staging/lustre: remove fsfilt_ext3.c
It is only used by server. Cc: Andreas Dilger <andreas.dilger@intel.com> Signed-off-by: Peng Tao <bergwolf@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Peng Tao
Greg Kroah-Hartman
parent
e964cb969e
commit
bda211d5c1
@ -1,760 +0,0 @@
|
||||
/*
|
||||
* GPL HEADER START
|
||||
*
|
||||
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or modify
|
||||
* it under the terms of the GNU General Public License version 2 only,
|
||||
* as published by the Free Software Foundation.
|
||||
*
|
||||
* 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 version 2 for more details (a copy is included
|
||||
* in the LICENSE file that accompanied this code).
|
||||
*
|
||||
* You should have received a copy of the GNU General Public License
|
||||
* version 2 along with this program; If not, see
|
||||
* http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
|
||||
*
|
||||
* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
|
||||
* CA 95054 USA or visit www.sun.com if you need additional information or
|
||||
* have any questions.
|
||||
*
|
||||
* GPL HEADER END
|
||||
*/
|
||||
/*
|
||||
* Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved.
|
||||
* Use is subject to license terms.
|
||||
*
|
||||
* Copyright (c) 2011, 2012, Intel Corporation.
|
||||
*/
|
||||
/*
|
||||
* This file is part of Lustre, http://www.lustre.org/
|
||||
* Lustre is a trademark of Sun Microsystems, Inc.
|
||||
*
|
||||
* lustre/lvfs/fsfilt_ext3.c
|
||||
*
|
||||
* Author: Andreas Dilger <adilger@clusterfs.com>
|
||||
*/
|
||||
|
||||
#define DEBUG_SUBSYSTEM S_FILTER
|
||||
|
||||
#include <linux/init.h>
|
||||
#include <linux/module.h>
|
||||
#include <linux/fs.h>
|
||||
#include <linux/slab.h>
|
||||
#include <linux/pagemap.h>
|
||||
#include <ldiskfs/ldiskfs_config.h>
|
||||
#include <ext4/ext4.h>
|
||||
#include <ext4/ext4_jbd2.h>
|
||||
#include <linux/bitops.h>
|
||||
#include <linux/quota.h>
|
||||
|
||||
#include <linux/libcfs/libcfs.h>
|
||||
#include <lustre_fsfilt.h>
|
||||
#include <obd.h>
|
||||
#include <linux/lustre_compat25.h>
|
||||
#include <linux/lprocfs_status.h>
|
||||
|
||||
#include <ext4/ext4_extents.h>
|
||||
|
||||
#ifdef HAVE_EXT_PBLOCK /* Name changed to ext4_ext_pblock for kernel 2.6.35 */
|
||||
#define ext3_ext_pblock(ex) ext_pblock((ex))
|
||||
#endif
|
||||
|
||||
/* for kernels 2.6.18 and later */
|
||||
#define FSFILT_SINGLEDATA_TRANS_BLOCKS(sb) EXT3_SINGLEDATA_TRANS_BLOCKS(sb)
|
||||
|
||||
#define fsfilt_ext3_ext_insert_extent(handle, inode, path, newext, flag) \
|
||||
ext3_ext_insert_extent(handle, inode, path, newext, flag)
|
||||
|
||||
#define ext3_mb_discard_inode_preallocations(inode) \
|
||||
ext3_discard_preallocations(inode)
|
||||
|
||||
#define fsfilt_log_start_commit(journal, tid) jbd2_log_start_commit(journal, tid)
|
||||
#define fsfilt_log_wait_commit(journal, tid) jbd2_log_wait_commit(journal, tid)
|
||||
|
||||
static struct kmem_cache *fcb_cache;
|
||||
|
||||
struct fsfilt_cb_data {
|
||||
struct ext4_journal_cb_entry cb_jcb; /* private data - MUST BE FIRST */
|
||||
fsfilt_cb_t cb_func; /* MDS/OBD completion function */
|
||||
struct obd_device *cb_obd; /* MDS/OBD completion device */
|
||||
__u64 cb_last_rcvd; /* MDS/OST last committed operation */
|
||||
void *cb_data; /* MDS/OST completion function data */
|
||||
};
|
||||
|
||||
static char *fsfilt_ext3_get_label(struct super_block *sb)
|
||||
{
|
||||
return EXT3_SB(sb)->s_es->s_volume_name;
|
||||
}
|
||||
|
||||
/* kernel has ext4_blocks_for_truncate since linux-3.1.1 */
|
||||
# include <ext4/truncate.h>
|
||||
|
||||
/*
|
||||
* We don't currently need any additional blocks for rmdir and
|
||||
* unlink transactions because we are storing the OST oa_id inside
|
||||
* the inode (which we will be changing anyways as part of this
|
||||
* transaction).
|
||||
*/
|
||||
static void *fsfilt_ext3_start(struct inode *inode, int op, void *desc_private,
|
||||
int logs)
|
||||
{
|
||||
/* For updates to the last received file */
|
||||
int nblocks = FSFILT_SINGLEDATA_TRANS_BLOCKS(inode->i_sb);
|
||||
journal_t *journal;
|
||||
void *handle;
|
||||
|
||||
if (current->journal_info) {
|
||||
CDEBUG(D_INODE, "increasing refcount on %p\n",
|
||||
current->journal_info);
|
||||
goto journal_start;
|
||||
}
|
||||
|
||||
switch(op) {
|
||||
case FSFILT_OP_UNLINK:
|
||||
/* delete one file + create/update logs for each stripe */
|
||||
nblocks += EXT3_DELETE_TRANS_BLOCKS(inode->i_sb);
|
||||
nblocks += (EXT3_INDEX_EXTRA_TRANS_BLOCKS +
|
||||
FSFILT_SINGLEDATA_TRANS_BLOCKS(inode->i_sb)) * logs;
|
||||
break;
|
||||
case FSFILT_OP_CANCEL_UNLINK:
|
||||
LASSERT(logs == 1);
|
||||
|
||||
/* blocks for log header bitmap update OR
|
||||
* blocks for catalog header bitmap update + unlink of logs +
|
||||
* blocks for delete the inode (include blocks truncating). */
|
||||
nblocks = (LLOG_CHUNK_SIZE >> inode->i_blkbits) +
|
||||
EXT3_DELETE_TRANS_BLOCKS(inode->i_sb) +
|
||||
ext4_blocks_for_truncate(inode) + 3;
|
||||
break;
|
||||
default: CERROR("unknown transaction start op %d\n", op);
|
||||
LBUG();
|
||||
}
|
||||
|
||||
LASSERT(current->journal_info == desc_private);
|
||||
journal = EXT3_SB(inode->i_sb)->s_journal;
|
||||
if (nblocks > journal->j_max_transaction_buffers) {
|
||||
CWARN("too many credits %d for op %ux%u using %d instead\n",
|
||||
nblocks, op, logs, journal->j_max_transaction_buffers);
|
||||
nblocks = journal->j_max_transaction_buffers;
|
||||
}
|
||||
|
||||
journal_start:
|
||||
LASSERTF(nblocks > 0, "can't start %d credit transaction\n", nblocks);
|
||||
handle = ext3_journal_start(inode, nblocks);
|
||||
|
||||
if (!IS_ERR(handle))
|
||||
LASSERT(current->journal_info == handle);
|
||||
else
|
||||
CERROR("error starting handle for op %u (%u credits): rc %ld\n",
|
||||
op, nblocks, PTR_ERR(handle));
|
||||
return handle;
|
||||
}
|
||||
|
||||
static int fsfilt_ext3_commit(struct inode *inode, void *h, int force_sync)
|
||||
{
|
||||
int rc;
|
||||
handle_t *handle = h;
|
||||
|
||||
LASSERT(current->journal_info == handle);
|
||||
if (force_sync)
|
||||
handle->h_sync = 1; /* recovery likes this */
|
||||
|
||||
rc = ext3_journal_stop(handle);
|
||||
|
||||
return rc;
|
||||
}
|
||||
|
||||
#ifndef EXT3_EXTENTS_FL
|
||||
#define EXT3_EXTENTS_FL 0x00080000 /* Inode uses extents */
|
||||
#endif
|
||||
|
||||
#ifndef EXT_ASSERT
|
||||
#define EXT_ASSERT(cond) BUG_ON(!(cond))
|
||||
#endif
|
||||
|
||||
#define EXT_GENERATION(inode) (EXT4_I(inode)->i_ext_generation)
|
||||
#define ext3_ext_base inode
|
||||
#define ext3_ext_base2inode(inode) (inode)
|
||||
#define EXT_DEPTH(inode) ext_depth(inode)
|
||||
#define fsfilt_ext3_ext_walk_space(inode, block, num, cb, cbdata) \
|
||||
ext3_ext_walk_space(inode, block, num, cb, cbdata);
|
||||
|
||||
struct bpointers {
|
||||
unsigned long *blocks;
|
||||
unsigned long start;
|
||||
int num;
|
||||
int init_num;
|
||||
int create;
|
||||
};
|
||||
|
||||
static long ext3_ext_find_goal(struct inode *inode, struct ext3_ext_path *path,
|
||||
unsigned long block, int *aflags)
|
||||
{
|
||||
struct ext3_inode_info *ei = EXT3_I(inode);
|
||||
unsigned long bg_start;
|
||||
unsigned long colour;
|
||||
int depth;
|
||||
|
||||
if (path) {
|
||||
struct ext3_extent *ex;
|
||||
depth = path->p_depth;
|
||||
|
||||
/* try to predict block placement */
|
||||
if ((ex = path[depth].p_ext))
|
||||
return ext4_ext_pblock(ex) + (block - le32_to_cpu(ex->ee_block));
|
||||
|
||||
/* it looks index is empty
|
||||
* try to find starting from index itself */
|
||||
if (path[depth].p_bh)
|
||||
return path[depth].p_bh->b_blocknr;
|
||||
}
|
||||
|
||||
/* OK. use inode's group */
|
||||
bg_start = (ei->i_block_group * EXT3_BLOCKS_PER_GROUP(inode->i_sb)) +
|
||||
le32_to_cpu(EXT3_SB(inode->i_sb)->s_es->s_first_data_block);
|
||||
colour = (current->pid % 16) *
|
||||
(EXT3_BLOCKS_PER_GROUP(inode->i_sb) / 16);
|
||||
return bg_start + colour + block;
|
||||
}
|
||||
|
||||
#define ll_unmap_underlying_metadata(sb, blocknr) \
|
||||
unmap_underlying_metadata((sb)->s_bdev, blocknr)
|
||||
|
||||
#ifndef EXT3_MB_HINT_GROUP_ALLOC
|
||||
static unsigned long new_blocks(handle_t *handle, struct ext3_ext_base *base,
|
||||
struct ext3_ext_path *path, unsigned long block,
|
||||
unsigned long *count, int *err)
|
||||
{
|
||||
unsigned long pblock, goal;
|
||||
int aflags = 0;
|
||||
struct inode *inode = ext3_ext_base2inode(base);
|
||||
|
||||
goal = ext3_ext_find_goal(inode, path, block, &aflags);
|
||||
aflags |= 2; /* block have been already reserved */
|
||||
pblock = ext3_mb_new_blocks(handle, inode, goal, count, aflags, err);
|
||||
return pblock;
|
||||
|
||||
}
|
||||
#else
|
||||
static unsigned long new_blocks(handle_t *handle, struct ext3_ext_base *base,
|
||||
struct ext3_ext_path *path, unsigned long block,
|
||||
unsigned long *count, int *err)
|
||||
{
|
||||
struct inode *inode = ext3_ext_base2inode(base);
|
||||
struct ext3_allocation_request ar;
|
||||
unsigned long pblock;
|
||||
int aflags;
|
||||
|
||||
/* find neighbour allocated blocks */
|
||||
ar.lleft = block;
|
||||
*err = ext3_ext_search_left(base, path, &ar.lleft, &ar.pleft);
|
||||
if (*err)
|
||||
return 0;
|
||||
ar.lright = block;
|
||||
*err = ext3_ext_search_right(base, path, &ar.lright, &ar.pright);
|
||||
if (*err)
|
||||
return 0;
|
||||
|
||||
/* allocate new block */
|
||||
ar.goal = ext3_ext_find_goal(inode, path, block, &aflags);
|
||||
ar.inode = inode;
|
||||
ar.logical = block;
|
||||
ar.len = *count;
|
||||
ar.flags = EXT3_MB_HINT_DATA;
|
||||
pblock = ext3_mb_new_blocks(handle, &ar, err);
|
||||
*count = ar.len;
|
||||
return pblock;
|
||||
}
|
||||
#endif
|
||||
|
||||
static int ext3_ext_new_extent_cb(struct ext3_ext_base *base,
|
||||
struct ext3_ext_path *path,
|
||||
struct ext3_ext_cache *cex,
|
||||
#ifdef HAVE_EXT_PREPARE_CB_EXTENT
|
||||
struct ext3_extent *ex,
|
||||
#endif
|
||||
void *cbdata)
|
||||
{
|
||||
struct bpointers *bp = cbdata;
|
||||
struct inode *inode = ext3_ext_base2inode(base);
|
||||
struct ext3_extent nex;
|
||||
unsigned long pblock;
|
||||
unsigned long tgen;
|
||||
int err, i;
|
||||
unsigned long count;
|
||||
handle_t *handle;
|
||||
|
||||
#ifdef EXT3_EXT_CACHE_EXTENT
|
||||
if (cex->ec_type == EXT3_EXT_CACHE_EXTENT)
|
||||
#else
|
||||
if ((cex->ec_len != 0) && (cex->ec_start != 0))
|
||||
#endif
|
||||
{
|
||||
err = EXT_CONTINUE;
|
||||
goto map;
|
||||
}
|
||||
|
||||
if (bp->create == 0) {
|
||||
i = 0;
|
||||
if (cex->ec_block < bp->start)
|
||||
i = bp->start - cex->ec_block;
|
||||
if (i >= cex->ec_len)
|
||||
CERROR("nothing to do?! i = %d, e_num = %u\n",
|
||||
i, cex->ec_len);
|
||||
for (; i < cex->ec_len && bp->num; i++) {
|
||||
*(bp->blocks) = 0;
|
||||
bp->blocks++;
|
||||
bp->num--;
|
||||
bp->start++;
|
||||
}
|
||||
|
||||
return EXT_CONTINUE;
|
||||
}
|
||||
|
||||
tgen = EXT_GENERATION(base);
|
||||
count = ext3_ext_calc_credits_for_insert(base, path);
|
||||
|
||||
handle = ext3_journal_start(inode, count+EXT3_ALLOC_NEEDED+1);
|
||||
if (IS_ERR(handle)) {
|
||||
return PTR_ERR(handle);
|
||||
}
|
||||
|
||||
if (tgen != EXT_GENERATION(base)) {
|
||||
/* the tree has changed. so path can be invalid at moment */
|
||||
ext3_journal_stop(handle);
|
||||
return EXT_REPEAT;
|
||||
}
|
||||
|
||||
/* In 2.6.32 kernel, ext4_ext_walk_space()'s callback func is not
|
||||
* protected by i_data_sem as whole. so we patch it to store
|
||||
* generation to path and now verify the tree hasn't changed */
|
||||
down_write((&EXT4_I(inode)->i_data_sem));
|
||||
|
||||
/* validate extent, make sure the extent tree does not changed */
|
||||
if (EXT_GENERATION(base) != path[0].p_generation) {
|
||||
/* cex is invalid, try again */
|
||||
up_write(&EXT4_I(inode)->i_data_sem);
|
||||
ext3_journal_stop(handle);
|
||||
return EXT_REPEAT;
|
||||
}
|
||||
|
||||
count = cex->ec_len;
|
||||
pblock = new_blocks(handle, base, path, cex->ec_block, &count, &err);
|
||||
if (!pblock)
|
||||
goto out;
|
||||
EXT_ASSERT(count <= cex->ec_len);
|
||||
|
||||
/* insert new extent */
|
||||
nex.ee_block = cpu_to_le32(cex->ec_block);
|
||||
ext3_ext_store_pblock(&nex, pblock);
|
||||
nex.ee_len = cpu_to_le16(count);
|
||||
err = fsfilt_ext3_ext_insert_extent(handle, base, path, &nex, 0);
|
||||
if (err) {
|
||||
/* free data blocks we just allocated */
|
||||
/* not a good idea to call discard here directly,
|
||||
* but otherwise we'd need to call it every free() */
|
||||
#ifdef EXT3_MB_HINT_GROUP_ALLOC
|
||||
ext3_mb_discard_inode_preallocations(inode);
|
||||
#endif
|
||||
#ifdef HAVE_EXT_FREE_BLOCK_WITH_BUFFER_HEAD /* Introduced in 2.6.32-rc7 */
|
||||
ext3_free_blocks(handle, inode, NULL, ext4_ext_pblock(&nex),
|
||||
cpu_to_le16(nex.ee_len), 0);
|
||||
#else
|
||||
ext3_free_blocks(handle, inode, ext4_ext_pblock(&nex),
|
||||
cpu_to_le16(nex.ee_len), 0);
|
||||
#endif
|
||||
goto out;
|
||||
}
|
||||
|
||||
/*
|
||||
* Putting len of the actual extent we just inserted,
|
||||
* we are asking ext3_ext_walk_space() to continue
|
||||
* scaning after that block
|
||||
*/
|
||||
cex->ec_len = le16_to_cpu(nex.ee_len);
|
||||
cex->ec_start = ext4_ext_pblock(&nex);
|
||||
BUG_ON(le16_to_cpu(nex.ee_len) == 0);
|
||||
BUG_ON(le32_to_cpu(nex.ee_block) != cex->ec_block);
|
||||
|
||||
out:
|
||||
up_write((&EXT4_I(inode)->i_data_sem));
|
||||
ext3_journal_stop(handle);
|
||||
map:
|
||||
if (err >= 0) {
|
||||
/* map blocks */
|
||||
if (bp->num == 0) {
|
||||
CERROR("hmm. why do we find this extent?\n");
|
||||
CERROR("initial space: %lu:%u\n",
|
||||
bp->start, bp->init_num);
|
||||
#ifdef EXT3_EXT_CACHE_EXTENT
|
||||
CERROR("current extent: %u/%u/%llu %d\n",
|
||||
cex->ec_block, cex->ec_len,
|
||||
(unsigned long long)cex->ec_start,
|
||||
cex->ec_type);
|
||||
#else
|
||||
CERROR("current extent: %u/%u/%llu\n",
|
||||
cex->ec_block, cex->ec_len,
|
||||
(unsigned long long)cex->ec_start);
|
||||
#endif
|
||||
}
|
||||
i = 0;
|
||||
if (cex->ec_block < bp->start)
|
||||
i = bp->start - cex->ec_block;
|
||||
if (i >= cex->ec_len)
|
||||
CERROR("nothing to do?! i = %d, e_num = %u\n",
|
||||
i, cex->ec_len);
|
||||
for (; i < cex->ec_len && bp->num; i++) {
|
||||
*(bp->blocks) = cex->ec_start + i;
|
||||
#ifdef EXT3_EXT_CACHE_EXTENT
|
||||
if (cex->ec_type != EXT3_EXT_CACHE_EXTENT)
|
||||
#else
|
||||
if ((cex->ec_len == 0) || (cex->ec_start == 0))
|
||||
#endif
|
||||
{
|
||||
/* unmap any possible underlying metadata from
|
||||
* the block device mapping. bug 6998. */
|
||||
ll_unmap_underlying_metadata(inode->i_sb,
|
||||
*(bp->blocks));
|
||||
}
|
||||
bp->blocks++;
|
||||
bp->num--;
|
||||
bp->start++;
|
||||
}
|
||||
}
|
||||
return err;
|
||||
}
|
||||
|
||||
int fsfilt_map_nblocks(struct inode *inode, unsigned long block,
|
||||
unsigned long num, unsigned long *blocks,
|
||||
int create)
|
||||
{
|
||||
struct ext3_ext_base *base = inode;
|
||||
struct bpointers bp;
|
||||
int err;
|
||||
|
||||
CDEBUG(D_OTHER, "blocks %lu-%lu requested for inode %u\n",
|
||||
block, block + num - 1, (unsigned) inode->i_ino);
|
||||
|
||||
bp.blocks = blocks;
|
||||
bp.start = block;
|
||||
bp.init_num = bp.num = num;
|
||||
bp.create = create;
|
||||
|
||||
err = fsfilt_ext3_ext_walk_space(base, block, num,
|
||||
ext3_ext_new_extent_cb, &bp);
|
||||
ext3_ext_invalidate_cache(base);
|
||||
|
||||
return err;
|
||||
}
|
||||
|
||||
int fsfilt_ext3_map_ext_inode_pages(struct inode *inode, struct page **page,
|
||||
int pages, unsigned long *blocks,
|
||||
int create)
|
||||
{
|
||||
int blocks_per_page = PAGE_CACHE_SIZE >> inode->i_blkbits;
|
||||
int rc = 0, i = 0;
|
||||
struct page *fp = NULL;
|
||||
int clen = 0;
|
||||
|
||||
CDEBUG(D_OTHER, "inode %lu: map %d pages from %lu\n",
|
||||
inode->i_ino, pages, (*page)->index);
|
||||
|
||||
/* pages are sorted already. so, we just have to find
|
||||
* contig. space and process them properly */
|
||||
while (i < pages) {
|
||||
if (fp == NULL) {
|
||||
/* start new extent */
|
||||
fp = *page++;
|
||||
clen = 1;
|
||||
i++;
|
||||
continue;
|
||||
} else if (fp->index + clen == (*page)->index) {
|
||||
/* continue the extent */
|
||||
page++;
|
||||
clen++;
|
||||
i++;
|
||||
continue;
|
||||
}
|
||||
|
||||
/* process found extent */
|
||||
rc = fsfilt_map_nblocks(inode, fp->index * blocks_per_page,
|
||||
clen * blocks_per_page, blocks,
|
||||
create);
|
||||
if (rc)
|
||||
GOTO(cleanup, rc);
|
||||
|
||||
/* look for next extent */
|
||||
fp = NULL;
|
||||
blocks += blocks_per_page * clen;
|
||||
}
|
||||
|
||||
if (fp)
|
||||
rc = fsfilt_map_nblocks(inode, fp->index * blocks_per_page,
|
||||
clen * blocks_per_page, blocks,
|
||||
create);
|
||||
cleanup:
|
||||
return rc;
|
||||
}
|
||||
|
||||
int fsfilt_ext3_map_bm_inode_pages(struct inode *inode, struct page **page,
|
||||
int pages, unsigned long *blocks,
|
||||
int create)
|
||||
{
|
||||
int blocks_per_page = PAGE_CACHE_SIZE >> inode->i_blkbits;
|
||||
unsigned long *b;
|
||||
int rc = 0, i;
|
||||
|
||||
for (i = 0, b = blocks; i < pages; i++, page++) {
|
||||
rc = ext3_map_inode_page(inode, *page, b, create);
|
||||
if (rc) {
|
||||
CERROR("ino %lu, blk %lu create %d: rc %d\n",
|
||||
inode->i_ino, *b, create, rc);
|
||||
break;
|
||||
}
|
||||
|
||||
b += blocks_per_page;
|
||||
}
|
||||
return rc;
|
||||
}
|
||||
|
||||
int fsfilt_ext3_map_inode_pages(struct inode *inode, struct page **page,
|
||||
int pages, unsigned long *blocks,
|
||||
int create, struct mutex *optional_mutex)
|
||||
{
|
||||
int rc;
|
||||
|
||||
if (EXT3_I(inode)->i_flags & EXT3_EXTENTS_FL) {
|
||||
rc = fsfilt_ext3_map_ext_inode_pages(inode, page, pages,
|
||||
blocks, create);
|
||||
return rc;
|
||||
}
|
||||
if (optional_mutex != NULL)
|
||||
mutex_lock(optional_mutex);
|
||||
rc = fsfilt_ext3_map_bm_inode_pages(inode, page, pages, blocks, create);
|
||||
if (optional_mutex != NULL)
|
||||
mutex_unlock(optional_mutex);
|
||||
|
||||
return rc;
|
||||
}
|
||||
|
||||
int fsfilt_ext3_read(struct inode *inode, void *buf, int size, loff_t *offs)
|
||||
{
|
||||
unsigned long block;
|
||||
struct buffer_head *bh;
|
||||
int err, blocksize, csize, boffs, osize = size;
|
||||
|
||||
/* prevent reading after eof */
|
||||
spin_lock(&inode->i_lock);
|
||||
if (i_size_read(inode) < *offs + size) {
|
||||
size = i_size_read(inode) - *offs;
|
||||
spin_unlock(&inode->i_lock);
|
||||
if (size < 0) {
|
||||
CDEBUG(D_EXT2, "size %llu is too short for read @%llu\n",
|
||||
i_size_read(inode), *offs);
|
||||
return -EBADR;
|
||||
} else if (size == 0) {
|
||||
return 0;
|
||||
}
|
||||
} else {
|
||||
spin_unlock(&inode->i_lock);
|
||||
}
|
||||
|
||||
blocksize = 1 << inode->i_blkbits;
|
||||
|
||||
while (size > 0) {
|
||||
block = *offs >> inode->i_blkbits;
|
||||
boffs = *offs & (blocksize - 1);
|
||||
csize = min(blocksize - boffs, size);
|
||||
bh = ext3_bread(NULL, inode, block, 0, &err);
|
||||
if (!bh) {
|
||||
CERROR("can't read block: %d\n", err);
|
||||
return err;
|
||||
}
|
||||
|
||||
memcpy(buf, bh->b_data + boffs, csize);
|
||||
brelse(bh);
|
||||
|
||||
*offs += csize;
|
||||
buf += csize;
|
||||
size -= csize;
|
||||
}
|
||||
return osize;
|
||||
}
|
||||
EXPORT_SYMBOL(fsfilt_ext3_read);
|
||||
|
||||
static int fsfilt_ext3_read_record(struct file * file, void *buf,
|
||||
int size, loff_t *offs)
|
||||
{
|
||||
int rc;
|
||||
rc = fsfilt_ext3_read(file->f_dentry->d_inode, buf, size, offs);
|
||||
if (rc > 0)
|
||||
rc = 0;
|
||||
return rc;
|
||||
}
|
||||
|
||||
int fsfilt_ext3_write_handle(struct inode *inode, void *buf, int bufsize,
|
||||
loff_t *offs, handle_t *handle)
|
||||
{
|
||||
struct buffer_head *bh = NULL;
|
||||
loff_t old_size = i_size_read(inode), offset = *offs;
|
||||
loff_t new_size = i_size_read(inode);
|
||||
unsigned long block;
|
||||
int err = 0, blocksize = 1 << inode->i_blkbits, size, boffs;
|
||||
|
||||
while (bufsize > 0) {
|
||||
if (bh != NULL)
|
||||
brelse(bh);
|
||||
|
||||
block = offset >> inode->i_blkbits;
|
||||
boffs = offset & (blocksize - 1);
|
||||
size = min(blocksize - boffs, bufsize);
|
||||
bh = ext3_bread(handle, inode, block, 1, &err);
|
||||
if (!bh) {
|
||||
CERROR("can't read/create block: %d\n", err);
|
||||
break;
|
||||
}
|
||||
|
||||
err = ext3_journal_get_write_access(handle, bh);
|
||||
if (err) {
|
||||
CERROR("journal_get_write_access() returned error %d\n",
|
||||
err);
|
||||
break;
|
||||
}
|
||||
LASSERT(bh->b_data + boffs + size <= bh->b_data + bh->b_size);
|
||||
memcpy(bh->b_data + boffs, buf, size);
|
||||
err = ext3_journal_dirty_metadata(handle, bh);
|
||||
if (err) {
|
||||
CERROR("journal_dirty_metadata() returned error %d\n",
|
||||
err);
|
||||
break;
|
||||
}
|
||||
if (offset + size > new_size)
|
||||
new_size = offset + size;
|
||||
offset += size;
|
||||
bufsize -= size;
|
||||
buf += size;
|
||||
}
|
||||
if (bh)
|
||||
brelse(bh);
|
||||
|
||||
/* correct in-core and on-disk sizes */
|
||||
if (new_size > i_size_read(inode)) {
|
||||
spin_lock(&inode->i_lock);
|
||||
if (new_size > i_size_read(inode))
|
||||
i_size_write(inode, new_size);
|
||||
if (i_size_read(inode) > EXT3_I(inode)->i_disksize)
|
||||
EXT3_I(inode)->i_disksize = i_size_read(inode);
|
||||
if (i_size_read(inode) > old_size) {
|
||||
spin_unlock(&inode->i_lock);
|
||||
mark_inode_dirty(inode);
|
||||
} else {
|
||||
spin_unlock(&inode->i_lock);
|
||||
}
|
||||
}
|
||||
|
||||
if (err == 0)
|
||||
*offs = offset;
|
||||
return err;
|
||||
}
|
||||
EXPORT_SYMBOL(fsfilt_ext3_write_handle);
|
||||
|
||||
static int fsfilt_ext3_write_record(struct file *file, void *buf, int bufsize,
|
||||
loff_t *offs, int force_sync)
|
||||
{
|
||||
struct inode *inode = file->f_dentry->d_inode;
|
||||
handle_t *handle;
|
||||
int err, block_count = 0, blocksize;
|
||||
|
||||
/* Determine how many transaction credits are needed */
|
||||
blocksize = 1 << inode->i_blkbits;
|
||||
block_count = (*offs & (blocksize - 1)) + bufsize;
|
||||
block_count = (block_count + blocksize - 1) >> inode->i_blkbits;
|
||||
|
||||
handle = ext3_journal_start(inode,
|
||||
block_count * EXT3_DATA_TRANS_BLOCKS(inode->i_sb) + 2);
|
||||
if (IS_ERR(handle)) {
|
||||
CERROR("can't start transaction for %d blocks (%d bytes)\n",
|
||||
block_count * EXT3_DATA_TRANS_BLOCKS(inode->i_sb) + 2,
|
||||
bufsize);
|
||||
return PTR_ERR(handle);
|
||||
}
|
||||
|
||||
err = fsfilt_ext3_write_handle(inode, buf, bufsize, offs, handle);
|
||||
|
||||
if (!err && force_sync)
|
||||
handle->h_sync = 1; /* recovery likes this */
|
||||
|
||||
ext3_journal_stop(handle);
|
||||
|
||||
return err;
|
||||
}
|
||||
|
||||
static int fsfilt_ext3_setup(struct super_block *sb)
|
||||
{
|
||||
if (!EXT3_HAS_COMPAT_FEATURE(sb,
|
||||
EXT3_FEATURE_COMPAT_HAS_JOURNAL)) {
|
||||
CERROR("ext3 mounted without journal\n");
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
#ifdef S_PDIROPS
|
||||
CWARN("Enabling PDIROPS\n");
|
||||
set_opt(EXT3_SB(sb)->s_mount_opt, PDIROPS);
|
||||
sb->s_flags |= S_PDIROPS;
|
||||
#endif
|
||||
if (!EXT3_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_DIR_INDEX))
|
||||
CWARN("filesystem doesn't have dir_index feature enabled\n");
|
||||
return 0;
|
||||
}
|
||||
static struct fsfilt_operations fsfilt_ext3_ops = {
|
||||
.fs_type = "ext3",
|
||||
.fs_owner = THIS_MODULE,
|
||||
.fs_getlabel = fsfilt_ext3_get_label,
|
||||
.fs_start = fsfilt_ext3_start,
|
||||
.fs_commit = fsfilt_ext3_commit,
|
||||
.fs_map_inode_pages = fsfilt_ext3_map_inode_pages,
|
||||
.fs_write_record = fsfilt_ext3_write_record,
|
||||
.fs_read_record = fsfilt_ext3_read_record,
|
||||
.fs_setup = fsfilt_ext3_setup,
|
||||
};
|
||||
|
||||
static int __init fsfilt_ext3_init(void)
|
||||
{
|
||||
int rc;
|
||||
|
||||
fcb_cache = kmem_cache_create("fsfilt_ext3_fcb",
|
||||
sizeof(struct fsfilt_cb_data), 0, 0);
|
||||
if (!fcb_cache) {
|
||||
CERROR("error allocating fsfilt journal callback cache\n");
|
||||
GOTO(out, rc = -ENOMEM);
|
||||
}
|
||||
|
||||
rc = fsfilt_register_ops(&fsfilt_ext3_ops);
|
||||
|
||||
if (rc) {
|
||||
int err = kmem_cache_destroy(fcb_cache);
|
||||
LASSERTF(err == 0, "error destroying new cache: rc %d\n", err);
|
||||
}
|
||||
out:
|
||||
return rc;
|
||||
}
|
||||
|
||||
static void __exit fsfilt_ext3_exit(void)
|
||||
{
|
||||
int rc;
|
||||
|
||||
fsfilt_unregister_ops(&fsfilt_ext3_ops);
|
||||
rc = kmem_cache_destroy(fcb_cache);
|
||||
LASSERTF(rc == 0, "couldn't destroy fcb_cache slab\n");
|
||||
}
|
||||
|
||||
module_init(fsfilt_ext3_init);
|
||||
module_exit(fsfilt_ext3_exit);
|
||||
|
||||
MODULE_AUTHOR("Sun Microsystems, Inc. <http://www.lustre.org/>");
|
||||
MODULE_DESCRIPTION("Lustre ext3 Filesystem Helper v0.1");
|
||||
MODULE_LICENSE("GPL");
|
||||
Loading…
x
Reference in New Issue
Block a user