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> | |
8 | #include <linux/reiserfs_fs.h> | |
9 | #include <linux/stat.h> | |
1da177e4 LT |
10 | #include <linux/buffer_head.h> |
11 | #include <asm/uaccess.h> | |
12 | ||
bd4c625c | 13 | extern struct reiserfs_key MIN_KEY; |
1da177e4 | 14 | |
bd4c625c LT |
15 | static int reiserfs_readdir(struct file *, void *, filldir_t); |
16 | static int reiserfs_dir_fsync(struct file *filp, struct dentry *dentry, | |
17 | int datasync); | |
1da177e4 | 18 | |
4b6f5d20 | 19 | const struct file_operations reiserfs_dir_operations = { |
bd4c625c LT |
20 | .read = generic_read_dir, |
21 | .readdir = reiserfs_readdir, | |
22 | .fsync = reiserfs_dir_fsync, | |
23 | .ioctl = reiserfs_ioctl, | |
52b499c4 DH |
24 | #ifdef CONFIG_COMPAT |
25 | .compat_ioctl = reiserfs_compat_ioctl, | |
26 | #endif | |
1da177e4 LT |
27 | }; |
28 | ||
bd4c625c LT |
29 | static 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; | |
1da177e4 LT |
40 | } |
41 | ||
1da177e4 LT |
42 | #define store_ih(where,what) copy_item_head (where, what) |
43 | ||
44 | // | |
bd4c625c | 45 | static int reiserfs_readdir(struct file *filp, void *dirent, filldir_t filldir) |
1da177e4 | 46 | { |
1fc5adbd | 47 | struct inode *inode = filp->f_path.dentry->d_inode; |
bd4c625c LT |
48 | 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; | |
60 | ||
61 | reiserfs_write_lock(inode->i_sb); | |
62 | ||
63 | reiserfs_check_lock_depth(inode->i_sb, "readdir"); | |
64 | ||
65 | /* 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); | |
71 | ||
72 | /* reiserfs_warning (inode->i_sb, "reiserfs_readdir 1: f_pos = %Ld", filp->f_pos); */ | |
73 | ||
74 | 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; | |
1da177e4 | 85 | goto out; |
1da177e4 | 86 | } |
bd4c625c LT |
87 | 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) && | |
1fc5adbd | 137 | filp->f_path.dentry == inode->i_sb->s_root && |
bd4c625c LT |
138 | 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 { | |
d739b42b PE |
154 | local_buf = kmalloc(d_reclen, |
155 | GFP_NOFS); | |
bd4c625c LT |
156 | if (!local_buf) { |
157 | pathrelse(&path_to_entry); | |
158 | ret = -ENOMEM; | |
159 | goto out; | |
160 | } | |
161 | if (item_moved(&tmp_ih, &path_to_entry)) { | |
d739b42b | 162 | kfree(local_buf); |
bd4c625c LT |
163 | 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) { | |
d739b42b | 175 | kfree(local_buf); |
bd4c625c LT |
176 | } |
177 | goto end; | |
178 | } | |
179 | if (local_buf != small_buf) { | |
d739b42b | 180 | kfree(local_buf); |
bd4c625c LT |
181 | } |
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 */ | |
1da177e4 LT |
189 | } |
190 | ||
bd4c625c LT |
191 | if (item_num != B_NR_ITEMS(bh) - 1) |
192 | // end of directory has been reached | |
193 | goto end; | |
194 | ||
195 | /* 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; | |
203 | } | |
1da177e4 | 204 | |
bd4c625c LT |
205 | if (COMP_SHORT_KEYS(rkey, &pos_key)) { |
206 | // end of directory has been reached | |
207 | goto end; | |
1da177e4 | 208 | } |
bd4c625c LT |
209 | |
210 | /* 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)); | |
213 | ||
214 | } /* while */ | |
215 | ||
216 | 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; | |
1da177e4 LT |
223 | } |
224 | ||
225 | /* compose directory item containing "." and ".." entries (entries are | |
226 | not aligned to 4 byte boundary) */ | |
227 | /* the last four params are LE */ | |
bd4c625c LT |
228 | void make_empty_dir_item_v1(char *body, __le32 dirid, __le32 objid, |
229 | __le32 par_dirid, __le32 par_objid) | |
1da177e4 | 230 | { |
bd4c625c LT |
231 | struct reiserfs_de_head *deh; |
232 | ||
233 | memset(body, 0, EMPTY_DIR_SIZE_V1); | |
234 | deh = (struct reiserfs_de_head *)body; | |
235 | ||
236 | /* 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); | |
1da177e4 LT |
258 | } |
259 | ||
260 | /* compose directory item containing "." and ".." entries */ | |
bd4c625c LT |
261 | void make_empty_dir_item(char *body, __le32 dirid, __le32 objid, |
262 | __le32 par_dirid, __le32 par_objid) | |
1da177e4 | 263 | { |
bd4c625c LT |
264 | struct reiserfs_de_head *deh; |
265 | ||
266 | memset(body, 0, EMPTY_DIR_SIZE); | |
267 | deh = (struct reiserfs_de_head *)body; | |
268 | ||
269 | /* 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); | |
1da177e4 | 292 | } |