| Start/ | End/ | |||
| True | False | - | Line | Source |
| 1 | /* | |||
| 2 | * linux/fs/ext3/dir.c | |||
| 3 | * | |||
| 4 | * Copyright (C) 1992, 1993, 1994, 1995 | |||
| 5 | * Remy Card (card@masi.ibp.fr) | |||
| 6 | * Laboratoire MASI - Institut Blaise Pascal | |||
| 7 | * Universite Pierre et Marie Curie (Paris VI) | |||
| 8 | * | |||
| 9 | * from | |||
| 10 | * | |||
| 11 | * linux/fs/minix/dir.c | |||
| 12 | * | |||
| 13 | * Copyright (C) 1991, 1992 Linus Torvalds | |||
| 14 | * | |||
| 15 | * ext3 directory handling functions | |||
| 16 | * | |||
| 17 | * Big-endian to little-endian byte-swapping/bitmaps by | |||
| 18 | * David S. Miller (davem@caip.rutgers.edu), 1995 | |||
| 19 | * | |||
| 20 | * Hash Tree Directory indexing (c) 2001 Daniel Phillips | |||
| 21 | * | |||
| 22 | */ | |||
| 23 | ||||
| 24 | #include <linux/fs.h> | |||
| 25 | #include <linux/jbd.h> | |||
| 26 | #include <linux/ext3_fs.h> | |||
| 27 | #include <linux/buffer_head.h> | |||
| 28 | #include <linux/smp_lock.h> | |||
| 29 | #include <linux/slab.h> | |||
| 30 | #include <linux/rbtree.h> | |||
| 31 | ||||
| 32 | static unsigned char ext3_filetype_table[] = { | |||
| 33 | DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK | |||
| 34 | }; | |||
| 35 | ||||
| 36 | static int ext3_readdir(struct file *, void *, filldir_t); | |||
| 37 | static int ext3_dx_readdir(struct file * filp, | |||
| 38 | void * dirent, filldir_t filldir); | |||
| 39 | static int ext3_release_dir (struct inode * inode, | |||
| 40 | struct file * filp); | |||
| 41 | ||||
| 42 | struct file_operations ext3_dir_operations = { | |||
| 43 | .llseek = generic_file_llseek, | |||
| 44 | .read = generic_read_dir, | |||
| 45 | .readdir = ext3_readdir, /* we take BKL. needed?*/ | |||
| 46 | .ioctl = ext3_ioctl, /* BKL held */ | |||
| 47 | .fsync = ext3_sync_file, /* BKL held */ | |||
| 48 | #ifdef CONFIG_EXT3_INDEX | |||
| 49 | .release = ext3_release_dir, | |||
| 50 | #endif | |||
| 51 | }; | |||
| 52 | ||||
| 53 | ||||
| 5915E3 | 0 | 54 | static unsigned char get_dtype(struct super_block *sb, int filetype) | |
| 55 | { | |||
| 56 | if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_FILETYPE) || | |||
| 0 | 5915E3 | - | 57 | (filetype >= EXT3_FT_MAX)) |
| 0 | - | 57 | !(T) || (T) | |
| 0 | - | 57 | !(F) || (_) | |
| 5915E3 | 57 | !(T) || (F) | ||
| 0 | - | 58 | return DT_UNKNOWN; | |
| 59 | ||||
| 5915E3 | 60 | return (ext3_filetype_table[filetype]); | ||
| 61 | } | |||
| 62 | ||||
| 63 | ||||
| 3604E4 | 0 | 64 | int ext3_check_dir_entry (const char * function, struct inode * dir, | |
| 65 | struct ext3_dir_entry_2 * de, | |||
| 66 | struct buffer_head * bh, | |||
| 67 | unsigned long offset) | |||
| 68 | { | |||
| 69 | const char * error_msg = NULL; | |||
| 70 | const int rlen = le16_to_cpu(de->rec_len); | |||
| 71 | ||||
| 0 | 3604E4 | - | 72 | if (rlen < EXT3_DIR_REC_LEN(1)) |
| 73 | error_msg = "rec_len is smaller than minimal"; | |||
| 0 | 3604E4 | - | 74 | else if (rlen % 4 != 0) |
| 75 | error_msg = "rec_len % 4 != 0"; | |||
| 0 | 3604E4 | - | 76 | else if (rlen < EXT3_DIR_REC_LEN(de->name_len)) |
| 77 | error_msg = "rec_len is too small for name_len"; | |||
| 0 | 3604E4 | - | 78 | else if (((char *) de - bh->b_data) + rlen > dir->i_sb->s_blocksize) |
| 79 | error_msg = "directory entry across blocks"; | |||
| 80 | else if (le32_to_cpu(de->inode) > | |||
| 0 | 3604E4 | - | 81 | le32_to_cpu(EXT3_SB(dir->i_sb)->s_es->s_inodes_count)) |
| 82 | error_msg = "inode out of bounds"; | |||
| 83 | ||||
| 0 | 3604E4 | - | 84 | if (error_msg != NULL) |
| 85 | ext3_error (dir->i_sb, function, | |||
| 86 | "bad entry in directory #%lu: %s - " | |||
| 87 | "offset=%lu, inode=%lu, rec_len=%d, name_len=%d", | |||
| 88 | dir->i_ino, error_msg, offset, | |||
| 89 | (unsigned long) le32_to_cpu(de->inode), | |||
| 90 | rlen, de->name_len); | |||
| 91 | return error_msg == NULL ? 1 : 0; | |||
| 3604E4 | 0 | - | 91 | ternary-?: error_msg == ( ( void * ) 0 ) |
| 3604E4 | 91 | return error_msg == ( ( void * ) 0 ) ? 1 : 0 | ||
| 92 | } | |||
| 93 | ||||
| 650194 | 0 | 94 | static int ext3_readdir(struct file * filp, | |
| 95 | void * dirent, filldir_t filldir) | |||
| 96 | { | |||
| 97 | int error = 0; | |||
| 98 | unsigned long offset, blk; | |||
| 99 | int i, num, stored; | |||
| 100 | struct buffer_head * bh, * tmp, * bha[16]; | |||
| 101 | struct ext3_dir_entry_2 * de; | |||
| 102 | struct super_block * sb; | |||
| 103 | int err; | |||
| 104 | struct inode *inode = filp->f_dentry->d_inode; | |||
| 105 | int ret = 0; | |||
| 106 | ||||
| 107 | sb = inode->i_sb; | |||
| 108 | ||||
| 109 | #ifdef CONFIG_EXT3_INDEX | |||
| 110 | if (EXT3_HAS_COMPAT_FEATURE(inode->i_sb, | |||
| 111 | EXT3_FEATURE_COMPAT_DIR_INDEX) && | |||
| 112 | ((EXT3_I(inode)->i_flags & EXT3_INDEX_FL) || | |||
| 0 | 650194 | - | 113 | ((inode->i_size >> sb->s_blocksize_bits) == 1))) { |
| 0 | - | 113 | (T) && ((T) || (_)) | |
| 0 | - | 113 | (T) && ((F) || (T)) | |
| 0 | - | 113 | (T) && ((F) || (F)) | |
| 650194 | 113 | (F) && ((_) || (_)) | ||
| 114 | err = ext3_dx_readdir(filp, dirent, filldir); | |||
| 0 | 0 | - | 115 | if (err != ERR_BAD_DX_DIR) { |
| 116 | ret = err; | |||
| 0 | - | 117 | goto out; | |
| 118 | } | |||
| 119 | /* | |||
| 120 | * We don't set the inode dirty flag since it's not | |||
| 121 | * critical that it get flushed back to the disk. | |||
| 122 | */ | |||
| 123 | EXT3_I(filp->f_dentry->d_inode)->i_flags &= ~EXT3_INDEX_FL; | |||
| 124 | } | |||
| 125 | #endif | |||
| 126 | stored = 0; | |||
| 127 | bh = NULL; | |||
| 128 | offset = filp->f_pos & (sb->s_blocksize - 1); | |||
| 129 | ||||
| 363410 | 650194 | 130 | while (!error && !stored && filp->f_pos < inode->i_size) { | |
| 363410 | 130 | T && T && T | ||
| 303788 | 130 | T && T && F | ||
| 327950 | 130 | T && F && _ | ||
| 18456 | 130 | F && _ && _ | ||
| 131 | blk = (filp->f_pos) >> EXT3_BLOCK_SIZE_BITS(sb); | |||
| 132 | bh = ext3_bread(NULL, inode, blk, 0, &err); | |||
| 0 | 363410 | - | 133 | if (!bh) { |
| 134 | ext3_error (sb, "ext3_readdir", | |||
| 135 | "directory #%lu contains a hole at offset %lu", | |||
| 136 | inode->i_ino, (unsigned long)filp->f_pos); | |||
| 137 | filp->f_pos += sb->s_blocksize - offset; | |||
| 0 | - | 138 | continue; | |
| 139 | } | |||
| 140 | ||||
| 141 | /* | |||
| 142 | * Do the readahead | |||
| 143 | */ | |||
| 345093 | 18317 | 144 | if (!offset) { | |
| 145 | for (i = 16 >> (EXT3_BLOCK_SIZE_BITS(sb) - 9), num = 0; | |||
| 690186 | 345093 | 146 | i > 0; i--) { | |
| 147 | tmp = ext3_getblk (NULL, inode, ++blk, 0, &err); | |||
| 148 | if (tmp && !buffer_uptodate(tmp) && | |||
| 3862 | 686324 | 149 | !buffer_locked(tmp)) | |
| 3862 | 149 | T && T && T | ||
| 536 | 149 | T && T && F | ||
| 59030 | 149 | T && F && _ | ||
| 626758 | 149 | F && _ && _ | ||
| 150 | bha[num++] = tmp; | |||
| 151 | else | |||
| 152 | brelse (tmp); | |||
| 153 | } | |||
| 3017 | 342076 | 154 | if (num) { | |
| 155 | ll_rw_block (READA, num, bha); | |||
| 3862 | 3017 | 156 | for (i = 0; i < num; i++) | |
| 157 | brelse (bha[i]); | |||
| 158 | } | |||
| 159 | } | |||
| 160 | ||||
| 161 | revalidate: | |||
| 162 | /* If the dir block has changed since the last call to | |||
| 163 | * readdir(2), then we might be pointing to an invalid | |||
| 164 | * dirent right now. Scan from the start of the block | |||
| 165 | * to make sure. */ | |||
| 311709 | 51701 | 166 | if (filp->f_version != inode->i_version) { | |
| 122 | 311709 | 167 | for (i = 0; i < sb->s_blocksize && i < offset; ) { | |
| 122 | 167 | T && T | ||
| 311709 | 167 | T && F | ||
| 0 | - | 167 | F && _ | |
| 168 | de = (struct ext3_dir_entry_2 *) | |||
| 169 | (bh->b_data + i); | |||
| 170 | /* It's too expensive to do a full | |||
| 171 | * dirent test each time round this | |||
| 172 | * loop, but we do have to test at | |||
| 173 | * least that it is non-zero. A | |||
| 174 | * failure will be detected in the | |||
| 175 | * dirent test below. */ | |||
| 176 | if (le16_to_cpu(de->rec_len) < | |||
| 0 | 122 | - | 177 | EXT3_DIR_REC_LEN(1)) |
| 0 | - | 178 | break; | |
| 179 | i += le16_to_cpu(de->rec_len); | |||
| 180 | } | |||
| 181 | offset = i; | |||
| 182 | filp->f_pos = (filp->f_pos & ~(sb->s_blocksize - 1)) | |||
| 183 | | offset; | |||
| 184 | filp->f_version = inode->i_version; | |||
| 185 | } | |||
| 186 | ||||
| 187 | while (!error && filp->f_pos < inode->i_size | |||
| 5933E3 | 344954 | 188 | && offset < sb->s_blocksize) { | |
| 5933E3 | 188 | T && T && T | ||
| 33533 | 188 | T && T && F | ||
| 311421 | 188 | T && F && _ | ||
| 0 | - | 188 | F && _ && _ | |
| 189 | de = (struct ext3_dir_entry_2 *) (bh->b_data + offset); | |||
| 190 | if (!ext3_check_dir_entry ("ext3_readdir", inode, de, | |||
| 0 | 5933E3 | - | 191 | bh, offset)) { |
| 192 | /* On error, skip the f_pos to the | |||
| 193 | next block. */ | |||
| 194 | filp->f_pos = (filp->f_pos | | |||
| 195 | (sb->s_blocksize - 1)) + 1; | |||
| 196 | brelse (bh); | |||
| 197 | ret = stored; | |||
| 0 | - | 198 | goto out; | |
| 199 | } | |||
| 200 | offset += le16_to_cpu(de->rec_len); | |||
| 5915E3 | 17521 | 201 | if (le32_to_cpu(de->inode)) { | |
| 202 | /* We might block in the next section | |||
| 203 | * if the data destination is | |||
| 204 | * currently swapped out. So, use a | |||
| 205 | * version stamp to detect whether or | |||
| 206 | * not the directory has been modified | |||
| 207 | * during the copy operation. | |||
| 208 | */ | |||
| 209 | unsigned long version = filp->f_version; | |||
| 210 | ||||
| 211 | error = filldir(dirent, de->name, | |||
| 212 | de->name_len, | |||
| 213 | filp->f_pos, | |||
| 214 | le32_to_cpu(de->inode), | |||
| 215 | get_dtype(sb, de->file_type)); | |||
| 18456 | 5897E3 | 216 | if (error) | |
| 18456 | 217 | break; | ||
| 0 | 5897E3 | - | 218 | if (version != filp->f_version) |
| 0 | - | 219 | goto revalidate; | |
| 220 | stored ++; | |||
| 221 | } | |||
| 222 | filp->f_pos += le16_to_cpu(de->rec_len); | |||
| 223 | } | |||
| 224 | offset = 0; | |||
| 225 | brelse (bh); | |||
| 226 | } | |||
| 227 | out: | |||
| 650194 | 228 | return ret; | ||
| 229 | } | |||
| 230 | ||||
| 231 | #ifdef CONFIG_EXT3_INDEX | |||
| 232 | /* | |||
| 233 | * These functions convert from the major/minor hash to an f_pos | |||
| 234 | * value. | |||
| 235 | * | |||
| 236 | * Currently we only use major hash numer. This is unfortunate, but | |||
| 237 | * on 32-bit machines, the same VFS interface is used for lseek and | |||
| 238 | * llseek, so if we use the 64 bit offset, then the 32-bit versions of | |||
| 239 | * lseek/telldir/seekdir will blow out spectacularly, and from within | |||
| 240 | * the ext2 low-level routine, we don't know if we're being called by | |||
| 241 | * a 64-bit version of the system call or the 32-bit version of the | |||
| 242 | * system call. Worse yet, NFSv2 only allows for a 32-bit readdir | |||
| 243 | * cookie. Sigh. | |||
| 244 | */ | |||
| 245 | #define hash2pos(major, minor) (major >> 1) | |||
| 246 | #define pos2maj_hash(pos) ((pos << 1) & 0xffffffff) | |||
| 247 | #define pos2min_hash(pos) (0) | |||
| 248 | ||||
| 249 | /* | |||
| 250 | * This structure holds the nodes of the red-black tree used to store | |||
| 251 | * the directory entry in hash order. | |||
| 252 | */ | |||
| 253 | struct fname { | |||
| 254 | __u32 hash; | |||
| 255 | __u32 minor_hash; | |||
| 256 | struct rb_node rb_hash; | |||
| 257 | struct fname *next; | |||
| 258 | __u32 inode; | |||
| 259 | __u8 name_len; | |||
| 260 | __u8 file_type; | |||
| 261 | char name[0]; | |||
| 262 | }; | |||
| 263 | ||||
| 264 | /* | |||
| 265 | * This functoin implements a non-recursive way of freeing all of the | |||
| 266 | * nodes in the red-black tree. | |||
| 267 | */ | |||
| 0 | 0 | - | 268 | static void free_rb_tree_fname(struct rb_root *root) |
| 269 | { | |||
| 270 | struct rb_node *n = root->rb_node; | |||
| 271 | struct rb_node *parent; | |||
| 272 | struct fname *fname; | |||
| 273 | ||||
| 0 | 0 | - | 274 | while (n) { |
| 275 | /* Do the node's children first */ | |||
| 0 | 0 | - | 276 | if ((n)->rb_left) { |
| 277 | n = n->rb_left; | |||
| 0 | - | 278 | continue; | |
| 279 | } | |||
| 0 | 0 | - | 280 | if (n->rb_right) { |
| 281 | n = n->rb_right; | |||
| 0 | - | 282 | continue; | |
| 283 | } | |||
| 284 | /* | |||
| 285 | * The node has no children; free it, and then zero | |||
| 286 | * out parent's link to it. Finally go to the | |||
| 287 | * beginning of the loop and try to free the parent | |||
| 288 | * node. | |||
| 289 | */ | |||
| 290 | parent = n->rb_parent; | |||
| 291 | fname = rb_entry(n, struct fname, rb_hash); | |||
| 0 | 0 | - | 292 | while (fname) { |
| 293 | struct fname * old = fname; | |||
| 294 | fname = fname->next; | |||
| 295 | kfree (old); | |||
| 296 | } | |||
| 0 | 0 | - | 297 | if (!parent) |
| 298 | root->rb_node = NULL; | |||
| 0 | 0 | - | 299 | else if (parent->rb_left == n) |
| 300 | parent->rb_left = NULL; | |||
| 0 | 0 | - | 301 | else if (parent->rb_right == n) |
| 302 | parent->rb_right = NULL; | |||
| 303 | n = parent; | |||
| 304 | } | |||
| 305 | root->rb_node = NULL; | |||
| 306 | } | |||
| 307 | ||||
| 308 | ||||
| 0 | 0 | - | 309 | static struct dir_private_info *create_dir_info(loff_t pos) |
| 310 | { | |||
| 311 | struct dir_private_info *p; | |||
| 312 | ||||
| 313 | p = kmalloc(sizeof(struct dir_private_info), GFP_KERNEL); | |||
| 0 | 0 | - | 314 | if (!p) |
| 0 | - | 315 | return NULL; | |
| 316 | p->root.rb_node = NULL; | |||
| 317 | p->curr_node = NULL; | |||
| 318 | p->extra_fname = NULL; | |||
| 319 | p->last_pos = 0; | |||
| 320 | p->curr_hash = pos2maj_hash(pos); | |||
| 321 | p->curr_minor_hash = pos2min_hash(pos); | |||
| 322 | p->next_hash = 0; | |||
| 0 | - | 323 | return p; | |
| 324 | } | |||
| 325 | ||||
| 0 | 0 | - | 326 | void ext3_htree_free_dir_info(struct dir_private_info *p) |
| 327 | { | |||
| 328 | free_rb_tree_fname(&p->root); | |||
| 329 | kfree(p); | |||
| 330 | } | |||
| 331 | ||||
| 332 | /* | |||
| 333 | * Given a directory entry, enter it into the fname rb tree. | |||
| 334 | */ | |||
| 0 | 0 | - | 335 | int ext3_htree_store_dirent(struct file *dir_file, __u32 hash, |
| 336 | __u32 minor_hash, | |||
| 337 | struct ext3_dir_entry_2 *dirent) | |||
| 338 | { | |||
| 339 | struct rb_node **p, *parent = NULL; | |||
| 340 | struct fname * fname, *new_fn; | |||
| 341 | struct dir_private_info *info; | |||
| 342 | int len; | |||
| 343 | ||||
| 344 | info = (struct dir_private_info *) dir_file->private_data; | |||
| 345 | p = &info->root.rb_node; | |||
| 346 | ||||
| 347 | /* Create and allocate the fname structure */ | |||
| 348 | len = sizeof(struct fname) + dirent->name_len + 1; | |||
| 349 | new_fn = kmalloc(len, GFP_KERNEL); | |||
| 0 | 0 | - | 350 | if (!new_fn) |
| 0 | - | 351 | return -ENOMEM; | |
| 352 | memset(new_fn, 0, len); | |||
| 353 | new_fn->hash = hash; | |||
| 354 | new_fn->minor_hash = minor_hash; | |||
| 355 | new_fn->inode = le32_to_cpu(dirent->inode); | |||
| 356 | new_fn->name_len = dirent->name_len; | |||
| 357 | new_fn->file_type = dirent->file_type; | |||
| 358 | memcpy(new_fn->name, dirent->name, dirent->name_len); | |||
| 359 | new_fn->name[dirent->name_len] = 0; | |||
| 360 | ||||
| 0 | 0 | - | 361 | while (*p) { |
| 362 | parent = *p; | |||
| 363 | fname = rb_entry(parent, struct fname, rb_hash); | |||
| 364 | ||||
| 365 | /* | |||
| 366 | * If the hash and minor hash match up, then we put | |||
| 367 | * them on a linked list. This rarely happens... | |||
| 368 | */ | |||
| 369 | if ((new_fn->hash == fname->hash) && | |||
| 0 | 0 | - | 370 | (new_fn->minor_hash == fname->minor_hash)) { |
| 0 | - | 370 | (T) && (T) | |
| 0 | - | 370 | (T) && (F) | |
| 0 | - | 370 | (F) && (_) | |
| 371 | new_fn->next = fname->next; | |||
| 372 | fname->next = new_fn; | |||
| 0 | - | 373 | return 0; | |
| 374 | } | |||
| 375 | ||||
| 0 | 0 | - | 376 | if (new_fn->hash < fname->hash) |
| 377 | p = &(*p)->rb_left; | |||
| 0 | 0 | - | 378 | else if (new_fn->hash > fname->hash) |
| 379 | p = &(*p)->rb_right; | |||
| 0 | 0 | - | 380 | else if (new_fn->minor_hash < fname->minor_hash) |
| 381 | p = &(*p)->rb_left; | |||
| 382 | else /* if (new_fn->minor_hash > fname->minor_hash) */ | |||
| 383 | p = &(*p)->rb_right; | |||
| 384 | } | |||
| 385 | ||||
| 386 | rb_link_node(&new_fn->rb_hash, parent, p); | |||
| 387 | rb_insert_color(&new_fn->rb_hash, &info->root); | |||
| 0 | - | 388 | return 0; | |
| 389 | } | |||
| 390 | ||||
| 391 | ||||
| 392 | ||||
| 393 | /* | |||
| 394 | * This is a helper function for ext3_dx_readdir. It calls filldir | |||
| 395 | * for all entres on the fname linked list. (Normally there is only | |||
| 396 | * one entry on the linked list, unless there are 62 bit hash collisions.) | |||
| 397 | */ | |||
| 0 | 0 | - | 398 | static int call_filldir(struct file * filp, void * dirent, |
| 399 | filldir_t filldir, struct fname *fname) | |||
| 400 | { | |||
| 401 | struct dir_private_info *info = filp->private_data; | |||
| 402 | loff_t curr_pos; | |||
| 403 | struct inode *inode = filp->f_dentry->d_inode; | |||
| 404 | struct super_block * sb; | |||
| 405 | int error; | |||
| 406 | ||||
| 407 | sb = inode->i_sb; | |||
| 408 | ||||
| 0 | 0 | - | 409 | if (!fname) { |
| 410 | printk("call_filldir: called with null fname?!?\n"); | |||
| 0 | - | 411 | return 0; | |
| 412 | } | |||
| 413 | curr_pos = hash2pos(fname->hash, fname->minor_hash); | |||
| 0 | 0 | - | 414 | while (fname) { |
| 415 | error = filldir(dirent, fname->name, | |||
| 416 | fname->name_len, curr_pos, | |||
| 417 | fname->inode, | |||
| 418 | get_dtype(sb, fname->file_type)); | |||
| 0 | 0 | - | 419 | if (error) { |
| 420 | filp->f_pos = curr_pos; | |||
| 421 | info->extra_fname = fname->next; | |||
| 0 | - | 422 | return error; | |
| 423 | } | |||
| 424 | fname = fname->next; | |||
| 425 | } | |||
| 0 | - | 426 | return 0; | |
| 427 | } | |||
| 428 | ||||
| 0 | 0 | - | 429 | static int ext3_dx_readdir(struct file * filp, |
| 430 | void * dirent, filldir_t filldir) | |||
| 431 | { | |||
| 432 | struct dir_private_info *info = filp->private_data; | |||
| 433 | struct inode *inode = filp->f_dentry->d_inode; | |||
| 434 | struct fname *fname; | |||
| 435 | int ret; | |||
| 436 | ||||
| 0 | 0 | - | 437 | if (!info) { |
| 438 | info = create_dir_info(filp->f_pos); | |||
| 0 | 0 | - | 439 | if (!info) |
| 0 | - | 440 | return -ENOMEM; | |
| 441 | filp->private_data = info; | |||
| 442 | } | |||
| 443 | ||||
| 0 | 0 | - | 444 | if (filp->f_pos == EXT3_HTREE_EOF) |
| 0 | - | 445 | return 0; /* EOF */ | |
| 446 | ||||
| 447 | /* Some one has messed with f_pos; reset the world */ | |||
| 0 | 0 | - | 448 | if (info->last_pos != filp->f_pos) { |
| 449 | free_rb_tree_fname(&info->root); | |||
| 450 | info->curr_node = NULL; | |||
| 451 | info->extra_fname = NULL; | |||
| 452 | info->curr_hash = pos2maj_hash(filp->f_pos); | |||
| 453 | info->curr_minor_hash = pos2min_hash(filp->f_pos); | |||
| 454 | } | |||
| 455 | ||||
| 456 | /* | |||
| 457 | * If there are any leftover names on the hash collision | |||
| 458 | * chain, return them first. | |||
| 459 | */ | |||
| 460 | if (info->extra_fname && | |||
| 0 | 0 | - | 461 | call_filldir(filp, dirent, filldir, info->extra_fname)) |
| 0 | - | 461 | T && T | |
| 0 | - | 461 | T && F | |
| 0 | - | 461 | F && _ | |
| 0 | - | 462 | goto finished; | |
| 463 | ||||
| 0 | 0 | - | 464 | if (!info->curr_node) |
| 465 | info->curr_node = rb_first(&info->root); | |||
| 466 | ||||
| 0 | 0 | - | 467 | while (1) { |
| 468 | /* | |||
| 469 | * Fill the rbtree if we have no more entries, | |||
| 470 | * or the inode has changed since we last read in the | |||
| 471 | * cached entries. | |||
| 472 | */ | |||
| 473 | if ((!info->curr_node) || | |||
| 0 | 0 | - | 474 | (filp->f_version != inode->i_version)) { |
| 0 | - | 474 | (T) || (_) | |
| 0 | - | 474 | (F) || (T) | |
| 0 | - | 474 | (F) || (F) | |
| 475 | info->curr_node = NULL; | |||
| 476 | free_rb_tree_fname(&info->root); | |||
| 477 | filp->f_version = inode->i_version; | |||
| 478 | ret = ext3_htree_fill_tree(filp, info->curr_hash, | |||
| 479 | info->curr_minor_hash, | |||
| 480 | &info->next_hash); | |||
| 0 | 0 | - | 481 | if (ret < 0) |
| 0 | - | 482 | return ret; | |
| 0 | 0 | - | 483 | if (ret == 0) { |
| 484 | ||||