Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | #define MSNFS /* HACK HACK */ |
| 2 | /* |
| 3 | * linux/fs/nfsd/vfs.c |
| 4 | * |
| 5 | * File operations used by nfsd. Some of these have been ripped from |
| 6 | * other parts of the kernel because they weren't exported, others |
| 7 | * are partial duplicates with added or changed functionality. |
| 8 | * |
| 9 | * Note that several functions dget() the dentry upon which they want |
| 10 | * to act, most notably those that create directory entries. Response |
| 11 | * dentry's are dput()'d if necessary in the release callback. |
| 12 | * So if you notice code paths that apparently fail to dput() the |
| 13 | * dentry, don't worry--they have been taken care of. |
| 14 | * |
| 15 | * Copyright (C) 1995-1999 Olaf Kirch <okir@monad.swb.de> |
| 16 | * Zerocpy NFS support (C) 2002 Hirokazu Takahashi <taka@valinux.co.jp> |
| 17 | */ |
| 18 | |
| 19 | #include <linux/config.h> |
| 20 | #include <linux/string.h> |
| 21 | #include <linux/time.h> |
| 22 | #include <linux/errno.h> |
| 23 | #include <linux/fs.h> |
| 24 | #include <linux/file.h> |
| 25 | #include <linux/mount.h> |
| 26 | #include <linux/major.h> |
| 27 | #include <linux/ext2_fs.h> |
| 28 | #include <linux/proc_fs.h> |
| 29 | #include <linux/stat.h> |
| 30 | #include <linux/fcntl.h> |
| 31 | #include <linux/net.h> |
| 32 | #include <linux/unistd.h> |
| 33 | #include <linux/slab.h> |
| 34 | #include <linux/pagemap.h> |
| 35 | #include <linux/in.h> |
| 36 | #include <linux/module.h> |
| 37 | #include <linux/namei.h> |
| 38 | #include <linux/vfs.h> |
| 39 | #include <linux/delay.h> |
| 40 | #include <linux/sunrpc/svc.h> |
| 41 | #include <linux/nfsd/nfsd.h> |
| 42 | #ifdef CONFIG_NFSD_V3 |
| 43 | #include <linux/nfs3.h> |
| 44 | #include <linux/nfsd/xdr3.h> |
| 45 | #endif /* CONFIG_NFSD_V3 */ |
| 46 | #include <linux/nfsd/nfsfh.h> |
| 47 | #include <linux/quotaops.h> |
Robert Love | 0eeca28 | 2005-07-12 17:06:03 -0400 | [diff] [blame] | 48 | #include <linux/fsnotify.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 49 | #include <linux/posix_acl.h> |
| 50 | #include <linux/posix_acl_xattr.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 51 | #include <linux/xattr.h> |
Christoph Hellwig | 5be196e | 2006-01-09 20:51:55 -0800 | [diff] [blame] | 52 | #ifdef CONFIG_NFSD_V4 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 53 | #include <linux/nfs4.h> |
| 54 | #include <linux/nfs4_acl.h> |
| 55 | #include <linux/nfsd_idmap.h> |
| 56 | #include <linux/security.h> |
| 57 | #endif /* CONFIG_NFSD_V4 */ |
| 58 | |
| 59 | #include <asm/uaccess.h> |
| 60 | |
| 61 | #define NFSDDBG_FACILITY NFSDDBG_FILEOP |
| 62 | #define NFSD_PARANOIA |
| 63 | |
| 64 | |
| 65 | /* We must ignore files (but only files) which might have mandatory |
| 66 | * locks on them because there is no way to know if the accesser has |
| 67 | * the lock. |
| 68 | */ |
| 69 | #define IS_ISMNDLK(i) (S_ISREG((i)->i_mode) && MANDATORY_LOCK(i)) |
| 70 | |
| 71 | /* |
| 72 | * This is a cache of readahead params that help us choose the proper |
| 73 | * readahead strategy. Initially, we set all readahead parameters to 0 |
| 74 | * and let the VFS handle things. |
| 75 | * If you increase the number of cached files very much, you'll need to |
| 76 | * add a hash table here. |
| 77 | */ |
| 78 | struct raparms { |
| 79 | struct raparms *p_next; |
| 80 | unsigned int p_count; |
| 81 | ino_t p_ino; |
| 82 | dev_t p_dev; |
| 83 | int p_set; |
| 84 | struct file_ra_state p_ra; |
| 85 | }; |
| 86 | |
| 87 | static struct raparms * raparml; |
| 88 | static struct raparms * raparm_cache; |
| 89 | |
| 90 | /* |
| 91 | * Called from nfsd_lookup and encode_dirent. Check if we have crossed |
| 92 | * a mount point. |
| 93 | * Returns -EAGAIN leaving *dpp and *expp unchanged, |
| 94 | * or nfs_ok having possibly changed *dpp and *expp |
| 95 | */ |
| 96 | int |
| 97 | nfsd_cross_mnt(struct svc_rqst *rqstp, struct dentry **dpp, |
| 98 | struct svc_export **expp) |
| 99 | { |
| 100 | struct svc_export *exp = *expp, *exp2 = NULL; |
| 101 | struct dentry *dentry = *dpp; |
| 102 | struct vfsmount *mnt = mntget(exp->ex_mnt); |
| 103 | struct dentry *mounts = dget(dentry); |
| 104 | int err = nfs_ok; |
| 105 | |
| 106 | while (follow_down(&mnt,&mounts)&&d_mountpoint(mounts)); |
| 107 | |
| 108 | exp2 = exp_get_by_name(exp->ex_client, mnt, mounts, &rqstp->rq_chandle); |
| 109 | if (IS_ERR(exp2)) { |
| 110 | err = PTR_ERR(exp2); |
| 111 | dput(mounts); |
| 112 | mntput(mnt); |
| 113 | goto out; |
| 114 | } |
| 115 | if (exp2 && ((exp->ex_flags & NFSEXP_CROSSMOUNT) || EX_NOHIDE(exp2))) { |
| 116 | /* successfully crossed mount point */ |
| 117 | exp_put(exp); |
| 118 | *expp = exp2; |
| 119 | dput(dentry); |
| 120 | *dpp = mounts; |
| 121 | } else { |
| 122 | if (exp2) exp_put(exp2); |
| 123 | dput(mounts); |
| 124 | } |
| 125 | mntput(mnt); |
| 126 | out: |
| 127 | return err; |
| 128 | } |
| 129 | |
| 130 | /* |
| 131 | * Look up one component of a pathname. |
| 132 | * N.B. After this call _both_ fhp and resfh need an fh_put |
| 133 | * |
| 134 | * If the lookup would cross a mountpoint, and the mounted filesystem |
| 135 | * is exported to the client with NFSEXP_NOHIDE, then the lookup is |
| 136 | * accepted as it stands and the mounted directory is |
| 137 | * returned. Otherwise the covered directory is returned. |
| 138 | * NOTE: this mountpoint crossing is not supported properly by all |
| 139 | * clients and is explicitly disallowed for NFSv3 |
| 140 | * NeilBrown <neilb@cse.unsw.edu.au> |
| 141 | */ |
| 142 | int |
| 143 | nfsd_lookup(struct svc_rqst *rqstp, struct svc_fh *fhp, const char *name, |
| 144 | int len, struct svc_fh *resfh) |
| 145 | { |
| 146 | struct svc_export *exp; |
| 147 | struct dentry *dparent; |
| 148 | struct dentry *dentry; |
| 149 | int err; |
| 150 | |
| 151 | dprintk("nfsd: nfsd_lookup(fh %s, %.*s)\n", SVCFH_fmt(fhp), len,name); |
| 152 | |
| 153 | /* Obtain dentry and export. */ |
| 154 | err = fh_verify(rqstp, fhp, S_IFDIR, MAY_EXEC); |
| 155 | if (err) |
| 156 | return err; |
| 157 | |
| 158 | dparent = fhp->fh_dentry; |
| 159 | exp = fhp->fh_export; |
| 160 | exp_get(exp); |
| 161 | |
| 162 | err = nfserr_acces; |
| 163 | |
| 164 | /* Lookup the name, but don't follow links */ |
| 165 | if (isdotent(name, len)) { |
| 166 | if (len==1) |
| 167 | dentry = dget(dparent); |
| 168 | else if (dparent != exp->ex_dentry) { |
| 169 | dentry = dget_parent(dparent); |
| 170 | } else if (!EX_NOHIDE(exp)) |
| 171 | dentry = dget(dparent); /* .. == . just like at / */ |
| 172 | else { |
| 173 | /* checking mountpoint crossing is very different when stepping up */ |
| 174 | struct svc_export *exp2 = NULL; |
| 175 | struct dentry *dp; |
| 176 | struct vfsmount *mnt = mntget(exp->ex_mnt); |
| 177 | dentry = dget(dparent); |
| 178 | while(dentry == mnt->mnt_root && follow_up(&mnt, &dentry)) |
| 179 | ; |
| 180 | dp = dget_parent(dentry); |
| 181 | dput(dentry); |
| 182 | dentry = dp; |
| 183 | |
| 184 | exp2 = exp_parent(exp->ex_client, mnt, dentry, |
| 185 | &rqstp->rq_chandle); |
| 186 | if (IS_ERR(exp2)) { |
| 187 | err = PTR_ERR(exp2); |
| 188 | dput(dentry); |
| 189 | mntput(mnt); |
| 190 | goto out_nfserr; |
| 191 | } |
| 192 | if (!exp2) { |
| 193 | dput(dentry); |
| 194 | dentry = dget(dparent); |
| 195 | } else { |
| 196 | exp_put(exp); |
| 197 | exp = exp2; |
| 198 | } |
| 199 | mntput(mnt); |
| 200 | } |
| 201 | } else { |
| 202 | fh_lock(fhp); |
| 203 | dentry = lookup_one_len(name, dparent, len); |
| 204 | err = PTR_ERR(dentry); |
| 205 | if (IS_ERR(dentry)) |
| 206 | goto out_nfserr; |
| 207 | /* |
| 208 | * check if we have crossed a mount point ... |
| 209 | */ |
| 210 | if (d_mountpoint(dentry)) { |
| 211 | if ((err = nfsd_cross_mnt(rqstp, &dentry, &exp))) { |
| 212 | dput(dentry); |
| 213 | goto out_nfserr; |
| 214 | } |
| 215 | } |
| 216 | } |
| 217 | /* |
| 218 | * Note: we compose the file handle now, but as the |
| 219 | * dentry may be negative, it may need to be updated. |
| 220 | */ |
| 221 | err = fh_compose(resfh, exp, dentry, fhp); |
| 222 | if (!err && !dentry->d_inode) |
| 223 | err = nfserr_noent; |
| 224 | dput(dentry); |
| 225 | out: |
| 226 | exp_put(exp); |
| 227 | return err; |
| 228 | |
| 229 | out_nfserr: |
| 230 | err = nfserrno(err); |
| 231 | goto out; |
| 232 | } |
| 233 | |
| 234 | /* |
| 235 | * Set various file attributes. |
| 236 | * N.B. After this call fhp needs an fh_put |
| 237 | */ |
| 238 | int |
| 239 | nfsd_setattr(struct svc_rqst *rqstp, struct svc_fh *fhp, struct iattr *iap, |
| 240 | int check_guard, time_t guardtime) |
| 241 | { |
| 242 | struct dentry *dentry; |
| 243 | struct inode *inode; |
| 244 | int accmode = MAY_SATTR; |
| 245 | int ftype = 0; |
| 246 | int imode; |
| 247 | int err; |
| 248 | int size_change = 0; |
| 249 | |
| 250 | if (iap->ia_valid & (ATTR_ATIME | ATTR_MTIME | ATTR_SIZE)) |
| 251 | accmode |= MAY_WRITE|MAY_OWNER_OVERRIDE; |
| 252 | if (iap->ia_valid & ATTR_SIZE) |
| 253 | ftype = S_IFREG; |
| 254 | |
| 255 | /* Get inode */ |
| 256 | err = fh_verify(rqstp, fhp, ftype, accmode); |
NeilBrown | 15b7a1b | 2005-11-07 01:00:23 -0800 | [diff] [blame] | 257 | if (err) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 258 | goto out; |
| 259 | |
| 260 | dentry = fhp->fh_dentry; |
| 261 | inode = dentry->d_inode; |
| 262 | |
NeilBrown | 15b7a1b | 2005-11-07 01:00:23 -0800 | [diff] [blame] | 263 | /* Ignore any mode updates on symlinks */ |
| 264 | if (S_ISLNK(inode->i_mode)) |
| 265 | iap->ia_valid &= ~ATTR_MODE; |
| 266 | |
| 267 | if (!iap->ia_valid) |
| 268 | goto out; |
| 269 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 270 | /* NFSv2 does not differentiate between "set-[ac]time-to-now" |
| 271 | * which only requires access, and "set-[ac]time-to-X" which |
| 272 | * requires ownership. |
| 273 | * So if it looks like it might be "set both to the same time which |
| 274 | * is close to now", and if inode_change_ok fails, then we |
| 275 | * convert to "set to now" instead of "set to explicit time" |
| 276 | * |
| 277 | * We only call inode_change_ok as the last test as technically |
| 278 | * it is not an interface that we should be using. It is only |
| 279 | * valid if the filesystem does not define it's own i_op->setattr. |
| 280 | */ |
| 281 | #define BOTH_TIME_SET (ATTR_ATIME_SET | ATTR_MTIME_SET) |
| 282 | #define MAX_TOUCH_TIME_ERROR (30*60) |
| 283 | if ((iap->ia_valid & BOTH_TIME_SET) == BOTH_TIME_SET |
| 284 | && iap->ia_mtime.tv_sec == iap->ia_atime.tv_sec |
| 285 | ) { |
| 286 | /* Looks probable. Now just make sure time is in the right ballpark. |
| 287 | * Solaris, at least, doesn't seem to care what the time request is. |
| 288 | * We require it be within 30 minutes of now. |
| 289 | */ |
| 290 | time_t delta = iap->ia_atime.tv_sec - get_seconds(); |
| 291 | if (delta<0) delta = -delta; |
| 292 | if (delta < MAX_TOUCH_TIME_ERROR && |
| 293 | inode_change_ok(inode, iap) != 0) { |
| 294 | /* turn off ATTR_[AM]TIME_SET but leave ATTR_[AM]TIME |
| 295 | * this will cause notify_change to set these times to "now" |
| 296 | */ |
| 297 | iap->ia_valid &= ~BOTH_TIME_SET; |
| 298 | } |
| 299 | } |
| 300 | |
| 301 | /* The size case is special. It changes the file as well as the attributes. */ |
| 302 | if (iap->ia_valid & ATTR_SIZE) { |
| 303 | if (iap->ia_size < inode->i_size) { |
| 304 | err = nfsd_permission(fhp->fh_export, dentry, MAY_TRUNC|MAY_OWNER_OVERRIDE); |
| 305 | if (err) |
| 306 | goto out; |
| 307 | } |
| 308 | |
| 309 | /* |
| 310 | * If we are changing the size of the file, then |
| 311 | * we need to break all leases. |
| 312 | */ |
| 313 | err = break_lease(inode, FMODE_WRITE | O_NONBLOCK); |
| 314 | if (err == -EWOULDBLOCK) |
| 315 | err = -ETIMEDOUT; |
| 316 | if (err) /* ENOMEM or EWOULDBLOCK */ |
| 317 | goto out_nfserr; |
| 318 | |
| 319 | err = get_write_access(inode); |
| 320 | if (err) |
| 321 | goto out_nfserr; |
| 322 | |
| 323 | size_change = 1; |
| 324 | err = locks_verify_truncate(inode, NULL, iap->ia_size); |
| 325 | if (err) { |
| 326 | put_write_access(inode); |
| 327 | goto out_nfserr; |
| 328 | } |
| 329 | DQUOT_INIT(inode); |
| 330 | } |
| 331 | |
| 332 | imode = inode->i_mode; |
| 333 | if (iap->ia_valid & ATTR_MODE) { |
| 334 | iap->ia_mode &= S_IALLUGO; |
| 335 | imode = iap->ia_mode |= (imode & ~S_IALLUGO); |
| 336 | } |
| 337 | |
| 338 | /* Revoke setuid/setgid bit on chown/chgrp */ |
| 339 | if ((iap->ia_valid & ATTR_UID) && iap->ia_uid != inode->i_uid) |
| 340 | iap->ia_valid |= ATTR_KILL_SUID; |
| 341 | if ((iap->ia_valid & ATTR_GID) && iap->ia_gid != inode->i_gid) |
| 342 | iap->ia_valid |= ATTR_KILL_SGID; |
| 343 | |
| 344 | /* Change the attributes. */ |
| 345 | |
| 346 | iap->ia_valid |= ATTR_CTIME; |
| 347 | |
| 348 | err = nfserr_notsync; |
| 349 | if (!check_guard || guardtime == inode->i_ctime.tv_sec) { |
| 350 | fh_lock(fhp); |
| 351 | err = notify_change(dentry, iap); |
| 352 | err = nfserrno(err); |
| 353 | fh_unlock(fhp); |
| 354 | } |
| 355 | if (size_change) |
| 356 | put_write_access(inode); |
| 357 | if (!err) |
| 358 | if (EX_ISSYNC(fhp->fh_export)) |
| 359 | write_inode_now(inode, 1); |
| 360 | out: |
| 361 | return err; |
| 362 | |
| 363 | out_nfserr: |
| 364 | err = nfserrno(err); |
| 365 | goto out; |
| 366 | } |
| 367 | |
Christoph Hellwig | 5be196e | 2006-01-09 20:51:55 -0800 | [diff] [blame] | 368 | #if defined(CONFIG_NFSD_V2_ACL) || \ |
| 369 | defined(CONFIG_NFSD_V3_ACL) || \ |
| 370 | defined(CONFIG_NFSD_V4) |
| 371 | static ssize_t nfsd_getxattr(struct dentry *dentry, char *key, void **buf) |
| 372 | { |
| 373 | ssize_t buflen; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 374 | |
Christoph Hellwig | 5be196e | 2006-01-09 20:51:55 -0800 | [diff] [blame] | 375 | buflen = vfs_getxattr(dentry, key, NULL, 0); |
| 376 | if (buflen <= 0) |
| 377 | return buflen; |
| 378 | |
| 379 | *buf = kmalloc(buflen, GFP_KERNEL); |
| 380 | if (!*buf) |
| 381 | return -ENOMEM; |
| 382 | |
NeilBrown | b5872b0 | 2006-04-10 22:55:26 -0700 | [diff] [blame] | 383 | return vfs_getxattr(dentry, key, *buf, buflen); |
Christoph Hellwig | 5be196e | 2006-01-09 20:51:55 -0800 | [diff] [blame] | 384 | } |
| 385 | #endif |
| 386 | |
| 387 | #if defined(CONFIG_NFSD_V4) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 388 | static int |
| 389 | set_nfsv4_acl_one(struct dentry *dentry, struct posix_acl *pacl, char *key) |
| 390 | { |
| 391 | int len; |
| 392 | size_t buflen; |
| 393 | char *buf = NULL; |
| 394 | int error = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 395 | |
| 396 | buflen = posix_acl_xattr_size(pacl->a_count); |
| 397 | buf = kmalloc(buflen, GFP_KERNEL); |
| 398 | error = -ENOMEM; |
| 399 | if (buf == NULL) |
| 400 | goto out; |
| 401 | |
| 402 | len = posix_acl_to_xattr(pacl, buf, buflen); |
| 403 | if (len < 0) { |
| 404 | error = len; |
| 405 | goto out; |
| 406 | } |
| 407 | |
Christoph Hellwig | 5be196e | 2006-01-09 20:51:55 -0800 | [diff] [blame] | 408 | error = vfs_setxattr(dentry, key, buf, len, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 409 | out: |
| 410 | kfree(buf); |
| 411 | return error; |
| 412 | } |
| 413 | |
| 414 | int |
| 415 | nfsd4_set_nfs4_acl(struct svc_rqst *rqstp, struct svc_fh *fhp, |
| 416 | struct nfs4_acl *acl) |
| 417 | { |
| 418 | int error; |
| 419 | struct dentry *dentry; |
| 420 | struct inode *inode; |
| 421 | struct posix_acl *pacl = NULL, *dpacl = NULL; |
| 422 | unsigned int flags = 0; |
| 423 | |
| 424 | /* Get inode */ |
| 425 | error = fh_verify(rqstp, fhp, 0 /* S_IFREG */, MAY_SATTR); |
| 426 | if (error) |
| 427 | goto out; |
| 428 | |
| 429 | dentry = fhp->fh_dentry; |
| 430 | inode = dentry->d_inode; |
| 431 | if (S_ISDIR(inode->i_mode)) |
| 432 | flags = NFS4_ACL_DIR; |
| 433 | |
| 434 | error = nfs4_acl_nfsv4_to_posix(acl, &pacl, &dpacl, flags); |
| 435 | if (error == -EINVAL) { |
| 436 | error = nfserr_attrnotsupp; |
| 437 | goto out; |
| 438 | } else if (error < 0) |
| 439 | goto out_nfserr; |
| 440 | |
| 441 | if (pacl) { |
Christoph Hellwig | 9a59f45 | 2005-06-23 00:10:19 -0700 | [diff] [blame] | 442 | error = set_nfsv4_acl_one(dentry, pacl, POSIX_ACL_XATTR_ACCESS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 443 | if (error < 0) |
| 444 | goto out_nfserr; |
| 445 | } |
| 446 | |
| 447 | if (dpacl) { |
Christoph Hellwig | 9a59f45 | 2005-06-23 00:10:19 -0700 | [diff] [blame] | 448 | error = set_nfsv4_acl_one(dentry, dpacl, POSIX_ACL_XATTR_DEFAULT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 449 | if (error < 0) |
| 450 | goto out_nfserr; |
| 451 | } |
| 452 | |
| 453 | error = nfs_ok; |
| 454 | |
| 455 | out: |
| 456 | posix_acl_release(pacl); |
| 457 | posix_acl_release(dpacl); |
| 458 | return (error); |
| 459 | out_nfserr: |
| 460 | error = nfserrno(error); |
| 461 | goto out; |
| 462 | } |
| 463 | |
| 464 | static struct posix_acl * |
| 465 | _get_posix_acl(struct dentry *dentry, char *key) |
| 466 | { |
Christoph Hellwig | 5be196e | 2006-01-09 20:51:55 -0800 | [diff] [blame] | 467 | void *buf = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 468 | struct posix_acl *pacl = NULL; |
Christoph Hellwig | 5be196e | 2006-01-09 20:51:55 -0800 | [diff] [blame] | 469 | int buflen; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 470 | |
Christoph Hellwig | 5be196e | 2006-01-09 20:51:55 -0800 | [diff] [blame] | 471 | buflen = nfsd_getxattr(dentry, key, &buf); |
| 472 | if (!buflen) |
| 473 | buflen = -ENODATA; |
| 474 | if (buflen <= 0) |
| 475 | return ERR_PTR(buflen); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 476 | |
| 477 | pacl = posix_acl_from_xattr(buf, buflen); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 478 | kfree(buf); |
| 479 | return pacl; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 480 | } |
| 481 | |
| 482 | int |
| 483 | nfsd4_get_nfs4_acl(struct svc_rqst *rqstp, struct dentry *dentry, struct nfs4_acl **acl) |
| 484 | { |
| 485 | struct inode *inode = dentry->d_inode; |
| 486 | int error = 0; |
| 487 | struct posix_acl *pacl = NULL, *dpacl = NULL; |
| 488 | unsigned int flags = 0; |
| 489 | |
Christoph Hellwig | 9a59f45 | 2005-06-23 00:10:19 -0700 | [diff] [blame] | 490 | pacl = _get_posix_acl(dentry, POSIX_ACL_XATTR_ACCESS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 491 | if (IS_ERR(pacl) && PTR_ERR(pacl) == -ENODATA) |
| 492 | pacl = posix_acl_from_mode(inode->i_mode, GFP_KERNEL); |
| 493 | if (IS_ERR(pacl)) { |
| 494 | error = PTR_ERR(pacl); |
| 495 | pacl = NULL; |
| 496 | goto out; |
| 497 | } |
| 498 | |
| 499 | if (S_ISDIR(inode->i_mode)) { |
Christoph Hellwig | 9a59f45 | 2005-06-23 00:10:19 -0700 | [diff] [blame] | 500 | dpacl = _get_posix_acl(dentry, POSIX_ACL_XATTR_DEFAULT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 501 | if (IS_ERR(dpacl) && PTR_ERR(dpacl) == -ENODATA) |
| 502 | dpacl = NULL; |
| 503 | else if (IS_ERR(dpacl)) { |
| 504 | error = PTR_ERR(dpacl); |
| 505 | dpacl = NULL; |
| 506 | goto out; |
| 507 | } |
| 508 | flags = NFS4_ACL_DIR; |
| 509 | } |
| 510 | |
| 511 | *acl = nfs4_acl_posix_to_nfsv4(pacl, dpacl, flags); |
| 512 | if (IS_ERR(*acl)) { |
| 513 | error = PTR_ERR(*acl); |
| 514 | *acl = NULL; |
| 515 | } |
| 516 | out: |
| 517 | posix_acl_release(pacl); |
| 518 | posix_acl_release(dpacl); |
| 519 | return error; |
| 520 | } |
| 521 | |
| 522 | #endif /* defined(CONFIG_NFS_V4) */ |
| 523 | |
| 524 | #ifdef CONFIG_NFSD_V3 |
| 525 | /* |
| 526 | * Check server access rights to a file system object |
| 527 | */ |
| 528 | struct accessmap { |
| 529 | u32 access; |
| 530 | int how; |
| 531 | }; |
| 532 | static struct accessmap nfs3_regaccess[] = { |
| 533 | { NFS3_ACCESS_READ, MAY_READ }, |
| 534 | { NFS3_ACCESS_EXECUTE, MAY_EXEC }, |
| 535 | { NFS3_ACCESS_MODIFY, MAY_WRITE|MAY_TRUNC }, |
| 536 | { NFS3_ACCESS_EXTEND, MAY_WRITE }, |
| 537 | |
| 538 | { 0, 0 } |
| 539 | }; |
| 540 | |
| 541 | static struct accessmap nfs3_diraccess[] = { |
| 542 | { NFS3_ACCESS_READ, MAY_READ }, |
| 543 | { NFS3_ACCESS_LOOKUP, MAY_EXEC }, |
| 544 | { NFS3_ACCESS_MODIFY, MAY_EXEC|MAY_WRITE|MAY_TRUNC }, |
| 545 | { NFS3_ACCESS_EXTEND, MAY_EXEC|MAY_WRITE }, |
| 546 | { NFS3_ACCESS_DELETE, MAY_REMOVE }, |
| 547 | |
| 548 | { 0, 0 } |
| 549 | }; |
| 550 | |
| 551 | static struct accessmap nfs3_anyaccess[] = { |
| 552 | /* Some clients - Solaris 2.6 at least, make an access call |
| 553 | * to the server to check for access for things like /dev/null |
| 554 | * (which really, the server doesn't care about). So |
| 555 | * We provide simple access checking for them, looking |
| 556 | * mainly at mode bits, and we make sure to ignore read-only |
| 557 | * filesystem checks |
| 558 | */ |
| 559 | { NFS3_ACCESS_READ, MAY_READ }, |
| 560 | { NFS3_ACCESS_EXECUTE, MAY_EXEC }, |
| 561 | { NFS3_ACCESS_MODIFY, MAY_WRITE|MAY_LOCAL_ACCESS }, |
| 562 | { NFS3_ACCESS_EXTEND, MAY_WRITE|MAY_LOCAL_ACCESS }, |
| 563 | |
| 564 | { 0, 0 } |
| 565 | }; |
| 566 | |
| 567 | int |
| 568 | nfsd_access(struct svc_rqst *rqstp, struct svc_fh *fhp, u32 *access, u32 *supported) |
| 569 | { |
| 570 | struct accessmap *map; |
| 571 | struct svc_export *export; |
| 572 | struct dentry *dentry; |
| 573 | u32 query, result = 0, sresult = 0; |
| 574 | unsigned int error; |
| 575 | |
| 576 | error = fh_verify(rqstp, fhp, 0, MAY_NOP); |
| 577 | if (error) |
| 578 | goto out; |
| 579 | |
| 580 | export = fhp->fh_export; |
| 581 | dentry = fhp->fh_dentry; |
| 582 | |
| 583 | if (S_ISREG(dentry->d_inode->i_mode)) |
| 584 | map = nfs3_regaccess; |
| 585 | else if (S_ISDIR(dentry->d_inode->i_mode)) |
| 586 | map = nfs3_diraccess; |
| 587 | else |
| 588 | map = nfs3_anyaccess; |
| 589 | |
| 590 | |
| 591 | query = *access; |
| 592 | for (; map->access; map++) { |
| 593 | if (map->access & query) { |
| 594 | unsigned int err2; |
| 595 | |
| 596 | sresult |= map->access; |
| 597 | |
| 598 | err2 = nfsd_permission(export, dentry, map->how); |
| 599 | switch (err2) { |
| 600 | case nfs_ok: |
| 601 | result |= map->access; |
| 602 | break; |
| 603 | |
| 604 | /* the following error codes just mean the access was not allowed, |
| 605 | * rather than an error occurred */ |
| 606 | case nfserr_rofs: |
| 607 | case nfserr_acces: |
| 608 | case nfserr_perm: |
| 609 | /* simply don't "or" in the access bit. */ |
| 610 | break; |
| 611 | default: |
| 612 | error = err2; |
| 613 | goto out; |
| 614 | } |
| 615 | } |
| 616 | } |
| 617 | *access = result; |
| 618 | if (supported) |
| 619 | *supported = sresult; |
| 620 | |
| 621 | out: |
| 622 | return error; |
| 623 | } |
| 624 | #endif /* CONFIG_NFSD_V3 */ |
| 625 | |
| 626 | |
| 627 | |
| 628 | /* |
| 629 | * Open an existing file or directory. |
| 630 | * The access argument indicates the type of open (read/write/lock) |
| 631 | * N.B. After this call fhp needs an fh_put |
| 632 | */ |
| 633 | int |
| 634 | nfsd_open(struct svc_rqst *rqstp, struct svc_fh *fhp, int type, |
| 635 | int access, struct file **filp) |
| 636 | { |
| 637 | struct dentry *dentry; |
| 638 | struct inode *inode; |
| 639 | int flags = O_RDONLY|O_LARGEFILE, err; |
| 640 | |
| 641 | /* |
| 642 | * If we get here, then the client has already done an "open", |
| 643 | * and (hopefully) checked permission - so allow OWNER_OVERRIDE |
| 644 | * in case a chmod has now revoked permission. |
| 645 | */ |
| 646 | err = fh_verify(rqstp, fhp, type, access | MAY_OWNER_OVERRIDE); |
| 647 | if (err) |
| 648 | goto out; |
| 649 | |
| 650 | dentry = fhp->fh_dentry; |
| 651 | inode = dentry->d_inode; |
| 652 | |
| 653 | /* Disallow write access to files with the append-only bit set |
| 654 | * or any access when mandatory locking enabled |
| 655 | */ |
| 656 | err = nfserr_perm; |
| 657 | if (IS_APPEND(inode) && (access & MAY_WRITE)) |
| 658 | goto out; |
| 659 | if (IS_ISMNDLK(inode)) |
| 660 | goto out; |
| 661 | |
| 662 | if (!inode->i_fop) |
| 663 | goto out; |
| 664 | |
| 665 | /* |
| 666 | * Check to see if there are any leases on this file. |
| 667 | * This may block while leases are broken. |
| 668 | */ |
| 669 | err = break_lease(inode, O_NONBLOCK | ((access & MAY_WRITE) ? FMODE_WRITE : 0)); |
| 670 | if (err == -EWOULDBLOCK) |
| 671 | err = -ETIMEDOUT; |
| 672 | if (err) /* NOMEM or WOULDBLOCK */ |
| 673 | goto out_nfserr; |
| 674 | |
| 675 | if (access & MAY_WRITE) { |
| 676 | flags = O_WRONLY|O_LARGEFILE; |
| 677 | |
| 678 | DQUOT_INIT(inode); |
| 679 | } |
| 680 | *filp = dentry_open(dget(dentry), mntget(fhp->fh_export->ex_mnt), flags); |
| 681 | if (IS_ERR(*filp)) |
| 682 | err = PTR_ERR(*filp); |
| 683 | out_nfserr: |
| 684 | if (err) |
| 685 | err = nfserrno(err); |
| 686 | out: |
| 687 | return err; |
| 688 | } |
| 689 | |
| 690 | /* |
| 691 | * Close a file. |
| 692 | */ |
| 693 | void |
| 694 | nfsd_close(struct file *filp) |
| 695 | { |
| 696 | fput(filp); |
| 697 | } |
| 698 | |
| 699 | /* |
| 700 | * Sync a file |
| 701 | * As this calls fsync (not fdatasync) there is no need for a write_inode |
| 702 | * after it. |
| 703 | */ |
David Shaw | a334de2 | 2006-01-06 00:19:58 -0800 | [diff] [blame] | 704 | static inline int nfsd_dosync(struct file *filp, struct dentry *dp, |
Arjan van de Ven | 99ac48f | 2006-03-28 01:56:41 -0800 | [diff] [blame] | 705 | const struct file_operations *fop) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 706 | { |
| 707 | struct inode *inode = dp->d_inode; |
| 708 | int (*fsync) (struct file *, struct dentry *, int); |
YAMAMOTO Takashi | f193fba | 2006-01-18 17:43:13 -0800 | [diff] [blame] | 709 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 710 | |
YAMAMOTO Takashi | f193fba | 2006-01-18 17:43:13 -0800 | [diff] [blame] | 711 | err = filemap_fdatawrite(inode->i_mapping); |
| 712 | if (err == 0 && fop && (fsync = fop->fsync)) |
| 713 | err = fsync(filp, dp, 0); |
| 714 | if (err == 0) |
| 715 | err = filemap_fdatawait(inode->i_mapping); |
David Shaw | a334de2 | 2006-01-06 00:19:58 -0800 | [diff] [blame] | 716 | |
YAMAMOTO Takashi | f193fba | 2006-01-18 17:43:13 -0800 | [diff] [blame] | 717 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 718 | } |
| 719 | |
| 720 | |
David Shaw | a334de2 | 2006-01-06 00:19:58 -0800 | [diff] [blame] | 721 | static int |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 722 | nfsd_sync(struct file *filp) |
| 723 | { |
David Shaw | a334de2 | 2006-01-06 00:19:58 -0800 | [diff] [blame] | 724 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 725 | struct inode *inode = filp->f_dentry->d_inode; |
| 726 | dprintk("nfsd: sync file %s\n", filp->f_dentry->d_name.name); |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 727 | mutex_lock(&inode->i_mutex); |
David Shaw | a334de2 | 2006-01-06 00:19:58 -0800 | [diff] [blame] | 728 | err=nfsd_dosync(filp, filp->f_dentry, filp->f_op); |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 729 | mutex_unlock(&inode->i_mutex); |
David Shaw | a334de2 | 2006-01-06 00:19:58 -0800 | [diff] [blame] | 730 | |
| 731 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 732 | } |
| 733 | |
YAMAMOTO Takashi | f193fba | 2006-01-18 17:43:13 -0800 | [diff] [blame] | 734 | int |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 735 | nfsd_sync_dir(struct dentry *dp) |
| 736 | { |
YAMAMOTO Takashi | f193fba | 2006-01-18 17:43:13 -0800 | [diff] [blame] | 737 | return nfsd_dosync(NULL, dp, dp->d_inode->i_fop); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 738 | } |
| 739 | |
| 740 | /* |
| 741 | * Obtain the readahead parameters for the file |
| 742 | * specified by (dev, ino). |
| 743 | */ |
| 744 | static DEFINE_SPINLOCK(ra_lock); |
| 745 | |
| 746 | static inline struct raparms * |
| 747 | nfsd_get_raparms(dev_t dev, ino_t ino) |
| 748 | { |
| 749 | struct raparms *ra, **rap, **frap = NULL; |
| 750 | int depth = 0; |
| 751 | |
| 752 | spin_lock(&ra_lock); |
| 753 | for (rap = &raparm_cache; (ra = *rap); rap = &ra->p_next) { |
| 754 | if (ra->p_ino == ino && ra->p_dev == dev) |
| 755 | goto found; |
| 756 | depth++; |
| 757 | if (ra->p_count == 0) |
| 758 | frap = rap; |
| 759 | } |
| 760 | depth = nfsdstats.ra_size*11/10; |
| 761 | if (!frap) { |
| 762 | spin_unlock(&ra_lock); |
| 763 | return NULL; |
| 764 | } |
| 765 | rap = frap; |
| 766 | ra = *frap; |
| 767 | ra->p_dev = dev; |
| 768 | ra->p_ino = ino; |
| 769 | ra->p_set = 0; |
| 770 | found: |
| 771 | if (rap != &raparm_cache) { |
| 772 | *rap = ra->p_next; |
| 773 | ra->p_next = raparm_cache; |
| 774 | raparm_cache = ra; |
| 775 | } |
| 776 | ra->p_count++; |
| 777 | nfsdstats.ra_depth[depth*10/nfsdstats.ra_size]++; |
| 778 | spin_unlock(&ra_lock); |
| 779 | return ra; |
| 780 | } |
| 781 | |
| 782 | /* |
| 783 | * Grab and keep cached pages assosiated with a file in the svc_rqst |
| 784 | * so that they can be passed to the netowork sendmsg/sendpage routines |
| 785 | * directrly. They will be released after the sending has completed. |
| 786 | */ |
| 787 | static int |
| 788 | nfsd_read_actor(read_descriptor_t *desc, struct page *page, unsigned long offset , unsigned long size) |
| 789 | { |
| 790 | unsigned long count = desc->count; |
| 791 | struct svc_rqst *rqstp = desc->arg.data; |
| 792 | |
| 793 | if (size > count) |
| 794 | size = count; |
| 795 | |
| 796 | if (rqstp->rq_res.page_len == 0) { |
| 797 | get_page(page); |
| 798 | rqstp->rq_respages[rqstp->rq_resused++] = page; |
| 799 | rqstp->rq_res.page_base = offset; |
| 800 | rqstp->rq_res.page_len = size; |
| 801 | } else if (page != rqstp->rq_respages[rqstp->rq_resused-1]) { |
| 802 | get_page(page); |
| 803 | rqstp->rq_respages[rqstp->rq_resused++] = page; |
| 804 | rqstp->rq_res.page_len += size; |
| 805 | } else { |
| 806 | rqstp->rq_res.page_len += size; |
| 807 | } |
| 808 | |
| 809 | desc->count = count - size; |
| 810 | desc->written += size; |
| 811 | return size; |
| 812 | } |
| 813 | |
NeilBrown | 7e8f059 | 2006-01-18 17:43:14 -0800 | [diff] [blame] | 814 | static int |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 815 | nfsd_vfs_read(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file, |
| 816 | loff_t offset, struct kvec *vec, int vlen, unsigned long *count) |
| 817 | { |
| 818 | struct inode *inode; |
| 819 | struct raparms *ra; |
| 820 | mm_segment_t oldfs; |
| 821 | int err; |
| 822 | |
| 823 | err = nfserr_perm; |
| 824 | inode = file->f_dentry->d_inode; |
| 825 | #ifdef MSNFS |
| 826 | if ((fhp->fh_export->ex_flags & NFSEXP_MSNFS) && |
| 827 | (!lock_may_read(inode, offset, *count))) |
| 828 | goto out; |
| 829 | #endif |
| 830 | |
| 831 | /* Get readahead parameters */ |
| 832 | ra = nfsd_get_raparms(inode->i_sb->s_dev, inode->i_ino); |
| 833 | |
| 834 | if (ra && ra->p_set) |
| 835 | file->f_ra = ra->p_ra; |
| 836 | |
| 837 | if (file->f_op->sendfile) { |
| 838 | svc_pushback_unused_pages(rqstp); |
| 839 | err = file->f_op->sendfile(file, &offset, *count, |
| 840 | nfsd_read_actor, rqstp); |
| 841 | } else { |
| 842 | oldfs = get_fs(); |
| 843 | set_fs(KERNEL_DS); |
| 844 | err = vfs_readv(file, (struct iovec __user *)vec, vlen, &offset); |
| 845 | set_fs(oldfs); |
| 846 | } |
| 847 | |
| 848 | /* Write back readahead params */ |
| 849 | if (ra) { |
| 850 | spin_lock(&ra_lock); |
| 851 | ra->p_ra = file->f_ra; |
| 852 | ra->p_set = 1; |
| 853 | ra->p_count--; |
| 854 | spin_unlock(&ra_lock); |
| 855 | } |
| 856 | |
| 857 | if (err >= 0) { |
| 858 | nfsdstats.io_read += err; |
| 859 | *count = err; |
| 860 | err = 0; |
Robert Love | 0eeca28 | 2005-07-12 17:06:03 -0400 | [diff] [blame] | 861 | fsnotify_access(file->f_dentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 862 | } else |
| 863 | err = nfserrno(err); |
| 864 | out: |
| 865 | return err; |
| 866 | } |
| 867 | |
Neil Brown | 9f708e4 | 2006-01-06 00:19:59 -0800 | [diff] [blame] | 868 | static void kill_suid(struct dentry *dentry) |
| 869 | { |
| 870 | struct iattr ia; |
| 871 | ia.ia_valid = ATTR_KILL_SUID | ATTR_KILL_SGID; |
| 872 | |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 873 | mutex_lock(&dentry->d_inode->i_mutex); |
Neil Brown | 9f708e4 | 2006-01-06 00:19:59 -0800 | [diff] [blame] | 874 | notify_change(dentry, &ia); |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 875 | mutex_unlock(&dentry->d_inode->i_mutex); |
Neil Brown | 9f708e4 | 2006-01-06 00:19:59 -0800 | [diff] [blame] | 876 | } |
| 877 | |
NeilBrown | 7e8f059 | 2006-01-18 17:43:14 -0800 | [diff] [blame] | 878 | static int |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 879 | nfsd_vfs_write(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file, |
| 880 | loff_t offset, struct kvec *vec, int vlen, |
| 881 | unsigned long cnt, int *stablep) |
| 882 | { |
| 883 | struct svc_export *exp; |
| 884 | struct dentry *dentry; |
| 885 | struct inode *inode; |
| 886 | mm_segment_t oldfs; |
| 887 | int err = 0; |
| 888 | int stable = *stablep; |
| 889 | |
NeilBrown | 45bd3b3 | 2006-01-18 17:43:50 -0800 | [diff] [blame] | 890 | #ifdef MSNFS |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 891 | err = nfserr_perm; |
| 892 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 893 | if ((fhp->fh_export->ex_flags & NFSEXP_MSNFS) && |
| 894 | (!lock_may_write(file->f_dentry->d_inode, offset, cnt))) |
| 895 | goto out; |
| 896 | #endif |
| 897 | |
| 898 | dentry = file->f_dentry; |
| 899 | inode = dentry->d_inode; |
| 900 | exp = fhp->fh_export; |
| 901 | |
| 902 | /* |
| 903 | * Request sync writes if |
| 904 | * - the sync export option has been set, or |
| 905 | * - the client requested O_SYNC behavior (NFSv3 feature). |
| 906 | * - The file system doesn't support fsync(). |
| 907 | * When gathered writes have been configured for this volume, |
| 908 | * flushing the data to disk is handled separately below. |
| 909 | */ |
| 910 | |
| 911 | if (file->f_op->fsync == 0) {/* COMMIT3 cannot work */ |
| 912 | stable = 2; |
| 913 | *stablep = 2; /* FILE_SYNC */ |
| 914 | } |
| 915 | |
| 916 | if (!EX_ISSYNC(exp)) |
| 917 | stable = 0; |
| 918 | if (stable && !EX_WGATHER(exp)) |
| 919 | file->f_flags |= O_SYNC; |
| 920 | |
| 921 | /* Write the data. */ |
| 922 | oldfs = get_fs(); set_fs(KERNEL_DS); |
| 923 | err = vfs_writev(file, (struct iovec __user *)vec, vlen, &offset); |
| 924 | set_fs(oldfs); |
| 925 | if (err >= 0) { |
| 926 | nfsdstats.io_write += cnt; |
Robert Love | 0eeca28 | 2005-07-12 17:06:03 -0400 | [diff] [blame] | 927 | fsnotify_modify(file->f_dentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 928 | } |
| 929 | |
| 930 | /* clear setuid/setgid flag after write */ |
Neil Brown | 9f708e4 | 2006-01-06 00:19:59 -0800 | [diff] [blame] | 931 | if (err >= 0 && (inode->i_mode & (S_ISUID | S_ISGID))) |
| 932 | kill_suid(dentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 933 | |
| 934 | if (err >= 0 && stable) { |
| 935 | static ino_t last_ino; |
| 936 | static dev_t last_dev; |
| 937 | |
| 938 | /* |
| 939 | * Gathered writes: If another process is currently |
| 940 | * writing to the file, there's a high chance |
| 941 | * this is another nfsd (triggered by a bulk write |
| 942 | * from a client's biod). Rather than syncing the |
| 943 | * file with each write request, we sleep for 10 msec. |
| 944 | * |
| 945 | * I don't know if this roughly approximates |
| 946 | * C. Juszak's idea of gathered writes, but it's a |
| 947 | * nice and simple solution (IMHO), and it seems to |
| 948 | * work:-) |
| 949 | */ |
| 950 | if (EX_WGATHER(exp)) { |
| 951 | if (atomic_read(&inode->i_writecount) > 1 |
| 952 | || (last_ino == inode->i_ino && last_dev == inode->i_sb->s_dev)) { |
| 953 | dprintk("nfsd: write defer %d\n", current->pid); |
| 954 | msleep(10); |
| 955 | dprintk("nfsd: write resume %d\n", current->pid); |
| 956 | } |
| 957 | |
| 958 | if (inode->i_state & I_DIRTY) { |
| 959 | dprintk("nfsd: write sync %d\n", current->pid); |
David Shaw | a334de2 | 2006-01-06 00:19:58 -0800 | [diff] [blame] | 960 | err=nfsd_sync(file); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 961 | } |
| 962 | #if 0 |
| 963 | wake_up(&inode->i_wait); |
| 964 | #endif |
| 965 | } |
| 966 | last_ino = inode->i_ino; |
| 967 | last_dev = inode->i_sb->s_dev; |
| 968 | } |
| 969 | |
| 970 | dprintk("nfsd: write complete err=%d\n", err); |
| 971 | if (err >= 0) |
| 972 | err = 0; |
| 973 | else |
| 974 | err = nfserrno(err); |
| 975 | out: |
| 976 | return err; |
| 977 | } |
| 978 | |
| 979 | /* |
| 980 | * Read data from a file. count must contain the requested read count |
| 981 | * on entry. On return, *count contains the number of bytes actually read. |
| 982 | * N.B. After this call fhp needs an fh_put |
| 983 | */ |
| 984 | int |
| 985 | nfsd_read(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file, |
| 986 | loff_t offset, struct kvec *vec, int vlen, |
| 987 | unsigned long *count) |
| 988 | { |
| 989 | int err; |
| 990 | |
| 991 | if (file) { |
| 992 | err = nfsd_permission(fhp->fh_export, fhp->fh_dentry, |
| 993 | MAY_READ|MAY_OWNER_OVERRIDE); |
| 994 | if (err) |
| 995 | goto out; |
| 996 | err = nfsd_vfs_read(rqstp, fhp, file, offset, vec, vlen, count); |
| 997 | } else { |
| 998 | err = nfsd_open(rqstp, fhp, S_IFREG, MAY_READ, &file); |
| 999 | if (err) |
| 1000 | goto out; |
| 1001 | err = nfsd_vfs_read(rqstp, fhp, file, offset, vec, vlen, count); |
| 1002 | nfsd_close(file); |
| 1003 | } |
| 1004 | out: |
| 1005 | return err; |
| 1006 | } |
| 1007 | |
| 1008 | /* |
| 1009 | * Write data to a file. |
| 1010 | * The stable flag requests synchronous writes. |
| 1011 | * N.B. After this call fhp needs an fh_put |
| 1012 | */ |
| 1013 | int |
| 1014 | nfsd_write(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file, |
| 1015 | loff_t offset, struct kvec *vec, int vlen, unsigned long cnt, |
| 1016 | int *stablep) |
| 1017 | { |
| 1018 | int err = 0; |
| 1019 | |
| 1020 | if (file) { |
| 1021 | err = nfsd_permission(fhp->fh_export, fhp->fh_dentry, |
| 1022 | MAY_WRITE|MAY_OWNER_OVERRIDE); |
| 1023 | if (err) |
| 1024 | goto out; |
| 1025 | err = nfsd_vfs_write(rqstp, fhp, file, offset, vec, vlen, cnt, |
| 1026 | stablep); |
| 1027 | } else { |
| 1028 | err = nfsd_open(rqstp, fhp, S_IFREG, MAY_WRITE, &file); |
| 1029 | if (err) |
| 1030 | goto out; |
| 1031 | |
| 1032 | if (cnt) |
| 1033 | err = nfsd_vfs_write(rqstp, fhp, file, offset, vec, vlen, |
| 1034 | cnt, stablep); |
| 1035 | nfsd_close(file); |
| 1036 | } |
| 1037 | out: |
| 1038 | return err; |
| 1039 | } |
| 1040 | |
| 1041 | #ifdef CONFIG_NFSD_V3 |
| 1042 | /* |
| 1043 | * Commit all pending writes to stable storage. |
| 1044 | * Strictly speaking, we could sync just the indicated file region here, |
| 1045 | * but there's currently no way we can ask the VFS to do so. |
| 1046 | * |
| 1047 | * Unfortunately we cannot lock the file to make sure we return full WCC |
| 1048 | * data to the client, as locking happens lower down in the filesystem. |
| 1049 | */ |
| 1050 | int |
| 1051 | nfsd_commit(struct svc_rqst *rqstp, struct svc_fh *fhp, |
| 1052 | loff_t offset, unsigned long count) |
| 1053 | { |
| 1054 | struct file *file; |
| 1055 | int err; |
| 1056 | |
| 1057 | if ((u64)count > ~(u64)offset) |
| 1058 | return nfserr_inval; |
| 1059 | |
| 1060 | if ((err = nfsd_open(rqstp, fhp, S_IFREG, MAY_WRITE, &file)) != 0) |
| 1061 | return err; |
| 1062 | if (EX_ISSYNC(fhp->fh_export)) { |
| 1063 | if (file->f_op && file->f_op->fsync) { |
NeilBrown | 45bd3b3 | 2006-01-18 17:43:50 -0800 | [diff] [blame] | 1064 | err = nfserrno(nfsd_sync(file)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1065 | } else { |
| 1066 | err = nfserr_notsupp; |
| 1067 | } |
| 1068 | } |
| 1069 | |
| 1070 | nfsd_close(file); |
| 1071 | return err; |
| 1072 | } |
| 1073 | #endif /* CONFIG_NFSD_V3 */ |
| 1074 | |
| 1075 | /* |
| 1076 | * Create a file (regular, directory, device, fifo); UNIX sockets |
| 1077 | * not yet implemented. |
| 1078 | * If the response fh has been verified, the parent directory should |
| 1079 | * already be locked. Note that the parent directory is left locked. |
| 1080 | * |
| 1081 | * N.B. Every call to nfsd_create needs an fh_put for _both_ fhp and resfhp |
| 1082 | */ |
| 1083 | int |
| 1084 | nfsd_create(struct svc_rqst *rqstp, struct svc_fh *fhp, |
| 1085 | char *fname, int flen, struct iattr *iap, |
| 1086 | int type, dev_t rdev, struct svc_fh *resfhp) |
| 1087 | { |
| 1088 | struct dentry *dentry, *dchild = NULL; |
| 1089 | struct inode *dirp; |
| 1090 | int err; |
| 1091 | |
| 1092 | err = nfserr_perm; |
| 1093 | if (!flen) |
| 1094 | goto out; |
| 1095 | err = nfserr_exist; |
| 1096 | if (isdotent(fname, flen)) |
| 1097 | goto out; |
| 1098 | |
| 1099 | err = fh_verify(rqstp, fhp, S_IFDIR, MAY_CREATE); |
| 1100 | if (err) |
| 1101 | goto out; |
| 1102 | |
| 1103 | dentry = fhp->fh_dentry; |
| 1104 | dirp = dentry->d_inode; |
| 1105 | |
| 1106 | err = nfserr_notdir; |
| 1107 | if(!dirp->i_op || !dirp->i_op->lookup) |
| 1108 | goto out; |
| 1109 | /* |
| 1110 | * Check whether the response file handle has been verified yet. |
| 1111 | * If it has, the parent directory should already be locked. |
| 1112 | */ |
| 1113 | if (!resfhp->fh_dentry) { |
| 1114 | /* called from nfsd_proc_mkdir, or possibly nfsd3_proc_create */ |
| 1115 | fh_lock(fhp); |
| 1116 | dchild = lookup_one_len(fname, dentry, flen); |
| 1117 | err = PTR_ERR(dchild); |
| 1118 | if (IS_ERR(dchild)) |
| 1119 | goto out_nfserr; |
| 1120 | err = fh_compose(resfhp, fhp->fh_export, dchild, fhp); |
| 1121 | if (err) |
| 1122 | goto out; |
| 1123 | } else { |
| 1124 | /* called from nfsd_proc_create */ |
| 1125 | dchild = dget(resfhp->fh_dentry); |
| 1126 | if (!fhp->fh_locked) { |
| 1127 | /* not actually possible */ |
| 1128 | printk(KERN_ERR |
| 1129 | "nfsd_create: parent %s/%s not locked!\n", |
| 1130 | dentry->d_parent->d_name.name, |
| 1131 | dentry->d_name.name); |
Al Viro | d75f2b9 | 2006-01-18 17:43:44 -0800 | [diff] [blame] | 1132 | err = nfserr_io; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1133 | goto out; |
| 1134 | } |
| 1135 | } |
| 1136 | /* |
| 1137 | * Make sure the child dentry is still negative ... |
| 1138 | */ |
| 1139 | err = nfserr_exist; |
| 1140 | if (dchild->d_inode) { |
| 1141 | dprintk("nfsd_create: dentry %s/%s not negative!\n", |
| 1142 | dentry->d_name.name, dchild->d_name.name); |
| 1143 | goto out; |
| 1144 | } |
| 1145 | |
| 1146 | if (!(iap->ia_valid & ATTR_MODE)) |
| 1147 | iap->ia_mode = 0; |
| 1148 | iap->ia_mode = (iap->ia_mode & S_IALLUGO) | type; |
| 1149 | |
| 1150 | /* |
| 1151 | * Get the dir op function pointer. |
| 1152 | */ |
| 1153 | err = nfserr_perm; |
| 1154 | switch (type) { |
| 1155 | case S_IFREG: |
| 1156 | err = vfs_create(dirp, dchild, iap->ia_mode, NULL); |
| 1157 | break; |
| 1158 | case S_IFDIR: |
| 1159 | err = vfs_mkdir(dirp, dchild, iap->ia_mode); |
| 1160 | break; |
| 1161 | case S_IFCHR: |
| 1162 | case S_IFBLK: |
| 1163 | case S_IFIFO: |
| 1164 | case S_IFSOCK: |
| 1165 | err = vfs_mknod(dirp, dchild, iap->ia_mode, rdev); |
| 1166 | break; |
| 1167 | default: |
| 1168 | printk("nfsd: bad file type %o in nfsd_create\n", type); |
| 1169 | err = -EINVAL; |
| 1170 | } |
| 1171 | if (err < 0) |
| 1172 | goto out_nfserr; |
| 1173 | |
| 1174 | if (EX_ISSYNC(fhp->fh_export)) { |
NeilBrown | 45bd3b3 | 2006-01-18 17:43:50 -0800 | [diff] [blame] | 1175 | err = nfserrno(nfsd_sync_dir(dentry)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1176 | write_inode_now(dchild->d_inode, 1); |
| 1177 | } |
| 1178 | |
| 1179 | |
| 1180 | /* Set file attributes. Mode has already been set and |
| 1181 | * setting uid/gid works only for root. Irix appears to |
| 1182 | * send along the gid when it tries to implement setgid |
| 1183 | * directories via NFS. |
| 1184 | */ |
YAMAMOTO Takashi | f193fba | 2006-01-18 17:43:13 -0800 | [diff] [blame] | 1185 | if ((iap->ia_valid &= ~(ATTR_UID|ATTR_GID|ATTR_MODE)) != 0) { |
| 1186 | int err2 = nfsd_setattr(rqstp, resfhp, iap, 0, (time_t)0); |
| 1187 | if (err2) |
| 1188 | err = err2; |
| 1189 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1190 | /* |
| 1191 | * Update the file handle to get the new inode info. |
| 1192 | */ |
| 1193 | if (!err) |
| 1194 | err = fh_update(resfhp); |
| 1195 | out: |
| 1196 | if (dchild && !IS_ERR(dchild)) |
| 1197 | dput(dchild); |
| 1198 | return err; |
| 1199 | |
| 1200 | out_nfserr: |
| 1201 | err = nfserrno(err); |
| 1202 | goto out; |
| 1203 | } |
| 1204 | |
| 1205 | #ifdef CONFIG_NFSD_V3 |
| 1206 | /* |
| 1207 | * NFSv3 version of nfsd_create |
| 1208 | */ |
| 1209 | int |
| 1210 | nfsd_create_v3(struct svc_rqst *rqstp, struct svc_fh *fhp, |
| 1211 | char *fname, int flen, struct iattr *iap, |
| 1212 | struct svc_fh *resfhp, int createmode, u32 *verifier, |
| 1213 | int *truncp) |
| 1214 | { |
| 1215 | struct dentry *dentry, *dchild = NULL; |
| 1216 | struct inode *dirp; |
| 1217 | int err; |
| 1218 | __u32 v_mtime=0, v_atime=0; |
| 1219 | int v_mode=0; |
| 1220 | |
| 1221 | err = nfserr_perm; |
| 1222 | if (!flen) |
| 1223 | goto out; |
| 1224 | err = nfserr_exist; |
| 1225 | if (isdotent(fname, flen)) |
| 1226 | goto out; |
| 1227 | if (!(iap->ia_valid & ATTR_MODE)) |
| 1228 | iap->ia_mode = 0; |
| 1229 | err = fh_verify(rqstp, fhp, S_IFDIR, MAY_CREATE); |
| 1230 | if (err) |
| 1231 | goto out; |
| 1232 | |
| 1233 | dentry = fhp->fh_dentry; |
| 1234 | dirp = dentry->d_inode; |
| 1235 | |
| 1236 | /* Get all the sanity checks out of the way before |
| 1237 | * we lock the parent. */ |
| 1238 | err = nfserr_notdir; |
| 1239 | if(!dirp->i_op || !dirp->i_op->lookup) |
| 1240 | goto out; |
| 1241 | fh_lock(fhp); |
| 1242 | |
| 1243 | /* |
| 1244 | * Compose the response file handle. |
| 1245 | */ |
| 1246 | dchild = lookup_one_len(fname, dentry, flen); |
| 1247 | err = PTR_ERR(dchild); |
| 1248 | if (IS_ERR(dchild)) |
| 1249 | goto out_nfserr; |
| 1250 | |
| 1251 | err = fh_compose(resfhp, fhp->fh_export, dchild, fhp); |
| 1252 | if (err) |
| 1253 | goto out; |
| 1254 | |
| 1255 | if (createmode == NFS3_CREATE_EXCLUSIVE) { |
| 1256 | /* while the verifier would fit in mtime+atime, |
| 1257 | * solaris7 gets confused (bugid 4218508) if these have |
| 1258 | * the high bit set, so we use the mode as well |
| 1259 | */ |
| 1260 | v_mtime = verifier[0]&0x7fffffff; |
| 1261 | v_atime = verifier[1]&0x7fffffff; |
| 1262 | v_mode = S_IFREG |
| 1263 | | ((verifier[0]&0x80000000) >> (32-7)) /* u+x */ |
| 1264 | | ((verifier[1]&0x80000000) >> (32-9)) /* u+r */ |
| 1265 | ; |
| 1266 | } |
| 1267 | |
| 1268 | if (dchild->d_inode) { |
| 1269 | err = 0; |
| 1270 | |
| 1271 | switch (createmode) { |
| 1272 | case NFS3_CREATE_UNCHECKED: |
| 1273 | if (! S_ISREG(dchild->d_inode->i_mode)) |
| 1274 | err = nfserr_exist; |
| 1275 | else if (truncp) { |
| 1276 | /* in nfsv4, we need to treat this case a little |
| 1277 | * differently. we don't want to truncate the |
| 1278 | * file now; this would be wrong if the OPEN |
| 1279 | * fails for some other reason. furthermore, |
| 1280 | * if the size is nonzero, we should ignore it |
| 1281 | * according to spec! |
| 1282 | */ |
| 1283 | *truncp = (iap->ia_valid & ATTR_SIZE) && !iap->ia_size; |
| 1284 | } |
| 1285 | else { |
| 1286 | iap->ia_valid &= ATTR_SIZE; |
| 1287 | goto set_attr; |
| 1288 | } |
| 1289 | break; |
| 1290 | case NFS3_CREATE_EXCLUSIVE: |
| 1291 | if ( dchild->d_inode->i_mtime.tv_sec == v_mtime |
| 1292 | && dchild->d_inode->i_atime.tv_sec == v_atime |
| 1293 | && dchild->d_inode->i_mode == v_mode |
| 1294 | && dchild->d_inode->i_size == 0 ) |
| 1295 | break; |
| 1296 | /* fallthru */ |
| 1297 | case NFS3_CREATE_GUARDED: |
| 1298 | err = nfserr_exist; |
| 1299 | } |
| 1300 | goto out; |
| 1301 | } |
| 1302 | |
| 1303 | err = vfs_create(dirp, dchild, iap->ia_mode, NULL); |
| 1304 | if (err < 0) |
| 1305 | goto out_nfserr; |
| 1306 | |
| 1307 | if (EX_ISSYNC(fhp->fh_export)) { |
NeilBrown | 45bd3b3 | 2006-01-18 17:43:50 -0800 | [diff] [blame] | 1308 | err = nfserrno(nfsd_sync_dir(dentry)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1309 | /* setattr will sync the child (or not) */ |
| 1310 | } |
| 1311 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1312 | if (createmode == NFS3_CREATE_EXCLUSIVE) { |
| 1313 | /* Cram the verifier into atime/mtime/mode */ |
| 1314 | iap->ia_valid = ATTR_MTIME|ATTR_ATIME |
| 1315 | | ATTR_MTIME_SET|ATTR_ATIME_SET |
| 1316 | | ATTR_MODE; |
| 1317 | /* XXX someone who knows this better please fix it for nsec */ |
| 1318 | iap->ia_mtime.tv_sec = v_mtime; |
| 1319 | iap->ia_atime.tv_sec = v_atime; |
| 1320 | iap->ia_mtime.tv_nsec = 0; |
| 1321 | iap->ia_atime.tv_nsec = 0; |
| 1322 | iap->ia_mode = v_mode; |
| 1323 | } |
| 1324 | |
| 1325 | /* Set file attributes. |
| 1326 | * Mode has already been set but we might need to reset it |
| 1327 | * for CREATE_EXCLUSIVE |
| 1328 | * Irix appears to send along the gid when it tries to |
| 1329 | * implement setgid directories via NFS. Clear out all that cruft. |
| 1330 | */ |
| 1331 | set_attr: |
YAMAMOTO Takashi | f193fba | 2006-01-18 17:43:13 -0800 | [diff] [blame] | 1332 | if ((iap->ia_valid &= ~(ATTR_UID|ATTR_GID)) != 0) { |
| 1333 | int err2 = nfsd_setattr(rqstp, resfhp, iap, 0, (time_t)0); |
| 1334 | if (err2) |
NeilBrown | 45bd3b3 | 2006-01-18 17:43:50 -0800 | [diff] [blame] | 1335 | err = err2; |
YAMAMOTO Takashi | f193fba | 2006-01-18 17:43:13 -0800 | [diff] [blame] | 1336 | } |
| 1337 | |
| 1338 | /* |
| 1339 | * Update the filehandle to get the new inode info. |
| 1340 | */ |
| 1341 | if (!err) |
| 1342 | err = fh_update(resfhp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1343 | |
| 1344 | out: |
| 1345 | fh_unlock(fhp); |
| 1346 | if (dchild && !IS_ERR(dchild)) |
| 1347 | dput(dchild); |
| 1348 | return err; |
| 1349 | |
| 1350 | out_nfserr: |
| 1351 | err = nfserrno(err); |
| 1352 | goto out; |
| 1353 | } |
| 1354 | #endif /* CONFIG_NFSD_V3 */ |
| 1355 | |
| 1356 | /* |
| 1357 | * Read a symlink. On entry, *lenp must contain the maximum path length that |
| 1358 | * fits into the buffer. On return, it contains the true length. |
| 1359 | * N.B. After this call fhp needs an fh_put |
| 1360 | */ |
| 1361 | int |
| 1362 | nfsd_readlink(struct svc_rqst *rqstp, struct svc_fh *fhp, char *buf, int *lenp) |
| 1363 | { |
| 1364 | struct dentry *dentry; |
| 1365 | struct inode *inode; |
| 1366 | mm_segment_t oldfs; |
| 1367 | int err; |
| 1368 | |
| 1369 | err = fh_verify(rqstp, fhp, S_IFLNK, MAY_NOP); |
| 1370 | if (err) |
| 1371 | goto out; |
| 1372 | |
| 1373 | dentry = fhp->fh_dentry; |
| 1374 | inode = dentry->d_inode; |
| 1375 | |
| 1376 | err = nfserr_inval; |
| 1377 | if (!inode->i_op || !inode->i_op->readlink) |
| 1378 | goto out; |
| 1379 | |
| 1380 | touch_atime(fhp->fh_export->ex_mnt, dentry); |
| 1381 | /* N.B. Why does this call need a get_fs()?? |
| 1382 | * Remove the set_fs and watch the fireworks:-) --okir |
| 1383 | */ |
| 1384 | |
| 1385 | oldfs = get_fs(); set_fs(KERNEL_DS); |
| 1386 | err = inode->i_op->readlink(dentry, buf, *lenp); |
| 1387 | set_fs(oldfs); |
| 1388 | |
| 1389 | if (err < 0) |
| 1390 | goto out_nfserr; |
| 1391 | *lenp = err; |
| 1392 | err = 0; |
| 1393 | out: |
| 1394 | return err; |
| 1395 | |
| 1396 | out_nfserr: |
| 1397 | err = nfserrno(err); |
| 1398 | goto out; |
| 1399 | } |
| 1400 | |
| 1401 | /* |
| 1402 | * Create a symlink and look up its inode |
| 1403 | * N.B. After this call _both_ fhp and resfhp need an fh_put |
| 1404 | */ |
| 1405 | int |
| 1406 | nfsd_symlink(struct svc_rqst *rqstp, struct svc_fh *fhp, |
| 1407 | char *fname, int flen, |
| 1408 | char *path, int plen, |
| 1409 | struct svc_fh *resfhp, |
| 1410 | struct iattr *iap) |
| 1411 | { |
| 1412 | struct dentry *dentry, *dnew; |
| 1413 | int err, cerr; |
| 1414 | umode_t mode; |
| 1415 | |
| 1416 | err = nfserr_noent; |
| 1417 | if (!flen || !plen) |
| 1418 | goto out; |
| 1419 | err = nfserr_exist; |
| 1420 | if (isdotent(fname, flen)) |
| 1421 | goto out; |
| 1422 | |
| 1423 | err = fh_verify(rqstp, fhp, S_IFDIR, MAY_CREATE); |
| 1424 | if (err) |
| 1425 | goto out; |
| 1426 | fh_lock(fhp); |
| 1427 | dentry = fhp->fh_dentry; |
| 1428 | dnew = lookup_one_len(fname, dentry, flen); |
| 1429 | err = PTR_ERR(dnew); |
| 1430 | if (IS_ERR(dnew)) |
| 1431 | goto out_nfserr; |
| 1432 | |
| 1433 | mode = S_IALLUGO; |
| 1434 | /* Only the MODE ATTRibute is even vaguely meaningful */ |
| 1435 | if (iap && (iap->ia_valid & ATTR_MODE)) |
| 1436 | mode = iap->ia_mode & S_IALLUGO; |
| 1437 | |
| 1438 | if (unlikely(path[plen] != 0)) { |
| 1439 | char *path_alloced = kmalloc(plen+1, GFP_KERNEL); |
| 1440 | if (path_alloced == NULL) |
| 1441 | err = -ENOMEM; |
| 1442 | else { |
| 1443 | strncpy(path_alloced, path, plen); |
| 1444 | path_alloced[plen] = 0; |
| 1445 | err = vfs_symlink(dentry->d_inode, dnew, path_alloced, mode); |
| 1446 | kfree(path_alloced); |
| 1447 | } |
| 1448 | } else |
| 1449 | err = vfs_symlink(dentry->d_inode, dnew, path, mode); |
| 1450 | |
YAMAMOTO Takashi | f193fba | 2006-01-18 17:43:13 -0800 | [diff] [blame] | 1451 | if (!err) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1452 | if (EX_ISSYNC(fhp->fh_export)) |
YAMAMOTO Takashi | f193fba | 2006-01-18 17:43:13 -0800 | [diff] [blame] | 1453 | err = nfsd_sync_dir(dentry); |
| 1454 | if (err) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1455 | err = nfserrno(err); |
| 1456 | fh_unlock(fhp); |
| 1457 | |
| 1458 | cerr = fh_compose(resfhp, fhp->fh_export, dnew, fhp); |
| 1459 | dput(dnew); |
| 1460 | if (err==0) err = cerr; |
| 1461 | out: |
| 1462 | return err; |
| 1463 | |
| 1464 | out_nfserr: |
| 1465 | err = nfserrno(err); |
| 1466 | goto out; |
| 1467 | } |
| 1468 | |
| 1469 | /* |
| 1470 | * Create a hardlink |
| 1471 | * N.B. After this call _both_ ffhp and tfhp need an fh_put |
| 1472 | */ |
| 1473 | int |
| 1474 | nfsd_link(struct svc_rqst *rqstp, struct svc_fh *ffhp, |
| 1475 | char *name, int len, struct svc_fh *tfhp) |
| 1476 | { |
| 1477 | struct dentry *ddir, *dnew, *dold; |
| 1478 | struct inode *dirp, *dest; |
| 1479 | int err; |
| 1480 | |
| 1481 | err = fh_verify(rqstp, ffhp, S_IFDIR, MAY_CREATE); |
| 1482 | if (err) |
| 1483 | goto out; |
| 1484 | err = fh_verify(rqstp, tfhp, -S_IFDIR, MAY_NOP); |
| 1485 | if (err) |
| 1486 | goto out; |
| 1487 | |
| 1488 | err = nfserr_perm; |
| 1489 | if (!len) |
| 1490 | goto out; |
| 1491 | err = nfserr_exist; |
| 1492 | if (isdotent(name, len)) |
| 1493 | goto out; |
| 1494 | |
| 1495 | fh_lock(ffhp); |
| 1496 | ddir = ffhp->fh_dentry; |
| 1497 | dirp = ddir->d_inode; |
| 1498 | |
| 1499 | dnew = lookup_one_len(name, ddir, len); |
| 1500 | err = PTR_ERR(dnew); |
| 1501 | if (IS_ERR(dnew)) |
| 1502 | goto out_nfserr; |
| 1503 | |
| 1504 | dold = tfhp->fh_dentry; |
| 1505 | dest = dold->d_inode; |
| 1506 | |
| 1507 | err = vfs_link(dold, dirp, dnew); |
| 1508 | if (!err) { |
| 1509 | if (EX_ISSYNC(ffhp->fh_export)) { |
NeilBrown | 45bd3b3 | 2006-01-18 17:43:50 -0800 | [diff] [blame] | 1510 | err = nfserrno(nfsd_sync_dir(ddir)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1511 | write_inode_now(dest, 1); |
| 1512 | } |
| 1513 | } else { |
| 1514 | if (err == -EXDEV && rqstp->rq_vers == 2) |
| 1515 | err = nfserr_acces; |
| 1516 | else |
| 1517 | err = nfserrno(err); |
| 1518 | } |
| 1519 | |
| 1520 | fh_unlock(ffhp); |
| 1521 | dput(dnew); |
| 1522 | out: |
| 1523 | return err; |
| 1524 | |
| 1525 | out_nfserr: |
| 1526 | err = nfserrno(err); |
| 1527 | goto out; |
| 1528 | } |
| 1529 | |
| 1530 | /* |
| 1531 | * Rename a file |
| 1532 | * N.B. After this call _both_ ffhp and tfhp need an fh_put |
| 1533 | */ |
| 1534 | int |
| 1535 | nfsd_rename(struct svc_rqst *rqstp, struct svc_fh *ffhp, char *fname, int flen, |
| 1536 | struct svc_fh *tfhp, char *tname, int tlen) |
| 1537 | { |
| 1538 | struct dentry *fdentry, *tdentry, *odentry, *ndentry, *trap; |
| 1539 | struct inode *fdir, *tdir; |
| 1540 | int err; |
| 1541 | |
| 1542 | err = fh_verify(rqstp, ffhp, S_IFDIR, MAY_REMOVE); |
| 1543 | if (err) |
| 1544 | goto out; |
| 1545 | err = fh_verify(rqstp, tfhp, S_IFDIR, MAY_CREATE); |
| 1546 | if (err) |
| 1547 | goto out; |
| 1548 | |
| 1549 | fdentry = ffhp->fh_dentry; |
| 1550 | fdir = fdentry->d_inode; |
| 1551 | |
| 1552 | tdentry = tfhp->fh_dentry; |
| 1553 | tdir = tdentry->d_inode; |
| 1554 | |
| 1555 | err = (rqstp->rq_vers == 2) ? nfserr_acces : nfserr_xdev; |
| 1556 | if (fdir->i_sb != tdir->i_sb) |
| 1557 | goto out; |
| 1558 | |
| 1559 | err = nfserr_perm; |
| 1560 | if (!flen || isdotent(fname, flen) || !tlen || isdotent(tname, tlen)) |
| 1561 | goto out; |
| 1562 | |
| 1563 | /* cannot use fh_lock as we need deadlock protective ordering |
| 1564 | * so do it by hand */ |
| 1565 | trap = lock_rename(tdentry, fdentry); |
| 1566 | ffhp->fh_locked = tfhp->fh_locked = 1; |
| 1567 | fill_pre_wcc(ffhp); |
| 1568 | fill_pre_wcc(tfhp); |
| 1569 | |
| 1570 | odentry = lookup_one_len(fname, fdentry, flen); |
| 1571 | err = PTR_ERR(odentry); |
| 1572 | if (IS_ERR(odentry)) |
| 1573 | goto out_nfserr; |
| 1574 | |
| 1575 | err = -ENOENT; |
| 1576 | if (!odentry->d_inode) |
| 1577 | goto out_dput_old; |
| 1578 | err = -EINVAL; |
| 1579 | if (odentry == trap) |
| 1580 | goto out_dput_old; |
| 1581 | |
| 1582 | ndentry = lookup_one_len(tname, tdentry, tlen); |
| 1583 | err = PTR_ERR(ndentry); |
| 1584 | if (IS_ERR(ndentry)) |
| 1585 | goto out_dput_old; |
| 1586 | err = -ENOTEMPTY; |
| 1587 | if (ndentry == trap) |
| 1588 | goto out_dput_new; |
| 1589 | |
| 1590 | #ifdef MSNFS |
| 1591 | if ((ffhp->fh_export->ex_flags & NFSEXP_MSNFS) && |
| 1592 | ((atomic_read(&odentry->d_count) > 1) |
| 1593 | || (atomic_read(&ndentry->d_count) > 1))) { |
Al Viro | d75f2b9 | 2006-01-18 17:43:44 -0800 | [diff] [blame] | 1594 | err = -EPERM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1595 | } else |
| 1596 | #endif |
| 1597 | err = vfs_rename(fdir, odentry, tdir, ndentry); |
| 1598 | if (!err && EX_ISSYNC(tfhp->fh_export)) { |
YAMAMOTO Takashi | f193fba | 2006-01-18 17:43:13 -0800 | [diff] [blame] | 1599 | err = nfsd_sync_dir(tdentry); |
| 1600 | if (!err) |
| 1601 | err = nfsd_sync_dir(fdentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1602 | } |
| 1603 | |
| 1604 | out_dput_new: |
| 1605 | dput(ndentry); |
| 1606 | out_dput_old: |
| 1607 | dput(odentry); |
| 1608 | out_nfserr: |
| 1609 | if (err) |
| 1610 | err = nfserrno(err); |
| 1611 | |
| 1612 | /* we cannot reply on fh_unlock on the two filehandles, |
| 1613 | * as that would do the wrong thing if the two directories |
| 1614 | * were the same, so again we do it by hand |
| 1615 | */ |
| 1616 | fill_post_wcc(ffhp); |
| 1617 | fill_post_wcc(tfhp); |
| 1618 | unlock_rename(tdentry, fdentry); |
| 1619 | ffhp->fh_locked = tfhp->fh_locked = 0; |
| 1620 | |
| 1621 | out: |
| 1622 | return err; |
| 1623 | } |
| 1624 | |
| 1625 | /* |
| 1626 | * Unlink a file or directory |
| 1627 | * N.B. After this call fhp needs an fh_put |
| 1628 | */ |
| 1629 | int |
| 1630 | nfsd_unlink(struct svc_rqst *rqstp, struct svc_fh *fhp, int type, |
| 1631 | char *fname, int flen) |
| 1632 | { |
| 1633 | struct dentry *dentry, *rdentry; |
| 1634 | struct inode *dirp; |
| 1635 | int err; |
| 1636 | |
| 1637 | err = nfserr_acces; |
| 1638 | if (!flen || isdotent(fname, flen)) |
| 1639 | goto out; |
| 1640 | err = fh_verify(rqstp, fhp, S_IFDIR, MAY_REMOVE); |
| 1641 | if (err) |
| 1642 | goto out; |
| 1643 | |
| 1644 | fh_lock(fhp); |
| 1645 | dentry = fhp->fh_dentry; |
| 1646 | dirp = dentry->d_inode; |
| 1647 | |
| 1648 | rdentry = lookup_one_len(fname, dentry, flen); |
| 1649 | err = PTR_ERR(rdentry); |
| 1650 | if (IS_ERR(rdentry)) |
| 1651 | goto out_nfserr; |
| 1652 | |
| 1653 | if (!rdentry->d_inode) { |
| 1654 | dput(rdentry); |
| 1655 | err = nfserr_noent; |
| 1656 | goto out; |
| 1657 | } |
| 1658 | |
| 1659 | if (!type) |
| 1660 | type = rdentry->d_inode->i_mode & S_IFMT; |
| 1661 | |
| 1662 | if (type != S_IFDIR) { /* It's UNLINK */ |
| 1663 | #ifdef MSNFS |
| 1664 | if ((fhp->fh_export->ex_flags & NFSEXP_MSNFS) && |
| 1665 | (atomic_read(&rdentry->d_count) > 1)) { |
Al Viro | d75f2b9 | 2006-01-18 17:43:44 -0800 | [diff] [blame] | 1666 | err = -EPERM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1667 | } else |
| 1668 | #endif |
| 1669 | err = vfs_unlink(dirp, rdentry); |
| 1670 | } else { /* It's RMDIR */ |
| 1671 | err = vfs_rmdir(dirp, rdentry); |
| 1672 | } |
| 1673 | |
| 1674 | dput(rdentry); |
| 1675 | |
YAMAMOTO Takashi | f193fba | 2006-01-18 17:43:13 -0800 | [diff] [blame] | 1676 | if (err == 0 && |
| 1677 | EX_ISSYNC(fhp->fh_export)) |
| 1678 | err = nfsd_sync_dir(dentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1679 | |
| 1680 | out_nfserr: |
| 1681 | err = nfserrno(err); |
YAMAMOTO Takashi | f193fba | 2006-01-18 17:43:13 -0800 | [diff] [blame] | 1682 | out: |
| 1683 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1684 | } |
| 1685 | |
| 1686 | /* |
| 1687 | * Read entries from a directory. |
| 1688 | * The NFSv3/4 verifier we ignore for now. |
| 1689 | */ |
| 1690 | int |
| 1691 | nfsd_readdir(struct svc_rqst *rqstp, struct svc_fh *fhp, loff_t *offsetp, |
| 1692 | struct readdir_cd *cdp, encode_dent_fn func) |
| 1693 | { |
| 1694 | int err; |
| 1695 | struct file *file; |
| 1696 | loff_t offset = *offsetp; |
| 1697 | |
| 1698 | err = nfsd_open(rqstp, fhp, S_IFDIR, MAY_READ, &file); |
| 1699 | if (err) |
| 1700 | goto out; |
| 1701 | |
| 1702 | offset = vfs_llseek(file, offset, 0); |
| 1703 | if (offset < 0) { |
| 1704 | err = nfserrno((int)offset); |
| 1705 | goto out_close; |
| 1706 | } |
| 1707 | |
| 1708 | /* |
| 1709 | * Read the directory entries. This silly loop is necessary because |
| 1710 | * readdir() is not guaranteed to fill up the entire buffer, but |
| 1711 | * may choose to do less. |
| 1712 | */ |
| 1713 | |
| 1714 | do { |
| 1715 | cdp->err = nfserr_eof; /* will be cleared on successful read */ |
| 1716 | err = vfs_readdir(file, (filldir_t) func, cdp); |
| 1717 | } while (err >=0 && cdp->err == nfs_ok); |
| 1718 | if (err) |
| 1719 | err = nfserrno(err); |
| 1720 | else |
| 1721 | err = cdp->err; |
| 1722 | *offsetp = vfs_llseek(file, 0, 1); |
| 1723 | |
| 1724 | if (err == nfserr_eof || err == nfserr_toosmall) |
| 1725 | err = nfs_ok; /* can still be found in ->err */ |
| 1726 | out_close: |
| 1727 | nfsd_close(file); |
| 1728 | out: |
| 1729 | return err; |
| 1730 | } |
| 1731 | |
| 1732 | /* |
| 1733 | * Get file system stats |
| 1734 | * N.B. After this call fhp needs an fh_put |
| 1735 | */ |
| 1736 | int |
| 1737 | nfsd_statfs(struct svc_rqst *rqstp, struct svc_fh *fhp, struct kstatfs *stat) |
| 1738 | { |
| 1739 | int err = fh_verify(rqstp, fhp, 0, MAY_NOP); |
| 1740 | if (!err && vfs_statfs(fhp->fh_dentry->d_inode->i_sb,stat)) |
| 1741 | err = nfserr_io; |
| 1742 | return err; |
| 1743 | } |
| 1744 | |
| 1745 | /* |
| 1746 | * Check for a user's access permissions to this inode. |
| 1747 | */ |
| 1748 | int |
| 1749 | nfsd_permission(struct svc_export *exp, struct dentry *dentry, int acc) |
| 1750 | { |
| 1751 | struct inode *inode = dentry->d_inode; |
| 1752 | int err; |
| 1753 | |
| 1754 | if (acc == MAY_NOP) |
| 1755 | return 0; |
| 1756 | #if 0 |
| 1757 | dprintk("nfsd: permission 0x%x%s%s%s%s%s%s%s mode 0%o%s%s%s\n", |
| 1758 | acc, |
| 1759 | (acc & MAY_READ)? " read" : "", |
| 1760 | (acc & MAY_WRITE)? " write" : "", |
| 1761 | (acc & MAY_EXEC)? " exec" : "", |
| 1762 | (acc & MAY_SATTR)? " sattr" : "", |
| 1763 | (acc & MAY_TRUNC)? " trunc" : "", |
| 1764 | (acc & MAY_LOCK)? " lock" : "", |
| 1765 | (acc & MAY_OWNER_OVERRIDE)? " owneroverride" : "", |
| 1766 | inode->i_mode, |
| 1767 | IS_IMMUTABLE(inode)? " immut" : "", |
| 1768 | IS_APPEND(inode)? " append" : "", |
| 1769 | IS_RDONLY(inode)? " ro" : ""); |
| 1770 | dprintk(" owner %d/%d user %d/%d\n", |
| 1771 | inode->i_uid, inode->i_gid, current->fsuid, current->fsgid); |
| 1772 | #endif |
| 1773 | |
| 1774 | /* Normally we reject any write/sattr etc access on a read-only file |
| 1775 | * system. But if it is IRIX doing check on write-access for a |
| 1776 | * device special file, we ignore rofs. |
| 1777 | */ |
| 1778 | if (!(acc & MAY_LOCAL_ACCESS)) |
| 1779 | if (acc & (MAY_WRITE | MAY_SATTR | MAY_TRUNC)) { |
| 1780 | if (EX_RDONLY(exp) || IS_RDONLY(inode)) |
| 1781 | return nfserr_rofs; |
| 1782 | if (/* (acc & MAY_WRITE) && */ IS_IMMUTABLE(inode)) |
| 1783 | return nfserr_perm; |
| 1784 | } |
| 1785 | if ((acc & MAY_TRUNC) && IS_APPEND(inode)) |
| 1786 | return nfserr_perm; |
| 1787 | |
| 1788 | if (acc & MAY_LOCK) { |
| 1789 | /* If we cannot rely on authentication in NLM requests, |
| 1790 | * just allow locks, otherwise require read permission, or |
| 1791 | * ownership |
| 1792 | */ |
| 1793 | if (exp->ex_flags & NFSEXP_NOAUTHNLM) |
| 1794 | return 0; |
| 1795 | else |
| 1796 | acc = MAY_READ | MAY_OWNER_OVERRIDE; |
| 1797 | } |
| 1798 | /* |
| 1799 | * The file owner always gets access permission for accesses that |
| 1800 | * would normally be checked at open time. This is to make |
| 1801 | * file access work even when the client has done a fchmod(fd, 0). |
| 1802 | * |
| 1803 | * However, `cp foo bar' should fail nevertheless when bar is |
| 1804 | * readonly. A sensible way to do this might be to reject all |
| 1805 | * attempts to truncate a read-only file, because a creat() call |
| 1806 | * always implies file truncation. |
| 1807 | * ... but this isn't really fair. A process may reasonably call |
| 1808 | * ftruncate on an open file descriptor on a file with perm 000. |
| 1809 | * We must trust the client to do permission checking - using "ACCESS" |
| 1810 | * with NFSv3. |
| 1811 | */ |
| 1812 | if ((acc & MAY_OWNER_OVERRIDE) && |
| 1813 | inode->i_uid == current->fsuid) |
| 1814 | return 0; |
| 1815 | |
| 1816 | err = permission(inode, acc & (MAY_READ|MAY_WRITE|MAY_EXEC), NULL); |
| 1817 | |
| 1818 | /* Allow read access to binaries even when mode 111 */ |
| 1819 | if (err == -EACCES && S_ISREG(inode->i_mode) && |
| 1820 | acc == (MAY_READ | MAY_OWNER_OVERRIDE)) |
| 1821 | err = permission(inode, MAY_EXEC, NULL); |
| 1822 | |
| 1823 | return err? nfserrno(err) : 0; |
| 1824 | } |
| 1825 | |
| 1826 | void |
| 1827 | nfsd_racache_shutdown(void) |
| 1828 | { |
| 1829 | if (!raparm_cache) |
| 1830 | return; |
| 1831 | dprintk("nfsd: freeing readahead buffers.\n"); |
| 1832 | kfree(raparml); |
| 1833 | raparm_cache = raparml = NULL; |
| 1834 | } |
| 1835 | /* |
| 1836 | * Initialize readahead param cache |
| 1837 | */ |
| 1838 | int |
| 1839 | nfsd_racache_init(int cache_size) |
| 1840 | { |
| 1841 | int i; |
| 1842 | |
| 1843 | if (raparm_cache) |
| 1844 | return 0; |
| 1845 | raparml = kmalloc(sizeof(struct raparms) * cache_size, GFP_KERNEL); |
| 1846 | |
| 1847 | if (raparml != NULL) { |
| 1848 | dprintk("nfsd: allocating %d readahead buffers.\n", |
| 1849 | cache_size); |
| 1850 | memset(raparml, 0, sizeof(struct raparms) * cache_size); |
| 1851 | for (i = 0; i < cache_size - 1; i++) { |
| 1852 | raparml[i].p_next = raparml + i + 1; |
| 1853 | } |
| 1854 | raparm_cache = raparml; |
| 1855 | } else { |
| 1856 | printk(KERN_WARNING |
| 1857 | "nfsd: Could not allocate memory read-ahead cache.\n"); |
| 1858 | return -ENOMEM; |
| 1859 | } |
| 1860 | nfsdstats.ra_size = cache_size; |
| 1861 | return 0; |
| 1862 | } |
Andreas Gruenbacher | a257cdd | 2005-06-22 17:16:26 +0000 | [diff] [blame] | 1863 | |
| 1864 | #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) |
| 1865 | struct posix_acl * |
| 1866 | nfsd_get_posix_acl(struct svc_fh *fhp, int type) |
| 1867 | { |
| 1868 | struct inode *inode = fhp->fh_dentry->d_inode; |
| 1869 | char *name; |
| 1870 | void *value = NULL; |
| 1871 | ssize_t size; |
| 1872 | struct posix_acl *acl; |
| 1873 | |
Christoph Hellwig | 5be196e | 2006-01-09 20:51:55 -0800 | [diff] [blame] | 1874 | if (!IS_POSIXACL(inode)) |
Andreas Gruenbacher | a257cdd | 2005-06-22 17:16:26 +0000 | [diff] [blame] | 1875 | return ERR_PTR(-EOPNOTSUPP); |
Christoph Hellwig | 5be196e | 2006-01-09 20:51:55 -0800 | [diff] [blame] | 1876 | |
| 1877 | switch (type) { |
| 1878 | case ACL_TYPE_ACCESS: |
| 1879 | name = POSIX_ACL_XATTR_ACCESS; |
| 1880 | break; |
| 1881 | case ACL_TYPE_DEFAULT: |
| 1882 | name = POSIX_ACL_XATTR_DEFAULT; |
| 1883 | break; |
| 1884 | default: |
| 1885 | return ERR_PTR(-EOPNOTSUPP); |
Andreas Gruenbacher | a257cdd | 2005-06-22 17:16:26 +0000 | [diff] [blame] | 1886 | } |
| 1887 | |
Christoph Hellwig | 5be196e | 2006-01-09 20:51:55 -0800 | [diff] [blame] | 1888 | size = nfsd_getxattr(fhp->fh_dentry, name, &value); |
| 1889 | if (size < 0) |
| 1890 | return ERR_PTR(size); |
Andreas Gruenbacher | a257cdd | 2005-06-22 17:16:26 +0000 | [diff] [blame] | 1891 | |
Andreas Gruenbacher | a257cdd | 2005-06-22 17:16:26 +0000 | [diff] [blame] | 1892 | acl = posix_acl_from_xattr(value, size); |
Andreas Gruenbacher | a257cdd | 2005-06-22 17:16:26 +0000 | [diff] [blame] | 1893 | kfree(value); |
| 1894 | return acl; |
| 1895 | } |
| 1896 | |
| 1897 | int |
| 1898 | nfsd_set_posix_acl(struct svc_fh *fhp, int type, struct posix_acl *acl) |
| 1899 | { |
| 1900 | struct inode *inode = fhp->fh_dentry->d_inode; |
| 1901 | char *name; |
| 1902 | void *value = NULL; |
| 1903 | size_t size; |
| 1904 | int error; |
| 1905 | |
| 1906 | if (!IS_POSIXACL(inode) || !inode->i_op || |
| 1907 | !inode->i_op->setxattr || !inode->i_op->removexattr) |
| 1908 | return -EOPNOTSUPP; |
| 1909 | switch(type) { |
| 1910 | case ACL_TYPE_ACCESS: |
Christoph Hellwig | 334a13e | 2005-06-28 20:44:58 -0700 | [diff] [blame] | 1911 | name = POSIX_ACL_XATTR_ACCESS; |
Andreas Gruenbacher | a257cdd | 2005-06-22 17:16:26 +0000 | [diff] [blame] | 1912 | break; |
| 1913 | case ACL_TYPE_DEFAULT: |
Christoph Hellwig | 334a13e | 2005-06-28 20:44:58 -0700 | [diff] [blame] | 1914 | name = POSIX_ACL_XATTR_DEFAULT; |
Andreas Gruenbacher | a257cdd | 2005-06-22 17:16:26 +0000 | [diff] [blame] | 1915 | break; |
| 1916 | default: |
| 1917 | return -EOPNOTSUPP; |
| 1918 | } |
| 1919 | |
| 1920 | if (acl && acl->a_count) { |
Christoph Hellwig | 334a13e | 2005-06-28 20:44:58 -0700 | [diff] [blame] | 1921 | size = posix_acl_xattr_size(acl->a_count); |
Andreas Gruenbacher | a257cdd | 2005-06-22 17:16:26 +0000 | [diff] [blame] | 1922 | value = kmalloc(size, GFP_KERNEL); |
| 1923 | if (!value) |
| 1924 | return -ENOMEM; |
Florin Malita | 9ccfc29 | 2006-05-20 14:59:58 -0700 | [diff] [blame] | 1925 | error = posix_acl_to_xattr(acl, value, size); |
| 1926 | if (error < 0) |
Andreas Gruenbacher | a257cdd | 2005-06-22 17:16:26 +0000 | [diff] [blame] | 1927 | goto getout; |
Florin Malita | 9ccfc29 | 2006-05-20 14:59:58 -0700 | [diff] [blame] | 1928 | size = error; |
Andreas Gruenbacher | a257cdd | 2005-06-22 17:16:26 +0000 | [diff] [blame] | 1929 | } else |
| 1930 | size = 0; |
| 1931 | |
Andreas Gruenbacher | a257cdd | 2005-06-22 17:16:26 +0000 | [diff] [blame] | 1932 | if (size) |
Christoph Hellwig | 5be196e | 2006-01-09 20:51:55 -0800 | [diff] [blame] | 1933 | error = vfs_setxattr(fhp->fh_dentry, name, value, size, 0); |
Andreas Gruenbacher | a257cdd | 2005-06-22 17:16:26 +0000 | [diff] [blame] | 1934 | else { |
| 1935 | if (!S_ISDIR(inode->i_mode) && type == ACL_TYPE_DEFAULT) |
| 1936 | error = 0; |
| 1937 | else { |
Christoph Hellwig | 5be196e | 2006-01-09 20:51:55 -0800 | [diff] [blame] | 1938 | error = vfs_removexattr(fhp->fh_dentry, name); |
Andreas Gruenbacher | a257cdd | 2005-06-22 17:16:26 +0000 | [diff] [blame] | 1939 | if (error == -ENODATA) |
| 1940 | error = 0; |
| 1941 | } |
| 1942 | } |
| 1943 | |
| 1944 | getout: |
| 1945 | kfree(value); |
| 1946 | return error; |
| 1947 | } |
| 1948 | #endif /* defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) */ |