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/version.h>
39 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
40 #include <linux/ext3_xattr.h>
42 #include <linux/../../fs/ext3/xattr.h>
44 #include <linux/kp30.h>
45 #include <linux/lustre_fsfilt.h>
46 #include <linux/obd.h>
47 #include <linux/obd_class.h>
49 static kmem_cache_t *fcb_cache;
50 static atomic_t fcb_cache_count = ATOMIC_INIT(0);
52 struct fsfilt_cb_data {
53 struct journal_callback cb_jcb; /* jbd private data - MUST BE FIRST */
54 fsfilt_cb_t cb_func; /* MDS/OBD completion function */
55 struct obd_device *cb_obd; /* MDS/OBD completion device */
56 __u64 cb_last_rcvd; /* MDS/OST last committed operation */
57 void *cb_data; /* MDS/OST completion function data */
60 #ifndef EXT3_XATTR_INDEX_TRUSTED /* temporary until we hit l28 kernel */
61 #define EXT3_XATTR_INDEX_TRUSTED 4
63 #define XATTR_LUSTRE_MDS_LOV_EA "lov"
65 #define EXT3_XATTR_INDEX_LUSTRE 5 /* old */
66 #define XATTR_LUSTRE_MDS_OBJID "system.lustre_mds_objid" /* old */
69 * We don't currently need any additional blocks for rmdir and
70 * unlink transactions because we are storing the OST oa_id inside
71 * the inode (which we will be changing anyways as part of this
74 static void *fsfilt_ext3_start(struct inode *inode, int op, void *desc_private,
77 /* For updates to the last recieved file */
78 int nblocks = EXT3_SINGLEDATA_TRANS_BLOCKS;
82 if (current->journal_info) {
83 CDEBUG(D_INODE, "increasing refcount on %p\n",
84 current->journal_info);
90 case FSFILT_OP_UNLINK:
91 /* delete one file + create/update logs for each stripe */
92 nblocks += EXT3_DELETE_TRANS_BLOCKS;
93 nblocks += (EXT3_INDEX_EXTRA_TRANS_BLOCKS +
94 EXT3_SINGLEDATA_TRANS_BLOCKS) * logs;
96 case FSFILT_OP_RENAME:
97 /* modify additional directory */
98 nblocks += EXT3_SINGLEDATA_TRANS_BLOCKS;
100 case FSFILT_OP_SYMLINK:
101 /* additional block + block bitmap + GDT for long symlink */
104 case FSFILT_OP_CREATE:
105 /* create/update logs for each stripe */
106 nblocks += (EXT3_INDEX_EXTRA_TRANS_BLOCKS +
107 EXT3_SINGLEDATA_TRANS_BLOCKS) * logs;
109 case FSFILT_OP_MKDIR:
110 case FSFILT_OP_MKNOD:
111 /* modify one inode + block bitmap + GDT */
115 /* modify parent directory */
116 nblocks += EXT3_INDEX_EXTRA_TRANS_BLOCKS +
117 EXT3_DATA_TRANS_BLOCKS;
119 case FSFILT_OP_SETATTR:
120 /* Setattr on inode */
123 case FSFILT_OP_CANCEL_UNLINK:
124 /* blocks for log header bitmap update OR
125 * blocks for catalog header bitmap update + unlink of logs */
126 nblocks = (LLOG_CHUNK_SIZE >> inode->i_blkbits) +
127 EXT3_DELETE_TRANS_BLOCKS * logs;
129 default: CERROR("unknown transaction start op %d\n", op);
133 LASSERT(current->journal_info == desc_private);
134 journal = EXT3_SB(inode->i_sb)->s_journal;
135 if (nblocks > journal->j_max_transaction_buffers) {
136 CERROR("too many credits %d for op %ux%u using %d instead\n",
137 nblocks, op, logs, journal->j_max_transaction_buffers);
138 nblocks = journal->j_max_transaction_buffers;
143 handle = journal_start(EXT3_JOURNAL(inode), nblocks);
147 LASSERT(current->journal_info == handle);
149 CERROR("error starting handle for op %u (%u credits): rc %ld\n",
150 op, nblocks, PTR_ERR(handle));
155 * Calculate the number of buffer credits needed to write multiple pages in
156 * a single ext3 transaction. No, this shouldn't be here, but as yet ext3
157 * doesn't have a nice API for calculating this sort of thing in advance.
159 * See comment above ext3_writepage_trans_blocks for details. We assume
160 * no data journaling is being done, but it does allow for all of the pages
161 * being non-contiguous. If we are guaranteed contiguous pages we could
162 * reduce the number of (d)indirect blocks a lot.
164 * With N blocks per page and P pages, for each inode we have at most:
166 * min(N*P, blocksize/4 + 1) dindirect blocks
169 * For the entire filesystem, we have at most:
170 * min(sum(nindir + P), ngroups) bitmap blocks (from the above)
171 * min(sum(nindir + P), gdblocks) group descriptor blocks (from the above)
172 * objcount inode blocks
174 * 2 * EXT3_SINGLEDATA_TRANS_BLOCKS for the quota files
176 * 1 EXT3_DATA_TRANS_BLOCKS for the last_rcvd update.
178 static int fsfilt_ext3_credits_needed(int objcount, struct fsfilt_objinfo *fso,
179 int niocount, struct niobuf_local *nb)
181 struct super_block *sb = fso->fso_dentry->d_inode->i_sb;
183 const int blockpp = 1 << (PAGE_CACHE_SHIFT - sb->s_blocksize_bits);
184 int nbitmaps = 0, ngdblocks;
185 int needed = objcount + 1; /* inodes + superblock */
188 for (i = 0, j = 0; i < objcount; i++, fso++) {
189 /* two or more dindirect blocks in case we cross boundary */
190 int ndind = (long)((nb[j + fso->fso_bufcnt - 1].offset -
192 sb->s_blocksize_bits) /
193 (EXT3_ADDR_PER_BLOCK(sb) * EXT3_ADDR_PER_BLOCK(sb));
194 nbitmaps += min(fso->fso_bufcnt, ndind > 0 ? ndind : 2);
196 /* leaf, indirect, tindirect blocks for first block */
197 nbitmaps += blockpp + 2;
199 j += fso->fso_bufcnt;
202 next_indir = nb[0].offset +
203 (EXT3_ADDR_PER_BLOCK(sb) << sb->s_blocksize_bits);
204 for (i = 1; i < niocount; i++) {
205 if (nb[i].offset >= next_indir) {
206 nbitmaps++; /* additional indirect */
207 next_indir = nb[i].offset +
208 (EXT3_ADDR_PER_BLOCK(sb)<<sb->s_blocksize_bits);
209 } else if (nb[i].offset != nb[i - 1].offset + sb->s_blocksize) {
210 nbitmaps++; /* additional indirect */
212 nbitmaps += blockpp; /* each leaf in different group? */
215 ngdblocks = nbitmaps;
216 if (nbitmaps > EXT3_SB(sb)->s_groups_count)
217 nbitmaps = EXT3_SB(sb)->s_groups_count;
218 if (ngdblocks > EXT3_SB(sb)->s_gdb_count)
219 ngdblocks = EXT3_SB(sb)->s_gdb_count;
221 needed += nbitmaps + ngdblocks;
223 /* last_rcvd update */
224 needed += EXT3_DATA_TRANS_BLOCKS;
226 #if defined(CONFIG_QUOTA) && !defined(__x86_64__) /* XXX */
227 /* We assume that there will be 1 bit set in s_dquot.flags for each
228 * quota file that is active. This is at least true for now.
230 needed += hweight32(sb_any_quota_enabled(sb)) *
231 EXT3_SINGLEDATA_TRANS_BLOCKS;
237 /* We have to start a huge journal transaction here to hold all of the
238 * metadata for the pages being written here. This is necessitated by
239 * the fact that we do lots of prepare_write operations before we do
240 * any of the matching commit_write operations, so even if we split
241 * up to use "smaller" transactions none of them could complete until
242 * all of them were opened. By having a single journal transaction,
243 * we eliminate duplicate reservations for common blocks like the
244 * superblock and group descriptors or bitmaps.
246 * We will start the transaction here, but each prepare_write will
247 * add a refcount to the transaction, and each commit_write will
248 * remove a refcount. The transaction will be closed when all of
249 * the pages have been written.
251 static void *fsfilt_ext3_brw_start(int objcount, struct fsfilt_objinfo *fso,
252 int niocount, struct niobuf_local *nb,
253 void *desc_private, int logs)
260 LASSERT(current->journal_info == desc_private);
261 journal = EXT3_SB(fso->fso_dentry->d_inode->i_sb)->s_journal;
262 needed = fsfilt_ext3_credits_needed(objcount, fso, niocount, nb);
264 /* The number of blocks we could _possibly_ dirty can very large.
265 * We reduce our request if it is absurd (and we couldn't get that
266 * many credits for a single handle anyways).
268 * At some point we have to limit the size of I/Os sent at one time,
269 * increase the size of the journal, or we have to calculate the
270 * actual journal requirements more carefully by checking all of
271 * the blocks instead of being maximally pessimistic. It remains to
272 * be seen if this is a real problem or not.
274 if (needed > journal->j_max_transaction_buffers) {
275 CERROR("want too many journal credits (%d) using %d instead\n",
276 needed, journal->j_max_transaction_buffers);
277 needed = journal->j_max_transaction_buffers;
281 handle = journal_start(journal, needed);
283 if (IS_ERR(handle)) {
284 CERROR("can't get handle for %d credits: rc = %ld\n", needed,
287 LASSERT(handle->h_buffer_credits >= needed);
288 LASSERT(current->journal_info == handle);
294 static int fsfilt_ext3_commit(struct inode *inode, void *h, int force_sync)
297 handle_t *handle = h;
299 LASSERT(current->journal_info == handle);
301 handle->h_sync = 1; /* recovery likes this */
304 rc = journal_stop(handle);
307 // LASSERT(current->journal_info == NULL);
311 static int fsfilt_ext3_commit_async(struct inode *inode, void *h,
314 transaction_t *transaction;
315 unsigned long tid, rtid;
316 handle_t *handle = h;
320 LASSERT(current->journal_info == handle);
323 transaction = handle->h_transaction;
324 journal = transaction->t_journal;
325 tid = transaction->t_tid;
326 /* we don't want to be blocked */
328 rc = journal_stop(handle);
330 CERROR("error while stopping transaction: %d\n", rc);
334 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0)
335 rtid = log_start_commit(journal, transaction);
337 CERROR("strange race: %lu != %lu\n",
338 (unsigned long) tid, (unsigned long) rtid);
340 log_start_commit(journal, transaction->t_tid);
344 *wait_handle = (void *) tid;
345 CDEBUG(D_INODE, "commit async: %lu\n", (unsigned long) tid);
349 static int fsfilt_ext3_commit_wait(struct inode *inode, void *h)
351 tid_t tid = (tid_t)(long)h;
353 CDEBUG(D_INODE, "commit wait: %lu\n", (unsigned long) tid);
354 if (is_journal_aborted(EXT3_JOURNAL(inode)))
357 log_wait_commit(EXT3_JOURNAL(inode), tid);
362 static int fsfilt_ext3_setattr(struct dentry *dentry, void *handle,
363 struct iattr *iattr, int do_trunc)
365 struct inode *inode = dentry->d_inode;
370 /* A _really_ horrible hack to avoid removing the data stored
371 * in the block pointers; this is really the "small" stripe MD data.
372 * We can avoid further hackery by virtue of the MDS file size being
373 * zero all the time (which doesn't invoke block truncate at unlink
374 * time), so we assert we never change the MDS file size from zero. */
375 if (iattr->ia_valid & ATTR_SIZE && !do_trunc) {
376 /* ATTR_SIZE would invoke truncate: clear it */
377 iattr->ia_valid &= ~ATTR_SIZE;
378 EXT3_I(inode)->i_disksize = inode->i_size = iattr->ia_size;
380 /* make sure _something_ gets set - so new inode
381 * goes to disk (probably won't work over XFS */
382 if (!(iattr->ia_valid & (ATTR_MODE | ATTR_MTIME | ATTR_CTIME))){
383 iattr->ia_valid |= ATTR_MODE;
384 iattr->ia_mode = inode->i_mode;
388 /* Don't allow setattr to change file type */
389 iattr->ia_mode = (inode->i_mode & S_IFMT)|(iattr->ia_mode & ~S_IFMT);
391 /* We set these flags on the client, but have already checked perms
392 * so don't confuse inode_change_ok. */
393 iattr->ia_valid &= ~(ATTR_MTIME_SET | ATTR_ATIME_SET);
395 if (inode->i_op->setattr) {
396 rc = inode->i_op->setattr(dentry, iattr);
398 rc = inode_change_ok(inode, iattr);
400 rc = inode_setattr(inode, iattr);
408 static int fsfilt_ext3_iocontrol(struct inode * inode, struct file *file,
409 unsigned int cmd, unsigned long arg)
414 if (inode->i_fop->ioctl)
415 rc = inode->i_fop->ioctl(inode, file, cmd, arg);
424 static int fsfilt_ext3_set_md(struct inode *inode, void *handle,
425 void *lmm, int lmm_size)
429 #ifdef INLINE_EA /* can go away before 1.0 - just for testing bug 2097 now */
430 /* Nasty hack city - store stripe MD data in the block pointers if
431 * it will fit, because putting it in an EA currently kills the MDS
432 * performance. We'll fix this with "fast EAs" in the future.
434 if (inode->i_blocks == 0 && lmm_size <= sizeof(EXT3_I(inode)->i_data) -
435 sizeof(EXT3_I(inode)->i_data[0])) {
436 unsigned old_size = EXT3_I(inode)->i_data[0];
438 LASSERT(old_size < sizeof(EXT3_I(inode)->i_data));
439 CERROR("setting EA on %lu/%u again... interesting\n",
440 inode->i_ino, inode->i_generation);
443 EXT3_I(inode)->i_data[0] = cpu_to_le32(lmm_size);
444 memcpy(&EXT3_I(inode)->i_data[1], lmm, lmm_size);
445 mark_inode_dirty(inode);
450 /* keep this when we get rid of OLD_EA (too noisy during conversion) */
451 if (EXT3_I(inode)->i_file_acl /* || large inode EA flag */) {
452 CWARN("setting EA on %lu/%u again... interesting\n",
453 inode->i_ino, inode->i_generation);
458 /* this can go away before 1.0. For bug 2097 testing only. */
459 rc = ext3_xattr_set_handle(handle, inode, EXT3_XATTR_INDEX_LUSTRE,
460 XATTR_LUSTRE_MDS_OBJID, lmm, lmm_size, 0);
463 rc = ext3_xattr_set_handle(handle, inode, EXT3_XATTR_INDEX_TRUSTED,
464 XATTR_LUSTRE_MDS_LOV_EA, lmm, lmm_size, 0);
466 /* This tries to delete the old-format LOV EA, but only as long as we
467 * have successfully saved the new-format LOV EA (we can always try
468 * the conversion again the next time the file is accessed). It is
469 * possible (although unlikely) that the new-format LOV EA couldn't be
470 * saved because it ran out of space but we would need a file striped
471 * over least 123 OSTs before the two EAs filled a 4kB block.
473 * This can be removed when all filesystems have converted to the
474 * new EA format, but otherwise adds little if any overhead. If we
475 * wanted backward compatibility for existing files, we could keep
476 * the old EA around for a while but we'd have to clean it up later. */
477 if (rc >= 0 && old_ea) {
478 int err = ext3_xattr_set_handle(handle, inode,
479 EXT3_XATTR_INDEX_LUSTRE,
480 XATTR_LUSTRE_MDS_OBJID,
483 CERROR("error deleting old LOV EA on %lu/%u: rc %d\n",
484 inode->i_ino, inode->i_generation, err);
490 CERROR("error adding MD data to inode %lu: rc = %d\n",
495 /* Must be called with i_sem held */
496 static int fsfilt_ext3_get_md(struct inode *inode, void *lmm, int lmm_size)
500 LASSERT(down_trylock(&inode->i_sem) != 0);
502 /* Keep support for reading "inline EAs" until we convert
503 * users over to new format entirely. See bug 841/2097. */
504 if (inode->i_blocks == 0 && EXT3_I(inode)->i_data[0]) {
505 unsigned size = le32_to_cpu(EXT3_I(inode)->i_data[0]);
508 LASSERT(size < sizeof(EXT3_I(inode)->i_data));
510 if (size > lmm_size) {
511 CERROR("inline EA on %lu/%u bad size %u > %u\n",
512 inode->i_ino, inode->i_generation,
516 memcpy(lmm, &EXT3_I(inode)->i_data[1], size);
520 /* migrate LOV EA data to external block - keep same format */
521 CWARN("DEBUG: migrate inline EA for inode %lu/%u to block\n",
522 inode->i_ino, inode->i_generation);
524 handle = journal_start(EXT3_JOURNAL(inode),
525 EXT3_XATTR_TRANS_BLOCKS);
526 if (!IS_ERR(handle)) {
528 rc = fsfilt_ext3_set_md(inode, handle,
529 &EXT3_I(inode)->i_data[1],size);
531 memset(EXT3_I(inode)->i_data, 0,
532 sizeof(EXT3_I(inode)->i_data));
533 mark_inode_dirty(inode);
535 err = journal_stop(handle);
539 rc = PTR_ERR(handle);
546 rc = ext3_xattr_get(inode, EXT3_XATTR_INDEX_TRUSTED,
547 XATTR_LUSTRE_MDS_LOV_EA, lmm, lmm_size);
548 /* try old EA type if new one failed - MDS will convert it for us */
549 if (rc == -ENODATA) {
550 CDEBUG(D_INFO,"failed new LOV EA %d/%s from inode %lu: rc %d\n",
551 EXT3_XATTR_INDEX_TRUSTED, XATTR_LUSTRE_MDS_LOV_EA,
554 rc = ext3_xattr_get(inode, EXT3_XATTR_INDEX_LUSTRE,
555 XATTR_LUSTRE_MDS_OBJID, lmm, lmm_size);
559 /* This gives us the MD size */
561 return (rc == -ENODATA) ? 0 : rc;
564 CDEBUG(D_INFO, "error getting EA %d/%s from inode %lu: rc %d\n",
565 EXT3_XATTR_INDEX_LUSTRE, XATTR_LUSTRE_MDS_OBJID,
567 memset(lmm, 0, lmm_size);
568 return (rc == -ENODATA) ? 0 : rc;
574 static ssize_t fsfilt_ext3_readpage(struct file *file, char *buf, size_t count,
577 struct inode *inode = file->f_dentry->d_inode;
580 if (S_ISREG(inode->i_mode))
581 rc = file->f_op->read(file, buf, count, off);
583 const int blkbits = inode->i_sb->s_blocksize_bits;
584 const int blksize = inode->i_sb->s_blocksize;
586 CDEBUG(D_EXT2, "reading "LPSZ" at dir %lu+%llu\n",
587 count, inode->i_ino, *off);
589 struct buffer_head *bh;
592 if (*off < inode->i_size) {
595 bh = ext3_bread(NULL, inode, *off >> blkbits,
598 CDEBUG(D_EXT2, "read %u@%llu\n", blksize, *off);
601 memcpy(buf, bh->b_data, blksize);
604 /* XXX in theory we should just fake
605 * this buffer and continue like ext3,
606 * especially if this is a partial read
608 CERROR("error read dir %lu+%llu: %d\n",
609 inode->i_ino, *off, err);
614 struct ext3_dir_entry_2 *fake = (void *)buf;
616 CDEBUG(D_EXT2, "fake %u@%llu\n", blksize, *off);
617 memset(fake, 0, sizeof(*fake));
618 fake->rec_len = cpu_to_le32(blksize);
630 static void fsfilt_ext3_cb_func(struct journal_callback *jcb, int error)
632 struct fsfilt_cb_data *fcb = (struct fsfilt_cb_data *)jcb;
634 fcb->cb_func(fcb->cb_obd, fcb->cb_last_rcvd, fcb->cb_data, error);
636 OBD_SLAB_FREE(fcb, fcb_cache, sizeof *fcb);
637 atomic_dec(&fcb_cache_count);
640 static int fsfilt_ext3_add_journal_cb(struct obd_device *obd, __u64 last_rcvd,
641 void *handle, fsfilt_cb_t cb_func,
644 struct fsfilt_cb_data *fcb;
646 OBD_SLAB_ALLOC(fcb, fcb_cache, GFP_NOFS, sizeof *fcb);
650 atomic_inc(&fcb_cache_count);
651 fcb->cb_func = cb_func;
653 fcb->cb_last_rcvd = last_rcvd;
654 fcb->cb_data = cb_data;
656 CDEBUG(D_EXT2, "set callback for last_rcvd: "LPD64"\n", last_rcvd);
658 journal_callback_set(handle, fsfilt_ext3_cb_func,
659 (struct journal_callback *)fcb);
666 * We need to hack the return value for the free inode counts because
667 * the current EA code requires one filesystem block per inode with EAs,
668 * so it is possible to run out of blocks before we run out of inodes.
670 * This can be removed when the ext3 EA code is fixed.
672 static int fsfilt_ext3_statfs(struct super_block *sb, struct obd_statfs *osfs)
677 memset(&sfs, 0, sizeof(sfs));
679 rc = sb->s_op->statfs(sb, &sfs);
681 if (!rc && sfs.f_bfree < sfs.f_ffree) {
682 sfs.f_files = (sfs.f_files - sfs.f_ffree) + sfs.f_bfree;
683 sfs.f_ffree = sfs.f_bfree;
686 statfs_pack(osfs, &sfs);
690 static int fsfilt_ext3_sync(struct super_block *sb)
692 return ext3_force_commit(sb);
695 extern int ext3_map_inode_page(struct inode *inode, struct page *page,
696 unsigned long *blocks, int *created, int create);
697 int fsfilt_ext3_map_inode_page(struct inode *inode, struct page *page,
698 unsigned long *blocks, int *created, int create)
700 return ext3_map_inode_page(inode, page, blocks, created, create);
703 extern int ext3_prep_san_write(struct inode *inode, long *blocks,
704 int nblocks, loff_t newsize);
705 static int fsfilt_ext3_prep_san_write(struct inode *inode, long *blocks,
706 int nblocks, loff_t newsize)
708 return ext3_prep_san_write(inode, blocks, nblocks, newsize);
711 static int fsfilt_ext3_read_record(struct file * file, void *buf,
712 int size, loff_t *offs)
714 struct inode *inode = file->f_dentry->d_inode;
716 struct buffer_head *bh;
717 int err, blocksize, csize, boffs;
719 /* prevent reading after eof */
721 if (inode->i_size < *offs + size) {
722 size = inode->i_size - *offs;
725 CERROR("size %llu is too short for read %u@%llu\n",
726 inode->i_size, size, *offs);
728 } else if (size == 0) {
735 blocksize = 1 << inode->i_blkbits;
738 block = *offs >> inode->i_blkbits;
739 boffs = *offs & (blocksize - 1);
740 csize = min(blocksize - boffs, size);
741 bh = ext3_bread(NULL, inode, block, 0, &err);
743 CERROR("can't read block: %d\n", err);
747 memcpy(buf, bh->b_data + boffs, csize);
757 static int fsfilt_ext3_write_record(struct file *file, void *buf, int bufsize,
758 loff_t *offs, int force_sync)
760 struct buffer_head *bh = NULL;
762 struct inode *inode = file->f_dentry->d_inode;
763 loff_t old_size = inode->i_size, offset = *offs;
764 loff_t new_size = inode->i_size;
767 int err, block_count = 0, blocksize, size, boffs;
769 /* Determine how many transaction credits are needed */
770 blocksize = 1 << inode->i_blkbits;
771 block_count = (*offs & (blocksize - 1)) + bufsize;
772 block_count = (block_count + blocksize - 1) >> inode->i_blkbits;
774 journal = EXT3_SB(inode->i_sb)->s_journal;
776 handle = journal_start(journal,
777 block_count * EXT3_DATA_TRANS_BLOCKS + 2);
779 if (IS_ERR(handle)) {
780 CERROR("can't start transaction\n");
781 return PTR_ERR(handle);
784 while (bufsize > 0) {
788 block = offset >> inode->i_blkbits;
789 boffs = offset & (blocksize - 1);
790 size = min(blocksize - boffs, bufsize);
791 bh = ext3_bread(handle, inode, block, 1, &err);
793 CERROR("can't read/create block: %d\n", err);
797 err = ext3_journal_get_write_access(handle, bh);
799 CERROR("journal_get_write_access() returned error %d\n",
803 LASSERT(bh->b_data + boffs + size <= bh->b_data + bh->b_size);
804 memcpy(bh->b_data + boffs, buf, size);
805 err = ext3_journal_dirty_metadata(handle, bh);
807 CERROR("journal_dirty_metadata() returned error %d\n",
811 if (offset + size > new_size)
812 new_size = offset + size;
819 handle->h_sync = 1; /* recovery likes this */
824 /* correct in-core and on-disk sizes */
825 if (new_size > inode->i_size) {
827 if (new_size > inode->i_size)
828 inode->i_size = new_size;
829 if (inode->i_size > EXT3_I(inode)->i_disksize)
830 EXT3_I(inode)->i_disksize = inode->i_size;
831 if (inode->i_size > old_size)
832 mark_inode_dirty(inode);
837 journal_stop(handle);
845 static int fsfilt_ext3_setup(struct super_block *sb)
848 EXT3_SB(sb)->dx_lock = fsfilt_ext3_dx_lock;
849 EXT3_SB(sb)->dx_unlock = fsfilt_ext3_dx_unlock;
852 CWARN("Enabling PDIROPS\n");
853 set_opt(EXT3_SB(sb)->s_mount_opt, PDIROPS);
854 sb->s_flags |= S_PDIROPS;
859 /* If fso is NULL, op is FSFILT operation, otherwise op is number of fso
860 objects. Logs is number of logfiles to update */
861 static int fsfilt_ext3_get_op_len(int op, struct fsfilt_objinfo *fso, int logs)
865 case FSFILT_OP_CREATE:
866 /* directory leaf, index & indirect & EA*/
868 case FSFILT_OP_UNLINK:
874 struct super_block *sb = fso->fso_dentry->d_inode->i_sb;
875 int blockpp = 1 << (PAGE_CACHE_SHIFT - sb->s_blocksize_bits);
876 int addrpp = EXT3_ADDR_PER_BLOCK(sb) * blockpp;
877 for (i = 0; i < op; i++, fso++) {
878 int nblocks = fso->fso_bufcnt * blockpp;
879 int ndindirect = min(nblocks, addrpp + 1);
880 int nindir = nblocks + ndindirect + 1;
884 return needed + 3 * logs;
890 static struct fsfilt_operations fsfilt_ext3_ops = {
892 fs_owner: THIS_MODULE,
893 fs_start: fsfilt_ext3_start,
894 fs_brw_start: fsfilt_ext3_brw_start,
895 fs_commit: fsfilt_ext3_commit,
896 fs_commit_async: fsfilt_ext3_commit_async,
897 fs_commit_wait: fsfilt_ext3_commit_wait,
898 fs_setattr: fsfilt_ext3_setattr,
899 fs_iocontrol: fsfilt_ext3_iocontrol,
900 fs_set_md: fsfilt_ext3_set_md,
901 fs_get_md: fsfilt_ext3_get_md,
902 fs_readpage: fsfilt_ext3_readpage,
903 fs_add_journal_cb: fsfilt_ext3_add_journal_cb,
904 fs_statfs: fsfilt_ext3_statfs,
905 fs_sync: fsfilt_ext3_sync,
906 fs_map_inode_page: fsfilt_ext3_map_inode_page,
907 fs_prep_san_write: fsfilt_ext3_prep_san_write,
908 fs_write_record: fsfilt_ext3_write_record,
909 fs_read_record: fsfilt_ext3_read_record,
910 fs_setup: fsfilt_ext3_setup,
911 fs_get_op_len: fsfilt_ext3_get_op_len,
914 static int __init fsfilt_ext3_init(void)
918 //rc = ext3_xattr_register();
919 fcb_cache = kmem_cache_create("fsfilt_ext3_fcb",
920 sizeof(struct fsfilt_cb_data), 0,
923 CERROR("error allocating fsfilt journal callback cache\n");
924 GOTO(out, rc = -ENOMEM);
927 rc = fsfilt_register_ops(&fsfilt_ext3_ops);
930 kmem_cache_destroy(fcb_cache);
935 static void __exit fsfilt_ext3_exit(void)
939 fsfilt_unregister_ops(&fsfilt_ext3_ops);
940 rc = kmem_cache_destroy(fcb_cache);
942 if (rc || atomic_read(&fcb_cache_count)) {
943 CERROR("can't free fsfilt callback cache: count %d, rc = %d\n",
944 atomic_read(&fcb_cache_count), rc);
947 //rc = ext3_xattr_unregister();
950 module_init(fsfilt_ext3_init);
951 module_exit(fsfilt_ext3_exit);
953 MODULE_AUTHOR("Cluster File Systems, Inc. <info@clusterfs.com>");
954 MODULE_DESCRIPTION("Lustre ext3 Filesystem Helper v0.1");
955 MODULE_LICENSE("GPL");