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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/string.h>
6#include <linux/errno.h>
7#include <linux/fs.h>
8#include <linux/reiserfs_fs.h>
9#include <linux/stat.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070010#include <linux/buffer_head.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090011#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070012#include <asm/uaccess.h>
13
David Woodhouse5a1b6392007-05-23 13:57:52 -070014extern const struct reiserfs_key MIN_KEY;
Linus Torvalds1da177e2005-04-16 15:20:36 -070015
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070016static int reiserfs_readdir(struct file *, void *, filldir_t);
Josef Bacik02c24a82011-07-16 20:44:56 -040017static int reiserfs_dir_fsync(struct file *filp, loff_t start, loff_t end,
18 int datasync);
Linus Torvalds1da177e2005-04-16 15:20:36 -070019
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -080020const struct file_operations reiserfs_dir_operations = {
jan Blunckca572722010-05-26 14:44:53 -070021 .llseek = generic_file_llseek,
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070022 .read = generic_read_dir,
23 .readdir = reiserfs_readdir,
24 .fsync = reiserfs_dir_fsync,
Frederic Weisbecker205cb372009-10-14 23:22:17 +020025 .unlocked_ioctl = reiserfs_ioctl,
David Howells52b499c2006-08-29 19:06:18 +010026#ifdef CONFIG_COMPAT
27 .compat_ioctl = reiserfs_compat_ioctl,
28#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -070029};
30
Josef Bacik02c24a82011-07-16 20:44:56 -040031static int reiserfs_dir_fsync(struct file *filp, loff_t start, loff_t end,
32 int datasync)
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070033{
Christoph Hellwig7ea80852010-05-26 17:53:25 +020034 struct inode *inode = filp->f_mapping->host;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070035 int err;
Josef Bacik02c24a82011-07-16 20:44:56 -040036
37 err = filemap_write_and_wait_range(inode->i_mapping, start, end);
38 if (err)
39 return err;
40
41 mutex_lock(&inode->i_mutex);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070042 reiserfs_write_lock(inode->i_sb);
43 err = reiserfs_commit_for_inode(inode);
44 reiserfs_write_unlock(inode->i_sb);
Josef Bacik02c24a82011-07-16 20:44:56 -040045 mutex_unlock(&inode->i_mutex);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070046 if (err < 0)
47 return err;
48 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -070049}
50
Linus Torvalds1da177e2005-04-16 15:20:36 -070051#define store_ih(where,what) copy_item_head (where, what)
52
Jeff Mahoney677c9b22009-05-05 15:30:17 -040053static inline bool is_privroot_deh(struct dentry *dir,
54 struct reiserfs_de_head *deh)
55{
Jeff Mahoney677c9b22009-05-05 15:30:17 -040056 struct dentry *privroot = REISERFS_SB(dir->d_sb)->priv_root;
Jeff Mahoney73422812009-05-10 16:05:39 -040057 return (dir == dir->d_parent && privroot->d_inode &&
58 deh->deh_objectid == INODE_PKEY(privroot->d_inode)->k_objectid);
Jeff Mahoney677c9b22009-05-05 15:30:17 -040059}
60
Jeff Mahoneya41f1a42009-03-30 14:02:40 -040061int reiserfs_readdir_dentry(struct dentry *dentry, void *dirent,
62 filldir_t filldir, loff_t *pos)
Linus Torvalds1da177e2005-04-16 15:20:36 -070063{
Jeff Mahoneya41f1a42009-03-30 14:02:40 -040064 struct inode *inode = dentry->d_inode;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070065 struct cpu_key pos_key; /* key of current position in the directory (key of directory entry) */
66 INITIALIZE_PATH(path_to_entry);
67 struct buffer_head *bh;
68 int item_num, entry_num;
69 const struct reiserfs_key *rkey;
70 struct item_head *ih, tmp_ih;
71 int search_res;
72 char *local_buf;
73 loff_t next_pos;
74 char small_buf[32]; /* avoid kmalloc if we can */
75 struct reiserfs_dir_entry de;
76 int ret = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -070077
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070078 reiserfs_write_lock(inode->i_sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -070079
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070080 reiserfs_check_lock_depth(inode->i_sb, "readdir");
Linus Torvalds1da177e2005-04-16 15:20:36 -070081
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070082 /* form key for search the next directory entry using f_pos field of
83 file structure */
Jeff Mahoneya41f1a42009-03-30 14:02:40 -040084 make_cpu_key(&pos_key, inode, *pos ?: DOT_OFFSET, TYPE_DIRENTRY, 3);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070085 next_pos = cpu_key_k_offset(&pos_key);
Linus Torvalds1da177e2005-04-16 15:20:36 -070086
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070087 path_to_entry.reada = PATH_READA;
88 while (1) {
89 research:
90 /* search the directory item, containing entry with specified key */
91 search_res =
92 search_by_entry_key(inode->i_sb, &pos_key, &path_to_entry,
93 &de);
94 if (search_res == IO_ERROR) {
95 // FIXME: we could just skip part of directory which could
96 // not be read
97 ret = -EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -070098 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -070099 }
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700100 entry_num = de.de_entry_num;
101 bh = de.de_bh;
102 item_num = de.de_item_num;
103 ih = de.de_ih;
104 store_ih(&tmp_ih, ih);
105
106 /* we must have found item, that is item of this directory, */
107 RFALSE(COMP_SHORT_KEYS(&(ih->ih_key), &pos_key),
108 "vs-9000: found item %h does not match to dir we readdir %K",
109 ih, &pos_key);
110 RFALSE(item_num > B_NR_ITEMS(bh) - 1,
111 "vs-9005 item_num == %d, item amount == %d",
112 item_num, B_NR_ITEMS(bh));
113
114 /* and entry must be not more than number of entries in the item */
115 RFALSE(I_ENTRY_COUNT(ih) < entry_num,
116 "vs-9010: entry number is too big %d (%d)",
117 entry_num, I_ENTRY_COUNT(ih));
118
119 if (search_res == POSITION_FOUND
120 || entry_num < I_ENTRY_COUNT(ih)) {
121 /* go through all entries in the directory item beginning from the entry, that has been found */
122 struct reiserfs_de_head *deh =
123 B_I_DEH(bh, ih) + entry_num;
124
125 for (; entry_num < I_ENTRY_COUNT(ih);
126 entry_num++, deh++) {
127 int d_reclen;
128 char *d_name;
129 off_t d_off;
130 ino_t d_ino;
131
132 if (!de_visible(deh))
133 /* it is hidden entry */
134 continue;
135 d_reclen = entry_length(bh, ih, entry_num);
136 d_name = B_I_DEH_ENTRY_FILE_NAME(bh, ih, deh);
Lepton Wu80eb68d2007-10-16 23:29:50 -0700137
138 if (d_reclen <= 0 ||
139 d_name + d_reclen > bh->b_data + bh->b_size) {
140 /* There is corrupted data in entry,
141 * We'd better stop here */
142 pathrelse(&path_to_entry);
143 ret = -EIO;
144 goto out;
145 }
146
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700147 if (!d_name[d_reclen - 1])
148 d_reclen = strlen(d_name);
149
150 if (d_reclen >
151 REISERFS_MAX_NAME(inode->i_sb->
152 s_blocksize)) {
153 /* too big to send back to VFS */
154 continue;
155 }
156
157 /* Ignore the .reiserfs_priv entry */
Jeff Mahoney677c9b22009-05-05 15:30:17 -0400158 if (is_privroot_deh(dentry, deh))
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700159 continue;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700160
161 d_off = deh_offset(deh);
Jeff Mahoneya41f1a42009-03-30 14:02:40 -0400162 *pos = d_off;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700163 d_ino = deh_objectid(deh);
164 if (d_reclen <= 32) {
165 local_buf = small_buf;
166 } else {
Pekka Enbergd739b422006-02-01 03:06:43 -0800167 local_buf = kmalloc(d_reclen,
168 GFP_NOFS);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700169 if (!local_buf) {
170 pathrelse(&path_to_entry);
171 ret = -ENOMEM;
172 goto out;
173 }
174 if (item_moved(&tmp_ih, &path_to_entry)) {
Pekka Enbergd739b422006-02-01 03:06:43 -0800175 kfree(local_buf);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700176 goto research;
177 }
178 }
179 // Note, that we copy name to user space via temporary
180 // buffer (local_buf) because filldir will block if
181 // user space buffer is swapped out. At that time
182 // entry can move to somewhere else
183 memcpy(local_buf, d_name, d_reclen);
Frederic Weisbecker8ebc4232009-04-07 04:19:49 +0200184
185 /*
186 * Since filldir might sleep, we can release
187 * the write lock here for other waiters
188 */
189 reiserfs_write_unlock(inode->i_sb);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700190 if (filldir
191 (dirent, local_buf, d_reclen, d_off, d_ino,
192 DT_UNKNOWN) < 0) {
Frederic Weisbecker8ebc4232009-04-07 04:19:49 +0200193 reiserfs_write_lock(inode->i_sb);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700194 if (local_buf != small_buf) {
Pekka Enbergd739b422006-02-01 03:06:43 -0800195 kfree(local_buf);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700196 }
197 goto end;
198 }
Frederic Weisbecker8ebc4232009-04-07 04:19:49 +0200199 reiserfs_write_lock(inode->i_sb);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700200 if (local_buf != small_buf) {
Pekka Enbergd739b422006-02-01 03:06:43 -0800201 kfree(local_buf);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700202 }
203 // next entry should be looked for with such offset
204 next_pos = deh_offset(deh) + 1;
205
206 if (item_moved(&tmp_ih, &path_to_entry)) {
207 goto research;
208 }
209 } /* for */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700210 }
211
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700212 if (item_num != B_NR_ITEMS(bh) - 1)
213 // end of directory has been reached
214 goto end;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700215
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700216 /* item we went through is last item of node. Using right
217 delimiting key check is it directory end */
218 rkey = get_rkey(&path_to_entry, inode->i_sb);
219 if (!comp_le_keys(rkey, &MIN_KEY)) {
220 /* set pos_key to key, that is the smallest and greater
221 that key of the last entry in the item */
222 set_cpu_key_k_offset(&pos_key, next_pos);
223 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700224 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700225
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700226 if (COMP_SHORT_KEYS(rkey, &pos_key)) {
227 // end of directory has been reached
228 goto end;
229 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700231 /* directory continues in the right neighboring block */
232 set_cpu_key_k_offset(&pos_key,
233 le_key_k_offset(KEY_FORMAT_3_5, rkey));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700234
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700235 } /* while */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700236
Jeff Mahoneya41f1a42009-03-30 14:02:40 -0400237end:
238 *pos = next_pos;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700239 pathrelse(&path_to_entry);
240 reiserfs_check_path(&path_to_entry);
Jeff Mahoneya41f1a42009-03-30 14:02:40 -0400241out:
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700242 reiserfs_write_unlock(inode->i_sb);
243 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700244}
245
Jeff Mahoneya41f1a42009-03-30 14:02:40 -0400246static int reiserfs_readdir(struct file *file, void *dirent, filldir_t filldir)
247{
248 struct dentry *dentry = file->f_path.dentry;
249 return reiserfs_readdir_dentry(dentry, dirent, filldir, &file->f_pos);
250}
251
Linus Torvalds1da177e2005-04-16 15:20:36 -0700252/* compose directory item containing "." and ".." entries (entries are
253 not aligned to 4 byte boundary) */
254/* the last four params are LE */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700255void make_empty_dir_item_v1(char *body, __le32 dirid, __le32 objid,
256 __le32 par_dirid, __le32 par_objid)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700258 struct reiserfs_de_head *deh;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700259
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700260 memset(body, 0, EMPTY_DIR_SIZE_V1);
261 deh = (struct reiserfs_de_head *)body;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700262
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700263 /* direntry header of "." */
264 put_deh_offset(&(deh[0]), DOT_OFFSET);
265 /* these two are from make_le_item_head, and are are LE */
266 deh[0].deh_dir_id = dirid;
267 deh[0].deh_objectid = objid;
268 deh[0].deh_state = 0; /* Endian safe if 0 */
269 put_deh_location(&(deh[0]), EMPTY_DIR_SIZE_V1 - strlen("."));
270 mark_de_visible(&(deh[0]));
271
272 /* direntry header of ".." */
273 put_deh_offset(&(deh[1]), DOT_DOT_OFFSET);
274 /* key of ".." for the root directory */
275 /* these two are from the inode, and are are LE */
276 deh[1].deh_dir_id = par_dirid;
277 deh[1].deh_objectid = par_objid;
278 deh[1].deh_state = 0; /* Endian safe if 0 */
279 put_deh_location(&(deh[1]), deh_location(&(deh[0])) - strlen(".."));
280 mark_de_visible(&(deh[1]));
281
282 /* copy ".." and "." */
283 memcpy(body + deh_location(&(deh[0])), ".", 1);
284 memcpy(body + deh_location(&(deh[1])), "..", 2);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700285}
286
287/* compose directory item containing "." and ".." entries */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700288void make_empty_dir_item(char *body, __le32 dirid, __le32 objid,
289 __le32 par_dirid, __le32 par_objid)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700290{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700291 struct reiserfs_de_head *deh;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700292
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700293 memset(body, 0, EMPTY_DIR_SIZE);
294 deh = (struct reiserfs_de_head *)body;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700295
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700296 /* direntry header of "." */
297 put_deh_offset(&(deh[0]), DOT_OFFSET);
298 /* these two are from make_le_item_head, and are are LE */
299 deh[0].deh_dir_id = dirid;
300 deh[0].deh_objectid = objid;
301 deh[0].deh_state = 0; /* Endian safe if 0 */
302 put_deh_location(&(deh[0]), EMPTY_DIR_SIZE - ROUND_UP(strlen(".")));
303 mark_de_visible(&(deh[0]));
304
305 /* direntry header of ".." */
306 put_deh_offset(&(deh[1]), DOT_DOT_OFFSET);
307 /* key of ".." for the root directory */
308 /* these two are from the inode, and are are LE */
309 deh[1].deh_dir_id = par_dirid;
310 deh[1].deh_objectid = par_objid;
311 deh[1].deh_state = 0; /* Endian safe if 0 */
312 put_deh_location(&(deh[1]),
313 deh_location(&(deh[0])) - ROUND_UP(strlen("..")));
314 mark_de_visible(&(deh[1]));
315
316 /* copy ".." and "." */
317 memcpy(body + deh_location(&(deh[0])), ".", 1);
318 memcpy(body + deh_location(&(deh[1])), "..", 2);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700319}