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 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 19 | #include <linux/string.h> |
| 20 | #include <linux/time.h> |
| 21 | #include <linux/errno.h> |
| 22 | #include <linux/fs.h> |
| 23 | #include <linux/file.h> |
| 24 | #include <linux/mount.h> |
| 25 | #include <linux/major.h> |
Jens Axboe | d6b29d7 | 2007-06-04 09:59:47 +0200 | [diff] [blame] | 26 | #include <linux/splice.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 27 | #include <linux/proc_fs.h> |
| 28 | #include <linux/stat.h> |
| 29 | #include <linux/fcntl.h> |
| 30 | #include <linux/net.h> |
| 31 | #include <linux/unistd.h> |
| 32 | #include <linux/slab.h> |
| 33 | #include <linux/pagemap.h> |
| 34 | #include <linux/in.h> |
| 35 | #include <linux/module.h> |
| 36 | #include <linux/namei.h> |
| 37 | #include <linux/vfs.h> |
| 38 | #include <linux/delay.h> |
| 39 | #include <linux/sunrpc/svc.h> |
| 40 | #include <linux/nfsd/nfsd.h> |
| 41 | #ifdef CONFIG_NFSD_V3 |
| 42 | #include <linux/nfs3.h> |
| 43 | #include <linux/nfsd/xdr3.h> |
| 44 | #endif /* CONFIG_NFSD_V3 */ |
| 45 | #include <linux/nfsd/nfsfh.h> |
| 46 | #include <linux/quotaops.h> |
Robert Love | 0eeca28 | 2005-07-12 17:06:03 -0400 | [diff] [blame] | 47 | #include <linux/fsnotify.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 48 | #include <linux/posix_acl.h> |
| 49 | #include <linux/posix_acl_xattr.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 50 | #include <linux/xattr.h> |
Christoph Hellwig | 5be196e | 2006-01-09 20:51:55 -0800 | [diff] [blame] | 51 | #ifdef CONFIG_NFSD_V4 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 52 | #include <linux/nfs4.h> |
| 53 | #include <linux/nfs4_acl.h> |
| 54 | #include <linux/nfsd_idmap.h> |
| 55 | #include <linux/security.h> |
| 56 | #endif /* CONFIG_NFSD_V4 */ |
Greg Banks | fce1456 | 2006-10-04 02:15:49 -0700 | [diff] [blame] | 57 | #include <linux/jhash.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 58 | |
| 59 | #include <asm/uaccess.h> |
| 60 | |
| 61 | #define NFSDDBG_FACILITY NFSDDBG_FILEOP |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 62 | |
| 63 | |
| 64 | /* We must ignore files (but only files) which might have mandatory |
| 65 | * locks on them because there is no way to know if the accesser has |
| 66 | * the lock. |
| 67 | */ |
| 68 | #define IS_ISMNDLK(i) (S_ISREG((i)->i_mode) && MANDATORY_LOCK(i)) |
| 69 | |
| 70 | /* |
| 71 | * This is a cache of readahead params that help us choose the proper |
| 72 | * readahead strategy. Initially, we set all readahead parameters to 0 |
| 73 | * and let the VFS handle things. |
| 74 | * If you increase the number of cached files very much, you'll need to |
| 75 | * add a hash table here. |
| 76 | */ |
| 77 | struct raparms { |
| 78 | struct raparms *p_next; |
| 79 | unsigned int p_count; |
| 80 | ino_t p_ino; |
| 81 | dev_t p_dev; |
| 82 | int p_set; |
| 83 | struct file_ra_state p_ra; |
Greg Banks | fce1456 | 2006-10-04 02:15:49 -0700 | [diff] [blame] | 84 | unsigned int p_hindex; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 85 | }; |
| 86 | |
Greg Banks | fce1456 | 2006-10-04 02:15:49 -0700 | [diff] [blame] | 87 | struct raparm_hbucket { |
| 88 | struct raparms *pb_head; |
| 89 | spinlock_t pb_lock; |
| 90 | } ____cacheline_aligned_in_smp; |
| 91 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 92 | static struct raparms * raparml; |
Greg Banks | fce1456 | 2006-10-04 02:15:49 -0700 | [diff] [blame] | 93 | #define RAPARM_HASH_BITS 4 |
| 94 | #define RAPARM_HASH_SIZE (1<<RAPARM_HASH_BITS) |
| 95 | #define RAPARM_HASH_MASK (RAPARM_HASH_SIZE-1) |
| 96 | static struct raparm_hbucket raparm_hash[RAPARM_HASH_SIZE]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 97 | |
| 98 | /* |
| 99 | * Called from nfsd_lookup and encode_dirent. Check if we have crossed |
| 100 | * a mount point. |
J.Bruce Fields | e0bb89e | 2006-12-13 00:35:25 -0800 | [diff] [blame] | 101 | * Returns -EAGAIN or -ETIMEDOUT leaving *dpp and *expp unchanged, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 102 | * or nfs_ok having possibly changed *dpp and *expp |
| 103 | */ |
| 104 | int |
| 105 | nfsd_cross_mnt(struct svc_rqst *rqstp, struct dentry **dpp, |
| 106 | struct svc_export **expp) |
| 107 | { |
| 108 | struct svc_export *exp = *expp, *exp2 = NULL; |
| 109 | struct dentry *dentry = *dpp; |
| 110 | struct vfsmount *mnt = mntget(exp->ex_mnt); |
| 111 | struct dentry *mounts = dget(dentry); |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 112 | int err = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 113 | |
| 114 | while (follow_down(&mnt,&mounts)&&d_mountpoint(mounts)); |
| 115 | |
J. Bruce Fields | 0989a78 | 2007-07-17 04:04:44 -0700 | [diff] [blame] | 116 | exp2 = rqst_exp_get_by_name(rqstp, mnt, mounts); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 117 | if (IS_ERR(exp2)) { |
Neil Brown | a1033be | 2007-09-05 17:22:12 -0400 | [diff] [blame] | 118 | if (PTR_ERR(exp2) != -ENOENT) |
| 119 | err = PTR_ERR(exp2); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 120 | dput(mounts); |
| 121 | mntput(mnt); |
| 122 | goto out; |
| 123 | } |
J. Bruce Fields | 5d3dbbe | 2007-07-19 01:49:19 -0700 | [diff] [blame] | 124 | if ((exp->ex_flags & NFSEXP_CROSSMOUNT) || EX_NOHIDE(exp2)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 125 | /* successfully crossed mount point */ |
| 126 | exp_put(exp); |
| 127 | *expp = exp2; |
| 128 | dput(dentry); |
| 129 | *dpp = mounts; |
| 130 | } else { |
J. Bruce Fields | 5d3dbbe | 2007-07-19 01:49:19 -0700 | [diff] [blame] | 131 | exp_put(exp2); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 132 | dput(mounts); |
| 133 | } |
| 134 | mntput(mnt); |
| 135 | out: |
| 136 | return err; |
| 137 | } |
| 138 | |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 139 | __be32 |
J. Bruce Fields | 6c0a654 | 2007-07-17 04:04:47 -0700 | [diff] [blame] | 140 | nfsd_lookup_dentry(struct svc_rqst *rqstp, struct svc_fh *fhp, |
| 141 | const char *name, int len, |
| 142 | struct svc_export **exp_ret, struct dentry **dentry_ret) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 143 | { |
| 144 | struct svc_export *exp; |
| 145 | struct dentry *dparent; |
| 146 | struct dentry *dentry; |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 147 | __be32 err; |
| 148 | int host_err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 149 | |
| 150 | dprintk("nfsd: nfsd_lookup(fh %s, %.*s)\n", SVCFH_fmt(fhp), len,name); |
| 151 | |
| 152 | /* Obtain dentry and export. */ |
| 153 | err = fh_verify(rqstp, fhp, S_IFDIR, MAY_EXEC); |
| 154 | if (err) |
| 155 | return err; |
| 156 | |
| 157 | dparent = fhp->fh_dentry; |
| 158 | exp = fhp->fh_export; |
| 159 | exp_get(exp); |
| 160 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 161 | /* Lookup the name, but don't follow links */ |
| 162 | if (isdotent(name, len)) { |
| 163 | if (len==1) |
| 164 | dentry = dget(dparent); |
| 165 | else if (dparent != exp->ex_dentry) { |
| 166 | dentry = dget_parent(dparent); |
| 167 | } else if (!EX_NOHIDE(exp)) |
| 168 | dentry = dget(dparent); /* .. == . just like at / */ |
| 169 | else { |
| 170 | /* checking mountpoint crossing is very different when stepping up */ |
| 171 | struct svc_export *exp2 = NULL; |
| 172 | struct dentry *dp; |
| 173 | struct vfsmount *mnt = mntget(exp->ex_mnt); |
| 174 | dentry = dget(dparent); |
| 175 | while(dentry == mnt->mnt_root && follow_up(&mnt, &dentry)) |
| 176 | ; |
| 177 | dp = dget_parent(dentry); |
| 178 | dput(dentry); |
| 179 | dentry = dp; |
| 180 | |
J. Bruce Fields | 0989a78 | 2007-07-17 04:04:44 -0700 | [diff] [blame] | 181 | exp2 = rqst_exp_parent(rqstp, mnt, dentry); |
J. Bruce Fields | 2d3bb25 | 2007-07-17 04:04:40 -0700 | [diff] [blame] | 182 | if (PTR_ERR(exp2) == -ENOENT) { |
| 183 | dput(dentry); |
| 184 | dentry = dget(dparent); |
| 185 | } else if (IS_ERR(exp2)) { |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 186 | host_err = PTR_ERR(exp2); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 187 | dput(dentry); |
| 188 | mntput(mnt); |
| 189 | goto out_nfserr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 190 | } else { |
| 191 | exp_put(exp); |
| 192 | exp = exp2; |
| 193 | } |
| 194 | mntput(mnt); |
| 195 | } |
| 196 | } else { |
| 197 | fh_lock(fhp); |
| 198 | dentry = lookup_one_len(name, dparent, len); |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 199 | host_err = PTR_ERR(dentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 200 | if (IS_ERR(dentry)) |
| 201 | goto out_nfserr; |
| 202 | /* |
| 203 | * check if we have crossed a mount point ... |
| 204 | */ |
| 205 | if (d_mountpoint(dentry)) { |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 206 | if ((host_err = nfsd_cross_mnt(rqstp, &dentry, &exp))) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 207 | dput(dentry); |
| 208 | goto out_nfserr; |
| 209 | } |
| 210 | } |
| 211 | } |
J. Bruce Fields | 6c0a654 | 2007-07-17 04:04:47 -0700 | [diff] [blame] | 212 | *dentry_ret = dentry; |
| 213 | *exp_ret = exp; |
| 214 | return 0; |
| 215 | |
| 216 | out_nfserr: |
| 217 | exp_put(exp); |
| 218 | return nfserrno(host_err); |
| 219 | } |
| 220 | |
| 221 | /* |
| 222 | * Look up one component of a pathname. |
| 223 | * N.B. After this call _both_ fhp and resfh need an fh_put |
| 224 | * |
| 225 | * If the lookup would cross a mountpoint, and the mounted filesystem |
| 226 | * is exported to the client with NFSEXP_NOHIDE, then the lookup is |
| 227 | * accepted as it stands and the mounted directory is |
| 228 | * returned. Otherwise the covered directory is returned. |
| 229 | * NOTE: this mountpoint crossing is not supported properly by all |
| 230 | * clients and is explicitly disallowed for NFSv3 |
| 231 | * NeilBrown <neilb@cse.unsw.edu.au> |
| 232 | */ |
| 233 | __be32 |
| 234 | nfsd_lookup(struct svc_rqst *rqstp, struct svc_fh *fhp, const char *name, |
| 235 | int len, struct svc_fh *resfh) |
| 236 | { |
| 237 | struct svc_export *exp; |
| 238 | struct dentry *dentry; |
| 239 | __be32 err; |
| 240 | |
| 241 | err = nfsd_lookup_dentry(rqstp, fhp, name, len, &exp, &dentry); |
| 242 | if (err) |
| 243 | return err; |
Andy Adamson | 32c1eb0 | 2007-07-17 04:04:48 -0700 | [diff] [blame] | 244 | err = check_nfsd_access(exp, rqstp); |
| 245 | if (err) |
| 246 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 247 | /* |
| 248 | * Note: we compose the file handle now, but as the |
| 249 | * dentry may be negative, it may need to be updated. |
| 250 | */ |
| 251 | err = fh_compose(resfh, exp, dentry, fhp); |
| 252 | if (!err && !dentry->d_inode) |
| 253 | err = nfserr_noent; |
Andy Adamson | 32c1eb0 | 2007-07-17 04:04:48 -0700 | [diff] [blame] | 254 | out: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 255 | dput(dentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 256 | exp_put(exp); |
| 257 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 258 | } |
| 259 | |
J. Bruce Fields | 6c0a654 | 2007-07-17 04:04:47 -0700 | [diff] [blame] | 260 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 261 | /* |
| 262 | * Set various file attributes. |
| 263 | * N.B. After this call fhp needs an fh_put |
| 264 | */ |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 265 | __be32 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 266 | nfsd_setattr(struct svc_rqst *rqstp, struct svc_fh *fhp, struct iattr *iap, |
| 267 | int check_guard, time_t guardtime) |
| 268 | { |
| 269 | struct dentry *dentry; |
| 270 | struct inode *inode; |
| 271 | int accmode = MAY_SATTR; |
| 272 | int ftype = 0; |
| 273 | int imode; |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 274 | __be32 err; |
| 275 | int host_err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 276 | int size_change = 0; |
| 277 | |
| 278 | if (iap->ia_valid & (ATTR_ATIME | ATTR_MTIME | ATTR_SIZE)) |
| 279 | accmode |= MAY_WRITE|MAY_OWNER_OVERRIDE; |
| 280 | if (iap->ia_valid & ATTR_SIZE) |
| 281 | ftype = S_IFREG; |
| 282 | |
| 283 | /* Get inode */ |
| 284 | err = fh_verify(rqstp, fhp, ftype, accmode); |
NeilBrown | 15b7a1b | 2005-11-07 01:00:23 -0800 | [diff] [blame] | 285 | if (err) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 286 | goto out; |
| 287 | |
| 288 | dentry = fhp->fh_dentry; |
| 289 | inode = dentry->d_inode; |
| 290 | |
NeilBrown | 15b7a1b | 2005-11-07 01:00:23 -0800 | [diff] [blame] | 291 | /* Ignore any mode updates on symlinks */ |
| 292 | if (S_ISLNK(inode->i_mode)) |
| 293 | iap->ia_valid &= ~ATTR_MODE; |
| 294 | |
| 295 | if (!iap->ia_valid) |
| 296 | goto out; |
| 297 | |
Christoph Hellwig | 9c85fca | 2007-03-07 15:26:25 +0000 | [diff] [blame] | 298 | /* |
| 299 | * NFSv2 does not differentiate between "set-[ac]time-to-now" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 300 | * which only requires access, and "set-[ac]time-to-X" which |
| 301 | * requires ownership. |
| 302 | * So if it looks like it might be "set both to the same time which |
| 303 | * is close to now", and if inode_change_ok fails, then we |
| 304 | * convert to "set to now" instead of "set to explicit time" |
| 305 | * |
| 306 | * We only call inode_change_ok as the last test as technically |
| 307 | * it is not an interface that we should be using. It is only |
| 308 | * valid if the filesystem does not define it's own i_op->setattr. |
| 309 | */ |
| 310 | #define BOTH_TIME_SET (ATTR_ATIME_SET | ATTR_MTIME_SET) |
| 311 | #define MAX_TOUCH_TIME_ERROR (30*60) |
Christoph Hellwig | 9c85fca | 2007-03-07 15:26:25 +0000 | [diff] [blame] | 312 | if ((iap->ia_valid & BOTH_TIME_SET) == BOTH_TIME_SET && |
| 313 | iap->ia_mtime.tv_sec == iap->ia_atime.tv_sec) { |
| 314 | /* |
| 315 | * Looks probable. |
| 316 | * |
| 317 | * Now just make sure time is in the right ballpark. |
| 318 | * Solaris, at least, doesn't seem to care what the time |
| 319 | * request is. We require it be within 30 minutes of now. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 320 | */ |
Christoph Hellwig | 9c85fca | 2007-03-07 15:26:25 +0000 | [diff] [blame] | 321 | time_t delta = iap->ia_atime.tv_sec - get_seconds(); |
| 322 | if (delta < 0) |
| 323 | delta = -delta; |
| 324 | if (delta < MAX_TOUCH_TIME_ERROR && |
| 325 | inode_change_ok(inode, iap) != 0) { |
| 326 | /* |
| 327 | * Turn off ATTR_[AM]TIME_SET but leave ATTR_[AM]TIME. |
| 328 | * This will cause notify_change to set these times |
| 329 | * to "now" |
| 330 | */ |
| 331 | iap->ia_valid &= ~BOTH_TIME_SET; |
| 332 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 333 | } |
| 334 | |
Christoph Hellwig | 9c85fca | 2007-03-07 15:26:25 +0000 | [diff] [blame] | 335 | /* |
| 336 | * The size case is special. |
| 337 | * It changes the file as well as the attributes. |
| 338 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 339 | if (iap->ia_valid & ATTR_SIZE) { |
| 340 | if (iap->ia_size < inode->i_size) { |
J. Bruce Fields | 0ec757d | 2007-07-17 04:04:48 -0700 | [diff] [blame] | 341 | err = nfsd_permission(rqstp, fhp->fh_export, dentry, MAY_TRUNC|MAY_OWNER_OVERRIDE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 342 | if (err) |
| 343 | goto out; |
| 344 | } |
| 345 | |
| 346 | /* |
| 347 | * If we are changing the size of the file, then |
| 348 | * we need to break all leases. |
| 349 | */ |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 350 | host_err = break_lease(inode, FMODE_WRITE | O_NONBLOCK); |
| 351 | if (host_err == -EWOULDBLOCK) |
| 352 | host_err = -ETIMEDOUT; |
| 353 | if (host_err) /* ENOMEM or EWOULDBLOCK */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 354 | goto out_nfserr; |
| 355 | |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 356 | host_err = get_write_access(inode); |
| 357 | if (host_err) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 358 | goto out_nfserr; |
| 359 | |
| 360 | size_change = 1; |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 361 | host_err = locks_verify_truncate(inode, NULL, iap->ia_size); |
| 362 | if (host_err) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 363 | put_write_access(inode); |
| 364 | goto out_nfserr; |
| 365 | } |
| 366 | DQUOT_INIT(inode); |
| 367 | } |
| 368 | |
| 369 | imode = inode->i_mode; |
| 370 | if (iap->ia_valid & ATTR_MODE) { |
| 371 | iap->ia_mode &= S_IALLUGO; |
| 372 | imode = iap->ia_mode |= (imode & ~S_IALLUGO); |
| 373 | } |
| 374 | |
| 375 | /* Revoke setuid/setgid bit on chown/chgrp */ |
| 376 | if ((iap->ia_valid & ATTR_UID) && iap->ia_uid != inode->i_uid) |
| 377 | iap->ia_valid |= ATTR_KILL_SUID; |
| 378 | if ((iap->ia_valid & ATTR_GID) && iap->ia_gid != inode->i_gid) |
| 379 | iap->ia_valid |= ATTR_KILL_SGID; |
| 380 | |
| 381 | /* Change the attributes. */ |
| 382 | |
| 383 | iap->ia_valid |= ATTR_CTIME; |
| 384 | |
| 385 | err = nfserr_notsync; |
| 386 | if (!check_guard || guardtime == inode->i_ctime.tv_sec) { |
| 387 | fh_lock(fhp); |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 388 | host_err = notify_change(dentry, iap); |
| 389 | err = nfserrno(host_err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 390 | fh_unlock(fhp); |
| 391 | } |
| 392 | if (size_change) |
| 393 | put_write_access(inode); |
| 394 | if (!err) |
| 395 | if (EX_ISSYNC(fhp->fh_export)) |
| 396 | write_inode_now(inode, 1); |
| 397 | out: |
| 398 | return err; |
| 399 | |
| 400 | out_nfserr: |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 401 | err = nfserrno(host_err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 402 | goto out; |
| 403 | } |
| 404 | |
Christoph Hellwig | 5be196e | 2006-01-09 20:51:55 -0800 | [diff] [blame] | 405 | #if defined(CONFIG_NFSD_V2_ACL) || \ |
| 406 | defined(CONFIG_NFSD_V3_ACL) || \ |
| 407 | defined(CONFIG_NFSD_V4) |
| 408 | static ssize_t nfsd_getxattr(struct dentry *dentry, char *key, void **buf) |
| 409 | { |
| 410 | ssize_t buflen; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 411 | |
Christoph Hellwig | 5be196e | 2006-01-09 20:51:55 -0800 | [diff] [blame] | 412 | buflen = vfs_getxattr(dentry, key, NULL, 0); |
| 413 | if (buflen <= 0) |
| 414 | return buflen; |
| 415 | |
| 416 | *buf = kmalloc(buflen, GFP_KERNEL); |
| 417 | if (!*buf) |
| 418 | return -ENOMEM; |
| 419 | |
NeilBrown | b5872b0 | 2006-04-10 22:55:26 -0700 | [diff] [blame] | 420 | return vfs_getxattr(dentry, key, *buf, buflen); |
Christoph Hellwig | 5be196e | 2006-01-09 20:51:55 -0800 | [diff] [blame] | 421 | } |
| 422 | #endif |
| 423 | |
| 424 | #if defined(CONFIG_NFSD_V4) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 425 | static int |
| 426 | set_nfsv4_acl_one(struct dentry *dentry, struct posix_acl *pacl, char *key) |
| 427 | { |
| 428 | int len; |
| 429 | size_t buflen; |
| 430 | char *buf = NULL; |
| 431 | int error = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 432 | |
| 433 | buflen = posix_acl_xattr_size(pacl->a_count); |
| 434 | buf = kmalloc(buflen, GFP_KERNEL); |
| 435 | error = -ENOMEM; |
| 436 | if (buf == NULL) |
| 437 | goto out; |
| 438 | |
| 439 | len = posix_acl_to_xattr(pacl, buf, buflen); |
| 440 | if (len < 0) { |
| 441 | error = len; |
| 442 | goto out; |
| 443 | } |
| 444 | |
Christoph Hellwig | 5be196e | 2006-01-09 20:51:55 -0800 | [diff] [blame] | 445 | error = vfs_setxattr(dentry, key, buf, len, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 446 | out: |
| 447 | kfree(buf); |
| 448 | return error; |
| 449 | } |
| 450 | |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 451 | __be32 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 452 | nfsd4_set_nfs4_acl(struct svc_rqst *rqstp, struct svc_fh *fhp, |
| 453 | struct nfs4_acl *acl) |
| 454 | { |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 455 | __be32 error; |
| 456 | int host_error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 457 | struct dentry *dentry; |
| 458 | struct inode *inode; |
| 459 | struct posix_acl *pacl = NULL, *dpacl = NULL; |
| 460 | unsigned int flags = 0; |
| 461 | |
| 462 | /* Get inode */ |
| 463 | error = fh_verify(rqstp, fhp, 0 /* S_IFREG */, MAY_SATTR); |
| 464 | if (error) |
J. Bruce Fields | 4b2ca38 | 2007-07-17 04:04:37 -0700 | [diff] [blame] | 465 | return error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 466 | |
| 467 | dentry = fhp->fh_dentry; |
| 468 | inode = dentry->d_inode; |
| 469 | if (S_ISDIR(inode->i_mode)) |
| 470 | flags = NFS4_ACL_DIR; |
| 471 | |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 472 | host_error = nfs4_acl_nfsv4_to_posix(acl, &pacl, &dpacl, flags); |
| 473 | if (host_error == -EINVAL) { |
J. Bruce Fields | 4b2ca38 | 2007-07-17 04:04:37 -0700 | [diff] [blame] | 474 | return nfserr_attrnotsupp; |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 475 | } else if (host_error < 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 476 | goto out_nfserr; |
| 477 | |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 478 | host_error = set_nfsv4_acl_one(dentry, pacl, POSIX_ACL_XATTR_ACCESS); |
| 479 | if (host_error < 0) |
J. Bruce Fields | 4b2ca38 | 2007-07-17 04:04:37 -0700 | [diff] [blame] | 480 | goto out_release; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 481 | |
J. Bruce Fields | 4b2ca38 | 2007-07-17 04:04:37 -0700 | [diff] [blame] | 482 | if (S_ISDIR(inode->i_mode)) |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 483 | host_error = set_nfsv4_acl_one(dentry, dpacl, POSIX_ACL_XATTR_DEFAULT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 484 | |
J. Bruce Fields | 4b2ca38 | 2007-07-17 04:04:37 -0700 | [diff] [blame] | 485 | out_release: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 486 | posix_acl_release(pacl); |
| 487 | posix_acl_release(dpacl); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 488 | out_nfserr: |
J. Bruce Fields | f34f924 | 2007-02-16 01:28:34 -0800 | [diff] [blame] | 489 | if (host_error == -EOPNOTSUPP) |
J. Bruce Fields | 4b2ca38 | 2007-07-17 04:04:37 -0700 | [diff] [blame] | 490 | return nfserr_attrnotsupp; |
J. Bruce Fields | f34f924 | 2007-02-16 01:28:34 -0800 | [diff] [blame] | 491 | else |
J. Bruce Fields | 4b2ca38 | 2007-07-17 04:04:37 -0700 | [diff] [blame] | 492 | return nfserrno(host_error); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 493 | } |
| 494 | |
| 495 | static struct posix_acl * |
| 496 | _get_posix_acl(struct dentry *dentry, char *key) |
| 497 | { |
Christoph Hellwig | 5be196e | 2006-01-09 20:51:55 -0800 | [diff] [blame] | 498 | void *buf = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 499 | struct posix_acl *pacl = NULL; |
Christoph Hellwig | 5be196e | 2006-01-09 20:51:55 -0800 | [diff] [blame] | 500 | int buflen; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 501 | |
Christoph Hellwig | 5be196e | 2006-01-09 20:51:55 -0800 | [diff] [blame] | 502 | buflen = nfsd_getxattr(dentry, key, &buf); |
| 503 | if (!buflen) |
| 504 | buflen = -ENODATA; |
| 505 | if (buflen <= 0) |
| 506 | return ERR_PTR(buflen); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 507 | |
| 508 | pacl = posix_acl_from_xattr(buf, buflen); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 509 | kfree(buf); |
| 510 | return pacl; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 511 | } |
| 512 | |
| 513 | int |
| 514 | nfsd4_get_nfs4_acl(struct svc_rqst *rqstp, struct dentry *dentry, struct nfs4_acl **acl) |
| 515 | { |
| 516 | struct inode *inode = dentry->d_inode; |
| 517 | int error = 0; |
| 518 | struct posix_acl *pacl = NULL, *dpacl = NULL; |
| 519 | unsigned int flags = 0; |
| 520 | |
Christoph Hellwig | 9a59f45 | 2005-06-23 00:10:19 -0700 | [diff] [blame] | 521 | pacl = _get_posix_acl(dentry, POSIX_ACL_XATTR_ACCESS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 522 | if (IS_ERR(pacl) && PTR_ERR(pacl) == -ENODATA) |
| 523 | pacl = posix_acl_from_mode(inode->i_mode, GFP_KERNEL); |
| 524 | if (IS_ERR(pacl)) { |
| 525 | error = PTR_ERR(pacl); |
| 526 | pacl = NULL; |
| 527 | goto out; |
| 528 | } |
| 529 | |
| 530 | if (S_ISDIR(inode->i_mode)) { |
Christoph Hellwig | 9a59f45 | 2005-06-23 00:10:19 -0700 | [diff] [blame] | 531 | dpacl = _get_posix_acl(dentry, POSIX_ACL_XATTR_DEFAULT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 532 | if (IS_ERR(dpacl) && PTR_ERR(dpacl) == -ENODATA) |
| 533 | dpacl = NULL; |
| 534 | else if (IS_ERR(dpacl)) { |
| 535 | error = PTR_ERR(dpacl); |
| 536 | dpacl = NULL; |
| 537 | goto out; |
| 538 | } |
| 539 | flags = NFS4_ACL_DIR; |
| 540 | } |
| 541 | |
| 542 | *acl = nfs4_acl_posix_to_nfsv4(pacl, dpacl, flags); |
| 543 | if (IS_ERR(*acl)) { |
| 544 | error = PTR_ERR(*acl); |
| 545 | *acl = NULL; |
| 546 | } |
| 547 | out: |
| 548 | posix_acl_release(pacl); |
| 549 | posix_acl_release(dpacl); |
| 550 | return error; |
| 551 | } |
| 552 | |
| 553 | #endif /* defined(CONFIG_NFS_V4) */ |
| 554 | |
| 555 | #ifdef CONFIG_NFSD_V3 |
| 556 | /* |
| 557 | * Check server access rights to a file system object |
| 558 | */ |
| 559 | struct accessmap { |
| 560 | u32 access; |
| 561 | int how; |
| 562 | }; |
| 563 | static struct accessmap nfs3_regaccess[] = { |
| 564 | { NFS3_ACCESS_READ, MAY_READ }, |
| 565 | { NFS3_ACCESS_EXECUTE, MAY_EXEC }, |
| 566 | { NFS3_ACCESS_MODIFY, MAY_WRITE|MAY_TRUNC }, |
| 567 | { NFS3_ACCESS_EXTEND, MAY_WRITE }, |
| 568 | |
| 569 | { 0, 0 } |
| 570 | }; |
| 571 | |
| 572 | static struct accessmap nfs3_diraccess[] = { |
| 573 | { NFS3_ACCESS_READ, MAY_READ }, |
| 574 | { NFS3_ACCESS_LOOKUP, MAY_EXEC }, |
| 575 | { NFS3_ACCESS_MODIFY, MAY_EXEC|MAY_WRITE|MAY_TRUNC }, |
| 576 | { NFS3_ACCESS_EXTEND, MAY_EXEC|MAY_WRITE }, |
| 577 | { NFS3_ACCESS_DELETE, MAY_REMOVE }, |
| 578 | |
| 579 | { 0, 0 } |
| 580 | }; |
| 581 | |
| 582 | static struct accessmap nfs3_anyaccess[] = { |
| 583 | /* Some clients - Solaris 2.6 at least, make an access call |
| 584 | * to the server to check for access for things like /dev/null |
| 585 | * (which really, the server doesn't care about). So |
| 586 | * We provide simple access checking for them, looking |
| 587 | * mainly at mode bits, and we make sure to ignore read-only |
| 588 | * filesystem checks |
| 589 | */ |
| 590 | { NFS3_ACCESS_READ, MAY_READ }, |
| 591 | { NFS3_ACCESS_EXECUTE, MAY_EXEC }, |
| 592 | { NFS3_ACCESS_MODIFY, MAY_WRITE|MAY_LOCAL_ACCESS }, |
| 593 | { NFS3_ACCESS_EXTEND, MAY_WRITE|MAY_LOCAL_ACCESS }, |
| 594 | |
| 595 | { 0, 0 } |
| 596 | }; |
| 597 | |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 598 | __be32 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 599 | nfsd_access(struct svc_rqst *rqstp, struct svc_fh *fhp, u32 *access, u32 *supported) |
| 600 | { |
| 601 | struct accessmap *map; |
| 602 | struct svc_export *export; |
| 603 | struct dentry *dentry; |
| 604 | u32 query, result = 0, sresult = 0; |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 605 | __be32 error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 606 | |
| 607 | error = fh_verify(rqstp, fhp, 0, MAY_NOP); |
| 608 | if (error) |
| 609 | goto out; |
| 610 | |
| 611 | export = fhp->fh_export; |
| 612 | dentry = fhp->fh_dentry; |
| 613 | |
| 614 | if (S_ISREG(dentry->d_inode->i_mode)) |
| 615 | map = nfs3_regaccess; |
| 616 | else if (S_ISDIR(dentry->d_inode->i_mode)) |
| 617 | map = nfs3_diraccess; |
| 618 | else |
| 619 | map = nfs3_anyaccess; |
| 620 | |
| 621 | |
| 622 | query = *access; |
| 623 | for (; map->access; map++) { |
| 624 | if (map->access & query) { |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 625 | __be32 err2; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 626 | |
| 627 | sresult |= map->access; |
| 628 | |
J. Bruce Fields | 0ec757d | 2007-07-17 04:04:48 -0700 | [diff] [blame] | 629 | err2 = nfsd_permission(rqstp, export, dentry, map->how); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 630 | switch (err2) { |
| 631 | case nfs_ok: |
| 632 | result |= map->access; |
| 633 | break; |
| 634 | |
| 635 | /* the following error codes just mean the access was not allowed, |
| 636 | * rather than an error occurred */ |
| 637 | case nfserr_rofs: |
| 638 | case nfserr_acces: |
| 639 | case nfserr_perm: |
| 640 | /* simply don't "or" in the access bit. */ |
| 641 | break; |
| 642 | default: |
| 643 | error = err2; |
| 644 | goto out; |
| 645 | } |
| 646 | } |
| 647 | } |
| 648 | *access = result; |
| 649 | if (supported) |
| 650 | *supported = sresult; |
| 651 | |
| 652 | out: |
| 653 | return error; |
| 654 | } |
| 655 | #endif /* CONFIG_NFSD_V3 */ |
| 656 | |
| 657 | |
| 658 | |
| 659 | /* |
| 660 | * Open an existing file or directory. |
| 661 | * The access argument indicates the type of open (read/write/lock) |
| 662 | * N.B. After this call fhp needs an fh_put |
| 663 | */ |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 664 | __be32 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 665 | nfsd_open(struct svc_rqst *rqstp, struct svc_fh *fhp, int type, |
| 666 | int access, struct file **filp) |
| 667 | { |
| 668 | struct dentry *dentry; |
| 669 | struct inode *inode; |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 670 | int flags = O_RDONLY|O_LARGEFILE; |
| 671 | __be32 err; |
| 672 | int host_err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 673 | |
| 674 | /* |
| 675 | * If we get here, then the client has already done an "open", |
| 676 | * and (hopefully) checked permission - so allow OWNER_OVERRIDE |
| 677 | * in case a chmod has now revoked permission. |
| 678 | */ |
| 679 | err = fh_verify(rqstp, fhp, type, access | MAY_OWNER_OVERRIDE); |
| 680 | if (err) |
| 681 | goto out; |
| 682 | |
| 683 | dentry = fhp->fh_dentry; |
| 684 | inode = dentry->d_inode; |
| 685 | |
| 686 | /* Disallow write access to files with the append-only bit set |
| 687 | * or any access when mandatory locking enabled |
| 688 | */ |
| 689 | err = nfserr_perm; |
| 690 | if (IS_APPEND(inode) && (access & MAY_WRITE)) |
| 691 | goto out; |
| 692 | if (IS_ISMNDLK(inode)) |
| 693 | goto out; |
| 694 | |
| 695 | if (!inode->i_fop) |
| 696 | goto out; |
| 697 | |
| 698 | /* |
| 699 | * Check to see if there are any leases on this file. |
| 700 | * This may block while leases are broken. |
| 701 | */ |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 702 | host_err = break_lease(inode, O_NONBLOCK | ((access & MAY_WRITE) ? FMODE_WRITE : 0)); |
| 703 | if (host_err == -EWOULDBLOCK) |
| 704 | host_err = -ETIMEDOUT; |
| 705 | if (host_err) /* NOMEM or WOULDBLOCK */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 706 | goto out_nfserr; |
| 707 | |
| 708 | if (access & MAY_WRITE) { |
J. Bruce Fields | 9ecb6a0 | 2006-06-30 01:56:17 -0700 | [diff] [blame] | 709 | if (access & MAY_READ) |
| 710 | flags = O_RDWR|O_LARGEFILE; |
| 711 | else |
| 712 | flags = O_WRONLY|O_LARGEFILE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 713 | |
| 714 | DQUOT_INIT(inode); |
| 715 | } |
| 716 | *filp = dentry_open(dget(dentry), mntget(fhp->fh_export->ex_mnt), flags); |
| 717 | if (IS_ERR(*filp)) |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 718 | host_err = PTR_ERR(*filp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 719 | out_nfserr: |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 720 | err = nfserrno(host_err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 721 | out: |
| 722 | return err; |
| 723 | } |
| 724 | |
| 725 | /* |
| 726 | * Close a file. |
| 727 | */ |
| 728 | void |
| 729 | nfsd_close(struct file *filp) |
| 730 | { |
| 731 | fput(filp); |
| 732 | } |
| 733 | |
| 734 | /* |
| 735 | * Sync a file |
| 736 | * As this calls fsync (not fdatasync) there is no need for a write_inode |
| 737 | * after it. |
| 738 | */ |
David Shaw | a334de2 | 2006-01-06 00:19:58 -0800 | [diff] [blame] | 739 | 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] | 740 | const struct file_operations *fop) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 741 | { |
| 742 | struct inode *inode = dp->d_inode; |
| 743 | int (*fsync) (struct file *, struct dentry *, int); |
YAMAMOTO Takashi | f193fba | 2006-01-18 17:43:13 -0800 | [diff] [blame] | 744 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 745 | |
YAMAMOTO Takashi | f193fba | 2006-01-18 17:43:13 -0800 | [diff] [blame] | 746 | err = filemap_fdatawrite(inode->i_mapping); |
| 747 | if (err == 0 && fop && (fsync = fop->fsync)) |
| 748 | err = fsync(filp, dp, 0); |
| 749 | if (err == 0) |
| 750 | err = filemap_fdatawait(inode->i_mapping); |
David Shaw | a334de2 | 2006-01-06 00:19:58 -0800 | [diff] [blame] | 751 | |
YAMAMOTO Takashi | f193fba | 2006-01-18 17:43:13 -0800 | [diff] [blame] | 752 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 753 | } |
| 754 | |
| 755 | |
David Shaw | a334de2 | 2006-01-06 00:19:58 -0800 | [diff] [blame] | 756 | static int |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 757 | nfsd_sync(struct file *filp) |
| 758 | { |
David Shaw | a334de2 | 2006-01-06 00:19:58 -0800 | [diff] [blame] | 759 | int err; |
Josef "Jeff" Sipek | 7eaa36e | 2006-12-08 02:36:41 -0800 | [diff] [blame] | 760 | struct inode *inode = filp->f_path.dentry->d_inode; |
| 761 | dprintk("nfsd: sync file %s\n", filp->f_path.dentry->d_name.name); |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 762 | mutex_lock(&inode->i_mutex); |
Josef "Jeff" Sipek | 7eaa36e | 2006-12-08 02:36:41 -0800 | [diff] [blame] | 763 | err=nfsd_dosync(filp, filp->f_path.dentry, filp->f_op); |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 764 | mutex_unlock(&inode->i_mutex); |
David Shaw | a334de2 | 2006-01-06 00:19:58 -0800 | [diff] [blame] | 765 | |
| 766 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 767 | } |
| 768 | |
YAMAMOTO Takashi | f193fba | 2006-01-18 17:43:13 -0800 | [diff] [blame] | 769 | int |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 770 | nfsd_sync_dir(struct dentry *dp) |
| 771 | { |
YAMAMOTO Takashi | f193fba | 2006-01-18 17:43:13 -0800 | [diff] [blame] | 772 | return nfsd_dosync(NULL, dp, dp->d_inode->i_fop); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 773 | } |
| 774 | |
| 775 | /* |
| 776 | * Obtain the readahead parameters for the file |
| 777 | * specified by (dev, ino). |
| 778 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 779 | |
| 780 | static inline struct raparms * |
| 781 | nfsd_get_raparms(dev_t dev, ino_t ino) |
| 782 | { |
| 783 | struct raparms *ra, **rap, **frap = NULL; |
| 784 | int depth = 0; |
Greg Banks | fce1456 | 2006-10-04 02:15:49 -0700 | [diff] [blame] | 785 | unsigned int hash; |
| 786 | struct raparm_hbucket *rab; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 787 | |
Greg Banks | fce1456 | 2006-10-04 02:15:49 -0700 | [diff] [blame] | 788 | hash = jhash_2words(dev, ino, 0xfeedbeef) & RAPARM_HASH_MASK; |
| 789 | rab = &raparm_hash[hash]; |
| 790 | |
| 791 | spin_lock(&rab->pb_lock); |
| 792 | for (rap = &rab->pb_head; (ra = *rap); rap = &ra->p_next) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 793 | if (ra->p_ino == ino && ra->p_dev == dev) |
| 794 | goto found; |
| 795 | depth++; |
| 796 | if (ra->p_count == 0) |
| 797 | frap = rap; |
| 798 | } |
| 799 | depth = nfsdstats.ra_size*11/10; |
| 800 | if (!frap) { |
Greg Banks | fce1456 | 2006-10-04 02:15:49 -0700 | [diff] [blame] | 801 | spin_unlock(&rab->pb_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 802 | return NULL; |
| 803 | } |
| 804 | rap = frap; |
| 805 | ra = *frap; |
| 806 | ra->p_dev = dev; |
| 807 | ra->p_ino = ino; |
| 808 | ra->p_set = 0; |
Greg Banks | fce1456 | 2006-10-04 02:15:49 -0700 | [diff] [blame] | 809 | ra->p_hindex = hash; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 810 | found: |
Greg Banks | fce1456 | 2006-10-04 02:15:49 -0700 | [diff] [blame] | 811 | if (rap != &rab->pb_head) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 812 | *rap = ra->p_next; |
Greg Banks | fce1456 | 2006-10-04 02:15:49 -0700 | [diff] [blame] | 813 | ra->p_next = rab->pb_head; |
| 814 | rab->pb_head = ra; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 815 | } |
| 816 | ra->p_count++; |
| 817 | nfsdstats.ra_depth[depth*10/nfsdstats.ra_size]++; |
Greg Banks | fce1456 | 2006-10-04 02:15:49 -0700 | [diff] [blame] | 818 | spin_unlock(&rab->pb_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 819 | return ra; |
| 820 | } |
| 821 | |
| 822 | /* |
Jens Axboe | cf8208d | 2007-06-12 21:22:14 +0200 | [diff] [blame] | 823 | * Grab and keep cached pages associated with a file in the svc_rqst |
| 824 | * so that they can be passed to the network sendmsg/sendpage routines |
| 825 | * directly. They will be released after the sending has completed. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 826 | */ |
| 827 | static int |
Jens Axboe | cf8208d | 2007-06-12 21:22:14 +0200 | [diff] [blame] | 828 | nfsd_splice_actor(struct pipe_inode_info *pipe, struct pipe_buffer *buf, |
| 829 | struct splice_desc *sd) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 830 | { |
Jens Axboe | cf8208d | 2007-06-12 21:22:14 +0200 | [diff] [blame] | 831 | struct svc_rqst *rqstp = sd->u.data; |
NeilBrown | 4452435 | 2006-10-04 02:15:46 -0700 | [diff] [blame] | 832 | struct page **pp = rqstp->rq_respages + rqstp->rq_resused; |
Jens Axboe | cf8208d | 2007-06-12 21:22:14 +0200 | [diff] [blame] | 833 | struct page *page = buf->page; |
| 834 | size_t size; |
| 835 | int ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 836 | |
Jens Axboe | cac36bb0 | 2007-06-14 13:10:48 +0200 | [diff] [blame] | 837 | ret = buf->ops->confirm(pipe, buf); |
Jens Axboe | cf8208d | 2007-06-12 21:22:14 +0200 | [diff] [blame] | 838 | if (unlikely(ret)) |
| 839 | return ret; |
| 840 | |
| 841 | size = sd->len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 842 | |
| 843 | if (rqstp->rq_res.page_len == 0) { |
| 844 | get_page(page); |
NeilBrown | 4452435 | 2006-10-04 02:15:46 -0700 | [diff] [blame] | 845 | put_page(*pp); |
| 846 | *pp = page; |
| 847 | rqstp->rq_resused++; |
Jens Axboe | cf8208d | 2007-06-12 21:22:14 +0200 | [diff] [blame] | 848 | rqstp->rq_res.page_base = buf->offset; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 849 | rqstp->rq_res.page_len = size; |
NeilBrown | 4452435 | 2006-10-04 02:15:46 -0700 | [diff] [blame] | 850 | } else if (page != pp[-1]) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 851 | get_page(page); |
NeilBrown | 250f391 | 2007-01-26 00:56:59 -0800 | [diff] [blame] | 852 | if (*pp) |
| 853 | put_page(*pp); |
NeilBrown | 4452435 | 2006-10-04 02:15:46 -0700 | [diff] [blame] | 854 | *pp = page; |
| 855 | rqstp->rq_resused++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 856 | rqstp->rq_res.page_len += size; |
NeilBrown | 4452435 | 2006-10-04 02:15:46 -0700 | [diff] [blame] | 857 | } else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 858 | rqstp->rq_res.page_len += size; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 859 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 860 | return size; |
| 861 | } |
| 862 | |
Jens Axboe | cf8208d | 2007-06-12 21:22:14 +0200 | [diff] [blame] | 863 | static int nfsd_direct_splice_actor(struct pipe_inode_info *pipe, |
| 864 | struct splice_desc *sd) |
| 865 | { |
| 866 | return __splice_from_pipe(pipe, sd, nfsd_splice_actor); |
| 867 | } |
| 868 | |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 869 | static __be32 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 870 | nfsd_vfs_read(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file, |
| 871 | loff_t offset, struct kvec *vec, int vlen, unsigned long *count) |
| 872 | { |
| 873 | struct inode *inode; |
| 874 | struct raparms *ra; |
| 875 | mm_segment_t oldfs; |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 876 | __be32 err; |
| 877 | int host_err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 878 | |
| 879 | err = nfserr_perm; |
Josef "Jeff" Sipek | 7eaa36e | 2006-12-08 02:36:41 -0800 | [diff] [blame] | 880 | inode = file->f_path.dentry->d_inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 881 | #ifdef MSNFS |
| 882 | if ((fhp->fh_export->ex_flags & NFSEXP_MSNFS) && |
| 883 | (!lock_may_read(inode, offset, *count))) |
| 884 | goto out; |
| 885 | #endif |
| 886 | |
| 887 | /* Get readahead parameters */ |
| 888 | ra = nfsd_get_raparms(inode->i_sb->s_dev, inode->i_ino); |
| 889 | |
| 890 | if (ra && ra->p_set) |
| 891 | file->f_ra = ra->p_ra; |
| 892 | |
Jens Axboe | cf8208d | 2007-06-12 21:22:14 +0200 | [diff] [blame] | 893 | if (file->f_op->splice_read && rqstp->rq_splice_ok) { |
| 894 | struct splice_desc sd = { |
| 895 | .len = 0, |
| 896 | .total_len = *count, |
| 897 | .pos = offset, |
| 898 | .u.data = rqstp, |
| 899 | }; |
| 900 | |
Jens Axboe | 4fbef20 | 2007-07-13 22:42:20 +0200 | [diff] [blame] | 901 | rqstp->rq_resused = 1; |
Jens Axboe | cf8208d | 2007-06-12 21:22:14 +0200 | [diff] [blame] | 902 | host_err = splice_direct_to_actor(file, &sd, nfsd_direct_splice_actor); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 903 | } else { |
| 904 | oldfs = get_fs(); |
| 905 | set_fs(KERNEL_DS); |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 906 | host_err = vfs_readv(file, (struct iovec __user *)vec, vlen, &offset); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 907 | set_fs(oldfs); |
| 908 | } |
| 909 | |
| 910 | /* Write back readahead params */ |
| 911 | if (ra) { |
Greg Banks | fce1456 | 2006-10-04 02:15:49 -0700 | [diff] [blame] | 912 | struct raparm_hbucket *rab = &raparm_hash[ra->p_hindex]; |
| 913 | spin_lock(&rab->pb_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 914 | ra->p_ra = file->f_ra; |
| 915 | ra->p_set = 1; |
| 916 | ra->p_count--; |
Greg Banks | fce1456 | 2006-10-04 02:15:49 -0700 | [diff] [blame] | 917 | spin_unlock(&rab->pb_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 918 | } |
| 919 | |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 920 | if (host_err >= 0) { |
| 921 | nfsdstats.io_read += host_err; |
| 922 | *count = host_err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 923 | err = 0; |
Josef "Jeff" Sipek | 7eaa36e | 2006-12-08 02:36:41 -0800 | [diff] [blame] | 924 | fsnotify_access(file->f_path.dentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 925 | } else |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 926 | err = nfserrno(host_err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 927 | out: |
| 928 | return err; |
| 929 | } |
| 930 | |
Neil Brown | 9f708e4 | 2006-01-06 00:19:59 -0800 | [diff] [blame] | 931 | static void kill_suid(struct dentry *dentry) |
| 932 | { |
| 933 | struct iattr ia; |
| 934 | ia.ia_valid = ATTR_KILL_SUID | ATTR_KILL_SGID; |
| 935 | |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 936 | mutex_lock(&dentry->d_inode->i_mutex); |
Neil Brown | 9f708e4 | 2006-01-06 00:19:59 -0800 | [diff] [blame] | 937 | notify_change(dentry, &ia); |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 938 | mutex_unlock(&dentry->d_inode->i_mutex); |
Neil Brown | 9f708e4 | 2006-01-06 00:19:59 -0800 | [diff] [blame] | 939 | } |
| 940 | |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 941 | static __be32 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 942 | nfsd_vfs_write(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file, |
| 943 | loff_t offset, struct kvec *vec, int vlen, |
| 944 | unsigned long cnt, int *stablep) |
| 945 | { |
| 946 | struct svc_export *exp; |
| 947 | struct dentry *dentry; |
| 948 | struct inode *inode; |
| 949 | mm_segment_t oldfs; |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 950 | __be32 err = 0; |
| 951 | int host_err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 952 | int stable = *stablep; |
| 953 | |
NeilBrown | 45bd3b3 | 2006-01-18 17:43:50 -0800 | [diff] [blame] | 954 | #ifdef MSNFS |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 955 | err = nfserr_perm; |
| 956 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 957 | if ((fhp->fh_export->ex_flags & NFSEXP_MSNFS) && |
Josef "Jeff" Sipek | 7eaa36e | 2006-12-08 02:36:41 -0800 | [diff] [blame] | 958 | (!lock_may_write(file->f_path.dentry->d_inode, offset, cnt))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 959 | goto out; |
| 960 | #endif |
| 961 | |
Josef "Jeff" Sipek | 7eaa36e | 2006-12-08 02:36:41 -0800 | [diff] [blame] | 962 | dentry = file->f_path.dentry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 963 | inode = dentry->d_inode; |
| 964 | exp = fhp->fh_export; |
| 965 | |
| 966 | /* |
| 967 | * Request sync writes if |
| 968 | * - the sync export option has been set, or |
| 969 | * - the client requested O_SYNC behavior (NFSv3 feature). |
| 970 | * - The file system doesn't support fsync(). |
| 971 | * When gathered writes have been configured for this volume, |
| 972 | * flushing the data to disk is handled separately below. |
| 973 | */ |
| 974 | |
| 975 | if (file->f_op->fsync == 0) {/* COMMIT3 cannot work */ |
| 976 | stable = 2; |
| 977 | *stablep = 2; /* FILE_SYNC */ |
| 978 | } |
| 979 | |
| 980 | if (!EX_ISSYNC(exp)) |
| 981 | stable = 0; |
| 982 | if (stable && !EX_WGATHER(exp)) |
| 983 | file->f_flags |= O_SYNC; |
| 984 | |
| 985 | /* Write the data. */ |
| 986 | oldfs = get_fs(); set_fs(KERNEL_DS); |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 987 | host_err = vfs_writev(file, (struct iovec __user *)vec, vlen, &offset); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 988 | set_fs(oldfs); |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 989 | if (host_err >= 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 990 | nfsdstats.io_write += cnt; |
Josef "Jeff" Sipek | 7eaa36e | 2006-12-08 02:36:41 -0800 | [diff] [blame] | 991 | fsnotify_modify(file->f_path.dentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 992 | } |
| 993 | |
| 994 | /* clear setuid/setgid flag after write */ |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 995 | if (host_err >= 0 && (inode->i_mode & (S_ISUID | S_ISGID))) |
Neil Brown | 9f708e4 | 2006-01-06 00:19:59 -0800 | [diff] [blame] | 996 | kill_suid(dentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 997 | |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 998 | if (host_err >= 0 && stable) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 999 | static ino_t last_ino; |
| 1000 | static dev_t last_dev; |
| 1001 | |
| 1002 | /* |
| 1003 | * Gathered writes: If another process is currently |
| 1004 | * writing to the file, there's a high chance |
| 1005 | * this is another nfsd (triggered by a bulk write |
| 1006 | * from a client's biod). Rather than syncing the |
| 1007 | * file with each write request, we sleep for 10 msec. |
| 1008 | * |
| 1009 | * I don't know if this roughly approximates |
| 1010 | * C. Juszak's idea of gathered writes, but it's a |
| 1011 | * nice and simple solution (IMHO), and it seems to |
| 1012 | * work:-) |
| 1013 | */ |
| 1014 | if (EX_WGATHER(exp)) { |
| 1015 | if (atomic_read(&inode->i_writecount) > 1 |
| 1016 | || (last_ino == inode->i_ino && last_dev == inode->i_sb->s_dev)) { |
| 1017 | dprintk("nfsd: write defer %d\n", current->pid); |
| 1018 | msleep(10); |
| 1019 | dprintk("nfsd: write resume %d\n", current->pid); |
| 1020 | } |
| 1021 | |
| 1022 | if (inode->i_state & I_DIRTY) { |
| 1023 | dprintk("nfsd: write sync %d\n", current->pid); |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1024 | host_err=nfsd_sync(file); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1025 | } |
| 1026 | #if 0 |
| 1027 | wake_up(&inode->i_wait); |
| 1028 | #endif |
| 1029 | } |
| 1030 | last_ino = inode->i_ino; |
| 1031 | last_dev = inode->i_sb->s_dev; |
| 1032 | } |
| 1033 | |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1034 | dprintk("nfsd: write complete host_err=%d\n", host_err); |
| 1035 | if (host_err >= 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1036 | err = 0; |
| 1037 | else |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1038 | err = nfserrno(host_err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1039 | out: |
| 1040 | return err; |
| 1041 | } |
| 1042 | |
| 1043 | /* |
| 1044 | * Read data from a file. count must contain the requested read count |
| 1045 | * on entry. On return, *count contains the number of bytes actually read. |
| 1046 | * N.B. After this call fhp needs an fh_put |
| 1047 | */ |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1048 | __be32 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1049 | nfsd_read(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file, |
| 1050 | loff_t offset, struct kvec *vec, int vlen, |
| 1051 | unsigned long *count) |
| 1052 | { |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1053 | __be32 err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1054 | |
| 1055 | if (file) { |
J. Bruce Fields | 0ec757d | 2007-07-17 04:04:48 -0700 | [diff] [blame] | 1056 | err = nfsd_permission(rqstp, fhp->fh_export, fhp->fh_dentry, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1057 | MAY_READ|MAY_OWNER_OVERRIDE); |
| 1058 | if (err) |
| 1059 | goto out; |
| 1060 | err = nfsd_vfs_read(rqstp, fhp, file, offset, vec, vlen, count); |
| 1061 | } else { |
| 1062 | err = nfsd_open(rqstp, fhp, S_IFREG, MAY_READ, &file); |
| 1063 | if (err) |
| 1064 | goto out; |
| 1065 | err = nfsd_vfs_read(rqstp, fhp, file, offset, vec, vlen, count); |
| 1066 | nfsd_close(file); |
| 1067 | } |
| 1068 | out: |
| 1069 | return err; |
| 1070 | } |
| 1071 | |
| 1072 | /* |
| 1073 | * Write data to a file. |
| 1074 | * The stable flag requests synchronous writes. |
| 1075 | * N.B. After this call fhp needs an fh_put |
| 1076 | */ |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1077 | __be32 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1078 | nfsd_write(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file, |
| 1079 | loff_t offset, struct kvec *vec, int vlen, unsigned long cnt, |
| 1080 | int *stablep) |
| 1081 | { |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1082 | __be32 err = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1083 | |
| 1084 | if (file) { |
J. Bruce Fields | 0ec757d | 2007-07-17 04:04:48 -0700 | [diff] [blame] | 1085 | err = nfsd_permission(rqstp, fhp->fh_export, fhp->fh_dentry, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1086 | MAY_WRITE|MAY_OWNER_OVERRIDE); |
| 1087 | if (err) |
| 1088 | goto out; |
| 1089 | err = nfsd_vfs_write(rqstp, fhp, file, offset, vec, vlen, cnt, |
| 1090 | stablep); |
| 1091 | } else { |
| 1092 | err = nfsd_open(rqstp, fhp, S_IFREG, MAY_WRITE, &file); |
| 1093 | if (err) |
| 1094 | goto out; |
| 1095 | |
| 1096 | if (cnt) |
| 1097 | err = nfsd_vfs_write(rqstp, fhp, file, offset, vec, vlen, |
| 1098 | cnt, stablep); |
| 1099 | nfsd_close(file); |
| 1100 | } |
| 1101 | out: |
| 1102 | return err; |
| 1103 | } |
| 1104 | |
| 1105 | #ifdef CONFIG_NFSD_V3 |
| 1106 | /* |
| 1107 | * Commit all pending writes to stable storage. |
| 1108 | * Strictly speaking, we could sync just the indicated file region here, |
| 1109 | * but there's currently no way we can ask the VFS to do so. |
| 1110 | * |
| 1111 | * Unfortunately we cannot lock the file to make sure we return full WCC |
| 1112 | * data to the client, as locking happens lower down in the filesystem. |
| 1113 | */ |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1114 | __be32 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1115 | nfsd_commit(struct svc_rqst *rqstp, struct svc_fh *fhp, |
| 1116 | loff_t offset, unsigned long count) |
| 1117 | { |
| 1118 | struct file *file; |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1119 | __be32 err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1120 | |
| 1121 | if ((u64)count > ~(u64)offset) |
| 1122 | return nfserr_inval; |
| 1123 | |
| 1124 | if ((err = nfsd_open(rqstp, fhp, S_IFREG, MAY_WRITE, &file)) != 0) |
| 1125 | return err; |
| 1126 | if (EX_ISSYNC(fhp->fh_export)) { |
| 1127 | if (file->f_op && file->f_op->fsync) { |
NeilBrown | 45bd3b3 | 2006-01-18 17:43:50 -0800 | [diff] [blame] | 1128 | err = nfserrno(nfsd_sync(file)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1129 | } else { |
| 1130 | err = nfserr_notsupp; |
| 1131 | } |
| 1132 | } |
| 1133 | |
| 1134 | nfsd_close(file); |
| 1135 | return err; |
| 1136 | } |
| 1137 | #endif /* CONFIG_NFSD_V3 */ |
| 1138 | |
| 1139 | /* |
| 1140 | * Create a file (regular, directory, device, fifo); UNIX sockets |
| 1141 | * not yet implemented. |
| 1142 | * If the response fh has been verified, the parent directory should |
| 1143 | * already be locked. Note that the parent directory is left locked. |
| 1144 | * |
| 1145 | * N.B. Every call to nfsd_create needs an fh_put for _both_ fhp and resfhp |
| 1146 | */ |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1147 | __be32 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1148 | nfsd_create(struct svc_rqst *rqstp, struct svc_fh *fhp, |
| 1149 | char *fname, int flen, struct iattr *iap, |
| 1150 | int type, dev_t rdev, struct svc_fh *resfhp) |
| 1151 | { |
| 1152 | struct dentry *dentry, *dchild = NULL; |
| 1153 | struct inode *dirp; |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1154 | __be32 err; |
| 1155 | int host_err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1156 | |
| 1157 | err = nfserr_perm; |
| 1158 | if (!flen) |
| 1159 | goto out; |
| 1160 | err = nfserr_exist; |
| 1161 | if (isdotent(fname, flen)) |
| 1162 | goto out; |
| 1163 | |
| 1164 | err = fh_verify(rqstp, fhp, S_IFDIR, MAY_CREATE); |
| 1165 | if (err) |
| 1166 | goto out; |
| 1167 | |
| 1168 | dentry = fhp->fh_dentry; |
| 1169 | dirp = dentry->d_inode; |
| 1170 | |
| 1171 | err = nfserr_notdir; |
| 1172 | if(!dirp->i_op || !dirp->i_op->lookup) |
| 1173 | goto out; |
| 1174 | /* |
| 1175 | * Check whether the response file handle has been verified yet. |
| 1176 | * If it has, the parent directory should already be locked. |
| 1177 | */ |
| 1178 | if (!resfhp->fh_dentry) { |
| 1179 | /* called from nfsd_proc_mkdir, or possibly nfsd3_proc_create */ |
Peter Zijlstra | 12fd352 | 2006-10-02 02:18:03 -0700 | [diff] [blame] | 1180 | fh_lock_nested(fhp, I_MUTEX_PARENT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1181 | dchild = lookup_one_len(fname, dentry, flen); |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1182 | host_err = PTR_ERR(dchild); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1183 | if (IS_ERR(dchild)) |
| 1184 | goto out_nfserr; |
| 1185 | err = fh_compose(resfhp, fhp->fh_export, dchild, fhp); |
| 1186 | if (err) |
| 1187 | goto out; |
| 1188 | } else { |
| 1189 | /* called from nfsd_proc_create */ |
| 1190 | dchild = dget(resfhp->fh_dentry); |
| 1191 | if (!fhp->fh_locked) { |
| 1192 | /* not actually possible */ |
| 1193 | printk(KERN_ERR |
| 1194 | "nfsd_create: parent %s/%s not locked!\n", |
| 1195 | dentry->d_parent->d_name.name, |
| 1196 | dentry->d_name.name); |
Al Viro | d75f2b9 | 2006-01-18 17:43:44 -0800 | [diff] [blame] | 1197 | err = nfserr_io; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1198 | goto out; |
| 1199 | } |
| 1200 | } |
| 1201 | /* |
| 1202 | * Make sure the child dentry is still negative ... |
| 1203 | */ |
| 1204 | err = nfserr_exist; |
| 1205 | if (dchild->d_inode) { |
| 1206 | dprintk("nfsd_create: dentry %s/%s not negative!\n", |
| 1207 | dentry->d_name.name, dchild->d_name.name); |
| 1208 | goto out; |
| 1209 | } |
| 1210 | |
| 1211 | if (!(iap->ia_valid & ATTR_MODE)) |
| 1212 | iap->ia_mode = 0; |
| 1213 | iap->ia_mode = (iap->ia_mode & S_IALLUGO) | type; |
| 1214 | |
| 1215 | /* |
| 1216 | * Get the dir op function pointer. |
| 1217 | */ |
J. Bruce Fields | 088406b | 2006-11-08 17:44:59 -0800 | [diff] [blame] | 1218 | err = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1219 | switch (type) { |
| 1220 | case S_IFREG: |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1221 | host_err = vfs_create(dirp, dchild, iap->ia_mode, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1222 | break; |
| 1223 | case S_IFDIR: |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1224 | host_err = vfs_mkdir(dirp, dchild, iap->ia_mode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1225 | break; |
| 1226 | case S_IFCHR: |
| 1227 | case S_IFBLK: |
| 1228 | case S_IFIFO: |
| 1229 | case S_IFSOCK: |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1230 | host_err = vfs_mknod(dirp, dchild, iap->ia_mode, rdev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1231 | break; |
| 1232 | default: |
| 1233 | printk("nfsd: bad file type %o in nfsd_create\n", type); |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1234 | host_err = -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1235 | } |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1236 | if (host_err < 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1237 | goto out_nfserr; |
| 1238 | |
| 1239 | if (EX_ISSYNC(fhp->fh_export)) { |
NeilBrown | 45bd3b3 | 2006-01-18 17:43:50 -0800 | [diff] [blame] | 1240 | err = nfserrno(nfsd_sync_dir(dentry)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1241 | write_inode_now(dchild->d_inode, 1); |
| 1242 | } |
| 1243 | |
| 1244 | |
| 1245 | /* Set file attributes. Mode has already been set and |
| 1246 | * setting uid/gid works only for root. Irix appears to |
| 1247 | * send along the gid when it tries to implement setgid |
| 1248 | * directories via NFS. |
| 1249 | */ |
YAMAMOTO Takashi | f193fba | 2006-01-18 17:43:13 -0800 | [diff] [blame] | 1250 | if ((iap->ia_valid &= ~(ATTR_UID|ATTR_GID|ATTR_MODE)) != 0) { |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1251 | __be32 err2 = nfsd_setattr(rqstp, resfhp, iap, 0, (time_t)0); |
YAMAMOTO Takashi | f193fba | 2006-01-18 17:43:13 -0800 | [diff] [blame] | 1252 | if (err2) |
| 1253 | err = err2; |
| 1254 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1255 | /* |
| 1256 | * Update the file handle to get the new inode info. |
| 1257 | */ |
| 1258 | if (!err) |
| 1259 | err = fh_update(resfhp); |
| 1260 | out: |
| 1261 | if (dchild && !IS_ERR(dchild)) |
| 1262 | dput(dchild); |
| 1263 | return err; |
| 1264 | |
| 1265 | out_nfserr: |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1266 | err = nfserrno(host_err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1267 | goto out; |
| 1268 | } |
| 1269 | |
| 1270 | #ifdef CONFIG_NFSD_V3 |
| 1271 | /* |
| 1272 | * NFSv3 version of nfsd_create |
| 1273 | */ |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1274 | __be32 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1275 | nfsd_create_v3(struct svc_rqst *rqstp, struct svc_fh *fhp, |
| 1276 | char *fname, int flen, struct iattr *iap, |
| 1277 | struct svc_fh *resfhp, int createmode, u32 *verifier, |
J. Bruce Fields | 81ac95c | 2006-11-08 17:44:40 -0800 | [diff] [blame] | 1278 | int *truncp, int *created) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1279 | { |
| 1280 | struct dentry *dentry, *dchild = NULL; |
| 1281 | struct inode *dirp; |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1282 | __be32 err; |
| 1283 | int host_err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1284 | __u32 v_mtime=0, v_atime=0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1285 | |
| 1286 | err = nfserr_perm; |
| 1287 | if (!flen) |
| 1288 | goto out; |
| 1289 | err = nfserr_exist; |
| 1290 | if (isdotent(fname, flen)) |
| 1291 | goto out; |
| 1292 | if (!(iap->ia_valid & ATTR_MODE)) |
| 1293 | iap->ia_mode = 0; |
| 1294 | err = fh_verify(rqstp, fhp, S_IFDIR, MAY_CREATE); |
| 1295 | if (err) |
| 1296 | goto out; |
| 1297 | |
| 1298 | dentry = fhp->fh_dentry; |
| 1299 | dirp = dentry->d_inode; |
| 1300 | |
| 1301 | /* Get all the sanity checks out of the way before |
| 1302 | * we lock the parent. */ |
| 1303 | err = nfserr_notdir; |
| 1304 | if(!dirp->i_op || !dirp->i_op->lookup) |
| 1305 | goto out; |
Peter Zijlstra | 12fd352 | 2006-10-02 02:18:03 -0700 | [diff] [blame] | 1306 | fh_lock_nested(fhp, I_MUTEX_PARENT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1307 | |
| 1308 | /* |
| 1309 | * Compose the response file handle. |
| 1310 | */ |
| 1311 | dchild = lookup_one_len(fname, dentry, flen); |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1312 | host_err = PTR_ERR(dchild); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1313 | if (IS_ERR(dchild)) |
| 1314 | goto out_nfserr; |
| 1315 | |
| 1316 | err = fh_compose(resfhp, fhp->fh_export, dchild, fhp); |
| 1317 | if (err) |
| 1318 | goto out; |
| 1319 | |
| 1320 | if (createmode == NFS3_CREATE_EXCLUSIVE) { |
Peter Staubach | c397852 | 2007-01-26 00:57:00 -0800 | [diff] [blame] | 1321 | /* solaris7 gets confused (bugid 4218508) if these have |
Jeff Layton | 749997e | 2007-07-31 00:37:51 -0700 | [diff] [blame] | 1322 | * the high bit set, so just clear the high bits. If this is |
| 1323 | * ever changed to use different attrs for storing the |
| 1324 | * verifier, then do_open_lookup() will also need to be fixed |
| 1325 | * accordingly. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1326 | */ |
| 1327 | v_mtime = verifier[0]&0x7fffffff; |
| 1328 | v_atime = verifier[1]&0x7fffffff; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1329 | } |
| 1330 | |
| 1331 | if (dchild->d_inode) { |
| 1332 | err = 0; |
| 1333 | |
| 1334 | switch (createmode) { |
| 1335 | case NFS3_CREATE_UNCHECKED: |
| 1336 | if (! S_ISREG(dchild->d_inode->i_mode)) |
| 1337 | err = nfserr_exist; |
| 1338 | else if (truncp) { |
| 1339 | /* in nfsv4, we need to treat this case a little |
| 1340 | * differently. we don't want to truncate the |
| 1341 | * file now; this would be wrong if the OPEN |
| 1342 | * fails for some other reason. furthermore, |
| 1343 | * if the size is nonzero, we should ignore it |
| 1344 | * according to spec! |
| 1345 | */ |
| 1346 | *truncp = (iap->ia_valid & ATTR_SIZE) && !iap->ia_size; |
| 1347 | } |
| 1348 | else { |
| 1349 | iap->ia_valid &= ATTR_SIZE; |
| 1350 | goto set_attr; |
| 1351 | } |
| 1352 | break; |
| 1353 | case NFS3_CREATE_EXCLUSIVE: |
| 1354 | if ( dchild->d_inode->i_mtime.tv_sec == v_mtime |
| 1355 | && dchild->d_inode->i_atime.tv_sec == v_atime |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1356 | && dchild->d_inode->i_size == 0 ) |
| 1357 | break; |
| 1358 | /* fallthru */ |
| 1359 | case NFS3_CREATE_GUARDED: |
| 1360 | err = nfserr_exist; |
| 1361 | } |
| 1362 | goto out; |
| 1363 | } |
| 1364 | |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1365 | host_err = vfs_create(dirp, dchild, iap->ia_mode, NULL); |
| 1366 | if (host_err < 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1367 | goto out_nfserr; |
J. Bruce Fields | 81ac95c | 2006-11-08 17:44:40 -0800 | [diff] [blame] | 1368 | if (created) |
| 1369 | *created = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1370 | |
| 1371 | if (EX_ISSYNC(fhp->fh_export)) { |
NeilBrown | 45bd3b3 | 2006-01-18 17:43:50 -0800 | [diff] [blame] | 1372 | err = nfserrno(nfsd_sync_dir(dentry)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1373 | /* setattr will sync the child (or not) */ |
| 1374 | } |
| 1375 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1376 | if (createmode == NFS3_CREATE_EXCLUSIVE) { |
Peter Staubach | c397852 | 2007-01-26 00:57:00 -0800 | [diff] [blame] | 1377 | /* Cram the verifier into atime/mtime */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1378 | iap->ia_valid = ATTR_MTIME|ATTR_ATIME |
Peter Staubach | c397852 | 2007-01-26 00:57:00 -0800 | [diff] [blame] | 1379 | | ATTR_MTIME_SET|ATTR_ATIME_SET; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1380 | /* XXX someone who knows this better please fix it for nsec */ |
| 1381 | iap->ia_mtime.tv_sec = v_mtime; |
| 1382 | iap->ia_atime.tv_sec = v_atime; |
| 1383 | iap->ia_mtime.tv_nsec = 0; |
| 1384 | iap->ia_atime.tv_nsec = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1385 | } |
| 1386 | |
| 1387 | /* Set file attributes. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1388 | * Irix appears to send along the gid when it tries to |
| 1389 | * implement setgid directories via NFS. Clear out all that cruft. |
| 1390 | */ |
| 1391 | set_attr: |
Peter Staubach | c397852 | 2007-01-26 00:57:00 -0800 | [diff] [blame] | 1392 | if ((iap->ia_valid &= ~(ATTR_UID|ATTR_GID|ATTR_MODE)) != 0) { |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1393 | __be32 err2 = nfsd_setattr(rqstp, resfhp, iap, 0, (time_t)0); |
YAMAMOTO Takashi | f193fba | 2006-01-18 17:43:13 -0800 | [diff] [blame] | 1394 | if (err2) |
NeilBrown | 45bd3b3 | 2006-01-18 17:43:50 -0800 | [diff] [blame] | 1395 | err = err2; |
YAMAMOTO Takashi | f193fba | 2006-01-18 17:43:13 -0800 | [diff] [blame] | 1396 | } |
| 1397 | |
| 1398 | /* |
| 1399 | * Update the filehandle to get the new inode info. |
| 1400 | */ |
| 1401 | if (!err) |
| 1402 | err = fh_update(resfhp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1403 | |
| 1404 | out: |
| 1405 | fh_unlock(fhp); |
| 1406 | if (dchild && !IS_ERR(dchild)) |
| 1407 | dput(dchild); |
| 1408 | return err; |
| 1409 | |
| 1410 | out_nfserr: |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1411 | err = nfserrno(host_err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1412 | goto out; |
| 1413 | } |
| 1414 | #endif /* CONFIG_NFSD_V3 */ |
| 1415 | |
| 1416 | /* |
| 1417 | * Read a symlink. On entry, *lenp must contain the maximum path length that |
| 1418 | * fits into the buffer. On return, it contains the true length. |
| 1419 | * N.B. After this call fhp needs an fh_put |
| 1420 | */ |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1421 | __be32 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1422 | nfsd_readlink(struct svc_rqst *rqstp, struct svc_fh *fhp, char *buf, int *lenp) |
| 1423 | { |
| 1424 | struct dentry *dentry; |
| 1425 | struct inode *inode; |
| 1426 | mm_segment_t oldfs; |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1427 | __be32 err; |
| 1428 | int host_err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1429 | |
| 1430 | err = fh_verify(rqstp, fhp, S_IFLNK, MAY_NOP); |
| 1431 | if (err) |
| 1432 | goto out; |
| 1433 | |
| 1434 | dentry = fhp->fh_dentry; |
| 1435 | inode = dentry->d_inode; |
| 1436 | |
| 1437 | err = nfserr_inval; |
| 1438 | if (!inode->i_op || !inode->i_op->readlink) |
| 1439 | goto out; |
| 1440 | |
| 1441 | touch_atime(fhp->fh_export->ex_mnt, dentry); |
| 1442 | /* N.B. Why does this call need a get_fs()?? |
| 1443 | * Remove the set_fs and watch the fireworks:-) --okir |
| 1444 | */ |
| 1445 | |
| 1446 | oldfs = get_fs(); set_fs(KERNEL_DS); |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1447 | host_err = inode->i_op->readlink(dentry, buf, *lenp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1448 | set_fs(oldfs); |
| 1449 | |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1450 | if (host_err < 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1451 | goto out_nfserr; |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1452 | *lenp = host_err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1453 | err = 0; |
| 1454 | out: |
| 1455 | return err; |
| 1456 | |
| 1457 | out_nfserr: |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1458 | err = nfserrno(host_err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1459 | goto out; |
| 1460 | } |
| 1461 | |
| 1462 | /* |
| 1463 | * Create a symlink and look up its inode |
| 1464 | * N.B. After this call _both_ fhp and resfhp need an fh_put |
| 1465 | */ |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1466 | __be32 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1467 | nfsd_symlink(struct svc_rqst *rqstp, struct svc_fh *fhp, |
| 1468 | char *fname, int flen, |
| 1469 | char *path, int plen, |
| 1470 | struct svc_fh *resfhp, |
| 1471 | struct iattr *iap) |
| 1472 | { |
| 1473 | struct dentry *dentry, *dnew; |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1474 | __be32 err, cerr; |
| 1475 | int host_err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1476 | umode_t mode; |
| 1477 | |
| 1478 | err = nfserr_noent; |
| 1479 | if (!flen || !plen) |
| 1480 | goto out; |
| 1481 | err = nfserr_exist; |
| 1482 | if (isdotent(fname, flen)) |
| 1483 | goto out; |
| 1484 | |
| 1485 | err = fh_verify(rqstp, fhp, S_IFDIR, MAY_CREATE); |
| 1486 | if (err) |
| 1487 | goto out; |
| 1488 | fh_lock(fhp); |
| 1489 | dentry = fhp->fh_dentry; |
| 1490 | dnew = lookup_one_len(fname, dentry, flen); |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1491 | host_err = PTR_ERR(dnew); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1492 | if (IS_ERR(dnew)) |
| 1493 | goto out_nfserr; |
| 1494 | |
| 1495 | mode = S_IALLUGO; |
| 1496 | /* Only the MODE ATTRibute is even vaguely meaningful */ |
| 1497 | if (iap && (iap->ia_valid & ATTR_MODE)) |
| 1498 | mode = iap->ia_mode & S_IALLUGO; |
| 1499 | |
| 1500 | if (unlikely(path[plen] != 0)) { |
| 1501 | char *path_alloced = kmalloc(plen+1, GFP_KERNEL); |
| 1502 | if (path_alloced == NULL) |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1503 | host_err = -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1504 | else { |
| 1505 | strncpy(path_alloced, path, plen); |
| 1506 | path_alloced[plen] = 0; |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1507 | host_err = vfs_symlink(dentry->d_inode, dnew, path_alloced, mode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1508 | kfree(path_alloced); |
| 1509 | } |
| 1510 | } else |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1511 | host_err = vfs_symlink(dentry->d_inode, dnew, path, mode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1512 | |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1513 | if (!host_err) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1514 | if (EX_ISSYNC(fhp->fh_export)) |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1515 | host_err = nfsd_sync_dir(dentry); |
| 1516 | } |
| 1517 | err = nfserrno(host_err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1518 | fh_unlock(fhp); |
| 1519 | |
| 1520 | cerr = fh_compose(resfhp, fhp->fh_export, dnew, fhp); |
| 1521 | dput(dnew); |
| 1522 | if (err==0) err = cerr; |
| 1523 | out: |
| 1524 | return err; |
| 1525 | |
| 1526 | out_nfserr: |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1527 | err = nfserrno(host_err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1528 | goto out; |
| 1529 | } |
| 1530 | |
| 1531 | /* |
| 1532 | * Create a hardlink |
| 1533 | * N.B. After this call _both_ ffhp and tfhp need an fh_put |
| 1534 | */ |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1535 | __be32 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1536 | nfsd_link(struct svc_rqst *rqstp, struct svc_fh *ffhp, |
| 1537 | char *name, int len, struct svc_fh *tfhp) |
| 1538 | { |
| 1539 | struct dentry *ddir, *dnew, *dold; |
| 1540 | struct inode *dirp, *dest; |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1541 | __be32 err; |
| 1542 | int host_err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1543 | |
| 1544 | err = fh_verify(rqstp, ffhp, S_IFDIR, MAY_CREATE); |
| 1545 | if (err) |
| 1546 | goto out; |
| 1547 | err = fh_verify(rqstp, tfhp, -S_IFDIR, MAY_NOP); |
| 1548 | if (err) |
| 1549 | goto out; |
| 1550 | |
| 1551 | err = nfserr_perm; |
| 1552 | if (!len) |
| 1553 | goto out; |
| 1554 | err = nfserr_exist; |
| 1555 | if (isdotent(name, len)) |
| 1556 | goto out; |
| 1557 | |
Peter Zijlstra | 12fd352 | 2006-10-02 02:18:03 -0700 | [diff] [blame] | 1558 | fh_lock_nested(ffhp, I_MUTEX_PARENT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1559 | ddir = ffhp->fh_dentry; |
| 1560 | dirp = ddir->d_inode; |
| 1561 | |
| 1562 | dnew = lookup_one_len(name, ddir, len); |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1563 | host_err = PTR_ERR(dnew); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1564 | if (IS_ERR(dnew)) |
| 1565 | goto out_nfserr; |
| 1566 | |
| 1567 | dold = tfhp->fh_dentry; |
| 1568 | dest = dold->d_inode; |
| 1569 | |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1570 | host_err = vfs_link(dold, dirp, dnew); |
| 1571 | if (!host_err) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1572 | if (EX_ISSYNC(ffhp->fh_export)) { |
NeilBrown | 45bd3b3 | 2006-01-18 17:43:50 -0800 | [diff] [blame] | 1573 | err = nfserrno(nfsd_sync_dir(ddir)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1574 | write_inode_now(dest, 1); |
| 1575 | } |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1576 | err = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1577 | } else { |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1578 | if (host_err == -EXDEV && rqstp->rq_vers == 2) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1579 | err = nfserr_acces; |
| 1580 | else |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1581 | err = nfserrno(host_err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1582 | } |
| 1583 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1584 | dput(dnew); |
David M. Richter | 270d56e | 2006-06-30 01:56:15 -0700 | [diff] [blame] | 1585 | out_unlock: |
| 1586 | fh_unlock(ffhp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1587 | out: |
| 1588 | return err; |
| 1589 | |
| 1590 | out_nfserr: |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1591 | err = nfserrno(host_err); |
David M. Richter | 270d56e | 2006-06-30 01:56:15 -0700 | [diff] [blame] | 1592 | goto out_unlock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1593 | } |
| 1594 | |
| 1595 | /* |
| 1596 | * Rename a file |
| 1597 | * N.B. After this call _both_ ffhp and tfhp need an fh_put |
| 1598 | */ |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1599 | __be32 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1600 | nfsd_rename(struct svc_rqst *rqstp, struct svc_fh *ffhp, char *fname, int flen, |
| 1601 | struct svc_fh *tfhp, char *tname, int tlen) |
| 1602 | { |
| 1603 | struct dentry *fdentry, *tdentry, *odentry, *ndentry, *trap; |
| 1604 | struct inode *fdir, *tdir; |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1605 | __be32 err; |
| 1606 | int host_err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1607 | |
| 1608 | err = fh_verify(rqstp, ffhp, S_IFDIR, MAY_REMOVE); |
| 1609 | if (err) |
| 1610 | goto out; |
| 1611 | err = fh_verify(rqstp, tfhp, S_IFDIR, MAY_CREATE); |
| 1612 | if (err) |
| 1613 | goto out; |
| 1614 | |
| 1615 | fdentry = ffhp->fh_dentry; |
| 1616 | fdir = fdentry->d_inode; |
| 1617 | |
| 1618 | tdentry = tfhp->fh_dentry; |
| 1619 | tdir = tdentry->d_inode; |
| 1620 | |
| 1621 | err = (rqstp->rq_vers == 2) ? nfserr_acces : nfserr_xdev; |
NeilBrown | a56f393 | 2006-06-30 01:56:10 -0700 | [diff] [blame] | 1622 | if (ffhp->fh_export != tfhp->fh_export) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1623 | goto out; |
| 1624 | |
| 1625 | err = nfserr_perm; |
| 1626 | if (!flen || isdotent(fname, flen) || !tlen || isdotent(tname, tlen)) |
| 1627 | goto out; |
| 1628 | |
| 1629 | /* cannot use fh_lock as we need deadlock protective ordering |
| 1630 | * so do it by hand */ |
| 1631 | trap = lock_rename(tdentry, fdentry); |
| 1632 | ffhp->fh_locked = tfhp->fh_locked = 1; |
| 1633 | fill_pre_wcc(ffhp); |
| 1634 | fill_pre_wcc(tfhp); |
| 1635 | |
| 1636 | odentry = lookup_one_len(fname, fdentry, flen); |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1637 | host_err = PTR_ERR(odentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1638 | if (IS_ERR(odentry)) |
| 1639 | goto out_nfserr; |
| 1640 | |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1641 | host_err = -ENOENT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1642 | if (!odentry->d_inode) |
| 1643 | goto out_dput_old; |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1644 | host_err = -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1645 | if (odentry == trap) |
| 1646 | goto out_dput_old; |
| 1647 | |
| 1648 | ndentry = lookup_one_len(tname, tdentry, tlen); |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1649 | host_err = PTR_ERR(ndentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1650 | if (IS_ERR(ndentry)) |
| 1651 | goto out_dput_old; |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1652 | host_err = -ENOTEMPTY; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1653 | if (ndentry == trap) |
| 1654 | goto out_dput_new; |
| 1655 | |
| 1656 | #ifdef MSNFS |
| 1657 | if ((ffhp->fh_export->ex_flags & NFSEXP_MSNFS) && |
| 1658 | ((atomic_read(&odentry->d_count) > 1) |
| 1659 | || (atomic_read(&ndentry->d_count) > 1))) { |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1660 | host_err = -EPERM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1661 | } else |
| 1662 | #endif |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1663 | host_err = vfs_rename(fdir, odentry, tdir, ndentry); |
| 1664 | if (!host_err && EX_ISSYNC(tfhp->fh_export)) { |
| 1665 | host_err = nfsd_sync_dir(tdentry); |
| 1666 | if (!host_err) |
| 1667 | host_err = nfsd_sync_dir(fdentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1668 | } |
| 1669 | |
| 1670 | out_dput_new: |
| 1671 | dput(ndentry); |
| 1672 | out_dput_old: |
| 1673 | dput(odentry); |
| 1674 | out_nfserr: |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1675 | err = nfserrno(host_err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1676 | |
| 1677 | /* we cannot reply on fh_unlock on the two filehandles, |
| 1678 | * as that would do the wrong thing if the two directories |
| 1679 | * were the same, so again we do it by hand |
| 1680 | */ |
| 1681 | fill_post_wcc(ffhp); |
| 1682 | fill_post_wcc(tfhp); |
| 1683 | unlock_rename(tdentry, fdentry); |
| 1684 | ffhp->fh_locked = tfhp->fh_locked = 0; |
| 1685 | |
| 1686 | out: |
| 1687 | return err; |
| 1688 | } |
| 1689 | |
| 1690 | /* |
| 1691 | * Unlink a file or directory |
| 1692 | * N.B. After this call fhp needs an fh_put |
| 1693 | */ |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1694 | __be32 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1695 | nfsd_unlink(struct svc_rqst *rqstp, struct svc_fh *fhp, int type, |
| 1696 | char *fname, int flen) |
| 1697 | { |
| 1698 | struct dentry *dentry, *rdentry; |
| 1699 | struct inode *dirp; |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1700 | __be32 err; |
| 1701 | int host_err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1702 | |
| 1703 | err = nfserr_acces; |
| 1704 | if (!flen || isdotent(fname, flen)) |
| 1705 | goto out; |
| 1706 | err = fh_verify(rqstp, fhp, S_IFDIR, MAY_REMOVE); |
| 1707 | if (err) |
| 1708 | goto out; |
| 1709 | |
Peter Zijlstra | 12fd352 | 2006-10-02 02:18:03 -0700 | [diff] [blame] | 1710 | fh_lock_nested(fhp, I_MUTEX_PARENT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1711 | dentry = fhp->fh_dentry; |
| 1712 | dirp = dentry->d_inode; |
| 1713 | |
| 1714 | rdentry = lookup_one_len(fname, dentry, flen); |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1715 | host_err = PTR_ERR(rdentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1716 | if (IS_ERR(rdentry)) |
| 1717 | goto out_nfserr; |
| 1718 | |
| 1719 | if (!rdentry->d_inode) { |
| 1720 | dput(rdentry); |
| 1721 | err = nfserr_noent; |
| 1722 | goto out; |
| 1723 | } |
| 1724 | |
| 1725 | if (!type) |
| 1726 | type = rdentry->d_inode->i_mode & S_IFMT; |
| 1727 | |
| 1728 | if (type != S_IFDIR) { /* It's UNLINK */ |
| 1729 | #ifdef MSNFS |
| 1730 | if ((fhp->fh_export->ex_flags & NFSEXP_MSNFS) && |
| 1731 | (atomic_read(&rdentry->d_count) > 1)) { |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1732 | host_err = -EPERM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1733 | } else |
| 1734 | #endif |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1735 | host_err = vfs_unlink(dirp, rdentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1736 | } else { /* It's RMDIR */ |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1737 | host_err = vfs_rmdir(dirp, rdentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1738 | } |
| 1739 | |
| 1740 | dput(rdentry); |
| 1741 | |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1742 | if (host_err) |
| 1743 | goto out_nfserr; |
| 1744 | if (EX_ISSYNC(fhp->fh_export)) |
| 1745 | host_err = nfsd_sync_dir(dentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1746 | |
| 1747 | out_nfserr: |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1748 | err = nfserrno(host_err); |
YAMAMOTO Takashi | f193fba | 2006-01-18 17:43:13 -0800 | [diff] [blame] | 1749 | out: |
| 1750 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1751 | } |
| 1752 | |
| 1753 | /* |
| 1754 | * Read entries from a directory. |
| 1755 | * The NFSv3/4 verifier we ignore for now. |
| 1756 | */ |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1757 | __be32 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1758 | nfsd_readdir(struct svc_rqst *rqstp, struct svc_fh *fhp, loff_t *offsetp, |
NeilBrown | a0ad13e | 2007-01-26 00:57:10 -0800 | [diff] [blame] | 1759 | struct readdir_cd *cdp, filldir_t func) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1760 | { |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1761 | __be32 err; |
| 1762 | int host_err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1763 | struct file *file; |
| 1764 | loff_t offset = *offsetp; |
| 1765 | |
| 1766 | err = nfsd_open(rqstp, fhp, S_IFDIR, MAY_READ, &file); |
| 1767 | if (err) |
| 1768 | goto out; |
| 1769 | |
| 1770 | offset = vfs_llseek(file, offset, 0); |
| 1771 | if (offset < 0) { |
| 1772 | err = nfserrno((int)offset); |
| 1773 | goto out_close; |
| 1774 | } |
| 1775 | |
| 1776 | /* |
| 1777 | * Read the directory entries. This silly loop is necessary because |
| 1778 | * readdir() is not guaranteed to fill up the entire buffer, but |
| 1779 | * may choose to do less. |
| 1780 | */ |
| 1781 | |
| 1782 | do { |
| 1783 | cdp->err = nfserr_eof; /* will be cleared on successful read */ |
NeilBrown | a0ad13e | 2007-01-26 00:57:10 -0800 | [diff] [blame] | 1784 | host_err = vfs_readdir(file, func, cdp); |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1785 | } while (host_err >=0 && cdp->err == nfs_ok); |
| 1786 | if (host_err) |
| 1787 | err = nfserrno(host_err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1788 | else |
| 1789 | err = cdp->err; |
| 1790 | *offsetp = vfs_llseek(file, 0, 1); |
| 1791 | |
| 1792 | if (err == nfserr_eof || err == nfserr_toosmall) |
| 1793 | err = nfs_ok; /* can still be found in ->err */ |
| 1794 | out_close: |
| 1795 | nfsd_close(file); |
| 1796 | out: |
| 1797 | return err; |
| 1798 | } |
| 1799 | |
| 1800 | /* |
| 1801 | * Get file system stats |
| 1802 | * N.B. After this call fhp needs an fh_put |
| 1803 | */ |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1804 | __be32 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1805 | nfsd_statfs(struct svc_rqst *rqstp, struct svc_fh *fhp, struct kstatfs *stat) |
| 1806 | { |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1807 | __be32 err = fh_verify(rqstp, fhp, 0, MAY_NOP); |
David Howells | 726c334 | 2006-06-23 02:02:58 -0700 | [diff] [blame] | 1808 | if (!err && vfs_statfs(fhp->fh_dentry,stat)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1809 | err = nfserr_io; |
| 1810 | return err; |
| 1811 | } |
| 1812 | |
J. Bruce Fields | c7d5140 | 2007-07-19 01:49:20 -0700 | [diff] [blame] | 1813 | static int exp_rdonly(struct svc_rqst *rqstp, struct svc_export *exp) |
J. Bruce Fields | e22841c | 2007-07-19 01:49:20 -0700 | [diff] [blame] | 1814 | { |
J. Bruce Fields | c7d5140 | 2007-07-19 01:49:20 -0700 | [diff] [blame] | 1815 | return nfsexp_flags(rqstp, exp) & NFSEXP_READONLY; |
J. Bruce Fields | e22841c | 2007-07-19 01:49:20 -0700 | [diff] [blame] | 1816 | } |
| 1817 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1818 | /* |
| 1819 | * Check for a user's access permissions to this inode. |
| 1820 | */ |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1821 | __be32 |
J. Bruce Fields | 0ec757d | 2007-07-17 04:04:48 -0700 | [diff] [blame] | 1822 | nfsd_permission(struct svc_rqst *rqstp, struct svc_export *exp, |
| 1823 | struct dentry *dentry, int acc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1824 | { |
| 1825 | struct inode *inode = dentry->d_inode; |
| 1826 | int err; |
| 1827 | |
| 1828 | if (acc == MAY_NOP) |
| 1829 | return 0; |
| 1830 | #if 0 |
| 1831 | dprintk("nfsd: permission 0x%x%s%s%s%s%s%s%s mode 0%o%s%s%s\n", |
| 1832 | acc, |
| 1833 | (acc & MAY_READ)? " read" : "", |
| 1834 | (acc & MAY_WRITE)? " write" : "", |
| 1835 | (acc & MAY_EXEC)? " exec" : "", |
| 1836 | (acc & MAY_SATTR)? " sattr" : "", |
| 1837 | (acc & MAY_TRUNC)? " trunc" : "", |
| 1838 | (acc & MAY_LOCK)? " lock" : "", |
| 1839 | (acc & MAY_OWNER_OVERRIDE)? " owneroverride" : "", |
| 1840 | inode->i_mode, |
| 1841 | IS_IMMUTABLE(inode)? " immut" : "", |
| 1842 | IS_APPEND(inode)? " append" : "", |
| 1843 | IS_RDONLY(inode)? " ro" : ""); |
| 1844 | dprintk(" owner %d/%d user %d/%d\n", |
| 1845 | inode->i_uid, inode->i_gid, current->fsuid, current->fsgid); |
| 1846 | #endif |
| 1847 | |
| 1848 | /* Normally we reject any write/sattr etc access on a read-only file |
| 1849 | * system. But if it is IRIX doing check on write-access for a |
| 1850 | * device special file, we ignore rofs. |
| 1851 | */ |
| 1852 | if (!(acc & MAY_LOCAL_ACCESS)) |
| 1853 | if (acc & (MAY_WRITE | MAY_SATTR | MAY_TRUNC)) { |
J. Bruce Fields | c7d5140 | 2007-07-19 01:49:20 -0700 | [diff] [blame] | 1854 | if (exp_rdonly(rqstp, exp) || IS_RDONLY(inode)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1855 | return nfserr_rofs; |
| 1856 | if (/* (acc & MAY_WRITE) && */ IS_IMMUTABLE(inode)) |
| 1857 | return nfserr_perm; |
| 1858 | } |
| 1859 | if ((acc & MAY_TRUNC) && IS_APPEND(inode)) |
| 1860 | return nfserr_perm; |
| 1861 | |
| 1862 | if (acc & MAY_LOCK) { |
| 1863 | /* If we cannot rely on authentication in NLM requests, |
| 1864 | * just allow locks, otherwise require read permission, or |
| 1865 | * ownership |
| 1866 | */ |
| 1867 | if (exp->ex_flags & NFSEXP_NOAUTHNLM) |
| 1868 | return 0; |
| 1869 | else |
| 1870 | acc = MAY_READ | MAY_OWNER_OVERRIDE; |
| 1871 | } |
| 1872 | /* |
| 1873 | * The file owner always gets access permission for accesses that |
| 1874 | * would normally be checked at open time. This is to make |
| 1875 | * file access work even when the client has done a fchmod(fd, 0). |
| 1876 | * |
| 1877 | * However, `cp foo bar' should fail nevertheless when bar is |
| 1878 | * readonly. A sensible way to do this might be to reject all |
| 1879 | * attempts to truncate a read-only file, because a creat() call |
| 1880 | * always implies file truncation. |
| 1881 | * ... but this isn't really fair. A process may reasonably call |
| 1882 | * ftruncate on an open file descriptor on a file with perm 000. |
| 1883 | * We must trust the client to do permission checking - using "ACCESS" |
| 1884 | * with NFSv3. |
| 1885 | */ |
| 1886 | if ((acc & MAY_OWNER_OVERRIDE) && |
| 1887 | inode->i_uid == current->fsuid) |
| 1888 | return 0; |
| 1889 | |
| 1890 | err = permission(inode, acc & (MAY_READ|MAY_WRITE|MAY_EXEC), NULL); |
| 1891 | |
| 1892 | /* Allow read access to binaries even when mode 111 */ |
| 1893 | if (err == -EACCES && S_ISREG(inode->i_mode) && |
| 1894 | acc == (MAY_READ | MAY_OWNER_OVERRIDE)) |
| 1895 | err = permission(inode, MAY_EXEC, NULL); |
| 1896 | |
| 1897 | return err? nfserrno(err) : 0; |
| 1898 | } |
| 1899 | |
| 1900 | void |
| 1901 | nfsd_racache_shutdown(void) |
| 1902 | { |
Greg Banks | fce1456 | 2006-10-04 02:15:49 -0700 | [diff] [blame] | 1903 | if (!raparml) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1904 | return; |
| 1905 | dprintk("nfsd: freeing readahead buffers.\n"); |
| 1906 | kfree(raparml); |
Greg Banks | fce1456 | 2006-10-04 02:15:49 -0700 | [diff] [blame] | 1907 | raparml = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1908 | } |
| 1909 | /* |
| 1910 | * Initialize readahead param cache |
| 1911 | */ |
| 1912 | int |
| 1913 | nfsd_racache_init(int cache_size) |
| 1914 | { |
| 1915 | int i; |
Greg Banks | fce1456 | 2006-10-04 02:15:49 -0700 | [diff] [blame] | 1916 | int j = 0; |
| 1917 | int nperbucket; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1918 | |
Greg Banks | fce1456 | 2006-10-04 02:15:49 -0700 | [diff] [blame] | 1919 | |
| 1920 | if (raparml) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1921 | return 0; |
Greg Banks | fce1456 | 2006-10-04 02:15:49 -0700 | [diff] [blame] | 1922 | if (cache_size < 2*RAPARM_HASH_SIZE) |
| 1923 | cache_size = 2*RAPARM_HASH_SIZE; |
Yan Burman | 4b3bb06 | 2006-12-08 02:39:41 -0800 | [diff] [blame] | 1924 | raparml = kcalloc(cache_size, sizeof(struct raparms), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1925 | |
Yan Burman | 4b3bb06 | 2006-12-08 02:39:41 -0800 | [diff] [blame] | 1926 | if (!raparml) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1927 | printk(KERN_WARNING |
Yan Burman | 4b3bb06 | 2006-12-08 02:39:41 -0800 | [diff] [blame] | 1928 | "nfsd: Could not allocate memory read-ahead cache.\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1929 | return -ENOMEM; |
| 1930 | } |
Yan Burman | 4b3bb06 | 2006-12-08 02:39:41 -0800 | [diff] [blame] | 1931 | |
| 1932 | dprintk("nfsd: allocating %d readahead buffers.\n", cache_size); |
| 1933 | for (i = 0 ; i < RAPARM_HASH_SIZE ; i++) { |
| 1934 | raparm_hash[i].pb_head = NULL; |
| 1935 | spin_lock_init(&raparm_hash[i].pb_lock); |
| 1936 | } |
J. Bruce Fields | a280df3 | 2007-07-19 01:49:18 -0700 | [diff] [blame] | 1937 | nperbucket = DIV_ROUND_UP(cache_size, RAPARM_HASH_SIZE); |
Yan Burman | 4b3bb06 | 2006-12-08 02:39:41 -0800 | [diff] [blame] | 1938 | for (i = 0; i < cache_size - 1; i++) { |
| 1939 | if (i % nperbucket == 0) |
| 1940 | raparm_hash[j++].pb_head = raparml + i; |
| 1941 | if (i % nperbucket < nperbucket-1) |
| 1942 | raparml[i].p_next = raparml + i + 1; |
| 1943 | } |
| 1944 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1945 | nfsdstats.ra_size = cache_size; |
| 1946 | return 0; |
| 1947 | } |
Andreas Gruenbacher | a257cdd | 2005-06-22 17:16:26 +0000 | [diff] [blame] | 1948 | |
| 1949 | #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) |
| 1950 | struct posix_acl * |
| 1951 | nfsd_get_posix_acl(struct svc_fh *fhp, int type) |
| 1952 | { |
| 1953 | struct inode *inode = fhp->fh_dentry->d_inode; |
| 1954 | char *name; |
| 1955 | void *value = NULL; |
| 1956 | ssize_t size; |
| 1957 | struct posix_acl *acl; |
| 1958 | |
Christoph Hellwig | 5be196e | 2006-01-09 20:51:55 -0800 | [diff] [blame] | 1959 | if (!IS_POSIXACL(inode)) |
Andreas Gruenbacher | a257cdd | 2005-06-22 17:16:26 +0000 | [diff] [blame] | 1960 | return ERR_PTR(-EOPNOTSUPP); |
Christoph Hellwig | 5be196e | 2006-01-09 20:51:55 -0800 | [diff] [blame] | 1961 | |
| 1962 | switch (type) { |
| 1963 | case ACL_TYPE_ACCESS: |
| 1964 | name = POSIX_ACL_XATTR_ACCESS; |
| 1965 | break; |
| 1966 | case ACL_TYPE_DEFAULT: |
| 1967 | name = POSIX_ACL_XATTR_DEFAULT; |
| 1968 | break; |
| 1969 | default: |
| 1970 | return ERR_PTR(-EOPNOTSUPP); |
Andreas Gruenbacher | a257cdd | 2005-06-22 17:16:26 +0000 | [diff] [blame] | 1971 | } |
| 1972 | |
Christoph Hellwig | 5be196e | 2006-01-09 20:51:55 -0800 | [diff] [blame] | 1973 | size = nfsd_getxattr(fhp->fh_dentry, name, &value); |
| 1974 | if (size < 0) |
| 1975 | return ERR_PTR(size); |
Andreas Gruenbacher | a257cdd | 2005-06-22 17:16:26 +0000 | [diff] [blame] | 1976 | |
Andreas Gruenbacher | a257cdd | 2005-06-22 17:16:26 +0000 | [diff] [blame] | 1977 | acl = posix_acl_from_xattr(value, size); |
Andreas Gruenbacher | a257cdd | 2005-06-22 17:16:26 +0000 | [diff] [blame] | 1978 | kfree(value); |
| 1979 | return acl; |
| 1980 | } |
| 1981 | |
| 1982 | int |
| 1983 | nfsd_set_posix_acl(struct svc_fh *fhp, int type, struct posix_acl *acl) |
| 1984 | { |
| 1985 | struct inode *inode = fhp->fh_dentry->d_inode; |
| 1986 | char *name; |
| 1987 | void *value = NULL; |
| 1988 | size_t size; |
| 1989 | int error; |
| 1990 | |
| 1991 | if (!IS_POSIXACL(inode) || !inode->i_op || |
| 1992 | !inode->i_op->setxattr || !inode->i_op->removexattr) |
| 1993 | return -EOPNOTSUPP; |
| 1994 | switch(type) { |
| 1995 | case ACL_TYPE_ACCESS: |
Christoph Hellwig | 334a13e | 2005-06-28 20:44:58 -0700 | [diff] [blame] | 1996 | name = POSIX_ACL_XATTR_ACCESS; |
Andreas Gruenbacher | a257cdd | 2005-06-22 17:16:26 +0000 | [diff] [blame] | 1997 | break; |
| 1998 | case ACL_TYPE_DEFAULT: |
Christoph Hellwig | 334a13e | 2005-06-28 20:44:58 -0700 | [diff] [blame] | 1999 | name = POSIX_ACL_XATTR_DEFAULT; |
Andreas Gruenbacher | a257cdd | 2005-06-22 17:16:26 +0000 | [diff] [blame] | 2000 | break; |
| 2001 | default: |
| 2002 | return -EOPNOTSUPP; |
| 2003 | } |
| 2004 | |
| 2005 | if (acl && acl->a_count) { |
Christoph Hellwig | 334a13e | 2005-06-28 20:44:58 -0700 | [diff] [blame] | 2006 | size = posix_acl_xattr_size(acl->a_count); |
Andreas Gruenbacher | a257cdd | 2005-06-22 17:16:26 +0000 | [diff] [blame] | 2007 | value = kmalloc(size, GFP_KERNEL); |
| 2008 | if (!value) |
| 2009 | return -ENOMEM; |
Florin Malita | 9ccfc29 | 2006-05-20 14:59:58 -0700 | [diff] [blame] | 2010 | error = posix_acl_to_xattr(acl, value, size); |
| 2011 | if (error < 0) |
Andreas Gruenbacher | a257cdd | 2005-06-22 17:16:26 +0000 | [diff] [blame] | 2012 | goto getout; |
Florin Malita | 9ccfc29 | 2006-05-20 14:59:58 -0700 | [diff] [blame] | 2013 | size = error; |
Andreas Gruenbacher | a257cdd | 2005-06-22 17:16:26 +0000 | [diff] [blame] | 2014 | } else |
| 2015 | size = 0; |
| 2016 | |
Andreas Gruenbacher | a257cdd | 2005-06-22 17:16:26 +0000 | [diff] [blame] | 2017 | if (size) |
Christoph Hellwig | 5be196e | 2006-01-09 20:51:55 -0800 | [diff] [blame] | 2018 | error = vfs_setxattr(fhp->fh_dentry, name, value, size, 0); |
Andreas Gruenbacher | a257cdd | 2005-06-22 17:16:26 +0000 | [diff] [blame] | 2019 | else { |
| 2020 | if (!S_ISDIR(inode->i_mode) && type == ACL_TYPE_DEFAULT) |
| 2021 | error = 0; |
| 2022 | else { |
Christoph Hellwig | 5be196e | 2006-01-09 20:51:55 -0800 | [diff] [blame] | 2023 | error = vfs_removexattr(fhp->fh_dentry, name); |
Andreas Gruenbacher | a257cdd | 2005-06-22 17:16:26 +0000 | [diff] [blame] | 2024 | if (error == -ENODATA) |
| 2025 | error = 0; |
| 2026 | } |
| 2027 | } |
| 2028 | |
| 2029 | getout: |
| 2030 | kfree(value); |
| 2031 | return error; |
| 2032 | } |
| 2033 | #endif /* defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) */ |