diff options
Diffstat (limited to 'drivers/staging/lustre/lustre/lvfs/fsfilt_ext3.c')
| -rw-r--r-- | drivers/staging/lustre/lustre/lvfs/fsfilt_ext3.c | 761 |
1 files changed, 761 insertions, 0 deletions
diff --git a/drivers/staging/lustre/lustre/lvfs/fsfilt_ext3.c b/drivers/staging/lustre/lustre/lvfs/fsfilt_ext3.c new file mode 100644 index 000000000000..c1e99b37572e --- /dev/null +++ b/drivers/staging/lustre/lustre/lvfs/fsfilt_ext3.c @@ -0,0 +1,761 @@ +/* + * 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/version.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"); |