Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/fs/vfat/namei.c |
| 3 | * |
| 4 | * Written 1992,1993 by Werner Almesberger |
| 5 | * |
| 6 | * Windows95/Windows NT compatible extended MSDOS filesystem |
| 7 | * by Gordon Chaffee Copyright (C) 1995. Send bug reports for the |
| 8 | * VFAT filesystem to <chaffee@cs.berkeley.edu>. Specify |
| 9 | * what file operation caused you trouble and if you can duplicate |
| 10 | * the problem, send a script that demonstrates it. |
| 11 | * |
| 12 | * Short name translation 1999, 2001 by Wolfram Pienkoss <wp@bszh.de> |
| 13 | * |
| 14 | * Support Multibyte characters and cleanup by |
| 15 | * OGAWA Hirofumi <hirofumi@mail.parknet.co.jp> |
| 16 | */ |
| 17 | |
| 18 | #include <linux/module.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 19 | #include <linux/ctype.h> |
| 20 | #include <linux/slab.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 21 | #include <linux/namei.h> |
OGAWA Hirofumi | 9e975da | 2008-11-06 12:53:46 -0800 | [diff] [blame] | 22 | #include "fat.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 23 | |
OGAWA Hirofumi | 1b52467 | 2008-11-06 12:53:51 -0800 | [diff] [blame] | 24 | /* |
| 25 | * If new entry was created in the parent, it could create the 8.3 |
| 26 | * alias (the shortname of logname). So, the parent may have the |
| 27 | * negative-dentry which matches the created 8.3 alias. |
| 28 | * |
| 29 | * If it happened, the negative dentry isn't actually negative |
| 30 | * anymore. So, drop it. |
| 31 | */ |
| 32 | static int vfat_revalidate_shortname(struct dentry *dentry) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 33 | { |
| 34 | int ret = 1; |
OGAWA Hirofumi | 1b52467 | 2008-11-06 12:53:51 -0800 | [diff] [blame] | 35 | spin_lock(&dentry->d_lock); |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 36 | if (dentry->d_time != d_inode(dentry->d_parent)->i_version) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 37 | ret = 0; |
OGAWA Hirofumi | 1b52467 | 2008-11-06 12:53:51 -0800 | [diff] [blame] | 38 | spin_unlock(&dentry->d_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 39 | return ret; |
| 40 | } |
| 41 | |
Al Viro | 0b728e1 | 2012-06-10 16:03:43 -0400 | [diff] [blame] | 42 | static int vfat_revalidate(struct dentry *dentry, unsigned int flags) |
OGAWA Hirofumi | 1b52467 | 2008-11-06 12:53:51 -0800 | [diff] [blame] | 43 | { |
Al Viro | 0b728e1 | 2012-06-10 16:03:43 -0400 | [diff] [blame] | 44 | if (flags & LOOKUP_RCU) |
Nick Piggin | 34286d6 | 2011-01-07 17:49:57 +1100 | [diff] [blame] | 45 | return -ECHILD; |
| 46 | |
OGAWA Hirofumi | 1b52467 | 2008-11-06 12:53:51 -0800 | [diff] [blame] | 47 | /* This is not negative dentry. Always valid. */ |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 48 | if (d_really_is_positive(dentry)) |
OGAWA Hirofumi | 1b52467 | 2008-11-06 12:53:51 -0800 | [diff] [blame] | 49 | return 1; |
| 50 | return vfat_revalidate_shortname(dentry); |
| 51 | } |
| 52 | |
Al Viro | 0b728e1 | 2012-06-10 16:03:43 -0400 | [diff] [blame] | 53 | static int vfat_revalidate_ci(struct dentry *dentry, unsigned int flags) |
OGAWA Hirofumi | 1b52467 | 2008-11-06 12:53:51 -0800 | [diff] [blame] | 54 | { |
Al Viro | 0b728e1 | 2012-06-10 16:03:43 -0400 | [diff] [blame] | 55 | if (flags & LOOKUP_RCU) |
Nick Piggin | 34286d6 | 2011-01-07 17:49:57 +1100 | [diff] [blame] | 56 | return -ECHILD; |
| 57 | |
OGAWA Hirofumi | 1b52467 | 2008-11-06 12:53:51 -0800 | [diff] [blame] | 58 | /* |
| 59 | * This is not negative dentry. Always valid. |
| 60 | * |
| 61 | * Note, rename() to existing directory entry will have ->d_inode, |
| 62 | * and will use existing name which isn't specified name by user. |
| 63 | * |
| 64 | * We may be able to drop this positive dentry here. But dropping |
| 65 | * positive dentry isn't good idea. So it's unsupported like |
| 66 | * rename("filename", "FILENAME") for now. |
| 67 | */ |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 68 | if (d_really_is_positive(dentry)) |
OGAWA Hirofumi | 1b52467 | 2008-11-06 12:53:51 -0800 | [diff] [blame] | 69 | return 1; |
| 70 | |
| 71 | /* |
| 72 | * This may be nfsd (or something), anyway, we can't see the |
| 73 | * intent of this. So, since this can be for creation, drop it. |
| 74 | */ |
Al Viro | 0b728e1 | 2012-06-10 16:03:43 -0400 | [diff] [blame] | 75 | if (!flags) |
OGAWA Hirofumi | 1b52467 | 2008-11-06 12:53:51 -0800 | [diff] [blame] | 76 | return 0; |
| 77 | |
| 78 | /* |
| 79 | * Drop the negative dentry, in order to make sure to use the |
| 80 | * case sensitive name which is specified by user if this is |
| 81 | * for creation. |
| 82 | */ |
Al Viro | 0b728e1 | 2012-06-10 16:03:43 -0400 | [diff] [blame] | 83 | if (flags & (LOOKUP_CREATE | LOOKUP_RENAME_TARGET)) |
Al Viro | 407938e | 2011-06-25 21:37:18 -0400 | [diff] [blame] | 84 | return 0; |
OGAWA Hirofumi | 1b52467 | 2008-11-06 12:53:51 -0800 | [diff] [blame] | 85 | |
| 86 | return vfat_revalidate_shortname(dentry); |
| 87 | } |
| 88 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 89 | /* returns the length of a struct qstr, ignoring trailing dots */ |
Nick Piggin | 621e155 | 2011-01-07 17:49:27 +1100 | [diff] [blame] | 90 | static unsigned int __vfat_striptail_len(unsigned int len, const char *name) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 91 | { |
Nick Piggin | 621e155 | 2011-01-07 17:49:27 +1100 | [diff] [blame] | 92 | while (len && name[len - 1] == '.') |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 93 | len--; |
| 94 | return len; |
| 95 | } |
| 96 | |
Nick Piggin | 621e155 | 2011-01-07 17:49:27 +1100 | [diff] [blame] | 97 | static unsigned int vfat_striptail_len(const struct qstr *qstr) |
| 98 | { |
| 99 | return __vfat_striptail_len(qstr->len, qstr->name); |
| 100 | } |
| 101 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 102 | /* |
| 103 | * Compute the hash for the vfat name corresponding to the dentry. |
| 104 | * Note: if the name is invalid, we leave the hash code unchanged so |
| 105 | * that the existing dentry can be used. The vfat fs routines will |
| 106 | * return ENOENT or EINVAL as appropriate. |
| 107 | */ |
Linus Torvalds | da53be1 | 2013-05-21 15:22:44 -0700 | [diff] [blame] | 108 | static int vfat_hash(const struct dentry *dentry, struct qstr *qstr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 109 | { |
Linus Torvalds | 8387ff2 | 2016-06-10 07:51:30 -0700 | [diff] [blame] | 110 | qstr->hash = full_name_hash(dentry, qstr->name, vfat_striptail_len(qstr)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 111 | return 0; |
| 112 | } |
| 113 | |
| 114 | /* |
| 115 | * Compute the hash for the vfat name corresponding to the dentry. |
| 116 | * Note: if the name is invalid, we leave the hash code unchanged so |
| 117 | * that the existing dentry can be used. The vfat fs routines will |
| 118 | * return ENOENT or EINVAL as appropriate. |
| 119 | */ |
Linus Torvalds | da53be1 | 2013-05-21 15:22:44 -0700 | [diff] [blame] | 120 | static int vfat_hashi(const struct dentry *dentry, struct qstr *qstr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 121 | { |
Nick Piggin | b1e6a01 | 2011-01-07 17:49:28 +1100 | [diff] [blame] | 122 | struct nls_table *t = MSDOS_SB(dentry->d_sb)->nls_io; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 123 | const unsigned char *name; |
| 124 | unsigned int len; |
| 125 | unsigned long hash; |
| 126 | |
| 127 | name = qstr->name; |
| 128 | len = vfat_striptail_len(qstr); |
| 129 | |
Linus Torvalds | 8387ff2 | 2016-06-10 07:51:30 -0700 | [diff] [blame] | 130 | hash = init_name_hash(dentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 131 | while (len--) |
| 132 | hash = partial_name_hash(nls_tolower(t, *name++), hash); |
| 133 | qstr->hash = end_name_hash(hash); |
| 134 | |
| 135 | return 0; |
| 136 | } |
| 137 | |
| 138 | /* |
| 139 | * Case insensitive compare of two vfat names. |
| 140 | */ |
Linus Torvalds | da53be1 | 2013-05-21 15:22:44 -0700 | [diff] [blame] | 141 | static int vfat_cmpi(const struct dentry *parent, const struct dentry *dentry, |
Nick Piggin | 621e155 | 2011-01-07 17:49:27 +1100 | [diff] [blame] | 142 | unsigned int len, const char *str, const struct qstr *name) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 143 | { |
Nick Piggin | 621e155 | 2011-01-07 17:49:27 +1100 | [diff] [blame] | 144 | struct nls_table *t = MSDOS_SB(parent->d_sb)->nls_io; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 145 | unsigned int alen, blen; |
| 146 | |
| 147 | /* A filename cannot end in '.' or we treat it like it has none */ |
Nick Piggin | 621e155 | 2011-01-07 17:49:27 +1100 | [diff] [blame] | 148 | alen = vfat_striptail_len(name); |
| 149 | blen = __vfat_striptail_len(len, str); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 150 | if (alen == blen) { |
Nick Piggin | 621e155 | 2011-01-07 17:49:27 +1100 | [diff] [blame] | 151 | if (nls_strnicmp(t, name->name, str, alen) == 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 152 | return 0; |
| 153 | } |
| 154 | return 1; |
| 155 | } |
| 156 | |
| 157 | /* |
| 158 | * Case sensitive compare of two vfat names. |
| 159 | */ |
Linus Torvalds | da53be1 | 2013-05-21 15:22:44 -0700 | [diff] [blame] | 160 | static int vfat_cmp(const struct dentry *parent, const struct dentry *dentry, |
Nick Piggin | 621e155 | 2011-01-07 17:49:27 +1100 | [diff] [blame] | 161 | unsigned int len, const char *str, const struct qstr *name) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 162 | { |
| 163 | unsigned int alen, blen; |
| 164 | |
| 165 | /* A filename cannot end in '.' or we treat it like it has none */ |
Nick Piggin | 621e155 | 2011-01-07 17:49:27 +1100 | [diff] [blame] | 166 | alen = vfat_striptail_len(name); |
| 167 | blen = __vfat_striptail_len(len, str); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 168 | if (alen == blen) { |
Nick Piggin | 621e155 | 2011-01-07 17:49:27 +1100 | [diff] [blame] | 169 | if (strncmp(name->name, str, alen) == 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 170 | return 0; |
| 171 | } |
| 172 | return 1; |
| 173 | } |
| 174 | |
Al Viro | ce6cdc4 | 2009-02-20 05:59:46 +0000 | [diff] [blame] | 175 | static const struct dentry_operations vfat_ci_dentry_ops = { |
OGAWA Hirofumi | 1b52467 | 2008-11-06 12:53:51 -0800 | [diff] [blame] | 176 | .d_revalidate = vfat_revalidate_ci, |
| 177 | .d_hash = vfat_hashi, |
| 178 | .d_compare = vfat_cmpi, |
| 179 | }; |
| 180 | |
Al Viro | ce6cdc4 | 2009-02-20 05:59:46 +0000 | [diff] [blame] | 181 | static const struct dentry_operations vfat_dentry_ops = { |
OGAWA Hirofumi | 1b52467 | 2008-11-06 12:53:51 -0800 | [diff] [blame] | 182 | .d_revalidate = vfat_revalidate, |
| 183 | .d_hash = vfat_hash, |
| 184 | .d_compare = vfat_cmp, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 185 | }; |
| 186 | |
| 187 | /* Characters that are undesirable in an MS-DOS file name */ |
| 188 | |
| 189 | static inline wchar_t vfat_bad_char(wchar_t w) |
| 190 | { |
| 191 | return (w < 0x0020) |
| 192 | || (w == '*') || (w == '?') || (w == '<') || (w == '>') |
| 193 | || (w == '|') || (w == '"') || (w == ':') || (w == '/') |
| 194 | || (w == '\\'); |
| 195 | } |
| 196 | |
| 197 | static inline wchar_t vfat_replace_char(wchar_t w) |
| 198 | { |
| 199 | return (w == '[') || (w == ']') || (w == ';') || (w == ',') |
| 200 | || (w == '+') || (w == '='); |
| 201 | } |
| 202 | |
| 203 | static wchar_t vfat_skip_char(wchar_t w) |
| 204 | { |
| 205 | return (w == '.') || (w == ' '); |
| 206 | } |
| 207 | |
| 208 | static inline int vfat_is_used_badchars(const wchar_t *s, int len) |
| 209 | { |
| 210 | int i; |
| 211 | |
| 212 | for (i = 0; i < len; i++) |
| 213 | if (vfat_bad_char(s[i])) |
| 214 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 215 | |
Keith Mok | f22032b | 2008-04-28 02:16:29 -0700 | [diff] [blame] | 216 | if (s[i - 1] == ' ') /* last character cannot be space */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 217 | return -EINVAL; |
Keith Mok | f22032b | 2008-04-28 02:16:29 -0700 | [diff] [blame] | 218 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 219 | return 0; |
| 220 | } |
| 221 | |
| 222 | static int vfat_find_form(struct inode *dir, unsigned char *name) |
| 223 | { |
| 224 | struct fat_slot_info sinfo; |
| 225 | int err = fat_scan(dir, name, &sinfo); |
| 226 | if (err) |
| 227 | return -ENOENT; |
| 228 | brelse(sinfo.bh); |
| 229 | return 0; |
| 230 | } |
| 231 | |
| 232 | /* |
| 233 | * 1) Valid characters for the 8.3 format alias are any combination of |
| 234 | * letters, uppercase alphabets, digits, any of the |
| 235 | * following special characters: |
| 236 | * $ % ' ` - @ { } ~ ! # ( ) & _ ^ |
| 237 | * In this case Longfilename is not stored in disk. |
| 238 | * |
| 239 | * WinNT's Extension: |
| 240 | * File name and extension name is contain uppercase/lowercase |
| 241 | * only. And it is expressed by CASE_LOWER_BASE and CASE_LOWER_EXT. |
| 242 | * |
| 243 | * 2) File name is 8.3 format, but it contain the uppercase and |
| 244 | * lowercase char, muliti bytes char, etc. In this case numtail is not |
| 245 | * added, but Longfilename is stored. |
| 246 | * |
| 247 | * 3) When the one except for the above, or the following special |
| 248 | * character are contained: |
| 249 | * . [ ] ; , + = |
| 250 | * numtail is added, and Longfilename must be stored in disk . |
| 251 | */ |
| 252 | struct shortname_info { |
| 253 | unsigned char lower:1, |
| 254 | upper:1, |
| 255 | valid:1; |
| 256 | }; |
| 257 | #define INIT_SHORTNAME_INFO(x) do { \ |
| 258 | (x)->lower = 1; \ |
| 259 | (x)->upper = 1; \ |
| 260 | (x)->valid = 1; \ |
| 261 | } while (0) |
| 262 | |
| 263 | static inline int to_shortname_char(struct nls_table *nls, |
| 264 | unsigned char *buf, int buf_size, |
| 265 | wchar_t *src, struct shortname_info *info) |
| 266 | { |
| 267 | int len; |
| 268 | |
| 269 | if (vfat_skip_char(*src)) { |
| 270 | info->valid = 0; |
| 271 | return 0; |
| 272 | } |
| 273 | if (vfat_replace_char(*src)) { |
| 274 | info->valid = 0; |
| 275 | buf[0] = '_'; |
| 276 | return 1; |
| 277 | } |
| 278 | |
| 279 | len = nls->uni2char(*src, buf, buf_size); |
| 280 | if (len <= 0) { |
| 281 | info->valid = 0; |
| 282 | buf[0] = '_'; |
| 283 | len = 1; |
| 284 | } else if (len == 1) { |
| 285 | unsigned char prev = buf[0]; |
| 286 | |
| 287 | if (buf[0] >= 0x7F) { |
| 288 | info->lower = 0; |
| 289 | info->upper = 0; |
| 290 | } |
| 291 | |
| 292 | buf[0] = nls_toupper(nls, buf[0]); |
| 293 | if (isalpha(buf[0])) { |
| 294 | if (buf[0] == prev) |
| 295 | info->lower = 0; |
| 296 | else |
| 297 | info->upper = 0; |
| 298 | } |
| 299 | } else { |
| 300 | info->lower = 0; |
| 301 | info->upper = 0; |
| 302 | } |
| 303 | |
| 304 | return len; |
| 305 | } |
| 306 | |
| 307 | /* |
| 308 | * Given a valid longname, create a unique shortname. Make sure the |
| 309 | * shortname does not exist |
| 310 | * Returns negative number on error, 0 for a normal |
| 311 | * return, and 1 for valid shortname |
| 312 | */ |
| 313 | static int vfat_create_shortname(struct inode *dir, struct nls_table *nls, |
| 314 | wchar_t *uname, int ulen, |
| 315 | unsigned char *name_res, unsigned char *lcase) |
| 316 | { |
| 317 | struct fat_mount_options *opts = &MSDOS_SB(dir->i_sb)->options; |
| 318 | wchar_t *ip, *ext_start, *end, *name_start; |
Nikolaus Schulz | 30d1872 | 2010-04-01 02:21:10 +0900 | [diff] [blame] | 319 | unsigned char base[9], ext[4], buf[5], *p; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 320 | unsigned char charbuf[NLS_MAX_CHARSET_SIZE]; |
| 321 | int chl, chi; |
| 322 | int sz = 0, extlen, baselen, i, numtail_baselen, numtail2_baselen; |
| 323 | int is_shortname; |
| 324 | struct shortname_info base_info, ext_info; |
| 325 | |
| 326 | is_shortname = 1; |
| 327 | INIT_SHORTNAME_INFO(&base_info); |
| 328 | INIT_SHORTNAME_INFO(&ext_info); |
| 329 | |
| 330 | /* Now, we need to create a shortname from the long name */ |
| 331 | ext_start = end = &uname[ulen]; |
| 332 | while (--ext_start >= uname) { |
| 333 | if (*ext_start == 0x002E) { /* is `.' */ |
| 334 | if (ext_start == end - 1) { |
| 335 | sz = ulen; |
| 336 | ext_start = NULL; |
| 337 | } |
| 338 | break; |
| 339 | } |
| 340 | } |
| 341 | |
| 342 | if (ext_start == uname - 1) { |
| 343 | sz = ulen; |
| 344 | ext_start = NULL; |
| 345 | } else if (ext_start) { |
| 346 | /* |
| 347 | * Names which start with a dot could be just |
| 348 | * an extension eg. "...test". In this case Win95 |
| 349 | * uses the extension as the name and sets no extension. |
| 350 | */ |
| 351 | name_start = &uname[0]; |
| 352 | while (name_start < ext_start) { |
| 353 | if (!vfat_skip_char(*name_start)) |
| 354 | break; |
| 355 | name_start++; |
| 356 | } |
| 357 | if (name_start != ext_start) { |
| 358 | sz = ext_start - uname; |
| 359 | ext_start++; |
| 360 | } else { |
| 361 | sz = ulen; |
| 362 | ext_start = NULL; |
| 363 | } |
| 364 | } |
| 365 | |
| 366 | numtail_baselen = 6; |
| 367 | numtail2_baselen = 2; |
| 368 | for (baselen = i = 0, p = base, ip = uname; i < sz; i++, ip++) { |
| 369 | chl = to_shortname_char(nls, charbuf, sizeof(charbuf), |
| 370 | ip, &base_info); |
| 371 | if (chl == 0) |
| 372 | continue; |
| 373 | |
| 374 | if (baselen < 2 && (baselen + chl) > 2) |
| 375 | numtail2_baselen = baselen; |
| 376 | if (baselen < 6 && (baselen + chl) > 6) |
| 377 | numtail_baselen = baselen; |
| 378 | for (chi = 0; chi < chl; chi++) { |
| 379 | *p++ = charbuf[chi]; |
| 380 | baselen++; |
| 381 | if (baselen >= 8) |
| 382 | break; |
| 383 | } |
| 384 | if (baselen >= 8) { |
| 385 | if ((chi < chl - 1) || (ip + 1) - uname < sz) |
| 386 | is_shortname = 0; |
| 387 | break; |
| 388 | } |
| 389 | } |
| 390 | if (baselen == 0) { |
| 391 | return -EINVAL; |
| 392 | } |
| 393 | |
| 394 | extlen = 0; |
| 395 | if (ext_start) { |
| 396 | for (p = ext, ip = ext_start; extlen < 3 && ip < end; ip++) { |
| 397 | chl = to_shortname_char(nls, charbuf, sizeof(charbuf), |
| 398 | ip, &ext_info); |
| 399 | if (chl == 0) |
| 400 | continue; |
| 401 | |
| 402 | if ((extlen + chl) > 3) { |
| 403 | is_shortname = 0; |
| 404 | break; |
| 405 | } |
| 406 | for (chi = 0; chi < chl; chi++) { |
| 407 | *p++ = charbuf[chi]; |
| 408 | extlen++; |
| 409 | } |
| 410 | if (extlen >= 3) { |
| 411 | if (ip + 1 != end) |
| 412 | is_shortname = 0; |
| 413 | break; |
| 414 | } |
| 415 | } |
| 416 | } |
| 417 | ext[extlen] = '\0'; |
| 418 | base[baselen] = '\0'; |
| 419 | |
| 420 | /* Yes, it can happen. ".\xe5" would do it. */ |
| 421 | if (base[0] == DELETED_FLAG) |
| 422 | base[0] = 0x05; |
| 423 | |
| 424 | /* OK, at this point we know that base is not longer than 8 symbols, |
| 425 | * ext is not longer than 3, base is nonempty, both don't contain |
| 426 | * any bad symbols (lowercase transformed to uppercase). |
| 427 | */ |
| 428 | |
| 429 | memset(name_res, ' ', MSDOS_NAME); |
| 430 | memcpy(name_res, base, baselen); |
| 431 | memcpy(name_res + 8, ext, extlen); |
| 432 | *lcase = 0; |
| 433 | if (is_shortname && base_info.valid && ext_info.valid) { |
| 434 | if (vfat_find_form(dir, name_res) == 0) |
| 435 | return -EEXIST; |
| 436 | |
| 437 | if (opts->shortname & VFAT_SFN_CREATE_WIN95) { |
| 438 | return (base_info.upper && ext_info.upper); |
| 439 | } else if (opts->shortname & VFAT_SFN_CREATE_WINNT) { |
| 440 | if ((base_info.upper || base_info.lower) && |
| 441 | (ext_info.upper || ext_info.lower)) { |
| 442 | if (!base_info.upper && base_info.lower) |
| 443 | *lcase |= CASE_LOWER_BASE; |
| 444 | if (!ext_info.upper && ext_info.lower) |
| 445 | *lcase |= CASE_LOWER_EXT; |
| 446 | return 1; |
| 447 | } |
| 448 | return 0; |
| 449 | } else { |
| 450 | BUG(); |
| 451 | } |
| 452 | } |
| 453 | |
| 454 | if (opts->numtail == 0) |
| 455 | if (vfat_find_form(dir, name_res) < 0) |
| 456 | return 0; |
| 457 | |
| 458 | /* |
| 459 | * Try to find a unique extension. This used to |
| 460 | * iterate through all possibilities sequentially, |
| 461 | * but that gave extremely bad performance. Windows |
| 462 | * only tries a few cases before using random |
| 463 | * values for part of the base. |
| 464 | */ |
| 465 | |
| 466 | if (baselen > 6) { |
| 467 | baselen = numtail_baselen; |
| 468 | name_res[7] = ' '; |
| 469 | } |
| 470 | name_res[baselen] = '~'; |
| 471 | for (i = 1; i < 10; i++) { |
| 472 | name_res[baselen + 1] = i + '0'; |
| 473 | if (vfat_find_form(dir, name_res) < 0) |
| 474 | return 0; |
| 475 | } |
| 476 | |
Nikolaus Schulz | 30d1872 | 2010-04-01 02:21:10 +0900 | [diff] [blame] | 477 | i = jiffies; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 478 | sz = (jiffies >> 16) & 0x7; |
| 479 | if (baselen > 2) { |
| 480 | baselen = numtail2_baselen; |
| 481 | name_res[7] = ' '; |
| 482 | } |
| 483 | name_res[baselen + 4] = '~'; |
| 484 | name_res[baselen + 5] = '1' + sz; |
| 485 | while (1) { |
Nikolaus Schulz | 30d1872 | 2010-04-01 02:21:10 +0900 | [diff] [blame] | 486 | snprintf(buf, sizeof(buf), "%04X", i & 0xffff); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 487 | memcpy(&name_res[baselen], buf, 4); |
| 488 | if (vfat_find_form(dir, name_res) < 0) |
| 489 | break; |
| 490 | i -= 11; |
| 491 | } |
| 492 | return 0; |
| 493 | } |
| 494 | |
| 495 | /* Translate a string, including coded sequences into Unicode */ |
| 496 | static int |
| 497 | xlate_to_uni(const unsigned char *name, int len, unsigned char *outname, |
| 498 | int *longlen, int *outlen, int escape, int utf8, |
| 499 | struct nls_table *nls) |
| 500 | { |
| 501 | const unsigned char *ip; |
| 502 | unsigned char nc; |
| 503 | unsigned char *op; |
| 504 | unsigned int ec; |
| 505 | int i, k, fill; |
| 506 | int charlen; |
| 507 | |
| 508 | if (utf8) { |
Alan Stern | 0720a06 | 2011-11-17 16:42:19 -0500 | [diff] [blame] | 509 | *outlen = utf8s_to_utf16s(name, len, UTF16_HOST_ENDIAN, |
| 510 | (wchar_t *) outname, FAT_LFN_LEN + 2); |
OGAWA Hirofumi | 67638e4 | 2009-08-01 21:30:31 +0900 | [diff] [blame] | 511 | if (*outlen < 0) |
| 512 | return *outlen; |
Kevin Dankwardt | eeb5b4a | 2010-02-10 23:43:40 +0900 | [diff] [blame] | 513 | else if (*outlen > FAT_LFN_LEN) |
Keith Mok | f22032b | 2008-04-28 02:16:29 -0700 | [diff] [blame] | 514 | return -ENAMETOOLONG; |
| 515 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 516 | op = &outname[*outlen * sizeof(wchar_t)]; |
| 517 | } else { |
Namjae Jeon | 41f0c02 | 2012-03-23 15:02:38 -0700 | [diff] [blame] | 518 | for (i = 0, ip = name, op = outname, *outlen = 0; |
Namjae Jeon | d533df0 | 2012-03-23 15:02:39 -0700 | [diff] [blame] | 519 | i < len && *outlen < FAT_LFN_LEN; |
Namjae Jeon | 41f0c02 | 2012-03-23 15:02:38 -0700 | [diff] [blame] | 520 | *outlen += 1) { |
| 521 | if (escape && (*ip == ':')) { |
| 522 | if (i > len - 5) |
| 523 | return -EINVAL; |
| 524 | ec = 0; |
| 525 | for (k = 1; k < 5; k++) { |
| 526 | nc = ip[k]; |
| 527 | ec <<= 4; |
| 528 | if (nc >= '0' && nc <= '9') { |
| 529 | ec |= nc - '0'; |
| 530 | continue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 531 | } |
Namjae Jeon | 41f0c02 | 2012-03-23 15:02:38 -0700 | [diff] [blame] | 532 | if (nc >= 'a' && nc <= 'f') { |
| 533 | ec |= nc - ('a' - 10); |
| 534 | continue; |
| 535 | } |
| 536 | if (nc >= 'A' && nc <= 'F') { |
| 537 | ec |= nc - ('A' - 10); |
| 538 | continue; |
| 539 | } |
| 540 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 541 | } |
Namjae Jeon | 41f0c02 | 2012-03-23 15:02:38 -0700 | [diff] [blame] | 542 | *op++ = ec & 0xFF; |
| 543 | *op++ = ec >> 8; |
| 544 | ip += 5; |
| 545 | i += 5; |
| 546 | } else { |
| 547 | charlen = nls->char2uni(ip, len - i, |
| 548 | (wchar_t *)op); |
| 549 | if (charlen < 0) |
| 550 | return -EINVAL; |
| 551 | ip += charlen; |
| 552 | i += charlen; |
| 553 | op += 2; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 554 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 555 | } |
Namjae Jeon | 41f0c02 | 2012-03-23 15:02:38 -0700 | [diff] [blame] | 556 | if (i < len) |
| 557 | return -ENAMETOOLONG; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 558 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 559 | |
| 560 | *longlen = *outlen; |
| 561 | if (*outlen % 13) { |
| 562 | *op++ = 0; |
| 563 | *op++ = 0; |
| 564 | *outlen += 1; |
| 565 | if (*outlen % 13) { |
| 566 | fill = 13 - (*outlen % 13); |
| 567 | for (i = 0; i < fill; i++) { |
| 568 | *op++ = 0xff; |
| 569 | *op++ = 0xff; |
| 570 | } |
| 571 | *outlen += fill; |
| 572 | } |
| 573 | } |
| 574 | |
| 575 | return 0; |
| 576 | } |
| 577 | |
| 578 | static int vfat_build_slots(struct inode *dir, const unsigned char *name, |
| 579 | int len, int is_dir, int cluster, |
| 580 | struct timespec *ts, |
| 581 | struct msdos_dir_slot *slots, int *nr_slots) |
| 582 | { |
| 583 | struct msdos_sb_info *sbi = MSDOS_SB(dir->i_sb); |
| 584 | struct fat_mount_options *opts = &sbi->options; |
| 585 | struct msdos_dir_slot *ps; |
| 586 | struct msdos_dir_entry *de; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 587 | unsigned char cksum, lcase; |
| 588 | unsigned char msdos_name[MSDOS_NAME]; |
| 589 | wchar_t *uname; |
| 590 | __le16 time, date; |
OGAWA Hirofumi | 7decd1c | 2008-11-06 12:53:47 -0800 | [diff] [blame] | 591 | u8 time_cs; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 592 | int err, ulen, usize, i; |
| 593 | loff_t offset; |
| 594 | |
| 595 | *nr_slots = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 596 | |
OGAWA Hirofumi | c7a6c4e | 2008-04-28 02:16:29 -0700 | [diff] [blame] | 597 | uname = __getname(); |
| 598 | if (!uname) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 599 | return -ENOMEM; |
| 600 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 601 | err = xlate_to_uni(name, len, (unsigned char *)uname, &ulen, &usize, |
| 602 | opts->unicode_xlate, opts->utf8, sbi->nls_io); |
| 603 | if (err) |
| 604 | goto out_free; |
| 605 | |
| 606 | err = vfat_is_used_badchars(uname, ulen); |
| 607 | if (err) |
| 608 | goto out_free; |
| 609 | |
| 610 | err = vfat_create_shortname(dir, sbi->nls_disk, uname, ulen, |
| 611 | msdos_name, &lcase); |
| 612 | if (err < 0) |
| 613 | goto out_free; |
| 614 | else if (err == 1) { |
| 615 | de = (struct msdos_dir_entry *)slots; |
| 616 | err = 0; |
| 617 | goto shortname; |
| 618 | } |
| 619 | |
| 620 | /* build the entry of long file name */ |
OGAWA Hirofumi | 451cbaa | 2005-10-30 15:03:49 -0800 | [diff] [blame] | 621 | cksum = fat_checksum(msdos_name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 622 | |
| 623 | *nr_slots = usize / 13; |
| 624 | for (ps = slots, i = *nr_slots; i > 0; i--, ps++) { |
| 625 | ps->id = i; |
| 626 | ps->attr = ATTR_EXT; |
| 627 | ps->reserved = 0; |
| 628 | ps->alias_checksum = cksum; |
| 629 | ps->start = 0; |
| 630 | offset = (i - 1) * 13; |
| 631 | fatwchar_to16(ps->name0_4, uname + offset, 5); |
| 632 | fatwchar_to16(ps->name5_10, uname + offset + 5, 6); |
| 633 | fatwchar_to16(ps->name11_12, uname + offset + 11, 2); |
| 634 | } |
| 635 | slots[0].id |= 0x40; |
| 636 | de = (struct msdos_dir_entry *)ps; |
| 637 | |
| 638 | shortname: |
| 639 | /* build the entry of 8.3 alias name */ |
| 640 | (*nr_slots)++; |
| 641 | memcpy(de->name, msdos_name, MSDOS_NAME); |
| 642 | de->attr = is_dir ? ATTR_DIR : ATTR_ARCH; |
| 643 | de->lcase = lcase; |
OGAWA Hirofumi | 7decd1c | 2008-11-06 12:53:47 -0800 | [diff] [blame] | 644 | fat_time_unix2fat(sbi, ts, &time, &date, &time_cs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 645 | de->time = de->ctime = time; |
| 646 | de->date = de->cdate = de->adate = date; |
OGAWA Hirofumi | 7decd1c | 2008-11-06 12:53:47 -0800 | [diff] [blame] | 647 | de->ctime_cs = time_cs; |
Steven J. Magnani | a943ed7 | 2012-07-30 14:42:13 -0700 | [diff] [blame] | 648 | fat_set_start(de, cluster); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 649 | de->size = 0; |
| 650 | out_free: |
OGAWA Hirofumi | c7a6c4e | 2008-04-28 02:16:29 -0700 | [diff] [blame] | 651 | __putname(uname); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 652 | return err; |
| 653 | } |
| 654 | |
| 655 | static int vfat_add_entry(struct inode *dir, struct qstr *qname, int is_dir, |
| 656 | int cluster, struct timespec *ts, |
| 657 | struct fat_slot_info *sinfo) |
| 658 | { |
| 659 | struct msdos_dir_slot *slots; |
| 660 | unsigned int len; |
| 661 | int err, nr_slots; |
| 662 | |
| 663 | len = vfat_striptail_len(qname); |
| 664 | if (len == 0) |
| 665 | return -ENOENT; |
| 666 | |
Linus Torvalds | 8f59342 | 2008-05-19 19:53:01 -0700 | [diff] [blame] | 667 | slots = kmalloc(sizeof(*slots) * MSDOS_SLOTS, GFP_NOFS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 668 | if (slots == NULL) |
| 669 | return -ENOMEM; |
| 670 | |
| 671 | err = vfat_build_slots(dir, qname->name, len, is_dir, cluster, ts, |
| 672 | slots, &nr_slots); |
| 673 | if (err) |
| 674 | goto cleanup; |
| 675 | |
| 676 | err = fat_add_entries(dir, slots, nr_slots, sinfo); |
| 677 | if (err) |
| 678 | goto cleanup; |
| 679 | |
| 680 | /* update timestamp */ |
| 681 | dir->i_ctime = dir->i_mtime = dir->i_atime = *ts; |
| 682 | if (IS_DIRSYNC(dir)) |
| 683 | (void)fat_sync_inode(dir); |
| 684 | else |
| 685 | mark_inode_dirty(dir); |
| 686 | cleanup: |
| 687 | kfree(slots); |
| 688 | return err; |
| 689 | } |
| 690 | |
| 691 | static int vfat_find(struct inode *dir, struct qstr *qname, |
| 692 | struct fat_slot_info *sinfo) |
| 693 | { |
| 694 | unsigned int len = vfat_striptail_len(qname); |
| 695 | if (len == 0) |
| 696 | return -ENOENT; |
| 697 | return fat_search_long(dir, qname->name, len, sinfo); |
| 698 | } |
| 699 | |
OGAWA Hirofumi | 8045e29 | 2010-01-12 03:32:24 +0900 | [diff] [blame] | 700 | /* |
| 701 | * (nfsd's) anonymous disconnected dentry? |
| 702 | * NOTE: !IS_ROOT() is not anonymous (I.e. d_splice_alias() did the job). |
| 703 | */ |
| 704 | static int vfat_d_anon_disconn(struct dentry *dentry) |
| 705 | { |
| 706 | return IS_ROOT(dentry) && (dentry->d_flags & DCACHE_DISCONNECTED); |
| 707 | } |
| 708 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 709 | static struct dentry *vfat_lookup(struct inode *dir, struct dentry *dentry, |
Al Viro | 00cd8dd | 2012-06-10 17:13:09 -0400 | [diff] [blame] | 710 | unsigned int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 711 | { |
| 712 | struct super_block *sb = dir->i_sb; |
| 713 | struct fat_slot_info sinfo; |
OGAWA Hirofumi | 068f5ae | 2008-11-06 12:53:51 -0800 | [diff] [blame] | 714 | struct inode *inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 715 | struct dentry *alias; |
OGAWA Hirofumi | 1b52467 | 2008-11-06 12:53:51 -0800 | [diff] [blame] | 716 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 717 | |
Marco Stornelli | e40b34c | 2012-10-06 12:40:03 +0200 | [diff] [blame] | 718 | mutex_lock(&MSDOS_SB(sb)->s_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 719 | |
| 720 | err = vfat_find(dir, &dentry->d_name, &sinfo); |
| 721 | if (err) { |
OGAWA Hirofumi | 068f5ae | 2008-11-06 12:53:51 -0800 | [diff] [blame] | 722 | if (err == -ENOENT) { |
OGAWA Hirofumi | 068f5ae | 2008-11-06 12:53:51 -0800 | [diff] [blame] | 723 | inode = NULL; |
| 724 | goto out; |
| 725 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 726 | goto error; |
| 727 | } |
OGAWA Hirofumi | 1b52467 | 2008-11-06 12:53:51 -0800 | [diff] [blame] | 728 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 729 | inode = fat_build_inode(sb, sinfo.de, sinfo.i_pos); |
| 730 | brelse(sinfo.bh); |
| 731 | if (IS_ERR(inode)) { |
OGAWA Hirofumi | 068f5ae | 2008-11-06 12:53:51 -0800 | [diff] [blame] | 732 | err = PTR_ERR(inode); |
| 733 | goto error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 734 | } |
OGAWA Hirofumi | 1b52467 | 2008-11-06 12:53:51 -0800 | [diff] [blame] | 735 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 736 | alias = d_find_alias(inode); |
Al Viro | 1ead0e7 | 2014-12-02 15:59:37 -0800 | [diff] [blame] | 737 | /* |
| 738 | * Checking "alias->d_parent == dentry->d_parent" to make sure |
| 739 | * FS is not corrupted (especially double linked dir). |
| 740 | */ |
| 741 | if (alias && alias->d_parent == dentry->d_parent && |
| 742 | !vfat_d_anon_disconn(alias)) { |
OGAWA Hirofumi | 1b52467 | 2008-11-06 12:53:51 -0800 | [diff] [blame] | 743 | /* |
OGAWA Hirofumi | 8045e29 | 2010-01-12 03:32:24 +0900 | [diff] [blame] | 744 | * This inode has non anonymous-DCACHE_DISCONNECTED |
| 745 | * dentry. This means, the user did ->lookup() by an |
| 746 | * another name (longname vs 8.3 alias of it) in past. |
OGAWA Hirofumi | 1b52467 | 2008-11-06 12:53:51 -0800 | [diff] [blame] | 747 | * |
| 748 | * Switch to new one for reason of locality if possible. |
| 749 | */ |
OGAWA Hirofumi | 1c13a24 | 2008-11-06 12:53:52 -0800 | [diff] [blame] | 750 | BUG_ON(d_unhashed(alias)); |
| 751 | if (!S_ISDIR(inode->i_mode)) |
| 752 | d_move(alias, dentry); |
| 753 | iput(inode); |
Marco Stornelli | e40b34c | 2012-10-06 12:40:03 +0200 | [diff] [blame] | 754 | mutex_unlock(&MSDOS_SB(sb)->s_lock); |
OGAWA Hirofumi | 1c13a24 | 2008-11-06 12:53:52 -0800 | [diff] [blame] | 755 | return alias; |
OGAWA Hirofumi | 8045e29 | 2010-01-12 03:32:24 +0900 | [diff] [blame] | 756 | } else |
| 757 | dput(alias); |
| 758 | |
OGAWA Hirofumi | 068f5ae | 2008-11-06 12:53:51 -0800 | [diff] [blame] | 759 | out: |
Marco Stornelli | e40b34c | 2012-10-06 12:40:03 +0200 | [diff] [blame] | 760 | mutex_unlock(&MSDOS_SB(sb)->s_lock); |
Al Viro | 1ead0e7 | 2014-12-02 15:59:37 -0800 | [diff] [blame] | 761 | if (!inode) |
| 762 | dentry->d_time = dir->i_version; |
| 763 | return d_splice_alias(inode, dentry); |
OGAWA Hirofumi | 068f5ae | 2008-11-06 12:53:51 -0800 | [diff] [blame] | 764 | error: |
Marco Stornelli | e40b34c | 2012-10-06 12:40:03 +0200 | [diff] [blame] | 765 | mutex_unlock(&MSDOS_SB(sb)->s_lock); |
OGAWA Hirofumi | 068f5ae | 2008-11-06 12:53:51 -0800 | [diff] [blame] | 766 | return ERR_PTR(err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 767 | } |
| 768 | |
Al Viro | 4acdaf2 | 2011-07-26 01:42:34 -0400 | [diff] [blame] | 769 | static int vfat_create(struct inode *dir, struct dentry *dentry, umode_t mode, |
Al Viro | ebfc3b4 | 2012-06-10 18:05:36 -0400 | [diff] [blame] | 770 | bool excl) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 771 | { |
| 772 | struct super_block *sb = dir->i_sb; |
| 773 | struct inode *inode; |
| 774 | struct fat_slot_info sinfo; |
| 775 | struct timespec ts; |
| 776 | int err; |
| 777 | |
Marco Stornelli | e40b34c | 2012-10-06 12:40:03 +0200 | [diff] [blame] | 778 | mutex_lock(&MSDOS_SB(sb)->s_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 779 | |
| 780 | ts = CURRENT_TIME_SEC; |
| 781 | err = vfat_add_entry(dir, &dentry->d_name, 0, 0, &ts, &sinfo); |
| 782 | if (err) |
| 783 | goto out; |
| 784 | dir->i_version++; |
| 785 | |
| 786 | inode = fat_build_inode(sb, sinfo.de, sinfo.i_pos); |
| 787 | brelse(sinfo.bh); |
| 788 | if (IS_ERR(inode)) { |
| 789 | err = PTR_ERR(inode); |
| 790 | goto out; |
| 791 | } |
| 792 | inode->i_version++; |
| 793 | inode->i_mtime = inode->i_atime = inode->i_ctime = ts; |
| 794 | /* timestamp is already written, so mark_inode_dirty() is unneeded. */ |
| 795 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 796 | d_instantiate(dentry, inode); |
| 797 | out: |
Marco Stornelli | e40b34c | 2012-10-06 12:40:03 +0200 | [diff] [blame] | 798 | mutex_unlock(&MSDOS_SB(sb)->s_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 799 | return err; |
| 800 | } |
| 801 | |
| 802 | static int vfat_rmdir(struct inode *dir, struct dentry *dentry) |
| 803 | { |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 804 | struct inode *inode = d_inode(dentry); |
Linus Torvalds | 8f59342 | 2008-05-19 19:53:01 -0700 | [diff] [blame] | 805 | struct super_block *sb = dir->i_sb; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 806 | struct fat_slot_info sinfo; |
| 807 | int err; |
| 808 | |
Marco Stornelli | e40b34c | 2012-10-06 12:40:03 +0200 | [diff] [blame] | 809 | mutex_lock(&MSDOS_SB(sb)->s_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 810 | |
| 811 | err = fat_dir_empty(inode); |
| 812 | if (err) |
| 813 | goto out; |
| 814 | err = vfat_find(dir, &dentry->d_name, &sinfo); |
| 815 | if (err) |
| 816 | goto out; |
| 817 | |
| 818 | err = fat_remove_entries(dir, &sinfo); /* and releases bh */ |
| 819 | if (err) |
| 820 | goto out; |
Dave Hansen | 9a53c3a | 2006-09-30 23:29:03 -0700 | [diff] [blame] | 821 | drop_nlink(dir); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 822 | |
Dave Hansen | ce71ec3 | 2006-09-30 23:29:06 -0700 | [diff] [blame] | 823 | clear_nlink(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 824 | inode->i_mtime = inode->i_atime = CURRENT_TIME_SEC; |
| 825 | fat_detach(inode); |
Al Viro | 1ead0e7 | 2014-12-02 15:59:37 -0800 | [diff] [blame] | 826 | dentry->d_time = dir->i_version; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 827 | out: |
Marco Stornelli | e40b34c | 2012-10-06 12:40:03 +0200 | [diff] [blame] | 828 | mutex_unlock(&MSDOS_SB(sb)->s_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 829 | |
| 830 | return err; |
| 831 | } |
| 832 | |
| 833 | static int vfat_unlink(struct inode *dir, struct dentry *dentry) |
| 834 | { |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 835 | struct inode *inode = d_inode(dentry); |
Linus Torvalds | 8f59342 | 2008-05-19 19:53:01 -0700 | [diff] [blame] | 836 | struct super_block *sb = dir->i_sb; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 837 | struct fat_slot_info sinfo; |
| 838 | int err; |
| 839 | |
Marco Stornelli | e40b34c | 2012-10-06 12:40:03 +0200 | [diff] [blame] | 840 | mutex_lock(&MSDOS_SB(sb)->s_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 841 | |
| 842 | err = vfat_find(dir, &dentry->d_name, &sinfo); |
| 843 | if (err) |
| 844 | goto out; |
| 845 | |
| 846 | err = fat_remove_entries(dir, &sinfo); /* and releases bh */ |
| 847 | if (err) |
| 848 | goto out; |
Dave Hansen | ce71ec3 | 2006-09-30 23:29:06 -0700 | [diff] [blame] | 849 | clear_nlink(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 850 | inode->i_mtime = inode->i_atime = CURRENT_TIME_SEC; |
| 851 | fat_detach(inode); |
Al Viro | 1ead0e7 | 2014-12-02 15:59:37 -0800 | [diff] [blame] | 852 | dentry->d_time = dir->i_version; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 853 | out: |
Marco Stornelli | e40b34c | 2012-10-06 12:40:03 +0200 | [diff] [blame] | 854 | mutex_unlock(&MSDOS_SB(sb)->s_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 855 | |
| 856 | return err; |
| 857 | } |
| 858 | |
Al Viro | 18bb1db | 2011-07-26 01:41:39 -0400 | [diff] [blame] | 859 | static int vfat_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 860 | { |
| 861 | struct super_block *sb = dir->i_sb; |
| 862 | struct inode *inode; |
| 863 | struct fat_slot_info sinfo; |
| 864 | struct timespec ts; |
| 865 | int err, cluster; |
| 866 | |
Marco Stornelli | e40b34c | 2012-10-06 12:40:03 +0200 | [diff] [blame] | 867 | mutex_lock(&MSDOS_SB(sb)->s_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 868 | |
| 869 | ts = CURRENT_TIME_SEC; |
| 870 | cluster = fat_alloc_new_dir(dir, &ts); |
| 871 | if (cluster < 0) { |
| 872 | err = cluster; |
| 873 | goto out; |
| 874 | } |
| 875 | err = vfat_add_entry(dir, &dentry->d_name, 1, cluster, &ts, &sinfo); |
| 876 | if (err) |
| 877 | goto out_free; |
| 878 | dir->i_version++; |
Dave Hansen | d8c76e6 | 2006-09-30 23:29:04 -0700 | [diff] [blame] | 879 | inc_nlink(dir); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 880 | |
| 881 | inode = fat_build_inode(sb, sinfo.de, sinfo.i_pos); |
| 882 | brelse(sinfo.bh); |
| 883 | if (IS_ERR(inode)) { |
| 884 | err = PTR_ERR(inode); |
| 885 | /* the directory was completed, just return a error */ |
| 886 | goto out; |
| 887 | } |
| 888 | inode->i_version++; |
Miklos Szeredi | bfe8684 | 2011-10-28 14:13:29 +0200 | [diff] [blame] | 889 | set_nlink(inode, 2); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 890 | inode->i_mtime = inode->i_atime = inode->i_ctime = ts; |
| 891 | /* timestamp is already written, so mark_inode_dirty() is unneeded. */ |
| 892 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 893 | d_instantiate(dentry, inode); |
| 894 | |
Marco Stornelli | e40b34c | 2012-10-06 12:40:03 +0200 | [diff] [blame] | 895 | mutex_unlock(&MSDOS_SB(sb)->s_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 896 | return 0; |
| 897 | |
| 898 | out_free: |
| 899 | fat_free_clusters(dir, cluster); |
| 900 | out: |
Marco Stornelli | e40b34c | 2012-10-06 12:40:03 +0200 | [diff] [blame] | 901 | mutex_unlock(&MSDOS_SB(sb)->s_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 902 | return err; |
| 903 | } |
| 904 | |
| 905 | static int vfat_rename(struct inode *old_dir, struct dentry *old_dentry, |
| 906 | struct inode *new_dir, struct dentry *new_dentry) |
| 907 | { |
| 908 | struct buffer_head *dotdot_bh; |
| 909 | struct msdos_dir_entry *dotdot_de; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 910 | struct inode *old_inode, *new_inode; |
| 911 | struct fat_slot_info old_sinfo, sinfo; |
| 912 | struct timespec ts; |
Steven J. Magnani | 7669e8f | 2012-10-04 17:14:45 -0700 | [diff] [blame] | 913 | loff_t new_i_pos; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 914 | int err, is_dir, update_dotdot, corrupt = 0; |
Linus Torvalds | 8f59342 | 2008-05-19 19:53:01 -0700 | [diff] [blame] | 915 | struct super_block *sb = old_dir->i_sb; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 916 | |
| 917 | old_sinfo.bh = sinfo.bh = dotdot_bh = NULL; |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 918 | old_inode = d_inode(old_dentry); |
| 919 | new_inode = d_inode(new_dentry); |
Marco Stornelli | e40b34c | 2012-10-06 12:40:03 +0200 | [diff] [blame] | 920 | mutex_lock(&MSDOS_SB(sb)->s_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 921 | err = vfat_find(old_dir, &old_dentry->d_name, &old_sinfo); |
| 922 | if (err) |
| 923 | goto out; |
| 924 | |
| 925 | is_dir = S_ISDIR(old_inode->i_mode); |
| 926 | update_dotdot = (is_dir && old_dir != new_dir); |
| 927 | if (update_dotdot) { |
Steven J. Magnani | 7669e8f | 2012-10-04 17:14:45 -0700 | [diff] [blame] | 928 | if (fat_get_dotdot_entry(old_inode, &dotdot_bh, &dotdot_de)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 929 | err = -EIO; |
| 930 | goto out; |
| 931 | } |
| 932 | } |
| 933 | |
| 934 | ts = CURRENT_TIME_SEC; |
| 935 | if (new_inode) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 936 | if (is_dir) { |
| 937 | err = fat_dir_empty(new_inode); |
| 938 | if (err) |
| 939 | goto out; |
| 940 | } |
OGAWA Hirofumi | 9131dd4 | 2005-10-30 15:03:50 -0800 | [diff] [blame] | 941 | new_i_pos = MSDOS_I(new_inode)->i_pos; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 942 | fat_detach(new_inode); |
| 943 | } else { |
| 944 | err = vfat_add_entry(new_dir, &new_dentry->d_name, is_dir, 0, |
| 945 | &ts, &sinfo); |
| 946 | if (err) |
| 947 | goto out; |
OGAWA Hirofumi | 9131dd4 | 2005-10-30 15:03:50 -0800 | [diff] [blame] | 948 | new_i_pos = sinfo.i_pos; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 949 | } |
| 950 | new_dir->i_version++; |
| 951 | |
| 952 | fat_detach(old_inode); |
OGAWA Hirofumi | 9131dd4 | 2005-10-30 15:03:50 -0800 | [diff] [blame] | 953 | fat_attach(old_inode, new_i_pos); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 954 | if (IS_DIRSYNC(new_dir)) { |
| 955 | err = fat_sync_inode(old_inode); |
| 956 | if (err) |
| 957 | goto error_inode; |
| 958 | } else |
| 959 | mark_inode_dirty(old_inode); |
| 960 | |
| 961 | if (update_dotdot) { |
Steven J. Magnani | a943ed7 | 2012-07-30 14:42:13 -0700 | [diff] [blame] | 962 | fat_set_start(dotdot_de, MSDOS_I(new_dir)->i_logstart); |
Al Viro | b522412 | 2009-06-07 13:44:36 -0400 | [diff] [blame] | 963 | mark_buffer_dirty_inode(dotdot_bh, old_inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 964 | if (IS_DIRSYNC(new_dir)) { |
| 965 | err = sync_dirty_buffer(dotdot_bh); |
| 966 | if (err) |
| 967 | goto error_dotdot; |
| 968 | } |
Dave Hansen | 9a53c3a | 2006-09-30 23:29:03 -0700 | [diff] [blame] | 969 | drop_nlink(old_dir); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 970 | if (!new_inode) |
Dave Hansen | d8c76e6 | 2006-09-30 23:29:04 -0700 | [diff] [blame] | 971 | inc_nlink(new_dir); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 972 | } |
| 973 | |
| 974 | err = fat_remove_entries(old_dir, &old_sinfo); /* and releases bh */ |
| 975 | old_sinfo.bh = NULL; |
| 976 | if (err) |
| 977 | goto error_dotdot; |
| 978 | old_dir->i_version++; |
| 979 | old_dir->i_ctime = old_dir->i_mtime = ts; |
| 980 | if (IS_DIRSYNC(old_dir)) |
| 981 | (void)fat_sync_inode(old_dir); |
| 982 | else |
| 983 | mark_inode_dirty(old_dir); |
| 984 | |
| 985 | if (new_inode) { |
Dave Hansen | 9a53c3a | 2006-09-30 23:29:03 -0700 | [diff] [blame] | 986 | drop_nlink(new_inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 987 | if (is_dir) |
Dave Hansen | 9a53c3a | 2006-09-30 23:29:03 -0700 | [diff] [blame] | 988 | drop_nlink(new_inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 989 | new_inode->i_ctime = ts; |
| 990 | } |
| 991 | out: |
| 992 | brelse(sinfo.bh); |
| 993 | brelse(dotdot_bh); |
| 994 | brelse(old_sinfo.bh); |
Marco Stornelli | e40b34c | 2012-10-06 12:40:03 +0200 | [diff] [blame] | 995 | mutex_unlock(&MSDOS_SB(sb)->s_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 996 | |
| 997 | return err; |
| 998 | |
| 999 | error_dotdot: |
| 1000 | /* data cluster is shared, serious corruption */ |
| 1001 | corrupt = 1; |
| 1002 | |
| 1003 | if (update_dotdot) { |
Steven J. Magnani | a943ed7 | 2012-07-30 14:42:13 -0700 | [diff] [blame] | 1004 | fat_set_start(dotdot_de, MSDOS_I(old_dir)->i_logstart); |
Al Viro | b522412 | 2009-06-07 13:44:36 -0400 | [diff] [blame] | 1005 | mark_buffer_dirty_inode(dotdot_bh, old_inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1006 | corrupt |= sync_dirty_buffer(dotdot_bh); |
| 1007 | } |
| 1008 | error_inode: |
| 1009 | fat_detach(old_inode); |
| 1010 | fat_attach(old_inode, old_sinfo.i_pos); |
| 1011 | if (new_inode) { |
OGAWA Hirofumi | 9131dd4 | 2005-10-30 15:03:50 -0800 | [diff] [blame] | 1012 | fat_attach(new_inode, new_i_pos); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1013 | if (corrupt) |
| 1014 | corrupt |= fat_sync_inode(new_inode); |
| 1015 | } else { |
| 1016 | /* |
| 1017 | * If new entry was not sharing the data cluster, it |
| 1018 | * shouldn't be serious corruption. |
| 1019 | */ |
| 1020 | int err2 = fat_remove_entries(new_dir, &sinfo); |
| 1021 | if (corrupt) |
| 1022 | corrupt |= err2; |
| 1023 | sinfo.bh = NULL; |
| 1024 | } |
| 1025 | if (corrupt < 0) { |
Denis Karpov | 85c7859 | 2009-06-04 02:34:22 +0900 | [diff] [blame] | 1026 | fat_fs_error(new_dir->i_sb, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1027 | "%s: Filesystem corrupted (i_pos %lld)", |
Harvey Harrison | 8e24eea | 2008-04-30 00:55:09 -0700 | [diff] [blame] | 1028 | __func__, sinfo.i_pos); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1029 | } |
| 1030 | goto out; |
| 1031 | } |
| 1032 | |
Arjan van de Ven | c5ef1c4 | 2007-02-12 00:55:40 -0800 | [diff] [blame] | 1033 | static const struct inode_operations vfat_dir_inode_operations = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1034 | .create = vfat_create, |
| 1035 | .lookup = vfat_lookup, |
| 1036 | .unlink = vfat_unlink, |
| 1037 | .mkdir = vfat_mkdir, |
| 1038 | .rmdir = vfat_rmdir, |
| 1039 | .rename = vfat_rename, |
OGAWA Hirofumi | 1278fdd | 2008-04-28 02:16:25 -0700 | [diff] [blame] | 1040 | .setattr = fat_setattr, |
OGAWA Hirofumi | da63fc7 | 2006-11-16 01:19:28 -0800 | [diff] [blame] | 1041 | .getattr = fat_getattr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1042 | }; |
| 1043 | |
Al Viro | 3d23985 | 2010-12-18 10:44:00 -0500 | [diff] [blame] | 1044 | static void setup(struct super_block *sb) |
| 1045 | { |
OGAWA Hirofumi | 384f5c9 | 2011-04-12 21:08:37 +0900 | [diff] [blame] | 1046 | MSDOS_SB(sb)->dir_ops = &vfat_dir_inode_operations; |
Al Viro | 3d23985 | 2010-12-18 10:44:00 -0500 | [diff] [blame] | 1047 | if (MSDOS_SB(sb)->options.name_check != 's') |
| 1048 | sb->s_d_op = &vfat_ci_dentry_ops; |
| 1049 | else |
| 1050 | sb->s_d_op = &vfat_dentry_ops; |
| 1051 | } |
| 1052 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1053 | static int vfat_fill_super(struct super_block *sb, void *data, int silent) |
| 1054 | { |
OGAWA Hirofumi | 384f5c9 | 2011-04-12 21:08:37 +0900 | [diff] [blame] | 1055 | return fat_fill_super(sb, data, silent, 1, setup); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1056 | } |
| 1057 | |
Al Viro | 152a083 | 2010-07-25 00:46:55 +0400 | [diff] [blame] | 1058 | static struct dentry *vfat_mount(struct file_system_type *fs_type, |
David Howells | 454e239 | 2006-06-23 02:02:57 -0700 | [diff] [blame] | 1059 | int flags, const char *dev_name, |
Al Viro | 152a083 | 2010-07-25 00:46:55 +0400 | [diff] [blame] | 1060 | void *data) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1061 | { |
Al Viro | 152a083 | 2010-07-25 00:46:55 +0400 | [diff] [blame] | 1062 | return mount_bdev(fs_type, flags, dev_name, data, vfat_fill_super); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1063 | } |
| 1064 | |
| 1065 | static struct file_system_type vfat_fs_type = { |
| 1066 | .owner = THIS_MODULE, |
| 1067 | .name = "vfat", |
Al Viro | 152a083 | 2010-07-25 00:46:55 +0400 | [diff] [blame] | 1068 | .mount = vfat_mount, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1069 | .kill_sb = kill_block_super, |
| 1070 | .fs_flags = FS_REQUIRES_DEV, |
| 1071 | }; |
Eric W. Biederman | 7f78e03 | 2013-03-02 19:39:14 -0800 | [diff] [blame] | 1072 | MODULE_ALIAS_FS("vfat"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1073 | |
| 1074 | static int __init init_vfat_fs(void) |
| 1075 | { |
| 1076 | return register_filesystem(&vfat_fs_type); |
| 1077 | } |
| 1078 | |
| 1079 | static void __exit exit_vfat_fs(void) |
| 1080 | { |
| 1081 | unregister_filesystem(&vfat_fs_type); |
| 1082 | } |
| 1083 | |
| 1084 | MODULE_LICENSE("GPL"); |
| 1085 | MODULE_DESCRIPTION("VFAT filesystem support"); |
| 1086 | MODULE_AUTHOR("Gordon Chaffee"); |
| 1087 | |
| 1088 | module_init(init_vfat_fs) |
| 1089 | module_exit(exit_vfat_fs) |