1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
2 * vim:expandtab:shiftwidth=8:tabstop=8:
4 * lustre/lib/fsfilt_ext3.c
5 * Lustre filesystem abstraction routines
7 * Copyright (C) 2002, 2003 Cluster File Systems, Inc.
8 * Author: Andreas Dilger <adilger@clusterfs.com>
10 * This file is part of Lustre, http://www.lustre.org.
12 * Lustre is free software; you can redistribute it and/or
13 * modify it under the terms of version 2 of the GNU General Public
14 * License as published by the Free Software Foundation.
16 * Lustre is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
21 * You should have received a copy of the GNU General Public License
22 * along with Lustre; if not, write to the Free Software
23 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
26 #define DEBUG_SUBSYSTEM S_FILTER
28 #include <linux/init.h>
29 #include <linux/module.h>
31 #include <linux/jbd.h>
32 #include <linux/slab.h>
33 #include <linux/pagemap.h>
34 #include <linux/quotaops.h>
35 #include <linux/ext3_fs.h>
36 #include <linux/ext3_jbd.h>
37 #include <linux/ext3_extents.h>
38 #include <linux/version.h>
39 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
40 #include <linux/ext3_xattr.h>
42 #include <ext3/xattr.h>
45 #include <libcfs/kp30.h>
46 #include <linux/lustre_fsfilt.h>
47 #include <linux/obd.h>
48 #include <linux/obd_class.h>
49 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
50 #include <linux/module.h>
51 #include <linux/iobuf.h>
55 static kmem_cache_t *fcb_cache;
56 static atomic_t fcb_cache_count = ATOMIC_INIT(0);
58 struct fsfilt_cb_data {
59 struct journal_callback cb_jcb; /* jbd private data - MUST BE FIRST */
60 fsfilt_cb_t cb_func; /* MDS/OBD completion function */
61 struct obd_device *cb_obd; /* MDS/OBD completion device */
62 __u64 cb_last_num; /* MDS/OST last committed operation */
63 void *cb_data; /* MDS/OST completion function data */
66 #ifndef EXT3_XATTR_INDEX_TRUSTED /* temporary until we hit l28 kernel */
67 #define EXT3_XATTR_INDEX_TRUSTED 4
70 #define XATTR_LUSTRE_MDS_LOV_EA "lov"
71 #define XATTR_LUSTRE_MDS_MID_EA "mid"
72 #define XATTR_LUSTRE_MDS_SID_EA "sid"
75 * We don't currently need any additional blocks for rmdir and
76 * unlink transactions because we are storing the OST oa_id inside
77 * the inode (which we will be changing anyways as part of this
80 static void *fsfilt_ext3_start(struct inode *inode, int op, void *desc_private,
83 /* For updates to the last recieved file */
84 int nblocks = EXT3_SINGLEDATA_TRANS_BLOCKS;
88 if (current->journal_info) {
89 CDEBUG(D_INODE, "increasing refcount on %p\n",
90 current->journal_info);
94 /* XXX BUG 3188 -- must return to one set of opcodes */
95 /* FIXME - cache hook */
97 nblocks += EXT3_INDEX_EXTRA_TRANS_BLOCKS+EXT3_DATA_TRANS_BLOCKS;
103 nblocks += EXT3_INDEX_EXTRA_TRANS_BLOCKS+EXT3_DATA_TRANS_BLOCKS;
108 case FSFILT_OP_RMDIR:
109 case FSFILT_OP_UNLINK:
110 /* delete one file + create/update logs for each stripe */
111 nblocks += EXT3_DELETE_TRANS_BLOCKS;
112 nblocks += (EXT3_INDEX_EXTRA_TRANS_BLOCKS +
113 EXT3_SINGLEDATA_TRANS_BLOCKS) * logs;
115 case FSFILT_OP_RENAME:
116 /* modify additional directory */
117 nblocks += EXT3_SINGLEDATA_TRANS_BLOCKS;
119 case FSFILT_OP_SYMLINK:
120 /* additional block + block bitmap + GDT for long symlink */
123 case FSFILT_OP_CREATE:
124 /* create/update logs for each stripe */
125 nblocks += (EXT3_INDEX_EXTRA_TRANS_BLOCKS +
126 EXT3_SINGLEDATA_TRANS_BLOCKS) * logs;
128 case FSFILT_OP_MKDIR:
129 case FSFILT_OP_MKNOD:
130 /* modify one inode + block bitmap + GDT */
134 /* modify parent directory */
135 nblocks += EXT3_INDEX_EXTRA_TRANS_BLOCKS +
136 EXT3_DATA_TRANS_BLOCKS;
138 case FSFILT_OP_SETATTR:
139 /* Setattr on inode */
142 case FSFILT_OP_CANCEL_UNLINK:
143 /* blocks for log header bitmap update OR
144 * blocks for catalog header bitmap update + unlink of logs */
145 nblocks = (LLOG_CHUNK_SIZE >> inode->i_blkbits) +
146 EXT3_DELETE_TRANS_BLOCKS * logs;
149 nblocks += EXT3_INDEX_EXTRA_TRANS_BLOCKS+EXT3_DATA_TRANS_BLOCKS;
151 default: CERROR("unknown transaction start op %d\n", op);
155 LASSERT(current->journal_info == desc_private);
156 journal = EXT3_SB(inode->i_sb)->s_journal;
157 if (nblocks > journal->j_max_transaction_buffers) {
158 CERROR("too many credits %d for op %ux%u using %d instead\n",
159 nblocks, op, logs, journal->j_max_transaction_buffers);
160 nblocks = journal->j_max_transaction_buffers;
165 handle = journal_start(EXT3_JOURNAL(inode), nblocks);
169 LASSERT(current->journal_info == handle);
171 CERROR("error starting handle for op %u (%u credits): rc %ld\n",
172 op, nblocks, PTR_ERR(handle));
177 * Calculate the number of buffer credits needed to write multiple pages in
178 * a single ext3 transaction. No, this shouldn't be here, but as yet ext3
179 * doesn't have a nice API for calculating this sort of thing in advance.
181 * See comment above ext3_writepage_trans_blocks for details. We assume
182 * no data journaling is being done, but it does allow for all of the pages
183 * being non-contiguous. If we are guaranteed contiguous pages we could
184 * reduce the number of (d)indirect blocks a lot.
186 * With N blocks per page and P pages, for each inode we have at most:
188 * min(N*P, blocksize/4 + 1) dindirect blocks
191 * For the entire filesystem, we have at most:
192 * min(sum(nindir + P), ngroups) bitmap blocks (from the above)
193 * min(sum(nindir + P), gdblocks) group descriptor blocks (from the above)
194 * objcount inode blocks
196 * 2 * EXT3_SINGLEDATA_TRANS_BLOCKS for the quota files
198 * 1 EXT3_DATA_TRANS_BLOCKS for the last_rcvd update.
200 static int fsfilt_ext3_credits_needed(int objcount, struct fsfilt_objinfo *fso,
201 int niocount, struct niobuf_local *nb)
203 struct super_block *sb = fso->fso_dentry->d_inode->i_sb;
205 const int blockpp = 1 << (PAGE_CACHE_SHIFT - sb->s_blocksize_bits);
206 int nbitmaps = 0, ngdblocks;
207 int needed = objcount + 1; /* inodes + superblock */
210 for (i = 0, j = 0; i < objcount; i++, fso++) {
211 /* two or more dindirect blocks in case we cross boundary */
212 int ndind = (long)((nb[j + fso->fso_bufcnt - 1].offset -
214 sb->s_blocksize_bits) /
215 (EXT3_ADDR_PER_BLOCK(sb) * EXT3_ADDR_PER_BLOCK(sb));
216 nbitmaps += min(fso->fso_bufcnt, ndind > 0 ? ndind : 2);
218 /* leaf, indirect, tindirect blocks for first block */
219 nbitmaps += blockpp + 2;
221 j += fso->fso_bufcnt;
224 next_indir = nb[0].offset +
225 (EXT3_ADDR_PER_BLOCK(sb) << sb->s_blocksize_bits);
226 for (i = 1; i < niocount; i++) {
227 if (nb[i].offset >= next_indir) {
228 nbitmaps++; /* additional indirect */
229 next_indir = nb[i].offset +
230 (EXT3_ADDR_PER_BLOCK(sb)<<sb->s_blocksize_bits);
231 } else if (nb[i].offset != nb[i - 1].offset + sb->s_blocksize) {
232 nbitmaps++; /* additional indirect */
234 nbitmaps += blockpp; /* each leaf in different group? */
237 ngdblocks = nbitmaps;
238 if (nbitmaps > EXT3_SB(sb)->s_groups_count)
239 nbitmaps = EXT3_SB(sb)->s_groups_count;
240 if (ngdblocks > EXT3_SB(sb)->s_gdb_count)
241 ngdblocks = EXT3_SB(sb)->s_gdb_count;
243 needed += nbitmaps + ngdblocks;
245 /* last_rcvd update */
246 needed += EXT3_DATA_TRANS_BLOCKS;
248 #if defined(CONFIG_QUOTA) && !defined(__x86_64__) /* XXX */
249 /* We assume that there will be 1 bit set in s_dquot.flags for each
250 * quota file that is active. This is at least true for now.
252 needed += hweight32(sb_any_quota_enabled(sb)) *
253 EXT3_SINGLEDATA_TRANS_BLOCKS;
259 /* We have to start a huge journal transaction here to hold all of the
260 * metadata for the pages being written here. This is necessitated by
261 * the fact that we do lots of prepare_write operations before we do
262 * any of the matching commit_write operations, so even if we split
263 * up to use "smaller" transactions none of them could complete until
264 * all of them were opened. By having a single journal transaction,
265 * we eliminate duplicate reservations for common blocks like the
266 * superblock and group descriptors or bitmaps.
268 * We will start the transaction here, but each prepare_write will
269 * add a refcount to the transaction, and each commit_write will
270 * remove a refcount. The transaction will be closed when all of
271 * the pages have been written.
273 static void *fsfilt_ext3_brw_start(int objcount, struct fsfilt_objinfo *fso,
274 int niocount, struct niobuf_local *nb,
275 void *desc_private, int logs)
282 LASSERT(current->journal_info == desc_private);
283 journal = EXT3_SB(fso->fso_dentry->d_inode->i_sb)->s_journal;
284 needed = fsfilt_ext3_credits_needed(objcount, fso, niocount, nb);
286 /* The number of blocks we could _possibly_ dirty can very large.
287 * We reduce our request if it is absurd (and we couldn't get that
288 * many credits for a single handle anyways).
290 * At some point we have to limit the size of I/Os sent at one time,
291 * increase the size of the journal, or we have to calculate the
292 * actual journal requirements more carefully by checking all of
293 * the blocks instead of being maximally pessimistic. It remains to
294 * be seen if this is a real problem or not.
296 if (needed > journal->j_max_transaction_buffers) {
297 CERROR("want too many journal credits (%d) using %d instead\n",
298 needed, journal->j_max_transaction_buffers);
299 needed = journal->j_max_transaction_buffers;
303 handle = journal_start(journal, needed);
305 if (IS_ERR(handle)) {
306 CERROR("can't get handle for %d credits: rc = %ld\n", needed,
309 LASSERT(handle->h_buffer_credits >= needed);
310 LASSERT(current->journal_info == handle);
316 static int fsfilt_ext3_commit(struct super_block *sb, struct inode *inode,
317 void *h, int force_sync)
320 handle_t *handle = h;
322 LASSERT(current->journal_info == handle);
324 handle->h_sync = 1; /* recovery likes this */
327 rc = journal_stop(handle);
333 static int fsfilt_ext3_commit_async(struct inode *inode, void *h,
337 transaction_t *transaction;
338 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0)
341 handle_t *handle = h;
345 LASSERT(current->journal_info == handle);
348 transaction = handle->h_transaction;
349 journal = transaction->t_journal;
350 tid = transaction->t_tid;
351 /* we don't want to be blocked */
353 rc = journal_stop(handle);
355 CERROR("error while stopping transaction: %d\n", rc);
359 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0)
360 rtid = log_start_commit(journal, transaction);
362 CERROR("strange race: %lu != %lu\n",
363 (unsigned long) tid, (unsigned long) rtid);
365 log_start_commit(journal, transaction->t_tid);
369 *wait_handle = (void *) tid;
370 CDEBUG(D_INODE, "commit async: %lu\n", (unsigned long) tid);
374 static int fsfilt_ext3_commit_wait(struct inode *inode, void *h)
376 tid_t tid = (tid_t)(long)h;
378 CDEBUG(D_INODE, "commit wait: %lu\n", (unsigned long) tid);
379 if (is_journal_aborted(EXT3_JOURNAL(inode)))
382 log_wait_commit(EXT3_JOURNAL(inode), tid);
387 static int fsfilt_ext3_setattr(struct dentry *dentry, void *handle,
388 struct iattr *iattr, int do_trunc)
390 struct inode *inode = dentry->d_inode;
395 /* A _really_ horrible hack to avoid removing the data stored
396 * in the block pointers; this is really the "small" stripe MD data.
397 * We can avoid further hackery by virtue of the MDS file size being
398 * zero all the time (which doesn't invoke block truncate at unlink
399 * time), so we assert we never change the MDS file size from zero. */
400 if (iattr->ia_valid & ATTR_SIZE && !do_trunc) {
401 /* ATTR_SIZE would invoke truncate: clear it */
402 iattr->ia_valid &= ~ATTR_SIZE;
403 EXT3_I(inode)->i_disksize = inode->i_size = iattr->ia_size;
405 /* make sure _something_ gets set - so new inode
406 * goes to disk (probably won't work over XFS */
407 if (!(iattr->ia_valid & (ATTR_MODE | ATTR_MTIME | ATTR_CTIME))){
408 iattr->ia_valid |= ATTR_MODE;
409 iattr->ia_mode = inode->i_mode;
413 /* Don't allow setattr to change file type */
414 iattr->ia_mode = (inode->i_mode & S_IFMT)|(iattr->ia_mode & ~S_IFMT);
416 /* We set these flags on the client, but have already checked perms
417 * so don't confuse inode_change_ok. */
418 iattr->ia_valid &= ~(ATTR_MTIME_SET | ATTR_ATIME_SET);
420 if (inode->i_op->setattr) {
421 rc = inode->i_op->setattr(dentry, iattr);
423 rc = inode_change_ok(inode, iattr);
425 rc = inode_setattr(inode, iattr);
433 static int fsfilt_ext3_iocontrol(struct inode * inode, struct file *file,
434 unsigned int cmd, unsigned long arg)
439 if (inode->i_fop->ioctl)
440 rc = inode->i_fop->ioctl(inode, file, cmd, arg);
447 static int fsfilt_ext3_set_xattr(struct inode * inode, void *handle, char *name,
448 void *buffer, int buffer_size)
454 rc = ext3_xattr_set_handle(handle, inode, EXT3_XATTR_INDEX_TRUSTED,
455 name, buffer, buffer_size, 0);
458 CERROR("set xattr %s from inode %lu: rc %d\n",
459 name, inode->i_ino, rc);
463 static int fsfilt_ext3_get_xattr(struct inode *inode, char *name,
464 void *buffer, int buffer_size)
470 rc = ext3_xattr_get(inode, EXT3_XATTR_INDEX_TRUSTED,
471 name, buffer, buffer_size);
475 return (rc == -ENODATA) ? 0 : rc;
477 CDEBUG(D_INFO, "error getting EA %s from inode %lu: rc %d\n",
478 name, inode->i_ino, rc);
479 memset(buffer, 0, buffer_size);
480 return (rc == -ENODATA) ? 0 : rc;
486 static int fsfilt_ext3_set_md(struct inode *inode, void *handle,
487 void *lmm, int lmm_size)
491 LASSERT(down_trylock(&inode->i_sem) != 0);
493 /* keep this when we get rid of OLD_EA (too noisy during conversion) */
494 if (EXT3_I(inode)->i_file_acl /* || large inode EA flag */)
495 CWARN("setting EA on %lu/%u again... interesting\n",
496 inode->i_ino, inode->i_generation);
498 rc = fsfilt_ext3_set_xattr(inode, handle, XATTR_LUSTRE_MDS_LOV_EA,
503 /* Must be called with i_sem held */
504 static int fsfilt_ext3_get_md(struct inode *inode, void *lmm, int lmm_size)
508 rc = fsfilt_ext3_get_xattr(inode, XATTR_LUSTRE_MDS_LOV_EA,
513 static int fsfilt_ext3_set_mid(struct inode *inode, void *handle,
514 void *mid, int mid_size)
518 rc = fsfilt_ext3_set_xattr(inode, handle, XATTR_LUSTRE_MDS_MID_EA,
523 /* Must be called with i_sem held */
524 static int fsfilt_ext3_get_mid(struct inode *inode, void *mid, int mid_size)
528 rc = fsfilt_ext3_get_xattr(inode, XATTR_LUSTRE_MDS_MID_EA,
533 static int fsfilt_ext3_set_sid(struct inode *inode, void *handle,
534 void *sid, int sid_size)
538 rc = fsfilt_ext3_set_xattr(inode, handle, XATTR_LUSTRE_MDS_SID_EA,
543 /* Must be called with i_sem held */
544 static int fsfilt_ext3_get_sid(struct inode *inode, void *sid, int sid_size)
548 rc = fsfilt_ext3_get_xattr(inode, XATTR_LUSTRE_MDS_SID_EA,
553 static int fsfilt_ext3_send_bio(int rw, struct inode *inode, void *bio)
556 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
557 submit_bio(rw, (struct bio *)bio);
559 struct bio *b = (struct kiobuf *)bio;
562 rc = brw_kiovec(rw, 1, &b, inode->i_dev,
563 b->blocks, 1 << inode->i_blkbits);
565 blocks_per_page = PAGE_SIZE >> inode->i_blkbits;
567 if (rc != (1 << inode->i_blkbits) * b->nr_pages * blocks_per_page) {
568 CERROR("short write? expected %d, wrote %d\n",
569 (1 << inode->i_blkbits) * b->nr_pages *
570 blocks_per_page, rc);
576 static struct page *fsfilt_ext3_getpage(struct inode *inode, long int index)
581 page = grab_cache_page(inode->i_mapping, index);
583 return ERR_PTR(-ENOMEM);
585 if (PageUptodate(page)) {
590 rc = inode->i_mapping->a_ops->readpage(NULL, page);
592 page_cache_release(page);
599 static ssize_t fsfilt_ext3_readpage(struct file *file, char *buf, size_t count,
602 struct inode *inode = file->f_dentry->d_inode;
605 if (S_ISREG(inode->i_mode))
606 rc = file->f_op->read(file, buf, count, off);
608 const int blkbits = inode->i_sb->s_blocksize_bits;
609 const int blksize = inode->i_sb->s_blocksize;
611 CDEBUG(D_EXT2, "reading "LPSZ" at dir %lu+%llu\n",
612 count, inode->i_ino, *off);
614 struct buffer_head *bh;
617 if (*off < inode->i_size) {
620 bh = ext3_bread(NULL, inode, *off >> blkbits,
623 CDEBUG(D_EXT2, "read %u@%llu\n", blksize, *off);
626 memcpy(buf, bh->b_data, blksize);
629 /* XXX in theory we should just fake
630 * this buffer and continue like ext3,
631 * especially if this is a partial read
633 CERROR("error read dir %lu+%llu: %d\n",
634 inode->i_ino, *off, err);
639 struct ext3_dir_entry_2 *fake = (void *)buf;
641 CDEBUG(D_EXT2, "fake %u@%llu\n", blksize, *off);
642 memset(fake, 0, sizeof(*fake));
643 fake->rec_len = cpu_to_le32(blksize);
655 static void fsfilt_ext3_cb_func(struct journal_callback *jcb, int error)
657 struct fsfilt_cb_data *fcb = (struct fsfilt_cb_data *)jcb;
659 fcb->cb_func(fcb->cb_obd, fcb->cb_last_num, fcb->cb_data, error);
661 OBD_SLAB_FREE(fcb, fcb_cache, sizeof *fcb);
662 atomic_dec(&fcb_cache_count);
665 static int fsfilt_ext3_add_journal_cb(struct obd_device *obd,
666 struct super_block *sb,
667 __u64 last_num, void *handle,
671 struct fsfilt_cb_data *fcb;
673 OBD_SLAB_ALLOC(fcb, fcb_cache, GFP_NOFS, sizeof *fcb);
677 atomic_inc(&fcb_cache_count);
678 fcb->cb_func = cb_func;
680 fcb->cb_last_num = last_num;
681 fcb->cb_data = cb_data;
683 CDEBUG(D_EXT2, "set callback for last_num: "LPD64"\n", last_num);
686 journal_callback_set(handle, fsfilt_ext3_cb_func,
687 (struct journal_callback *)fcb);
694 * We need to hack the return value for the free inode counts because
695 * the current EA code requires one filesystem block per inode with EAs,
696 * so it is possible to run out of blocks before we run out of inodes.
698 * This can be removed when the ext3 EA code is fixed.
700 static int fsfilt_ext3_statfs(struct super_block *sb, struct obd_statfs *osfs)
705 memset(&sfs, 0, sizeof(sfs));
707 rc = sb->s_op->statfs(sb, &sfs);
709 if (!rc && sfs.f_bfree < sfs.f_ffree) {
710 sfs.f_files = (sfs.f_files - sfs.f_ffree) + sfs.f_bfree;
711 sfs.f_ffree = sfs.f_bfree;
714 statfs_pack(osfs, &sfs);
718 static int fsfilt_ext3_sync(struct super_block *sb)
720 return ext3_force_commit(sb);
723 #ifdef EXT3_MULTIBLOCK_ALLOCATOR
724 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
725 #define ext3_up_truncate_sem(inode) up_write(&EXT3_I(inode)->truncate_sem);
726 #define ext3_down_truncate_sem(inode) down_write(&EXT3_I(inode)->truncate_sem);
728 #define ext3_up_truncate_sem(inode) up(&EXT3_I(inode)->truncate_sem);
729 #define ext3_down_truncate_sem(inode) down(&EXT3_I(inode)->truncate_sem);
732 #include <linux/lustre_version.h>
733 #if EXT3_EXT_MAGIC == 0xf301
734 #define ee_start e_start
735 #define ee_block e_block
738 #ifndef EXT3_BB_MAX_BLOCKS
739 #define ext3_mb_new_blocks(handle, inode, goal, count, aflags, err) \
740 ext3_new_blocks(handle, inode, count, goal, err)
744 unsigned long *blocks;
751 static int ext3_ext_find_goal(struct inode *inode, struct ext3_ext_path *path,
752 unsigned long block, int *aflags)
754 struct ext3_inode_info *ei = EXT3_I(inode);
755 unsigned long bg_start;
756 unsigned long colour;
760 struct ext3_extent *ex;
761 depth = path->p_depth;
763 /* try to predict block placement */
764 if ((ex = path[depth].p_ext)) {
765 if (ex->ee_block + ex->ee_len == block)
767 return ex->ee_start + (block - ex->ee_block);
770 /* it looks index is empty
771 * try to find starting from index itself */
772 if (path[depth].p_bh)
773 return path[depth].p_bh->b_blocknr;
776 /* OK. use inode's group */
777 bg_start = (ei->i_block_group * EXT3_BLOCKS_PER_GROUP(inode->i_sb)) +
778 le32_to_cpu(EXT3_SB(inode->i_sb)->s_es->s_first_data_block);
779 colour = (current->pid % 16) *
780 (EXT3_BLOCKS_PER_GROUP(inode->i_sb) / 16);
781 return bg_start + colour + block;
784 static int ext3_ext_new_extent_cb(struct ext3_extents_tree *tree,
785 struct ext3_ext_path *path,
786 struct ext3_extent *newex, int exist)
788 struct inode *inode = tree->inode;
789 struct bpointers *bp = tree->private;
790 int count, err, goal;
791 unsigned long pblock;
798 EXT_ASSERT(i == path->p_depth);
799 EXT_ASSERT(path[i].p_hdr);
806 if (bp->create == 0) {
808 if (newex->ee_block < bp->start)
809 i = bp->start - newex->ee_block;
810 if (i >= newex->ee_len)
811 CERROR("nothing to do?! i = %d, e_num = %u\n",
813 for (; i < newex->ee_len && bp->num; i++) {
824 tgen = EXT_GENERATION(tree);
825 count = ext3_ext_calc_credits_for_insert(tree, path);
826 ext3_up_truncate_sem(inode);
829 handle = journal_start(EXT3_JOURNAL(inode), count + EXT3_ALLOC_NEEDED + 1);
831 if (IS_ERR(handle)) {
832 ext3_down_truncate_sem(inode);
833 return PTR_ERR(handle);
836 if (tgen != EXT_GENERATION(tree)) {
837 /* the tree has changed. so path can be invalid at moment */
839 journal_stop(handle);
841 ext3_down_truncate_sem(inode);
845 ext3_down_truncate_sem(inode);
846 count = newex->ee_len;
847 goal = ext3_ext_find_goal(inode, path, newex->ee_block, &aflags);
848 aflags |= 2; /* block have been already reserved */
849 pblock = ext3_mb_new_blocks(handle, inode, goal, &count, aflags, &err);
852 EXT_ASSERT(count <= newex->ee_len);
854 /* insert new extent */
855 newex->ee_start = pblock;
856 newex->ee_len = count;
857 err = ext3_ext_insert_extent(handle, tree, path, newex);
861 /* correct on-disk inode size */
862 if (newex->ee_len > 0) {
863 new_i_size = (loff_t) newex->ee_block + newex->ee_len;
864 new_i_size = new_i_size << inode->i_blkbits;
865 if (new_i_size > EXT3_I(inode)->i_disksize) {
866 EXT3_I(inode)->i_disksize = new_i_size;
867 err = ext3_mark_inode_dirty(handle, inode);
872 journal_stop(handle);
878 CERROR("hmm. why do we find this extent?\n");
879 CERROR("initial space: %lu:%u\n",
880 bp->start, bp->init_num);
881 CERROR("current extent: %u/%u/%u %d\n",
882 newex->ee_block, newex->ee_len,
883 newex->ee_start, exist);
886 if (newex->ee_block < bp->start)
887 i = bp->start - newex->ee_block;
888 if (i >= newex->ee_len)
889 CERROR("nothing to do?! i = %d, e_num = %u\n",
891 for (; i < newex->ee_len && bp->num; i++) {
892 *(bp->created) = (exist == 0 ? 1 : 0);
894 *(bp->blocks) = newex->ee_start + i;
903 int fsfilt_map_nblocks(struct inode *inode, unsigned long block,
904 unsigned long num, unsigned long *blocks,
905 int *created, int create)
907 struct ext3_extents_tree tree;
911 CDEBUG(D_OTHER, "blocks %lu-%lu requested for inode %u\n",
912 block, block + num, (unsigned) inode->i_ino);
914 ext3_init_tree_desc(&tree, inode);
917 bp.created = created;
919 bp.init_num = bp.num = num;
922 ext3_down_truncate_sem(inode);
923 err = ext3_ext_walk_space(&tree, block, num, ext3_ext_new_extent_cb);
924 ext3_ext_invalidate_cache(&tree);
925 ext3_up_truncate_sem(inode);
930 int fsfilt_ext3_map_ext_inode_pages(struct inode *inode, struct page **page,
931 int pages, unsigned long *blocks,
932 int *created, int create)
934 int blocks_per_page = PAGE_SIZE >> inode->i_blkbits;
936 struct page *fp = NULL;
939 CDEBUG(D_OTHER, "inode %lu: map %d pages from %lu\n",
940 inode->i_ino, pages, (*page)->index);
942 /* pages are sorted already. so, we just have to find
943 * contig. space and process them properly */
946 /* start new extent */
951 } else if (fp->index + clen == (*page)->index) {
952 /* continue the extent */
959 /* process found extent */
960 rc = fsfilt_map_nblocks(inode, fp->index * blocks_per_page,
961 clen * blocks_per_page, blocks,
966 /* look for next extent */
968 blocks += blocks_per_page * clen;
969 created += blocks_per_page * clen;
973 rc = fsfilt_map_nblocks(inode, fp->index * blocks_per_page,
974 clen * blocks_per_page, blocks,
981 extern int ext3_map_inode_page(struct inode *inode, struct page *page,
982 unsigned long *blocks, int *created, int create);
983 int fsfilt_ext3_map_bm_inode_pages(struct inode *inode, struct page **page,
984 int pages, unsigned long *blocks,
985 int *created, int create)
987 int blocks_per_page = PAGE_SIZE >> inode->i_blkbits;
991 for (i = 0, cr = created, b = blocks; i < pages; i++, page++) {
992 rc = ext3_map_inode_page(inode, *page, b, cr, create);
994 CERROR("ino %lu, blk %lu cr %u create %d: rc %d\n",
995 inode->i_ino, *b, *cr, create, rc);
999 b += blocks_per_page;
1000 cr += blocks_per_page;
1005 int fsfilt_ext3_map_inode_pages(struct inode *inode, struct page **page,
1006 int pages, unsigned long *blocks,
1007 int *created, int create,
1008 struct semaphore *optional_sem)
1011 #ifdef EXT3_MULTIBLOCK_ALLOCATOR
1012 if (EXT3_I(inode)->i_flags & EXT3_EXTENTS_FL) {
1013 rc = fsfilt_ext3_map_ext_inode_pages(inode, page, pages,
1014 blocks, created, create);
1018 if (optional_sem != NULL)
1020 rc = fsfilt_ext3_map_bm_inode_pages(inode, page, pages, blocks,
1022 if (optional_sem != NULL)
1028 extern int ext3_prep_san_write(struct inode *inode, long *blocks,
1029 int nblocks, loff_t newsize);
1030 static int fsfilt_ext3_prep_san_write(struct inode *inode, long *blocks,
1031 int nblocks, loff_t newsize)
1033 return ext3_prep_san_write(inode, blocks, nblocks, newsize);
1036 static int fsfilt_ext3_read_record(struct file * file, void *buf,
1037 int size, loff_t *offs)
1039 struct inode *inode = file->f_dentry->d_inode;
1040 unsigned long block;
1041 struct buffer_head *bh;
1042 int err, blocksize, csize, boffs;
1044 /* prevent reading after eof */
1046 if (inode->i_size < *offs + size) {
1047 size = inode->i_size - *offs;
1050 CERROR("size %llu is too short for read %u@%llu\n",
1051 inode->i_size, size, *offs);
1053 } else if (size == 0) {
1060 blocksize = 1 << inode->i_blkbits;
1063 block = *offs >> inode->i_blkbits;
1064 boffs = *offs & (blocksize - 1);
1065 csize = min(blocksize - boffs, size);
1066 bh = ext3_bread(NULL, inode, block, 0, &err);
1068 CERROR("can't read block: %d\n", err);
1072 memcpy(buf, bh->b_data + boffs, csize);
1082 static int fsfilt_ext3_write_record(struct file *file, void *buf, int bufsize,
1083 loff_t *offs, int force_sync)
1085 struct buffer_head *bh = NULL;
1086 unsigned long block;
1087 struct inode *inode = file->f_dentry->d_inode;
1088 loff_t old_size = inode->i_size, offset = *offs;
1089 loff_t new_size = inode->i_size;
1092 int err = 0, block_count = 0, blocksize, size, boffs;
1094 /* Determine how many transaction credits are needed */
1095 blocksize = 1 << inode->i_blkbits;
1096 block_count = (*offs & (blocksize - 1)) + bufsize;
1097 block_count = (block_count + blocksize - 1) >> inode->i_blkbits;
1099 journal = EXT3_SB(inode->i_sb)->s_journal;
1101 handle = journal_start(journal,
1102 block_count * EXT3_DATA_TRANS_BLOCKS + 2);
1104 if (IS_ERR(handle)) {
1105 CERROR("can't start transaction\n");
1106 return PTR_ERR(handle);
1109 while (bufsize > 0) {
1113 block = offset >> inode->i_blkbits;
1114 boffs = offset & (blocksize - 1);
1115 size = min(blocksize - boffs, bufsize);
1116 bh = ext3_bread(handle, inode, block, 1, &err);
1118 CERROR("can't read/create block: %d\n", err);
1122 err = ext3_journal_get_write_access(handle, bh);
1124 CERROR("journal_get_write_access() returned error %d\n",
1128 LASSERT(bh->b_data + boffs + size <= bh->b_data + bh->b_size);
1129 memcpy(bh->b_data + boffs, buf, size);
1130 err = ext3_journal_dirty_metadata(handle, bh);
1132 CERROR("journal_dirty_metadata() returned error %d\n",
1136 if (offset + size > new_size)
1137 new_size = offset + size;
1144 handle->h_sync = 1; /* recovery likes this */
1149 /* correct in-core and on-disk sizes */
1150 if (new_size > inode->i_size) {
1152 if (new_size > inode->i_size)
1153 inode->i_size = new_size;
1154 if (inode->i_size > EXT3_I(inode)->i_disksize)
1155 EXT3_I(inode)->i_disksize = inode->i_size;
1156 if (inode->i_size > old_size)
1157 mark_inode_dirty(inode);
1162 journal_stop(handle);
1170 static int fsfilt_ext3_setup(struct obd_device *obd, struct super_block *sb)
1172 #ifdef EXT3_FEATURE_INCOMPAT_MDSNUM
1173 struct mds_obd *mds = &obd->u.mds;
1176 EXT3_SB(sb)->dx_lock = fsfilt_ext3_dx_lock;
1177 EXT3_SB(sb)->dx_unlock = fsfilt_ext3_dx_unlock;
1180 CWARN("Enabling PDIROPS\n");
1181 set_opt(EXT3_SB(sb)->s_mount_opt, PDIROPS);
1182 sb->s_flags |= S_PDIROPS;
1184 /* setup mdsnum in underlying fs */
1185 #ifdef EXT3_FEATURE_INCOMPAT_MDSNUM
1186 if (mds->mds_md_obd) {
1187 struct ext3_sb_info *sbi = EXT3_SB(sb);
1188 struct ext3_super_block *es = sbi->s_es;
1192 if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_MDSNUM)) {
1193 CWARN("%s: set mdsnum %d in ext3\n",
1194 obd->obd_name, mds->mds_num);
1196 handle = journal_start(sbi->s_journal, 1);
1198 LASSERT(!IS_ERR(handle));
1199 err = ext3_journal_get_write_access(handle, sbi->s_sbh);
1201 EXT3_SET_INCOMPAT_FEATURE(sb,
1202 EXT3_FEATURE_INCOMPAT_MDSNUM);
1203 es->s_mdsnum = mds->mds_num;
1204 err = ext3_journal_dirty_metadata(handle, sbi->s_sbh);
1207 journal_stop(handle);
1210 CWARN("%s: mdsnum initialized to %u in ext3fs\n",
1211 obd->obd_name, es->s_mdsnum);
1213 sbi->s_mdsnum = es->s_mdsnum;
1219 extern int ext3_add_dir_entry(struct dentry *dentry);
1220 extern int ext3_del_dir_entry(struct dentry *dentry);
1222 static int fsfilt_ext3_add_dir_entry(struct obd_device *obd,
1223 struct dentry *parent,
1224 char *name, int namelen,
1226 unsigned long generation,
1230 #ifdef EXT3_FEATURE_INCOMPAT_MDSNUM
1231 struct dentry *dentry;
1234 LASSERT(namelen != 0);
1235 dentry = ll_lookup_one_len(name, parent, namelen);
1236 if (IS_ERR(dentry)) {
1237 CERROR("can't lookup %*s in %lu/%lu: %d\n", dentry->d_name.len,
1238 dentry->d_name.name, dentry->d_inode->i_ino,
1239 (unsigned long) dentry->d_inode->i_generation,
1240 (int) PTR_ERR(dentry));
1241 RETURN(PTR_ERR(dentry));
1243 if (dentry->d_inode != NULL || dentry->d_flags & DCACHE_CROSS_REF) {
1244 CERROR("dentry %*s(0x%p) found\n", dentry->d_name.len,
1245 dentry->d_name.name, dentry);
1250 /* mds_reint_rename() may use this method to add dir entry
1251 * that points onto local inode. and we don't want to find
1252 * it cross-ref by subsequent lookups */
1255 dentry->d_flags |= DCACHE_CROSS_REF;
1256 dentry->d_inum = ino;
1257 dentry->d_mdsnum = mds;
1258 dentry->d_generation = generation;
1259 dentry->d_fid = fid;
1261 err = ext3_add_dir_entry(dentry);
1268 #error "rebuild kernel and lustre with ext3-mds-num patch!"
1273 static int fsfilt_ext3_del_dir_entry(struct obd_device *obd,
1274 struct dentry *dentry)
1276 #ifdef EXT3_FEATURE_INCOMPAT_MDSNUM
1279 err = ext3_del_dir_entry(dentry);
1285 #error "rebuild kernel and lustre with ext3-mds-num patch!"
1290 /* If fso is NULL, op is FSFILT operation, otherwise op is number of fso
1291 objects. Logs is number of logfiles to update */
1292 static int fsfilt_ext3_get_op_len(int op, struct fsfilt_objinfo *fso, int logs)
1296 case FSFILT_OP_CREATE:
1297 /* directory leaf, index & indirect & EA*/
1298 return 4 + 3 * logs;
1299 case FSFILT_OP_UNLINK:
1305 struct super_block *sb = fso->fso_dentry->d_inode->i_sb;
1306 int blockpp = 1 << (PAGE_CACHE_SHIFT - sb->s_blocksize_bits);
1307 int addrpp = EXT3_ADDR_PER_BLOCK(sb) * blockpp;
1308 for (i = 0; i < op; i++, fso++) {
1309 int nblocks = fso->fso_bufcnt * blockpp;
1310 int ndindirect = min(nblocks, addrpp + 1);
1311 int nindir = nblocks + ndindirect + 1;
1315 return needed + 3 * logs;
1322 #define EXTENTS_EA "write_extents"
1323 #define EXTENTS_EA_SIZE 64
1325 int ext3_ext_in_ea_alloc_space(struct inode *, int, const char *, unsigned long, unsigned long);
1326 int ext3_ext_in_ea_remove_space(struct inode *, int, const char *, unsigned long, unsigned long);
1327 int ext3_ext_in_ea_get_extents(struct inode *, int, const char *, char **, int *);
1328 int ext3_ext_in_ea_get_extents_num(struct inode *, int, const char *, int *);
1330 static int fsfilt_ext3_insert_extents_ea(struct inode *inode,
1336 rc = ext3_ext_in_ea_alloc_space(inode, EXT3_XATTR_INDEX_TRUSTED,
1337 EXTENTS_EA, from, num);
1341 static int fsfilt_ext3_remove_extents_ea(struct inode *inode,
1347 rc = ext3_ext_in_ea_remove_space(inode, EXT3_XATTR_INDEX_TRUSTED,
1348 EXTENTS_EA, from, num);
1352 extern int ext3_init_tree_in_ea(struct inode *inode, int name_index,
1353 const char *eaname, int size);
1355 static int fsfilt_ext3_init_extents_ea(struct inode *inode)
1359 rc = ext3_init_tree_in_ea(inode, EXT3_XATTR_INDEX_TRUSTED,
1364 static int fsfilt_ext3_get_inode_write_extents(struct inode *inode,
1365 char **pbuf, int *size)
1369 rc = ext3_ext_in_ea_get_extents(inode, EXT3_XATTR_INDEX_TRUSTED,
1370 EXTENTS_EA, pbuf, size);
1374 static int fsfilt_ext3_get_write_extents_num(struct inode *inode, int *size)
1378 rc = ext3_ext_in_ea_get_extents_num(inode, EXT3_XATTR_INDEX_TRUSTED,
1383 static struct fsfilt_operations fsfilt_ext3_ops = {
1385 .fs_owner = THIS_MODULE,
1386 .fs_start = fsfilt_ext3_start,
1387 .fs_brw_start = fsfilt_ext3_brw_start,
1388 .fs_commit = fsfilt_ext3_commit,
1389 .fs_commit_async = fsfilt_ext3_commit_async,
1390 .fs_commit_wait = fsfilt_ext3_commit_wait,
1391 .fs_setattr = fsfilt_ext3_setattr,
1392 .fs_iocontrol = fsfilt_ext3_iocontrol,
1393 .fs_set_md = fsfilt_ext3_set_md,
1394 .fs_get_md = fsfilt_ext3_get_md,
1395 .fs_set_mid = fsfilt_ext3_set_mid,
1396 .fs_get_mid = fsfilt_ext3_get_mid,
1397 .fs_set_sid = fsfilt_ext3_set_sid,
1398 .fs_get_sid = fsfilt_ext3_get_sid,
1399 .fs_readpage = fsfilt_ext3_readpage,
1400 .fs_add_journal_cb = fsfilt_ext3_add_journal_cb,
1401 .fs_statfs = fsfilt_ext3_statfs,
1402 .fs_sync = fsfilt_ext3_sync,
1403 .fs_map_inode_pages = fsfilt_ext3_map_inode_pages,
1404 .fs_prep_san_write = fsfilt_ext3_prep_san_write,
1405 .fs_write_record = fsfilt_ext3_write_record,
1406 .fs_read_record = fsfilt_ext3_read_record,
1407 .fs_setup = fsfilt_ext3_setup,
1408 .fs_getpage = fsfilt_ext3_getpage,
1409 .fs_send_bio = fsfilt_ext3_send_bio,
1410 .fs_set_xattr = fsfilt_ext3_set_xattr,
1411 .fs_get_xattr = fsfilt_ext3_get_xattr,
1412 .fs_get_op_len = fsfilt_ext3_get_op_len,
1413 .fs_add_dir_entry = fsfilt_ext3_add_dir_entry,
1414 .fs_del_dir_entry = fsfilt_ext3_del_dir_entry,
1415 .fs_init_extents_ea = fsfilt_ext3_init_extents_ea,
1416 .fs_insert_extents_ea = fsfilt_ext3_insert_extents_ea,
1417 .fs_remove_extents_ea = fsfilt_ext3_remove_extents_ea,
1418 .fs_get_inode_write_extents = fsfilt_ext3_get_inode_write_extents,
1419 .fs_get_write_extents_num = fsfilt_ext3_get_write_extents_num,
1422 static int __init fsfilt_ext3_init(void)
1426 fcb_cache = kmem_cache_create("fsfilt_ext3_fcb",
1427 sizeof(struct fsfilt_cb_data), 0,
1430 CERROR("error allocating fsfilt journal callback cache\n");
1431 GOTO(out, rc = -ENOMEM);
1434 rc = fsfilt_register_ops(&fsfilt_ext3_ops);
1437 kmem_cache_destroy(fcb_cache);
1442 static void __exit fsfilt_ext3_exit(void)
1444 fsfilt_unregister_ops(&fsfilt_ext3_ops);
1445 LASSERTF(kmem_cache_destroy(fcb_cache) == 0,
1446 "can't free fsfilt callback cache: count %d\n",
1447 atomic_read(&fcb_cache_count));
1450 module_init(fsfilt_ext3_init);
1451 module_exit(fsfilt_ext3_exit);
1453 MODULE_AUTHOR("Cluster File Systems, Inc. <info@clusterfs.com>");
1454 MODULE_DESCRIPTION("Lustre ext3 Filesystem Helper v0.1");
1455 MODULE_LICENSE("GPL");