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 | |
bd4c625c | 16 | static int reiserfs_readdir(struct file *, void *, filldir_t); |
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 LT |
22 | .read = generic_read_dir, |
23 | .readdir = reiserfs_readdir, | |
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 | ||
677c9b2e JM |
53 | static inline bool is_privroot_deh(struct dentry *dir, |
54 | struct reiserfs_de_head *deh) | |
55 | { | |
677c9b2e | 56 | struct dentry *privroot = REISERFS_SB(dir->d_sb)->priv_root; |
73422811 JM |
57 | return (dir == dir->d_parent && privroot->d_inode && |
58 | deh->deh_objectid == INODE_PKEY(privroot->d_inode)->k_objectid); | |
677c9b2e JM |
59 | } |
60 | ||
a41f1a47 JM |
61 | int reiserfs_readdir_dentry(struct dentry *dentry, void *dirent, |
62 | filldir_t filldir, loff_t *pos) | |
1da177e4 | 63 | { |
a41f1a47 | 64 | struct inode *inode = dentry->d_inode; |
bd4c625c LT |
65 | 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; | |
77 | ||
78 | reiserfs_write_lock(inode->i_sb); | |
79 | ||
80 | reiserfs_check_lock_depth(inode->i_sb, "readdir"); | |
81 | ||
82 | /* form key for search the next directory entry using f_pos field of | |
83 | file structure */ | |
a41f1a47 | 84 | make_cpu_key(&pos_key, inode, *pos ?: DOT_OFFSET, TYPE_DIRENTRY, 3); |
bd4c625c LT |
85 | next_pos = cpu_key_k_offset(&pos_key); |
86 | ||
bd4c625c LT |
87 | 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; | |
1da177e4 | 98 | goto out; |
1da177e4 | 99 | } |
bd4c625c LT |
100 | 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); | |
80eb68d2 LW |
137 | |
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 | ||
bd4c625c LT |
147 | 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 */ | |
677c9b2e | 158 | if (is_privroot_deh(dentry, deh)) |
bd4c625c | 159 | continue; |
bd4c625c LT |
160 | |
161 | d_off = deh_offset(deh); | |
a41f1a47 | 162 | *pos = d_off; |
bd4c625c LT |
163 | d_ino = deh_objectid(deh); |
164 | if (d_reclen <= 32) { | |
165 | local_buf = small_buf; | |
166 | } else { | |
d739b42b PE |
167 | local_buf = kmalloc(d_reclen, |
168 | GFP_NOFS); | |
bd4c625c LT |
169 | if (!local_buf) { |
170 | pathrelse(&path_to_entry); | |
171 | ret = -ENOMEM; | |
172 | goto out; | |
173 | } | |
174 | if (item_moved(&tmp_ih, &path_to_entry)) { | |
d739b42b | 175 | kfree(local_buf); |
bd4c625c LT |
176 | 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); | |
8ebc4232 FW |
184 | |
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); | |
bd4c625c LT |
190 | if (filldir |
191 | (dirent, local_buf, d_reclen, d_off, d_ino, | |
192 | DT_UNKNOWN) < 0) { | |
8ebc4232 | 193 | reiserfs_write_lock(inode->i_sb); |
bd4c625c | 194 | if (local_buf != small_buf) { |
d739b42b | 195 | kfree(local_buf); |
bd4c625c LT |
196 | } |
197 | goto end; | |
198 | } | |
8ebc4232 | 199 | reiserfs_write_lock(inode->i_sb); |
bd4c625c | 200 | if (local_buf != small_buf) { |
d739b42b | 201 | kfree(local_buf); |
bd4c625c LT |
202 | } |
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 */ | |
1da177e4 LT |
210 | } |
211 | ||
bd4c625c LT |
212 | if (item_num != B_NR_ITEMS(bh) - 1) |
213 | // end of directory has been reached | |
214 | goto end; | |
215 | ||
216 | /* 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; | |
224 | } | |
1da177e4 | 225 | |
bd4c625c LT |
226 | if (COMP_SHORT_KEYS(rkey, &pos_key)) { |
227 | // end of directory has been reached | |
228 | goto end; | |
1da177e4 | 229 | } |
bd4c625c LT |
230 | |
231 | /* 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)); | |
234 | ||
235 | } /* while */ | |
236 | ||
a41f1a47 JM |
237 | end: |
238 | *pos = next_pos; | |
bd4c625c LT |
239 | pathrelse(&path_to_entry); |
240 | reiserfs_check_path(&path_to_entry); | |
a41f1a47 | 241 | out: |
bd4c625c LT |
242 | reiserfs_write_unlock(inode->i_sb); |
243 | return ret; | |
1da177e4 LT |
244 | } |
245 | ||
a41f1a47 JM |
246 | static 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 | ||
1da177e4 LT |
252 | /* compose directory item containing "." and ".." entries (entries are |
253 | not aligned to 4 byte boundary) */ | |
254 | /* the last four params are LE */ | |
bd4c625c LT |
255 | void make_empty_dir_item_v1(char *body, __le32 dirid, __le32 objid, |
256 | __le32 par_dirid, __le32 par_objid) | |
1da177e4 | 257 | { |
bd4c625c LT |
258 | struct reiserfs_de_head *deh; |
259 | ||
260 | memset(body, 0, EMPTY_DIR_SIZE_V1); | |
261 | deh = (struct reiserfs_de_head *)body; | |
262 | ||
263 | /* 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); | |
1da177e4 LT |
285 | } |
286 | ||
287 | /* compose directory item containing "." and ".." entries */ | |
bd4c625c LT |
288 | void make_empty_dir_item(char *body, __le32 dirid, __le32 objid, |
289 | __le32 par_dirid, __le32 par_objid) | |
1da177e4 | 290 | { |
bd4c625c LT |
291 | struct reiserfs_de_head *deh; |
292 | ||
293 | memset(body, 0, EMPTY_DIR_SIZE); | |
294 | deh = (struct reiserfs_de_head *)body; | |
295 | ||
296 | /* 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); | |
1da177e4 | 319 | } |