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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * Copyright 2000 by Hans Reiser, licensing governed by reiserfs/README
3 */
4
Linus Torvalds1da177e2005-04-16 15:20:36 -07005#include <linux/time.h>
6#include <linux/fs.h>
7#include <linux/reiserfs_fs.h>
8#include <linux/reiserfs_acl.h>
9#include <linux/reiserfs_xattr.h>
Christoph Hellwiga5694252007-07-17 04:04:28 -070010#include <linux/exportfs.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070011#include <linux/smp_lock.h>
12#include <linux/pagemap.h>
13#include <linux/highmem.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090014#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070015#include <asm/uaccess.h>
16#include <asm/unaligned.h>
17#include <linux/buffer_head.h>
18#include <linux/mpage.h>
19#include <linux/writeback.h>
20#include <linux/quotaops.h>
Vladimir Savelievba9d8ce2007-10-16 01:25:14 -070021#include <linux/swap.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070022
Vladimir Savelievba9d8ce2007-10-16 01:25:14 -070023int reiserfs_commit_write(struct file *f, struct page *page,
24 unsigned from, unsigned to);
25int reiserfs_prepare_write(struct file *f, struct page *page,
26 unsigned from, unsigned to);
Linus Torvalds1da177e2005-04-16 15:20:36 -070027
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070028void reiserfs_delete_inode(struct inode *inode)
Linus Torvalds1da177e2005-04-16 15:20:36 -070029{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070030 /* We need blocks for transaction + (user+group) quota update (possibly delete) */
31 int jbegin_count =
32 JOURNAL_PER_BALANCE_CNT * 2 +
33 2 * REISERFS_QUOTA_INIT_BLOCKS(inode->i_sb);
34 struct reiserfs_transaction_handle th;
Frederic Weisbeckercb1c2e52009-12-13 23:32:06 +010035 int depth;
Jeff Mahoney24996042005-12-14 14:38:05 -050036 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -070037
Christoph Hellwig907f4552010-03-03 09:05:06 -050038 if (!is_bad_inode(inode))
Christoph Hellwig871a2932010-03-03 09:05:07 -050039 dquot_initialize(inode);
Christoph Hellwig907f4552010-03-03 09:05:06 -050040
Mark Fashehfef26652005-09-09 13:01:31 -070041 truncate_inode_pages(&inode->i_data, 0);
42
Frederic Weisbeckercb1c2e52009-12-13 23:32:06 +010043 depth = reiserfs_write_lock_once(inode->i_sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -070044
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070045 /* The = 0 happens when we abort creating a new inode for some reason like lack of space.. */
46 if (!(inode->i_state & I_NEW) && INODE_PKEY(inode)->k_objectid != 0) { /* also handles bad_inode case */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070047 reiserfs_delete_xattrs(inode);
48
Alexander Zarochentsevb0b33de2006-08-05 12:14:01 -070049 if (journal_begin(&th, inode->i_sb, jbegin_count))
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070050 goto out;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070051 reiserfs_update_inode_transaction(inode);
52
Jeff Mahoneyeb35c212008-07-08 14:37:06 -040053 reiserfs_discard_prealloc(&th, inode);
54
Jeff Mahoney24996042005-12-14 14:38:05 -050055 err = reiserfs_delete_object(&th, inode);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070056
57 /* Do quota update inside a transaction for journaled quotas. We must do that
58 * after delete_object so that quota updates go into the same transaction as
59 * stat data deletion */
Jeff Mahoney24996042005-12-14 14:38:05 -050060 if (!err)
Christoph Hellwig63936dd2010-03-03 09:05:01 -050061 dquot_free_inode(inode);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070062
Alexander Zarochentsevb0b33de2006-08-05 12:14:01 -070063 if (journal_end(&th, inode->i_sb, jbegin_count))
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070064 goto out;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070065
Jeff Mahoney24996042005-12-14 14:38:05 -050066 /* check return value from reiserfs_delete_object after
67 * ending the transaction
68 */
69 if (err)
70 goto out;
71
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070072 /* all items of file are deleted, so we can remove "save" link */
73 remove_save_link(inode, 0 /* not truncate */ ); /* we can't do anything
74 * about an error here */
75 } else {
76 /* no object items are in the tree */
77 ;
Linus Torvalds1da177e2005-04-16 15:20:36 -070078 }
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070079 out:
80 clear_inode(inode); /* note this must go after the journal_end to prevent deadlock */
81 inode->i_blocks = 0;
Frederic Weisbeckercb1c2e52009-12-13 23:32:06 +010082 reiserfs_write_unlock_once(inode->i_sb, depth);
Linus Torvalds1da177e2005-04-16 15:20:36 -070083}
84
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070085static void _make_cpu_key(struct cpu_key *key, int version, __u32 dirid,
86 __u32 objectid, loff_t offset, int type, int length)
Linus Torvalds1da177e2005-04-16 15:20:36 -070087{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070088 key->version = version;
Linus Torvalds1da177e2005-04-16 15:20:36 -070089
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070090 key->on_disk_key.k_dir_id = dirid;
91 key->on_disk_key.k_objectid = objectid;
92 set_cpu_key_k_offset(key, offset);
93 set_cpu_key_k_type(key, type);
94 key->key_length = length;
Linus Torvalds1da177e2005-04-16 15:20:36 -070095}
96
Linus Torvalds1da177e2005-04-16 15:20:36 -070097/* take base of inode_key (it comes from inode always) (dirid, objectid) and version from an inode, set
98 offset and type of key */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070099void make_cpu_key(struct cpu_key *key, struct inode *inode, loff_t offset,
100 int type, int length)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700102 _make_cpu_key(key, get_inode_item_key_version(inode),
103 le32_to_cpu(INODE_PKEY(inode)->k_dir_id),
104 le32_to_cpu(INODE_PKEY(inode)->k_objectid), offset, type,
105 length);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700106}
107
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108//
109// when key is 0, do not set version and short key
110//
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700111inline void make_le_item_head(struct item_head *ih, const struct cpu_key *key,
112 int version,
113 loff_t offset, int type, int length,
114 int entry_count /*or ih_free_space */ )
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700116 if (key) {
117 ih->ih_key.k_dir_id = cpu_to_le32(key->on_disk_key.k_dir_id);
118 ih->ih_key.k_objectid =
119 cpu_to_le32(key->on_disk_key.k_objectid);
120 }
121 put_ih_version(ih, version);
122 set_le_ih_k_offset(ih, offset);
123 set_le_ih_k_type(ih, type);
124 put_ih_item_len(ih, length);
125 /* set_ih_free_space (ih, 0); */
126 // for directory items it is entry count, for directs and stat
127 // datas - 0xffff, for indirects - 0
128 put_ih_entry_count(ih, entry_count);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129}
130
131//
132// FIXME: we might cache recently accessed indirect item
133
134// Ugh. Not too eager for that....
135// I cut the code until such time as I see a convincing argument (benchmark).
136// I don't want a bloated inode struct..., and I don't like code complexity....
137
138/* cutting the code is fine, since it really isn't in use yet and is easy
139** to add back in. But, Vladimir has a really good idea here. Think
140** about what happens for reading a file. For each page,
141** The VFS layer calls reiserfs_readpage, who searches the tree to find
142** an indirect item. This indirect item has X number of pointers, where
143** X is a big number if we've done the block allocation right. But,
144** we only use one or two of these pointers during each call to readpage,
145** needlessly researching again later on.
146**
147** The size of the cache could be dynamic based on the size of the file.
148**
149** I'd also like to see us cache the location the stat data item, since
150** we are needlessly researching for that frequently.
151**
152** --chris
153*/
154
155/* If this page has a file tail in it, and
156** it was read in by get_block_create_0, the page data is valid,
157** but tail is still sitting in a direct item, and we can't write to
158** it. So, look through this page, and check all the mapped buffers
159** to make sure they have valid block numbers. Any that don't need
160** to be unmapped, so that block_prepare_write will correctly call
161** reiserfs_get_block to convert the tail into an unformatted node
162*/
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700163static inline void fix_tail_page_for_writing(struct page *page)
164{
165 struct buffer_head *head, *next, *bh;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700166
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700167 if (page && page_has_buffers(page)) {
168 head = page_buffers(page);
169 bh = head;
170 do {
171 next = bh->b_this_page;
172 if (buffer_mapped(bh) && bh->b_blocknr == 0) {
173 reiserfs_unmap_buffer(bh);
174 }
175 bh = next;
176 } while (bh != head);
177 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700178}
179
180/* reiserfs_get_block does not need to allocate a block only if it has been
181 done already or non-hole position has been found in the indirect item */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700182static inline int allocation_needed(int retval, b_blocknr_t allocated,
183 struct item_head *ih,
184 __le32 * item, int pos_in_item)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700185{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700186 if (allocated)
187 return 0;
188 if (retval == POSITION_FOUND && is_indirect_le_ih(ih) &&
189 get_block_num(item, pos_in_item))
190 return 0;
191 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192}
193
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700194static inline int indirect_item_found(int retval, struct item_head *ih)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700196 return (retval == POSITION_FOUND) && is_indirect_le_ih(ih);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700197}
198
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700199static inline void set_block_dev_mapped(struct buffer_head *bh,
200 b_blocknr_t block, struct inode *inode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700201{
202 map_bh(bh, inode->i_sb, block);
203}
204
Linus Torvalds1da177e2005-04-16 15:20:36 -0700205//
206// files which were created in the earlier version can not be longer,
207// than 2 gb
208//
Jeff Mahoney3ee16672007-10-18 23:39:25 -0700209static int file_capable(struct inode *inode, sector_t block)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700210{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700211 if (get_inode_item_key_version(inode) != KEY_FORMAT_3_5 || // it is new file.
212 block < (1 << (31 - inode->i_sb->s_blocksize_bits))) // old file, but 'block' is inside of 2gb
213 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700215 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700216}
217
Adrian Bunkdeba0f42007-10-16 23:26:03 -0700218static int restart_transaction(struct reiserfs_transaction_handle *th,
219 struct inode *inode, struct treepath *path)
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700220{
221 struct super_block *s = th->t_super;
222 int len = th->t_blocks_allocated;
223 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700224
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700225 BUG_ON(!th->t_trans_id);
226 BUG_ON(!th->t_refcount);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700227
Suzuki K P87b41262006-12-06 20:36:10 -0800228 pathrelse(path);
229
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700230 /* we cannot restart while nested */
231 if (th->t_refcount > 1) {
232 return 0;
233 }
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700234 reiserfs_update_sd(th, inode);
235 err = journal_end(th, s, len);
236 if (!err) {
237 err = journal_begin(th, s, JOURNAL_PER_BALANCE_CNT * 6);
238 if (!err)
239 reiserfs_update_inode_transaction(inode);
240 }
241 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700242}
243
244// it is called by get_block when create == 0. Returns block number
245// for 'block'-th logical block of file. When it hits direct item it
246// returns 0 (being called from bmap) or read direct item into piece
247// of page (bh_result)
248
249// Please improve the english/clarity in the comment above, as it is
250// hard to understand.
251
Jeff Mahoney3ee16672007-10-18 23:39:25 -0700252static int _get_block_create_0(struct inode *inode, sector_t block,
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700253 struct buffer_head *bh_result, int args)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700254{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700255 INITIALIZE_PATH(path);
256 struct cpu_key key;
257 struct buffer_head *bh;
258 struct item_head *ih, tmp_ih;
Jeff Mahoney3ee16672007-10-18 23:39:25 -0700259 b_blocknr_t blocknr;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700260 char *p = NULL;
261 int chars;
262 int ret;
263 int result;
264 int done = 0;
265 unsigned long offset;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700266
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700267 // prepare the key to look for the 'block'-th block of file
268 make_cpu_key(&key, inode,
269 (loff_t) block * inode->i_sb->s_blocksize + 1, TYPE_ANY,
270 3);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700271
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700272 result = search_for_position_by_key(inode->i_sb, &key, &path);
273 if (result != POSITION_FOUND) {
274 pathrelse(&path);
275 if (p)
276 kunmap(bh_result->b_page);
277 if (result == IO_ERROR)
278 return -EIO;
279 // We do not return -ENOENT if there is a hole but page is uptodate, because it means
280 // That there is some MMAPED data associated with it that is yet to be written to disk.
281 if ((args & GET_BLOCK_NO_HOLE)
282 && !PageUptodate(bh_result->b_page)) {
283 return -ENOENT;
284 }
285 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700286 }
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700287 //
288 bh = get_last_bh(&path);
289 ih = get_ih(&path);
290 if (is_indirect_le_ih(ih)) {
291 __le32 *ind_item = (__le32 *) B_I_PITEM(bh, ih);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700292
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700293 /* FIXME: here we could cache indirect item or part of it in
294 the inode to avoid search_by_key in case of subsequent
295 access to file */
296 blocknr = get_block_num(ind_item, path.pos_in_item);
297 ret = 0;
298 if (blocknr) {
299 map_bh(bh_result, inode->i_sb, blocknr);
300 if (path.pos_in_item ==
301 ((ih_item_len(ih) / UNFM_P_SIZE) - 1)) {
302 set_buffer_boundary(bh_result);
303 }
304 } else
305 // We do not return -ENOENT if there is a hole but page is uptodate, because it means
306 // That there is some MMAPED data associated with it that is yet to be written to disk.
307 if ((args & GET_BLOCK_NO_HOLE)
308 && !PageUptodate(bh_result->b_page)) {
309 ret = -ENOENT;
310 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700311
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700312 pathrelse(&path);
313 if (p)
314 kunmap(bh_result->b_page);
315 return ret;
316 }
317 // requested data are in direct item(s)
318 if (!(args & GET_BLOCK_READ_DIRECT)) {
319 // we are called by bmap. FIXME: we can not map block of file
320 // when it is stored in direct item(s)
321 pathrelse(&path);
322 if (p)
323 kunmap(bh_result->b_page);
324 return -ENOENT;
325 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700327 /* if we've got a direct item, and the buffer or page was uptodate,
328 ** we don't want to pull data off disk again. skip to the
329 ** end, where we map the buffer and return
330 */
331 if (buffer_uptodate(bh_result)) {
332 goto finished;
333 } else
334 /*
335 ** grab_tail_page can trigger calls to reiserfs_get_block on up to date
336 ** pages without any buffers. If the page is up to date, we don't want
337 ** read old data off disk. Set the up to date bit on the buffer instead
338 ** and jump to the end
339 */
340 if (!bh_result->b_page || PageUptodate(bh_result->b_page)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700341 set_buffer_uptodate(bh_result);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700342 goto finished;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700343 }
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700344 // read file tail into part of page
345 offset = (cpu_key_k_offset(&key) - 1) & (PAGE_CACHE_SIZE - 1);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700346 copy_item_head(&tmp_ih, ih);
347
348 /* we only want to kmap if we are reading the tail into the page.
349 ** this is not the common case, so we don't kmap until we are
350 ** sure we need to. But, this means the item might move if
351 ** kmap schedules
352 */
Frederic Weisbecker27b3a5c2009-10-14 23:34:31 +0200353 if (!p)
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700354 p = (char *)kmap(bh_result->b_page);
Frederic Weisbecker27b3a5c2009-10-14 23:34:31 +0200355
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700356 p += offset;
357 memset(p, 0, inode->i_sb->s_blocksize);
358 do {
359 if (!is_direct_le_ih(ih)) {
360 BUG();
361 }
362 /* make sure we don't read more bytes than actually exist in
363 ** the file. This can happen in odd cases where i_size isn't
Jeff Mahoney0222e652009-03-30 14:02:44 -0400364 ** correct, and when direct item padding results in a few
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700365 ** extra bytes at the end of the direct item
366 */
367 if ((le_ih_k_offset(ih) + path.pos_in_item) > inode->i_size)
368 break;
369 if ((le_ih_k_offset(ih) - 1 + ih_item_len(ih)) > inode->i_size) {
370 chars =
371 inode->i_size - (le_ih_k_offset(ih) - 1) -
372 path.pos_in_item;
373 done = 1;
374 } else {
375 chars = ih_item_len(ih) - path.pos_in_item;
376 }
377 memcpy(p, B_I_PITEM(bh, ih) + path.pos_in_item, chars);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700378
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700379 if (done)
380 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700381
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700382 p += chars;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700383
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700384 if (PATH_LAST_POSITION(&path) != (B_NR_ITEMS(bh) - 1))
385 // we done, if read direct item is not the last item of
386 // node FIXME: we could try to check right delimiting key
387 // to see whether direct item continues in the right
388 // neighbor or rely on i_size
389 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700390
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700391 // update key to look for the next piece
392 set_cpu_key_k_offset(&key, cpu_key_k_offset(&key) + chars);
393 result = search_for_position_by_key(inode->i_sb, &key, &path);
394 if (result != POSITION_FOUND)
395 // i/o error most likely
396 break;
397 bh = get_last_bh(&path);
398 ih = get_ih(&path);
399 } while (1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700400
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700401 flush_dcache_page(bh_result->b_page);
402 kunmap(bh_result->b_page);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700403
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700404 finished:
405 pathrelse(&path);
Qu Fuping6283d582005-06-25 14:55:44 -0700406
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700407 if (result == IO_ERROR)
408 return -EIO;
Qu Fuping6283d582005-06-25 14:55:44 -0700409
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700410 /* this buffer has valid data, but isn't valid for io. mapping it to
411 * block #0 tells the rest of reiserfs it just has a tail in it
412 */
413 map_bh(bh_result, inode->i_sb, 0);
414 set_buffer_uptodate(bh_result);
415 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700416}
417
Linus Torvalds1da177e2005-04-16 15:20:36 -0700418// this is called to create file map. So, _get_block_create_0 will not
419// read direct item
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700420static int reiserfs_bmap(struct inode *inode, sector_t block,
421 struct buffer_head *bh_result, int create)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700422{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700423 if (!file_capable(inode, block))
424 return -EFBIG;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700425
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700426 reiserfs_write_lock(inode->i_sb);
427 /* do not read the direct item */
428 _get_block_create_0(inode, block, bh_result, 0);
429 reiserfs_write_unlock(inode->i_sb);
430 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700431}
432
433/* special version of get_block that is only used by grab_tail_page right
434** now. It is sent to block_prepare_write, and when you try to get a
435** block past the end of the file (or a block from a hole) it returns
436** -ENOENT instead of a valid buffer. block_prepare_write expects to
437** be able to do i/o on the buffers returned, unless an error value
438** is also returned.
Jeff Mahoney0222e652009-03-30 14:02:44 -0400439**
Linus Torvalds1da177e2005-04-16 15:20:36 -0700440** So, this allows block_prepare_write to be used for reading a single block
441** in a page. Where it does not produce a valid page for holes, or past the
442** end of the file. This turns out to be exactly what we need for reading
443** tails for conversion.
444**
445** The point of the wrapper is forcing a certain value for create, even
Jeff Mahoney0222e652009-03-30 14:02:44 -0400446** though the VFS layer is calling this function with create==1. If you
447** don't want to send create == GET_BLOCK_NO_HOLE to reiserfs_get_block,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700448** don't use this function.
449*/
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700450static int reiserfs_get_block_create_0(struct inode *inode, sector_t block,
451 struct buffer_head *bh_result,
452 int create)
453{
454 return reiserfs_get_block(inode, block, bh_result, GET_BLOCK_NO_HOLE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700455}
456
457/* This is special helper for reiserfs_get_block in case we are executing
458 direct_IO request. */
459static int reiserfs_get_blocks_direct_io(struct inode *inode,
460 sector_t iblock,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700461 struct buffer_head *bh_result,
462 int create)
463{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700464 int ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700465
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700466 bh_result->b_page = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700467
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700468 /* We set the b_size before reiserfs_get_block call since it is
469 referenced in convert_tail_for_hole() that may be called from
470 reiserfs_get_block() */
471 bh_result->b_size = (1 << inode->i_blkbits);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700472
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700473 ret = reiserfs_get_block(inode, iblock, bh_result,
474 create | GET_BLOCK_NO_DANGLE);
475 if (ret)
476 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700477
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700478 /* don't allow direct io onto tail pages */
479 if (buffer_mapped(bh_result) && bh_result->b_blocknr == 0) {
480 /* make sure future calls to the direct io funcs for this offset
481 ** in the file fail by unmapping the buffer
482 */
483 clear_buffer_mapped(bh_result);
484 ret = -EINVAL;
485 }
486 /* Possible unpacked tail. Flush the data before pages have
487 disappeared */
488 if (REISERFS_I(inode)->i_flags & i_pack_on_close_mask) {
489 int err;
Frederic Weisbecker8ebc4232009-04-07 04:19:49 +0200490
491 reiserfs_write_lock(inode->i_sb);
492
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700493 err = reiserfs_commit_for_inode(inode);
494 REISERFS_I(inode)->i_flags &= ~i_pack_on_close_mask;
Frederic Weisbecker8ebc4232009-04-07 04:19:49 +0200495
496 reiserfs_write_unlock(inode->i_sb);
497
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700498 if (err < 0)
499 ret = err;
500 }
501 out:
502 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700503}
504
Linus Torvalds1da177e2005-04-16 15:20:36 -0700505/*
506** helper function for when reiserfs_get_block is called for a hole
507** but the file tail is still in a direct item
508** bh_result is the buffer head for the hole
509** tail_offset is the offset of the start of the tail in the file
510**
511** This calls prepare_write, which will start a new transaction
512** you should not be in a transaction, or have any paths held when you
513** call this.
514*/
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700515static int convert_tail_for_hole(struct inode *inode,
516 struct buffer_head *bh_result,
517 loff_t tail_offset)
518{
519 unsigned long index;
520 unsigned long tail_end;
521 unsigned long tail_start;
522 struct page *tail_page;
523 struct page *hole_page = bh_result->b_page;
524 int retval = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700525
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700526 if ((tail_offset & (bh_result->b_size - 1)) != 1)
527 return -EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700528
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700529 /* always try to read until the end of the block */
530 tail_start = tail_offset & (PAGE_CACHE_SIZE - 1);
531 tail_end = (tail_start | (bh_result->b_size - 1)) + 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700532
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700533 index = tail_offset >> PAGE_CACHE_SHIFT;
534 /* hole_page can be zero in case of direct_io, we are sure
535 that we cannot get here if we write with O_DIRECT into
536 tail page */
537 if (!hole_page || index != hole_page->index) {
538 tail_page = grab_cache_page(inode->i_mapping, index);
539 retval = -ENOMEM;
540 if (!tail_page) {
541 goto out;
542 }
543 } else {
544 tail_page = hole_page;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700545 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700546
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700547 /* we don't have to make sure the conversion did not happen while
548 ** we were locking the page because anyone that could convert
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800549 ** must first take i_mutex.
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700550 **
551 ** We must fix the tail page for writing because it might have buffers
552 ** that are mapped, but have a block number of 0. This indicates tail
553 ** data that has been read directly into the page, and block_prepare_write
554 ** won't trigger a get_block in this case.
555 */
556 fix_tail_page_for_writing(tail_page);
557 retval = reiserfs_prepare_write(NULL, tail_page, tail_start, tail_end);
558 if (retval)
559 goto unlock;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700560
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700561 /* tail conversion might change the data in the page */
562 flush_dcache_page(tail_page);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700563
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700564 retval = reiserfs_commit_write(NULL, tail_page, tail_start, tail_end);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700565
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700566 unlock:
567 if (tail_page != hole_page) {
568 unlock_page(tail_page);
569 page_cache_release(tail_page);
570 }
571 out:
572 return retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700573}
574
575static inline int _allocate_block(struct reiserfs_transaction_handle *th,
Jeff Mahoney3ee16672007-10-18 23:39:25 -0700576 sector_t block,
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700577 struct inode *inode,
578 b_blocknr_t * allocated_block_nr,
Josef "Jeff" Sipekfec6d052006-12-08 02:36:32 -0800579 struct treepath *path, int flags)
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700580{
581 BUG_ON(!th->t_trans_id);
582
Linus Torvalds1da177e2005-04-16 15:20:36 -0700583#ifdef REISERFS_PREALLOCATE
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800584 if (!(flags & GET_BLOCK_NO_IMUX)) {
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700585 return reiserfs_new_unf_blocknrs2(th, inode, allocated_block_nr,
586 path, block);
587 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700588#endif
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700589 return reiserfs_new_unf_blocknrs(th, inode, allocated_block_nr, path,
590 block);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700591}
592
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700593int reiserfs_get_block(struct inode *inode, sector_t block,
594 struct buffer_head *bh_result, int create)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700595{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700596 int repeat, retval = 0;
597 b_blocknr_t allocated_block_nr = 0; // b_blocknr_t is (unsigned) 32 bit int
598 INITIALIZE_PATH(path);
599 int pos_in_item;
600 struct cpu_key key;
601 struct buffer_head *bh, *unbh = NULL;
602 struct item_head *ih, tmp_ih;
603 __le32 *item;
604 int done;
605 int fs_gen;
Frederic Weisbecker26931302009-05-07 23:48:44 +0200606 int lock_depth;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700607 struct reiserfs_transaction_handle *th = NULL;
Jeff Mahoney0222e652009-03-30 14:02:44 -0400608 /* space reserved in transaction batch:
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700609 . 3 balancings in direct->indirect conversion
610 . 1 block involved into reiserfs_update_sd()
611 XXX in practically impossible worst case direct2indirect()
612 can incur (much) more than 3 balancings.
613 quota update for user, group */
614 int jbegin_count =
615 JOURNAL_PER_BALANCE_CNT * 3 + 1 +
616 2 * REISERFS_QUOTA_TRANS_BLOCKS(inode->i_sb);
617 int version;
618 int dangle = 1;
619 loff_t new_offset =
620 (((loff_t) block) << inode->i_sb->s_blocksize_bits) + 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700621
Frederic Weisbecker26931302009-05-07 23:48:44 +0200622 lock_depth = reiserfs_write_lock_once(inode->i_sb);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700623 version = get_inode_item_key_version(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700624
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700625 if (!file_capable(inode, block)) {
Frederic Weisbecker26931302009-05-07 23:48:44 +0200626 reiserfs_write_unlock_once(inode->i_sb, lock_depth);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700627 return -EFBIG;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700628 }
629
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700630 /* if !create, we aren't changing the FS, so we don't need to
631 ** log anything, so we don't need to start a transaction
632 */
633 if (!(create & GET_BLOCK_CREATE)) {
634 int ret;
635 /* find number of block-th logical block of the file */
636 ret = _get_block_create_0(inode, block, bh_result,
637 create | GET_BLOCK_READ_DIRECT);
Frederic Weisbecker26931302009-05-07 23:48:44 +0200638 reiserfs_write_unlock_once(inode->i_sb, lock_depth);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700639 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700640 }
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700641 /*
642 * if we're already in a transaction, make sure to close
643 * any new transactions we start in this func
644 */
645 if ((create & GET_BLOCK_NO_DANGLE) ||
646 reiserfs_transaction_running(inode->i_sb))
647 dangle = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700648
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700649 /* If file is of such a size, that it might have a tail and tails are enabled
650 ** we should mark it as possibly needing tail packing on close
651 */
652 if ((have_large_tails(inode->i_sb)
653 && inode->i_size < i_block_size(inode) * 4)
654 || (have_small_tails(inode->i_sb)
655 && inode->i_size < i_block_size(inode)))
656 REISERFS_I(inode)->i_flags |= i_pack_on_close_mask;
657
658 /* set the key of the first byte in the 'block'-th block of file */
659 make_cpu_key(&key, inode, new_offset, TYPE_ANY, 3 /*key length */ );
660 if ((new_offset + inode->i_sb->s_blocksize - 1) > inode->i_size) {
661 start_trans:
662 th = reiserfs_persistent_transaction(inode->i_sb, jbegin_count);
663 if (!th) {
664 retval = -ENOMEM;
665 goto failure;
666 }
667 reiserfs_update_inode_transaction(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700668 }
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700669 research:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700670
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700671 retval = search_for_position_by_key(inode->i_sb, &key, &path);
672 if (retval == IO_ERROR) {
673 retval = -EIO;
674 goto failure;
675 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700676
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700677 bh = get_last_bh(&path);
678 ih = get_ih(&path);
679 item = get_item(&path);
680 pos_in_item = path.pos_in_item;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700681
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700682 fs_gen = get_generation(inode->i_sb);
683 copy_item_head(&tmp_ih, ih);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700684
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700685 if (allocation_needed
686 (retval, allocated_block_nr, ih, item, pos_in_item)) {
687 /* we have to allocate block for the unformatted node */
688 if (!th) {
689 pathrelse(&path);
690 goto start_trans;
691 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700692
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700693 repeat =
694 _allocate_block(th, block, inode, &allocated_block_nr,
695 &path, create);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700696
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700697 if (repeat == NO_DISK_SPACE || repeat == QUOTA_EXCEEDED) {
698 /* restart the transaction to give the journal a chance to free
699 ** some blocks. releases the path, so we have to go back to
700 ** research if we succeed on the second try
701 */
702 SB_JOURNAL(inode->i_sb)->j_next_async_flush = 1;
703 retval = restart_transaction(th, inode, &path);
704 if (retval)
705 goto failure;
706 repeat =
707 _allocate_block(th, block, inode,
708 &allocated_block_nr, NULL, create);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700709
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700710 if (repeat != NO_DISK_SPACE && repeat != QUOTA_EXCEEDED) {
711 goto research;
712 }
713 if (repeat == QUOTA_EXCEEDED)
714 retval = -EDQUOT;
715 else
716 retval = -ENOSPC;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700717 goto failure;
718 }
719
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700720 if (fs_changed(fs_gen, inode->i_sb)
721 && item_moved(&tmp_ih, &path)) {
722 goto research;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700723 }
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700724 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700725
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700726 if (indirect_item_found(retval, ih)) {
727 b_blocknr_t unfm_ptr;
728 /* 'block'-th block is in the file already (there is
729 corresponding cell in some indirect item). But it may be
730 zero unformatted node pointer (hole) */
731 unfm_ptr = get_block_num(item, pos_in_item);
732 if (unfm_ptr == 0) {
733 /* use allocated block to plug the hole */
734 reiserfs_prepare_for_journal(inode->i_sb, bh, 1);
735 if (fs_changed(fs_gen, inode->i_sb)
736 && item_moved(&tmp_ih, &path)) {
737 reiserfs_restore_prepared_buffer(inode->i_sb,
738 bh);
739 goto research;
740 }
741 set_buffer_new(bh_result);
742 if (buffer_dirty(bh_result)
743 && reiserfs_data_ordered(inode->i_sb))
744 reiserfs_add_ordered_list(inode, bh_result);
745 put_block_num(item, pos_in_item, allocated_block_nr);
746 unfm_ptr = allocated_block_nr;
747 journal_mark_dirty(th, inode->i_sb, bh);
748 reiserfs_update_sd(th, inode);
749 }
750 set_block_dev_mapped(bh_result, unfm_ptr, inode);
751 pathrelse(&path);
752 retval = 0;
753 if (!dangle && th)
754 retval = reiserfs_end_persistent_transaction(th);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700755
Frederic Weisbecker26931302009-05-07 23:48:44 +0200756 reiserfs_write_unlock_once(inode->i_sb, lock_depth);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700757
758 /* the item was found, so new blocks were not added to the file
Jeff Mahoney0222e652009-03-30 14:02:44 -0400759 ** there is no need to make sure the inode is updated with this
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700760 ** transaction
Linus Torvalds1da177e2005-04-16 15:20:36 -0700761 */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700762 return retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700763 }
764
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700765 if (!th) {
766 pathrelse(&path);
767 goto start_trans;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700768 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700769
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700770 /* desired position is not found or is in the direct item. We have
771 to append file with holes up to 'block'-th block converting
772 direct items to indirect one if necessary */
773 done = 0;
774 do {
775 if (is_statdata_le_ih(ih)) {
776 __le32 unp = 0;
777 struct cpu_key tmp_key;
778
779 /* indirect item has to be inserted */
780 make_le_item_head(&tmp_ih, &key, version, 1,
781 TYPE_INDIRECT, UNFM_P_SIZE,
782 0 /* free_space */ );
783
784 if (cpu_key_k_offset(&key) == 1) {
785 /* we are going to add 'block'-th block to the file. Use
786 allocated block for that */
787 unp = cpu_to_le32(allocated_block_nr);
788 set_block_dev_mapped(bh_result,
789 allocated_block_nr, inode);
790 set_buffer_new(bh_result);
791 done = 1;
792 }
793 tmp_key = key; // ;)
794 set_cpu_key_k_offset(&tmp_key, 1);
795 PATH_LAST_POSITION(&path)++;
796
797 retval =
798 reiserfs_insert_item(th, &path, &tmp_key, &tmp_ih,
799 inode, (char *)&unp);
800 if (retval) {
801 reiserfs_free_block(th, inode,
802 allocated_block_nr, 1);
803 goto failure; // retval == -ENOSPC, -EDQUOT or -EIO or -EEXIST
804 }
805 //mark_tail_converted (inode);
806 } else if (is_direct_le_ih(ih)) {
807 /* direct item has to be converted */
808 loff_t tail_offset;
809
810 tail_offset =
811 ((le_ih_k_offset(ih) -
812 1) & ~(inode->i_sb->s_blocksize - 1)) + 1;
813 if (tail_offset == cpu_key_k_offset(&key)) {
814 /* direct item we just found fits into block we have
815 to map. Convert it into unformatted node: use
816 bh_result for the conversion */
817 set_block_dev_mapped(bh_result,
818 allocated_block_nr, inode);
819 unbh = bh_result;
820 done = 1;
821 } else {
822 /* we have to padd file tail stored in direct item(s)
823 up to block size and convert it to unformatted
824 node. FIXME: this should also get into page cache */
825
826 pathrelse(&path);
827 /*
828 * ugly, but we can only end the transaction if
829 * we aren't nested
830 */
831 BUG_ON(!th->t_refcount);
832 if (th->t_refcount == 1) {
833 retval =
834 reiserfs_end_persistent_transaction
835 (th);
836 th = NULL;
837 if (retval)
838 goto failure;
839 }
840
841 retval =
842 convert_tail_for_hole(inode, bh_result,
843 tail_offset);
844 if (retval) {
845 if (retval != -ENOSPC)
Jeff Mahoney0030b642009-03-30 14:02:28 -0400846 reiserfs_error(inode->i_sb,
847 "clm-6004",
848 "convert tail failed "
849 "inode %lu, error %d",
850 inode->i_ino,
851 retval);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700852 if (allocated_block_nr) {
853 /* the bitmap, the super, and the stat data == 3 */
854 if (!th)
855 th = reiserfs_persistent_transaction(inode->i_sb, 3);
856 if (th)
857 reiserfs_free_block(th,
858 inode,
859 allocated_block_nr,
860 1);
861 }
862 goto failure;
863 }
864 goto research;
865 }
866 retval =
867 direct2indirect(th, inode, &path, unbh,
868 tail_offset);
869 if (retval) {
870 reiserfs_unmap_buffer(unbh);
871 reiserfs_free_block(th, inode,
872 allocated_block_nr, 1);
873 goto failure;
874 }
875 /* it is important the set_buffer_uptodate is done after
876 ** the direct2indirect. The buffer might contain valid
877 ** data newer than the data on disk (read by readpage, changed,
878 ** and then sent here by writepage). direct2indirect needs
879 ** to know if unbh was already up to date, so it can decide
880 ** if the data in unbh needs to be replaced with data from
881 ** the disk
882 */
883 set_buffer_uptodate(unbh);
884
885 /* unbh->b_page == NULL in case of DIRECT_IO request, this means
886 buffer will disappear shortly, so it should not be added to
887 */
888 if (unbh->b_page) {
889 /* we've converted the tail, so we must
890 ** flush unbh before the transaction commits
891 */
892 reiserfs_add_tail_list(inode, unbh);
893
894 /* mark it dirty now to prevent commit_write from adding
895 ** this buffer to the inode's dirty buffer list
896 */
897 /*
898 * AKPM: changed __mark_buffer_dirty to mark_buffer_dirty().
899 * It's still atomic, but it sets the page dirty too,
900 * which makes it eligible for writeback at any time by the
901 * VM (which was also the case with __mark_buffer_dirty())
902 */
903 mark_buffer_dirty(unbh);
904 }
905 } else {
906 /* append indirect item with holes if needed, when appending
907 pointer to 'block'-th block use block, which is already
908 allocated */
909 struct cpu_key tmp_key;
910 unp_t unf_single = 0; // We use this in case we need to allocate only
911 // one block which is a fastpath
912 unp_t *un;
913 __u64 max_to_insert =
914 MAX_ITEM_LEN(inode->i_sb->s_blocksize) /
915 UNFM_P_SIZE;
916 __u64 blocks_needed;
917
918 RFALSE(pos_in_item != ih_item_len(ih) / UNFM_P_SIZE,
919 "vs-804: invalid position for append");
920 /* indirect item has to be appended, set up key of that position */
921 make_cpu_key(&tmp_key, inode,
922 le_key_k_offset(version,
923 &(ih->ih_key)) +
924 op_bytes_number(ih,
925 inode->i_sb->s_blocksize),
926 //pos_in_item * inode->i_sb->s_blocksize,
927 TYPE_INDIRECT, 3); // key type is unimportant
928
Vladimir V. Savelievc499ec22006-03-02 02:54:39 -0800929 RFALSE(cpu_key_k_offset(&tmp_key) > cpu_key_k_offset(&key),
930 "green-805: invalid offset");
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700931 blocks_needed =
932 1 +
933 ((cpu_key_k_offset(&key) -
934 cpu_key_k_offset(&tmp_key)) >> inode->i_sb->
935 s_blocksize_bits);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700936
937 if (blocks_needed == 1) {
938 un = &unf_single;
939 } else {
Frederic Weisbecker1d2c6cf2009-11-20 04:11:30 +0100940 un = kzalloc(min(blocks_needed, max_to_insert) * UNFM_P_SIZE, GFP_NOFS);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700941 if (!un) {
942 un = &unf_single;
943 blocks_needed = 1;
944 max_to_insert = 0;
Yan Burman01afb212006-12-06 20:39:01 -0800945 }
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700946 }
947 if (blocks_needed <= max_to_insert) {
948 /* we are going to add target block to the file. Use allocated
949 block for that */
950 un[blocks_needed - 1] =
951 cpu_to_le32(allocated_block_nr);
952 set_block_dev_mapped(bh_result,
953 allocated_block_nr, inode);
954 set_buffer_new(bh_result);
955 done = 1;
956 } else {
957 /* paste hole to the indirect item */
958 /* If kmalloc failed, max_to_insert becomes zero and it means we
959 only have space for one block */
960 blocks_needed =
961 max_to_insert ? max_to_insert : 1;
962 }
963 retval =
964 reiserfs_paste_into_item(th, &path, &tmp_key, inode,
965 (char *)un,
966 UNFM_P_SIZE *
967 blocks_needed);
968
969 if (blocks_needed != 1)
970 kfree(un);
971
972 if (retval) {
973 reiserfs_free_block(th, inode,
974 allocated_block_nr, 1);
975 goto failure;
976 }
977 if (!done) {
978 /* We need to mark new file size in case this function will be
979 interrupted/aborted later on. And we may do this only for
980 holes. */
981 inode->i_size +=
982 inode->i_sb->s_blocksize * blocks_needed;
983 }
984 }
985
986 if (done == 1)
987 break;
988
989 /* this loop could log more blocks than we had originally asked
990 ** for. So, we have to allow the transaction to end if it is
Jeff Mahoney0222e652009-03-30 14:02:44 -0400991 ** too big or too full. Update the inode so things are
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700992 ** consistent if we crash before the function returns
993 **
994 ** release the path so that anybody waiting on the path before
995 ** ending their transaction will be able to continue.
996 */
997 if (journal_transaction_should_end(th, th->t_blocks_allocated)) {
998 retval = restart_transaction(th, inode, &path);
999 if (retval)
1000 goto failure;
1001 }
Frederic Weisbecker8ebc4232009-04-07 04:19:49 +02001002 /*
1003 * inserting indirect pointers for a hole can take a
1004 * long time. reschedule if needed and also release the write
1005 * lock for others.
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001006 */
Frederic Weisbecker26931302009-05-07 23:48:44 +02001007 if (need_resched()) {
1008 reiserfs_write_unlock_once(inode->i_sb, lock_depth);
1009 schedule();
1010 lock_depth = reiserfs_write_lock_once(inode->i_sb);
1011 }
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001012
1013 retval = search_for_position_by_key(inode->i_sb, &key, &path);
1014 if (retval == IO_ERROR) {
1015 retval = -EIO;
1016 goto failure;
1017 }
1018 if (retval == POSITION_FOUND) {
Jeff Mahoney45b03d52009-03-30 14:02:21 -04001019 reiserfs_warning(inode->i_sb, "vs-825",
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001020 "%K should not be found", &key);
1021 retval = -EEXIST;
1022 if (allocated_block_nr)
1023 reiserfs_free_block(th, inode,
1024 allocated_block_nr, 1);
1025 pathrelse(&path);
1026 goto failure;
1027 }
1028 bh = get_last_bh(&path);
1029 ih = get_ih(&path);
1030 item = get_item(&path);
1031 pos_in_item = path.pos_in_item;
1032 } while (1);
1033
1034 retval = 0;
1035
1036 failure:
1037 if (th && (!dangle || (retval && !th->t_trans_id))) {
1038 int err;
1039 if (th->t_trans_id)
1040 reiserfs_update_sd(th, inode);
1041 err = reiserfs_end_persistent_transaction(th);
1042 if (err)
1043 retval = err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001044 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001045
Frederic Weisbecker26931302009-05-07 23:48:44 +02001046 reiserfs_write_unlock_once(inode->i_sb, lock_depth);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001047 reiserfs_check_path(&path);
1048 return retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001049}
1050
1051static int
1052reiserfs_readpages(struct file *file, struct address_space *mapping,
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001053 struct list_head *pages, unsigned nr_pages)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001054{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001055 return mpage_readpages(mapping, pages, nr_pages, reiserfs_get_block);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001056}
1057
1058/* Compute real number of used bytes by file
1059 * Following three functions can go away when we'll have enough space in stat item
1060 */
1061static int real_space_diff(struct inode *inode, int sd_size)
1062{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001063 int bytes;
1064 loff_t blocksize = inode->i_sb->s_blocksize;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001065
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001066 if (S_ISLNK(inode->i_mode) || S_ISDIR(inode->i_mode))
1067 return sd_size;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001068
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001069 /* End of file is also in full block with indirect reference, so round
1070 ** up to the next block.
1071 **
1072 ** there is just no way to know if the tail is actually packed
1073 ** on the file, so we have to assume it isn't. When we pack the
1074 ** tail, we add 4 bytes to pretend there really is an unformatted
1075 ** node pointer
1076 */
1077 bytes =
1078 ((inode->i_size +
1079 (blocksize - 1)) >> inode->i_sb->s_blocksize_bits) * UNFM_P_SIZE +
1080 sd_size;
1081 return bytes;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001082}
1083
1084static inline loff_t to_real_used_space(struct inode *inode, ulong blocks,
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001085 int sd_size)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001086{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001087 if (S_ISLNK(inode->i_mode) || S_ISDIR(inode->i_mode)) {
1088 return inode->i_size +
1089 (loff_t) (real_space_diff(inode, sd_size));
1090 }
1091 return ((loff_t) real_space_diff(inode, sd_size)) +
1092 (((loff_t) blocks) << 9);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001093}
1094
1095/* Compute number of blocks used by file in ReiserFS counting */
1096static inline ulong to_fake_used_blocks(struct inode *inode, int sd_size)
1097{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001098 loff_t bytes = inode_get_bytes(inode);
1099 loff_t real_space = real_space_diff(inode, sd_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001100
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001101 /* keeps fsck and non-quota versions of reiserfs happy */
1102 if (S_ISLNK(inode->i_mode) || S_ISDIR(inode->i_mode)) {
1103 bytes += (loff_t) 511;
1104 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001105
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001106 /* files from before the quota patch might i_blocks such that
1107 ** bytes < real_space. Deal with that here to prevent it from
1108 ** going negative.
1109 */
1110 if (bytes < real_space)
1111 return 0;
1112 return (bytes - real_space) >> 9;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001113}
1114
1115//
1116// BAD: new directories have stat data of new type and all other items
1117// of old type. Version stored in the inode says about body items, so
1118// in update_stat_data we can not rely on inode, but have to check
1119// item version directly
1120//
1121
1122// called by read_locked_inode
Josef "Jeff" Sipekfec6d052006-12-08 02:36:32 -08001123static void init_inode(struct inode *inode, struct treepath *path)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001124{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001125 struct buffer_head *bh;
1126 struct item_head *ih;
1127 __u32 rdev;
1128 //int version = ITEM_VERSION_1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001129
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001130 bh = PATH_PLAST_BUFFER(path);
1131 ih = PATH_PITEM_HEAD(path);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001132
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001133 copy_key(INODE_PKEY(inode), &(ih->ih_key));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001134
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001135 INIT_LIST_HEAD(&(REISERFS_I(inode)->i_prealloc_list));
1136 REISERFS_I(inode)->i_flags = 0;
1137 REISERFS_I(inode)->i_prealloc_block = 0;
1138 REISERFS_I(inode)->i_prealloc_count = 0;
1139 REISERFS_I(inode)->i_trans_id = 0;
1140 REISERFS_I(inode)->i_jl = NULL;
Vladimir Savelievde145692007-01-22 20:40:46 -08001141 mutex_init(&(REISERFS_I(inode)->i_mmap));
Alexey Dobriyan068fbb32006-09-29 01:59:58 -07001142 reiserfs_init_xattr_rwsem(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001143
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001144 if (stat_data_v1(ih)) {
1145 struct stat_data_v1 *sd =
1146 (struct stat_data_v1 *)B_I_PITEM(bh, ih);
1147 unsigned long blocks;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001148
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001149 set_inode_item_key_version(inode, KEY_FORMAT_3_5);
1150 set_inode_sd_version(inode, STAT_DATA_V1);
1151 inode->i_mode = sd_v1_mode(sd);
1152 inode->i_nlink = sd_v1_nlink(sd);
1153 inode->i_uid = sd_v1_uid(sd);
1154 inode->i_gid = sd_v1_gid(sd);
1155 inode->i_size = sd_v1_size(sd);
1156 inode->i_atime.tv_sec = sd_v1_atime(sd);
1157 inode->i_mtime.tv_sec = sd_v1_mtime(sd);
1158 inode->i_ctime.tv_sec = sd_v1_ctime(sd);
1159 inode->i_atime.tv_nsec = 0;
1160 inode->i_ctime.tv_nsec = 0;
1161 inode->i_mtime.tv_nsec = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001162
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001163 inode->i_blocks = sd_v1_blocks(sd);
1164 inode->i_generation = le32_to_cpu(INODE_PKEY(inode)->k_dir_id);
1165 blocks = (inode->i_size + 511) >> 9;
1166 blocks = _ROUND_UP(blocks, inode->i_sb->s_blocksize >> 9);
1167 if (inode->i_blocks > blocks) {
1168 // there was a bug in <=3.5.23 when i_blocks could take negative
1169 // values. Starting from 3.5.17 this value could even be stored in
1170 // stat data. For such files we set i_blocks based on file
1171 // size. Just 2 notes: this can be wrong for sparce files. On-disk value will be
1172 // only updated if file's inode will ever change
1173 inode->i_blocks = blocks;
1174 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001175
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001176 rdev = sd_v1_rdev(sd);
1177 REISERFS_I(inode)->i_first_direct_byte =
1178 sd_v1_first_direct_byte(sd);
1179 /* an early bug in the quota code can give us an odd number for the
1180 ** block count. This is incorrect, fix it here.
1181 */
1182 if (inode->i_blocks & 1) {
1183 inode->i_blocks++;
1184 }
1185 inode_set_bytes(inode,
1186 to_real_used_space(inode, inode->i_blocks,
1187 SD_V1_SIZE));
1188 /* nopack is initially zero for v1 objects. For v2 objects,
1189 nopack is initialised from sd_attrs */
1190 REISERFS_I(inode)->i_flags &= ~i_nopack_mask;
1191 } else {
1192 // new stat data found, but object may have old items
1193 // (directories and symlinks)
1194 struct stat_data *sd = (struct stat_data *)B_I_PITEM(bh, ih);
1195
1196 inode->i_mode = sd_v2_mode(sd);
1197 inode->i_nlink = sd_v2_nlink(sd);
1198 inode->i_uid = sd_v2_uid(sd);
1199 inode->i_size = sd_v2_size(sd);
1200 inode->i_gid = sd_v2_gid(sd);
1201 inode->i_mtime.tv_sec = sd_v2_mtime(sd);
1202 inode->i_atime.tv_sec = sd_v2_atime(sd);
1203 inode->i_ctime.tv_sec = sd_v2_ctime(sd);
1204 inode->i_ctime.tv_nsec = 0;
1205 inode->i_mtime.tv_nsec = 0;
1206 inode->i_atime.tv_nsec = 0;
1207 inode->i_blocks = sd_v2_blocks(sd);
1208 rdev = sd_v2_rdev(sd);
1209 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
1210 inode->i_generation =
1211 le32_to_cpu(INODE_PKEY(inode)->k_dir_id);
1212 else
1213 inode->i_generation = sd_v2_generation(sd);
1214
1215 if (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode))
1216 set_inode_item_key_version(inode, KEY_FORMAT_3_5);
1217 else
1218 set_inode_item_key_version(inode, KEY_FORMAT_3_6);
1219 REISERFS_I(inode)->i_first_direct_byte = 0;
1220 set_inode_sd_version(inode, STAT_DATA_V2);
1221 inode_set_bytes(inode,
1222 to_real_used_space(inode, inode->i_blocks,
1223 SD_V2_SIZE));
1224 /* read persistent inode attributes from sd and initalise
1225 generic inode flags from them */
1226 REISERFS_I(inode)->i_attrs = sd_v2_attrs(sd);
1227 sd_attrs_to_i_attrs(sd_v2_attrs(sd), inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001228 }
1229
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001230 pathrelse(path);
1231 if (S_ISREG(inode->i_mode)) {
1232 inode->i_op = &reiserfs_file_inode_operations;
1233 inode->i_fop = &reiserfs_file_operations;
1234 inode->i_mapping->a_ops = &reiserfs_address_space_operations;
1235 } else if (S_ISDIR(inode->i_mode)) {
1236 inode->i_op = &reiserfs_dir_inode_operations;
1237 inode->i_fop = &reiserfs_dir_operations;
1238 } else if (S_ISLNK(inode->i_mode)) {
1239 inode->i_op = &reiserfs_symlink_inode_operations;
1240 inode->i_mapping->a_ops = &reiserfs_address_space_operations;
1241 } else {
1242 inode->i_blocks = 0;
1243 inode->i_op = &reiserfs_special_inode_operations;
1244 init_special_inode(inode, inode->i_mode, new_decode_dev(rdev));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001245 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001246}
1247
Linus Torvalds1da177e2005-04-16 15:20:36 -07001248// update new stat data with inode fields
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001249static void inode2sd(void *sd, struct inode *inode, loff_t size)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001250{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001251 struct stat_data *sd_v2 = (struct stat_data *)sd;
1252 __u16 flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001253
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001254 set_sd_v2_mode(sd_v2, inode->i_mode);
1255 set_sd_v2_nlink(sd_v2, inode->i_nlink);
1256 set_sd_v2_uid(sd_v2, inode->i_uid);
1257 set_sd_v2_size(sd_v2, size);
1258 set_sd_v2_gid(sd_v2, inode->i_gid);
1259 set_sd_v2_mtime(sd_v2, inode->i_mtime.tv_sec);
1260 set_sd_v2_atime(sd_v2, inode->i_atime.tv_sec);
1261 set_sd_v2_ctime(sd_v2, inode->i_ctime.tv_sec);
1262 set_sd_v2_blocks(sd_v2, to_fake_used_blocks(inode, SD_V2_SIZE));
1263 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
1264 set_sd_v2_rdev(sd_v2, new_encode_dev(inode->i_rdev));
1265 else
1266 set_sd_v2_generation(sd_v2, inode->i_generation);
1267 flags = REISERFS_I(inode)->i_attrs;
1268 i_attrs_to_sd_attrs(inode, &flags);
1269 set_sd_v2_attrs(sd_v2, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001270}
1271
Linus Torvalds1da177e2005-04-16 15:20:36 -07001272// used to copy inode's fields to old stat data
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001273static void inode2sd_v1(void *sd, struct inode *inode, loff_t size)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001274{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001275 struct stat_data_v1 *sd_v1 = (struct stat_data_v1 *)sd;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001276
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001277 set_sd_v1_mode(sd_v1, inode->i_mode);
1278 set_sd_v1_uid(sd_v1, inode->i_uid);
1279 set_sd_v1_gid(sd_v1, inode->i_gid);
1280 set_sd_v1_nlink(sd_v1, inode->i_nlink);
1281 set_sd_v1_size(sd_v1, size);
1282 set_sd_v1_atime(sd_v1, inode->i_atime.tv_sec);
1283 set_sd_v1_ctime(sd_v1, inode->i_ctime.tv_sec);
1284 set_sd_v1_mtime(sd_v1, inode->i_mtime.tv_sec);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001285
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001286 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
1287 set_sd_v1_rdev(sd_v1, new_encode_dev(inode->i_rdev));
1288 else
1289 set_sd_v1_blocks(sd_v1, to_fake_used_blocks(inode, SD_V1_SIZE));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001290
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001291 // Sigh. i_first_direct_byte is back
1292 set_sd_v1_first_direct_byte(sd_v1,
1293 REISERFS_I(inode)->i_first_direct_byte);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001294}
1295
Linus Torvalds1da177e2005-04-16 15:20:36 -07001296/* NOTE, you must prepare the buffer head before sending it here,
1297** and then log it after the call
1298*/
Josef "Jeff" Sipekfec6d052006-12-08 02:36:32 -08001299static void update_stat_data(struct treepath *path, struct inode *inode,
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001300 loff_t size)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001301{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001302 struct buffer_head *bh;
1303 struct item_head *ih;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001304
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001305 bh = PATH_PLAST_BUFFER(path);
1306 ih = PATH_PITEM_HEAD(path);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001307
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001308 if (!is_statdata_le_ih(ih))
Jeff Mahoneyc3a9c212009-03-30 14:02:25 -04001309 reiserfs_panic(inode->i_sb, "vs-13065", "key %k, found item %h",
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001310 INODE_PKEY(inode), ih);
1311
1312 if (stat_data_v1(ih)) {
1313 // path points to old stat data
1314 inode2sd_v1(B_I_PITEM(bh, ih), inode, size);
1315 } else {
1316 inode2sd(B_I_PITEM(bh, ih), inode, size);
1317 }
1318
1319 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001320}
1321
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001322void reiserfs_update_sd_size(struct reiserfs_transaction_handle *th,
1323 struct inode *inode, loff_t size)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001324{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001325 struct cpu_key key;
1326 INITIALIZE_PATH(path);
1327 struct buffer_head *bh;
1328 int fs_gen;
1329 struct item_head *ih, tmp_ih;
1330 int retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001331
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001332 BUG_ON(!th->t_trans_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001333
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001334 make_cpu_key(&key, inode, SD_OFFSET, TYPE_STAT_DATA, 3); //key type is unimportant
1335
1336 for (;;) {
1337 int pos;
1338 /* look for the object's stat data */
1339 retval = search_item(inode->i_sb, &key, &path);
1340 if (retval == IO_ERROR) {
Jeff Mahoney0030b642009-03-30 14:02:28 -04001341 reiserfs_error(inode->i_sb, "vs-13050",
1342 "i/o failure occurred trying to "
1343 "update %K stat data", &key);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001344 return;
1345 }
1346 if (retval == ITEM_NOT_FOUND) {
1347 pos = PATH_LAST_POSITION(&path);
1348 pathrelse(&path);
1349 if (inode->i_nlink == 0) {
1350 /*reiserfs_warning (inode->i_sb, "vs-13050: reiserfs_update_sd: i_nlink == 0, stat data not found"); */
1351 return;
1352 }
Jeff Mahoney45b03d52009-03-30 14:02:21 -04001353 reiserfs_warning(inode->i_sb, "vs-13060",
1354 "stat data of object %k (nlink == %d) "
1355 "not found (pos %d)",
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001356 INODE_PKEY(inode), inode->i_nlink,
1357 pos);
1358 reiserfs_check_path(&path);
1359 return;
1360 }
1361
1362 /* sigh, prepare_for_journal might schedule. When it schedules the
1363 ** FS might change. We have to detect that, and loop back to the
1364 ** search if the stat data item has moved
1365 */
1366 bh = get_last_bh(&path);
1367 ih = get_ih(&path);
1368 copy_item_head(&tmp_ih, ih);
1369 fs_gen = get_generation(inode->i_sb);
1370 reiserfs_prepare_for_journal(inode->i_sb, bh, 1);
1371 if (fs_changed(fs_gen, inode->i_sb)
1372 && item_moved(&tmp_ih, &path)) {
1373 reiserfs_restore_prepared_buffer(inode->i_sb, bh);
1374 continue; /* Stat_data item has been moved after scheduling. */
1375 }
1376 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001377 }
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001378 update_stat_data(&path, inode, size);
1379 journal_mark_dirty(th, th->t_super, bh);
1380 pathrelse(&path);
1381 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001382}
1383
1384/* reiserfs_read_locked_inode is called to read the inode off disk, and it
1385** does a make_bad_inode when things go wrong. But, we need to make sure
1386** and clear the key in the private portion of the inode, otherwise a
1387** corresponding iput might try to delete whatever object the inode last
1388** represented.
1389*/
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001390static void reiserfs_make_bad_inode(struct inode *inode)
1391{
1392 memset(INODE_PKEY(inode), 0, KEY_SIZE);
1393 make_bad_inode(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001394}
1395
1396//
1397// initially this function was derived from minix or ext2's analog and
1398// evolved as the prototype did
1399//
1400
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001401int reiserfs_init_locked_inode(struct inode *inode, void *p)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001402{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001403 struct reiserfs_iget_args *args = (struct reiserfs_iget_args *)p;
1404 inode->i_ino = args->objectid;
1405 INODE_PKEY(inode)->k_dir_id = cpu_to_le32(args->dirid);
1406 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001407}
1408
1409/* looks for stat data in the tree, and fills up the fields of in-core
1410 inode stat data fields */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001411void reiserfs_read_locked_inode(struct inode *inode,
1412 struct reiserfs_iget_args *args)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001413{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001414 INITIALIZE_PATH(path_to_sd);
1415 struct cpu_key key;
1416 unsigned long dirino;
1417 int retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001418
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001419 dirino = args->dirid;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001420
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001421 /* set version 1, version 2 could be used too, because stat data
1422 key is the same in both versions */
1423 key.version = KEY_FORMAT_3_5;
1424 key.on_disk_key.k_dir_id = dirino;
1425 key.on_disk_key.k_objectid = inode->i_ino;
1426 key.on_disk_key.k_offset = 0;
1427 key.on_disk_key.k_type = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001428
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001429 /* look for the object's stat data */
1430 retval = search_item(inode->i_sb, &key, &path_to_sd);
1431 if (retval == IO_ERROR) {
Jeff Mahoney0030b642009-03-30 14:02:28 -04001432 reiserfs_error(inode->i_sb, "vs-13070",
1433 "i/o failure occurred trying to find "
1434 "stat data of %K", &key);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001435 reiserfs_make_bad_inode(inode);
1436 return;
1437 }
1438 if (retval != ITEM_FOUND) {
1439 /* a stale NFS handle can trigger this without it being an error */
1440 pathrelse(&path_to_sd);
1441 reiserfs_make_bad_inode(inode);
1442 inode->i_nlink = 0;
1443 return;
1444 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001445
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001446 init_inode(inode, &path_to_sd);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001447
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001448 /* It is possible that knfsd is trying to access inode of a file
1449 that is being removed from the disk by some other thread. As we
1450 update sd on unlink all that is required is to check for nlink
1451 here. This bug was first found by Sizif when debugging
1452 SquidNG/Butterfly, forgotten, and found again after Philippe
Jeff Mahoney0222e652009-03-30 14:02:44 -04001453 Gramoulle <philippe.gramoulle@mmania.com> reproduced it.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001454
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001455 More logical fix would require changes in fs/inode.c:iput() to
1456 remove inode from hash-table _after_ fs cleaned disk stuff up and
1457 in iget() to return NULL if I_FREEING inode is found in
1458 hash-table. */
1459 /* Currently there is one place where it's ok to meet inode with
1460 nlink==0: processing of open-unlinked and half-truncated files
1461 during mount (fs/reiserfs/super.c:finish_unfinished()). */
1462 if ((inode->i_nlink == 0) &&
1463 !REISERFS_SB(inode->i_sb)->s_is_unlinked_ok) {
Jeff Mahoney45b03d52009-03-30 14:02:21 -04001464 reiserfs_warning(inode->i_sb, "vs-13075",
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001465 "dead inode read from disk %K. "
1466 "This is likely to be race with knfsd. Ignore",
1467 &key);
1468 reiserfs_make_bad_inode(inode);
1469 }
1470
1471 reiserfs_check_path(&path_to_sd); /* init inode should be relsing */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001472
1473}
1474
1475/**
1476 * reiserfs_find_actor() - "find actor" reiserfs supplies to iget5_locked().
1477 *
1478 * @inode: inode from hash table to check
1479 * @opaque: "cookie" passed to iget5_locked(). This is &reiserfs_iget_args.
1480 *
1481 * This function is called by iget5_locked() to distinguish reiserfs inodes
1482 * having the same inode numbers. Such inodes can only exist due to some
1483 * error condition. One of them should be bad. Inodes with identical
1484 * inode numbers (objectids) are distinguished by parent directory ids.
1485 *
1486 */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001487int reiserfs_find_actor(struct inode *inode, void *opaque)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001488{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001489 struct reiserfs_iget_args *args;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001490
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001491 args = opaque;
1492 /* args is already in CPU order */
1493 return (inode->i_ino == args->objectid) &&
1494 (le32_to_cpu(INODE_PKEY(inode)->k_dir_id) == args->dirid);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001495}
1496
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001497struct inode *reiserfs_iget(struct super_block *s, const struct cpu_key *key)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001498{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001499 struct inode *inode;
1500 struct reiserfs_iget_args args;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001501
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001502 args.objectid = key->on_disk_key.k_objectid;
1503 args.dirid = key->on_disk_key.k_dir_id;
Frederic Weisbecker175359f2010-02-11 13:13:10 +01001504 reiserfs_write_unlock(s);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001505 inode = iget5_locked(s, key->on_disk_key.k_objectid,
1506 reiserfs_find_actor, reiserfs_init_locked_inode,
1507 (void *)(&args));
Frederic Weisbecker175359f2010-02-11 13:13:10 +01001508 reiserfs_write_lock(s);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001509 if (!inode)
1510 return ERR_PTR(-ENOMEM);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001511
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001512 if (inode->i_state & I_NEW) {
1513 reiserfs_read_locked_inode(inode, &args);
1514 unlock_new_inode(inode);
1515 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001516
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001517 if (comp_short_keys(INODE_PKEY(inode), key) || is_bad_inode(inode)) {
1518 /* either due to i/o error or a stale NFS handle */
1519 iput(inode);
1520 inode = NULL;
1521 }
1522 return inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001523}
1524
Christoph Hellwigbe55caf2007-10-21 16:42:13 -07001525static struct dentry *reiserfs_get_dentry(struct super_block *sb,
1526 u32 objectid, u32 dir_id, u32 generation)
1527
Linus Torvalds1da177e2005-04-16 15:20:36 -07001528{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001529 struct cpu_key key;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001530 struct inode *inode;
1531
Christoph Hellwigbe55caf2007-10-21 16:42:13 -07001532 key.on_disk_key.k_objectid = objectid;
1533 key.on_disk_key.k_dir_id = dir_id;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001534 reiserfs_write_lock(sb);
1535 inode = reiserfs_iget(sb, &key);
Christoph Hellwigbe55caf2007-10-21 16:42:13 -07001536 if (inode && !IS_ERR(inode) && generation != 0 &&
1537 generation != inode->i_generation) {
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001538 iput(inode);
1539 inode = NULL;
1540 }
1541 reiserfs_write_unlock(sb);
Christoph Hellwig44003722008-08-11 15:49:04 +02001542
1543 return d_obtain_alias(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001544}
1545
Christoph Hellwigbe55caf2007-10-21 16:42:13 -07001546struct dentry *reiserfs_fh_to_dentry(struct super_block *sb, struct fid *fid,
1547 int fh_len, int fh_type)
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001548{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001549 /* fhtype happens to reflect the number of u32s encoded.
1550 * due to a bug in earlier code, fhtype might indicate there
1551 * are more u32s then actually fitted.
1552 * so if fhtype seems to be more than len, reduce fhtype.
1553 * Valid types are:
1554 * 2 - objectid + dir_id - legacy support
1555 * 3 - objectid + dir_id + generation
1556 * 4 - objectid + dir_id + objectid and dirid of parent - legacy
1557 * 5 - objectid + dir_id + generation + objectid and dirid of parent
1558 * 6 - as above plus generation of directory
1559 * 6 does not fit in NFSv2 handles
1560 */
Christoph Hellwigbe55caf2007-10-21 16:42:13 -07001561 if (fh_type > fh_len) {
1562 if (fh_type != 6 || fh_len != 5)
Jeff Mahoney45b03d52009-03-30 14:02:21 -04001563 reiserfs_warning(sb, "reiserfs-13077",
Christoph Hellwigbe55caf2007-10-21 16:42:13 -07001564 "nfsd/reiserfs, fhtype=%d, len=%d - odd",
1565 fh_type, fh_len);
1566 fh_type = 5;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001567 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001568
Christoph Hellwigbe55caf2007-10-21 16:42:13 -07001569 return reiserfs_get_dentry(sb, fid->raw[0], fid->raw[1],
1570 (fh_type == 3 || fh_type >= 5) ? fid->raw[2] : 0);
1571}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001572
Christoph Hellwigbe55caf2007-10-21 16:42:13 -07001573struct dentry *reiserfs_fh_to_parent(struct super_block *sb, struct fid *fid,
1574 int fh_len, int fh_type)
1575{
1576 if (fh_type < 4)
1577 return NULL;
1578
1579 return reiserfs_get_dentry(sb,
1580 (fh_type >= 5) ? fid->raw[3] : fid->raw[2],
1581 (fh_type >= 5) ? fid->raw[4] : fid->raw[3],
1582 (fh_type == 6) ? fid->raw[5] : 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001583}
1584
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001585int reiserfs_encode_fh(struct dentry *dentry, __u32 * data, int *lenp,
1586 int need_parent)
1587{
1588 struct inode *inode = dentry->d_inode;
1589 int maxlen = *lenp;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001590
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001591 if (maxlen < 3)
1592 return 255;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001593
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001594 data[0] = inode->i_ino;
1595 data[1] = le32_to_cpu(INODE_PKEY(inode)->k_dir_id);
1596 data[2] = inode->i_generation;
1597 *lenp = 3;
1598 /* no room for directory info? return what we've stored so far */
1599 if (maxlen < 5 || !need_parent)
1600 return 3;
1601
1602 spin_lock(&dentry->d_lock);
1603 inode = dentry->d_parent->d_inode;
1604 data[3] = inode->i_ino;
1605 data[4] = le32_to_cpu(INODE_PKEY(inode)->k_dir_id);
1606 *lenp = 5;
1607 if (maxlen >= 6) {
1608 data[5] = inode->i_generation;
1609 *lenp = 6;
1610 }
1611 spin_unlock(&dentry->d_lock);
1612 return *lenp;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001613}
1614
Linus Torvalds1da177e2005-04-16 15:20:36 -07001615/* looks for stat data, then copies fields to it, marks the buffer
1616 containing stat data as dirty */
1617/* reiserfs inodes are never really dirty, since the dirty inode call
1618** always logs them. This call allows the VFS inode marking routines
1619** to properly mark inodes for datasync and such, but only actually
1620** does something when called for a synchronous update.
1621*/
Christoph Hellwiga9185b42010-03-05 09:21:37 +01001622int reiserfs_write_inode(struct inode *inode, struct writeback_control *wbc)
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001623{
1624 struct reiserfs_transaction_handle th;
1625 int jbegin_count = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001626
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001627 if (inode->i_sb->s_flags & MS_RDONLY)
1628 return -EROFS;
1629 /* memory pressure can sometimes initiate write_inode calls with sync == 1,
Jeff Mahoney0222e652009-03-30 14:02:44 -04001630 ** these cases are just when the system needs ram, not when the
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001631 ** inode needs to reach disk for safety, and they can safely be
1632 ** ignored because the altered inode has already been logged.
1633 */
Christoph Hellwiga9185b42010-03-05 09:21:37 +01001634 if (wbc->sync_mode == WB_SYNC_ALL && !(current->flags & PF_MEMALLOC)) {
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001635 reiserfs_write_lock(inode->i_sb);
1636 if (!journal_begin(&th, inode->i_sb, jbegin_count)) {
1637 reiserfs_update_sd(&th, inode);
1638 journal_end_sync(&th, inode->i_sb, jbegin_count);
1639 }
1640 reiserfs_write_unlock(inode->i_sb);
1641 }
1642 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001643}
1644
1645/* stat data of new object is inserted already, this inserts the item
1646 containing "." and ".." entries */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001647static int reiserfs_new_directory(struct reiserfs_transaction_handle *th,
1648 struct inode *inode,
Josef "Jeff" Sipekfec6d052006-12-08 02:36:32 -08001649 struct item_head *ih, struct treepath *path,
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001650 struct inode *dir)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001651{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001652 struct super_block *sb = th->t_super;
1653 char empty_dir[EMPTY_DIR_SIZE];
1654 char *body = empty_dir;
1655 struct cpu_key key;
1656 int retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001657
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001658 BUG_ON(!th->t_trans_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001659
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001660 _make_cpu_key(&key, KEY_FORMAT_3_5, le32_to_cpu(ih->ih_key.k_dir_id),
1661 le32_to_cpu(ih->ih_key.k_objectid), DOT_OFFSET,
1662 TYPE_DIRENTRY, 3 /*key length */ );
1663
1664 /* compose item head for new item. Directories consist of items of
1665 old type (ITEM_VERSION_1). Do not set key (second arg is 0), it
1666 is done by reiserfs_new_inode */
1667 if (old_format_only(sb)) {
1668 make_le_item_head(ih, NULL, KEY_FORMAT_3_5, DOT_OFFSET,
1669 TYPE_DIRENTRY, EMPTY_DIR_SIZE_V1, 2);
1670
1671 make_empty_dir_item_v1(body, ih->ih_key.k_dir_id,
1672 ih->ih_key.k_objectid,
1673 INODE_PKEY(dir)->k_dir_id,
1674 INODE_PKEY(dir)->k_objectid);
1675 } else {
1676 make_le_item_head(ih, NULL, KEY_FORMAT_3_5, DOT_OFFSET,
1677 TYPE_DIRENTRY, EMPTY_DIR_SIZE, 2);
1678
1679 make_empty_dir_item(body, ih->ih_key.k_dir_id,
1680 ih->ih_key.k_objectid,
1681 INODE_PKEY(dir)->k_dir_id,
1682 INODE_PKEY(dir)->k_objectid);
1683 }
1684
1685 /* look for place in the tree for new item */
1686 retval = search_item(sb, &key, path);
1687 if (retval == IO_ERROR) {
Jeff Mahoney0030b642009-03-30 14:02:28 -04001688 reiserfs_error(sb, "vs-13080",
1689 "i/o failure occurred creating new directory");
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001690 return -EIO;
1691 }
1692 if (retval == ITEM_FOUND) {
1693 pathrelse(path);
Jeff Mahoney45b03d52009-03-30 14:02:21 -04001694 reiserfs_warning(sb, "vs-13070",
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001695 "object with this key exists (%k)",
1696 &(ih->ih_key));
1697 return -EEXIST;
1698 }
1699
1700 /* insert item, that is empty directory item */
1701 return reiserfs_insert_item(th, path, &key, ih, inode, body);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001702}
1703
Linus Torvalds1da177e2005-04-16 15:20:36 -07001704/* stat data of object has been inserted, this inserts the item
1705 containing the body of symlink */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001706static int reiserfs_new_symlink(struct reiserfs_transaction_handle *th, struct inode *inode, /* Inode of symlink */
1707 struct item_head *ih,
Josef "Jeff" Sipekfec6d052006-12-08 02:36:32 -08001708 struct treepath *path, const char *symname,
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001709 int item_len)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001710{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001711 struct super_block *sb = th->t_super;
1712 struct cpu_key key;
1713 int retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001714
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001715 BUG_ON(!th->t_trans_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001716
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001717 _make_cpu_key(&key, KEY_FORMAT_3_5,
1718 le32_to_cpu(ih->ih_key.k_dir_id),
1719 le32_to_cpu(ih->ih_key.k_objectid),
1720 1, TYPE_DIRECT, 3 /*key length */ );
Linus Torvalds1da177e2005-04-16 15:20:36 -07001721
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001722 make_le_item_head(ih, NULL, KEY_FORMAT_3_5, 1, TYPE_DIRECT, item_len,
1723 0 /*free_space */ );
Linus Torvalds1da177e2005-04-16 15:20:36 -07001724
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001725 /* look for place in the tree for new item */
1726 retval = search_item(sb, &key, path);
1727 if (retval == IO_ERROR) {
Jeff Mahoney0030b642009-03-30 14:02:28 -04001728 reiserfs_error(sb, "vs-13080",
1729 "i/o failure occurred creating new symlink");
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001730 return -EIO;
1731 }
1732 if (retval == ITEM_FOUND) {
1733 pathrelse(path);
Jeff Mahoney45b03d52009-03-30 14:02:21 -04001734 reiserfs_warning(sb, "vs-13080",
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001735 "object with this key exists (%k)",
1736 &(ih->ih_key));
1737 return -EEXIST;
1738 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001739
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001740 /* insert item, that is body of symlink */
1741 return reiserfs_insert_item(th, path, &key, ih, inode, symname);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001742}
1743
Linus Torvalds1da177e2005-04-16 15:20:36 -07001744/* inserts the stat data into the tree, and then calls
1745 reiserfs_new_directory (to insert ".", ".." item if new object is
1746 directory) or reiserfs_new_symlink (to insert symlink body if new
Jeff Mahoney0222e652009-03-30 14:02:44 -04001747 object is symlink) or nothing (if new object is regular file)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001748
1749 NOTE! uid and gid must already be set in the inode. If we return
1750 non-zero due to an error, we have to drop the quota previously allocated
1751 for the fresh inode. This can only be done outside a transaction, so
1752 if we return non-zero, we also end the transaction. */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001753int reiserfs_new_inode(struct reiserfs_transaction_handle *th,
1754 struct inode *dir, int mode, const char *symname,
Jeff Mahoney0222e652009-03-30 14:02:44 -04001755 /* 0 for regular, EMTRY_DIR_SIZE for dirs,
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001756 strlen (symname) for symlinks) */
1757 loff_t i_size, struct dentry *dentry,
Jeff Mahoney57fe60d2009-03-30 14:02:41 -04001758 struct inode *inode,
1759 struct reiserfs_security_handle *security)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001760{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001761 struct super_block *sb;
Al Viroc1eaa262008-12-30 02:03:58 -05001762 struct reiserfs_iget_args args;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001763 INITIALIZE_PATH(path_to_key);
1764 struct cpu_key key;
1765 struct item_head ih;
1766 struct stat_data sd;
1767 int retval;
1768 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001769
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001770 BUG_ON(!th->t_trans_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001771
Christoph Hellwig871a2932010-03-03 09:05:07 -05001772 dquot_initialize(inode);
Christoph Hellwig63936dd2010-03-03 09:05:01 -05001773 err = dquot_alloc_inode(inode);
1774 if (err)
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001775 goto out_end_trans;
Eric Sesterhenn585b7742006-10-04 02:15:30 -07001776 if (!dir->i_nlink) {
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001777 err = -EPERM;
1778 goto out_bad_inode;
1779 }
1780
1781 sb = dir->i_sb;
1782
1783 /* item head of new item */
1784 ih.ih_key.k_dir_id = reiserfs_choose_packing(dir);
1785 ih.ih_key.k_objectid = cpu_to_le32(reiserfs_get_unused_objectid(th));
1786 if (!ih.ih_key.k_objectid) {
1787 err = -ENOMEM;
1788 goto out_bad_inode;
1789 }
Al Viroc1eaa262008-12-30 02:03:58 -05001790 args.objectid = inode->i_ino = le32_to_cpu(ih.ih_key.k_objectid);
Al Viro2f1169e2009-01-02 08:16:51 -05001791 if (old_format_only(sb))
1792 make_le_item_head(&ih, NULL, KEY_FORMAT_3_5, SD_OFFSET,
1793 TYPE_STAT_DATA, SD_V1_SIZE, MAX_US_INT);
1794 else
1795 make_le_item_head(&ih, NULL, KEY_FORMAT_3_6, SD_OFFSET,
1796 TYPE_STAT_DATA, SD_SIZE, MAX_US_INT);
Al Viroc1eaa262008-12-30 02:03:58 -05001797 memcpy(INODE_PKEY(inode), &(ih.ih_key), KEY_SIZE);
1798 args.dirid = le32_to_cpu(ih.ih_key.k_dir_id);
1799 if (insert_inode_locked4(inode, args.objectid,
1800 reiserfs_find_actor, &args) < 0) {
1801 err = -EINVAL;
1802 goto out_bad_inode;
1803 }
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001804 if (old_format_only(sb))
Jeff Mahoney0222e652009-03-30 14:02:44 -04001805 /* not a perfect generation count, as object ids can be reused, but
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001806 ** this is as good as reiserfs can do right now.
1807 ** note that the private part of inode isn't filled in yet, we have
1808 ** to use the directory.
1809 */
1810 inode->i_generation = le32_to_cpu(INODE_PKEY(dir)->k_objectid);
1811 else
1812#if defined( USE_INODE_GENERATION_COUNTER )
1813 inode->i_generation =
1814 le32_to_cpu(REISERFS_SB(sb)->s_rs->s_inode_generation);
1815#else
1816 inode->i_generation = ++event;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001817#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001818
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001819 /* fill stat data */
1820 inode->i_nlink = (S_ISDIR(mode) ? 2 : 1);
1821
1822 /* uid and gid must already be set by the caller for quota init */
1823
1824 /* symlink cannot be immutable or append only, right? */
1825 if (S_ISLNK(inode->i_mode))
1826 inode->i_flags &= ~(S_IMMUTABLE | S_APPEND);
1827
1828 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME_SEC;
1829 inode->i_size = i_size;
1830 inode->i_blocks = 0;
1831 inode->i_bytes = 0;
1832 REISERFS_I(inode)->i_first_direct_byte = S_ISLNK(mode) ? 1 :
1833 U32_MAX /*NO_BYTES_IN_DIRECT_ITEM */ ;
1834
1835 INIT_LIST_HEAD(&(REISERFS_I(inode)->i_prealloc_list));
1836 REISERFS_I(inode)->i_flags = 0;
1837 REISERFS_I(inode)->i_prealloc_block = 0;
1838 REISERFS_I(inode)->i_prealloc_count = 0;
1839 REISERFS_I(inode)->i_trans_id = 0;
1840 REISERFS_I(inode)->i_jl = NULL;
1841 REISERFS_I(inode)->i_attrs =
1842 REISERFS_I(dir)->i_attrs & REISERFS_INHERIT_MASK;
1843 sd_attrs_to_i_attrs(REISERFS_I(inode)->i_attrs, inode);
Vladimir Savelievde145692007-01-22 20:40:46 -08001844 mutex_init(&(REISERFS_I(inode)->i_mmap));
Alexey Dobriyan068fbb32006-09-29 01:59:58 -07001845 reiserfs_init_xattr_rwsem(inode);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001846
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001847 /* key to search for correct place for new stat data */
1848 _make_cpu_key(&key, KEY_FORMAT_3_6, le32_to_cpu(ih.ih_key.k_dir_id),
1849 le32_to_cpu(ih.ih_key.k_objectid), SD_OFFSET,
1850 TYPE_STAT_DATA, 3 /*key length */ );
1851
1852 /* find proper place for inserting of stat data */
1853 retval = search_item(sb, &key, &path_to_key);
1854 if (retval == IO_ERROR) {
1855 err = -EIO;
1856 goto out_bad_inode;
1857 }
1858 if (retval == ITEM_FOUND) {
1859 pathrelse(&path_to_key);
1860 err = -EEXIST;
1861 goto out_bad_inode;
1862 }
1863 if (old_format_only(sb)) {
1864 if (inode->i_uid & ~0xffff || inode->i_gid & ~0xffff) {
1865 pathrelse(&path_to_key);
1866 /* i_uid or i_gid is too big to be stored in stat data v3.5 */
1867 err = -EINVAL;
1868 goto out_bad_inode;
1869 }
1870 inode2sd_v1(&sd, inode, inode->i_size);
1871 } else {
1872 inode2sd(&sd, inode, inode->i_size);
1873 }
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001874 // store in in-core inode the key of stat data and version all
1875 // object items will have (directory items will have old offset
1876 // format, other new objects will consist of new items)
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001877 if (old_format_only(sb) || S_ISDIR(mode) || S_ISLNK(mode))
1878 set_inode_item_key_version(inode, KEY_FORMAT_3_5);
1879 else
1880 set_inode_item_key_version(inode, KEY_FORMAT_3_6);
1881 if (old_format_only(sb))
1882 set_inode_sd_version(inode, STAT_DATA_V1);
1883 else
1884 set_inode_sd_version(inode, STAT_DATA_V2);
1885
1886 /* insert the stat data into the tree */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001887#ifdef DISPLACE_NEW_PACKING_LOCALITIES
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001888 if (REISERFS_I(dir)->new_packing_locality)
1889 th->displace_new_blocks = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001890#endif
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001891 retval =
1892 reiserfs_insert_item(th, &path_to_key, &key, &ih, inode,
1893 (char *)(&sd));
1894 if (retval) {
1895 err = retval;
1896 reiserfs_check_path(&path_to_key);
1897 goto out_bad_inode;
1898 }
1899#ifdef DISPLACE_NEW_PACKING_LOCALITIES
1900 if (!th->displace_new_blocks)
1901 REISERFS_I(dir)->new_packing_locality = 0;
1902#endif
1903 if (S_ISDIR(mode)) {
1904 /* insert item with "." and ".." */
1905 retval =
1906 reiserfs_new_directory(th, inode, &ih, &path_to_key, dir);
1907 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001908
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001909 if (S_ISLNK(mode)) {
1910 /* insert body of symlink */
1911 if (!old_format_only(sb))
1912 i_size = ROUND_UP(i_size);
1913 retval =
1914 reiserfs_new_symlink(th, inode, &ih, &path_to_key, symname,
1915 i_size);
1916 }
1917 if (retval) {
1918 err = retval;
1919 reiserfs_check_path(&path_to_key);
1920 journal_end(th, th->t_super, th->t_blocks_allocated);
1921 goto out_inserted_sd;
1922 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001923
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001924 if (reiserfs_posixacl(inode->i_sb)) {
Jeff Mahoney0ab26212009-03-30 14:02:39 -04001925 retval = reiserfs_inherit_default_acl(th, dir, dentry, inode);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001926 if (retval) {
1927 err = retval;
1928 reiserfs_check_path(&path_to_key);
1929 journal_end(th, th->t_super, th->t_blocks_allocated);
1930 goto out_inserted_sd;
1931 }
1932 } else if (inode->i_sb->s_flags & MS_POSIXACL) {
Jeff Mahoney45b03d52009-03-30 14:02:21 -04001933 reiserfs_warning(inode->i_sb, "jdm-13090",
1934 "ACLs aren't enabled in the fs, "
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001935 "but vfs thinks they are!");
Jeff Mahoney6dfede62009-03-30 14:02:32 -04001936 } else if (IS_PRIVATE(dir))
1937 inode->i_flags |= S_PRIVATE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001938
Jeff Mahoney57fe60d2009-03-30 14:02:41 -04001939 if (security->name) {
1940 retval = reiserfs_security_write(th, inode, security);
1941 if (retval) {
1942 err = retval;
1943 reiserfs_check_path(&path_to_key);
1944 retval = journal_end(th, th->t_super,
1945 th->t_blocks_allocated);
1946 if (retval)
1947 err = retval;
1948 goto out_inserted_sd;
1949 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001950 }
1951
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001952 reiserfs_update_sd(th, inode);
1953 reiserfs_check_path(&path_to_key);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001954
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001955 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001956
1957/* it looks like you can easily compress these two goto targets into
1958 * one. Keeping it like this doesn't actually hurt anything, and they
1959 * are place holders for what the quota code actually needs.
1960 */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001961 out_bad_inode:
1962 /* Invalidate the object, nothing was inserted yet */
1963 INODE_PKEY(inode)->k_objectid = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001964
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001965 /* Quota change must be inside a transaction for journaling */
Christoph Hellwig63936dd2010-03-03 09:05:01 -05001966 dquot_free_inode(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001967
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001968 out_end_trans:
1969 journal_end(th, th->t_super, th->t_blocks_allocated);
1970 /* Drop can be outside and it needs more credits so it's better to have it outside */
Christoph Hellwig9f754752010-03-03 09:05:05 -05001971 dquot_drop(inode);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001972 inode->i_flags |= S_NOQUOTA;
1973 make_bad_inode(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001974
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001975 out_inserted_sd:
1976 inode->i_nlink = 0;
1977 th->t_trans_id = 0; /* so the caller can't use this handle later */
Al Viroc1eaa262008-12-30 02:03:58 -05001978 unlock_new_inode(inode); /* OK to do even if we hadn't locked it */
Jeff Mahoneyd9845612009-03-30 14:02:35 -04001979 iput(inode);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001980 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001981}
1982
1983/*
1984** finds the tail page in the page cache,
1985** reads the last block in.
1986**
1987** On success, page_result is set to a locked, pinned page, and bh_result
1988** is set to an up to date buffer for the last block in the file. returns 0.
1989**
1990** tail conversion is not done, so bh_result might not be valid for writing
1991** check buffer_mapped(bh_result) and bh_result->b_blocknr != 0 before
1992** trying to write the block.
1993**
1994** on failure, nonzero is returned, page_result and bh_result are untouched.
1995*/
Jeff Mahoney995c7622009-03-30 14:02:47 -04001996static int grab_tail_page(struct inode *inode,
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07001997 struct page **page_result,
1998 struct buffer_head **bh_result)
1999{
Linus Torvalds1da177e2005-04-16 15:20:36 -07002000
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002001 /* we want the page with the last byte in the file,
2002 ** not the page that will hold the next byte for appending
2003 */
Jeff Mahoney995c7622009-03-30 14:02:47 -04002004 unsigned long index = (inode->i_size - 1) >> PAGE_CACHE_SHIFT;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002005 unsigned long pos = 0;
2006 unsigned long start = 0;
Jeff Mahoney995c7622009-03-30 14:02:47 -04002007 unsigned long blocksize = inode->i_sb->s_blocksize;
2008 unsigned long offset = (inode->i_size) & (PAGE_CACHE_SIZE - 1);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002009 struct buffer_head *bh;
2010 struct buffer_head *head;
2011 struct page *page;
2012 int error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002013
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002014 /* we know that we are only called with inode->i_size > 0.
2015 ** we also know that a file tail can never be as big as a block
2016 ** If i_size % blocksize == 0, our file is currently block aligned
2017 ** and it won't need converting or zeroing after a truncate.
2018 */
2019 if ((offset & (blocksize - 1)) == 0) {
2020 return -ENOENT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002021 }
Jeff Mahoney995c7622009-03-30 14:02:47 -04002022 page = grab_cache_page(inode->i_mapping, index);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002023 error = -ENOMEM;
2024 if (!page) {
2025 goto out;
2026 }
2027 /* start within the page of the last block in the file */
2028 start = (offset / blocksize) * blocksize;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002029
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002030 error = block_prepare_write(page, start, offset,
2031 reiserfs_get_block_create_0);
2032 if (error)
2033 goto unlock;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002034
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002035 head = page_buffers(page);
2036 bh = head;
2037 do {
2038 if (pos >= start) {
2039 break;
2040 }
2041 bh = bh->b_this_page;
2042 pos += blocksize;
2043 } while (bh != head);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002044
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002045 if (!buffer_uptodate(bh)) {
2046 /* note, this should never happen, prepare_write should
2047 ** be taking care of this for us. If the buffer isn't up to date,
2048 ** I've screwed up the code to find the buffer, or the code to
2049 ** call prepare_write
2050 */
Jeff Mahoney995c7622009-03-30 14:02:47 -04002051 reiserfs_error(inode->i_sb, "clm-6000",
Jeff Mahoney0030b642009-03-30 14:02:28 -04002052 "error reading block %lu", bh->b_blocknr);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002053 error = -EIO;
2054 goto unlock;
2055 }
2056 *bh_result = bh;
2057 *page_result = page;
2058
2059 out:
2060 return error;
2061
2062 unlock:
2063 unlock_page(page);
2064 page_cache_release(page);
2065 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002066}
2067
2068/*
2069** vfs version of truncate file. Must NOT be called with
2070** a transaction already started.
2071**
2072** some code taken from block_truncate_page
2073*/
Jeff Mahoney995c7622009-03-30 14:02:47 -04002074int reiserfs_truncate_file(struct inode *inode, int update_timestamps)
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002075{
2076 struct reiserfs_transaction_handle th;
2077 /* we want the offset for the first byte after the end of the file */
Jeff Mahoney995c7622009-03-30 14:02:47 -04002078 unsigned long offset = inode->i_size & (PAGE_CACHE_SIZE - 1);
2079 unsigned blocksize = inode->i_sb->s_blocksize;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002080 unsigned length;
2081 struct page *page = NULL;
2082 int error;
2083 struct buffer_head *bh = NULL;
Jeff Mahoney24996042005-12-14 14:38:05 -05002084 int err2;
Frederic Weisbecker22c963a2009-04-14 05:34:24 +02002085 int lock_depth;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002086
Frederic Weisbecker22c963a2009-04-14 05:34:24 +02002087 lock_depth = reiserfs_write_lock_once(inode->i_sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002088
Jeff Mahoney995c7622009-03-30 14:02:47 -04002089 if (inode->i_size > 0) {
2090 error = grab_tail_page(inode, &page, &bh);
2091 if (error) {
Jeff Mahoney0222e652009-03-30 14:02:44 -04002092 // -ENOENT means we truncated past the end of the file,
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002093 // and get_block_create_0 could not find a block to read in,
2094 // which is ok.
2095 if (error != -ENOENT)
Jeff Mahoney995c7622009-03-30 14:02:47 -04002096 reiserfs_error(inode->i_sb, "clm-6001",
Jeff Mahoney0030b642009-03-30 14:02:28 -04002097 "grab_tail_page failed %d",
2098 error);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002099 page = NULL;
2100 bh = NULL;
2101 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002102 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002103
Jeff Mahoney0222e652009-03-30 14:02:44 -04002104 /* so, if page != NULL, we have a buffer head for the offset at
2105 ** the end of the file. if the bh is mapped, and bh->b_blocknr != 0,
2106 ** then we have an unformatted node. Otherwise, we have a direct item,
2107 ** and no zeroing is required on disk. We zero after the truncate,
2108 ** because the truncate might pack the item anyway
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002109 ** (it will unmap bh if it packs).
2110 */
2111 /* it is enough to reserve space in transaction for 2 balancings:
2112 one for "save" link adding and another for the first
2113 cut_from_item. 1 is for update_sd */
Jeff Mahoney995c7622009-03-30 14:02:47 -04002114 error = journal_begin(&th, inode->i_sb,
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002115 JOURNAL_PER_BALANCE_CNT * 2 + 1);
2116 if (error)
2117 goto out;
Jeff Mahoney995c7622009-03-30 14:02:47 -04002118 reiserfs_update_inode_transaction(inode);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002119 if (update_timestamps)
2120 /* we are doing real truncate: if the system crashes before the last
2121 transaction of truncating gets committed - on reboot the file
2122 either appears truncated properly or not truncated at all */
Jeff Mahoney995c7622009-03-30 14:02:47 -04002123 add_save_link(&th, inode, 1);
2124 err2 = reiserfs_do_truncate(&th, inode, page, update_timestamps);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002125 error =
Jeff Mahoney995c7622009-03-30 14:02:47 -04002126 journal_end(&th, inode->i_sb, JOURNAL_PER_BALANCE_CNT * 2 + 1);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002127 if (error)
2128 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002129
Jeff Mahoney24996042005-12-14 14:38:05 -05002130 /* check reiserfs_do_truncate after ending the transaction */
2131 if (err2) {
2132 error = err2;
2133 goto out;
2134 }
2135
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002136 if (update_timestamps) {
Jeff Mahoney995c7622009-03-30 14:02:47 -04002137 error = remove_save_link(inode, 1 /* truncate */);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002138 if (error)
2139 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002140 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002141
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002142 if (page) {
2143 length = offset & (blocksize - 1);
2144 /* if we are not on a block boundary */
2145 if (length) {
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002146 length = blocksize - length;
Christoph Lametereebd2aa2008-02-04 22:28:29 -08002147 zero_user(page, offset, length);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002148 if (buffer_mapped(bh) && bh->b_blocknr != 0) {
2149 mark_buffer_dirty(bh);
2150 }
2151 }
2152 unlock_page(page);
2153 page_cache_release(page);
2154 }
2155
Frederic Weisbecker22c963a2009-04-14 05:34:24 +02002156 reiserfs_write_unlock_once(inode->i_sb, lock_depth);
2157
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002158 return 0;
2159 out:
2160 if (page) {
2161 unlock_page(page);
2162 page_cache_release(page);
2163 }
Frederic Weisbecker22c963a2009-04-14 05:34:24 +02002164
2165 reiserfs_write_unlock_once(inode->i_sb, lock_depth);
2166
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002167 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002168}
2169
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002170static int map_block_for_writepage(struct inode *inode,
2171 struct buffer_head *bh_result,
2172 unsigned long block)
2173{
2174 struct reiserfs_transaction_handle th;
2175 int fs_gen;
2176 struct item_head tmp_ih;
2177 struct item_head *ih;
2178 struct buffer_head *bh;
2179 __le32 *item;
2180 struct cpu_key key;
2181 INITIALIZE_PATH(path);
2182 int pos_in_item;
2183 int jbegin_count = JOURNAL_PER_BALANCE_CNT;
Oleg Drokin7729ac52005-11-28 13:43:53 -08002184 loff_t byte_offset = ((loff_t)block << inode->i_sb->s_blocksize_bits)+1;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002185 int retval;
2186 int use_get_block = 0;
2187 int bytes_copied = 0;
2188 int copy_size;
2189 int trans_running = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002190
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002191 /* catch places below that try to log something without starting a trans */
2192 th.t_trans_id = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002193
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002194 if (!buffer_uptodate(bh_result)) {
2195 return -EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002196 }
2197
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002198 kmap(bh_result->b_page);
2199 start_over:
2200 reiserfs_write_lock(inode->i_sb);
2201 make_cpu_key(&key, inode, byte_offset, TYPE_ANY, 3);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002202
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002203 research:
2204 retval = search_for_position_by_key(inode->i_sb, &key, &path);
2205 if (retval != POSITION_FOUND) {
2206 use_get_block = 1;
2207 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002208 }
2209
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002210 bh = get_last_bh(&path);
2211 ih = get_ih(&path);
2212 item = get_item(&path);
2213 pos_in_item = path.pos_in_item;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002214
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002215 /* we've found an unformatted node */
2216 if (indirect_item_found(retval, ih)) {
2217 if (bytes_copied > 0) {
Jeff Mahoney45b03d52009-03-30 14:02:21 -04002218 reiserfs_warning(inode->i_sb, "clm-6002",
2219 "bytes_copied %d", bytes_copied);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002220 }
2221 if (!get_block_num(item, pos_in_item)) {
2222 /* crap, we are writing to a hole */
2223 use_get_block = 1;
2224 goto out;
2225 }
2226 set_block_dev_mapped(bh_result,
2227 get_block_num(item, pos_in_item), inode);
2228 } else if (is_direct_le_ih(ih)) {
2229 char *p;
2230 p = page_address(bh_result->b_page);
2231 p += (byte_offset - 1) & (PAGE_CACHE_SIZE - 1);
2232 copy_size = ih_item_len(ih) - pos_in_item;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002233
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002234 fs_gen = get_generation(inode->i_sb);
2235 copy_item_head(&tmp_ih, ih);
2236
2237 if (!trans_running) {
2238 /* vs-3050 is gone, no need to drop the path */
2239 retval = journal_begin(&th, inode->i_sb, jbegin_count);
2240 if (retval)
2241 goto out;
2242 reiserfs_update_inode_transaction(inode);
2243 trans_running = 1;
2244 if (fs_changed(fs_gen, inode->i_sb)
2245 && item_moved(&tmp_ih, &path)) {
2246 reiserfs_restore_prepared_buffer(inode->i_sb,
2247 bh);
2248 goto research;
2249 }
2250 }
2251
2252 reiserfs_prepare_for_journal(inode->i_sb, bh, 1);
2253
2254 if (fs_changed(fs_gen, inode->i_sb)
2255 && item_moved(&tmp_ih, &path)) {
2256 reiserfs_restore_prepared_buffer(inode->i_sb, bh);
2257 goto research;
2258 }
2259
2260 memcpy(B_I_PITEM(bh, ih) + pos_in_item, p + bytes_copied,
2261 copy_size);
2262
2263 journal_mark_dirty(&th, inode->i_sb, bh);
2264 bytes_copied += copy_size;
2265 set_block_dev_mapped(bh_result, 0, inode);
2266
2267 /* are there still bytes left? */
2268 if (bytes_copied < bh_result->b_size &&
2269 (byte_offset + bytes_copied) < inode->i_size) {
2270 set_cpu_key_k_offset(&key,
2271 cpu_key_k_offset(&key) +
2272 copy_size);
2273 goto research;
2274 }
2275 } else {
Jeff Mahoney45b03d52009-03-30 14:02:21 -04002276 reiserfs_warning(inode->i_sb, "clm-6003",
2277 "bad item inode %lu", inode->i_ino);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002278 retval = -EIO;
2279 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002280 }
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002281 retval = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002282
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002283 out:
2284 pathrelse(&path);
2285 if (trans_running) {
2286 int err = journal_end(&th, inode->i_sb, jbegin_count);
2287 if (err)
2288 retval = err;
2289 trans_running = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002290 }
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002291 reiserfs_write_unlock(inode->i_sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002292
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002293 /* this is where we fill in holes in the file. */
2294 if (use_get_block) {
2295 retval = reiserfs_get_block(inode, block, bh_result,
Jes Sorensen1b1dcc12006-01-09 15:59:24 -08002296 GET_BLOCK_CREATE | GET_BLOCK_NO_IMUX
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002297 | GET_BLOCK_NO_DANGLE);
2298 if (!retval) {
2299 if (!buffer_mapped(bh_result)
2300 || bh_result->b_blocknr == 0) {
2301 /* get_block failed to find a mapped unformatted node. */
2302 use_get_block = 0;
2303 goto start_over;
2304 }
2305 }
2306 }
2307 kunmap(bh_result->b_page);
2308
2309 if (!retval && buffer_mapped(bh_result) && bh_result->b_blocknr == 0) {
2310 /* we've copied data from the page into the direct item, so the
2311 * buffer in the page is now clean, mark it to reflect that.
2312 */
2313 lock_buffer(bh_result);
2314 clear_buffer_dirty(bh_result);
2315 unlock_buffer(bh_result);
2316 }
2317 return retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002318}
2319
Jeff Mahoney0222e652009-03-30 14:02:44 -04002320/*
2321 * mason@suse.com: updated in 2.5.54 to follow the same general io
Linus Torvalds1da177e2005-04-16 15:20:36 -07002322 * start/recovery path as __block_write_full_page, along with special
2323 * code to handle reiserfs tails.
2324 */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002325static int reiserfs_write_full_page(struct page *page,
2326 struct writeback_control *wbc)
2327{
2328 struct inode *inode = page->mapping->host;
2329 unsigned long end_index = inode->i_size >> PAGE_CACHE_SHIFT;
2330 int error = 0;
2331 unsigned long block;
Chris Masonb4c76fa2006-08-05 12:15:10 -07002332 sector_t last_block;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002333 struct buffer_head *head, *bh;
2334 int partial = 0;
2335 int nr = 0;
2336 int checked = PageChecked(page);
2337 struct reiserfs_transaction_handle th;
2338 struct super_block *s = inode->i_sb;
2339 int bh_per_page = PAGE_CACHE_SIZE / s->s_blocksize;
2340 th.t_trans_id = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002341
Chris Masone0e851c2006-02-01 03:06:49 -08002342 /* no logging allowed when nonblocking or from PF_MEMALLOC */
2343 if (checked && (current->flags & PF_MEMALLOC)) {
2344 redirty_page_for_writepage(wbc, page);
2345 unlock_page(page);
2346 return 0;
2347 }
2348
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002349 /* The page dirty bit is cleared before writepage is called, which
2350 * means we have to tell create_empty_buffers to make dirty buffers
2351 * The page really should be up to date at this point, so tossing
2352 * in the BH_Uptodate is just a sanity check.
2353 */
2354 if (!page_has_buffers(page)) {
2355 create_empty_buffers(page, s->s_blocksize,
2356 (1 << BH_Dirty) | (1 << BH_Uptodate));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002357 }
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002358 head = page_buffers(page);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002359
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002360 /* last page in the file, zero out any contents past the
2361 ** last byte in the file
2362 */
2363 if (page->index >= end_index) {
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002364 unsigned last_offset;
2365
2366 last_offset = inode->i_size & (PAGE_CACHE_SIZE - 1);
2367 /* no file contents in this page */
2368 if (page->index >= end_index + 1 || !last_offset) {
2369 unlock_page(page);
2370 return 0;
2371 }
Christoph Lametereebd2aa2008-02-04 22:28:29 -08002372 zero_user_segment(page, last_offset, PAGE_CACHE_SIZE);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002373 }
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002374 bh = head;
2375 block = page->index << (PAGE_CACHE_SHIFT - s->s_blocksize_bits);
Chris Masonb4c76fa2006-08-05 12:15:10 -07002376 last_block = (i_size_read(inode) - 1) >> inode->i_blkbits;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002377 /* first map all the buffers, logging any direct items we find */
2378 do {
Chris Masonb4c76fa2006-08-05 12:15:10 -07002379 if (block > last_block) {
2380 /*
2381 * This can happen when the block size is less than
2382 * the page size. The corresponding bytes in the page
2383 * were zero filled above
2384 */
2385 clear_buffer_dirty(bh);
2386 set_buffer_uptodate(bh);
2387 } else if ((checked || buffer_dirty(bh)) &&
2388 (!buffer_mapped(bh) || (buffer_mapped(bh)
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002389 && bh->b_blocknr ==
2390 0))) {
2391 /* not mapped yet, or it points to a direct item, search
2392 * the btree for the mapping info, and log any direct
2393 * items found
2394 */
2395 if ((error = map_block_for_writepage(inode, bh, block))) {
2396 goto fail;
2397 }
2398 }
2399 bh = bh->b_this_page;
2400 block++;
2401 } while (bh != head);
2402
2403 /*
2404 * we start the transaction after map_block_for_writepage,
2405 * because it can create holes in the file (an unbounded operation).
2406 * starting it here, we can make a reliable estimate for how many
2407 * blocks we're going to log
2408 */
2409 if (checked) {
2410 ClearPageChecked(page);
2411 reiserfs_write_lock(s);
2412 error = journal_begin(&th, s, bh_per_page + 1);
2413 if (error) {
2414 reiserfs_write_unlock(s);
2415 goto fail;
2416 }
2417 reiserfs_update_inode_transaction(inode);
2418 }
2419 /* now go through and lock any dirty buffers on the page */
2420 do {
2421 get_bh(bh);
2422 if (!buffer_mapped(bh))
2423 continue;
2424 if (buffer_mapped(bh) && bh->b_blocknr == 0)
2425 continue;
2426
2427 if (checked) {
2428 reiserfs_prepare_for_journal(s, bh, 1);
2429 journal_mark_dirty(&th, s, bh);
2430 continue;
2431 }
2432 /* from this point on, we know the buffer is mapped to a
2433 * real block and not a direct item
2434 */
2435 if (wbc->sync_mode != WB_SYNC_NONE || !wbc->nonblocking) {
2436 lock_buffer(bh);
2437 } else {
Nick Pigginca5de402008-08-02 12:02:13 +02002438 if (!trylock_buffer(bh)) {
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002439 redirty_page_for_writepage(wbc, page);
2440 continue;
2441 }
2442 }
2443 if (test_clear_buffer_dirty(bh)) {
2444 mark_buffer_async_write(bh);
2445 } else {
2446 unlock_buffer(bh);
2447 }
2448 } while ((bh = bh->b_this_page) != head);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002449
2450 if (checked) {
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002451 error = journal_end(&th, s, bh_per_page + 1);
2452 reiserfs_write_unlock(s);
2453 if (error)
2454 goto fail;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002455 }
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002456 BUG_ON(PageWriteback(page));
2457 set_page_writeback(page);
2458 unlock_page(page);
2459
2460 /*
Jeff Mahoney0222e652009-03-30 14:02:44 -04002461 * since any buffer might be the only dirty buffer on the page,
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002462 * the first submit_bh can bring the page out of writeback.
2463 * be careful with the buffers.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002464 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002465 do {
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002466 struct buffer_head *next = bh->b_this_page;
2467 if (buffer_async_write(bh)) {
2468 submit_bh(WRITE, bh);
2469 nr++;
2470 }
2471 put_bh(bh);
2472 bh = next;
2473 } while (bh != head);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002474
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002475 error = 0;
2476 done:
2477 if (nr == 0) {
2478 /*
2479 * if this page only had a direct item, it is very possible for
Jeff Mahoney0222e652009-03-30 14:02:44 -04002480 * no io to be required without there being an error. Or,
2481 * someone else could have locked them and sent them down the
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002482 * pipe without locking the page
2483 */
2484 bh = head;
2485 do {
2486 if (!buffer_uptodate(bh)) {
2487 partial = 1;
2488 break;
2489 }
2490 bh = bh->b_this_page;
2491 } while (bh != head);
2492 if (!partial)
2493 SetPageUptodate(page);
2494 end_page_writeback(page);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002495 }
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002496 return error;
2497
2498 fail:
2499 /* catches various errors, we need to make sure any valid dirty blocks
Jeff Mahoney0222e652009-03-30 14:02:44 -04002500 * get to the media. The page is currently locked and not marked for
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002501 * writeback
2502 */
2503 ClearPageUptodate(page);
2504 bh = head;
2505 do {
2506 get_bh(bh);
2507 if (buffer_mapped(bh) && buffer_dirty(bh) && bh->b_blocknr) {
2508 lock_buffer(bh);
2509 mark_buffer_async_write(bh);
2510 } else {
2511 /*
2512 * clear any dirty bits that might have come from getting
2513 * attached to a dirty page
2514 */
2515 clear_buffer_dirty(bh);
2516 }
2517 bh = bh->b_this_page;
2518 } while (bh != head);
2519 SetPageError(page);
2520 BUG_ON(PageWriteback(page));
2521 set_page_writeback(page);
2522 unlock_page(page);
2523 do {
2524 struct buffer_head *next = bh->b_this_page;
2525 if (buffer_async_write(bh)) {
2526 clear_buffer_dirty(bh);
2527 submit_bh(WRITE, bh);
2528 nr++;
2529 }
2530 put_bh(bh);
2531 bh = next;
2532 } while (bh != head);
2533 goto done;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002534}
2535
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002536static int reiserfs_readpage(struct file *f, struct page *page)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002537{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002538 return block_read_full_page(page, reiserfs_get_block);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002539}
2540
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002541static int reiserfs_writepage(struct page *page, struct writeback_control *wbc)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002542{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002543 struct inode *inode = page->mapping->host;
2544 reiserfs_wait_on_write_block(inode->i_sb);
2545 return reiserfs_write_full_page(page, wbc);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002546}
2547
Jan Karaec8e2f72009-12-17 15:27:06 -08002548static void reiserfs_truncate_failed_write(struct inode *inode)
2549{
2550 truncate_inode_pages(inode->i_mapping, inode->i_size);
2551 reiserfs_truncate_file(inode, 0);
2552}
2553
Vladimir Savelievba9d8ce2007-10-16 01:25:14 -07002554static int reiserfs_write_begin(struct file *file,
2555 struct address_space *mapping,
2556 loff_t pos, unsigned len, unsigned flags,
2557 struct page **pagep, void **fsdata)
2558{
2559 struct inode *inode;
2560 struct page *page;
2561 pgoff_t index;
2562 int ret;
2563 int old_ref = 0;
2564
Vladimir Savelievf7557e82007-10-16 01:25:14 -07002565 inode = mapping->host;
2566 *fsdata = 0;
2567 if (flags & AOP_FLAG_CONT_EXPAND &&
2568 (pos & (inode->i_sb->s_blocksize - 1)) == 0) {
2569 pos ++;
2570 *fsdata = (void *)(unsigned long)flags;
2571 }
2572
Vladimir Savelievba9d8ce2007-10-16 01:25:14 -07002573 index = pos >> PAGE_CACHE_SHIFT;
Nick Piggin54566b22009-01-04 12:00:53 -08002574 page = grab_cache_page_write_begin(mapping, index, flags);
Vladimir Savelievba9d8ce2007-10-16 01:25:14 -07002575 if (!page)
2576 return -ENOMEM;
2577 *pagep = page;
2578
Vladimir Savelievba9d8ce2007-10-16 01:25:14 -07002579 reiserfs_wait_on_write_block(inode->i_sb);
2580 fix_tail_page_for_writing(page);
2581 if (reiserfs_transaction_running(inode->i_sb)) {
2582 struct reiserfs_transaction_handle *th;
2583 th = (struct reiserfs_transaction_handle *)current->
2584 journal_info;
2585 BUG_ON(!th->t_refcount);
2586 BUG_ON(!th->t_trans_id);
2587 old_ref = th->t_refcount;
2588 th->t_refcount++;
2589 }
2590 ret = block_write_begin(file, mapping, pos, len, flags, pagep, fsdata,
2591 reiserfs_get_block);
2592 if (ret && reiserfs_transaction_running(inode->i_sb)) {
2593 struct reiserfs_transaction_handle *th = current->journal_info;
2594 /* this gets a little ugly. If reiserfs_get_block returned an
2595 * error and left a transacstion running, we've got to close it,
2596 * and we've got to free handle if it was a persistent transaction.
2597 *
2598 * But, if we had nested into an existing transaction, we need
2599 * to just drop the ref count on the handle.
2600 *
2601 * If old_ref == 0, the transaction is from reiserfs_get_block,
2602 * and it was a persistent trans. Otherwise, it was nested above.
2603 */
2604 if (th->t_refcount > old_ref) {
2605 if (old_ref)
2606 th->t_refcount--;
2607 else {
2608 int err;
2609 reiserfs_write_lock(inode->i_sb);
2610 err = reiserfs_end_persistent_transaction(th);
2611 reiserfs_write_unlock(inode->i_sb);
2612 if (err)
2613 ret = err;
2614 }
2615 }
2616 }
2617 if (ret) {
2618 unlock_page(page);
2619 page_cache_release(page);
Jan Karaec8e2f72009-12-17 15:27:06 -08002620 /* Truncate allocated blocks */
2621 reiserfs_truncate_failed_write(inode);
Vladimir Savelievba9d8ce2007-10-16 01:25:14 -07002622 }
2623 return ret;
2624}
2625
2626int reiserfs_prepare_write(struct file *f, struct page *page,
2627 unsigned from, unsigned to)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002628{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002629 struct inode *inode = page->mapping->host;
2630 int ret;
2631 int old_ref = 0;
2632
Frederic Weisbecker8ebc4232009-04-07 04:19:49 +02002633 reiserfs_write_unlock(inode->i_sb);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002634 reiserfs_wait_on_write_block(inode->i_sb);
Frederic Weisbecker8ebc4232009-04-07 04:19:49 +02002635 reiserfs_write_lock(inode->i_sb);
2636
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002637 fix_tail_page_for_writing(page);
2638 if (reiserfs_transaction_running(inode->i_sb)) {
2639 struct reiserfs_transaction_handle *th;
2640 th = (struct reiserfs_transaction_handle *)current->
2641 journal_info;
2642 BUG_ON(!th->t_refcount);
2643 BUG_ON(!th->t_trans_id);
2644 old_ref = th->t_refcount;
2645 th->t_refcount++;
2646 }
2647
2648 ret = block_prepare_write(page, from, to, reiserfs_get_block);
2649 if (ret && reiserfs_transaction_running(inode->i_sb)) {
2650 struct reiserfs_transaction_handle *th = current->journal_info;
2651 /* this gets a little ugly. If reiserfs_get_block returned an
2652 * error and left a transacstion running, we've got to close it,
2653 * and we've got to free handle if it was a persistent transaction.
2654 *
2655 * But, if we had nested into an existing transaction, we need
2656 * to just drop the ref count on the handle.
2657 *
2658 * If old_ref == 0, the transaction is from reiserfs_get_block,
2659 * and it was a persistent trans. Otherwise, it was nested above.
2660 */
2661 if (th->t_refcount > old_ref) {
2662 if (old_ref)
2663 th->t_refcount--;
2664 else {
2665 int err;
2666 reiserfs_write_lock(inode->i_sb);
2667 err = reiserfs_end_persistent_transaction(th);
2668 reiserfs_write_unlock(inode->i_sb);
2669 if (err)
2670 ret = err;
2671 }
2672 }
2673 }
2674 return ret;
2675
2676}
2677
2678static sector_t reiserfs_aop_bmap(struct address_space *as, sector_t block)
2679{
2680 return generic_block_bmap(as, block, reiserfs_bmap);
2681}
2682
Vladimir Savelievba9d8ce2007-10-16 01:25:14 -07002683static int reiserfs_write_end(struct file *file, struct address_space *mapping,
2684 loff_t pos, unsigned len, unsigned copied,
2685 struct page *page, void *fsdata)
2686{
2687 struct inode *inode = page->mapping->host;
2688 int ret = 0;
2689 int update_sd = 0;
2690 struct reiserfs_transaction_handle *th;
2691 unsigned start;
Frederic Weisbeckerd6f5b0a2009-05-08 14:53:52 +02002692 int lock_depth = 0;
2693 bool locked = false;
Vladimir Savelievba9d8ce2007-10-16 01:25:14 -07002694
Vladimir Savelievf7557e82007-10-16 01:25:14 -07002695 if ((unsigned long)fsdata & AOP_FLAG_CONT_EXPAND)
2696 pos ++;
Vladimir Savelievba9d8ce2007-10-16 01:25:14 -07002697
2698 reiserfs_wait_on_write_block(inode->i_sb);
2699 if (reiserfs_transaction_running(inode->i_sb))
2700 th = current->journal_info;
2701 else
2702 th = NULL;
2703
2704 start = pos & (PAGE_CACHE_SIZE - 1);
2705 if (unlikely(copied < len)) {
2706 if (!PageUptodate(page))
2707 copied = 0;
2708
2709 page_zero_new_buffers(page, start + copied, start + len);
2710 }
2711 flush_dcache_page(page);
2712
2713 reiserfs_commit_page(inode, page, start, start + copied);
2714
2715 /* generic_commit_write does this for us, but does not update the
2716 ** transaction tracking stuff when the size changes. So, we have
2717 ** to do the i_size updates here.
2718 */
Jan Karaec8e2f72009-12-17 15:27:06 -08002719 if (pos + copied > inode->i_size) {
Vladimir Savelievba9d8ce2007-10-16 01:25:14 -07002720 struct reiserfs_transaction_handle myth;
Frederic Weisbeckerd6f5b0a2009-05-08 14:53:52 +02002721 lock_depth = reiserfs_write_lock_once(inode->i_sb);
2722 locked = true;
Vladimir Savelievba9d8ce2007-10-16 01:25:14 -07002723 /* If the file have grown beyond the border where it
2724 can have a tail, unmark it as needing a tail
2725 packing */
2726 if ((have_large_tails(inode->i_sb)
2727 && inode->i_size > i_block_size(inode) * 4)
2728 || (have_small_tails(inode->i_sb)
2729 && inode->i_size > i_block_size(inode)))
2730 REISERFS_I(inode)->i_flags &= ~i_pack_on_close_mask;
2731
2732 ret = journal_begin(&myth, inode->i_sb, 1);
Frederic Weisbeckerd6f5b0a2009-05-08 14:53:52 +02002733 if (ret)
Vladimir Savelievba9d8ce2007-10-16 01:25:14 -07002734 goto journal_error;
Frederic Weisbeckerd6f5b0a2009-05-08 14:53:52 +02002735
Vladimir Savelievba9d8ce2007-10-16 01:25:14 -07002736 reiserfs_update_inode_transaction(inode);
Jan Karaec8e2f72009-12-17 15:27:06 -08002737 inode->i_size = pos + copied;
Vladimir Savelievba9d8ce2007-10-16 01:25:14 -07002738 /*
2739 * this will just nest into our transaction. It's important
2740 * to use mark_inode_dirty so the inode gets pushed around on the
2741 * dirty lists, and so that O_SYNC works as expected
2742 */
2743 mark_inode_dirty(inode);
2744 reiserfs_update_sd(&myth, inode);
2745 update_sd = 1;
2746 ret = journal_end(&myth, inode->i_sb, 1);
Vladimir Savelievba9d8ce2007-10-16 01:25:14 -07002747 if (ret)
2748 goto journal_error;
2749 }
2750 if (th) {
Frederic Weisbeckerd6f5b0a2009-05-08 14:53:52 +02002751 if (!locked) {
2752 lock_depth = reiserfs_write_lock_once(inode->i_sb);
2753 locked = true;
2754 }
Vladimir Savelievba9d8ce2007-10-16 01:25:14 -07002755 if (!update_sd)
2756 mark_inode_dirty(inode);
2757 ret = reiserfs_end_persistent_transaction(th);
Vladimir Savelievba9d8ce2007-10-16 01:25:14 -07002758 if (ret)
2759 goto out;
2760 }
2761
2762 out:
Frederic Weisbeckerd6f5b0a2009-05-08 14:53:52 +02002763 if (locked)
2764 reiserfs_write_unlock_once(inode->i_sb, lock_depth);
Vladimir Savelievba9d8ce2007-10-16 01:25:14 -07002765 unlock_page(page);
2766 page_cache_release(page);
Jan Karaec8e2f72009-12-17 15:27:06 -08002767
2768 if (pos + len > inode->i_size)
2769 reiserfs_truncate_failed_write(inode);
2770
Vladimir Savelievba9d8ce2007-10-16 01:25:14 -07002771 return ret == 0 ? copied : ret;
2772
2773 journal_error:
Frederic Weisbeckerd6f5b0a2009-05-08 14:53:52 +02002774 reiserfs_write_unlock_once(inode->i_sb, lock_depth);
2775 locked = false;
Vladimir Savelievba9d8ce2007-10-16 01:25:14 -07002776 if (th) {
Vladimir Savelievba9d8ce2007-10-16 01:25:14 -07002777 if (!update_sd)
2778 reiserfs_update_sd(th, inode);
2779 ret = reiserfs_end_persistent_transaction(th);
Vladimir Savelievba9d8ce2007-10-16 01:25:14 -07002780 }
Vladimir Savelievba9d8ce2007-10-16 01:25:14 -07002781 goto out;
2782}
2783
2784int reiserfs_commit_write(struct file *f, struct page *page,
2785 unsigned from, unsigned to)
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002786{
2787 struct inode *inode = page->mapping->host;
2788 loff_t pos = ((loff_t) page->index << PAGE_CACHE_SHIFT) + to;
2789 int ret = 0;
2790 int update_sd = 0;
2791 struct reiserfs_transaction_handle *th = NULL;
2792
Frederic Weisbecker8ebc4232009-04-07 04:19:49 +02002793 reiserfs_write_unlock(inode->i_sb);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002794 reiserfs_wait_on_write_block(inode->i_sb);
Frederic Weisbecker8ebc4232009-04-07 04:19:49 +02002795 reiserfs_write_lock(inode->i_sb);
2796
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002797 if (reiserfs_transaction_running(inode->i_sb)) {
2798 th = current->journal_info;
2799 }
2800 reiserfs_commit_page(inode, page, from, to);
2801
2802 /* generic_commit_write does this for us, but does not update the
2803 ** transaction tracking stuff when the size changes. So, we have
2804 ** to do the i_size updates here.
2805 */
2806 if (pos > inode->i_size) {
2807 struct reiserfs_transaction_handle myth;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002808 /* If the file have grown beyond the border where it
2809 can have a tail, unmark it as needing a tail
2810 packing */
2811 if ((have_large_tails(inode->i_sb)
2812 && inode->i_size > i_block_size(inode) * 4)
2813 || (have_small_tails(inode->i_sb)
2814 && inode->i_size > i_block_size(inode)))
2815 REISERFS_I(inode)->i_flags &= ~i_pack_on_close_mask;
2816
2817 ret = journal_begin(&myth, inode->i_sb, 1);
Frederic Weisbecker7e942772009-08-25 03:38:12 +02002818 if (ret)
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002819 goto journal_error;
Frederic Weisbecker7e942772009-08-25 03:38:12 +02002820
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002821 reiserfs_update_inode_transaction(inode);
2822 inode->i_size = pos;
Chris Mason9f037832005-09-13 01:25:17 -07002823 /*
2824 * this will just nest into our transaction. It's important
2825 * to use mark_inode_dirty so the inode gets pushed around on the
2826 * dirty lists, and so that O_SYNC works as expected
2827 */
2828 mark_inode_dirty(inode);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002829 reiserfs_update_sd(&myth, inode);
2830 update_sd = 1;
2831 ret = journal_end(&myth, inode->i_sb, 1);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002832 if (ret)
2833 goto journal_error;
2834 }
2835 if (th) {
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002836 if (!update_sd)
Chris Mason9f037832005-09-13 01:25:17 -07002837 mark_inode_dirty(inode);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002838 ret = reiserfs_end_persistent_transaction(th);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002839 if (ret)
2840 goto out;
2841 }
2842
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002843 out:
2844 return ret;
2845
2846 journal_error:
2847 if (th) {
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002848 if (!update_sd)
2849 reiserfs_update_sd(th, inode);
2850 ret = reiserfs_end_persistent_transaction(th);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002851 }
2852
2853 return ret;
2854}
2855
2856void sd_attrs_to_i_attrs(__u16 sd_attrs, struct inode *inode)
2857{
2858 if (reiserfs_attrs(inode->i_sb)) {
2859 if (sd_attrs & REISERFS_SYNC_FL)
2860 inode->i_flags |= S_SYNC;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002861 else
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002862 inode->i_flags &= ~S_SYNC;
2863 if (sd_attrs & REISERFS_IMMUTABLE_FL)
2864 inode->i_flags |= S_IMMUTABLE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002865 else
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002866 inode->i_flags &= ~S_IMMUTABLE;
2867 if (sd_attrs & REISERFS_APPEND_FL)
2868 inode->i_flags |= S_APPEND;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002869 else
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002870 inode->i_flags &= ~S_APPEND;
2871 if (sd_attrs & REISERFS_NOATIME_FL)
2872 inode->i_flags |= S_NOATIME;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002873 else
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002874 inode->i_flags &= ~S_NOATIME;
2875 if (sd_attrs & REISERFS_NOTAIL_FL)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002876 REISERFS_I(inode)->i_flags |= i_nopack_mask;
2877 else
2878 REISERFS_I(inode)->i_flags &= ~i_nopack_mask;
2879 }
2880}
2881
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002882void i_attrs_to_sd_attrs(struct inode *inode, __u16 * sd_attrs)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002883{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002884 if (reiserfs_attrs(inode->i_sb)) {
2885 if (inode->i_flags & S_IMMUTABLE)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002886 *sd_attrs |= REISERFS_IMMUTABLE_FL;
2887 else
2888 *sd_attrs &= ~REISERFS_IMMUTABLE_FL;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002889 if (inode->i_flags & S_SYNC)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002890 *sd_attrs |= REISERFS_SYNC_FL;
2891 else
2892 *sd_attrs &= ~REISERFS_SYNC_FL;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002893 if (inode->i_flags & S_NOATIME)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002894 *sd_attrs |= REISERFS_NOATIME_FL;
2895 else
2896 *sd_attrs &= ~REISERFS_NOATIME_FL;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002897 if (REISERFS_I(inode)->i_flags & i_nopack_mask)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002898 *sd_attrs |= REISERFS_NOTAIL_FL;
2899 else
2900 *sd_attrs &= ~REISERFS_NOTAIL_FL;
2901 }
2902}
2903
2904/* decide if this buffer needs to stay around for data logging or ordered
2905** write purposes
2906*/
2907static int invalidatepage_can_drop(struct inode *inode, struct buffer_head *bh)
2908{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002909 int ret = 1;
2910 struct reiserfs_journal *j = SB_JOURNAL(inode->i_sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002911
Chris Masond62b1b82006-02-01 03:06:47 -08002912 lock_buffer(bh);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002913 spin_lock(&j->j_dirty_buffers_lock);
2914 if (!buffer_mapped(bh)) {
2915 goto free_jh;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002916 }
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002917 /* the page is locked, and the only places that log a data buffer
2918 * also lock the page.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002919 */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002920 if (reiserfs_file_data_log(inode)) {
2921 /*
2922 * very conservative, leave the buffer pinned if
2923 * anyone might need it.
2924 */
2925 if (buffer_journaled(bh) || buffer_journal_dirty(bh)) {
2926 ret = 0;
2927 }
Chris Masond62b1b82006-02-01 03:06:47 -08002928 } else if (buffer_dirty(bh)) {
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002929 struct reiserfs_journal_list *jl;
2930 struct reiserfs_jh *jh = bh->b_private;
2931
2932 /* why is this safe?
2933 * reiserfs_setattr updates i_size in the on disk
2934 * stat data before allowing vmtruncate to be called.
2935 *
2936 * If buffer was put onto the ordered list for this
2937 * transaction, we know for sure either this transaction
2938 * or an older one already has updated i_size on disk,
2939 * and this ordered data won't be referenced in the file
2940 * if we crash.
2941 *
2942 * if the buffer was put onto the ordered list for an older
2943 * transaction, we need to leave it around
2944 */
2945 if (jh && (jl = jh->jl)
2946 && jl != SB_JOURNAL(inode->i_sb)->j_current_jl)
2947 ret = 0;
2948 }
2949 free_jh:
2950 if (ret && bh->b_private) {
2951 reiserfs_free_jh(bh);
2952 }
2953 spin_unlock(&j->j_dirty_buffers_lock);
Chris Masond62b1b82006-02-01 03:06:47 -08002954 unlock_buffer(bh);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002955 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002956}
2957
2958/* clm -- taken from fs/buffer.c:block_invalidate_page */
NeilBrown2ff28e22006-03-26 01:37:18 -08002959static void reiserfs_invalidatepage(struct page *page, unsigned long offset)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002960{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002961 struct buffer_head *head, *bh, *next;
2962 struct inode *inode = page->mapping->host;
2963 unsigned int curr_off = 0;
2964 int ret = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002965
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002966 BUG_ON(!PageLocked(page));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002967
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002968 if (offset == 0)
2969 ClearPageChecked(page);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002970
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002971 if (!page_has_buffers(page))
2972 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002973
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002974 head = page_buffers(page);
2975 bh = head;
2976 do {
2977 unsigned int next_off = curr_off + bh->b_size;
2978 next = bh->b_this_page;
2979
2980 /*
2981 * is this block fully invalidated?
2982 */
2983 if (offset <= curr_off) {
2984 if (invalidatepage_can_drop(inode, bh))
2985 reiserfs_unmap_buffer(bh);
2986 else
2987 ret = 0;
2988 }
2989 curr_off = next_off;
2990 bh = next;
2991 } while (bh != head);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002992
2993 /*
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002994 * We release buffers only if the entire page is being invalidated.
2995 * The get_block cached value has been unconditionally invalidated,
2996 * so real IO is not possible anymore.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002997 */
NeilBrown2ff28e22006-03-26 01:37:18 -08002998 if (!offset && ret) {
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07002999 ret = try_to_release_page(page, 0);
NeilBrown2ff28e22006-03-26 01:37:18 -08003000 /* maybe should BUG_ON(!ret); - neilb */
3001 }
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003002 out:
NeilBrown2ff28e22006-03-26 01:37:18 -08003003 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003004}
3005
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003006static int reiserfs_set_page_dirty(struct page *page)
3007{
3008 struct inode *inode = page->mapping->host;
3009 if (reiserfs_file_data_log(inode)) {
3010 SetPageChecked(page);
3011 return __set_page_dirty_nobuffers(page);
3012 }
3013 return __set_page_dirty_buffers(page);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003014}
3015
3016/*
3017 * Returns 1 if the page's buffers were dropped. The page is locked.
3018 *
3019 * Takes j_dirty_buffers_lock to protect the b_assoc_buffers list_heads
3020 * in the buffers at page_buffers(page).
3021 *
3022 * even in -o notail mode, we can't be sure an old mount without -o notail
3023 * didn't create files with tails.
3024 */
Al Viro27496a82005-10-21 03:20:48 -04003025static int reiserfs_releasepage(struct page *page, gfp_t unused_gfp_flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003026{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003027 struct inode *inode = page->mapping->host;
3028 struct reiserfs_journal *j = SB_JOURNAL(inode->i_sb);
3029 struct buffer_head *head;
3030 struct buffer_head *bh;
3031 int ret = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003032
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003033 WARN_ON(PageChecked(page));
3034 spin_lock(&j->j_dirty_buffers_lock);
3035 head = page_buffers(page);
3036 bh = head;
3037 do {
3038 if (bh->b_private) {
3039 if (!buffer_dirty(bh) && !buffer_locked(bh)) {
3040 reiserfs_free_jh(bh);
3041 } else {
3042 ret = 0;
3043 break;
3044 }
3045 }
3046 bh = bh->b_this_page;
3047 } while (bh != head);
3048 if (ret)
3049 ret = try_to_free_buffers(page);
3050 spin_unlock(&j->j_dirty_buffers_lock);
3051 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003052}
3053
3054/* We thank Mingming Cao for helping us understand in great detail what
3055 to do in this section of the code. */
3056static ssize_t reiserfs_direct_IO(int rw, struct kiocb *iocb,
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003057 const struct iovec *iov, loff_t offset,
3058 unsigned long nr_segs)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003059{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003060 struct file *file = iocb->ki_filp;
3061 struct inode *inode = file->f_mapping->host;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003062
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003063 return blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov,
3064 offset, nr_segs,
3065 reiserfs_get_blocks_direct_io, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003066}
3067
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003068int reiserfs_setattr(struct dentry *dentry, struct iattr *attr)
3069{
3070 struct inode *inode = dentry->d_inode;
Jeff Laytoncdd6fe62007-10-18 03:05:19 -07003071 unsigned int ia_valid;
Frederic Weisbecker5fe1533f2010-01-04 22:04:01 +01003072 int depth;
3073 int error;
Jeff Laytoncdd6fe62007-10-18 03:05:19 -07003074
3075 /* must be turned off for recursive notify_change calls */
3076 ia_valid = attr->ia_valid &= ~(ATTR_KILL_SUID|ATTR_KILL_SGID);
3077
Frederic Weisbecker5fe1533f2010-01-04 22:04:01 +01003078 depth = reiserfs_write_lock_once(inode->i_sb);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003079 if (attr->ia_valid & ATTR_SIZE) {
Christoph Hellwig871a2932010-03-03 09:05:07 -05003080 dquot_initialize(inode);
Christoph Hellwig907f4552010-03-03 09:05:06 -05003081
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003082 /* version 2 items will be caught by the s_maxbytes check
3083 ** done for us in vmtruncate
3084 */
3085 if (get_inode_item_key_version(inode) == KEY_FORMAT_3_5 &&
3086 attr->ia_size > MAX_NON_LFS) {
3087 error = -EFBIG;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003088 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003089 }
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003090 /* fill in hole pointers in the expanding truncate case. */
3091 if (attr->ia_size > inode->i_size) {
Vladimir Savelievf7557e82007-10-16 01:25:14 -07003092 error = generic_cont_expand_simple(inode, attr->ia_size);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003093 if (REISERFS_I(inode)->i_prealloc_count > 0) {
3094 int err;
3095 struct reiserfs_transaction_handle th;
3096 /* we're changing at most 2 bitmaps, inode + super */
3097 err = journal_begin(&th, inode->i_sb, 4);
3098 if (!err) {
3099 reiserfs_discard_prealloc(&th, inode);
3100 err = journal_end(&th, inode->i_sb, 4);
3101 }
3102 if (err)
3103 error = err;
3104 }
3105 if (error)
3106 goto out;
Vladimir Savelievdd535a52006-07-01 04:36:32 -07003107 /*
3108 * file size is changed, ctime and mtime are
3109 * to be updated
3110 */
3111 attr->ia_valid |= (ATTR_MTIME | ATTR_CTIME);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003112 }
3113 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003114
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003115 if ((((attr->ia_valid & ATTR_UID) && (attr->ia_uid & ~0xffff)) ||
3116 ((attr->ia_valid & ATTR_GID) && (attr->ia_gid & ~0xffff))) &&
3117 (get_inode_sd_version(inode) == STAT_DATA_V1)) {
3118 /* stat data of format v3.5 has 16 bit uid and gid */
3119 error = -EINVAL;
3120 goto out;
3121 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003122
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003123 error = inode_change_ok(inode, attr);
3124 if (!error) {
3125 if ((ia_valid & ATTR_UID && attr->ia_uid != inode->i_uid) ||
3126 (ia_valid & ATTR_GID && attr->ia_gid != inode->i_gid)) {
3127 error = reiserfs_chown_xattrs(inode, attr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003128
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003129 if (!error) {
3130 struct reiserfs_transaction_handle th;
3131 int jbegin_count =
3132 2 *
3133 (REISERFS_QUOTA_INIT_BLOCKS(inode->i_sb) +
3134 REISERFS_QUOTA_DEL_BLOCKS(inode->i_sb)) +
3135 2;
3136
3137 /* (user+group)*(old+new) structure - we count quota info and , inode write (sb, inode) */
3138 error =
3139 journal_begin(&th, inode->i_sb,
3140 jbegin_count);
3141 if (error)
3142 goto out;
Christoph Hellwigb43fa822010-03-03 09:05:03 -05003143 error = dquot_transfer(inode, attr);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003144 if (error) {
3145 journal_end(&th, inode->i_sb,
3146 jbegin_count);
3147 goto out;
3148 }
3149 /* Update corresponding info in inode so that everything is in
3150 * one transaction */
3151 if (attr->ia_valid & ATTR_UID)
3152 inode->i_uid = attr->ia_uid;
3153 if (attr->ia_valid & ATTR_GID)
3154 inode->i_gid = attr->ia_gid;
3155 mark_inode_dirty(inode);
3156 error =
3157 journal_end(&th, inode->i_sb, jbegin_count);
3158 }
3159 }
Frederic Weisbecker108d3942010-01-05 00:15:38 +01003160 if (!error) {
3161 /*
3162 * Relax the lock here, as it might truncate the
3163 * inode pages and wait for inode pages locks.
3164 * To release such page lock, the owner needs the
3165 * reiserfs lock
3166 */
3167 reiserfs_write_unlock_once(inode->i_sb, depth);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003168 error = inode_setattr(inode, attr);
Frederic Weisbecker108d3942010-01-05 00:15:38 +01003169 depth = reiserfs_write_lock_once(inode->i_sb);
3170 }
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003171 }
3172
3173 if (!error && reiserfs_posixacl(inode->i_sb)) {
3174 if (attr->ia_valid & ATTR_MODE)
3175 error = reiserfs_acl_chmod(inode);
3176 }
3177
3178 out:
Frederic Weisbecker5fe1533f2010-01-04 22:04:01 +01003179 reiserfs_write_unlock_once(inode->i_sb, depth);
3180
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003181 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003182}
3183
Christoph Hellwigf5e54d62006-06-28 04:26:44 -07003184const struct address_space_operations reiserfs_address_space_operations = {
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003185 .writepage = reiserfs_writepage,
3186 .readpage = reiserfs_readpage,
3187 .readpages = reiserfs_readpages,
3188 .releasepage = reiserfs_releasepage,
3189 .invalidatepage = reiserfs_invalidatepage,
3190 .sync_page = block_sync_page,
Vladimir Savelievba9d8ce2007-10-16 01:25:14 -07003191 .write_begin = reiserfs_write_begin,
3192 .write_end = reiserfs_write_end,
Linus Torvaldsbd4c6252005-07-12 20:21:28 -07003193 .bmap = reiserfs_aop_bmap,
3194 .direct_IO = reiserfs_direct_IO,
3195 .set_page_dirty = reiserfs_set_page_dirty,
3196};