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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Copyright 2000 by Hans Reiser, licensing governed by reiserfs/README | |
3 | */ | |
4 | ||
1da177e4 LT |
5 | #include <linux/string.h> |
6 | #include <linux/errno.h> | |
7 | #include <linux/fs.h> | |
f466c6fd | 8 | #include "reiserfs.h" |
1da177e4 | 9 | #include <linux/stat.h> |
1da177e4 | 10 | #include <linux/buffer_head.h> |
5a0e3ad6 | 11 | #include <linux/slab.h> |
1da177e4 LT |
12 | #include <asm/uaccess.h> |
13 | ||
5a1b6391 | 14 | extern const struct reiserfs_key MIN_KEY; |
1da177e4 | 15 | |
4acf381e | 16 | static int reiserfs_readdir(struct file *, struct dir_context *); |
02c24a82 JB |
17 | static int reiserfs_dir_fsync(struct file *filp, loff_t start, loff_t end, |
18 | int datasync); | |
1da177e4 | 19 | |
4b6f5d20 | 20 | const struct file_operations reiserfs_dir_operations = { |
ca572727 | 21 | .llseek = generic_file_llseek, |
bd4c625c | 22 | .read = generic_read_dir, |
4acf381e | 23 | .iterate = reiserfs_readdir, |
bd4c625c | 24 | .fsync = reiserfs_dir_fsync, |
205cb37b | 25 | .unlocked_ioctl = reiserfs_ioctl, |
52b499c4 DH |
26 | #ifdef CONFIG_COMPAT |
27 | .compat_ioctl = reiserfs_compat_ioctl, | |
28 | #endif | |
1da177e4 LT |
29 | }; |
30 | ||
02c24a82 JB |
31 | static int reiserfs_dir_fsync(struct file *filp, loff_t start, loff_t end, |
32 | int datasync) | |
bd4c625c | 33 | { |
7ea80859 | 34 | struct inode *inode = filp->f_mapping->host; |
bd4c625c | 35 | int err; |
02c24a82 JB |
36 | |
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); | |
bd4c625c LT |
42 | reiserfs_write_lock(inode->i_sb); |
43 | err = reiserfs_commit_for_inode(inode); | |
44 | reiserfs_write_unlock(inode->i_sb); | |
02c24a82 | 45 | mutex_unlock(&inode->i_mutex); |
bd4c625c LT |
46 | if (err < 0) |
47 | return err; | |
48 | return 0; | |
1da177e4 LT |
49 | } |
50 | ||
1da177e4 LT |
51 | #define store_ih(where,what) copy_item_head (where, what) |
52 | ||
99ce4169 | 53 | static inline bool is_privroot_deh(struct inode *dir, struct reiserfs_de_head *deh) |
677c9b2e | 54 | { |
99ce4169 AV |
55 | struct dentry *privroot = REISERFS_SB(dir->i_sb)->priv_root; |
56 | return (privroot->d_inode && | |
73422811 | 57 | deh->deh_objectid == INODE_PKEY(privroot->d_inode)->k_objectid); |
677c9b2e JM |
58 | } |
59 | ||
cd62cdae | 60 | int reiserfs_readdir_inode(struct inode *inode, struct dir_context *ctx) |
1da177e4 | 61 | { |
bd4c625c LT |
62 | struct cpu_key pos_key; /* key of current position in the directory (key of directory entry) */ |
63 | INITIALIZE_PATH(path_to_entry); | |
64 | struct buffer_head *bh; | |
65 | int item_num, entry_num; | |
66 | const struct reiserfs_key *rkey; | |
67 | struct item_head *ih, tmp_ih; | |
68 | int search_res; | |
69 | char *local_buf; | |
70 | loff_t next_pos; | |
71 | char small_buf[32]; /* avoid kmalloc if we can */ | |
72 | struct reiserfs_dir_entry de; | |
73 | int ret = 0; | |
278f6679 | 74 | int depth; |
bd4c625c LT |
75 | |
76 | reiserfs_write_lock(inode->i_sb); | |
77 | ||
78 | reiserfs_check_lock_depth(inode->i_sb, "readdir"); | |
79 | ||
80 | /* form key for search the next directory entry using f_pos field of | |
81 | file structure */ | |
4acf381e | 82 | make_cpu_key(&pos_key, inode, ctx->pos ?: DOT_OFFSET, TYPE_DIRENTRY, 3); |
bd4c625c LT |
83 | next_pos = cpu_key_k_offset(&pos_key); |
84 | ||
bd4c625c LT |
85 | path_to_entry.reada = PATH_READA; |
86 | while (1) { | |
87 | research: | |
88 | /* search the directory item, containing entry with specified key */ | |
89 | search_res = | |
90 | search_by_entry_key(inode->i_sb, &pos_key, &path_to_entry, | |
91 | &de); | |
92 | if (search_res == IO_ERROR) { | |
93 | // FIXME: we could just skip part of directory which could | |
94 | // not be read | |
95 | ret = -EIO; | |
1da177e4 | 96 | goto out; |
1da177e4 | 97 | } |
bd4c625c LT |
98 | entry_num = de.de_entry_num; |
99 | bh = de.de_bh; | |
100 | item_num = de.de_item_num; | |
101 | ih = de.de_ih; | |
102 | store_ih(&tmp_ih, ih); | |
103 | ||
104 | /* we must have found item, that is item of this directory, */ | |
105 | RFALSE(COMP_SHORT_KEYS(&(ih->ih_key), &pos_key), | |
106 | "vs-9000: found item %h does not match to dir we readdir %K", | |
107 | ih, &pos_key); | |
108 | RFALSE(item_num > B_NR_ITEMS(bh) - 1, | |
109 | "vs-9005 item_num == %d, item amount == %d", | |
110 | item_num, B_NR_ITEMS(bh)); | |
111 | ||
112 | /* and entry must be not more than number of entries in the item */ | |
113 | RFALSE(I_ENTRY_COUNT(ih) < entry_num, | |
114 | "vs-9010: entry number is too big %d (%d)", | |
115 | entry_num, I_ENTRY_COUNT(ih)); | |
116 | ||
117 | if (search_res == POSITION_FOUND | |
118 | || entry_num < I_ENTRY_COUNT(ih)) { | |
119 | /* go through all entries in the directory item beginning from the entry, that has been found */ | |
120 | struct reiserfs_de_head *deh = | |
121 | B_I_DEH(bh, ih) + entry_num; | |
122 | ||
123 | for (; entry_num < I_ENTRY_COUNT(ih); | |
124 | entry_num++, deh++) { | |
125 | int d_reclen; | |
126 | char *d_name; | |
bd4c625c LT |
127 | ino_t d_ino; |
128 | ||
129 | if (!de_visible(deh)) | |
130 | /* it is hidden entry */ | |
131 | continue; | |
132 | d_reclen = entry_length(bh, ih, entry_num); | |
133 | d_name = B_I_DEH_ENTRY_FILE_NAME(bh, ih, deh); | |
80eb68d2 LW |
134 | |
135 | if (d_reclen <= 0 || | |
136 | d_name + d_reclen > bh->b_data + bh->b_size) { | |
137 | /* There is corrupted data in entry, | |
138 | * We'd better stop here */ | |
139 | pathrelse(&path_to_entry); | |
140 | ret = -EIO; | |
141 | goto out; | |
142 | } | |
143 | ||
bd4c625c LT |
144 | if (!d_name[d_reclen - 1]) |
145 | d_reclen = strlen(d_name); | |
146 | ||
147 | if (d_reclen > | |
148 | REISERFS_MAX_NAME(inode->i_sb-> | |
149 | s_blocksize)) { | |
150 | /* too big to send back to VFS */ | |
151 | continue; | |
152 | } | |
153 | ||
154 | /* Ignore the .reiserfs_priv entry */ | |
99ce4169 | 155 | if (is_privroot_deh(inode, deh)) |
bd4c625c | 156 | continue; |
bd4c625c | 157 | |
4acf381e | 158 | ctx->pos = deh_offset(deh); |
bd4c625c LT |
159 | d_ino = deh_objectid(deh); |
160 | if (d_reclen <= 32) { | |
161 | local_buf = small_buf; | |
162 | } else { | |
d739b42b PE |
163 | local_buf = kmalloc(d_reclen, |
164 | GFP_NOFS); | |
bd4c625c LT |
165 | if (!local_buf) { |
166 | pathrelse(&path_to_entry); | |
167 | ret = -ENOMEM; | |
168 | goto out; | |
169 | } | |
170 | if (item_moved(&tmp_ih, &path_to_entry)) { | |
d739b42b | 171 | kfree(local_buf); |
bd4c625c LT |
172 | goto research; |
173 | } | |
174 | } | |
175 | // Note, that we copy name to user space via temporary | |
176 | // buffer (local_buf) because filldir will block if | |
177 | // user space buffer is swapped out. At that time | |
178 | // entry can move to somewhere else | |
179 | memcpy(local_buf, d_name, d_reclen); | |
8ebc4232 FW |
180 | |
181 | /* | |
182 | * Since filldir might sleep, we can release | |
183 | * the write lock here for other waiters | |
184 | */ | |
278f6679 | 185 | depth = reiserfs_write_unlock_nested(inode->i_sb); |
4acf381e AV |
186 | if (!dir_emit |
187 | (ctx, local_buf, d_reclen, d_ino, | |
188 | DT_UNKNOWN)) { | |
278f6679 | 189 | reiserfs_write_lock_nested(inode->i_sb, depth); |
bd4c625c | 190 | if (local_buf != small_buf) { |
d739b42b | 191 | kfree(local_buf); |
bd4c625c LT |
192 | } |
193 | goto end; | |
194 | } | |
278f6679 | 195 | reiserfs_write_lock_nested(inode->i_sb, depth); |
bd4c625c | 196 | if (local_buf != small_buf) { |
d739b42b | 197 | kfree(local_buf); |
bd4c625c LT |
198 | } |
199 | // next entry should be looked for with such offset | |
200 | next_pos = deh_offset(deh) + 1; | |
201 | ||
202 | if (item_moved(&tmp_ih, &path_to_entry)) { | |
0bdc7acb JM |
203 | set_cpu_key_k_offset(&pos_key, |
204 | next_pos); | |
bd4c625c LT |
205 | goto research; |
206 | } | |
207 | } /* for */ | |
1da177e4 LT |
208 | } |
209 | ||
bd4c625c LT |
210 | if (item_num != B_NR_ITEMS(bh) - 1) |
211 | // end of directory has been reached | |
212 | goto end; | |
213 | ||
214 | /* item we went through is last item of node. Using right | |
215 | delimiting key check is it directory end */ | |
216 | rkey = get_rkey(&path_to_entry, inode->i_sb); | |
217 | if (!comp_le_keys(rkey, &MIN_KEY)) { | |
218 | /* set pos_key to key, that is the smallest and greater | |
219 | that key of the last entry in the item */ | |
220 | set_cpu_key_k_offset(&pos_key, next_pos); | |
221 | continue; | |
222 | } | |
1da177e4 | 223 | |
bd4c625c LT |
224 | if (COMP_SHORT_KEYS(rkey, &pos_key)) { |
225 | // end of directory has been reached | |
226 | goto end; | |
1da177e4 | 227 | } |
bd4c625c LT |
228 | |
229 | /* directory continues in the right neighboring block */ | |
230 | set_cpu_key_k_offset(&pos_key, | |
231 | le_key_k_offset(KEY_FORMAT_3_5, rkey)); | |
232 | ||
233 | } /* while */ | |
234 | ||
a41f1a47 | 235 | end: |
4acf381e | 236 | ctx->pos = next_pos; |
bd4c625c LT |
237 | pathrelse(&path_to_entry); |
238 | reiserfs_check_path(&path_to_entry); | |
a41f1a47 | 239 | out: |
bd4c625c LT |
240 | reiserfs_write_unlock(inode->i_sb); |
241 | return ret; | |
1da177e4 LT |
242 | } |
243 | ||
4acf381e | 244 | static int reiserfs_readdir(struct file *file, struct dir_context *ctx) |
a41f1a47 | 245 | { |
cd62cdae | 246 | return reiserfs_readdir_inode(file_inode(file), ctx); |
a41f1a47 JM |
247 | } |
248 | ||
1da177e4 LT |
249 | /* compose directory item containing "." and ".." entries (entries are |
250 | not aligned to 4 byte boundary) */ | |
251 | /* the last four params are LE */ | |
bd4c625c LT |
252 | void make_empty_dir_item_v1(char *body, __le32 dirid, __le32 objid, |
253 | __le32 par_dirid, __le32 par_objid) | |
1da177e4 | 254 | { |
bd4c625c LT |
255 | struct reiserfs_de_head *deh; |
256 | ||
257 | memset(body, 0, EMPTY_DIR_SIZE_V1); | |
258 | deh = (struct reiserfs_de_head *)body; | |
259 | ||
260 | /* direntry header of "." */ | |
261 | put_deh_offset(&(deh[0]), DOT_OFFSET); | |
262 | /* these two are from make_le_item_head, and are are LE */ | |
263 | deh[0].deh_dir_id = dirid; | |
264 | deh[0].deh_objectid = objid; | |
265 | deh[0].deh_state = 0; /* Endian safe if 0 */ | |
266 | put_deh_location(&(deh[0]), EMPTY_DIR_SIZE_V1 - strlen(".")); | |
267 | mark_de_visible(&(deh[0])); | |
268 | ||
269 | /* direntry header of ".." */ | |
270 | put_deh_offset(&(deh[1]), DOT_DOT_OFFSET); | |
271 | /* key of ".." for the root directory */ | |
272 | /* these two are from the inode, and are are LE */ | |
273 | deh[1].deh_dir_id = par_dirid; | |
274 | deh[1].deh_objectid = par_objid; | |
275 | deh[1].deh_state = 0; /* Endian safe if 0 */ | |
276 | put_deh_location(&(deh[1]), deh_location(&(deh[0])) - strlen("..")); | |
277 | mark_de_visible(&(deh[1])); | |
278 | ||
279 | /* copy ".." and "." */ | |
280 | memcpy(body + deh_location(&(deh[0])), ".", 1); | |
281 | memcpy(body + deh_location(&(deh[1])), "..", 2); | |
1da177e4 LT |
282 | } |
283 | ||
284 | /* compose directory item containing "." and ".." entries */ | |
bd4c625c LT |
285 | void make_empty_dir_item(char *body, __le32 dirid, __le32 objid, |
286 | __le32 par_dirid, __le32 par_objid) | |
1da177e4 | 287 | { |
bd4c625c LT |
288 | struct reiserfs_de_head *deh; |
289 | ||
290 | memset(body, 0, EMPTY_DIR_SIZE); | |
291 | deh = (struct reiserfs_de_head *)body; | |
292 | ||
293 | /* direntry header of "." */ | |
294 | put_deh_offset(&(deh[0]), DOT_OFFSET); | |
295 | /* these two are from make_le_item_head, and are are LE */ | |
296 | deh[0].deh_dir_id = dirid; | |
297 | deh[0].deh_objectid = objid; | |
298 | deh[0].deh_state = 0; /* Endian safe if 0 */ | |
299 | put_deh_location(&(deh[0]), EMPTY_DIR_SIZE - ROUND_UP(strlen("."))); | |
300 | mark_de_visible(&(deh[0])); | |
301 | ||
302 | /* direntry header of ".." */ | |
303 | put_deh_offset(&(deh[1]), DOT_DOT_OFFSET); | |
304 | /* key of ".." for the root directory */ | |
305 | /* these two are from the inode, and are are LE */ | |
306 | deh[1].deh_dir_id = par_dirid; | |
307 | deh[1].deh_objectid = par_objid; | |
308 | deh[1].deh_state = 0; /* Endian safe if 0 */ | |
309 | put_deh_location(&(deh[1]), | |
310 | deh_location(&(deh[0])) - ROUND_UP(strlen(".."))); | |
311 | mark_de_visible(&(deh[1])); | |
312 | ||
313 | /* copy ".." and "." */ | |
314 | memcpy(body + deh_location(&(deh[0])), ".", 1); | |
315 | memcpy(body + deh_location(&(deh[1])), "..", 2); | |
1da177e4 | 316 | } |