2 * Copyright 2000 by Hans Reiser, licensing governed by reiserfs/README
5 #include <linux/string.h>
6 #include <linux/errno.h>
9 #include <linux/stat.h>
10 #include <linux/buffer_head.h>
11 #include <linux/slab.h>
12 #include <asm/uaccess.h>
14 extern const struct reiserfs_key MIN_KEY
;
16 static int reiserfs_readdir(struct file
*, struct dir_context
*);
17 static int reiserfs_dir_fsync(struct file
*filp
, loff_t start
, loff_t end
,
20 const struct file_operations reiserfs_dir_operations
= {
21 .llseek
= generic_file_llseek
,
22 .read
= generic_read_dir
,
23 .iterate
= reiserfs_readdir
,
24 .fsync
= reiserfs_dir_fsync
,
25 .unlocked_ioctl
= reiserfs_ioctl
,
27 .compat_ioctl
= reiserfs_compat_ioctl
,
31 static int reiserfs_dir_fsync(struct file
*filp
, loff_t start
, loff_t end
,
34 struct inode
*inode
= filp
->f_mapping
->host
;
37 err
= filemap_write_and_wait_range(inode
->i_mapping
, start
, end
);
41 mutex_lock(&inode
->i_mutex
);
42 reiserfs_write_lock(inode
->i_sb
);
43 err
= reiserfs_commit_for_inode(inode
);
44 reiserfs_write_unlock(inode
->i_sb
);
45 mutex_unlock(&inode
->i_mutex
);
51 #define store_ih(where,what) copy_item_head (where, what)
53 static inline bool is_privroot_deh(struct inode
*dir
, struct reiserfs_de_head
*deh
)
55 struct dentry
*privroot
= REISERFS_SB(dir
->i_sb
)->priv_root
;
56 return (privroot
->d_inode
&&
57 deh
->deh_objectid
== INODE_PKEY(privroot
->d_inode
)->k_objectid
);
60 int reiserfs_readdir_inode(struct inode
*inode
, struct dir_context
*ctx
)
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
;
71 char small_buf
[32]; /* avoid kmalloc if we can */
72 struct reiserfs_dir_entry de
;
76 reiserfs_write_lock(inode
->i_sb
);
78 reiserfs_check_lock_depth(inode
->i_sb
, "readdir");
80 /* form key for search the next directory entry using f_pos field of
82 make_cpu_key(&pos_key
, inode
, ctx
->pos
?: DOT_OFFSET
, TYPE_DIRENTRY
, 3);
83 next_pos
= cpu_key_k_offset(&pos_key
);
85 path_to_entry
.reada
= PATH_READA
;
88 /* search the directory item, containing entry with specified key */
90 search_by_entry_key(inode
->i_sb
, &pos_key
, &path_to_entry
,
92 if (search_res
== IO_ERROR
) {
93 // FIXME: we could just skip part of directory which could
98 entry_num
= de
.de_entry_num
;
100 item_num
= de
.de_item_num
;
102 store_ih(&tmp_ih
, ih
);
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",
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
));
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
));
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
;
123 for (; entry_num
< I_ENTRY_COUNT(ih
);
124 entry_num
++, deh
++) {
129 if (!de_visible(deh
))
130 /* it is hidden entry */
132 d_reclen
= entry_length(bh
, ih
, entry_num
);
133 d_name
= B_I_DEH_ENTRY_FILE_NAME(bh
, ih
, deh
);
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
);
144 if (!d_name
[d_reclen
- 1])
145 d_reclen
= strlen(d_name
);
148 REISERFS_MAX_NAME(inode
->i_sb
->
150 /* too big to send back to VFS */
154 /* Ignore the .reiserfs_priv entry */
155 if (is_privroot_deh(inode
, deh
))
158 ctx
->pos
= deh_offset(deh
);
159 d_ino
= deh_objectid(deh
);
160 if (d_reclen
<= 32) {
161 local_buf
= small_buf
;
163 local_buf
= kmalloc(d_reclen
,
166 pathrelse(&path_to_entry
);
170 if (item_moved(&tmp_ih
, &path_to_entry
)) {
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
);
182 * Since filldir might sleep, we can release
183 * the write lock here for other waiters
185 depth
= reiserfs_write_unlock_nested(inode
->i_sb
);
187 (ctx
, local_buf
, d_reclen
, d_ino
,
189 reiserfs_write_lock_nested(inode
->i_sb
, depth
);
190 if (local_buf
!= small_buf
) {
195 reiserfs_write_lock_nested(inode
->i_sb
, depth
);
196 if (local_buf
!= small_buf
) {
199 // next entry should be looked for with such offset
200 next_pos
= deh_offset(deh
) + 1;
202 if (item_moved(&tmp_ih
, &path_to_entry
)) {
203 set_cpu_key_k_offset(&pos_key
,
210 if (item_num
!= B_NR_ITEMS(bh
) - 1)
211 // end of directory has been reached
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
);
224 if (COMP_SHORT_KEYS(rkey
, &pos_key
)) {
225 // end of directory has been reached
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
));
237 pathrelse(&path_to_entry
);
238 reiserfs_check_path(&path_to_entry
);
240 reiserfs_write_unlock(inode
->i_sb
);
244 static int reiserfs_readdir(struct file
*file
, struct dir_context
*ctx
)
246 return reiserfs_readdir_inode(file_inode(file
), ctx
);
249 /* compose directory item containing "." and ".." entries (entries are
250 not aligned to 4 byte boundary) */
251 /* the last four params are LE */
252 void make_empty_dir_item_v1(char *body
, __le32 dirid
, __le32 objid
,
253 __le32 par_dirid
, __le32 par_objid
)
255 struct reiserfs_de_head
*deh
;
257 memset(body
, 0, EMPTY_DIR_SIZE_V1
);
258 deh
= (struct reiserfs_de_head
*)body
;
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]));
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]));
279 /* copy ".." and "." */
280 memcpy(body
+ deh_location(&(deh
[0])), ".", 1);
281 memcpy(body
+ deh_location(&(deh
[1])), "..", 2);
284 /* compose directory item containing "." and ".." entries */
285 void make_empty_dir_item(char *body
, __le32 dirid
, __le32 objid
,
286 __le32 par_dirid
, __le32 par_objid
)
288 struct reiserfs_de_head
*deh
;
290 memset(body
, 0, EMPTY_DIR_SIZE
);
291 deh
= (struct reiserfs_de_head
*)body
;
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]));
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]));
313 /* copy ".." and "." */
314 memcpy(body
+ deh_location(&(deh
[0])), ".", 1);
315 memcpy(body
+ deh_location(&(deh
[1])), "..", 2);