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linux/fs/ocfs2/alloc.c
Mark Fasheh eb35746ca5 ocfs2: Remove overzealous BUG_ON() 
The truncate code was never supposed to BUG() on an allocator it doesn't
know about, but rather to ignore it. Right now, this does nothing, but when
we change our allocation paths to use all suballocator files, this will
allow current versions of the fs module to work fine.

Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>
2006-09-20 16:00:54 -07:00

2055 lines
53 KiB
C
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/* -*- 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(el->l_recs[0].e_clusters);
BUG_ON(el->l_recs[0].e_cpos);
BUG_ON(el->l_recs[0].e_blkno);
if (eb->h_suballoc_slot == 0) {
/*
* This code only understands how to
* lock the suballocator in slot 0,
* which is fine because allocation is
* only ever done out of that
* suballocator too. A future version
* might change that however, so avoid
* a free if we don't know how to
* handle it. This way an fs incompat
* bit will not be necessary.
*/
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);
}
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