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> | |
10 | #include <linux/smp_lock.h> | |
11 | #include <linux/buffer_head.h> | |
12 | #include <asm/uaccess.h> | |
13 | ||
bd4c625c | 14 | extern struct reiserfs_key MIN_KEY; |
1da177e4 | 15 | |
bd4c625c LT |
16 | static int reiserfs_readdir(struct file *, void *, filldir_t); |
17 | static int reiserfs_dir_fsync(struct file *filp, struct dentry *dentry, | |
18 | int datasync); | |
1da177e4 | 19 | |
4b6f5d20 | 20 | const struct file_operations reiserfs_dir_operations = { |
bd4c625c LT |
21 | .read = generic_read_dir, |
22 | .readdir = reiserfs_readdir, | |
23 | .fsync = reiserfs_dir_fsync, | |
24 | .ioctl = reiserfs_ioctl, | |
52b499c4 DH |
25 | #ifdef CONFIG_COMPAT |
26 | .compat_ioctl = reiserfs_compat_ioctl, | |
27 | #endif | |
1da177e4 LT |
28 | }; |
29 | ||
bd4c625c LT |
30 | static int reiserfs_dir_fsync(struct file *filp, struct dentry *dentry, |
31 | int datasync) | |
32 | { | |
33 | struct inode *inode = dentry->d_inode; | |
34 | int err; | |
35 | reiserfs_write_lock(inode->i_sb); | |
36 | err = reiserfs_commit_for_inode(inode); | |
37 | reiserfs_write_unlock(inode->i_sb); | |
38 | if (err < 0) | |
39 | return err; | |
40 | return 0; | |
1da177e4 LT |
41 | } |
42 | ||
1da177e4 LT |
43 | #define store_ih(where,what) copy_item_head (where, what) |
44 | ||
45 | // | |
bd4c625c | 46 | static int reiserfs_readdir(struct file *filp, void *dirent, filldir_t filldir) |
1da177e4 | 47 | { |
1fc5adbd | 48 | struct inode *inode = filp->f_path.dentry->d_inode; |
bd4c625c LT |
49 | struct cpu_key pos_key; /* key of current position in the directory (key of directory entry) */ |
50 | INITIALIZE_PATH(path_to_entry); | |
51 | struct buffer_head *bh; | |
52 | int item_num, entry_num; | |
53 | const struct reiserfs_key *rkey; | |
54 | struct item_head *ih, tmp_ih; | |
55 | int search_res; | |
56 | char *local_buf; | |
57 | loff_t next_pos; | |
58 | char small_buf[32]; /* avoid kmalloc if we can */ | |
59 | struct reiserfs_dir_entry de; | |
60 | int ret = 0; | |
61 | ||
62 | reiserfs_write_lock(inode->i_sb); | |
63 | ||
64 | reiserfs_check_lock_depth(inode->i_sb, "readdir"); | |
65 | ||
66 | /* form key for search the next directory entry using f_pos field of | |
67 | file structure */ | |
68 | make_cpu_key(&pos_key, inode, | |
69 | (filp->f_pos) ? (filp->f_pos) : DOT_OFFSET, TYPE_DIRENTRY, | |
70 | 3); | |
71 | next_pos = cpu_key_k_offset(&pos_key); | |
72 | ||
73 | /* reiserfs_warning (inode->i_sb, "reiserfs_readdir 1: f_pos = %Ld", filp->f_pos); */ | |
74 | ||
75 | path_to_entry.reada = PATH_READA; | |
76 | while (1) { | |
77 | research: | |
78 | /* search the directory item, containing entry with specified key */ | |
79 | search_res = | |
80 | search_by_entry_key(inode->i_sb, &pos_key, &path_to_entry, | |
81 | &de); | |
82 | if (search_res == IO_ERROR) { | |
83 | // FIXME: we could just skip part of directory which could | |
84 | // not be read | |
85 | ret = -EIO; | |
1da177e4 | 86 | goto out; |
1da177e4 | 87 | } |
bd4c625c LT |
88 | entry_num = de.de_entry_num; |
89 | bh = de.de_bh; | |
90 | item_num = de.de_item_num; | |
91 | ih = de.de_ih; | |
92 | store_ih(&tmp_ih, ih); | |
93 | ||
94 | /* we must have found item, that is item of this directory, */ | |
95 | RFALSE(COMP_SHORT_KEYS(&(ih->ih_key), &pos_key), | |
96 | "vs-9000: found item %h does not match to dir we readdir %K", | |
97 | ih, &pos_key); | |
98 | RFALSE(item_num > B_NR_ITEMS(bh) - 1, | |
99 | "vs-9005 item_num == %d, item amount == %d", | |
100 | item_num, B_NR_ITEMS(bh)); | |
101 | ||
102 | /* and entry must be not more than number of entries in the item */ | |
103 | RFALSE(I_ENTRY_COUNT(ih) < entry_num, | |
104 | "vs-9010: entry number is too big %d (%d)", | |
105 | entry_num, I_ENTRY_COUNT(ih)); | |
106 | ||
107 | if (search_res == POSITION_FOUND | |
108 | || entry_num < I_ENTRY_COUNT(ih)) { | |
109 | /* go through all entries in the directory item beginning from the entry, that has been found */ | |
110 | struct reiserfs_de_head *deh = | |
111 | B_I_DEH(bh, ih) + entry_num; | |
112 | ||
113 | for (; entry_num < I_ENTRY_COUNT(ih); | |
114 | entry_num++, deh++) { | |
115 | int d_reclen; | |
116 | char *d_name; | |
117 | off_t d_off; | |
118 | ino_t d_ino; | |
119 | ||
120 | if (!de_visible(deh)) | |
121 | /* it is hidden entry */ | |
122 | continue; | |
123 | d_reclen = entry_length(bh, ih, entry_num); | |
124 | d_name = B_I_DEH_ENTRY_FILE_NAME(bh, ih, deh); | |
125 | if (!d_name[d_reclen - 1]) | |
126 | d_reclen = strlen(d_name); | |
127 | ||
128 | if (d_reclen > | |
129 | REISERFS_MAX_NAME(inode->i_sb-> | |
130 | s_blocksize)) { | |
131 | /* too big to send back to VFS */ | |
132 | continue; | |
133 | } | |
134 | ||
135 | /* Ignore the .reiserfs_priv entry */ | |
136 | if (reiserfs_xattrs(inode->i_sb) && | |
137 | !old_format_only(inode->i_sb) && | |
1fc5adbd | 138 | filp->f_path.dentry == inode->i_sb->s_root && |
bd4c625c LT |
139 | REISERFS_SB(inode->i_sb)->priv_root && |
140 | REISERFS_SB(inode->i_sb)->priv_root->d_inode | |
141 | && deh_objectid(deh) == | |
142 | le32_to_cpu(INODE_PKEY | |
143 | (REISERFS_SB(inode->i_sb)-> | |
144 | priv_root->d_inode)-> | |
145 | k_objectid)) { | |
146 | continue; | |
147 | } | |
148 | ||
149 | d_off = deh_offset(deh); | |
150 | filp->f_pos = d_off; | |
151 | d_ino = deh_objectid(deh); | |
152 | if (d_reclen <= 32) { | |
153 | local_buf = small_buf; | |
154 | } else { | |
d739b42b PE |
155 | local_buf = kmalloc(d_reclen, |
156 | GFP_NOFS); | |
bd4c625c LT |
157 | if (!local_buf) { |
158 | pathrelse(&path_to_entry); | |
159 | ret = -ENOMEM; | |
160 | goto out; | |
161 | } | |
162 | if (item_moved(&tmp_ih, &path_to_entry)) { | |
d739b42b | 163 | kfree(local_buf); |
bd4c625c LT |
164 | goto research; |
165 | } | |
166 | } | |
167 | // Note, that we copy name to user space via temporary | |
168 | // buffer (local_buf) because filldir will block if | |
169 | // user space buffer is swapped out. At that time | |
170 | // entry can move to somewhere else | |
171 | memcpy(local_buf, d_name, d_reclen); | |
172 | if (filldir | |
173 | (dirent, local_buf, d_reclen, d_off, d_ino, | |
174 | DT_UNKNOWN) < 0) { | |
175 | if (local_buf != small_buf) { | |
d739b42b | 176 | kfree(local_buf); |
bd4c625c LT |
177 | } |
178 | goto end; | |
179 | } | |
180 | if (local_buf != small_buf) { | |
d739b42b | 181 | kfree(local_buf); |
bd4c625c LT |
182 | } |
183 | // next entry should be looked for with such offset | |
184 | next_pos = deh_offset(deh) + 1; | |
185 | ||
186 | if (item_moved(&tmp_ih, &path_to_entry)) { | |
187 | goto research; | |
188 | } | |
189 | } /* for */ | |
1da177e4 LT |
190 | } |
191 | ||
bd4c625c LT |
192 | if (item_num != B_NR_ITEMS(bh) - 1) |
193 | // end of directory has been reached | |
194 | goto end; | |
195 | ||
196 | /* item we went through is last item of node. Using right | |
197 | delimiting key check is it directory end */ | |
198 | rkey = get_rkey(&path_to_entry, inode->i_sb); | |
199 | if (!comp_le_keys(rkey, &MIN_KEY)) { | |
200 | /* set pos_key to key, that is the smallest and greater | |
201 | that key of the last entry in the item */ | |
202 | set_cpu_key_k_offset(&pos_key, next_pos); | |
203 | continue; | |
204 | } | |
1da177e4 | 205 | |
bd4c625c LT |
206 | if (COMP_SHORT_KEYS(rkey, &pos_key)) { |
207 | // end of directory has been reached | |
208 | goto end; | |
1da177e4 | 209 | } |
bd4c625c LT |
210 | |
211 | /* directory continues in the right neighboring block */ | |
212 | set_cpu_key_k_offset(&pos_key, | |
213 | le_key_k_offset(KEY_FORMAT_3_5, rkey)); | |
214 | ||
215 | } /* while */ | |
216 | ||
217 | end: | |
218 | filp->f_pos = next_pos; | |
219 | pathrelse(&path_to_entry); | |
220 | reiserfs_check_path(&path_to_entry); | |
221 | out: | |
222 | reiserfs_write_unlock(inode->i_sb); | |
223 | return ret; | |
1da177e4 LT |
224 | } |
225 | ||
226 | /* compose directory item containing "." and ".." entries (entries are | |
227 | not aligned to 4 byte boundary) */ | |
228 | /* the last four params are LE */ | |
bd4c625c LT |
229 | void make_empty_dir_item_v1(char *body, __le32 dirid, __le32 objid, |
230 | __le32 par_dirid, __le32 par_objid) | |
1da177e4 | 231 | { |
bd4c625c LT |
232 | struct reiserfs_de_head *deh; |
233 | ||
234 | memset(body, 0, EMPTY_DIR_SIZE_V1); | |
235 | deh = (struct reiserfs_de_head *)body; | |
236 | ||
237 | /* direntry header of "." */ | |
238 | put_deh_offset(&(deh[0]), DOT_OFFSET); | |
239 | /* these two are from make_le_item_head, and are are LE */ | |
240 | deh[0].deh_dir_id = dirid; | |
241 | deh[0].deh_objectid = objid; | |
242 | deh[0].deh_state = 0; /* Endian safe if 0 */ | |
243 | put_deh_location(&(deh[0]), EMPTY_DIR_SIZE_V1 - strlen(".")); | |
244 | mark_de_visible(&(deh[0])); | |
245 | ||
246 | /* direntry header of ".." */ | |
247 | put_deh_offset(&(deh[1]), DOT_DOT_OFFSET); | |
248 | /* key of ".." for the root directory */ | |
249 | /* these two are from the inode, and are are LE */ | |
250 | deh[1].deh_dir_id = par_dirid; | |
251 | deh[1].deh_objectid = par_objid; | |
252 | deh[1].deh_state = 0; /* Endian safe if 0 */ | |
253 | put_deh_location(&(deh[1]), deh_location(&(deh[0])) - strlen("..")); | |
254 | mark_de_visible(&(deh[1])); | |
255 | ||
256 | /* copy ".." and "." */ | |
257 | memcpy(body + deh_location(&(deh[0])), ".", 1); | |
258 | memcpy(body + deh_location(&(deh[1])), "..", 2); | |
1da177e4 LT |
259 | } |
260 | ||
261 | /* compose directory item containing "." and ".." entries */ | |
bd4c625c LT |
262 | void make_empty_dir_item(char *body, __le32 dirid, __le32 objid, |
263 | __le32 par_dirid, __le32 par_objid) | |
1da177e4 | 264 | { |
bd4c625c LT |
265 | struct reiserfs_de_head *deh; |
266 | ||
267 | memset(body, 0, EMPTY_DIR_SIZE); | |
268 | deh = (struct reiserfs_de_head *)body; | |
269 | ||
270 | /* direntry header of "." */ | |
271 | put_deh_offset(&(deh[0]), DOT_OFFSET); | |
272 | /* these two are from make_le_item_head, and are are LE */ | |
273 | deh[0].deh_dir_id = dirid; | |
274 | deh[0].deh_objectid = objid; | |
275 | deh[0].deh_state = 0; /* Endian safe if 0 */ | |
276 | put_deh_location(&(deh[0]), EMPTY_DIR_SIZE - ROUND_UP(strlen("."))); | |
277 | mark_de_visible(&(deh[0])); | |
278 | ||
279 | /* direntry header of ".." */ | |
280 | put_deh_offset(&(deh[1]), DOT_DOT_OFFSET); | |
281 | /* key of ".." for the root directory */ | |
282 | /* these two are from the inode, and are are LE */ | |
283 | deh[1].deh_dir_id = par_dirid; | |
284 | deh[1].deh_objectid = par_objid; | |
285 | deh[1].deh_state = 0; /* Endian safe if 0 */ | |
286 | put_deh_location(&(deh[1]), | |
287 | deh_location(&(deh[0])) - ROUND_UP(strlen(".."))); | |
288 | mark_de_visible(&(deh[1])); | |
289 | ||
290 | /* copy ".." and "." */ | |
291 | memcpy(body + deh_location(&(deh[0])), ".", 1); | |
292 | memcpy(body + deh_location(&(deh[1])), "..", 2); | |
1da177e4 | 293 | } |