#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 */
-#ifdef HAVE_BLOCKS_FOR_TRUNCATE
-# include <ext4/truncate.h>
-#else
-static inline unsigned long ext4_blocks_for_truncate(struct inode *inode)
-{
- ext4_lblk_t needed;
-
- needed = inode->i_blocks >> (inode->i_sb->s_blocksize_bits - 9);
- if (needed < 2)
- needed = 2;
- if (needed > EXT4_MAX_TRANS_DATA)
- needed = EXT4_MAX_TRANS_DATA;
- return EXT4_DATA_TRANS_BLOCKS(inode->i_sb) + needed;
-}
-#endif
-
-/*
- * 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
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,
+ .fs_type = "ext3",
+ .fs_owner = THIS_MODULE,
+ .fs_map_inode_pages = fsfilt_ext3_map_inode_pages,
};
static int __init fsfilt_ext3_init(void)
{
- int rc;
-
- fcb_cache = kmem_cache_create("fsfilt_ext3_fcb",
- sizeof(struct fsfilt_cb_data),
- 0, 0, NULL);
- if (!fcb_cache) {
- CERROR("error allocating fsfilt journal callback cache\n");
- GOTO(out, rc = -ENOMEM);
- }
-
- rc = fsfilt_register_ops(&fsfilt_ext3_ops);
-
- if (rc)
- kmem_cache_destroy(fcb_cache);
-out:
- return rc;
+ return fsfilt_register_ops(&fsfilt_ext3_ops);
}
static void __exit fsfilt_ext3_exit(void)
{
fsfilt_unregister_ops(&fsfilt_ext3_ops);
- kmem_cache_destroy(fcb_cache);
}
module_init(fsfilt_ext3_init);
git://git.whamcloud.com / fs / lustre-release.git / blobdiff