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-rw-r--r--fs/reiserfs/dir.c488
1 files changed, 255 insertions, 233 deletions
diff --git a/fs/reiserfs/dir.c b/fs/reiserfs/dir.c
index fbde4b01a32..9dd71e80703 100644
--- a/fs/reiserfs/dir.c
+++ b/fs/reiserfs/dir.c
@@ -12,264 +12,286 @@
12#include <linux/buffer_head.h> 12#include <linux/buffer_head.h>
13#include <asm/uaccess.h> 13#include <asm/uaccess.h>
14 14
15extern struct reiserfs_key MIN_KEY; 15extern struct reiserfs_key MIN_KEY;
16 16
17static int reiserfs_readdir (struct file *, void *, filldir_t); 17static int reiserfs_readdir(struct file *, void *, filldir_t);
18static int reiserfs_dir_fsync(struct file *filp, struct dentry *dentry, int datasync) ; 18static int reiserfs_dir_fsync(struct file *filp, struct dentry *dentry,
19 int datasync);
19 20
20struct file_operations reiserfs_dir_operations = { 21struct file_operations reiserfs_dir_operations = {
21 .read = generic_read_dir, 22 .read = generic_read_dir,
22 .readdir = reiserfs_readdir, 23 .readdir = reiserfs_readdir,
23 .fsync = reiserfs_dir_fsync, 24 .fsync = reiserfs_dir_fsync,
24 .ioctl = reiserfs_ioctl, 25 .ioctl = reiserfs_ioctl,
25}; 26};
26 27
27static int reiserfs_dir_fsync(struct file *filp, struct dentry *dentry, int datasync) { 28static int reiserfs_dir_fsync(struct file *filp, struct dentry *dentry,
28 struct inode *inode = dentry->d_inode; 29 int datasync)
29 int err; 30{
30 reiserfs_write_lock(inode->i_sb); 31 struct inode *inode = dentry->d_inode;
31 err = reiserfs_commit_for_inode(inode) ; 32 int err;
32 reiserfs_write_unlock(inode->i_sb) ; 33 reiserfs_write_lock(inode->i_sb);
33 if (err < 0) 34 err = reiserfs_commit_for_inode(inode);
34 return err; 35 reiserfs_write_unlock(inode->i_sb);
35 return 0; 36 if (err < 0)
37 return err;
38 return 0;
36} 39}
37 40
38
39#define store_ih(where,what) copy_item_head (where, what) 41#define store_ih(where,what) copy_item_head (where, what)
40 42
41// 43//
42static int reiserfs_readdir (struct file * filp, void * dirent, filldir_t filldir) 44static int reiserfs_readdir(struct file *filp, void *dirent, filldir_t filldir)
43{ 45{
44 struct inode *inode = filp->f_dentry->d_inode; 46 struct inode *inode = filp->f_dentry->d_inode;
45 struct cpu_key pos_key; /* key of current position in the directory (key of directory entry) */ 47 struct cpu_key pos_key; /* key of current position in the directory (key of directory entry) */
46 INITIALIZE_PATH (path_to_entry); 48 INITIALIZE_PATH(path_to_entry);
47 struct buffer_head * bh; 49 struct buffer_head *bh;
48 int item_num, entry_num; 50 int item_num, entry_num;
49 const struct reiserfs_key * rkey; 51 const struct reiserfs_key *rkey;
50 struct item_head * ih, tmp_ih; 52 struct item_head *ih, tmp_ih;
51 int search_res; 53 int search_res;
52 char * local_buf; 54 char *local_buf;
53 loff_t next_pos; 55 loff_t next_pos;
54 char small_buf[32] ; /* avoid kmalloc if we can */ 56 char small_buf[32]; /* avoid kmalloc if we can */
55 struct reiserfs_dir_entry de; 57 struct reiserfs_dir_entry de;
56 int ret = 0; 58 int ret = 0;
57 59
58 reiserfs_write_lock(inode->i_sb); 60 reiserfs_write_lock(inode->i_sb);
59 61
60 reiserfs_check_lock_depth(inode->i_sb, "readdir") ; 62 reiserfs_check_lock_depth(inode->i_sb, "readdir");
61 63
62 /* form key for search the next directory entry using f_pos field of 64 /* form key for search the next directory entry using f_pos field of
63 file structure */ 65 file structure */
64 make_cpu_key (&pos_key, inode, (filp->f_pos) ? (filp->f_pos) : DOT_OFFSET, 66 make_cpu_key(&pos_key, inode,
65 TYPE_DIRENTRY, 3); 67 (filp->f_pos) ? (filp->f_pos) : DOT_OFFSET, TYPE_DIRENTRY,
66 next_pos = cpu_key_k_offset (&pos_key); 68 3);
67 69 next_pos = cpu_key_k_offset(&pos_key);
68 /* reiserfs_warning (inode->i_sb, "reiserfs_readdir 1: f_pos = %Ld", filp->f_pos);*/ 70
69 71 /* reiserfs_warning (inode->i_sb, "reiserfs_readdir 1: f_pos = %Ld", filp->f_pos); */
70 path_to_entry.reada = PATH_READA; 72
71 while (1) { 73 path_to_entry.reada = PATH_READA;
72 research: 74 while (1) {
73 /* search the directory item, containing entry with specified key */ 75 research:
74 search_res = search_by_entry_key (inode->i_sb, &pos_key, &path_to_entry, &de); 76 /* search the directory item, containing entry with specified key */
75 if (search_res == IO_ERROR) { 77 search_res =
76 // FIXME: we could just skip part of directory which could 78 search_by_entry_key(inode->i_sb, &pos_key, &path_to_entry,
77 // not be read 79 &de);
78 ret = -EIO; 80 if (search_res == IO_ERROR) {
79 goto out; 81 // FIXME: we could just skip part of directory which could
80 } 82 // not be read
81 entry_num = de.de_entry_num; 83 ret = -EIO;
82 bh = de.de_bh;
83 item_num = de.de_item_num;
84 ih = de.de_ih;
85 store_ih (&tmp_ih, ih);
86
87 /* we must have found item, that is item of this directory, */
88 RFALSE( COMP_SHORT_KEYS (&(ih->ih_key), &pos_key),
89 "vs-9000: found item %h does not match to dir we readdir %K",
90 ih, &pos_key);
91 RFALSE( item_num > B_NR_ITEMS (bh) - 1,
92 "vs-9005 item_num == %d, item amount == %d",
93 item_num, B_NR_ITEMS (bh));
94
95 /* and entry must be not more than number of entries in the item */
96 RFALSE( I_ENTRY_COUNT (ih) < entry_num,
97 "vs-9010: entry number is too big %d (%d)",
98 entry_num, I_ENTRY_COUNT (ih));
99
100 if (search_res == POSITION_FOUND || entry_num < I_ENTRY_COUNT (ih)) {
101 /* go through all entries in the directory item beginning from the entry, that has been found */
102 struct reiserfs_de_head * deh = B_I_DEH (bh, ih) + entry_num;
103
104 for (; entry_num < I_ENTRY_COUNT (ih); entry_num ++, deh ++) {
105 int d_reclen;
106 char * d_name;
107 off_t d_off;
108 ino_t d_ino;
109
110 if (!de_visible (deh))
111 /* it is hidden entry */
112 continue;
113 d_reclen = entry_length (bh, ih, entry_num);
114 d_name = B_I_DEH_ENTRY_FILE_NAME (bh, ih, deh);
115 if (!d_name[d_reclen - 1])
116 d_reclen = strlen (d_name);
117
118 if (d_reclen > REISERFS_MAX_NAME(inode->i_sb->s_blocksize)){
119 /* too big to send back to VFS */
120 continue ;
121 }
122
123 /* Ignore the .reiserfs_priv entry */
124 if (reiserfs_xattrs (inode->i_sb) &&
125 !old_format_only(inode->i_sb) &&
126 filp->f_dentry == inode->i_sb->s_root &&
127 REISERFS_SB(inode->i_sb)->priv_root &&
128 REISERFS_SB(inode->i_sb)->priv_root->d_inode &&
129 deh_objectid(deh) == le32_to_cpu (INODE_PKEY(REISERFS_SB(inode->i_sb)->priv_root->d_inode)->k_objectid)) {
130 continue;
131 }
132
133 d_off = deh_offset (deh);
134 filp->f_pos = d_off ;
135 d_ino = deh_objectid (deh);
136 if (d_reclen <= 32) {
137 local_buf = small_buf ;
138 } else {
139 local_buf = reiserfs_kmalloc(d_reclen, GFP_NOFS, inode->i_sb) ;
140 if (!local_buf) {
141 pathrelse (&path_to_entry);
142 ret = -ENOMEM ;
143 goto out; 84 goto out;
144 }
145 if (item_moved (&tmp_ih, &path_to_entry)) {
146 reiserfs_kfree(local_buf, d_reclen, inode->i_sb) ;
147 goto research;
148 }
149 }
150 // Note, that we copy name to user space via temporary
151 // buffer (local_buf) because filldir will block if
152 // user space buffer is swapped out. At that time
153 // entry can move to somewhere else
154 memcpy (local_buf, d_name, d_reclen);
155 if (filldir (dirent, local_buf, d_reclen, d_off, d_ino,
156 DT_UNKNOWN) < 0) {
157 if (local_buf != small_buf) {
158 reiserfs_kfree(local_buf, d_reclen, inode->i_sb) ;
159 }
160 goto end;
161 } 85 }
162 if (local_buf != small_buf) { 86 entry_num = de.de_entry_num;
163 reiserfs_kfree(local_buf, d_reclen, inode->i_sb) ; 87 bh = de.de_bh;
88 item_num = de.de_item_num;
89 ih = de.de_ih;
90 store_ih(&tmp_ih, ih);
91
92 /* we must have found item, that is item of this directory, */
93 RFALSE(COMP_SHORT_KEYS(&(ih->ih_key), &pos_key),
94 "vs-9000: found item %h does not match to dir we readdir %K",
95 ih, &pos_key);
96 RFALSE(item_num > B_NR_ITEMS(bh) - 1,
97 "vs-9005 item_num == %d, item amount == %d",
98 item_num, B_NR_ITEMS(bh));
99
100 /* and entry must be not more than number of entries in the item */
101 RFALSE(I_ENTRY_COUNT(ih) < entry_num,
102 "vs-9010: entry number is too big %d (%d)",
103 entry_num, I_ENTRY_COUNT(ih));
104
105 if (search_res == POSITION_FOUND
106 || entry_num < I_ENTRY_COUNT(ih)) {
107 /* go through all entries in the directory item beginning from the entry, that has been found */
108 struct reiserfs_de_head *deh =
109 B_I_DEH(bh, ih) + entry_num;
110
111 for (; entry_num < I_ENTRY_COUNT(ih);
112 entry_num++, deh++) {
113 int d_reclen;
114 char *d_name;
115 off_t d_off;
116 ino_t d_ino;
117
118 if (!de_visible(deh))
119 /* it is hidden entry */
120 continue;
121 d_reclen = entry_length(bh, ih, entry_num);
122 d_name = B_I_DEH_ENTRY_FILE_NAME(bh, ih, deh);
123 if (!d_name[d_reclen - 1])
124 d_reclen = strlen(d_name);
125
126 if (d_reclen >
127 REISERFS_MAX_NAME(inode->i_sb->
128 s_blocksize)) {
129 /* too big to send back to VFS */
130 continue;
131 }
132
133 /* Ignore the .reiserfs_priv entry */
134 if (reiserfs_xattrs(inode->i_sb) &&
135 !old_format_only(inode->i_sb) &&
136 filp->f_dentry == inode->i_sb->s_root &&
137 REISERFS_SB(inode->i_sb)->priv_root &&
138 REISERFS_SB(inode->i_sb)->priv_root->d_inode
139 && deh_objectid(deh) ==
140 le32_to_cpu(INODE_PKEY
141 (REISERFS_SB(inode->i_sb)->
142 priv_root->d_inode)->
143 k_objectid)) {
144 continue;
145 }
146
147 d_off = deh_offset(deh);
148 filp->f_pos = d_off;
149 d_ino = deh_objectid(deh);
150 if (d_reclen <= 32) {
151 local_buf = small_buf;
152 } else {
153 local_buf =
154 reiserfs_kmalloc(d_reclen, GFP_NOFS,
155 inode->i_sb);
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)) {
162 reiserfs_kfree(local_buf,
163 d_reclen,
164 inode->i_sb);
165 goto research;
166 }
167 }
168 // Note, that we copy name to user space via temporary
169 // buffer (local_buf) because filldir will block if
170 // user space buffer is swapped out. At that time
171 // entry can move to somewhere else
172 memcpy(local_buf, d_name, d_reclen);
173 if (filldir
174 (dirent, local_buf, d_reclen, d_off, d_ino,
175 DT_UNKNOWN) < 0) {
176 if (local_buf != small_buf) {
177 reiserfs_kfree(local_buf,
178 d_reclen,
179 inode->i_sb);
180 }
181 goto end;
182 }
183 if (local_buf != small_buf) {
184 reiserfs_kfree(local_buf, d_reclen,
185 inode->i_sb);
186 }
187 // next entry should be looked for with such offset
188 next_pos = deh_offset(deh) + 1;
189
190 if (item_moved(&tmp_ih, &path_to_entry)) {
191 goto research;
192 }
193 } /* for */
164 } 194 }
165 195
166 // next entry should be looked for with such offset 196 if (item_num != B_NR_ITEMS(bh) - 1)
167 next_pos = deh_offset (deh) + 1; 197 // end of directory has been reached
198 goto end;
199
200 /* item we went through is last item of node. Using right
201 delimiting key check is it directory end */
202 rkey = get_rkey(&path_to_entry, inode->i_sb);
203 if (!comp_le_keys(rkey, &MIN_KEY)) {
204 /* set pos_key to key, that is the smallest and greater
205 that key of the last entry in the item */
206 set_cpu_key_k_offset(&pos_key, next_pos);
207 continue;
208 }
168 209
169 if (item_moved (&tmp_ih, &path_to_entry)) { 210 if (COMP_SHORT_KEYS(rkey, &pos_key)) {
170 goto research; 211 // end of directory has been reached
212 goto end;
171 } 213 }
172 } /* for */ 214
173 } 215 /* directory continues in the right neighboring block */
174 216 set_cpu_key_k_offset(&pos_key,
175 if (item_num != B_NR_ITEMS (bh) - 1) 217 le_key_k_offset(KEY_FORMAT_3_5, rkey));
176 // end of directory has been reached 218
177 goto end; 219 } /* while */
178 220
179 /* item we went through is last item of node. Using right 221 end:
180 delimiting key check is it directory end */ 222 filp->f_pos = next_pos;
181 rkey = get_rkey (&path_to_entry, inode->i_sb); 223 pathrelse(&path_to_entry);
182 if (! comp_le_keys (rkey, &MIN_KEY)) { 224 reiserfs_check_path(&path_to_entry);
183 /* set pos_key to key, that is the smallest and greater 225 out:
184 that key of the last entry in the item */ 226 reiserfs_write_unlock(inode->i_sb);
185 set_cpu_key_k_offset (&pos_key, next_pos); 227 return ret;
186 continue;
187 }
188
189 if ( COMP_SHORT_KEYS (rkey, &pos_key)) {
190 // end of directory has been reached
191 goto end;
192 }
193
194 /* directory continues in the right neighboring block */
195 set_cpu_key_k_offset (&pos_key, le_key_k_offset (KEY_FORMAT_3_5, rkey));
196
197 } /* while */
198
199
200 end:
201 filp->f_pos = next_pos;
202 pathrelse (&path_to_entry);
203 reiserfs_check_path(&path_to_entry) ;
204 out:
205 reiserfs_write_unlock(inode->i_sb);
206 return ret;
207} 228}
208 229
209/* compose directory item containing "." and ".." entries (entries are 230/* compose directory item containing "." and ".." entries (entries are
210 not aligned to 4 byte boundary) */ 231 not aligned to 4 byte boundary) */
211/* the last four params are LE */ 232/* the last four params are LE */
212void make_empty_dir_item_v1 (char * body, __le32 dirid, __le32 objid, 233void make_empty_dir_item_v1(char *body, __le32 dirid, __le32 objid,
213 __le32 par_dirid, __le32 par_objid) 234 __le32 par_dirid, __le32 par_objid)
214{ 235{
215 struct reiserfs_de_head * deh; 236 struct reiserfs_de_head *deh;
216 237
217 memset (body, 0, EMPTY_DIR_SIZE_V1); 238 memset(body, 0, EMPTY_DIR_SIZE_V1);
218 deh = (struct reiserfs_de_head *)body; 239 deh = (struct reiserfs_de_head *)body;
219 240
220 /* direntry header of "." */ 241 /* direntry header of "." */
221 put_deh_offset( &(deh[0]), DOT_OFFSET ); 242 put_deh_offset(&(deh[0]), DOT_OFFSET);
222 /* these two are from make_le_item_head, and are are LE */ 243 /* these two are from make_le_item_head, and are are LE */
223 deh[0].deh_dir_id = dirid; 244 deh[0].deh_dir_id = dirid;
224 deh[0].deh_objectid = objid; 245 deh[0].deh_objectid = objid;
225 deh[0].deh_state = 0; /* Endian safe if 0 */ 246 deh[0].deh_state = 0; /* Endian safe if 0 */
226 put_deh_location( &(deh[0]), EMPTY_DIR_SIZE_V1 - strlen( "." )); 247 put_deh_location(&(deh[0]), EMPTY_DIR_SIZE_V1 - strlen("."));
227 mark_de_visible(&(deh[0])); 248 mark_de_visible(&(deh[0]));
228 249
229 /* direntry header of ".." */ 250 /* direntry header of ".." */
230 put_deh_offset( &(deh[1]), DOT_DOT_OFFSET); 251 put_deh_offset(&(deh[1]), DOT_DOT_OFFSET);
231 /* key of ".." for the root directory */ 252 /* key of ".." for the root directory */
232 /* these two are from the inode, and are are LE */ 253 /* these two are from the inode, and are are LE */
233 deh[1].deh_dir_id = par_dirid; 254 deh[1].deh_dir_id = par_dirid;
234 deh[1].deh_objectid = par_objid; 255 deh[1].deh_objectid = par_objid;
235 deh[1].deh_state = 0; /* Endian safe if 0 */ 256 deh[1].deh_state = 0; /* Endian safe if 0 */
236 put_deh_location( &(deh[1]), deh_location( &(deh[0]) ) - strlen( ".." ) ); 257 put_deh_location(&(deh[1]), deh_location(&(deh[0])) - strlen(".."));
237 mark_de_visible(&(deh[1])); 258 mark_de_visible(&(deh[1]));
238 259
239 /* copy ".." and "." */ 260 /* copy ".." and "." */
240 memcpy (body + deh_location( &(deh[0]) ), ".", 1); 261 memcpy(body + deh_location(&(deh[0])), ".", 1);
241 memcpy (body + deh_location( &(deh[1]) ), "..", 2); 262 memcpy(body + deh_location(&(deh[1])), "..", 2);
242} 263}
243 264
244/* compose directory item containing "." and ".." entries */ 265/* compose directory item containing "." and ".." entries */
245void make_empty_dir_item (char * body, __le32 dirid, __le32 objid, 266void make_empty_dir_item(char *body, __le32 dirid, __le32 objid,
246 __le32 par_dirid, __le32 par_objid) 267 __le32 par_dirid, __le32 par_objid)
247{ 268{
248 struct reiserfs_de_head * deh; 269 struct reiserfs_de_head *deh;
249 270
250 memset (body, 0, EMPTY_DIR_SIZE); 271 memset(body, 0, EMPTY_DIR_SIZE);
251 deh = (struct reiserfs_de_head *)body; 272 deh = (struct reiserfs_de_head *)body;
252 273
253 /* direntry header of "." */ 274 /* direntry header of "." */
254 put_deh_offset( &(deh[0]), DOT_OFFSET ); 275 put_deh_offset(&(deh[0]), DOT_OFFSET);
255 /* these two are from make_le_item_head, and are are LE */ 276 /* these two are from make_le_item_head, and are are LE */
256 deh[0].deh_dir_id = dirid; 277 deh[0].deh_dir_id = dirid;
257 deh[0].deh_objectid = objid; 278 deh[0].deh_objectid = objid;
258 deh[0].deh_state = 0; /* Endian safe if 0 */ 279 deh[0].deh_state = 0; /* Endian safe if 0 */
259 put_deh_location( &(deh[0]), EMPTY_DIR_SIZE - ROUND_UP( strlen( "." ) ) ); 280 put_deh_location(&(deh[0]), EMPTY_DIR_SIZE - ROUND_UP(strlen(".")));
260 mark_de_visible(&(deh[0])); 281 mark_de_visible(&(deh[0]));
261 282
262 /* direntry header of ".." */ 283 /* direntry header of ".." */
263 put_deh_offset( &(deh[1]), DOT_DOT_OFFSET ); 284 put_deh_offset(&(deh[1]), DOT_DOT_OFFSET);
264 /* key of ".." for the root directory */ 285 /* key of ".." for the root directory */
265 /* these two are from the inode, and are are LE */ 286 /* these two are from the inode, and are are LE */
266 deh[1].deh_dir_id = par_dirid; 287 deh[1].deh_dir_id = par_dirid;
267 deh[1].deh_objectid = par_objid; 288 deh[1].deh_objectid = par_objid;
268 deh[1].deh_state = 0; /* Endian safe if 0 */ 289 deh[1].deh_state = 0; /* Endian safe if 0 */
269 put_deh_location( &(deh[1]), deh_location( &(deh[0])) - ROUND_UP( strlen( ".." ) ) ); 290 put_deh_location(&(deh[1]),
270 mark_de_visible(&(deh[1])); 291 deh_location(&(deh[0])) - ROUND_UP(strlen("..")));
271 292 mark_de_visible(&(deh[1]));
272 /* copy ".." and "." */ 293
273 memcpy (body + deh_location( &(deh[0]) ), ".", 1); 294 /* copy ".." and "." */
274 memcpy (body + deh_location( &(deh[1]) ), "..", 2); 295 memcpy(body + deh_location(&(deh[0])), ".", 1);
296 memcpy(body + deh_location(&(deh[1])), "..", 2);
275} 297}
generated by cgit v1.2.2 (git 2.25.0) at 2024-10-22 04:57:15 -0400