di)) {
+ OCFS2_RO_ON_INVALID_DINODE(osb->sb, di);
+ status = -EIO;
+ goto bail;
+ }
+
+ tl_count = le16_to_cpu(tl->tl_count);
+ mlog_bug_on_msg(tl_count > ocfs2_truncate_recs_per_inode(osb->sb) ||
+ tl_count == 0,
+ "Truncate record count on #%llu invalid "
+ "wanted %u, actual %u\n",
+ (unsigned long long)OCFS2_I(tl_inode)->ip_blkno,
+ ocfs2_truncate_recs_per_inode(osb->sb),
+ le16_to_cpu(tl->tl_count));
+
+ /* Caller should have known to flush before calling us. */
+ index = le16_to_cpu(tl->tl_used);
+ if (index >= tl_count) {
+ status = -ENOSPC;
+ mlog_errno(status);
+ goto bail;
+ }
+
+ status = ocfs2_journal_access(handle, tl_inode, tl_bh,
+ OCFS2_JOURNAL_ACCESS_WRITE);
+ if (status < 0) {
+ mlog_errno(status);
+ goto bail;
+ }
+
+ mlog(0, "Log truncate of %u clusters starting at cluster %u to "
+ "%llu (index = %d)\n", num_clusters, start_cluster,
+ (unsigned long long)OCFS2_I(tl_inode)->ip_blkno, index);
+
+ if (ocfs2_truncate_log_can_coalesce(tl, start_cluster)) {
+ /*
+ * Move index back to the record we are coalescing with.
+ * ocfs2_truncate_log_can_coalesce() guarantees nonzero
+ */
+ index--;
+
+ num_clusters += le32_to_cpu(tl->tl_recs[index].t_clusters);
+ mlog(0, "Coalesce with index %u (start = %u, clusters = %u)\n",
+ index, le32_to_cpu(tl->tl_recs[index].t_start),
+ num_clusters);
+ } else {
+ tl->tl_recs[index].t_start = cpu_to_le32(start_cluster);
+ tl->tl_used = cpu_to_le16(index + 1);
+ }
+ tl->tl_recs[index].t_clusters = cpu_to_le32(num_clusters);
+
+ status = ocfs2_journal_dirty(handle, tl_bh);
+ if (status < 0) {
+ mlog_errno(status);
+ goto bail;
+ }
+
+bail:
+ mlog_exit(status);
+ return status;
+}
+
+static int ocfs2_replay_truncate_records(struct ocfs2_super *osb,
+ struct ocfs2_journal_handle *handle,
+ struct inode *data_alloc_inode,
+ struct buffer_head *data_alloc_bh)
+{
+ int status = 0;
+ int i;
+ unsigned int num_clusters;
+ u64 start_blk;
+ struct ocfs2_truncate_rec rec;
+ struct ocfs2_dinode *di;
+ struct ocfs2_truncate_log *tl;
+ struct inode *tl_inode = osb->osb_tl_inode;
+ struct buffer_head *tl_bh = osb->osb_tl_bh;
+
+ mlog_entry_void();
+
+ di = (struct ocfs2_dinode *) tl_bh->b_data;
+ tl = &di->id2.i_dealloc;
+ i = le16_to_cpu(tl->tl_used) - 1;
+ while (i >= 0) {
+ /* Caller has given us at least enough credits to
+ * update the truncate log dinode */
+ status = ocfs2_journal_access(handle, tl_inode, tl_bh,
+ OCFS2_JOURNAL_ACCESS_WRITE);
+ if (status < 0) {
+ mlog_errno(status);
+ goto bail;
+ }
+
+ tl->tl_used = cpu_to_le16(i);
+
+ status = ocfs2_journal_dirty(handle, tl_bh);
+ if (status < 0) {
+ mlog_errno(status);
+ goto bail;
+ }
+
+ /* TODO: Perhaps we can calculate the bulk of the
+ * credits up front rather than extending like
+ * this. */
+ status = ocfs2_extend_trans(handle,
+ OCFS2_TRUNCATE_LOG_FLUSH_ONE_REC);
+ if (status < 0) {
+ mlog_errno(status);
+ goto bail;
+ }
+
+ rec = tl->tl_recs[i];
+ start_blk = ocfs2_clusters_to_blocks(data_alloc_inode->i_sb,
+ le32_to_cpu(rec.t_start));
+ num_clusters = le32_to_cpu(rec.t_clusters);
+
+ /* if start_blk is not set, we ignore the record as
+ * invalid. */
+ if (start_blk) {
+ mlog(0, "free record %d, start = %u, clusters = %u\n",
+ i, le32_to_cpu(rec.t_start), num_clusters);
+
+ status = ocfs2_free_clusters(handle, data_alloc_inode,
+ data_alloc_bh, start_blk,
+ num_clusters);
+ if (status < 0) {
+ mlog_errno(status);
+ goto bail;
+ }
+ }
+ i--;
+ }
+
+bail:
+ mlog_exit(status);
+ return status;
+}
+
+/* Expects you to already be holding tl_inode->i_mutex */
+static int __ocfs2_flush_truncate_log(struct ocfs2_super *osb)
+{
+ int status;
+ unsigned int num_to_flush;
+ struct ocfs2_journal_handle *handle = NULL;
+ struct inode *tl_inode = osb->osb_tl_inode;
+ struct inode *data_alloc_inode = NULL;
+ struct buffer_head *tl_bh = osb->osb_tl_bh;
+ struct buffer_head *data_alloc_bh = NULL;
+ struct ocfs2_dinode *di;
+ struct ocfs2_truncate_log *tl;
+
+ mlog_entry_void();
+
+ BUG_ON(mutex_trylock(&tl_inode->i_mutex));
+
+ di = (struct ocfs2_dinode *) tl_bh->b_data;
+ tl = &di->id2.i_dealloc;
+ if (!OCFS2_IS_VALID_DINODE(di)) {
+ OCFS2_RO_ON_INVALID_DINODE(osb->sb, di);
+ status = -EIO;
+ goto bail;
+ }
+
+ num_to_flush = le16_to_cpu(tl->tl_used);
+ mlog(0, "Flush %u records from truncate log #%llu\n",
+ num_to_flush, (unsigned long long)OCFS2_I(tl_inode)->ip_blkno);
+ if (!num_to_flush) {
+ status = 0;
+ goto bail;
+ }
+
+ handle = ocfs2_alloc_handle(osb);
+ if (!handle) {
+ status = -ENOMEM;
+ mlog_errno(status);
+ goto bail;
+ }
+
+ data_alloc_inode = ocfs2_get_system_file_inode(osb,
+ GLOBAL_BITMAP_SYSTEM_INODE,
+ OCFS2_INVALID_SLOT);
+ if (!data_alloc_inode) {
+ status = -EINVAL;
+ mlog(ML_ERROR, "Could not get bitmap inode!\n");
+ goto bail;
+ }
+
+ ocfs2_handle_add_inode(handle, data_alloc_inode);
+ status = ocfs2_meta_lock(data_alloc_inode, handle, &data_alloc_bh, 1);
+ if (status < 0) {
+ mlog_errno(status);
+ goto bail;
+ }
+
+ handle = ocfs2_start_trans(osb, handle, OCFS2_TRUNCATE_LOG_UPDATE);
+ if (IS_ERR(handle)) {
+ status = PTR_ERR(handle);
+ handle = NULL;
+ mlog_errno(status);
+ goto bail;
+ }
+
+ status = ocfs2_replay_truncate_records(osb, handle, data_alloc_inode,
+ data_alloc_bh);
+ if (status < 0) {
+ mlog_errno(status);
+ goto bail;
+ }
+
+bail:
+ if (handle)
+ ocfs2_commit_trans(handle);
+
+ if (data_alloc_inode)
+ iput(data_alloc_inode);
+
+ if (data_alloc_bh)
+ brelse(data_alloc_bh);
+
+ mlog_exit(status);
+ return status;
+}
+
+int ocfs2_flush_truncate_log(struct ocfs2_super *osb)
+{
+ int status;
+ struct inode *tl_inode = osb->osb_tl_inode;
+
+ mutex_lock(&tl_inode->i_mutex);
+ status = __ocfs2_flush_truncate_log(osb);
+ mutex_unlock(&tl_inode->i_mutex);
+
+ return status;
+}
+
+static void ocfs2_truncate_log_worker(void *data)
+{
+ int status;
+ struct ocfs2_super *osb = data;
+
+ mlog_entry_void();
+
+ status = ocfs2_flush_truncate_log(osb);
+ if (status < 0)
+ mlog_errno(status);
+
+ mlog_exit(status);
+}
+
+#define OCFS2_TRUNCATE_LOG_FLUSH_INTERVAL (2 * HZ)
+void ocfs2_schedule_truncate_log_flush(struct ocfs2_super *osb,
+ int cancel)
+{
+ if (osb->osb_tl_inode) {
+ /* We want to push off log flushes while truncates are
+ * still running. */
+ if (cancel)
+ cancel_delayed_work(&osb->osb_truncate_log_wq);
+
+ queue_delayed_work(ocfs2_wq, &osb->osb_truncate_log_wq,
+ OCFS2_TRUNCATE_LOG_FLUSH_INTERVAL);
+ }
+}
+
+static int ocfs2_get_truncate_log_info(struct ocfs2_super *osb,
+ int slot_num,
+ struct inode **tl_inode,
+ struct buffer_head **tl_bh)
+{
+ int status;
+ struct inode *inode = NULL;
+ struct buffer_head *bh = NULL;
+
+ inode = ocfs2_get_system_file_inode(osb,
+ TRUNCATE_LOG_SYSTEM_INODE,
+ slot_num);
+ if (!inode) {
+ status = -EINVAL;
+ mlog(ML_ERROR, "Could not get load truncate log inode!\n");
+ goto bail;
+ }
+
+ status = ocfs2_read_block(osb, OCFS2_I(inode)->ip_blkno, &bh,
+ OCFS2_BH_CACHED, inode);
+ if (status < 0) {
+ iput(inode);
+ mlog_errno(status);
+ goto bail;
+ }
+
+ *tl_inode = inode;
+ *tl_bh = bh;
+bail:
+ mlog_exit(status);
+ return status;
+}
+
+/* called during the 1st stage of node recovery. we stamp a clean
+ * truncate log and pass back a copy for processing later. if the
+ * truncate log does not require processing, a *tl_copy is set to
+ * NULL. */
+int ocfs2_begin_truncate_log_recovery(struct ocfs2_super *osb,
+ int slot_num,
+ struct ocfs2_dinode **tl_copy)
+{
+ int status;
+ struct inode *tl_inode = NULL;
+ struct buffer_head *tl_bh = NULL;
+ struct ocfs2_dinode *di;
+ struct ocfs2_truncate_log *tl;
+
+ *tl_copy = NULL;
+
+ mlog(0, "recover truncate log from slot %d\n", slot_num);
+
+ status = ocfs2_get_truncate_log_info(osb, slot_num, &tl_inode, &tl_bh);
+ if (status < 0) {
+ mlog_errno(status);
+ goto bail;
+ }
+
+ di = (struct ocfs2_dinode *) tl_bh->b_data;
+ tl = &di->id2.i_dealloc;
+ if (!OCFS2_IS_VALID_DINODE(di)) {
+ OCFS2_RO_ON_INVALID_DINODE(tl_inode->i_sb, di);
+ status = -EIO;
+ goto bail;
+ }
+
+ if (le16_to_cpu(tl->tl_used)) {
+ mlog(0, "We'll have %u logs to recover\n",
+ le16_to_cpu(tl->tl_used));
+
+ *tl_copy = kmalloc(tl_bh->b_size, GFP_KERNEL);
+ if (!(*tl_copy)) {
+ status = -ENOMEM;
+ mlog_errno(status);
+ goto bail;
+ }
+
+ /* Assuming the write-out below goes well, this copy
+ * will be passed back to recovery for processing. */
+ memcpy(*tl_copy, tl_bh->b_data, tl_bh->b_size);
+
+ /* All we need to do to clear the truncate log is set
+ * tl_used. */
+ tl->tl_used = 0;
+
+ status = ocfs2_write_block(osb, tl_bh, tl_inode);
+ if (status < 0) {
+ mlog_errno(status);
+ goto bail;
+ }
+ }
+
+bail:
+ if (tl_inode)
+ iput(tl_inode);
+ if (tl_bh)
+ brelse(tl_bh);
+
+ if (status < 0 && (*tl_copy)) {
+ kfree(*tl_copy);
+ *tl_copy = NULL;
+ }
+
+ mlog_exit(status);
+ return status;
+}
+
+int ocfs2_complete_truncate_log_recovery(struct ocfs2_super *osb,
+ struct ocfs2_dinode *tl_copy)
+{
+ int status = 0;
+ int i;
+ unsigned int clusters, num_recs, start_cluster;
+ u64 start_blk;
+ struct ocfs2_journal_handle *handle;
+ struct inode *tl_inode = osb->osb_tl_inode;
+ struct ocfs2_truncate_log *tl;
+
+ mlog_entry_void();
+
+ if (OCFS2_I(tl_inode)->ip_blkno == le64_to_cpu(tl_copy->i_blkno)) {
+ mlog(ML_ERROR, "Asked to recover my own truncate log!\n");
+ return -EINVAL;
+ }
+
+ tl = &tl_copy->id2.i_dealloc;
+ num_recs = le16_to_cpu(tl->tl_used);
+ mlog(0, "cleanup %u records from %llu\n", num_recs,
+ (unsigned long long)tl_copy->i_blkno);
+
+ mutex_lock(&tl_inode->i_mutex);
+ for(i = 0; i < num_recs; i++) {
+ if (ocfs2_truncate_log_needs_flush(osb)) {
+ status = __ocfs2_flush_truncate_log(osb);
+ if (status < 0) {
+ mlog_errno(status);
+ goto bail_up;
+ }
+ }
+
+ handle = ocfs2_start_trans(osb, NULL,
+ OCFS2_TRUNCATE_LOG_UPDATE);
+ if (IS_ERR(handle)) {
+ status = PTR_ERR(handle);
+ mlog_errno(status);
+ goto bail_up;
+ }
+
+ clusters = le32_to_cpu(tl->tl_recs[i].t_clusters);
+ start_cluster = le32_to_cpu(tl->tl_recs[i].t_start);
+ start_blk = ocfs2_clusters_to_blocks(osb->sb, start_cluster);
+
+ status = ocfs2_truncate_log_append(osb, handle,
+ start_blk, clusters);
+ ocfs2_commit_trans(handle);
+ if (status < 0) {
+ mlog_errno(status);
+ goto bail_up;
+ }
+ }
+
+bail_up:
+ mutex_unlock(&tl_inode->i_mutex);
+
+ mlog_exit(status);
+ return status;
+}
+
+void ocfs2_truncate_log_shutdown(struct ocfs2_super *osb)
+{
+ int status;
+ struct inode *tl_inode = osb->osb_tl_inode;
+
+ mlog_entry_void();
+
+ if (tl_inode) {
+ cancel_delayed_work(&osb->osb_truncate_log_wq);
+ flush_workqueue(ocfs2_wq);
+
+ status = ocfs2_flush_truncate_log(osb);
+ if (status < 0)
+ mlog_errno(status);
+
+ brelse(osb->osb_tl_bh);
+ iput(osb->osb_tl_inode);
+ }
+
+ mlog_exit_void();
+}
+
+int ocfs2_truncate_log_init(struct ocfs2_super *osb)
+{
+ int status;
+ struct inode *tl_inode = NULL;
+ struct buffer_head *tl_bh = NULL;
+
+ mlog_entry_void();
+
+ status = ocfs2_get_truncate_log_info(osb,
+ osb->slot_num,
+ &tl_inode,
+ &tl_bh);
+ if (status < 0)
+ mlog_errno(status);
+
+ /* ocfs2_truncate_log_shutdown keys on the existence of
+ * osb->osb_tl_inode so we don't set any of the osb variables
+ * until we're sure all is well. */
+ INIT_WORK(&osb->osb_truncate_log_wq, ocfs2_truncate_log_worker, osb);
+ osb->osb_tl_bh = tl_bh;
+ osb->osb_tl_inode = tl_inode;
+
+ mlog_exit(status);
+ return status;
+}
+
+/* This function will figure out whether the currently last extent
+ * block will be deleted, and if it will, what the new last extent
+ * block will be so we can update his h_next_leaf_blk field, as well
+ * as the dinodes i_last_eb_blk */
+static int ocfs2_find_new_last_ext_blk(struct ocfs2_super *osb,
+ struct inode *inode,
+ struct ocfs2_dinode *fe,
+ u32 new_i_clusters,
+ struct buffer_head *old_last_eb,
+ struct buffer_head **new_last_eb)
+{
+ int i, status = 0;
+ u64 block = 0;
+ struct ocfs2_extent_block *eb;
+ struct ocfs2_extent_list *el;
+ struct buffer_head *bh = NULL;
+
+ *new_last_eb = NULL;
+
+ if (!OCFS2_IS_VALID_DINODE(fe)) {
+ OCFS2_RO_ON_INVALID_DINODE(inode->i_sb, fe);
+ status = -EIO;
+ goto bail;
+ }
+
+ /* we have no tree, so of course, no last_eb. */
+ if (!fe->id2.i_list.l_tree_depth)
+ goto bail;
+
+ /* trunc to zero special case - this makes tree_depth = 0
+ * regardless of what it is. */
+ if (!new_i_clusters)
+ goto bail;
+
+ eb = (struct ocfs2_extent_block *) old_last_eb->b_data;
+ el = &(eb->h_list);
+ BUG_ON(!el->l_next_free_rec);
+
+ /* Make sure that this guy will actually be empty after we
+ * clear away the data. */
+ if (le32_to_cpu(el->l_recs[0].e_cpos) < new_i_clusters)
+ goto bail;
+
+ /* Ok, at this point, we know that last_eb will definitely
+ * change, so lets traverse the tree and find the second to
+ * last extent block. */
+ el = &(fe->id2.i_list);
+ /* go down the tree, */
+ do {
+ for(i = (le16_to_cpu(el->l_next_free_rec) - 1); i >= 0; i--) {
+ if (le32_to_cpu(el->l_recs[i].e_cpos) <
+ new_i_clusters) {
+ block = le64_to_cpu(el->l_recs[i].e_blkno);
+ break;
+ }
+ }
+ BUG_ON(i < 0);
+
+ if (bh) {
+ brelse(bh);
+ bh = NULL;
+ }
+
+ status = ocfs2_read_block(osb, block, &bh, OCFS2_BH_CACHED,
+ inode);
+ if (status < 0) {
+ mlog_errno(status);
+ goto bail;
+ }
+ eb = (struct ocfs2_extent_block *) bh->b_data;
+ el = &eb->h_list;
+ if (!OCFS2_IS_VALID_EXTENT_BLOCK(eb)) {
+ OCFS2_RO_ON_INVALID_EXTENT_BLOCK(inode->i_sb, eb);
+ status = -EIO;
+ goto bail;
+ }
+ } while (el->l_tree_depth);
+
+ *new_last_eb = bh;
+ get_bh(*new_last_eb);
+ mlog(0, "returning block %llu\n",
+ (unsigned long long)le64_to_cpu(eb->h_blkno));
+bail:
+ if (bh)
+ brelse(bh);
+
+ return status;
+}
+
+static int ocfs2_do_truncate(struct ocfs2_super *osb,
+ unsigned int clusters_to_del,
+ struct inode *inode,
+ struct buffer_head *fe_bh,
+ struct buffer_head *old_last_eb_bh,
+ struct ocfs2_journal_handle *handle,
+ struct ocfs2_truncate_context *tc)
+{
+ int status, i, depth;
+ struct ocfs2_dinode *fe;
+ struct ocfs2_extent_block *eb;
+ struct ocfs2_extent_block *last_eb = NULL;
+ struct ocfs2_extent_list *el;
+ struct buffer_head *eb_bh = NULL;
+ struct buffer_head *last_eb_bh = NULL;
+ u64 next_eb = 0;
+ u64 delete_blk = 0;
+
+ fe = (struct ocfs2_dinode *) fe_bh->b_data;
+
+ status = ocfs2_find_new_last_ext_blk(osb,
+ inode,
+ fe,
+ le32_to_cpu(fe->i_clusters) -
+ clusters_to_del,
+ old_last_eb_bh,
+ &last_eb_bh);
+ if (status < 0) {
+ mlog_errno(status);
+ goto bail;
+ }
+ if (last_eb_bh)
+ last_eb = (struct ocfs2_extent_block *) last_eb_bh->b_data;
+
+ status = ocfs2_journal_access(handle, inode, fe_bh,
+ OCFS2_JOURNAL_ACCESS_WRITE);
+ if (status < 0) {
+ mlog_errno(status);
+ goto bail;
+ }
+ el = &(fe->id2.i_list);
+
+ spin_lock(&OCFS2_I(inode)->ip_lock);
+ OCFS2_I(inode)->ip_clusters = le32_to_cpu(fe->i_clusters) -
+ clusters_to_del;
+ spin_unlock(&OCFS2_I(inode)->ip_lock);
+ le32_add_cpu(&fe->i_clusters, -clusters_to_del);
+ fe->i_mtime = cpu_to_le64(CURRENT_TIME.tv_sec);
+ fe->i_mtime_nsec = cpu_to_le32(CURRENT_TIME.tv_nsec);
+
+ i = le16_to_cpu(el->l_next_free_rec) - 1;
+
+ BUG_ON(le32_to_cpu(el->l_recs[i].e_clusters) < clusters_to_del);
+ le32_add_cpu(&el->l_recs[i].e_clusters, -clusters_to_del);
+ /* tree depth zero, we can just delete the clusters, otherwise
+ * we need to record the offset of the next level extent block
+ * as we may overwrite it. */
+ if (!el->l_tree_depth)
+ delete_blk = le64_to_cpu(el->l_recs[i].e_blkno)
+ + ocfs2_clusters_to_blocks(osb->sb,
+ le32_to_cpu(el->l_recs[i].e_clusters));
+ else
+ next_eb = le64_to_cpu(el->l_recs[i].e_blkno);
+
+ if (!el->l_recs[i].e_clusters) {
+ /* if we deleted the whole extent record, then clear
+ * out the other fields and update the extent
+ * list. For depth > 0 trees, we've already recorded
+ * the extent block in 'next_eb' */
+ el->l_recs[i].e_cpos = 0;
+ el->l_recs[i].e_blkno = 0;
+ BUG_ON(!el->l_next_free_rec);
+ le16_add_cpu(&el->l_next_free_rec, -1);
+ }
+
+ depth = le16_to_cpu(el->l_tree_depth);
+ if (!fe->i_clusters) {
+ /* trunc to zero is a special case. */
+ el->l_tree_depth = 0;
+ fe->i_last_eb_blk = 0;
+ } else if (last_eb)
+ fe->i_last_eb_blk = last_eb->h_blkno;
+
+ status = ocfs2_journal_dirty(handle, fe_bh);
+ if (status < 0) {
+ mlog_errno(status);
+ goto bail;
+ }
+
+ if (last_eb) {
+ /* If there will be a new last extent block, then by
+ * definition, there cannot be any leaves to the right of
+ * him. */
+ status = ocfs2_journal_access(handle, inode, last_eb_bh,
+ OCFS2_JOURNAL_ACCESS_WRITE);
+ if (status < 0) {
+ mlog_errno(status);
+ goto bail;
+ }
+ last_eb->h_next_leaf_blk = 0;
+ status = ocfs2_journal_dirty(handle, last_eb_bh);
+ if (status < 0) {
+ mlog_errno(status);
+ goto bail;
+ }
+ }
+
+ /* if our tree depth > 0, update all the tree blocks below us. */
+ while (depth) {
+ mlog(0, "traveling tree (depth = %d, next_eb = %llu)\n",
+ depth, (unsigned long long)next_eb);
+ status = ocfs2_read_block(osb, next_eb, &eb_bh,
+ OCFS2_BH_CACHED, inode);
+ if (status < 0) {
+ mlog_errno(status);
+ goto bail;
+ }
+ eb = (struct ocfs2_extent_block *)eb_bh->b_data;
+ if (!OCFS2_IS_VALID_EXTENT_BLOCK(eb)) {
+ OCFS2_RO_ON_INVALID_EXTENT_BLOCK(inode->i_sb, eb);
+ status = -EIO;
+ goto bail;
+ }
+ el = &(eb->h_list);
+
+ status = ocfs2_journal_access(handle, inode, eb_bh,
+ OCFS2_JOURNAL_ACCESS_WRITE);
+ if (status < 0) {
+ mlog_errno(status);
+ goto bail;
+ }
+
+ BUG_ON(le16_to_cpu(el->l_next_free_rec) == 0);
+ BUG_ON(depth != (le16_to_cpu(el->l_tree_depth) + 1));
+
+ i = le16_to_cpu(el->l_next_free_rec) - 1;
+
+ mlog(0, "extent block %llu, before: record %d: "
+ "(%u, %u, %llu), next = %u\n",
+ (unsigned long long)le64_to_cpu(eb->h_blkno), i,
+ le32_to_cpu(el->l_recs[i].e_cpos),
+ le32_to_cpu(el->l_recs[i].e_clusters),
+ (unsigned long long)le64_to_cpu(el->l_recs[i].e_blkno),
+ le16_to_cpu(el->l_next_free_rec));
+
+ BUG_ON(le32_to_cpu(el->l_recs[i].e_clusters) < clusters_to_del);
+ le32_add_cpu(&el->l_recs[i].e_clusters, -clusters_to_del);
+
+ next_eb = le64_to_cpu(el->l_recs[i].e_blkno);
+ /* bottom-most block requires us to delete data.*/
+ if (!el->l_tree_depth)
+ delete_blk = le64_to_cpu(el->l_recs[i].e_blkno)
+ + ocfs2_clusters_to_blocks(osb->sb,
+ le32_to_cpu(el->l_recs[i].e_clusters));
+ if (!el->l_recs[i].e_clusters) {
+ el->l_recs[i].e_cpos = 0;
+ el->l_recs[i].e_blkno = 0;
+ BUG_ON(!el->l_next_free_rec);
+ le16_add_cpu(&el->l_next_free_rec, -1);
+ }
+ mlog(0, "extent block %llu, after: record %d: "
+ "(%u, %u, %llu), next = %u\n",
+ (unsigned long long)le64_to_cpu(eb->h_blkno), i,
+ le32_to_cpu(el->l_recs[i].e_cpos),
+ le32_to_cpu(el->l_recs[i].e_clusters),
+ (unsigned long long)le64_to_cpu(el->l_recs[i].e_blkno),
+ le16_to_cpu(el->l_next_free_rec));
+
+ status = ocfs2_journal_dirty(handle, eb_bh);
+ if (status < 0) {
+ mlog_errno(status);
+ goto bail;
+ }
+
+ if (!el->l_next_free_rec) {
+ mlog(0, "deleting this extent block.\n");
+
+ ocfs2_remove_from_cache(inode, eb_bh);
+
+ BUG_ON(eb->h_suballoc_slot);
+ BUG_ON(el->l_recs[0].e_clusters);
+ BUG_ON(el->l_recs[0].e_cpos);
+ BUG_ON(el->l_recs[0].e_blkno);
+ status = ocfs2_free_extent_block(handle,
+ tc->tc_ext_alloc_inode,
+ tc->tc_ext_alloc_bh,
+ eb);
+ if (status < 0) {
+ mlog_errno(status);
+ goto bail;
+ }
+ }
+ brelse(eb_bh);
+ eb_bh = NULL;
+ depth--;
+ }
+
+ BUG_ON(!delete_blk);
+ status = ocfs2_truncate_log_append(osb, handle, delete_blk,
+ clusters_to_del);
+ if (status < 0) {
+ mlog_errno(status);
+ goto bail;
+ }
+ status = 0;
+bail:
+ if (!status)
+ ocfs2_extent_map_trunc(inode, le32_to_cpu(fe->i_clusters));
+ else
+ ocfs2_extent_map_drop(inode, 0);
+ mlog_exit(status);
+ return status;
+}
+
+/*
+ * It is expected, that by the time you call this function,
+ * inode->i_size and fe->i_size have been adjusted.
+ *
+ * WARNING: This will kfree the truncate context
+ */
+int ocfs2_commit_truncate(struct ocfs2_super *osb,
+ struct inode *inode,
+ struct buffer_head *fe_bh,
+ struct ocfs2_truncate_context *tc)
+{
+ int status, i, credits, tl_sem = 0;
+ u32 clusters_to_del, target_i_clusters;
+ u64 last_eb = 0;
+ struct ocfs2_dinode *fe;
+ struct ocfs2_extent_block *eb;
+ struct ocfs2_extent_list *el;
+ struct buffer_head *last_eb_bh;
+ struct ocfs2_journal_handle *handle = NULL;
+ struct inode *tl_inode = osb->osb_tl_inode;
+
+ mlog_entry_void();
+
+ down_write(&OCFS2_I(inode)->ip_alloc_sem);
+
+ target_i_clusters = ocfs2_clusters_for_bytes(osb->sb,
+ i_size_read(inode));
+
+ last_eb_bh = tc->tc_last_eb_bh;
+ tc->tc_last_eb_bh = NULL;
+
+ fe = (struct ocfs2_dinode *) fe_bh->b_data;
+
+ if (fe->id2.i_list.l_tree_depth) {
+ eb = (struct ocfs2_extent_block *) last_eb_bh->b_data;
+ el = &eb->h_list;
+ } else
+ el = &fe->id2.i_list;
+ last_eb = le64_to_cpu(fe->i_last_eb_blk);
+start:
+ mlog(0, "ocfs2_commit_truncate: fe->i_clusters = %u, "
+ "last_eb = %llu, fe->i_last_eb_blk = %llu, "
+ "fe->id2.i_list.l_tree_depth = %u last_eb_bh = %p\n",
+ le32_to_cpu(fe->i_clusters), (unsigned long long)last_eb,
+ (unsigned long long)le64_to_cpu(fe->i_last_eb_blk),
+ le16_to_cpu(fe->id2.i_list.l_tree_depth), last_eb_bh);
+
+ if (last_eb != le64_to_cpu(fe->i_last_eb_blk)) {
+ mlog(0, "last_eb changed!\n");
+ BUG_ON(!fe->id2.i_list.l_tree_depth);
+ last_eb = le64_to_cpu(fe->i_last_eb_blk);
+ /* i_last_eb_blk may have changed, read it if
+ * necessary. We don't have to worry about the
+ * truncate to zero case here (where there becomes no
+ * last_eb) because we never loop back after our work
+ * is done. */
+ if (last_eb_bh) {
+ brelse(last_eb_bh);
+ last_eb_bh = NULL;
+ }
+
+ status = ocfs2_read_block(osb, last_eb,
+ &last_eb_bh, OCFS2_BH_CACHED,
+ inode);
+ if (status < 0) {
+ mlog_errno(status);
+ goto bail;
+ }
+ eb = (struct ocfs2_extent_block *) last_eb_bh->b_data;
+ if (!OCFS2_IS_VALID_EXTENT_BLOCK(eb)) {
+ OCFS2_RO_ON_INVALID_EXTENT_BLOCK(inode->i_sb, eb);
+ status = -EIO;
+ goto bail;
+ }
+ el = &(eb->h_list);
+ }
+
+ /* by now, el will point to the extent list on the bottom most
+ * portion of this tree. */
+ i = le16_to_cpu(el->l_next_free_rec) - 1;
+ if (le32_to_cpu(el->l_recs[i].e_cpos) >= target_i_clusters)
+ clusters_to_del = le32_to_cpu(el->l_recs[i].e_clusters);
+ else
+ clusters_to_del = (le32_to_cpu(el->l_recs[i].e_clusters) +
+ le32_to_cpu(el->l_recs[i].e_cpos)) -
+ target_i_clusters;
+
+ mlog(0, "clusters_to_del = %u in this pass\n", clusters_to_del);
+
+ mutex_lock(&tl_inode->i_mutex);
+ tl_sem = 1;
+ /* ocfs2_truncate_log_needs_flush guarantees us at least one
+ * record is free for use. If there isn't any, we flush to get
+ * an empty truncate log. */
+ if (ocfs2_truncate_log_needs_flush(osb)) {
+ status = __ocfs2_flush_truncate_log(osb);
+ if (status < 0) {
+ mlog_errno(status);
+ goto bail;
+ }
+ }
+
+ credits = ocfs2_calc_tree_trunc_credits(osb->sb, clusters_to_del,
+ fe, el);
+ handle = ocfs2_start_trans(osb, NULL, credits);
+ if (IS_ERR(handle)) {
+ status = PTR_ERR(handle);
+ handle = NULL;
+ mlog_errno(status);
+ goto bail;
+ }
+
+ inode->i_ctime = inode->i_mtime = CURRENT_TIME;
+ status = ocfs2_mark_inode_dirty(handle, inode, fe_bh);
+ if (status < 0)
+ mlog_errno(status);
+
+ status = ocfs2_do_truncate(osb, clusters_to_del, inode, fe_bh,
+ last_eb_bh, handle, tc);
+ if (status < 0) {
+ mlog_errno(status);
+ goto bail;
+ }
+
+ mutex_unlock(&tl_inode->i_mutex);
+ tl_sem = 0;
+
+ ocfs2_commit_trans(handle);
+ handle = NULL;
+
+ BUG_ON(le32_to_cpu(fe->i_clusters) < target_i_clusters);
+ if (le32_to_cpu(fe->i_clusters) > target_i_clusters)
+ goto start;
+bail:
+ up_write(&OCFS2_I(inode)->ip_alloc_sem);
+
+ ocfs2_schedule_truncate_log_flush(osb, 1);
+
+ if (tl_sem)
+ mutex_unlock(&tl_inode->i_mutex);
+
+ if (handle)
+ ocfs2_commit_trans(handle);
+
+ if (last_eb_bh)
+ brelse(last_eb_bh);
+
+ /* This will drop the ext_alloc cluster lock for us */
+ ocfs2_free_truncate_context(tc);
+
+ mlog_exit(status);
+ return status;
+}
+
+
+/*
+ * Expects the inode to already be locked. This will figure out which
+ * inodes need to be locked and will put them on the returned truncate
+ * context.
+ */
+int ocfs2_prepare_truncate(struct ocfs2_super *osb,
+ struct inode *inode,
+ struct buffer_head *fe_bh,
+ struct ocfs2_truncate_context **tc)
+{
+ int status, metadata_delete;
+ unsigned int new_i_clusters;
+ struct ocfs2_dinode *fe;
+ struct ocfs2_extent_block *eb;
+ struct ocfs2_extent_list *el;
+ struct buffer_head *last_eb_bh = NULL;
+ struct inode *ext_alloc_inode = NULL;
+ struct buffer_head *ext_alloc_bh = NULL;
+
+ mlog_entry_void();
+
+ *tc = NULL;
+
+ new_i_clusters = ocfs2_clusters_for_bytes(osb->sb,
+ i_size_read(inode));
+ fe = (struct ocfs2_dinode *) fe_bh->b_data;
+
+ mlog(0, "fe->i_clusters = %u, new_i_clusters = %u, fe->i_size ="
+ "%llu\n", fe->i_clusters, new_i_clusters,
+ (unsigned long long)fe->i_size);
+
+ if (le32_to_cpu(fe->i_clusters) <= new_i_clusters) {
+ ocfs2_error(inode->i_sb, "Dinode %llu has cluster count "
+ "%u and size %llu whereas struct inode has "
+ "cluster count %u and size %llu which caused an "
+ "invalid truncate to %u clusters.",
+ (unsigned long long)le64_to_cpu(fe->i_blkno),
+ le32_to_cpu(fe->i_clusters),
+ (unsigned long long)le64_to_cpu(fe->i_size),
+ OCFS2_I(inode)->ip_clusters, i_size_read(inode),
+ new_i_clusters);
+ mlog_meta_lvb(ML_ERROR, &OCFS2_I(inode)->ip_meta_lockres);
+ status = -EIO;
+ goto bail;
+ }
+
+ *tc = kcalloc(1, sizeof(struct ocfs2_truncate_context), GFP_KERNEL);
+ if (!(*tc)) {
+ status = -ENOMEM;
+ mlog_errno(status);
+ goto bail;
+ }
+
+ metadata_delete = 0;
+ if (fe->id2.i_list.l_tree_depth) {
+ /* If we have a tree, then the truncate may result in
+ * metadata deletes. Figure this out from the
+ * rightmost leaf block.*/
+ status = ocfs2_read_block(osb, le64_to_cpu(fe->i_last_eb_blk),
+ &last_eb_bh, OCFS2_BH_CACHED, inode);
+ if (status < 0) {
+ mlog_errno(status);
+ goto bail;
+ }
+ eb = (struct ocfs2_extent_block *) last_eb_bh->b_data;
+ if (!OCFS2_IS_VALID_EXTENT_BLOCK(eb)) {
+ OCFS2_RO_ON_INVALID_EXTENT_BLOCK(inode->i_sb, eb);
+
+ brelse(last_eb_bh);
+ status = -EIO;
+ goto bail;
+ }
+ el = &(eb->h_list);
+ if (le32_to_cpu(el->l_recs[0].e_cpos) >= new_i_clusters)
+ metadata_delete = 1;
+ }
+
+ (*tc)->tc_last_eb_bh = last_eb_bh;
+
+ if (metadata_delete) {
+ mlog(0, "Will have to delete metadata for this trunc. "
+ "locking allocator.\n");
+ ext_alloc_inode = ocfs2_get_system_file_inode(osb, EXTENT_ALLOC_SYSTEM_INODE, 0);
+ if (!ext_alloc_inode) {
+ status = -ENOMEM;
+ mlog_errno(status);
+ goto bail;
+ }
+
+ mutex_lock(&ext_alloc_inode->i_mutex);
+ (*tc)->tc_ext_alloc_inode = ext_alloc_inode;
+
+ status = ocfs2_meta_lock(ext_alloc_inode,
+ NULL,
+ &ext_alloc_bh,
+ 1);
+ if (status < 0) {
+ mlog_errno(status);
+ goto bail;
+ }
+ (*tc)->tc_ext_alloc_bh = ext_alloc_bh;
+ (*tc)->tc_ext_alloc_locked = 1;
+ }
+
+ status = 0;
+bail:
+ if (status < 0) {
+ if (*tc)
+ ocfs2_free_truncate_context(*tc);
+ *tc = NULL;
+ }
+ mlog_exit_void();
+ return status;
+}
+
+static void ocfs2_free_truncate_context(struct ocfs2_truncate_context *tc)
+{
+ if (tc->tc_ext_alloc_inode) {
+ if (tc->tc_ext_alloc_locked)
+ ocfs2_meta_unlock(tc->tc_ext_alloc_inode, 1);
+
+ mutex_unlock(&tc->tc_ext_alloc_inode->i_mutex);
+ iput(tc->tc_ext_alloc_inode);
+ }
+
+ if (tc->tc_ext_alloc_bh)
+ brelse(tc->tc_ext_alloc_bh);
+
+ if (tc->tc_last_eb_bh)
+ brelse(tc->tc_last_eb_bh);
+
+ kfree(tc);
+}
git://git.onelab.eu / linux-2.6.git / blobdiff