1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
2 * vim:expandtab:shiftwidth=8:tabstop=8:
4 * Lustre filesystem abstraction routines
6 * Copyright (C) 2002, 2003 Cluster File Systems, Inc.
7 * Author: Andreas Dilger <adilger@clusterfs.com>
9 * This file is part of Lustre, http://www.lustre.org.
11 * Lustre is free software; you can redistribute it and/or
12 * modify it under the terms of version 2 of the GNU General Public
13 * License as published by the Free Software Foundation.
15 * Lustre is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with Lustre; if not, write to the Free Software
22 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24 #define DEBUG_SUBSYSTEM S_FILTER
26 #include <linux/init.h>
27 #include <linux/module.h>
29 #include <linux/jbd.h>
30 #include <linux/slab.h>
31 #include <linux/pagemap.h>
32 #include <linux/quotaops.h>
33 #include <linux/ext3_fs.h>
34 #include <linux/ext3_jbd.h>
35 #include <linux/ext3_extents.h>
36 #include <linux/version.h>
37 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
38 #include <linux/locks.h>
39 #include <linux/ext3_xattr.h>
40 #include <linux/module.h>
41 #include <linux/iobuf.h>
43 #include <ext3/xattr.h>
46 #include <linux/kp30.h>
47 #include <linux/lustre_fsfilt.h>
48 #include <linux/obd.h>
49 #include <linux/obd_class.h>
50 #include <linux/lustre_smfs.h>
51 #include <linux/lustre_snap.h>
53 /* For snapfs in EXT3 flags --- FIXME will find other ways to store it*/
54 #define EXT3_COW_FL 0x00100000 /* inode is snapshot cow */
55 #define EXT3_DEL_FL 0x00200000 /* inode is deleting in snapshot */
57 #define EXT3_SNAP_ATTR "@snap"
58 #define EXT3_SNAP_GENERATION "@snap_generation"
59 #define EXT3_MAX_SNAPS 20
60 #define EXT3_MAX_SNAP_DATA (sizeof(struct snap_ea))
61 #define EXT3_SNAP_INDEX EXT3_XATTR_INDEX_LUSTRE
63 #define SB_SNAPTABLE_INO(sb) (EXT3_SB(sb)->s_es->s_snaptable_ino)
64 #define SB_FEATURE_COMPAT(sb) (EXT3_SB(sb)->s_es->s_feature_compat)
66 #define SNAP_HAS_COMPAT_FEATURE(sb,mask) \
67 (SB_FEATURE_COMPAT(sb) & cpu_to_le32(mask))
69 #define EXT3_FEATURE_COMPAT_SNAPFS 0x0010
70 #define EXT3_FEATURE_COMPAT_BLOCKCOW 0x0020
71 /*snaptable info for EXT3*/
72 #define EXT3_SNAPTABLE_EA "@snaptable"
74 /* NOTE: these macros are close dependant on the structure of snap ea */
75 #define SNAP_CNT_FROM_SIZE(size) ((((size)-sizeof(ino_t)*2)/2)/sizeof(ino_t))
76 #define SNAP_EA_SIZE_FROM_INDEX(index) (sizeof(ino_t)*2 + 2*sizeof(ino_t)*((index)+1))
78 #define SNAP_EA_INO_BLOCK_SIZE(size) (((size)-sizeof(ino_t)*2)/2)
79 #define SNAP_EA_PARENT_OFFSET(size) (sizeof(ino_t)*2 + SNAP_EA_INO_BLOCK_SIZE((size)))
81 #define EXT3_JOURNAL_START(sb, handle, blocks, rc) \
84 journal = EXT3_SB(sb)->s_journal; \
86 handle = journal_start(journal, 1); \
88 if(IS_ERR(handle)) { \
89 CERROR("can't start transaction\n"); \
90 rc = PTR_ERR(handle); \
96 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
97 static inline void double_lock_inode(struct inode *i1, struct inode *i2)
102 double_down(&i1->i_sem, &i2->i_sem);
104 static inline void double_unlock_inode(struct inode *i1, struct inode *i2)
109 double_up(&i1->i_sem, &i2->i_sem);
112 static inline void double_lock_inode(struct inode *i1, struct inode *i2)
114 struct semaphore *s1 = &i1->i_sem;
115 struct semaphore *s2 = &i2->i_sem;
118 if ((unsigned long) s1 < (unsigned long) s2) {
119 struct semaphore *tmp = s2;
127 static inline void double_unlock_inode(struct inode *i1, struct inode *i2)
129 struct semaphore *s1 = &i1->i_sem;
130 struct semaphore *s2 = &i2->i_sem;
139 /* helper functions to manipulate field 'parent' in snap_ea */
141 set_parent_ino(struct snap_ea *pea, int size, int index, ino_t val)
143 char * p = (char*) pea;
146 offset = sizeof(ino_t)*2 + (size - sizeof(ino_t)*2)/2;
147 offset += sizeof(ino_t) * index;
148 *(ino_t*)(p+offset) = val;
153 * fsfilt_ext3_get_indirect - get a specific indirect inode from a primary inode
154 * @primary: primary (direct) inode
155 * @table: table of @slot + 1 indices in reverse chronological order
156 * @slot: starting slot number to check for indirect inode number
158 * We locate an indirect inode from a primary inode using the redirection
159 * table stored in the primary inode. Because the desired inode may actually
160 * be in a "newer" slot number than the supplied slot, we are given a table
161 * of indices in chronological order to search for the correct inode number.
162 * We walk table from @slot to 0 looking for a non-zero inode to load.
164 * To only load a specific index (and fail if it does not exist), you can
165 * pass @table = NULL, and the index number in @slot. If @slot == 0, the
166 * primary inode data is returned.
168 * We return a pointer to an inode, or an error. If the indirect inode for
169 * the given index does not exist, NULL is returned.
171 static struct inode *fsfilt_ext3_get_indirect(struct inode *primary, int *table,
174 char buf[EXT3_MAX_SNAP_DATA];
175 struct snap_ea *snaps;
177 struct inode *inode = NULL;
178 int rc = 0, index = 0;
182 if (slot < 0 || slot > EXT3_MAX_SNAPS || !primary)
185 CDEBUG(D_INODE, "ino %lu, table %p, slot %d\n", primary->i_ino, table,
187 rc = ext3_xattr_get(primary, EXT3_SNAP_INDEX, EXT3_SNAP_ATTR, buf,
189 if (rc == -ENODATA) {
192 CERROR("attribute read rc=%d \n", rc);
195 snaps = (struct snap_ea *)buf;
197 /* if table is NULL and there is a slot */
198 if( !table && slot >= 0) {
200 ino = le32_to_cpu(snaps->ino[index]);
202 inode = iget(primary->i_sb, ino);
205 /* if table is not NULL */
206 while (!inode && slot >= 0 && table) {
208 ino = le32_to_cpu(snaps->ino[index]);
210 CDEBUG(D_INODE, "snap inode at slot %d is %lu\n", slot, ino);
215 inode = iget(primary->i_sb, ino);
218 if( slot == -1 && table ) {
219 CDEBUG(D_INODE, "redirector not found, using primary\n");
220 inode = iget(primary->i_sb, primary->i_ino);
226 /* Save the indirect inode in the snapshot table of the primary inode. */
227 static int fsfilt_ext3_set_indirect(struct inode *pri, int index, ino_t ind_ino,
230 char buf[EXT3_MAX_SNAP_DATA];
231 struct snap_ea *snaps;
232 int rc = 0, inlist = 1;
234 handle_t *handle = NULL;
237 CDEBUG(D_INODE, "(ino %lu, parent %lu): saving ind %lu to index %d\n",
238 pri->i_ino, parent_ino, ind_ino, index);
240 if (index < 0 || index > MAX_SNAPS || !pri)
242 /* need lock the list before get_attr() to avoid race */
243 /* read ea at first */
244 rc = ext3_xattr_get(pri, EXT3_SNAP_INDEX ,EXT3_SNAP_ATTR,
245 buf, EXT3_MAX_SNAP_DATA);
246 if (rc == -ENODATA || rc == -ENODATA) {
247 CDEBUG(D_INODE, "no extended attributes - zeroing\n");
248 memset(buf, 0, EXT3_MAX_SNAP_DATA);
250 * To judge a inode in list, we only see if it has snap ea.
251 * So take care of snap ea of primary inodes very carefully.
252 * Is it right in snapfs EXT3, check it later?
256 } else if (rc < 0 || rc > EXT3_MAX_SNAP_DATA) {
257 GOTO(out_unlock, rc);
259 EXT3_JOURNAL_START(pri->i_sb, handle, SNAP_SETIND_TRANS_BLOCKS, rc);
261 GOTO(out_unlock, rc = PTR_ERR(handle));
263 snaps = (struct snap_ea *)buf;
264 snaps->ino[index] = cpu_to_le32 (ind_ino);
265 ea_size = EXT3_MAX_SNAP_DATA;
267 set_parent_ino(snaps, ea_size, index, cpu_to_le32(parent_ino));
269 rc = ext3_xattr_set_handle(handle, pri, EXT3_SNAP_INDEX,EXT3_SNAP_ATTR,
270 buf, EXT3_MAX_SNAP_DATA, 0);
271 ext3_mark_inode_dirty(handle, pri);
272 journal_stop(handle);
277 static int ext3_set_generation(struct inode *inode, unsigned long gen)
283 EXT3_JOURNAL_START(inode->i_sb, handle, EXT3_XATTR_TRANS_BLOCKS, err);
287 err = ext3_xattr_set_handle(handle, inode, EXT3_SNAP_INDEX,
288 EXT3_SNAP_GENERATION, (char*)&gen,
291 CERROR("ino %lu, set_ext_attr err %d\n", inode->i_ino, err);
295 journal_stop(handle);
300 * Copy inode metadata from one inode to another, excluding blocks and size.
301 * FIXME do we copy EA data - ACLs and such (excluding snapshot data)?
303 static void ext3_copy_meta(handle_t *handle, struct inode *dst, struct inode *src)
307 dst->i_mode = src->i_mode;
308 dst->i_nlink = src->i_nlink;
309 dst->i_uid = src->i_uid;
310 dst->i_gid = src->i_gid;
311 dst->i_atime = src->i_atime;
312 dst->i_mtime = src->i_mtime;
313 dst->i_ctime = src->i_ctime;
314 // dst->i_version = src->i_version;
316 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
317 dst->i_attr_flags = src->i_attr_flags;
319 dst->i_generation = src->i_generation;
320 EXT3_I(dst)->i_dtime = EXT3_I(src)->i_dtime;
321 EXT3_I(dst)->i_flags = EXT3_I(src)->i_flags | EXT3_COW_FL;
322 #ifdef EXT3_FRAGMENTS
323 EXT3_I(dst)->i_faddr = EXT3_I(src)->i_faddr;
324 EXT3_I(dst)->i_frag_no = EXT3_I(src)->i_frag_no;
325 EXT3_I(dst)->i_frag_size = EXT3_I(src)->i_frag_size;
327 if ((size = ext3_xattr_list(src, NULL, 0)) > 0) {
332 if (ext3_xattr_list(src, names, 0) < 0)
335 * the list of attribute names are stored as NUL terminated
336 * strings, with a double NUL string at the end.
339 while ((namelen = strlen(name))) {
343 /* don't copy snap data */
344 if (!strcmp(name, EXT3_SNAP_ATTR)) {
345 CDEBUG(D_INFO, "skipping %s item\n", name);
348 CDEBUG(D_INODE, "copying %s item\n", name);
349 attrlen = ext3_xattr_get(src, EXT3_SNAP_INDEX,
350 EXT3_SNAP_ATTR, NULL, 0);
353 OBD_ALLOC(buf, attrlen);
359 if (ext3_xattr_get(src, EXT3_SNAP_INDEX,
360 EXT3_SNAP_ATTR, buf, attrlen) < 0)
362 if (ext3_xattr_set_handle(handle, dst, EXT3_SNAP_INDEX,
363 EXT3_SNAP_ATTR, buf, attrlen,
366 OBD_FREE(buf, attrlen);
367 name += namelen + 1; /* skip name and trailing NUL */
371 static int ext3_copy_reg_block(struct inode *dst, struct inode *src, int blk)
373 struct page *src_page, *dst_page;
374 loff_t offset = blk << src->i_sb->s_blocksize_bits;
375 unsigned long index = offset >> PAGE_CACHE_SHIFT;
379 /*read the src page*/
380 src_page = grab_cache_page(src->i_mapping, index);
381 if (src_page == NULL)
384 if (!PageUptodate(src_page)) {
385 rc = src->i_mapping->a_ops->readpage(NULL, src_page);
387 page_cache_release(src_page);
394 dst_page = grab_cache_page(dst->i_mapping, index);
395 if (dst_page == NULL)
396 GOTO(src_page_unlock, rc = -ENOMEM);
399 rc = dst->i_mapping->a_ops->prepare_write(NULL, dst_page, 0,
400 PAGE_CACHE_SIZE - 1);
402 GOTO(dst_page_unlock, rc = -EFAULT);
403 memcpy(page_address(dst_page), page_address(src_page), PAGE_CACHE_SIZE);
405 flush_dcache_page(dst_page);
407 rc = dst->i_mapping->a_ops->commit_write(NULL, dst_page, 0,
408 PAGE_CACHE_SIZE - 1);
413 unlock_page(dst_page);
414 page_cache_release(dst_page);
417 page_cache_release(src_page);
420 static int ext3_copy_dir_block(struct inode *dst, struct inode *src, int blk)
422 struct buffer_head *bh_dst = NULL, *bh_src = NULL;
424 handle_t *handle = NULL;
427 EXT3_JOURNAL_START(dst->i_sb, handle, SNAP_COPYBLOCK_TRANS_BLOCKS, rc);
431 bh_src = ext3_bread(handle, src, blk, 0, &rc);
433 CERROR("rcor for src blk %d, rcor %d\n", blk, rc);
434 GOTO(exit_relese, rc);
436 bh_dst = ext3_getblk(handle, dst, blk, 1, &rc);
438 CERROR("rcor for dst blk %d, rcor %d\n", blk, rc);
439 GOTO(exit_relese, rc);
441 CDEBUG(D_INODE, "copy block %lu to %lu (%ld bytes)\n",
442 bh_src->b_blocknr, bh_dst->b_blocknr, src->i_sb->s_blocksize);
444 ext3_journal_get_write_access(handle, bh_dst);
445 memcpy(bh_dst->b_data, bh_src->b_data, src->i_sb->s_blocksize);
446 ext3_journal_dirty_metadata(handle, bh_dst);
450 if (bh_src) brelse(bh_src);
451 if (bh_dst) brelse(bh_dst);
453 journal_stop(handle);
456 /* fsfilt_ext3_copy_block - copy one data block from inode @src to @dst.
457 No lock here. User should do the lock.
458 User should check the return value to see if the result is correct.
460 1: The block has been copied successfully
461 0: No block is copied, usually this is because src has no such blk
465 static int fsfilt_ext3_copy_block (struct inode *dst, struct inode *src, int blk)
469 CDEBUG(D_INODE, "copy blk %d from %lu to %lu \n", blk, src->i_ino,
472 * ext3_getblk() require handle!=NULL
474 if (S_ISREG(src->i_mode)) {
475 rc = ext3_copy_reg_block(dst, src, blk);
477 rc = ext3_copy_dir_block(dst, src, blk);
483 static inline int ext3_has_ea(struct inode *inode)
485 return (EXT3_I(inode)->i_file_acl != 0);
487 /* XXXThis function has a very bad effect to
488 * the performance of filesystem,
489 * will find another way to fix it
491 static void fs_flushinval_pages(handle_t *handle, struct inode* inode)
493 if (inode->i_blocks > 0 && inode->i_mapping) {
494 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
495 fsync_inode_data_buffers(inode);
497 truncate_inode_pages(inode->i_mapping, 0);
500 /* ext3_migrate_data:
501 * MOVE all the data blocks from inode src to inode dst as well as
502 * COPY all attributes(meta data) from inode src to inode dst.
503 * For extended attributes(EA), we COPY all the EAs but skip the Snap EA from
504 * src to dst. If the dst has Snap EA, then we CAN'T overwrite it. We CAN'T
505 * copy the src Snap EA. XXX for EA, can we change it to MOVE all the EAs
506 * (exclude Snap EA) to dst and copy it back to src ? This is for LAN free
509 static int ext3_migrate_data(handle_t *handle, struct inode *dst,
512 unsigned long err = 0;
513 /* 512 byte disk blocks per inode block */
514 int bpib = src->i_sb->s_blocksize >> 9;
521 if (dst->i_ino == src->i_ino)
524 fs_flushinval_pages(handle, src);
526 ext3_copy_meta(handle, dst, src);
528 CDEBUG(D_INODE, "migrating data blocks from %lu to %lu\n",
529 src->i_ino, dst->i_ino);
530 /* Can't check blocks in case of EAs */
532 memcpy(EXT3_I(dst)->i_data, EXT3_I(src)->i_data,
533 sizeof(EXT3_I(src)->i_data));
534 memset(EXT3_I(src)->i_data, 0, sizeof(EXT3_I(src)->i_data));
536 ext3_discard_prealloc(src);
538 dst->i_size = EXT3_I(dst)->i_disksize = EXT3_I(src)->i_disksize;
539 src->i_size = EXT3_I(src)->i_disksize = 0;
541 dst->i_blocks = src->i_blocks;
543 /* Check EA blocks here to modify i_blocks correctly */
544 if(ext3_has_ea (src)) {
545 src->i_blocks += bpib;
546 if( ! ext3_has_ea (dst) )
547 if( dst->i_blocks >= bpib )
548 dst->i_blocks -= bpib;
550 if( ext3_has_ea (dst))
551 dst->i_blocks += bpib;
554 CDEBUG(D_INODE, "migrate data from ino %lu to ino %lu\n", src->i_ino,
556 ext3_mark_inode_dirty(handle, src);
557 ext3_mark_inode_dirty(handle, dst);
561 static handle_t * ext3_copy_data(handle_t *handle, struct inode *dst,
562 struct inode *src, int *has_orphan)
564 unsigned long blocks, blk, cur_blks;
565 int low_credits, save_ref;
569 blocks =(src->i_size + src->i_sb->s_blocksize-1) >>
570 src->i_sb->s_blocksize_bits;
571 low_credits = handle->h_buffer_credits - SNAP_BIGCOPY_TRANS_BLOCKS;
573 CDEBUG(D_INODE, "%lu blocks need to be copied,low credits limit %d\n",
574 blocks, low_credits);
576 for (blk = 0, cur_blks= dst->i_blocks; blk < blocks; blk++) {
577 if (!ext3_bmap(src->i_mapping, blk))
579 if(handle->h_buffer_credits <= low_credits) {
580 int needed = (blocks - blk) * EXT3_DATA_TRANS_BLOCKS;
581 if (needed > 4 * SNAP_COPYBLOCK_TRANS_BLOCKS)
582 needed = 4 * SNAP_COPYBLOCK_TRANS_BLOCKS;
583 if (journal_extend(handle, needed)) {
584 CDEBUG(D_INFO, "create_indirect:fail to extend "
585 "journal, restart trans\n");
588 CDEBUG(D_INODE, "add orphan ino %lu"
589 "nlink %d to orphan list \n",
590 dst->i_ino, dst->i_nlink);
591 ext3_orphan_add(handle, dst);
594 EXT3_I(dst)->i_disksize =
595 blk * dst->i_sb->s_blocksize;
596 dst->i_blocks = cur_blks;
597 dst->i_mtime = CURRENT_TIME;
598 ext3_mark_inode_dirty(handle, dst);
600 * We can be sure the last handle was stoped
601 * ONLY if the handle's reference count is 1
603 save_ref = handle->h_ref;
605 if(journal_stop(handle) ){
606 CERROR("fail to stop journal\n");
610 EXT3_JOURNAL_START(dst->i_sb, handle,
611 low_credits + needed, err);
613 handle->h_ref = save_ref;
616 if (fsfilt_ext3_copy_block( dst, src, blk) < 0 )
618 cur_blks += dst->i_sb->s_blocksize / 512;
621 dst->i_size = EXT3_I(dst)->i_disksize = src->i_size;
624 /*Here delete the data of that pri inode
625 *FIXME later, should throw the blocks of
626 *primary inode directly
628 static int ext3_throw_inode_data(handle_t *handle, struct inode *inode)
630 struct inode *tmp = NULL;
632 tmp = ext3_new_inode(handle, inode, (int)inode->i_mode, 0);
634 CERROR("ext3_new_inode error\n");
637 double_lock_inode(inode, tmp);
638 ext3_migrate_data(handle, tmp, inode);
639 double_unlock_inode(inode, tmp);
645 * fsfilt_ext3_create_indirect - copy data, attributes from primary to new indir inode
646 * @pri: primary (source) inode
647 * @index: index in snapshot table where indirect inode should be stored
648 * @delete: flag that the primary inode is being deleted
650 * We copy all of the data blocks from the @*src inode to the @*dst inode, as
651 * well as copying the attributes from @*src to @*dst. If @delete == 1, then
652 * the primary inode will only be a redirector and will appear deleted.
654 * FIXME do we move EAs, only non-snap EAs, what?
655 * FIXME we could do readpage/writepage, but we would have to handle block
656 * allocation then, and it ruins sparse files for 1k/2k filesystems,
657 * at the expense of doing a memcpy.
659 static struct inode* fsfilt_ext3_create_indirect(struct inode *pri, int index,
661 struct inode* parent,
664 struct inode *ind = NULL;
665 handle_t *handle = NULL;
670 if( pri == EXT3_SB(pri->i_sb)->s_journal_inode ){
671 CERROR("TRY TO COW JOUNRAL\n");
672 RETURN(ERR_PTR(-EINVAL));
674 CDEBUG(D_INODE, "creating indirect inode for %lu at index %d, %s pri\n",
675 pri->i_ino, index, del ? "deleting" : "preserve");
677 ind = fsfilt_ext3_get_indirect(pri, NULL, index);
679 EXT3_JOURNAL_START(pri->i_sb, handle, SNAP_CREATEIND_TRANS_BLOCKS,
682 RETURN(ERR_PTR(err));
683 /* XXX ? We should pass an err argument to get_indirect and precisely
684 * detect the errors, for some errors, we should exit right away.
687 /* if the option is SNAP_DEL_PRI_WITH_IND and there is an indirect,
688 * we just free the primary data blocks and mark this inode delete
690 if((del) && ind && !IS_ERR(ind)) {
691 /* for directory, we don't free the data blocks,
692 * or ext3_rmdir will report errors "bad dir, no data blocks"
694 CDEBUG(D_INODE, "del==SNAP_DEL_PRI_WITH_IND && ind\n");
695 if(!S_ISDIR(pri->i_mode)) {
696 err = ext3_throw_inode_data(handle, pri);
701 EXT3_I(pri)->i_dtime = LTIME_S(CURRENT_TIME);
702 ext3_mark_inode_dirty(handle, pri);
706 if (ind && !IS_ERR(ind)) {
707 CDEBUG(D_INODE, "existing indirect ino %lu for %lu: index %d\n",
708 ind->i_ino, pri->i_ino, index);
713 /* XXX: check this, ext3_new_inode, the first arg should be "dir" */
714 ind = ext3_new_inode(handle, pri, (int)pri->i_mode, 0);
718 CDEBUG(D_INODE, "got new inode %lu\n", ind->i_ino);
719 ind->i_rdev = pri->i_rdev;
720 ind->i_op = pri->i_op;
723 memcpy(ind->i_op, pri->i_op, sizeof(*pri->i_op));
724 memcpy(ind->i_fop, pri->i_fop, sizeof(*pri->i_fop));
725 memcpy(ind->i_mapping->a_ops, pri->i_mapping->a_ops,
726 sizeof(*pri->i_mapping->a_ops));
728 ext3_set_generation(ind, (unsigned long)gen);
729 /* If we are deleting the primary inode, we want to ensure that it is
730 * written to disk with a non-zero link count, otherwise the next iget
731 * and iput will mark the inode as free (which we don't want, we want
732 * it to stay a redirector). We fix this in ext3_destroy_indirect()
733 * when the last indirect inode is removed.
735 * We then do what ext3_delete_inode() does so that the metadata will
736 * appear the same as a deleted inode, and we can detect it later.
739 CDEBUG(D_INODE, "deleting primary inode\n");
742 err = ext3_migrate_data(handle, ind, pri);
744 GOTO(exit_unlock, err);
746 err = fsfilt_ext3_set_indirect(pri, index, ind->i_ino, parent->i_ino);
748 GOTO(exit_unlock, err);
750 /* XXX for directory, we copy the block back
751 * or ext3_rmdir will report errors "bad dir, no data blocks"
753 if( S_ISDIR(pri->i_mode)) {
754 handle = ext3_copy_data(handle, pri, ind, &has_orphan);
756 GOTO(exit_unlock, err= -EINVAL);
759 EXT3_I(pri)->i_flags |= EXT3_DEL_FL;
760 EXT3_I(ind)->i_flags |= EXT3_COW_FL;
761 if(S_ISREG(pri->i_mode)) pri->i_nlink = 1;
762 EXT3_I(pri)->i_dtime = LTIME_S(CURRENT_TIME);
763 //EXT3_I(pri)->i_generation++;
764 ext3_mark_inode_dirty(handle, pri);
765 ext3_mark_inode_dirty(handle, ind);
769 err = ext3_migrate_data(handle, ind, pri);
773 /* for regular files we do blocklevel COW's maybe */
774 if (EXT3_HAS_COMPAT_FEATURE(pri->i_sb, EXT3_FEATURE_COMPAT_BLOCKCOW)
775 && S_ISREG(pri->i_mode)) {
777 CDEBUG(D_INODE, "ino %lu, do block cow\n", pri->i_ino);
778 /* because after migrate_data , pri->i_size is 0 */
779 pri->i_size = ind->i_size;
782 int bpib = pri->i_sb->s_blocksize >> 9;
783 CDEBUG(D_INODE, "ino %lu, do file cow\n", pri->i_ino);
785 /* XXX: can we do this better?
786 * If it's a fast symlink, we should copy i_data back!
787 * The criteria to determine a fast symlink is:
788 * 1) it's a link and its i_blocks is 0
789 * 2) it's a link and its i_blocks is bpib ( the case
790 * it has been cowed and has ea )
792 if( S_ISLNK(ind->i_mode) && ((ind->i_blocks == 0) ||
793 (ext3_has_ea(ind) && ind->i_blocks == bpib))) {
794 CDEBUG(D_INODE, "ino %lu is fast symlink\n", pri->i_ino);
795 memcpy(EXT3_I(pri)->i_data, EXT3_I(ind)->i_data,
796 sizeof(EXT3_I(ind)->i_data));
797 pri->i_size = ind->i_size;
800 handle = ext3_copy_data(handle, pri, ind, &has_orphan);
802 GOTO(exit_unlock, err);
805 /* set cow flag for ind */
806 EXT3_I(ind)->i_flags |= EXT3_COW_FL;
807 EXT3_I(pri)->i_flags &= ~EXT3_COW_FL;
809 ext3_mark_inode_dirty(handle, pri);
810 ext3_mark_inode_dirty(handle, ind);
812 err = fsfilt_ext3_set_indirect(pri, index, ind->i_ino, parent->i_ino);
814 GOTO(exit_unlock, err);
818 if (!EXT3_HAS_COMPAT_FEATURE(pri->i_sb,
819 EXT3_FEATURE_COMPAT_SNAPFS)) {
820 lock_super(pri->i_sb);
821 ext3_journal_get_write_access(handle, EXT3_SB(pri->i_sb)->s_sbh);
822 EXT3_SB(pri->i_sb)->s_es->s_feature_compat |=
823 cpu_to_le32(EXT3_FEATURE_COMPAT_SNAPFS);
824 ext3_journal_dirty_metadata(handle, EXT3_SB(pri->i_sb)->s_sbh);
825 pri->i_sb->s_dirt = 1;
826 unlock_super(pri->i_sb);
829 CDEBUG(D_INODE, "del %lu nlink %d from orphan list\n",
830 ind->i_ino, ind->i_nlink);
831 ext3_orphan_del(handle, ind);
833 journal_stop(handle);
842 CDEBUG(D_INODE, "del %lu nlink %d from orphan list\n",
843 ind->i_ino, ind->i_nlink);
844 ext3_orphan_del(handle, ind);
847 journal_stop(handle);
849 RETURN(ERR_PTR(err));
852 static int fsfilt_ext3_snap_feature (struct super_block *sb, int feature, int op) {
859 case SNAP_SET_FEATURE:
860 case SNAP_CLEAR_FEATURE:
861 EXT3_JOURNAL_START(sb, handle, 1, rc);
865 ext3_journal_get_write_access(handle, EXT3_SB(sb)->s_sbh);
866 if (op == SNAP_SET_FEATURE)
867 SB_FEATURE_COMPAT(sb) |= cpu_to_le32(feature);
869 SB_FEATURE_COMPAT(sb) &= ~cpu_to_le32(feature);
871 ext3_journal_dirty_metadata(handle, EXT3_SB(sb)->s_sbh);
873 journal_stop(handle);
875 case SNAP_HAS_FEATURE:
876 /*FIXME should lock super or not*/
877 rc = SNAP_HAS_COMPAT_FEATURE(sb, feature);
885 * is_redirector - determines if a primary inode is a redirector
886 * @inode: primary inode to test
888 * Returns 1 if the inode is a redirector, 0 otherwise.
890 static int fsfilt_ext3_is_redirector(struct inode *inode)
892 int is_redirector = 0;
896 rc = ext3_xattr_get(inode, EXT3_SNAP_INDEX ,EXT3_SNAP_ATTR,
898 if (rc > 0 && rc <= MAX_SNAP_DATA)
900 CDEBUG(D_INODE, "inode %lu %s redirector\n", inode->i_ino,
901 is_redirector ? "is" : "isn't");
902 RETURN(is_redirector);
904 /*if it's indirect inode or not */
905 static int fsfilt_ext3_is_indirect(struct inode *inode)
907 if (EXT3_I(inode)->i_flags |= EXT3_COW_FL)
913 /* get the indirect ino at index of the primary inode
914 * return value: postive: indirect ino number
915 * negative or 0: error
917 static ino_t fsfilt_ext3_get_indirect_ino(struct super_block *sb,
918 ino_t primary_ino, int index)
920 char buf[EXT3_MAX_SNAP_DATA];
921 struct inode *primary = NULL;
922 struct snap_ea *snaps;
926 if (index < 0 || index > EXT3_MAX_SNAPS || !primary)
928 primary = iget(sb, primary_ino);
932 CERROR("attribute read error=%d", err);
933 GOTO (err_free, ino = err);
935 err = ext3_xattr_get(primary, EXT3_SNAP_INDEX, EXT3_SNAP_ATTR,
936 buf, EXT3_MAX_SNAP_DATA);
937 if (err == -ENODATA) {
938 GOTO(err_free, ino = -ENODATA);
939 } else if (err < 0) {
940 CERROR(" attribute read error err=%d\n", err);
941 GOTO(err_free, ino = err);
943 snaps = (struct snap_ea *)buf;
944 ino = le32_to_cpu (snaps->ino[index]);
945 CDEBUG(D_INODE, "snap ino for %ld at index %d is %lu\n",
946 primary->i_ino, index, ino);
954 /* The following functions are used by destroy_indirect */
955 #define inode_bmap(inode, nr) (EXT3_I(inode)->i_data[(nr)])
956 #define inode_setbmap(inode, nr, physical) (EXT3_I(inode)->i_data[(nr)]=(physical))
957 static inline int block_bmap(struct buffer_head * bh, int nr)
963 tmp = le32_to_cpu(((u32 *) bh->b_data)[nr]);
968 static inline int block_setbmap(handle_t *handle, struct buffer_head * bh,
969 int nr, int physical)
974 ext3_journal_get_write_access(handle, bh);
975 ((u32 *) bh->b_data)[nr] = cpu_to_le32(physical);
976 ext3_journal_dirty_metadata(handle, bh);
981 static int ext3_migrate_block(handle_t *handle, struct inode * dst,
982 struct inode *src, int block)
984 int i1_d=0, i1_s=0, i2_d=0, i2_s=0, i3_d=0, i3_s=0;
985 int addr_per_block = EXT3_ADDR_PER_BLOCK(src->i_sb);
986 int addr_per_block_bits = EXT3_ADDR_PER_BLOCK_BITS(src->i_sb);
991 CWARN("ext3_migrate_block block < 0 %p \n", src->i_sb);
994 if (block >= EXT3_NDIR_BLOCKS + addr_per_block +
995 (1 << (addr_per_block_bits * 2)) +
996 ((1 << (addr_per_block_bits * 2)) << addr_per_block_bits)) {
997 CWARN("ext3_migrate_block block > big %p \n", src->i_sb);
1000 /* EXT3_NDIR_BLOCK */
1001 if (block < EXT3_NDIR_BLOCKS) {
1002 if(inode_bmap(dst, block))
1005 if( (physical = inode_bmap(src, block)) ) {
1006 inode_setbmap (dst, block, physical);
1007 inode_setbmap (src, block, 0);
1014 /* EXT3_IND_BLOCK */
1015 block -= EXT3_NDIR_BLOCKS;
1016 if (block < addr_per_block) {
1017 i1_d = inode_bmap (dst, EXT3_IND_BLOCK);
1019 physical = inode_bmap(src, EXT3_IND_BLOCK);
1021 inode_setbmap (dst, EXT3_IND_BLOCK, physical);
1022 inode_setbmap (src, EXT3_IND_BLOCK, 0);
1028 if(block_bmap(sb_bread(dst->i_sb, i1_d), block))
1031 i1_s = inode_bmap (src, EXT3_IND_BLOCK);
1032 if( !i1_s) RETURN(0);
1034 physical = block_bmap(sb_bread(src->i_sb, i1_s), block);
1037 block_setbmap(handle, sb_bread(dst->i_sb, i1_d),block,
1039 block_setbmap(handle, sb_bread(src->i_sb, i1_s),block,0);
1045 /* EXT3_DIND_BLOCK */
1046 block -= addr_per_block;
1047 if (block < (1 << (addr_per_block_bits * 2))) {
1048 i1_d = inode_bmap (dst, EXT3_DIND_BLOCK);
1049 i1_s = inode_bmap (src, EXT3_DIND_BLOCK);
1051 if( (physical = inode_bmap(src, EXT3_DIND_BLOCK)) ) {
1052 inode_setbmap (dst, EXT3_DIND_BLOCK, physical);
1053 inode_setbmap (src, EXT3_DIND_BLOCK, 0);
1059 i2_d = block_bmap (sb_bread (dst->i_sb, i1_d),
1060 block >> addr_per_block_bits);
1064 if(!i1_s) RETURN(0);
1066 physical = block_bmap(sb_bread (src->i_sb, i1_s),
1067 block >> addr_per_block_bits);
1069 block_setbmap(handle, sb_bread(dst->i_sb, i1_d),
1070 block >> addr_per_block_bits,
1072 block_setbmap(handle, sb_bread(src->i_sb, i1_s),
1073 block >> addr_per_block_bits, 0);
1079 physical = block_bmap(sb_bread(dst->i_sb, i2_d),
1080 block & (addr_per_block - 1));
1084 i2_s = block_bmap (sb_bread(src->i_sb, i1_s),
1085 block >> addr_per_block_bits);
1086 if(!i2_s) RETURN(0);
1088 physical = block_bmap(sb_bread(src->i_sb, i2_s),
1089 block & (addr_per_block - 1));
1091 block_setbmap(handle, sb_bread(dst->i_sb, i2_d),
1092 block & (addr_per_block - 1), physical);
1093 block_setbmap(handle, sb_bread(src->i_sb, i2_s),
1094 block & (addr_per_block - 1), 0);
1102 /* EXT3_TIND_BLOCK */
1103 block -= (1 << (addr_per_block_bits * 2));
1104 i1_d = inode_bmap (dst, EXT3_TIND_BLOCK);
1105 i1_s = inode_bmap (src, EXT3_TIND_BLOCK);
1107 if((physical = inode_bmap(src, EXT3_TIND_BLOCK)) )
1108 inode_setbmap (dst, EXT3_TIND_BLOCK, physical);
1112 i2_d = block_bmap(sb_bread (dst->i_sb, i1_d),
1113 block >> (addr_per_block_bits * 2));
1115 if(i1_s) i2_s = block_bmap(sb_bread(src->i_sb, i1_s),
1116 block >> (addr_per_block_bits * 2));
1119 if( !i1_s) RETURN(0);
1121 physical = block_bmap(sb_bread (src->i_sb, i1_s),
1122 block >> (addr_per_block_bits * 2));
1124 block_setbmap(handle, sb_bread (dst->i_sb, i1_d),
1125 block >> (addr_per_block_bits * 2), physical);
1126 block_setbmap(handle, sb_bread (src->i_sb, i1_s),
1127 block >> (addr_per_block_bits * 2), 0);
1133 i3_d = block_bmap (sb_bread (dst->i_sb, i2_d),
1134 (block >> addr_per_block_bits) & (addr_per_block - 1));
1135 if( i2_s) i3_s = block_bmap (sb_bread (src->i_sb, i2_s),
1136 (block >> addr_per_block_bits) & (addr_per_block - 1));
1139 if (!i2_s) RETURN(0);
1140 physical = block_bmap (sb_bread (src->i_sb, i2_s),
1141 (block >> addr_per_block_bits) & (addr_per_block - 1));
1143 block_setbmap (handle, sb_bread (dst->i_sb, i2_d),
1144 (block >> addr_per_block_bits) &
1145 (addr_per_block - 1), physical);
1146 block_setbmap (handle, sb_bread (src->i_sb, i2_s),
1147 (block >> addr_per_block_bits) &
1148 (addr_per_block - 1),0);
1154 physical = block_bmap (sb_bread (dst->i_sb, i3_d),
1155 block & (addr_per_block - 1)) ;
1161 physical = block_bmap(sb_bread(src->i_sb, i3_s),
1162 block & (addr_per_block - 1));
1164 block_setbmap (handle, sb_bread (dst->i_sb, i3_d),
1165 block & (addr_per_block - 1), physical);
1166 block_setbmap (handle, sb_bread (src->i_sb, i3_s),
1167 block & (addr_per_block - 1), 0);
1175 /* Generate i_blocks from blocks for an inode .
1176 * We also calculate EA block here.
1178 static unsigned long calculate_i_blocks(struct inode *inode, int blocks)
1180 /* 512 byte disk blocks per inode block */
1181 int bpib = inode->i_sb->s_blocksize >> 9;
1182 int addr_per_block = EXT3_ADDR_PER_BLOCK(inode->i_sb);
1183 unsigned long i_blocks = 0;
1184 int i=0, j=0, meta_blocks = 0;
1190 /* re-calculate blocks here */
1191 blocks = (inode->i_size + inode->i_sb->s_blocksize-1)
1192 >> inode->i_sb->s_blocksize_bits;
1195 /* calculate data blocks */
1196 for(i = 0; i < blocks; i++) {
1197 if(ext3_bmap(inode->i_mapping, i))
1200 /* calculate meta blocks */
1201 blocks -= EXT3_NDIR_BLOCKS;
1204 blocks -= addr_per_block;
1206 if( blocks > 0 ) meta_blocks++;
1209 while( (blocks > 0) && (i < addr_per_block) ) {
1211 blocks -= addr_per_block;
1215 if ( blocks > 0 ) meta_blocks += 2;
1218 while( blocks > 0) {
1220 blocks -= addr_per_block;
1222 if(i >= addr_per_block ) {
1226 if( j >= addr_per_block) {
1231 /* calculate EA blocks */
1232 if(ext3_has_ea(inode))
1235 i_blocks += meta_blocks * bpib;
1236 CDEBUG(D_INODE, "ino %lu, get i_blocks %lu\n", inode->i_ino, i_blocks);
1242 * fsfilt_ext3_destroy_indirect - delete an indirect inode from the table
1243 * @pri: primary inode
1244 * @ind: indirect inode
1245 * @index: index of inode that should be deleted
1247 * We delete the @*ind inode, and remove it from the snapshot table. If @*ind
1248 * is NULL, we use the inode at @index.
1250 static int fsfilt_ext3_destroy_indirect(struct inode *pri, int index,
1251 struct inode *next_ind)
1253 char buf[EXT3_MAX_SNAP_DATA];
1254 struct snap_ea *snaps;
1256 int save = 0, i=0, err = 0;
1257 handle_t *handle=NULL;
1260 if (index < 0 || index > EXT3_MAX_SNAPS)
1263 if( pri == EXT3_SB(pri->i_sb)->s_journal_inode ){
1264 CERROR("TRY TO DESTROY JOURNAL'S IND\n");
1268 err = ext3_xattr_get(pri, EXT3_SNAP_INDEX, EXT3_SNAP_ATTR,
1269 buf, EXT3_MAX_SNAP_DATA);
1271 CERROR("inode %lu attribute read error\n", pri->i_ino);
1275 snaps = (struct snap_ea *)buf;
1276 if ( !snaps->ino[index] ) {
1277 CERROR("for pri ino %lu, index %d, redirect ino is 0\n",
1282 CDEBUG(D_INODE, "for pri ino %lu, reading inode %lu at index %d\n",
1283 pri->i_ino, (ulong)le32_to_cpu(snaps->ino[index]), index);
1285 ind = iget(pri->i_sb, le32_to_cpu (snaps->ino[index]));
1287 if ( !ind || IS_ERR(ind) || is_bad_inode(ind))
1290 CDEBUG(D_INODE, "iget ind %lu, ref count = %d\n",
1291 ind->i_ino, atomic_read(&ind->i_count));
1293 EXT3_JOURNAL_START(pri->i_sb, handle, SNAP_DESTROY_TRANS_BLOCKS, err);
1298 /* if it's block level cow, first copy the blocks back */
1299 if (EXT3_HAS_COMPAT_FEATURE(pri->i_sb, EXT3_FEATURE_COMPAT_BLOCKCOW) &&
1300 S_ISREG(pri->i_mode)) {
1307 double_lock_inode(next_ind, ind);
1309 blocks = (next_ind->i_size + next_ind->i_sb->s_blocksize-1)
1310 >> next_ind->i_sb->s_blocksize_bits;
1312 CDEBUG(D_INODE, "migrate block back from ino %lu to %lu\n",
1313 ind->i_ino, next_ind->i_ino);
1315 for(i = 0; i < blocks; i++) {
1316 if( ext3_bmap(next_ind->i_mapping, i) )
1318 if( !ext3_bmap(ind->i_mapping, i) )
1320 ext3_migrate_block(handle, next_ind, ind, i) ;
1322 /* Now re-compute the i_blocks */
1323 /* XXX shall we take care of ind here? probably not */
1324 next_ind->i_blocks = calculate_i_blocks( next_ind, blocks);
1325 ext3_mark_inode_dirty(handle, next_ind);
1327 if (next_ind == pri)
1330 double_unlock_inode(next_ind, ind);
1333 CDEBUG(D_INODE, "delete indirect ino %lu\n", ind->i_ino);
1334 CDEBUG(D_INODE, "iput ind %lu, ref count = %d\n", ind->i_ino,
1335 atomic_read(&ind->i_count));
1340 snaps->ino[index] = cpu_to_le32(0);
1341 for (i = 0; i < EXT3_MAX_SNAPS; i++)
1342 save += snaps->ino[i];
1345 /*Should we remove snap feature here*/
1347 * If we are deleting the last indirect inode, and the primary inode
1348 * has already been deleted, then mark the primary for deletion also.
1349 * Otherwise, if we are deleting the last indirect inode remove the
1350 * snaptable from the inode. XXX
1352 if (!save && EXT3_I(pri)->i_dtime) {
1353 CDEBUG(D_INODE, "deleting primary %lu\n", pri->i_ino);
1355 /* reset err to 0 now */
1358 CDEBUG(D_INODE, "%s redirector table\n",
1359 save ? "saving" : "deleting");
1360 err = ext3_xattr_set_handle(handle, pri, EXT3_SNAP_INDEX,
1361 EXT3_SNAP_ATTR, save ? buf : NULL,
1362 EXT3_MAX_SNAP_DATA, 0);
1363 ext3_mark_inode_dirty(handle, pri);
1365 journal_stop(handle);
1370 /* restore a primary inode with the indirect inode at index */
1371 static int fsfilt_ext3_restore_indirect(struct inode *pri, int index)
1375 handle_t *handle = NULL;
1378 if (index < 0 || index > EXT3_MAX_SNAPS)
1381 if( pri == EXT3_SB(pri->i_sb)->s_journal_inode ){
1382 CERROR("TRY TO RESTORE JOURNAL\n");
1385 CDEBUG(D_INODE, "pri ino %lu, index %d\n", pri->i_ino, index);
1387 ind = fsfilt_ext3_get_indirect(pri, NULL, index);
1392 CDEBUG(D_INODE, "restore ino %lu to %lu\n", pri->i_ino, ind->i_ino);
1394 EXT3_JOURNAL_START(pri->i_sb, handle, SNAP_RESTORE_TRANS_BLOCKS, err);
1397 /* first destroy all the data blocks in primary inode */
1398 /* XXX: check this, ext3_new_inode, the first arg should be "dir" */
1399 err = ext3_throw_inode_data(handle, pri);
1401 CERROR("restore_indirect, new_inode err\n");
1404 double_lock_inode(pri, ind);
1405 ext3_migrate_data(handle, pri, ind);
1406 EXT3_I(pri)->i_flags &= ~EXT3_COW_FL;
1407 ext3_mark_inode_dirty(handle, pri);
1408 double_unlock_inode(pri, ind);
1411 //fsfilt_ext3_destroy_indirect(pri, index);
1412 journal_stop(handle);
1418 * ext3_snap_iterate - iterate through all of the inodes
1419 * @sb: filesystem superblock
1420 * @repeat: pointer to function called on each valid inode
1421 * @start: inode to start iterating at
1422 * @priv: private data to the caller/repeat function
1424 * If @start is NULL, then we do not return an inode pointer. If @*start is
1425 * NULL, then we start at the beginning of the filesystem, and iterate over
1426 * all of the inodes in the system. If @*start is non-NULL, then we start
1427 * iterating at this inode.
1429 * We call the repeat function for each inode that is in use. The repeat
1430 * function must check if this is a redirector (with is_redirector) if it
1431 * only wants to operate on redirector inodes. If there is an error or
1432 * the repeat function returns non-zero, we return the last inode operated
1433 * on in the @*start parameter. This allows the caller to restart the
1434 * iteration at this inode if desired, by returning a positive value.
1435 * Negative return values indicate an error.
1437 * NOTE we cannot simply traverse the existing filesystem tree from the root
1438 * inode, as there may be disconnected trees from deleted files/dirs
1440 * FIXME If there was a list of inodes with EAs, we could simply walk the list
1441 * intead of reading every inode. This is an internal implementation issue.
1444 static int ext3_iterate_all(struct super_block *sb,
1445 int (*repeat)(struct inode *inode,void *priv),
1446 struct inode **start, void *priv)
1448 struct inode *tmp = NULL;
1449 int gstart, gnum, err = 0;
1450 ino_t istart, ibase;
1456 *start = iget(sb, EXT3_ROOT_INO);
1458 GOTO(exit, err = -ENOMEM);
1460 if (is_bad_inode(*start))
1461 GOTO(exit, err = -EIO);
1463 if ((*start)->i_ino > le32_to_cpu(EXT3_SB(sb)->s_es->s_inodes_count)) {
1464 CERROR("invalid starting inode %ld\n",(*start)->i_ino);
1465 GOTO(exit, err = -EINVAL);
1467 if ((*start)->i_ino < EXT3_FIRST_INO(sb)) {
1468 if ((err = (*repeat)(*start, priv) != 0))
1471 *start = iget(sb, EXT3_FIRST_INO(sb));
1473 GOTO(exit, err = -ENOMEM);
1474 if (is_bad_inode(*start))
1475 GOTO(exit, err = -EIO);
1478 gstart = ((*start)->i_ino - 1) / EXT3_INODES_PER_GROUP(sb);
1479 istart = ((*start)->i_ino - 1) % EXT3_INODES_PER_GROUP(sb);
1480 ibase = gstart * EXT3_INODES_PER_GROUP(sb);
1481 for (gnum = gstart; gnum < EXT3_SB(sb)->s_groups_count;
1482 gnum++, ibase += EXT3_INODES_PER_GROUP(sb)) {
1483 struct buffer_head *bitmap_bh = NULL;
1484 struct ext3_group_desc * gdp;
1487 gdp = ext3_get_group_desc (sb, gnum, NULL);
1488 if (!gdp || le16_to_cpu(gdp->bg_free_inodes_count) ==
1489 EXT3_INODES_PER_GROUP(sb))
1491 bitmap_bh = read_inode_bitmap(sb, gnum);
1497 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
1498 ino = find_next_bit((unsigned long *)bitmap_bh->b_data,
1499 EXT3_INODES_PER_GROUP(sb), ino);
1501 ino = find_next_bit((unsigned long *)bitmap_bh->b_data,
1502 EXT3_INODES_PER_GROUP(sb), ino);
1503 #warning"FIXME-WANGDI need to port find_next_bit to 2.4"
1505 if (ino < EXT3_INODES_PER_GROUP(sb)) {
1506 ino_t inum = ino + gnum * EXT3_INODES_PER_GROUP(sb) + 1;
1508 if (inum < (*start)->i_ino)
1511 *start = iget(sb, inum);
1513 GOTO(exit, err = -ENOMEM);
1514 if (is_bad_inode(*start))
1515 GOTO(exit, err = -EIO);
1517 if ((err = (*repeat)(*start, priv)) != 0)
1521 if (++ino < EXT3_INODES_PER_GROUP(sb))
1531 static int fsfilt_ext3_iterate(struct super_block *sb,
1532 int (*repeat)(struct inode *inode, void *priv),
1533 struct inode **start, void *priv, int flag)
1536 case SNAP_ITERATE_ALL_INODE:
1537 return ext3_iterate_all (sb, repeat, start, priv);
1543 static int fsfilt_ext3_get_snap_info(struct inode *inode, void *key,
1544 __u32 keylen, void *val,
1550 if (!vallen || !val) {
1551 CERROR("val and val_size is 0!\n");
1554 if (keylen >= strlen(MAX_SNAPTABLE_COUNT)
1555 && strcmp(key, MAX_SNAPTABLE_COUNT) == 0) {
1556 /*FIXME should get it from the EA_size*/
1557 *((__u32 *)val) = EXT3_MAX_SNAPS;
1558 *vallen = sizeof(int);
1560 } else if (keylen >= strlen(SNAPTABLE_INFO)
1561 && strcmp(key, SNAPTABLE_INFO) == 0) {
1562 rc = ext3_xattr_get(inode, EXT3_SNAP_INDEX,
1563 EXT3_SNAPTABLE_EA, val, *vallen);
1565 } else if (keylen >= strlen(SNAP_GENERATION)
1566 && strcmp(key, SNAP_GENERATION) == 0) {
1568 rc = ext3_xattr_get(inode, EXT3_SNAP_INDEX,EXT3_SNAP_GENERATION,
1569 (char *)val, *vallen);
1570 if (rc == -ENODATA) {
1571 *((__u32 *)val) = 0;
1572 *vallen = sizeof(int);
1580 static int fsfilt_ext3_set_snap_info(struct inode *inode, void *key,
1581 __u32 keylen, void *val,
1587 if (!vallen || !val) {
1588 CERROR("val and val_size is 0!\n");
1592 if (keylen >= strlen(SNAPTABLE_INFO)
1593 && strcmp(key, SNAPTABLE_INFO) == 0) {
1595 EXT3_JOURNAL_START(inode->i_sb, handle,
1596 EXT3_XATTR_TRANS_BLOCKS, rc);
1599 rc = ext3_xattr_set_handle(handle, inode, EXT3_SNAP_INDEX,
1600 EXT3_SNAPTABLE_EA, val, *vallen, 0);
1601 journal_stop(handle);
1604 } else if (keylen >= strlen(SNAP_GENERATION)
1605 && strcmp(key, SNAP_GENERATION) == 0) {
1607 rc = ext3_set_generation(inode, *(int*)val);
1613 static int fsfilt_ext3_dir_ent_size(char *name)
1616 return EXT3_DIR_REC_LEN(strlen(name));
1621 static int fsfilt_ext3_set_dir_ent(struct super_block *sb, char *name,
1622 char *buf, int buf_off, int nlen, size_t count)
1626 if (buf_off == 0 && nlen == 0) {
1627 struct ext3_dir_entry_2 *de = (struct ext3_dir_entry_2 *)buf;
1628 LASSERT(count == PAGE_CACHE_SIZE);
1629 de->rec_len = count;
1633 struct ext3_dir_entry_2 *de, *de1;
1634 de = (struct ext3_dir_entry_2 *)(buf + buf_off - nlen);
1635 de1 = (struct ext3_dir_entry_2 *)(buf + buf_off);
1638 LASSERT(nlen == EXT3_DIR_REC_LEN_DE(de));
1640 rlen = le16_to_cpu(de->rec_len);
1641 de->rec_len = cpu_to_le16(nlen);
1643 de1->rec_len = cpu_to_le16(rlen - nlen);
1644 de1->name_len = strlen(name);
1645 memcpy (de1->name, name, de->name_len);
1646 nlen = EXT3_DIR_REC_LEN_DE(de1);
1651 struct fsfilt_operations fsfilt_ext3_snap_ops = {
1652 .fs_type = "ext3_snap",
1653 .fs_owner = THIS_MODULE,
1654 .fs_create_indirect = fsfilt_ext3_create_indirect,
1655 .fs_get_indirect = fsfilt_ext3_get_indirect,
1656 .fs_set_indirect = fsfilt_ext3_set_indirect,
1657 .fs_snap_feature = fsfilt_ext3_snap_feature,
1658 .fs_is_redirector = fsfilt_ext3_is_redirector,
1659 .fs_is_indirect = fsfilt_ext3_is_indirect,
1660 .fs_get_indirect_ino = fsfilt_ext3_get_indirect_ino,
1661 .fs_destroy_indirect = fsfilt_ext3_destroy_indirect,
1662 .fs_restore_indirect = fsfilt_ext3_restore_indirect,
1663 .fs_iterate = fsfilt_ext3_iterate,
1664 .fs_copy_block = fsfilt_ext3_copy_block,
1665 .fs_set_snap_info = fsfilt_ext3_set_snap_info,
1666 .fs_get_snap_info = fsfilt_ext3_get_snap_info,
1667 .fs_dir_ent_size = fsfilt_ext3_dir_ent_size,
1668 .fs_set_dir_ent = fsfilt_ext3_set_dir_ent,
1672 static int __init fsfilt_ext3_snap_init(void)
1676 rc = fsfilt_register_ops(&fsfilt_ext3_snap_ops);
1681 static void __exit fsfilt_ext3_snap_exit(void)
1684 fsfilt_unregister_ops(&fsfilt_ext3_snap_ops);
1687 module_init(fsfilt_ext3_snap_init);
1688 module_exit(fsfilt_ext3_snap_exit);
1690 MODULE_AUTHOR("Cluster File Systems, Inc. <info@clusterfs.com>");
1691 MODULE_DESCRIPTION("Lustre ext3 Filesystem Helper v0.1");
1692 MODULE_LICENSE("GPL");