blob: ffbfc2caaf2050990de21e5a4348a789fbd65c99 [file] [log] [blame]
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>
11#include <asm/uaccess.h>
12
David Woodhouse5a1b6392007-05-23 13:57:52 -070013extern const struct reiserfs_key MIN_KEY;
Linus Torvalds1da177e2005-04-16 15:20:36 -070014
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070015static int reiserfs_readdir(struct file *, void *, filldir_t);
16static int reiserfs_dir_fsync(struct file *filp, struct dentry *dentry,
17 int datasync);
Linus Torvalds1da177e2005-04-16 15:20:36 -070018
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -080019const struct file_operations reiserfs_dir_operations = {
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070020 .read = generic_read_dir,
21 .readdir = reiserfs_readdir,
22 .fsync = reiserfs_dir_fsync,
23 .ioctl = reiserfs_ioctl,
David Howells52b499c2006-08-29 19:06:18 +010024#ifdef CONFIG_COMPAT
25 .compat_ioctl = reiserfs_compat_ioctl,
26#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -070027};
28
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070029static int reiserfs_dir_fsync(struct file *filp, struct dentry *dentry,
30 int datasync)
31{
32 struct inode *inode = dentry->d_inode;
33 int err;
34 reiserfs_write_lock(inode->i_sb);
35 err = reiserfs_commit_for_inode(inode);
36 reiserfs_write_unlock(inode->i_sb);
37 if (err < 0)
38 return err;
39 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -070040}
41
Linus Torvalds1da177e2005-04-16 15:20:36 -070042#define store_ih(where,what) copy_item_head (where, what)
43
44//
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070045static int reiserfs_readdir(struct file *filp, void *dirent, filldir_t filldir)
Linus Torvalds1da177e2005-04-16 15:20:36 -070046{
Josef Sipek1fc5adb2006-12-08 02:37:33 -080047 struct inode *inode = filp->f_path.dentry->d_inode;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070048 struct cpu_key pos_key; /* key of current position in the directory (key of directory entry) */
49 INITIALIZE_PATH(path_to_entry);
50 struct buffer_head *bh;
51 int item_num, entry_num;
52 const struct reiserfs_key *rkey;
53 struct item_head *ih, tmp_ih;
54 int search_res;
55 char *local_buf;
56 loff_t next_pos;
57 char small_buf[32]; /* avoid kmalloc if we can */
58 struct reiserfs_dir_entry de;
59 int ret = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -070060
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070061 reiserfs_write_lock(inode->i_sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -070062
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070063 reiserfs_check_lock_depth(inode->i_sb, "readdir");
Linus Torvalds1da177e2005-04-16 15:20:36 -070064
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070065 /* form key for search the next directory entry using f_pos field of
66 file structure */
67 make_cpu_key(&pos_key, inode,
68 (filp->f_pos) ? (filp->f_pos) : DOT_OFFSET, TYPE_DIRENTRY,
69 3);
70 next_pos = cpu_key_k_offset(&pos_key);
Linus Torvalds1da177e2005-04-16 15:20:36 -070071
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070072 /* reiserfs_warning (inode->i_sb, "reiserfs_readdir 1: f_pos = %Ld", filp->f_pos); */
Linus Torvalds1da177e2005-04-16 15:20:36 -070073
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070074 path_to_entry.reada = PATH_READA;
75 while (1) {
76 research:
77 /* search the directory item, containing entry with specified key */
78 search_res =
79 search_by_entry_key(inode->i_sb, &pos_key, &path_to_entry,
80 &de);
81 if (search_res == IO_ERROR) {
82 // FIXME: we could just skip part of directory which could
83 // not be read
84 ret = -EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -070085 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -070086 }
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070087 entry_num = de.de_entry_num;
88 bh = de.de_bh;
89 item_num = de.de_item_num;
90 ih = de.de_ih;
91 store_ih(&tmp_ih, ih);
92
93 /* we must have found item, that is item of this directory, */
94 RFALSE(COMP_SHORT_KEYS(&(ih->ih_key), &pos_key),
95 "vs-9000: found item %h does not match to dir we readdir %K",
96 ih, &pos_key);
97 RFALSE(item_num > B_NR_ITEMS(bh) - 1,
98 "vs-9005 item_num == %d, item amount == %d",
99 item_num, B_NR_ITEMS(bh));
100
101 /* and entry must be not more than number of entries in the item */
102 RFALSE(I_ENTRY_COUNT(ih) < entry_num,
103 "vs-9010: entry number is too big %d (%d)",
104 entry_num, I_ENTRY_COUNT(ih));
105
106 if (search_res == POSITION_FOUND
107 || entry_num < I_ENTRY_COUNT(ih)) {
108 /* go through all entries in the directory item beginning from the entry, that has been found */
109 struct reiserfs_de_head *deh =
110 B_I_DEH(bh, ih) + entry_num;
111
112 for (; entry_num < I_ENTRY_COUNT(ih);
113 entry_num++, deh++) {
114 int d_reclen;
115 char *d_name;
116 off_t d_off;
117 ino_t d_ino;
118
119 if (!de_visible(deh))
120 /* it is hidden entry */
121 continue;
122 d_reclen = entry_length(bh, ih, entry_num);
123 d_name = B_I_DEH_ENTRY_FILE_NAME(bh, ih, deh);
124 if (!d_name[d_reclen - 1])
125 d_reclen = strlen(d_name);
126
127 if (d_reclen >
128 REISERFS_MAX_NAME(inode->i_sb->
129 s_blocksize)) {
130 /* too big to send back to VFS */
131 continue;
132 }
133
134 /* Ignore the .reiserfs_priv entry */
135 if (reiserfs_xattrs(inode->i_sb) &&
136 !old_format_only(inode->i_sb) &&
Josef Sipek1fc5adb2006-12-08 02:37:33 -0800137 filp->f_path.dentry == inode->i_sb->s_root &&
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700138 REISERFS_SB(inode->i_sb)->priv_root &&
139 REISERFS_SB(inode->i_sb)->priv_root->d_inode
140 && deh_objectid(deh) ==
141 le32_to_cpu(INODE_PKEY
142 (REISERFS_SB(inode->i_sb)->
143 priv_root->d_inode)->
144 k_objectid)) {
145 continue;
146 }
147
148 d_off = deh_offset(deh);
149 filp->f_pos = d_off;
150 d_ino = deh_objectid(deh);
151 if (d_reclen <= 32) {
152 local_buf = small_buf;
153 } else {
Pekka Enbergd739b422006-02-01 03:06:43 -0800154 local_buf = kmalloc(d_reclen,
155 GFP_NOFS);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700156 if (!local_buf) {
157 pathrelse(&path_to_entry);
158 ret = -ENOMEM;
159 goto out;
160 }
161 if (item_moved(&tmp_ih, &path_to_entry)) {
Pekka Enbergd739b422006-02-01 03:06:43 -0800162 kfree(local_buf);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700163 goto research;
164 }
165 }
166 // Note, that we copy name to user space via temporary
167 // buffer (local_buf) because filldir will block if
168 // user space buffer is swapped out. At that time
169 // entry can move to somewhere else
170 memcpy(local_buf, d_name, d_reclen);
171 if (filldir
172 (dirent, local_buf, d_reclen, d_off, d_ino,
173 DT_UNKNOWN) < 0) {
174 if (local_buf != small_buf) {
Pekka Enbergd739b422006-02-01 03:06:43 -0800175 kfree(local_buf);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700176 }
177 goto end;
178 }
179 if (local_buf != small_buf) {
Pekka Enbergd739b422006-02-01 03:06:43 -0800180 kfree(local_buf);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700181 }
182 // next entry should be looked for with such offset
183 next_pos = deh_offset(deh) + 1;
184
185 if (item_moved(&tmp_ih, &path_to_entry)) {
186 goto research;
187 }
188 } /* for */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700189 }
190
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700191 if (item_num != B_NR_ITEMS(bh) - 1)
192 // end of directory has been reached
193 goto end;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700195 /* item we went through is last item of node. Using right
196 delimiting key check is it directory end */
197 rkey = get_rkey(&path_to_entry, inode->i_sb);
198 if (!comp_le_keys(rkey, &MIN_KEY)) {
199 /* set pos_key to key, that is the smallest and greater
200 that key of the last entry in the item */
201 set_cpu_key_k_offset(&pos_key, next_pos);
202 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700203 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700204
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700205 if (COMP_SHORT_KEYS(rkey, &pos_key)) {
206 // end of directory has been reached
207 goto end;
208 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700209
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700210 /* directory continues in the right neighboring block */
211 set_cpu_key_k_offset(&pos_key,
212 le_key_k_offset(KEY_FORMAT_3_5, rkey));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700213
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700214 } /* while */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700215
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700216 end:
217 filp->f_pos = next_pos;
218 pathrelse(&path_to_entry);
219 reiserfs_check_path(&path_to_entry);
220 out:
221 reiserfs_write_unlock(inode->i_sb);
222 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700223}
224
225/* compose directory item containing "." and ".." entries (entries are
226 not aligned to 4 byte boundary) */
227/* the last four params are LE */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700228void make_empty_dir_item_v1(char *body, __le32 dirid, __le32 objid,
229 __le32 par_dirid, __le32 par_objid)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700231 struct reiserfs_de_head *deh;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700232
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700233 memset(body, 0, EMPTY_DIR_SIZE_V1);
234 deh = (struct reiserfs_de_head *)body;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700235
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700236 /* direntry header of "." */
237 put_deh_offset(&(deh[0]), DOT_OFFSET);
238 /* these two are from make_le_item_head, and are are LE */
239 deh[0].deh_dir_id = dirid;
240 deh[0].deh_objectid = objid;
241 deh[0].deh_state = 0; /* Endian safe if 0 */
242 put_deh_location(&(deh[0]), EMPTY_DIR_SIZE_V1 - strlen("."));
243 mark_de_visible(&(deh[0]));
244
245 /* direntry header of ".." */
246 put_deh_offset(&(deh[1]), DOT_DOT_OFFSET);
247 /* key of ".." for the root directory */
248 /* these two are from the inode, and are are LE */
249 deh[1].deh_dir_id = par_dirid;
250 deh[1].deh_objectid = par_objid;
251 deh[1].deh_state = 0; /* Endian safe if 0 */
252 put_deh_location(&(deh[1]), deh_location(&(deh[0])) - strlen(".."));
253 mark_de_visible(&(deh[1]));
254
255 /* copy ".." and "." */
256 memcpy(body + deh_location(&(deh[0])), ".", 1);
257 memcpy(body + deh_location(&(deh[1])), "..", 2);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700258}
259
260/* compose directory item containing "." and ".." entries */
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700261void make_empty_dir_item(char *body, __le32 dirid, __le32 objid,
262 __le32 par_dirid, __le32 par_objid)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700263{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700264 struct reiserfs_de_head *deh;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700265
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700266 memset(body, 0, EMPTY_DIR_SIZE);
267 deh = (struct reiserfs_de_head *)body;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700268
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700269 /* direntry header of "." */
270 put_deh_offset(&(deh[0]), DOT_OFFSET);
271 /* these two are from make_le_item_head, and are are LE */
272 deh[0].deh_dir_id = dirid;
273 deh[0].deh_objectid = objid;
274 deh[0].deh_state = 0; /* Endian safe if 0 */
275 put_deh_location(&(deh[0]), EMPTY_DIR_SIZE - ROUND_UP(strlen(".")));
276 mark_de_visible(&(deh[0]));
277
278 /* direntry header of ".." */
279 put_deh_offset(&(deh[1]), DOT_DOT_OFFSET);
280 /* key of ".." for the root directory */
281 /* these two are from the inode, and are are LE */
282 deh[1].deh_dir_id = par_dirid;
283 deh[1].deh_objectid = par_objid;
284 deh[1].deh_state = 0; /* Endian safe if 0 */
285 put_deh_location(&(deh[1]),
286 deh_location(&(deh[0])) - ROUND_UP(strlen("..")));
287 mark_de_visible(&(deh[1]));
288
289 /* copy ".." and "." */
290 memcpy(body + deh_location(&(deh[0])), ".", 1);
291 memcpy(body + deh_location(&(deh[1])), "..", 2);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700292}