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 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 64 | /* |
| 65 | * This is a cache of readahead params that help us choose the proper |
| 66 | * readahead strategy. Initially, we set all readahead parameters to 0 |
| 67 | * and let the VFS handle things. |
| 68 | * If you increase the number of cached files very much, you'll need to |
| 69 | * add a hash table here. |
| 70 | */ |
| 71 | struct raparms { |
| 72 | struct raparms *p_next; |
| 73 | unsigned int p_count; |
| 74 | ino_t p_ino; |
| 75 | dev_t p_dev; |
| 76 | int p_set; |
| 77 | struct file_ra_state p_ra; |
Greg Banks | fce1456 | 2006-10-04 02:15:49 -0700 | [diff] [blame] | 78 | unsigned int p_hindex; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 79 | }; |
| 80 | |
Greg Banks | fce1456 | 2006-10-04 02:15:49 -0700 | [diff] [blame] | 81 | struct raparm_hbucket { |
| 82 | struct raparms *pb_head; |
| 83 | spinlock_t pb_lock; |
| 84 | } ____cacheline_aligned_in_smp; |
| 85 | |
Greg Banks | fce1456 | 2006-10-04 02:15:49 -0700 | [diff] [blame] | 86 | #define RAPARM_HASH_BITS 4 |
| 87 | #define RAPARM_HASH_SIZE (1<<RAPARM_HASH_BITS) |
| 88 | #define RAPARM_HASH_MASK (RAPARM_HASH_SIZE-1) |
| 89 | static struct raparm_hbucket raparm_hash[RAPARM_HASH_SIZE]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 90 | |
| 91 | /* |
| 92 | * Called from nfsd_lookup and encode_dirent. Check if we have crossed |
| 93 | * a mount point. |
J.Bruce Fields | e0bb89e | 2006-12-13 00:35:25 -0800 | [diff] [blame] | 94 | * Returns -EAGAIN or -ETIMEDOUT leaving *dpp and *expp unchanged, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 95 | * or nfs_ok having possibly changed *dpp and *expp |
| 96 | */ |
| 97 | int |
| 98 | nfsd_cross_mnt(struct svc_rqst *rqstp, struct dentry **dpp, |
| 99 | struct svc_export **expp) |
| 100 | { |
| 101 | struct svc_export *exp = *expp, *exp2 = NULL; |
| 102 | struct dentry *dentry = *dpp; |
Jan Blunck | 5477549 | 2008-02-14 19:38:39 -0800 | [diff] [blame] | 103 | struct vfsmount *mnt = mntget(exp->ex_path.mnt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 104 | struct dentry *mounts = dget(dentry); |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 105 | int err = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 106 | |
| 107 | while (follow_down(&mnt,&mounts)&&d_mountpoint(mounts)); |
| 108 | |
J. Bruce Fields | 0989a78 | 2007-07-17 04:04:44 -0700 | [diff] [blame] | 109 | exp2 = rqst_exp_get_by_name(rqstp, mnt, mounts); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 110 | if (IS_ERR(exp2)) { |
Neil Brown | a1033be | 2007-09-05 17:22:12 -0400 | [diff] [blame] | 111 | if (PTR_ERR(exp2) != -ENOENT) |
| 112 | err = PTR_ERR(exp2); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 113 | dput(mounts); |
| 114 | mntput(mnt); |
| 115 | goto out; |
| 116 | } |
J. Bruce Fields | 5d3dbbe | 2007-07-19 01:49:19 -0700 | [diff] [blame] | 117 | if ((exp->ex_flags & NFSEXP_CROSSMOUNT) || EX_NOHIDE(exp2)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 118 | /* successfully crossed mount point */ |
| 119 | exp_put(exp); |
| 120 | *expp = exp2; |
| 121 | dput(dentry); |
| 122 | *dpp = mounts; |
| 123 | } else { |
J. Bruce Fields | 5d3dbbe | 2007-07-19 01:49:19 -0700 | [diff] [blame] | 124 | exp_put(exp2); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 125 | dput(mounts); |
| 126 | } |
| 127 | mntput(mnt); |
| 128 | out: |
| 129 | return err; |
| 130 | } |
| 131 | |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 132 | __be32 |
J. Bruce Fields | 6c0a654 | 2007-07-17 04:04:47 -0700 | [diff] [blame] | 133 | nfsd_lookup_dentry(struct svc_rqst *rqstp, struct svc_fh *fhp, |
Chuck Lever | 5a022fc | 2007-11-01 16:57:09 -0400 | [diff] [blame] | 134 | const char *name, unsigned int len, |
J. Bruce Fields | 6c0a654 | 2007-07-17 04:04:47 -0700 | [diff] [blame] | 135 | struct svc_export **exp_ret, struct dentry **dentry_ret) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 136 | { |
| 137 | struct svc_export *exp; |
| 138 | struct dentry *dparent; |
| 139 | struct dentry *dentry; |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 140 | __be32 err; |
| 141 | int host_err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 142 | |
| 143 | dprintk("nfsd: nfsd_lookup(fh %s, %.*s)\n", SVCFH_fmt(fhp), len,name); |
| 144 | |
| 145 | /* Obtain dentry and export. */ |
Miklos Szeredi | 8837abc | 2008-06-16 13:20:29 +0200 | [diff] [blame] | 146 | err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_EXEC); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 147 | if (err) |
| 148 | return err; |
| 149 | |
| 150 | dparent = fhp->fh_dentry; |
| 151 | exp = fhp->fh_export; |
| 152 | exp_get(exp); |
| 153 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 154 | /* Lookup the name, but don't follow links */ |
| 155 | if (isdotent(name, len)) { |
| 156 | if (len==1) |
| 157 | dentry = dget(dparent); |
Jan Blunck | 5477549 | 2008-02-14 19:38:39 -0800 | [diff] [blame] | 158 | else if (dparent != exp->ex_path.dentry) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 159 | dentry = dget_parent(dparent); |
Jan Blunck | 5477549 | 2008-02-14 19:38:39 -0800 | [diff] [blame] | 160 | else if (!EX_NOHIDE(exp)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 161 | dentry = dget(dparent); /* .. == . just like at / */ |
| 162 | else { |
| 163 | /* checking mountpoint crossing is very different when stepping up */ |
| 164 | struct svc_export *exp2 = NULL; |
| 165 | struct dentry *dp; |
Jan Blunck | 5477549 | 2008-02-14 19:38:39 -0800 | [diff] [blame] | 166 | struct vfsmount *mnt = mntget(exp->ex_path.mnt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 167 | dentry = dget(dparent); |
| 168 | while(dentry == mnt->mnt_root && follow_up(&mnt, &dentry)) |
| 169 | ; |
| 170 | dp = dget_parent(dentry); |
| 171 | dput(dentry); |
| 172 | dentry = dp; |
| 173 | |
J. Bruce Fields | 0989a78 | 2007-07-17 04:04:44 -0700 | [diff] [blame] | 174 | exp2 = rqst_exp_parent(rqstp, mnt, dentry); |
J. Bruce Fields | 2d3bb25 | 2007-07-17 04:04:40 -0700 | [diff] [blame] | 175 | if (PTR_ERR(exp2) == -ENOENT) { |
| 176 | dput(dentry); |
| 177 | dentry = dget(dparent); |
| 178 | } else if (IS_ERR(exp2)) { |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 179 | host_err = PTR_ERR(exp2); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 180 | dput(dentry); |
| 181 | mntput(mnt); |
| 182 | goto out_nfserr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 183 | } else { |
| 184 | exp_put(exp); |
| 185 | exp = exp2; |
| 186 | } |
| 187 | mntput(mnt); |
| 188 | } |
| 189 | } else { |
| 190 | fh_lock(fhp); |
| 191 | dentry = lookup_one_len(name, dparent, len); |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 192 | host_err = PTR_ERR(dentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 193 | if (IS_ERR(dentry)) |
| 194 | goto out_nfserr; |
| 195 | /* |
| 196 | * check if we have crossed a mount point ... |
| 197 | */ |
| 198 | if (d_mountpoint(dentry)) { |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 199 | if ((host_err = nfsd_cross_mnt(rqstp, &dentry, &exp))) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 200 | dput(dentry); |
| 201 | goto out_nfserr; |
| 202 | } |
| 203 | } |
| 204 | } |
J. Bruce Fields | 6c0a654 | 2007-07-17 04:04:47 -0700 | [diff] [blame] | 205 | *dentry_ret = dentry; |
| 206 | *exp_ret = exp; |
| 207 | return 0; |
| 208 | |
| 209 | out_nfserr: |
| 210 | exp_put(exp); |
| 211 | return nfserrno(host_err); |
| 212 | } |
| 213 | |
| 214 | /* |
| 215 | * Look up one component of a pathname. |
| 216 | * N.B. After this call _both_ fhp and resfh need an fh_put |
| 217 | * |
| 218 | * If the lookup would cross a mountpoint, and the mounted filesystem |
| 219 | * is exported to the client with NFSEXP_NOHIDE, then the lookup is |
| 220 | * accepted as it stands and the mounted directory is |
| 221 | * returned. Otherwise the covered directory is returned. |
| 222 | * NOTE: this mountpoint crossing is not supported properly by all |
| 223 | * clients and is explicitly disallowed for NFSv3 |
| 224 | * NeilBrown <neilb@cse.unsw.edu.au> |
| 225 | */ |
| 226 | __be32 |
| 227 | nfsd_lookup(struct svc_rqst *rqstp, struct svc_fh *fhp, const char *name, |
Chuck Lever | 5a022fc | 2007-11-01 16:57:09 -0400 | [diff] [blame] | 228 | unsigned int len, struct svc_fh *resfh) |
J. Bruce Fields | 6c0a654 | 2007-07-17 04:04:47 -0700 | [diff] [blame] | 229 | { |
| 230 | struct svc_export *exp; |
| 231 | struct dentry *dentry; |
| 232 | __be32 err; |
| 233 | |
| 234 | err = nfsd_lookup_dentry(rqstp, fhp, name, len, &exp, &dentry); |
| 235 | if (err) |
| 236 | return err; |
Andy Adamson | 32c1eb0 | 2007-07-17 04:04:48 -0700 | [diff] [blame] | 237 | err = check_nfsd_access(exp, rqstp); |
| 238 | if (err) |
| 239 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 240 | /* |
| 241 | * Note: we compose the file handle now, but as the |
| 242 | * dentry may be negative, it may need to be updated. |
| 243 | */ |
| 244 | err = fh_compose(resfh, exp, dentry, fhp); |
| 245 | if (!err && !dentry->d_inode) |
| 246 | err = nfserr_noent; |
Andy Adamson | 32c1eb0 | 2007-07-17 04:04:48 -0700 | [diff] [blame] | 247 | out: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 248 | dput(dentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 249 | exp_put(exp); |
| 250 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 251 | } |
| 252 | |
J. Bruce Fields | 6c0a654 | 2007-07-17 04:04:47 -0700 | [diff] [blame] | 253 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 254 | /* |
| 255 | * Set various file attributes. |
| 256 | * N.B. After this call fhp needs an fh_put |
| 257 | */ |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 258 | __be32 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 259 | nfsd_setattr(struct svc_rqst *rqstp, struct svc_fh *fhp, struct iattr *iap, |
| 260 | int check_guard, time_t guardtime) |
| 261 | { |
| 262 | struct dentry *dentry; |
| 263 | struct inode *inode; |
Miklos Szeredi | 8837abc | 2008-06-16 13:20:29 +0200 | [diff] [blame] | 264 | int accmode = NFSD_MAY_SATTR; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 265 | int ftype = 0; |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 266 | __be32 err; |
| 267 | int host_err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 268 | int size_change = 0; |
| 269 | |
| 270 | if (iap->ia_valid & (ATTR_ATIME | ATTR_MTIME | ATTR_SIZE)) |
Miklos Szeredi | 8837abc | 2008-06-16 13:20:29 +0200 | [diff] [blame] | 271 | accmode |= NFSD_MAY_WRITE|NFSD_MAY_OWNER_OVERRIDE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 272 | if (iap->ia_valid & ATTR_SIZE) |
| 273 | ftype = S_IFREG; |
| 274 | |
| 275 | /* Get inode */ |
| 276 | err = fh_verify(rqstp, fhp, ftype, accmode); |
NeilBrown | 15b7a1b | 2005-11-07 01:00:23 -0800 | [diff] [blame] | 277 | if (err) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 278 | goto out; |
| 279 | |
| 280 | dentry = fhp->fh_dentry; |
| 281 | inode = dentry->d_inode; |
| 282 | |
NeilBrown | 15b7a1b | 2005-11-07 01:00:23 -0800 | [diff] [blame] | 283 | /* Ignore any mode updates on symlinks */ |
| 284 | if (S_ISLNK(inode->i_mode)) |
| 285 | iap->ia_valid &= ~ATTR_MODE; |
| 286 | |
| 287 | if (!iap->ia_valid) |
| 288 | goto out; |
| 289 | |
Christoph Hellwig | 9c85fca | 2007-03-07 15:26:25 +0000 | [diff] [blame] | 290 | /* |
| 291 | * NFSv2 does not differentiate between "set-[ac]time-to-now" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 292 | * which only requires access, and "set-[ac]time-to-X" which |
| 293 | * requires ownership. |
| 294 | * So if it looks like it might be "set both to the same time which |
| 295 | * is close to now", and if inode_change_ok fails, then we |
| 296 | * convert to "set to now" instead of "set to explicit time" |
| 297 | * |
| 298 | * We only call inode_change_ok as the last test as technically |
| 299 | * it is not an interface that we should be using. It is only |
| 300 | * valid if the filesystem does not define it's own i_op->setattr. |
| 301 | */ |
| 302 | #define BOTH_TIME_SET (ATTR_ATIME_SET | ATTR_MTIME_SET) |
| 303 | #define MAX_TOUCH_TIME_ERROR (30*60) |
Christoph Hellwig | 9c85fca | 2007-03-07 15:26:25 +0000 | [diff] [blame] | 304 | if ((iap->ia_valid & BOTH_TIME_SET) == BOTH_TIME_SET && |
| 305 | iap->ia_mtime.tv_sec == iap->ia_atime.tv_sec) { |
| 306 | /* |
| 307 | * Looks probable. |
| 308 | * |
| 309 | * Now just make sure time is in the right ballpark. |
| 310 | * Solaris, at least, doesn't seem to care what the time |
| 311 | * request is. We require it be within 30 minutes of now. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 312 | */ |
Christoph Hellwig | 9c85fca | 2007-03-07 15:26:25 +0000 | [diff] [blame] | 313 | time_t delta = iap->ia_atime.tv_sec - get_seconds(); |
| 314 | if (delta < 0) |
| 315 | delta = -delta; |
| 316 | if (delta < MAX_TOUCH_TIME_ERROR && |
| 317 | inode_change_ok(inode, iap) != 0) { |
| 318 | /* |
| 319 | * Turn off ATTR_[AM]TIME_SET but leave ATTR_[AM]TIME. |
| 320 | * This will cause notify_change to set these times |
| 321 | * to "now" |
| 322 | */ |
| 323 | iap->ia_valid &= ~BOTH_TIME_SET; |
| 324 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 325 | } |
| 326 | |
Christoph Hellwig | 9c85fca | 2007-03-07 15:26:25 +0000 | [diff] [blame] | 327 | /* |
| 328 | * The size case is special. |
| 329 | * It changes the file as well as the attributes. |
| 330 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 331 | if (iap->ia_valid & ATTR_SIZE) { |
| 332 | if (iap->ia_size < inode->i_size) { |
Miklos Szeredi | 8837abc | 2008-06-16 13:20:29 +0200 | [diff] [blame] | 333 | err = nfsd_permission(rqstp, fhp->fh_export, dentry, |
| 334 | NFSD_MAY_TRUNC|NFSD_MAY_OWNER_OVERRIDE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 335 | if (err) |
| 336 | goto out; |
| 337 | } |
| 338 | |
| 339 | /* |
| 340 | * If we are changing the size of the file, then |
| 341 | * we need to break all leases. |
| 342 | */ |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 343 | host_err = break_lease(inode, FMODE_WRITE | O_NONBLOCK); |
| 344 | if (host_err == -EWOULDBLOCK) |
| 345 | host_err = -ETIMEDOUT; |
| 346 | if (host_err) /* ENOMEM or EWOULDBLOCK */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 347 | goto out_nfserr; |
| 348 | |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 349 | host_err = get_write_access(inode); |
| 350 | if (host_err) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 351 | goto out_nfserr; |
| 352 | |
| 353 | size_change = 1; |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 354 | host_err = locks_verify_truncate(inode, NULL, iap->ia_size); |
| 355 | if (host_err) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 356 | put_write_access(inode); |
| 357 | goto out_nfserr; |
| 358 | } |
| 359 | DQUOT_INIT(inode); |
| 360 | } |
| 361 | |
Jeff Layton | ca45625 | 2008-04-16 16:28:47 -0400 | [diff] [blame] | 362 | /* sanitize the mode change */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 363 | if (iap->ia_valid & ATTR_MODE) { |
| 364 | iap->ia_mode &= S_IALLUGO; |
Jeff Layton | dee3209 | 2008-04-16 16:28:46 -0400 | [diff] [blame] | 365 | iap->ia_mode |= (inode->i_mode & ~S_IALLUGO); |
Jeff Layton | ca45625 | 2008-04-16 16:28:47 -0400 | [diff] [blame] | 366 | } |
| 367 | |
| 368 | /* Revoke setuid/setgid on chown */ |
| 369 | if (((iap->ia_valid & ATTR_UID) && iap->ia_uid != inode->i_uid) || |
| 370 | ((iap->ia_valid & ATTR_GID) && iap->ia_gid != inode->i_gid)) { |
| 371 | iap->ia_valid |= ATTR_KILL_PRIV; |
| 372 | if (iap->ia_valid & ATTR_MODE) { |
| 373 | /* we're setting mode too, just clear the s*id bits */ |
Jeff Layton | 8a0ce7d | 2007-10-18 03:05:19 -0700 | [diff] [blame] | 374 | iap->ia_mode &= ~S_ISUID; |
Jeff Layton | ca45625 | 2008-04-16 16:28:47 -0400 | [diff] [blame] | 375 | if (iap->ia_mode & S_IXGRP) |
| 376 | iap->ia_mode &= ~S_ISGID; |
| 377 | } else { |
| 378 | /* set ATTR_KILL_* bits and let VFS handle it */ |
| 379 | iap->ia_valid |= (ATTR_KILL_SUID | ATTR_KILL_SGID); |
Jeff Layton | 8a0ce7d | 2007-10-18 03:05:19 -0700 | [diff] [blame] | 380 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 381 | } |
| 382 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 383 | /* Change the attributes. */ |
| 384 | |
| 385 | iap->ia_valid |= ATTR_CTIME; |
| 386 | |
| 387 | err = nfserr_notsync; |
| 388 | if (!check_guard || guardtime == inode->i_ctime.tv_sec) { |
| 389 | fh_lock(fhp); |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 390 | host_err = notify_change(dentry, iap); |
| 391 | err = nfserrno(host_err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 392 | fh_unlock(fhp); |
| 393 | } |
| 394 | if (size_change) |
| 395 | put_write_access(inode); |
| 396 | if (!err) |
| 397 | if (EX_ISSYNC(fhp->fh_export)) |
| 398 | write_inode_now(inode, 1); |
| 399 | out: |
| 400 | return err; |
| 401 | |
| 402 | out_nfserr: |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 403 | err = nfserrno(host_err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 404 | goto out; |
| 405 | } |
| 406 | |
Christoph Hellwig | 5be196e | 2006-01-09 20:51:55 -0800 | [diff] [blame] | 407 | #if defined(CONFIG_NFSD_V2_ACL) || \ |
| 408 | defined(CONFIG_NFSD_V3_ACL) || \ |
| 409 | defined(CONFIG_NFSD_V4) |
| 410 | static ssize_t nfsd_getxattr(struct dentry *dentry, char *key, void **buf) |
| 411 | { |
| 412 | ssize_t buflen; |
Krishna Kumar | 6c6a426 | 2008-10-22 14:48:36 +0530 | [diff] [blame] | 413 | ssize_t ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 414 | |
Christoph Hellwig | 5be196e | 2006-01-09 20:51:55 -0800 | [diff] [blame] | 415 | buflen = vfs_getxattr(dentry, key, NULL, 0); |
| 416 | if (buflen <= 0) |
| 417 | return buflen; |
| 418 | |
| 419 | *buf = kmalloc(buflen, GFP_KERNEL); |
| 420 | if (!*buf) |
| 421 | return -ENOMEM; |
| 422 | |
Krishna Kumar | 6c6a426 | 2008-10-22 14:48:36 +0530 | [diff] [blame] | 423 | ret = vfs_getxattr(dentry, key, *buf, buflen); |
| 424 | if (ret < 0) |
| 425 | kfree(*buf); |
| 426 | return ret; |
Christoph Hellwig | 5be196e | 2006-01-09 20:51:55 -0800 | [diff] [blame] | 427 | } |
| 428 | #endif |
| 429 | |
| 430 | #if defined(CONFIG_NFSD_V4) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 431 | static int |
| 432 | set_nfsv4_acl_one(struct dentry *dentry, struct posix_acl *pacl, char *key) |
| 433 | { |
| 434 | int len; |
| 435 | size_t buflen; |
| 436 | char *buf = NULL; |
| 437 | int error = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 438 | |
| 439 | buflen = posix_acl_xattr_size(pacl->a_count); |
| 440 | buf = kmalloc(buflen, GFP_KERNEL); |
| 441 | error = -ENOMEM; |
| 442 | if (buf == NULL) |
| 443 | goto out; |
| 444 | |
| 445 | len = posix_acl_to_xattr(pacl, buf, buflen); |
| 446 | if (len < 0) { |
| 447 | error = len; |
| 448 | goto out; |
| 449 | } |
| 450 | |
Christoph Hellwig | 5be196e | 2006-01-09 20:51:55 -0800 | [diff] [blame] | 451 | error = vfs_setxattr(dentry, key, buf, len, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 452 | out: |
| 453 | kfree(buf); |
| 454 | return error; |
| 455 | } |
| 456 | |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 457 | __be32 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 458 | nfsd4_set_nfs4_acl(struct svc_rqst *rqstp, struct svc_fh *fhp, |
| 459 | struct nfs4_acl *acl) |
| 460 | { |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 461 | __be32 error; |
| 462 | int host_error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 463 | struct dentry *dentry; |
| 464 | struct inode *inode; |
| 465 | struct posix_acl *pacl = NULL, *dpacl = NULL; |
| 466 | unsigned int flags = 0; |
| 467 | |
| 468 | /* Get inode */ |
Miklos Szeredi | 8837abc | 2008-06-16 13:20:29 +0200 | [diff] [blame] | 469 | error = fh_verify(rqstp, fhp, 0 /* S_IFREG */, NFSD_MAY_SATTR); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 470 | if (error) |
J. Bruce Fields | 4b2ca38 | 2007-07-17 04:04:37 -0700 | [diff] [blame] | 471 | return error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 472 | |
| 473 | dentry = fhp->fh_dentry; |
| 474 | inode = dentry->d_inode; |
| 475 | if (S_ISDIR(inode->i_mode)) |
| 476 | flags = NFS4_ACL_DIR; |
| 477 | |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 478 | host_error = nfs4_acl_nfsv4_to_posix(acl, &pacl, &dpacl, flags); |
| 479 | if (host_error == -EINVAL) { |
J. Bruce Fields | 4b2ca38 | 2007-07-17 04:04:37 -0700 | [diff] [blame] | 480 | return nfserr_attrnotsupp; |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 481 | } else if (host_error < 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 482 | goto out_nfserr; |
| 483 | |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 484 | host_error = set_nfsv4_acl_one(dentry, pacl, POSIX_ACL_XATTR_ACCESS); |
| 485 | if (host_error < 0) |
J. Bruce Fields | 4b2ca38 | 2007-07-17 04:04:37 -0700 | [diff] [blame] | 486 | goto out_release; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 487 | |
J. Bruce Fields | 4b2ca38 | 2007-07-17 04:04:37 -0700 | [diff] [blame] | 488 | if (S_ISDIR(inode->i_mode)) |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 489 | host_error = set_nfsv4_acl_one(dentry, dpacl, POSIX_ACL_XATTR_DEFAULT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 490 | |
J. Bruce Fields | 4b2ca38 | 2007-07-17 04:04:37 -0700 | [diff] [blame] | 491 | out_release: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 492 | posix_acl_release(pacl); |
| 493 | posix_acl_release(dpacl); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 494 | out_nfserr: |
J. Bruce Fields | f34f924 | 2007-02-16 01:28:34 -0800 | [diff] [blame] | 495 | if (host_error == -EOPNOTSUPP) |
J. Bruce Fields | 4b2ca38 | 2007-07-17 04:04:37 -0700 | [diff] [blame] | 496 | return nfserr_attrnotsupp; |
J. Bruce Fields | f34f924 | 2007-02-16 01:28:34 -0800 | [diff] [blame] | 497 | else |
J. Bruce Fields | 4b2ca38 | 2007-07-17 04:04:37 -0700 | [diff] [blame] | 498 | return nfserrno(host_error); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 499 | } |
| 500 | |
| 501 | static struct posix_acl * |
| 502 | _get_posix_acl(struct dentry *dentry, char *key) |
| 503 | { |
Christoph Hellwig | 5be196e | 2006-01-09 20:51:55 -0800 | [diff] [blame] | 504 | void *buf = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 505 | struct posix_acl *pacl = NULL; |
Christoph Hellwig | 5be196e | 2006-01-09 20:51:55 -0800 | [diff] [blame] | 506 | int buflen; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 507 | |
Christoph Hellwig | 5be196e | 2006-01-09 20:51:55 -0800 | [diff] [blame] | 508 | buflen = nfsd_getxattr(dentry, key, &buf); |
| 509 | if (!buflen) |
| 510 | buflen = -ENODATA; |
| 511 | if (buflen <= 0) |
| 512 | return ERR_PTR(buflen); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 513 | |
| 514 | pacl = posix_acl_from_xattr(buf, buflen); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 515 | kfree(buf); |
| 516 | return pacl; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 517 | } |
| 518 | |
| 519 | int |
| 520 | nfsd4_get_nfs4_acl(struct svc_rqst *rqstp, struct dentry *dentry, struct nfs4_acl **acl) |
| 521 | { |
| 522 | struct inode *inode = dentry->d_inode; |
| 523 | int error = 0; |
| 524 | struct posix_acl *pacl = NULL, *dpacl = NULL; |
| 525 | unsigned int flags = 0; |
| 526 | |
Christoph Hellwig | 9a59f45 | 2005-06-23 00:10:19 -0700 | [diff] [blame] | 527 | pacl = _get_posix_acl(dentry, POSIX_ACL_XATTR_ACCESS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 528 | if (IS_ERR(pacl) && PTR_ERR(pacl) == -ENODATA) |
| 529 | pacl = posix_acl_from_mode(inode->i_mode, GFP_KERNEL); |
| 530 | if (IS_ERR(pacl)) { |
| 531 | error = PTR_ERR(pacl); |
| 532 | pacl = NULL; |
| 533 | goto out; |
| 534 | } |
| 535 | |
| 536 | if (S_ISDIR(inode->i_mode)) { |
Christoph Hellwig | 9a59f45 | 2005-06-23 00:10:19 -0700 | [diff] [blame] | 537 | dpacl = _get_posix_acl(dentry, POSIX_ACL_XATTR_DEFAULT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 538 | if (IS_ERR(dpacl) && PTR_ERR(dpacl) == -ENODATA) |
| 539 | dpacl = NULL; |
| 540 | else if (IS_ERR(dpacl)) { |
| 541 | error = PTR_ERR(dpacl); |
| 542 | dpacl = NULL; |
| 543 | goto out; |
| 544 | } |
| 545 | flags = NFS4_ACL_DIR; |
| 546 | } |
| 547 | |
| 548 | *acl = nfs4_acl_posix_to_nfsv4(pacl, dpacl, flags); |
| 549 | if (IS_ERR(*acl)) { |
| 550 | error = PTR_ERR(*acl); |
| 551 | *acl = NULL; |
| 552 | } |
| 553 | out: |
| 554 | posix_acl_release(pacl); |
| 555 | posix_acl_release(dpacl); |
| 556 | return error; |
| 557 | } |
| 558 | |
| 559 | #endif /* defined(CONFIG_NFS_V4) */ |
| 560 | |
| 561 | #ifdef CONFIG_NFSD_V3 |
| 562 | /* |
| 563 | * Check server access rights to a file system object |
| 564 | */ |
| 565 | struct accessmap { |
| 566 | u32 access; |
| 567 | int how; |
| 568 | }; |
| 569 | static struct accessmap nfs3_regaccess[] = { |
Miklos Szeredi | 8837abc | 2008-06-16 13:20:29 +0200 | [diff] [blame] | 570 | { NFS3_ACCESS_READ, NFSD_MAY_READ }, |
| 571 | { NFS3_ACCESS_EXECUTE, NFSD_MAY_EXEC }, |
| 572 | { NFS3_ACCESS_MODIFY, NFSD_MAY_WRITE|NFSD_MAY_TRUNC }, |
| 573 | { NFS3_ACCESS_EXTEND, NFSD_MAY_WRITE }, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 574 | |
| 575 | { 0, 0 } |
| 576 | }; |
| 577 | |
| 578 | static struct accessmap nfs3_diraccess[] = { |
Miklos Szeredi | 8837abc | 2008-06-16 13:20:29 +0200 | [diff] [blame] | 579 | { NFS3_ACCESS_READ, NFSD_MAY_READ }, |
| 580 | { NFS3_ACCESS_LOOKUP, NFSD_MAY_EXEC }, |
| 581 | { NFS3_ACCESS_MODIFY, NFSD_MAY_EXEC|NFSD_MAY_WRITE|NFSD_MAY_TRUNC}, |
| 582 | { NFS3_ACCESS_EXTEND, NFSD_MAY_EXEC|NFSD_MAY_WRITE }, |
| 583 | { NFS3_ACCESS_DELETE, NFSD_MAY_REMOVE }, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 584 | |
| 585 | { 0, 0 } |
| 586 | }; |
| 587 | |
| 588 | static struct accessmap nfs3_anyaccess[] = { |
| 589 | /* Some clients - Solaris 2.6 at least, make an access call |
| 590 | * to the server to check for access for things like /dev/null |
| 591 | * (which really, the server doesn't care about). So |
| 592 | * We provide simple access checking for them, looking |
| 593 | * mainly at mode bits, and we make sure to ignore read-only |
| 594 | * filesystem checks |
| 595 | */ |
Miklos Szeredi | 8837abc | 2008-06-16 13:20:29 +0200 | [diff] [blame] | 596 | { NFS3_ACCESS_READ, NFSD_MAY_READ }, |
| 597 | { NFS3_ACCESS_EXECUTE, NFSD_MAY_EXEC }, |
| 598 | { NFS3_ACCESS_MODIFY, NFSD_MAY_WRITE|NFSD_MAY_LOCAL_ACCESS }, |
| 599 | { NFS3_ACCESS_EXTEND, NFSD_MAY_WRITE|NFSD_MAY_LOCAL_ACCESS }, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 600 | |
| 601 | { 0, 0 } |
| 602 | }; |
| 603 | |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 604 | __be32 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 605 | nfsd_access(struct svc_rqst *rqstp, struct svc_fh *fhp, u32 *access, u32 *supported) |
| 606 | { |
| 607 | struct accessmap *map; |
| 608 | struct svc_export *export; |
| 609 | struct dentry *dentry; |
| 610 | u32 query, result = 0, sresult = 0; |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 611 | __be32 error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 612 | |
Miklos Szeredi | 8837abc | 2008-06-16 13:20:29 +0200 | [diff] [blame] | 613 | error = fh_verify(rqstp, fhp, 0, NFSD_MAY_NOP); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 614 | if (error) |
| 615 | goto out; |
| 616 | |
| 617 | export = fhp->fh_export; |
| 618 | dentry = fhp->fh_dentry; |
| 619 | |
| 620 | if (S_ISREG(dentry->d_inode->i_mode)) |
| 621 | map = nfs3_regaccess; |
| 622 | else if (S_ISDIR(dentry->d_inode->i_mode)) |
| 623 | map = nfs3_diraccess; |
| 624 | else |
| 625 | map = nfs3_anyaccess; |
| 626 | |
| 627 | |
| 628 | query = *access; |
| 629 | for (; map->access; map++) { |
| 630 | if (map->access & query) { |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 631 | __be32 err2; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 632 | |
| 633 | sresult |= map->access; |
| 634 | |
J. Bruce Fields | 0ec757d | 2007-07-17 04:04:48 -0700 | [diff] [blame] | 635 | err2 = nfsd_permission(rqstp, export, dentry, map->how); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 636 | switch (err2) { |
| 637 | case nfs_ok: |
| 638 | result |= map->access; |
| 639 | break; |
| 640 | |
| 641 | /* the following error codes just mean the access was not allowed, |
| 642 | * rather than an error occurred */ |
| 643 | case nfserr_rofs: |
| 644 | case nfserr_acces: |
| 645 | case nfserr_perm: |
| 646 | /* simply don't "or" in the access bit. */ |
| 647 | break; |
| 648 | default: |
| 649 | error = err2; |
| 650 | goto out; |
| 651 | } |
| 652 | } |
| 653 | } |
| 654 | *access = result; |
| 655 | if (supported) |
| 656 | *supported = sresult; |
| 657 | |
| 658 | out: |
| 659 | return error; |
| 660 | } |
| 661 | #endif /* CONFIG_NFSD_V3 */ |
| 662 | |
| 663 | |
| 664 | |
| 665 | /* |
| 666 | * Open an existing file or directory. |
| 667 | * The access argument indicates the type of open (read/write/lock) |
| 668 | * N.B. After this call fhp needs an fh_put |
| 669 | */ |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 670 | __be32 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 671 | nfsd_open(struct svc_rqst *rqstp, struct svc_fh *fhp, int type, |
| 672 | int access, struct file **filp) |
| 673 | { |
David Howells | 745ca24 | 2008-11-14 10:39:22 +1100 | [diff] [blame] | 674 | const struct cred *cred = current_cred(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 675 | struct dentry *dentry; |
| 676 | struct inode *inode; |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 677 | int flags = O_RDONLY|O_LARGEFILE; |
| 678 | __be32 err; |
| 679 | int host_err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 680 | |
| 681 | /* |
| 682 | * If we get here, then the client has already done an "open", |
| 683 | * and (hopefully) checked permission - so allow OWNER_OVERRIDE |
| 684 | * in case a chmod has now revoked permission. |
| 685 | */ |
Miklos Szeredi | 8837abc | 2008-06-16 13:20:29 +0200 | [diff] [blame] | 686 | err = fh_verify(rqstp, fhp, type, access | NFSD_MAY_OWNER_OVERRIDE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 687 | if (err) |
| 688 | goto out; |
| 689 | |
| 690 | dentry = fhp->fh_dentry; |
| 691 | inode = dentry->d_inode; |
| 692 | |
| 693 | /* Disallow write access to files with the append-only bit set |
| 694 | * or any access when mandatory locking enabled |
| 695 | */ |
| 696 | err = nfserr_perm; |
Miklos Szeredi | 8837abc | 2008-06-16 13:20:29 +0200 | [diff] [blame] | 697 | if (IS_APPEND(inode) && (access & NFSD_MAY_WRITE)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 698 | goto out; |
J. Bruce Fields | 5e7fc43 | 2007-10-02 14:18:12 -0400 | [diff] [blame] | 699 | /* |
| 700 | * We must ignore files (but only files) which might have mandatory |
| 701 | * locks on them because there is no way to know if the accesser has |
| 702 | * the lock. |
| 703 | */ |
| 704 | if (S_ISREG((inode)->i_mode) && mandatory_lock(inode)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 705 | goto out; |
| 706 | |
| 707 | if (!inode->i_fop) |
| 708 | goto out; |
| 709 | |
| 710 | /* |
| 711 | * Check to see if there are any leases on this file. |
| 712 | * This may block while leases are broken. |
| 713 | */ |
Miklos Szeredi | 8837abc | 2008-06-16 13:20:29 +0200 | [diff] [blame] | 714 | host_err = break_lease(inode, O_NONBLOCK | ((access & NFSD_MAY_WRITE) ? FMODE_WRITE : 0)); |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 715 | if (host_err == -EWOULDBLOCK) |
| 716 | host_err = -ETIMEDOUT; |
| 717 | if (host_err) /* NOMEM or WOULDBLOCK */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 718 | goto out_nfserr; |
| 719 | |
Miklos Szeredi | 8837abc | 2008-06-16 13:20:29 +0200 | [diff] [blame] | 720 | if (access & NFSD_MAY_WRITE) { |
| 721 | if (access & NFSD_MAY_READ) |
J. Bruce Fields | 9ecb6a0 | 2006-06-30 01:56:17 -0700 | [diff] [blame] | 722 | flags = O_RDWR|O_LARGEFILE; |
| 723 | else |
| 724 | flags = O_WRONLY|O_LARGEFILE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 725 | |
| 726 | DQUOT_INIT(inode); |
| 727 | } |
Jan Blunck | 5477549 | 2008-02-14 19:38:39 -0800 | [diff] [blame] | 728 | *filp = dentry_open(dget(dentry), mntget(fhp->fh_export->ex_path.mnt), |
David Howells | 745ca24 | 2008-11-14 10:39:22 +1100 | [diff] [blame] | 729 | flags, cred); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 730 | if (IS_ERR(*filp)) |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 731 | host_err = PTR_ERR(*filp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 732 | out_nfserr: |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 733 | err = nfserrno(host_err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 734 | out: |
| 735 | return err; |
| 736 | } |
| 737 | |
| 738 | /* |
| 739 | * Close a file. |
| 740 | */ |
| 741 | void |
| 742 | nfsd_close(struct file *filp) |
| 743 | { |
| 744 | fput(filp); |
| 745 | } |
| 746 | |
David Shaw | a334de2 | 2006-01-06 00:19:58 -0800 | [diff] [blame] | 747 | static int |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 748 | nfsd_sync(struct file *filp) |
| 749 | { |
Christoph Hellwig | 4c728ef | 2008-12-22 21:11:15 +0100 | [diff] [blame^] | 750 | return vfs_fsync(filp, filp->f_path.dentry, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 751 | } |
| 752 | |
YAMAMOTO Takashi | f193fba | 2006-01-18 17:43:13 -0800 | [diff] [blame] | 753 | int |
Christoph Hellwig | 4c728ef | 2008-12-22 21:11:15 +0100 | [diff] [blame^] | 754 | nfsd_sync_dir(struct dentry *dentry) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 755 | { |
Christoph Hellwig | 4c728ef | 2008-12-22 21:11:15 +0100 | [diff] [blame^] | 756 | return vfs_fsync(NULL, dentry, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 757 | } |
| 758 | |
| 759 | /* |
| 760 | * Obtain the readahead parameters for the file |
| 761 | * specified by (dev, ino). |
| 762 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 763 | |
| 764 | static inline struct raparms * |
| 765 | nfsd_get_raparms(dev_t dev, ino_t ino) |
| 766 | { |
| 767 | struct raparms *ra, **rap, **frap = NULL; |
| 768 | int depth = 0; |
Greg Banks | fce1456 | 2006-10-04 02:15:49 -0700 | [diff] [blame] | 769 | unsigned int hash; |
| 770 | struct raparm_hbucket *rab; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 771 | |
Greg Banks | fce1456 | 2006-10-04 02:15:49 -0700 | [diff] [blame] | 772 | hash = jhash_2words(dev, ino, 0xfeedbeef) & RAPARM_HASH_MASK; |
| 773 | rab = &raparm_hash[hash]; |
| 774 | |
| 775 | spin_lock(&rab->pb_lock); |
| 776 | for (rap = &rab->pb_head; (ra = *rap); rap = &ra->p_next) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 777 | if (ra->p_ino == ino && ra->p_dev == dev) |
| 778 | goto found; |
| 779 | depth++; |
| 780 | if (ra->p_count == 0) |
| 781 | frap = rap; |
| 782 | } |
| 783 | depth = nfsdstats.ra_size*11/10; |
| 784 | if (!frap) { |
Greg Banks | fce1456 | 2006-10-04 02:15:49 -0700 | [diff] [blame] | 785 | spin_unlock(&rab->pb_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 786 | return NULL; |
| 787 | } |
| 788 | rap = frap; |
| 789 | ra = *frap; |
| 790 | ra->p_dev = dev; |
| 791 | ra->p_ino = ino; |
| 792 | ra->p_set = 0; |
Greg Banks | fce1456 | 2006-10-04 02:15:49 -0700 | [diff] [blame] | 793 | ra->p_hindex = hash; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 794 | found: |
Greg Banks | fce1456 | 2006-10-04 02:15:49 -0700 | [diff] [blame] | 795 | if (rap != &rab->pb_head) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 796 | *rap = ra->p_next; |
Greg Banks | fce1456 | 2006-10-04 02:15:49 -0700 | [diff] [blame] | 797 | ra->p_next = rab->pb_head; |
| 798 | rab->pb_head = ra; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 799 | } |
| 800 | ra->p_count++; |
| 801 | nfsdstats.ra_depth[depth*10/nfsdstats.ra_size]++; |
Greg Banks | fce1456 | 2006-10-04 02:15:49 -0700 | [diff] [blame] | 802 | spin_unlock(&rab->pb_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 803 | return ra; |
| 804 | } |
| 805 | |
| 806 | /* |
Jens Axboe | cf8208d | 2007-06-12 21:22:14 +0200 | [diff] [blame] | 807 | * Grab and keep cached pages associated with a file in the svc_rqst |
| 808 | * so that they can be passed to the network sendmsg/sendpage routines |
| 809 | * directly. They will be released after the sending has completed. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 810 | */ |
| 811 | static int |
Jens Axboe | cf8208d | 2007-06-12 21:22:14 +0200 | [diff] [blame] | 812 | nfsd_splice_actor(struct pipe_inode_info *pipe, struct pipe_buffer *buf, |
| 813 | struct splice_desc *sd) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 814 | { |
Jens Axboe | cf8208d | 2007-06-12 21:22:14 +0200 | [diff] [blame] | 815 | struct svc_rqst *rqstp = sd->u.data; |
NeilBrown | 4452435 | 2006-10-04 02:15:46 -0700 | [diff] [blame] | 816 | struct page **pp = rqstp->rq_respages + rqstp->rq_resused; |
Jens Axboe | cf8208d | 2007-06-12 21:22:14 +0200 | [diff] [blame] | 817 | struct page *page = buf->page; |
| 818 | size_t size; |
| 819 | int ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 820 | |
Jens Axboe | cac36bb | 2007-06-14 13:10:48 +0200 | [diff] [blame] | 821 | ret = buf->ops->confirm(pipe, buf); |
Jens Axboe | cf8208d | 2007-06-12 21:22:14 +0200 | [diff] [blame] | 822 | if (unlikely(ret)) |
| 823 | return ret; |
| 824 | |
| 825 | size = sd->len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 826 | |
| 827 | if (rqstp->rq_res.page_len == 0) { |
| 828 | get_page(page); |
NeilBrown | 4452435 | 2006-10-04 02:15:46 -0700 | [diff] [blame] | 829 | put_page(*pp); |
| 830 | *pp = page; |
| 831 | rqstp->rq_resused++; |
Jens Axboe | cf8208d | 2007-06-12 21:22:14 +0200 | [diff] [blame] | 832 | rqstp->rq_res.page_base = buf->offset; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 833 | rqstp->rq_res.page_len = size; |
NeilBrown | 4452435 | 2006-10-04 02:15:46 -0700 | [diff] [blame] | 834 | } else if (page != pp[-1]) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 835 | get_page(page); |
NeilBrown | 250f391 | 2007-01-26 00:56:59 -0800 | [diff] [blame] | 836 | if (*pp) |
| 837 | put_page(*pp); |
NeilBrown | 4452435 | 2006-10-04 02:15:46 -0700 | [diff] [blame] | 838 | *pp = page; |
| 839 | rqstp->rq_resused++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 840 | rqstp->rq_res.page_len += size; |
NeilBrown | 4452435 | 2006-10-04 02:15:46 -0700 | [diff] [blame] | 841 | } else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 842 | rqstp->rq_res.page_len += size; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 843 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 844 | return size; |
| 845 | } |
| 846 | |
Jens Axboe | cf8208d | 2007-06-12 21:22:14 +0200 | [diff] [blame] | 847 | static int nfsd_direct_splice_actor(struct pipe_inode_info *pipe, |
| 848 | struct splice_desc *sd) |
| 849 | { |
| 850 | return __splice_from_pipe(pipe, sd, nfsd_splice_actor); |
| 851 | } |
| 852 | |
Dave Hansen | a8754be | 2007-10-16 23:31:15 -0700 | [diff] [blame] | 853 | static inline int svc_msnfs(struct svc_fh *ffhp) |
| 854 | { |
| 855 | #ifdef MSNFS |
| 856 | return (ffhp->fh_export->ex_flags & NFSEXP_MSNFS); |
| 857 | #else |
| 858 | return 0; |
| 859 | #endif |
| 860 | } |
| 861 | |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 862 | static __be32 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 863 | nfsd_vfs_read(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file, |
| 864 | loff_t offset, struct kvec *vec, int vlen, unsigned long *count) |
| 865 | { |
| 866 | struct inode *inode; |
| 867 | struct raparms *ra; |
| 868 | mm_segment_t oldfs; |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 869 | __be32 err; |
| 870 | int host_err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 871 | |
| 872 | err = nfserr_perm; |
Josef "Jeff" Sipek | 7eaa36e | 2006-12-08 02:36:41 -0800 | [diff] [blame] | 873 | inode = file->f_path.dentry->d_inode; |
Dave Hansen | a8754be | 2007-10-16 23:31:15 -0700 | [diff] [blame] | 874 | |
| 875 | if (svc_msnfs(fhp) && !lock_may_read(inode, offset, *count)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 876 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 877 | |
| 878 | /* Get readahead parameters */ |
| 879 | ra = nfsd_get_raparms(inode->i_sb->s_dev, inode->i_ino); |
| 880 | |
| 881 | if (ra && ra->p_set) |
| 882 | file->f_ra = ra->p_ra; |
| 883 | |
Jens Axboe | cf8208d | 2007-06-12 21:22:14 +0200 | [diff] [blame] | 884 | if (file->f_op->splice_read && rqstp->rq_splice_ok) { |
| 885 | struct splice_desc sd = { |
| 886 | .len = 0, |
| 887 | .total_len = *count, |
| 888 | .pos = offset, |
| 889 | .u.data = rqstp, |
| 890 | }; |
| 891 | |
Jens Axboe | 4fbef20 | 2007-07-13 22:42:20 +0200 | [diff] [blame] | 892 | rqstp->rq_resused = 1; |
Jens Axboe | cf8208d | 2007-06-12 21:22:14 +0200 | [diff] [blame] | 893 | host_err = splice_direct_to_actor(file, &sd, nfsd_direct_splice_actor); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 894 | } else { |
| 895 | oldfs = get_fs(); |
| 896 | set_fs(KERNEL_DS); |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 897 | host_err = vfs_readv(file, (struct iovec __user *)vec, vlen, &offset); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 898 | set_fs(oldfs); |
| 899 | } |
| 900 | |
| 901 | /* Write back readahead params */ |
| 902 | if (ra) { |
Greg Banks | fce1456 | 2006-10-04 02:15:49 -0700 | [diff] [blame] | 903 | struct raparm_hbucket *rab = &raparm_hash[ra->p_hindex]; |
| 904 | spin_lock(&rab->pb_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 905 | ra->p_ra = file->f_ra; |
| 906 | ra->p_set = 1; |
| 907 | ra->p_count--; |
Greg Banks | fce1456 | 2006-10-04 02:15:49 -0700 | [diff] [blame] | 908 | spin_unlock(&rab->pb_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 909 | } |
| 910 | |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 911 | if (host_err >= 0) { |
| 912 | nfsdstats.io_read += host_err; |
| 913 | *count = host_err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 914 | err = 0; |
Josef "Jeff" Sipek | 7eaa36e | 2006-12-08 02:36:41 -0800 | [diff] [blame] | 915 | fsnotify_access(file->f_path.dentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 916 | } else |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 917 | err = nfserrno(host_err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 918 | out: |
| 919 | return err; |
| 920 | } |
| 921 | |
Neil Brown | 9f708e4 | 2006-01-06 00:19:59 -0800 | [diff] [blame] | 922 | static void kill_suid(struct dentry *dentry) |
| 923 | { |
| 924 | struct iattr ia; |
Serge E. Hallyn | b537677 | 2007-10-16 23:31:36 -0700 | [diff] [blame] | 925 | ia.ia_valid = ATTR_KILL_SUID | ATTR_KILL_SGID | ATTR_KILL_PRIV; |
Neil Brown | 9f708e4 | 2006-01-06 00:19:59 -0800 | [diff] [blame] | 926 | |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 927 | mutex_lock(&dentry->d_inode->i_mutex); |
Neil Brown | 9f708e4 | 2006-01-06 00:19:59 -0800 | [diff] [blame] | 928 | notify_change(dentry, &ia); |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 929 | mutex_unlock(&dentry->d_inode->i_mutex); |
Neil Brown | 9f708e4 | 2006-01-06 00:19:59 -0800 | [diff] [blame] | 930 | } |
| 931 | |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 932 | static __be32 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 933 | nfsd_vfs_write(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file, |
| 934 | loff_t offset, struct kvec *vec, int vlen, |
| 935 | unsigned long cnt, int *stablep) |
| 936 | { |
| 937 | struct svc_export *exp; |
| 938 | struct dentry *dentry; |
| 939 | struct inode *inode; |
| 940 | mm_segment_t oldfs; |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 941 | __be32 err = 0; |
| 942 | int host_err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 943 | int stable = *stablep; |
| 944 | |
NeilBrown | 45bd3b3 | 2006-01-18 17:43:50 -0800 | [diff] [blame] | 945 | #ifdef MSNFS |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 946 | err = nfserr_perm; |
| 947 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 948 | if ((fhp->fh_export->ex_flags & NFSEXP_MSNFS) && |
Josef "Jeff" Sipek | 7eaa36e | 2006-12-08 02:36:41 -0800 | [diff] [blame] | 949 | (!lock_may_write(file->f_path.dentry->d_inode, offset, cnt))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 950 | goto out; |
| 951 | #endif |
| 952 | |
Josef "Jeff" Sipek | 7eaa36e | 2006-12-08 02:36:41 -0800 | [diff] [blame] | 953 | dentry = file->f_path.dentry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 954 | inode = dentry->d_inode; |
| 955 | exp = fhp->fh_export; |
| 956 | |
| 957 | /* |
| 958 | * Request sync writes if |
| 959 | * - the sync export option has been set, or |
| 960 | * - the client requested O_SYNC behavior (NFSv3 feature). |
| 961 | * - The file system doesn't support fsync(). |
| 962 | * When gathered writes have been configured for this volume, |
| 963 | * flushing the data to disk is handled separately below. |
| 964 | */ |
| 965 | |
Harvey Harrison | 3ba1514 | 2008-02-20 12:49:02 -0800 | [diff] [blame] | 966 | if (!file->f_op->fsync) {/* COMMIT3 cannot work */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 967 | stable = 2; |
| 968 | *stablep = 2; /* FILE_SYNC */ |
| 969 | } |
| 970 | |
| 971 | if (!EX_ISSYNC(exp)) |
| 972 | stable = 0; |
| 973 | if (stable && !EX_WGATHER(exp)) |
| 974 | file->f_flags |= O_SYNC; |
| 975 | |
| 976 | /* Write the data. */ |
| 977 | oldfs = get_fs(); set_fs(KERNEL_DS); |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 978 | host_err = vfs_writev(file, (struct iovec __user *)vec, vlen, &offset); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 979 | set_fs(oldfs); |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 980 | if (host_err >= 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 981 | nfsdstats.io_write += cnt; |
Josef "Jeff" Sipek | 7eaa36e | 2006-12-08 02:36:41 -0800 | [diff] [blame] | 982 | fsnotify_modify(file->f_path.dentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 983 | } |
| 984 | |
| 985 | /* clear setuid/setgid flag after write */ |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 986 | if (host_err >= 0 && (inode->i_mode & (S_ISUID | S_ISGID))) |
Neil Brown | 9f708e4 | 2006-01-06 00:19:59 -0800 | [diff] [blame] | 987 | kill_suid(dentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 988 | |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 989 | if (host_err >= 0 && stable) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 990 | static ino_t last_ino; |
| 991 | static dev_t last_dev; |
| 992 | |
| 993 | /* |
| 994 | * Gathered writes: If another process is currently |
| 995 | * writing to the file, there's a high chance |
| 996 | * this is another nfsd (triggered by a bulk write |
| 997 | * from a client's biod). Rather than syncing the |
| 998 | * file with each write request, we sleep for 10 msec. |
| 999 | * |
| 1000 | * I don't know if this roughly approximates |
| 1001 | * C. Juszak's idea of gathered writes, but it's a |
| 1002 | * nice and simple solution (IMHO), and it seems to |
| 1003 | * work:-) |
| 1004 | */ |
| 1005 | if (EX_WGATHER(exp)) { |
| 1006 | if (atomic_read(&inode->i_writecount) > 1 |
| 1007 | || (last_ino == inode->i_ino && last_dev == inode->i_sb->s_dev)) { |
Pavel Emelyanov | ba25f9d | 2007-10-18 23:40:40 -0700 | [diff] [blame] | 1008 | dprintk("nfsd: write defer %d\n", task_pid_nr(current)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1009 | msleep(10); |
Pavel Emelyanov | ba25f9d | 2007-10-18 23:40:40 -0700 | [diff] [blame] | 1010 | dprintk("nfsd: write resume %d\n", task_pid_nr(current)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1011 | } |
| 1012 | |
| 1013 | if (inode->i_state & I_DIRTY) { |
Pavel Emelyanov | ba25f9d | 2007-10-18 23:40:40 -0700 | [diff] [blame] | 1014 | dprintk("nfsd: write sync %d\n", task_pid_nr(current)); |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1015 | host_err=nfsd_sync(file); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1016 | } |
| 1017 | #if 0 |
| 1018 | wake_up(&inode->i_wait); |
| 1019 | #endif |
| 1020 | } |
| 1021 | last_ino = inode->i_ino; |
| 1022 | last_dev = inode->i_sb->s_dev; |
| 1023 | } |
| 1024 | |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1025 | dprintk("nfsd: write complete host_err=%d\n", host_err); |
| 1026 | if (host_err >= 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1027 | err = 0; |
| 1028 | else |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1029 | err = nfserrno(host_err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1030 | out: |
| 1031 | return err; |
| 1032 | } |
| 1033 | |
| 1034 | /* |
| 1035 | * Read data from a file. count must contain the requested read count |
| 1036 | * on entry. On return, *count contains the number of bytes actually read. |
| 1037 | * N.B. After this call fhp needs an fh_put |
| 1038 | */ |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1039 | __be32 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1040 | nfsd_read(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file, |
| 1041 | loff_t offset, struct kvec *vec, int vlen, |
| 1042 | unsigned long *count) |
| 1043 | { |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1044 | __be32 err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1045 | |
| 1046 | if (file) { |
J. Bruce Fields | 0ec757d | 2007-07-17 04:04:48 -0700 | [diff] [blame] | 1047 | err = nfsd_permission(rqstp, fhp->fh_export, fhp->fh_dentry, |
Miklos Szeredi | 8837abc | 2008-06-16 13:20:29 +0200 | [diff] [blame] | 1048 | NFSD_MAY_READ|NFSD_MAY_OWNER_OVERRIDE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1049 | if (err) |
| 1050 | goto out; |
| 1051 | err = nfsd_vfs_read(rqstp, fhp, file, offset, vec, vlen, count); |
| 1052 | } else { |
Miklos Szeredi | 8837abc | 2008-06-16 13:20:29 +0200 | [diff] [blame] | 1053 | err = nfsd_open(rqstp, fhp, S_IFREG, NFSD_MAY_READ, &file); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1054 | if (err) |
| 1055 | goto out; |
| 1056 | err = nfsd_vfs_read(rqstp, fhp, file, offset, vec, vlen, count); |
| 1057 | nfsd_close(file); |
| 1058 | } |
| 1059 | out: |
| 1060 | return err; |
| 1061 | } |
| 1062 | |
| 1063 | /* |
| 1064 | * Write data to a file. |
| 1065 | * The stable flag requests synchronous writes. |
| 1066 | * N.B. After this call fhp needs an fh_put |
| 1067 | */ |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1068 | __be32 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1069 | nfsd_write(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file, |
| 1070 | loff_t offset, struct kvec *vec, int vlen, unsigned long cnt, |
| 1071 | int *stablep) |
| 1072 | { |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1073 | __be32 err = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1074 | |
| 1075 | if (file) { |
J. Bruce Fields | 0ec757d | 2007-07-17 04:04:48 -0700 | [diff] [blame] | 1076 | err = nfsd_permission(rqstp, fhp->fh_export, fhp->fh_dentry, |
Miklos Szeredi | 8837abc | 2008-06-16 13:20:29 +0200 | [diff] [blame] | 1077 | NFSD_MAY_WRITE|NFSD_MAY_OWNER_OVERRIDE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1078 | if (err) |
| 1079 | goto out; |
| 1080 | err = nfsd_vfs_write(rqstp, fhp, file, offset, vec, vlen, cnt, |
| 1081 | stablep); |
| 1082 | } else { |
Miklos Szeredi | 8837abc | 2008-06-16 13:20:29 +0200 | [diff] [blame] | 1083 | err = nfsd_open(rqstp, fhp, S_IFREG, NFSD_MAY_WRITE, &file); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1084 | if (err) |
| 1085 | goto out; |
| 1086 | |
| 1087 | if (cnt) |
| 1088 | err = nfsd_vfs_write(rqstp, fhp, file, offset, vec, vlen, |
| 1089 | cnt, stablep); |
| 1090 | nfsd_close(file); |
| 1091 | } |
| 1092 | out: |
| 1093 | return err; |
| 1094 | } |
| 1095 | |
| 1096 | #ifdef CONFIG_NFSD_V3 |
| 1097 | /* |
| 1098 | * Commit all pending writes to stable storage. |
| 1099 | * Strictly speaking, we could sync just the indicated file region here, |
| 1100 | * but there's currently no way we can ask the VFS to do so. |
| 1101 | * |
| 1102 | * Unfortunately we cannot lock the file to make sure we return full WCC |
| 1103 | * data to the client, as locking happens lower down in the filesystem. |
| 1104 | */ |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1105 | __be32 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1106 | nfsd_commit(struct svc_rqst *rqstp, struct svc_fh *fhp, |
| 1107 | loff_t offset, unsigned long count) |
| 1108 | { |
| 1109 | struct file *file; |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1110 | __be32 err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1111 | |
| 1112 | if ((u64)count > ~(u64)offset) |
| 1113 | return nfserr_inval; |
| 1114 | |
Miklos Szeredi | 8837abc | 2008-06-16 13:20:29 +0200 | [diff] [blame] | 1115 | err = nfsd_open(rqstp, fhp, S_IFREG, NFSD_MAY_WRITE, &file); |
| 1116 | if (err) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1117 | return err; |
| 1118 | if (EX_ISSYNC(fhp->fh_export)) { |
| 1119 | if (file->f_op && file->f_op->fsync) { |
NeilBrown | 45bd3b3 | 2006-01-18 17:43:50 -0800 | [diff] [blame] | 1120 | err = nfserrno(nfsd_sync(file)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1121 | } else { |
| 1122 | err = nfserr_notsupp; |
| 1123 | } |
| 1124 | } |
| 1125 | |
| 1126 | nfsd_close(file); |
| 1127 | return err; |
| 1128 | } |
| 1129 | #endif /* CONFIG_NFSD_V3 */ |
| 1130 | |
Adrian Bunk | f2b0dee | 2008-02-13 23:30:26 +0200 | [diff] [blame] | 1131 | static __be32 |
J. Bruce Fields | 5c002b3 | 2007-11-30 16:55:23 -0500 | [diff] [blame] | 1132 | nfsd_create_setattr(struct svc_rqst *rqstp, struct svc_fh *resfhp, |
| 1133 | struct iattr *iap) |
| 1134 | { |
| 1135 | /* |
| 1136 | * Mode has already been set earlier in create: |
| 1137 | */ |
| 1138 | iap->ia_valid &= ~ATTR_MODE; |
| 1139 | /* |
| 1140 | * Setting uid/gid works only for root. Irix appears to |
| 1141 | * send along the gid on create when it tries to implement |
| 1142 | * setgid directories via NFS: |
| 1143 | */ |
David Howells | 5cc0a84 | 2008-11-14 10:38:58 +1100 | [diff] [blame] | 1144 | if (current_fsuid() != 0) |
J. Bruce Fields | 5c002b3 | 2007-11-30 16:55:23 -0500 | [diff] [blame] | 1145 | iap->ia_valid &= ~(ATTR_UID|ATTR_GID); |
| 1146 | if (iap->ia_valid) |
| 1147 | return nfsd_setattr(rqstp, resfhp, iap, 0, (time_t)0); |
| 1148 | return 0; |
| 1149 | } |
| 1150 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1151 | /* |
| 1152 | * Create a file (regular, directory, device, fifo); UNIX sockets |
| 1153 | * not yet implemented. |
| 1154 | * If the response fh has been verified, the parent directory should |
| 1155 | * already be locked. Note that the parent directory is left locked. |
| 1156 | * |
| 1157 | * N.B. Every call to nfsd_create needs an fh_put for _both_ fhp and resfhp |
| 1158 | */ |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1159 | __be32 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1160 | nfsd_create(struct svc_rqst *rqstp, struct svc_fh *fhp, |
| 1161 | char *fname, int flen, struct iattr *iap, |
| 1162 | int type, dev_t rdev, struct svc_fh *resfhp) |
| 1163 | { |
| 1164 | struct dentry *dentry, *dchild = NULL; |
| 1165 | struct inode *dirp; |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1166 | __be32 err; |
J. Bruce Fields | 5c002b3 | 2007-11-30 16:55:23 -0500 | [diff] [blame] | 1167 | __be32 err2; |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1168 | int host_err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1169 | |
| 1170 | err = nfserr_perm; |
| 1171 | if (!flen) |
| 1172 | goto out; |
| 1173 | err = nfserr_exist; |
| 1174 | if (isdotent(fname, flen)) |
| 1175 | goto out; |
| 1176 | |
Miklos Szeredi | 8837abc | 2008-06-16 13:20:29 +0200 | [diff] [blame] | 1177 | err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_CREATE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1178 | if (err) |
| 1179 | goto out; |
| 1180 | |
| 1181 | dentry = fhp->fh_dentry; |
| 1182 | dirp = dentry->d_inode; |
| 1183 | |
| 1184 | err = nfserr_notdir; |
Al Viro | acfa438 | 2008-12-04 10:06:33 -0500 | [diff] [blame] | 1185 | if (!dirp->i_op->lookup) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1186 | goto out; |
| 1187 | /* |
| 1188 | * Check whether the response file handle has been verified yet. |
| 1189 | * If it has, the parent directory should already be locked. |
| 1190 | */ |
| 1191 | if (!resfhp->fh_dentry) { |
| 1192 | /* called from nfsd_proc_mkdir, or possibly nfsd3_proc_create */ |
Peter Zijlstra | 12fd352 | 2006-10-02 02:18:03 -0700 | [diff] [blame] | 1193 | fh_lock_nested(fhp, I_MUTEX_PARENT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1194 | dchild = lookup_one_len(fname, dentry, flen); |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1195 | host_err = PTR_ERR(dchild); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1196 | if (IS_ERR(dchild)) |
| 1197 | goto out_nfserr; |
| 1198 | err = fh_compose(resfhp, fhp->fh_export, dchild, fhp); |
| 1199 | if (err) |
| 1200 | goto out; |
| 1201 | } else { |
| 1202 | /* called from nfsd_proc_create */ |
| 1203 | dchild = dget(resfhp->fh_dentry); |
| 1204 | if (!fhp->fh_locked) { |
| 1205 | /* not actually possible */ |
| 1206 | printk(KERN_ERR |
| 1207 | "nfsd_create: parent %s/%s not locked!\n", |
| 1208 | dentry->d_parent->d_name.name, |
| 1209 | dentry->d_name.name); |
Al Viro | d75f2b9 | 2006-01-18 17:43:44 -0800 | [diff] [blame] | 1210 | err = nfserr_io; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1211 | goto out; |
| 1212 | } |
| 1213 | } |
| 1214 | /* |
| 1215 | * Make sure the child dentry is still negative ... |
| 1216 | */ |
| 1217 | err = nfserr_exist; |
| 1218 | if (dchild->d_inode) { |
| 1219 | dprintk("nfsd_create: dentry %s/%s not negative!\n", |
| 1220 | dentry->d_name.name, dchild->d_name.name); |
| 1221 | goto out; |
| 1222 | } |
| 1223 | |
| 1224 | if (!(iap->ia_valid & ATTR_MODE)) |
| 1225 | iap->ia_mode = 0; |
| 1226 | iap->ia_mode = (iap->ia_mode & S_IALLUGO) | type; |
| 1227 | |
Miklos Szeredi | 07cad1d | 2008-07-01 15:38:35 +0200 | [diff] [blame] | 1228 | err = nfserr_inval; |
| 1229 | if (!S_ISREG(type) && !S_ISDIR(type) && !special_file(type)) { |
| 1230 | printk(KERN_WARNING "nfsd: bad file type %o in nfsd_create\n", |
| 1231 | type); |
| 1232 | goto out; |
| 1233 | } |
| 1234 | |
| 1235 | host_err = mnt_want_write(fhp->fh_export->ex_path.mnt); |
| 1236 | if (host_err) |
| 1237 | goto out_nfserr; |
| 1238 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1239 | /* |
| 1240 | * Get the dir op function pointer. |
| 1241 | */ |
J. Bruce Fields | 088406b | 2006-11-08 17:44:59 -0800 | [diff] [blame] | 1242 | err = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1243 | switch (type) { |
| 1244 | case S_IFREG: |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1245 | host_err = vfs_create(dirp, dchild, iap->ia_mode, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1246 | break; |
| 1247 | case S_IFDIR: |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1248 | host_err = vfs_mkdir(dirp, dchild, iap->ia_mode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1249 | break; |
| 1250 | case S_IFCHR: |
| 1251 | case S_IFBLK: |
| 1252 | case S_IFIFO: |
| 1253 | case S_IFSOCK: |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1254 | host_err = vfs_mknod(dirp, dchild, iap->ia_mode, rdev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1255 | break; |
Dave Hansen | 463c319 | 2008-02-15 14:37:57 -0800 | [diff] [blame] | 1256 | } |
| 1257 | if (host_err < 0) { |
| 1258 | mnt_drop_write(fhp->fh_export->ex_path.mnt); |
| 1259 | goto out_nfserr; |
| 1260 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1261 | |
| 1262 | if (EX_ISSYNC(fhp->fh_export)) { |
NeilBrown | 45bd3b3 | 2006-01-18 17:43:50 -0800 | [diff] [blame] | 1263 | err = nfserrno(nfsd_sync_dir(dentry)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1264 | write_inode_now(dchild->d_inode, 1); |
| 1265 | } |
| 1266 | |
J. Bruce Fields | 5c002b3 | 2007-11-30 16:55:23 -0500 | [diff] [blame] | 1267 | err2 = nfsd_create_setattr(rqstp, resfhp, iap); |
| 1268 | if (err2) |
| 1269 | err = err2; |
Dave Hansen | 463c319 | 2008-02-15 14:37:57 -0800 | [diff] [blame] | 1270 | mnt_drop_write(fhp->fh_export->ex_path.mnt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1271 | /* |
| 1272 | * Update the file handle to get the new inode info. |
| 1273 | */ |
| 1274 | if (!err) |
| 1275 | err = fh_update(resfhp); |
| 1276 | out: |
| 1277 | if (dchild && !IS_ERR(dchild)) |
| 1278 | dput(dchild); |
| 1279 | return err; |
| 1280 | |
| 1281 | out_nfserr: |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1282 | err = nfserrno(host_err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1283 | goto out; |
| 1284 | } |
| 1285 | |
| 1286 | #ifdef CONFIG_NFSD_V3 |
| 1287 | /* |
| 1288 | * NFSv3 version of nfsd_create |
| 1289 | */ |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1290 | __be32 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1291 | nfsd_create_v3(struct svc_rqst *rqstp, struct svc_fh *fhp, |
| 1292 | char *fname, int flen, struct iattr *iap, |
| 1293 | struct svc_fh *resfhp, int createmode, u32 *verifier, |
J. Bruce Fields | 81ac95c | 2006-11-08 17:44:40 -0800 | [diff] [blame] | 1294 | int *truncp, int *created) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1295 | { |
| 1296 | struct dentry *dentry, *dchild = NULL; |
| 1297 | struct inode *dirp; |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1298 | __be32 err; |
J. Bruce Fields | 5c002b3 | 2007-11-30 16:55:23 -0500 | [diff] [blame] | 1299 | __be32 err2; |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1300 | int host_err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1301 | __u32 v_mtime=0, v_atime=0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1302 | |
| 1303 | err = nfserr_perm; |
| 1304 | if (!flen) |
| 1305 | goto out; |
| 1306 | err = nfserr_exist; |
| 1307 | if (isdotent(fname, flen)) |
| 1308 | goto out; |
| 1309 | if (!(iap->ia_valid & ATTR_MODE)) |
| 1310 | iap->ia_mode = 0; |
Miklos Szeredi | 8837abc | 2008-06-16 13:20:29 +0200 | [diff] [blame] | 1311 | err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_CREATE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1312 | if (err) |
| 1313 | goto out; |
| 1314 | |
| 1315 | dentry = fhp->fh_dentry; |
| 1316 | dirp = dentry->d_inode; |
| 1317 | |
| 1318 | /* Get all the sanity checks out of the way before |
| 1319 | * we lock the parent. */ |
| 1320 | err = nfserr_notdir; |
Al Viro | acfa438 | 2008-12-04 10:06:33 -0500 | [diff] [blame] | 1321 | if (!dirp->i_op->lookup) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1322 | goto out; |
Peter Zijlstra | 12fd352 | 2006-10-02 02:18:03 -0700 | [diff] [blame] | 1323 | fh_lock_nested(fhp, I_MUTEX_PARENT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1324 | |
| 1325 | /* |
| 1326 | * Compose the response file handle. |
| 1327 | */ |
| 1328 | dchild = lookup_one_len(fname, dentry, flen); |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1329 | host_err = PTR_ERR(dchild); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1330 | if (IS_ERR(dchild)) |
| 1331 | goto out_nfserr; |
| 1332 | |
| 1333 | err = fh_compose(resfhp, fhp->fh_export, dchild, fhp); |
| 1334 | if (err) |
| 1335 | goto out; |
| 1336 | |
| 1337 | if (createmode == NFS3_CREATE_EXCLUSIVE) { |
Peter Staubach | c397852 | 2007-01-26 00:57:00 -0800 | [diff] [blame] | 1338 | /* solaris7 gets confused (bugid 4218508) if these have |
Jeff Layton | 749997e | 2007-07-31 00:37:51 -0700 | [diff] [blame] | 1339 | * the high bit set, so just clear the high bits. If this is |
| 1340 | * ever changed to use different attrs for storing the |
| 1341 | * verifier, then do_open_lookup() will also need to be fixed |
| 1342 | * accordingly. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1343 | */ |
| 1344 | v_mtime = verifier[0]&0x7fffffff; |
| 1345 | v_atime = verifier[1]&0x7fffffff; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1346 | } |
| 1347 | |
Dave Hansen | 463c319 | 2008-02-15 14:37:57 -0800 | [diff] [blame] | 1348 | host_err = mnt_want_write(fhp->fh_export->ex_path.mnt); |
| 1349 | if (host_err) |
| 1350 | goto out_nfserr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1351 | if (dchild->d_inode) { |
| 1352 | err = 0; |
| 1353 | |
| 1354 | switch (createmode) { |
| 1355 | case NFS3_CREATE_UNCHECKED: |
| 1356 | if (! S_ISREG(dchild->d_inode->i_mode)) |
| 1357 | err = nfserr_exist; |
| 1358 | else if (truncp) { |
| 1359 | /* in nfsv4, we need to treat this case a little |
| 1360 | * differently. we don't want to truncate the |
| 1361 | * file now; this would be wrong if the OPEN |
| 1362 | * fails for some other reason. furthermore, |
| 1363 | * if the size is nonzero, we should ignore it |
| 1364 | * according to spec! |
| 1365 | */ |
| 1366 | *truncp = (iap->ia_valid & ATTR_SIZE) && !iap->ia_size; |
| 1367 | } |
| 1368 | else { |
| 1369 | iap->ia_valid &= ATTR_SIZE; |
| 1370 | goto set_attr; |
| 1371 | } |
| 1372 | break; |
| 1373 | case NFS3_CREATE_EXCLUSIVE: |
| 1374 | if ( dchild->d_inode->i_mtime.tv_sec == v_mtime |
| 1375 | && dchild->d_inode->i_atime.tv_sec == v_atime |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1376 | && dchild->d_inode->i_size == 0 ) |
| 1377 | break; |
| 1378 | /* fallthru */ |
| 1379 | case NFS3_CREATE_GUARDED: |
| 1380 | err = nfserr_exist; |
| 1381 | } |
Dave Hansen | 463c319 | 2008-02-15 14:37:57 -0800 | [diff] [blame] | 1382 | mnt_drop_write(fhp->fh_export->ex_path.mnt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1383 | goto out; |
| 1384 | } |
| 1385 | |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1386 | host_err = vfs_create(dirp, dchild, iap->ia_mode, NULL); |
Dave Hansen | 463c319 | 2008-02-15 14:37:57 -0800 | [diff] [blame] | 1387 | if (host_err < 0) { |
| 1388 | mnt_drop_write(fhp->fh_export->ex_path.mnt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1389 | goto out_nfserr; |
Dave Hansen | 463c319 | 2008-02-15 14:37:57 -0800 | [diff] [blame] | 1390 | } |
J. Bruce Fields | 81ac95c | 2006-11-08 17:44:40 -0800 | [diff] [blame] | 1391 | if (created) |
| 1392 | *created = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1393 | |
| 1394 | if (EX_ISSYNC(fhp->fh_export)) { |
NeilBrown | 45bd3b3 | 2006-01-18 17:43:50 -0800 | [diff] [blame] | 1395 | err = nfserrno(nfsd_sync_dir(dentry)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1396 | /* setattr will sync the child (or not) */ |
| 1397 | } |
| 1398 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1399 | if (createmode == NFS3_CREATE_EXCLUSIVE) { |
Peter Staubach | c397852 | 2007-01-26 00:57:00 -0800 | [diff] [blame] | 1400 | /* Cram the verifier into atime/mtime */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1401 | iap->ia_valid = ATTR_MTIME|ATTR_ATIME |
Peter Staubach | c397852 | 2007-01-26 00:57:00 -0800 | [diff] [blame] | 1402 | | ATTR_MTIME_SET|ATTR_ATIME_SET; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1403 | /* XXX someone who knows this better please fix it for nsec */ |
| 1404 | iap->ia_mtime.tv_sec = v_mtime; |
| 1405 | iap->ia_atime.tv_sec = v_atime; |
| 1406 | iap->ia_mtime.tv_nsec = 0; |
| 1407 | iap->ia_atime.tv_nsec = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1408 | } |
| 1409 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1410 | set_attr: |
J. Bruce Fields | 5c002b3 | 2007-11-30 16:55:23 -0500 | [diff] [blame] | 1411 | err2 = nfsd_create_setattr(rqstp, resfhp, iap); |
| 1412 | if (err2) |
| 1413 | err = err2; |
YAMAMOTO Takashi | f193fba | 2006-01-18 17:43:13 -0800 | [diff] [blame] | 1414 | |
Dave Hansen | 463c319 | 2008-02-15 14:37:57 -0800 | [diff] [blame] | 1415 | mnt_drop_write(fhp->fh_export->ex_path.mnt); |
YAMAMOTO Takashi | f193fba | 2006-01-18 17:43:13 -0800 | [diff] [blame] | 1416 | /* |
| 1417 | * Update the filehandle to get the new inode info. |
| 1418 | */ |
| 1419 | if (!err) |
| 1420 | err = fh_update(resfhp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1421 | |
| 1422 | out: |
| 1423 | fh_unlock(fhp); |
| 1424 | if (dchild && !IS_ERR(dchild)) |
| 1425 | dput(dchild); |
| 1426 | return err; |
| 1427 | |
| 1428 | out_nfserr: |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1429 | err = nfserrno(host_err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1430 | goto out; |
| 1431 | } |
| 1432 | #endif /* CONFIG_NFSD_V3 */ |
| 1433 | |
| 1434 | /* |
| 1435 | * Read a symlink. On entry, *lenp must contain the maximum path length that |
| 1436 | * fits into the buffer. On return, it contains the true length. |
| 1437 | * N.B. After this call fhp needs an fh_put |
| 1438 | */ |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1439 | __be32 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1440 | nfsd_readlink(struct svc_rqst *rqstp, struct svc_fh *fhp, char *buf, int *lenp) |
| 1441 | { |
| 1442 | struct dentry *dentry; |
| 1443 | struct inode *inode; |
| 1444 | mm_segment_t oldfs; |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1445 | __be32 err; |
| 1446 | int host_err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1447 | |
Miklos Szeredi | 8837abc | 2008-06-16 13:20:29 +0200 | [diff] [blame] | 1448 | err = fh_verify(rqstp, fhp, S_IFLNK, NFSD_MAY_NOP); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1449 | if (err) |
| 1450 | goto out; |
| 1451 | |
| 1452 | dentry = fhp->fh_dentry; |
| 1453 | inode = dentry->d_inode; |
| 1454 | |
| 1455 | err = nfserr_inval; |
Al Viro | acfa438 | 2008-12-04 10:06:33 -0500 | [diff] [blame] | 1456 | if (!inode->i_op->readlink) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1457 | goto out; |
| 1458 | |
Jan Blunck | 5477549 | 2008-02-14 19:38:39 -0800 | [diff] [blame] | 1459 | touch_atime(fhp->fh_export->ex_path.mnt, dentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1460 | /* N.B. Why does this call need a get_fs()?? |
| 1461 | * Remove the set_fs and watch the fireworks:-) --okir |
| 1462 | */ |
| 1463 | |
| 1464 | oldfs = get_fs(); set_fs(KERNEL_DS); |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1465 | host_err = inode->i_op->readlink(dentry, buf, *lenp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1466 | set_fs(oldfs); |
| 1467 | |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1468 | if (host_err < 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1469 | goto out_nfserr; |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1470 | *lenp = host_err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1471 | err = 0; |
| 1472 | out: |
| 1473 | return err; |
| 1474 | |
| 1475 | out_nfserr: |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1476 | err = nfserrno(host_err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1477 | goto out; |
| 1478 | } |
| 1479 | |
| 1480 | /* |
| 1481 | * Create a symlink and look up its inode |
| 1482 | * N.B. After this call _both_ fhp and resfhp need an fh_put |
| 1483 | */ |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1484 | __be32 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1485 | nfsd_symlink(struct svc_rqst *rqstp, struct svc_fh *fhp, |
| 1486 | char *fname, int flen, |
| 1487 | char *path, int plen, |
| 1488 | struct svc_fh *resfhp, |
| 1489 | struct iattr *iap) |
| 1490 | { |
| 1491 | struct dentry *dentry, *dnew; |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1492 | __be32 err, cerr; |
| 1493 | int host_err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1494 | |
| 1495 | err = nfserr_noent; |
| 1496 | if (!flen || !plen) |
| 1497 | goto out; |
| 1498 | err = nfserr_exist; |
| 1499 | if (isdotent(fname, flen)) |
| 1500 | goto out; |
| 1501 | |
Miklos Szeredi | 8837abc | 2008-06-16 13:20:29 +0200 | [diff] [blame] | 1502 | err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_CREATE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1503 | if (err) |
| 1504 | goto out; |
| 1505 | fh_lock(fhp); |
| 1506 | dentry = fhp->fh_dentry; |
| 1507 | dnew = lookup_one_len(fname, dentry, flen); |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1508 | host_err = PTR_ERR(dnew); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1509 | if (IS_ERR(dnew)) |
| 1510 | goto out_nfserr; |
| 1511 | |
Dave Hansen | 75c3f29 | 2008-02-15 14:37:45 -0800 | [diff] [blame] | 1512 | host_err = mnt_want_write(fhp->fh_export->ex_path.mnt); |
| 1513 | if (host_err) |
| 1514 | goto out_nfserr; |
| 1515 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1516 | if (unlikely(path[plen] != 0)) { |
| 1517 | char *path_alloced = kmalloc(plen+1, GFP_KERNEL); |
| 1518 | if (path_alloced == NULL) |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1519 | host_err = -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1520 | else { |
| 1521 | strncpy(path_alloced, path, plen); |
| 1522 | path_alloced[plen] = 0; |
Miklos Szeredi | db2e747 | 2008-06-24 16:50:16 +0200 | [diff] [blame] | 1523 | host_err = vfs_symlink(dentry->d_inode, dnew, path_alloced); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1524 | kfree(path_alloced); |
| 1525 | } |
| 1526 | } else |
Miklos Szeredi | db2e747 | 2008-06-24 16:50:16 +0200 | [diff] [blame] | 1527 | host_err = vfs_symlink(dentry->d_inode, dnew, path); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1528 | |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1529 | if (!host_err) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1530 | if (EX_ISSYNC(fhp->fh_export)) |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1531 | host_err = nfsd_sync_dir(dentry); |
| 1532 | } |
| 1533 | err = nfserrno(host_err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1534 | fh_unlock(fhp); |
| 1535 | |
Dave Hansen | 75c3f29 | 2008-02-15 14:37:45 -0800 | [diff] [blame] | 1536 | mnt_drop_write(fhp->fh_export->ex_path.mnt); |
| 1537 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1538 | cerr = fh_compose(resfhp, fhp->fh_export, dnew, fhp); |
| 1539 | dput(dnew); |
| 1540 | if (err==0) err = cerr; |
| 1541 | out: |
| 1542 | return err; |
| 1543 | |
| 1544 | out_nfserr: |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1545 | err = nfserrno(host_err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1546 | goto out; |
| 1547 | } |
| 1548 | |
| 1549 | /* |
| 1550 | * Create a hardlink |
| 1551 | * N.B. After this call _both_ ffhp and tfhp need an fh_put |
| 1552 | */ |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1553 | __be32 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1554 | nfsd_link(struct svc_rqst *rqstp, struct svc_fh *ffhp, |
| 1555 | char *name, int len, struct svc_fh *tfhp) |
| 1556 | { |
| 1557 | struct dentry *ddir, *dnew, *dold; |
| 1558 | struct inode *dirp, *dest; |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1559 | __be32 err; |
| 1560 | int host_err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1561 | |
Miklos Szeredi | 8837abc | 2008-06-16 13:20:29 +0200 | [diff] [blame] | 1562 | err = fh_verify(rqstp, ffhp, S_IFDIR, NFSD_MAY_CREATE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1563 | if (err) |
| 1564 | goto out; |
Miklos Szeredi | 8837abc | 2008-06-16 13:20:29 +0200 | [diff] [blame] | 1565 | err = fh_verify(rqstp, tfhp, -S_IFDIR, NFSD_MAY_NOP); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1566 | if (err) |
| 1567 | goto out; |
| 1568 | |
| 1569 | err = nfserr_perm; |
| 1570 | if (!len) |
| 1571 | goto out; |
| 1572 | err = nfserr_exist; |
| 1573 | if (isdotent(name, len)) |
| 1574 | goto out; |
| 1575 | |
Peter Zijlstra | 12fd352 | 2006-10-02 02:18:03 -0700 | [diff] [blame] | 1576 | fh_lock_nested(ffhp, I_MUTEX_PARENT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1577 | ddir = ffhp->fh_dentry; |
| 1578 | dirp = ddir->d_inode; |
| 1579 | |
| 1580 | dnew = lookup_one_len(name, ddir, len); |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1581 | host_err = PTR_ERR(dnew); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1582 | if (IS_ERR(dnew)) |
| 1583 | goto out_nfserr; |
| 1584 | |
| 1585 | dold = tfhp->fh_dentry; |
| 1586 | dest = dold->d_inode; |
| 1587 | |
Dave Hansen | 75c3f29 | 2008-02-15 14:37:45 -0800 | [diff] [blame] | 1588 | host_err = mnt_want_write(tfhp->fh_export->ex_path.mnt); |
| 1589 | if (host_err) { |
| 1590 | err = nfserrno(host_err); |
| 1591 | goto out_dput; |
| 1592 | } |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1593 | host_err = vfs_link(dold, dirp, dnew); |
| 1594 | if (!host_err) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1595 | if (EX_ISSYNC(ffhp->fh_export)) { |
NeilBrown | 45bd3b3 | 2006-01-18 17:43:50 -0800 | [diff] [blame] | 1596 | err = nfserrno(nfsd_sync_dir(ddir)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1597 | write_inode_now(dest, 1); |
| 1598 | } |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1599 | err = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1600 | } else { |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1601 | if (host_err == -EXDEV && rqstp->rq_vers == 2) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1602 | err = nfserr_acces; |
| 1603 | else |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1604 | err = nfserrno(host_err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1605 | } |
Dave Hansen | 75c3f29 | 2008-02-15 14:37:45 -0800 | [diff] [blame] | 1606 | mnt_drop_write(tfhp->fh_export->ex_path.mnt); |
| 1607 | out_dput: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1608 | dput(dnew); |
David M. Richter | 270d56e | 2006-06-30 01:56:15 -0700 | [diff] [blame] | 1609 | out_unlock: |
| 1610 | fh_unlock(ffhp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1611 | out: |
| 1612 | return err; |
| 1613 | |
| 1614 | out_nfserr: |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1615 | err = nfserrno(host_err); |
David M. Richter | 270d56e | 2006-06-30 01:56:15 -0700 | [diff] [blame] | 1616 | goto out_unlock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1617 | } |
| 1618 | |
| 1619 | /* |
| 1620 | * Rename a file |
| 1621 | * N.B. After this call _both_ ffhp and tfhp need an fh_put |
| 1622 | */ |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1623 | __be32 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1624 | nfsd_rename(struct svc_rqst *rqstp, struct svc_fh *ffhp, char *fname, int flen, |
| 1625 | struct svc_fh *tfhp, char *tname, int tlen) |
| 1626 | { |
| 1627 | struct dentry *fdentry, *tdentry, *odentry, *ndentry, *trap; |
| 1628 | struct inode *fdir, *tdir; |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1629 | __be32 err; |
| 1630 | int host_err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1631 | |
Miklos Szeredi | 8837abc | 2008-06-16 13:20:29 +0200 | [diff] [blame] | 1632 | err = fh_verify(rqstp, ffhp, S_IFDIR, NFSD_MAY_REMOVE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1633 | if (err) |
| 1634 | goto out; |
Miklos Szeredi | 8837abc | 2008-06-16 13:20:29 +0200 | [diff] [blame] | 1635 | err = fh_verify(rqstp, tfhp, S_IFDIR, NFSD_MAY_CREATE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1636 | if (err) |
| 1637 | goto out; |
| 1638 | |
| 1639 | fdentry = ffhp->fh_dentry; |
| 1640 | fdir = fdentry->d_inode; |
| 1641 | |
| 1642 | tdentry = tfhp->fh_dentry; |
| 1643 | tdir = tdentry->d_inode; |
| 1644 | |
| 1645 | err = (rqstp->rq_vers == 2) ? nfserr_acces : nfserr_xdev; |
NeilBrown | a56f393 | 2006-06-30 01:56:10 -0700 | [diff] [blame] | 1646 | if (ffhp->fh_export != tfhp->fh_export) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1647 | goto out; |
| 1648 | |
| 1649 | err = nfserr_perm; |
| 1650 | if (!flen || isdotent(fname, flen) || !tlen || isdotent(tname, tlen)) |
| 1651 | goto out; |
| 1652 | |
| 1653 | /* cannot use fh_lock as we need deadlock protective ordering |
| 1654 | * so do it by hand */ |
| 1655 | trap = lock_rename(tdentry, fdentry); |
| 1656 | ffhp->fh_locked = tfhp->fh_locked = 1; |
| 1657 | fill_pre_wcc(ffhp); |
| 1658 | fill_pre_wcc(tfhp); |
| 1659 | |
| 1660 | odentry = lookup_one_len(fname, fdentry, flen); |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1661 | host_err = PTR_ERR(odentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1662 | if (IS_ERR(odentry)) |
| 1663 | goto out_nfserr; |
| 1664 | |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1665 | host_err = -ENOENT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1666 | if (!odentry->d_inode) |
| 1667 | goto out_dput_old; |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1668 | host_err = -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1669 | if (odentry == trap) |
| 1670 | goto out_dput_old; |
| 1671 | |
| 1672 | ndentry = lookup_one_len(tname, tdentry, tlen); |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1673 | host_err = PTR_ERR(ndentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1674 | if (IS_ERR(ndentry)) |
| 1675 | goto out_dput_old; |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1676 | host_err = -ENOTEMPTY; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1677 | if (ndentry == trap) |
| 1678 | goto out_dput_new; |
| 1679 | |
Dave Hansen | 9079b1e | 2008-02-15 14:37:49 -0800 | [diff] [blame] | 1680 | if (svc_msnfs(ffhp) && |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1681 | ((atomic_read(&odentry->d_count) > 1) |
| 1682 | || (atomic_read(&ndentry->d_count) > 1))) { |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1683 | host_err = -EPERM; |
Dave Hansen | 9079b1e | 2008-02-15 14:37:49 -0800 | [diff] [blame] | 1684 | goto out_dput_new; |
| 1685 | } |
| 1686 | |
| 1687 | host_err = -EXDEV; |
| 1688 | if (ffhp->fh_export->ex_path.mnt != tfhp->fh_export->ex_path.mnt) |
| 1689 | goto out_dput_new; |
| 1690 | host_err = mnt_want_write(ffhp->fh_export->ex_path.mnt); |
| 1691 | if (host_err) |
| 1692 | goto out_dput_new; |
| 1693 | |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1694 | host_err = vfs_rename(fdir, odentry, tdir, ndentry); |
| 1695 | if (!host_err && EX_ISSYNC(tfhp->fh_export)) { |
| 1696 | host_err = nfsd_sync_dir(tdentry); |
| 1697 | if (!host_err) |
| 1698 | host_err = nfsd_sync_dir(fdentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1699 | } |
| 1700 | |
Dave Hansen | 9079b1e | 2008-02-15 14:37:49 -0800 | [diff] [blame] | 1701 | mnt_drop_write(ffhp->fh_export->ex_path.mnt); |
| 1702 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1703 | out_dput_new: |
| 1704 | dput(ndentry); |
| 1705 | out_dput_old: |
| 1706 | dput(odentry); |
| 1707 | out_nfserr: |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1708 | err = nfserrno(host_err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1709 | |
| 1710 | /* we cannot reply on fh_unlock on the two filehandles, |
| 1711 | * as that would do the wrong thing if the two directories |
| 1712 | * were the same, so again we do it by hand |
| 1713 | */ |
| 1714 | fill_post_wcc(ffhp); |
| 1715 | fill_post_wcc(tfhp); |
| 1716 | unlock_rename(tdentry, fdentry); |
| 1717 | ffhp->fh_locked = tfhp->fh_locked = 0; |
| 1718 | |
| 1719 | out: |
| 1720 | return err; |
| 1721 | } |
| 1722 | |
| 1723 | /* |
| 1724 | * Unlink a file or directory |
| 1725 | * N.B. After this call fhp needs an fh_put |
| 1726 | */ |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1727 | __be32 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1728 | nfsd_unlink(struct svc_rqst *rqstp, struct svc_fh *fhp, int type, |
| 1729 | char *fname, int flen) |
| 1730 | { |
| 1731 | struct dentry *dentry, *rdentry; |
| 1732 | struct inode *dirp; |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1733 | __be32 err; |
| 1734 | int host_err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1735 | |
| 1736 | err = nfserr_acces; |
| 1737 | if (!flen || isdotent(fname, flen)) |
| 1738 | goto out; |
Miklos Szeredi | 8837abc | 2008-06-16 13:20:29 +0200 | [diff] [blame] | 1739 | err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_REMOVE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1740 | if (err) |
| 1741 | goto out; |
| 1742 | |
Peter Zijlstra | 12fd352 | 2006-10-02 02:18:03 -0700 | [diff] [blame] | 1743 | fh_lock_nested(fhp, I_MUTEX_PARENT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1744 | dentry = fhp->fh_dentry; |
| 1745 | dirp = dentry->d_inode; |
| 1746 | |
| 1747 | rdentry = lookup_one_len(fname, dentry, flen); |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1748 | host_err = PTR_ERR(rdentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1749 | if (IS_ERR(rdentry)) |
| 1750 | goto out_nfserr; |
| 1751 | |
| 1752 | if (!rdentry->d_inode) { |
| 1753 | dput(rdentry); |
| 1754 | err = nfserr_noent; |
| 1755 | goto out; |
| 1756 | } |
| 1757 | |
| 1758 | if (!type) |
| 1759 | type = rdentry->d_inode->i_mode & S_IFMT; |
| 1760 | |
Dave Hansen | 0622753 | 2008-02-15 14:37:34 -0800 | [diff] [blame] | 1761 | host_err = mnt_want_write(fhp->fh_export->ex_path.mnt); |
| 1762 | if (host_err) |
| 1763 | goto out_nfserr; |
| 1764 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1765 | if (type != S_IFDIR) { /* It's UNLINK */ |
| 1766 | #ifdef MSNFS |
| 1767 | if ((fhp->fh_export->ex_flags & NFSEXP_MSNFS) && |
| 1768 | (atomic_read(&rdentry->d_count) > 1)) { |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1769 | host_err = -EPERM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1770 | } else |
| 1771 | #endif |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1772 | host_err = vfs_unlink(dirp, rdentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1773 | } else { /* It's RMDIR */ |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1774 | host_err = vfs_rmdir(dirp, rdentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1775 | } |
| 1776 | |
| 1777 | dput(rdentry); |
| 1778 | |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1779 | if (host_err) |
Dave Hansen | 0622753 | 2008-02-15 14:37:34 -0800 | [diff] [blame] | 1780 | goto out_drop; |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1781 | if (EX_ISSYNC(fhp->fh_export)) |
| 1782 | host_err = nfsd_sync_dir(dentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1783 | |
Dave Hansen | 0622753 | 2008-02-15 14:37:34 -0800 | [diff] [blame] | 1784 | out_drop: |
| 1785 | mnt_drop_write(fhp->fh_export->ex_path.mnt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1786 | out_nfserr: |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1787 | err = nfserrno(host_err); |
YAMAMOTO Takashi | f193fba | 2006-01-18 17:43:13 -0800 | [diff] [blame] | 1788 | out: |
| 1789 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1790 | } |
| 1791 | |
| 1792 | /* |
David Woodhouse | 14f7dd6 | 2008-07-31 20:29:12 +0100 | [diff] [blame] | 1793 | * We do this buffering because we must not call back into the file |
| 1794 | * system's ->lookup() method from the filldir callback. That may well |
| 1795 | * deadlock a number of file systems. |
| 1796 | * |
| 1797 | * This is based heavily on the implementation of same in XFS. |
| 1798 | */ |
| 1799 | struct buffered_dirent { |
| 1800 | u64 ino; |
| 1801 | loff_t offset; |
| 1802 | int namlen; |
| 1803 | unsigned int d_type; |
| 1804 | char name[]; |
| 1805 | }; |
| 1806 | |
| 1807 | struct readdir_data { |
| 1808 | char *dirent; |
| 1809 | size_t used; |
Al Viro | 53c9c5c | 2008-08-24 07:29:52 -0400 | [diff] [blame] | 1810 | int full; |
David Woodhouse | 14f7dd6 | 2008-07-31 20:29:12 +0100 | [diff] [blame] | 1811 | }; |
| 1812 | |
| 1813 | static int nfsd_buffered_filldir(void *__buf, const char *name, int namlen, |
| 1814 | loff_t offset, u64 ino, unsigned int d_type) |
David Woodhouse | 2628b76 | 2008-07-31 17:16:51 +0100 | [diff] [blame] | 1815 | { |
David Woodhouse | 14f7dd6 | 2008-07-31 20:29:12 +0100 | [diff] [blame] | 1816 | struct readdir_data *buf = __buf; |
| 1817 | struct buffered_dirent *de = (void *)(buf->dirent + buf->used); |
| 1818 | unsigned int reclen; |
| 1819 | |
| 1820 | reclen = ALIGN(sizeof(struct buffered_dirent) + namlen, sizeof(u64)); |
Al Viro | 53c9c5c | 2008-08-24 07:29:52 -0400 | [diff] [blame] | 1821 | if (buf->used + reclen > PAGE_SIZE) { |
| 1822 | buf->full = 1; |
David Woodhouse | 14f7dd6 | 2008-07-31 20:29:12 +0100 | [diff] [blame] | 1823 | return -EINVAL; |
Al Viro | 53c9c5c | 2008-08-24 07:29:52 -0400 | [diff] [blame] | 1824 | } |
David Woodhouse | 14f7dd6 | 2008-07-31 20:29:12 +0100 | [diff] [blame] | 1825 | |
| 1826 | de->namlen = namlen; |
| 1827 | de->offset = offset; |
| 1828 | de->ino = ino; |
| 1829 | de->d_type = d_type; |
| 1830 | memcpy(de->name, name, namlen); |
| 1831 | buf->used += reclen; |
| 1832 | |
| 1833 | return 0; |
| 1834 | } |
| 1835 | |
| 1836 | static int nfsd_buffered_readdir(struct file *file, filldir_t func, |
| 1837 | struct readdir_cd *cdp, loff_t *offsetp) |
| 1838 | { |
| 1839 | struct readdir_data buf; |
| 1840 | struct buffered_dirent *de; |
David Woodhouse | 2628b76 | 2008-07-31 17:16:51 +0100 | [diff] [blame] | 1841 | int host_err; |
David Woodhouse | 14f7dd6 | 2008-07-31 20:29:12 +0100 | [diff] [blame] | 1842 | int size; |
| 1843 | loff_t offset; |
David Woodhouse | 2628b76 | 2008-07-31 17:16:51 +0100 | [diff] [blame] | 1844 | |
David Woodhouse | 14f7dd6 | 2008-07-31 20:29:12 +0100 | [diff] [blame] | 1845 | buf.dirent = (void *)__get_free_page(GFP_KERNEL); |
| 1846 | if (!buf.dirent) |
| 1847 | return -ENOMEM; |
David Woodhouse | 2628b76 | 2008-07-31 17:16:51 +0100 | [diff] [blame] | 1848 | |
David Woodhouse | 14f7dd6 | 2008-07-31 20:29:12 +0100 | [diff] [blame] | 1849 | offset = *offsetp; |
David Woodhouse | 14f7dd6 | 2008-07-31 20:29:12 +0100 | [diff] [blame] | 1850 | |
| 1851 | while (1) { |
| 1852 | unsigned int reclen; |
| 1853 | |
Doug Nazar | b726e92 | 2008-11-05 06:16:28 -0500 | [diff] [blame] | 1854 | cdp->err = nfserr_eof; /* will be cleared on successful read */ |
David Woodhouse | 14f7dd6 | 2008-07-31 20:29:12 +0100 | [diff] [blame] | 1855 | buf.used = 0; |
Al Viro | 53c9c5c | 2008-08-24 07:29:52 -0400 | [diff] [blame] | 1856 | buf.full = 0; |
David Woodhouse | 14f7dd6 | 2008-07-31 20:29:12 +0100 | [diff] [blame] | 1857 | |
| 1858 | host_err = vfs_readdir(file, nfsd_buffered_filldir, &buf); |
Al Viro | 53c9c5c | 2008-08-24 07:29:52 -0400 | [diff] [blame] | 1859 | if (buf.full) |
| 1860 | host_err = 0; |
| 1861 | |
| 1862 | if (host_err < 0) |
David Woodhouse | 14f7dd6 | 2008-07-31 20:29:12 +0100 | [diff] [blame] | 1863 | break; |
| 1864 | |
| 1865 | size = buf.used; |
| 1866 | |
| 1867 | if (!size) |
| 1868 | break; |
| 1869 | |
David Woodhouse | 14f7dd6 | 2008-07-31 20:29:12 +0100 | [diff] [blame] | 1870 | de = (struct buffered_dirent *)buf.dirent; |
| 1871 | while (size > 0) { |
| 1872 | offset = de->offset; |
| 1873 | |
| 1874 | if (func(cdp, de->name, de->namlen, de->offset, |
| 1875 | de->ino, de->d_type)) |
| 1876 | goto done; |
| 1877 | |
| 1878 | if (cdp->err != nfs_ok) |
| 1879 | goto done; |
| 1880 | |
| 1881 | reclen = ALIGN(sizeof(*de) + de->namlen, |
| 1882 | sizeof(u64)); |
| 1883 | size -= reclen; |
| 1884 | de = (struct buffered_dirent *)((char *)de + reclen); |
| 1885 | } |
David Woodhouse | c002a6c | 2008-08-17 17:21:18 +0100 | [diff] [blame] | 1886 | offset = vfs_llseek(file, 0, SEEK_CUR); |
David Woodhouse | 14f7dd6 | 2008-07-31 20:29:12 +0100 | [diff] [blame] | 1887 | } |
| 1888 | |
| 1889 | done: |
| 1890 | free_page((unsigned long)(buf.dirent)); |
David Woodhouse | 2628b76 | 2008-07-31 17:16:51 +0100 | [diff] [blame] | 1891 | |
| 1892 | if (host_err) |
| 1893 | return nfserrno(host_err); |
David Woodhouse | 14f7dd6 | 2008-07-31 20:29:12 +0100 | [diff] [blame] | 1894 | |
| 1895 | *offsetp = offset; |
| 1896 | return cdp->err; |
David Woodhouse | 2628b76 | 2008-07-31 17:16:51 +0100 | [diff] [blame] | 1897 | } |
| 1898 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1899 | /* |
| 1900 | * Read entries from a directory. |
| 1901 | * The NFSv3/4 verifier we ignore for now. |
| 1902 | */ |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1903 | __be32 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1904 | nfsd_readdir(struct svc_rqst *rqstp, struct svc_fh *fhp, loff_t *offsetp, |
NeilBrown | a0ad13e | 2007-01-26 00:57:10 -0800 | [diff] [blame] | 1905 | struct readdir_cd *cdp, filldir_t func) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1906 | { |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1907 | __be32 err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1908 | struct file *file; |
| 1909 | loff_t offset = *offsetp; |
| 1910 | |
Miklos Szeredi | 8837abc | 2008-06-16 13:20:29 +0200 | [diff] [blame] | 1911 | err = nfsd_open(rqstp, fhp, S_IFDIR, NFSD_MAY_READ, &file); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1912 | if (err) |
| 1913 | goto out; |
| 1914 | |
| 1915 | offset = vfs_llseek(file, offset, 0); |
| 1916 | if (offset < 0) { |
| 1917 | err = nfserrno((int)offset); |
| 1918 | goto out_close; |
| 1919 | } |
| 1920 | |
David Woodhouse | 14f7dd6 | 2008-07-31 20:29:12 +0100 | [diff] [blame] | 1921 | err = nfsd_buffered_readdir(file, func, cdp, offsetp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1922 | |
| 1923 | if (err == nfserr_eof || err == nfserr_toosmall) |
| 1924 | err = nfs_ok; /* can still be found in ->err */ |
| 1925 | out_close: |
| 1926 | nfsd_close(file); |
| 1927 | out: |
| 1928 | return err; |
| 1929 | } |
| 1930 | |
| 1931 | /* |
| 1932 | * Get file system stats |
| 1933 | * N.B. After this call fhp needs an fh_put |
| 1934 | */ |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1935 | __be32 |
J. Bruce Fields | 04716e6 | 2008-08-07 13:00:20 -0400 | [diff] [blame] | 1936 | nfsd_statfs(struct svc_rqst *rqstp, struct svc_fh *fhp, struct kstatfs *stat, int access) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1937 | { |
J. Bruce Fields | 04716e6 | 2008-08-07 13:00:20 -0400 | [diff] [blame] | 1938 | __be32 err = fh_verify(rqstp, fhp, 0, NFSD_MAY_NOP | access); |
David Howells | 726c334 | 2006-06-23 02:02:58 -0700 | [diff] [blame] | 1939 | if (!err && vfs_statfs(fhp->fh_dentry,stat)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1940 | err = nfserr_io; |
| 1941 | return err; |
| 1942 | } |
| 1943 | |
J. Bruce Fields | c7d5140 | 2007-07-19 01:49:20 -0700 | [diff] [blame] | 1944 | 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] | 1945 | { |
J. Bruce Fields | c7d5140 | 2007-07-19 01:49:20 -0700 | [diff] [blame] | 1946 | return nfsexp_flags(rqstp, exp) & NFSEXP_READONLY; |
J. Bruce Fields | e22841c | 2007-07-19 01:49:20 -0700 | [diff] [blame] | 1947 | } |
| 1948 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1949 | /* |
| 1950 | * Check for a user's access permissions to this inode. |
| 1951 | */ |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1952 | __be32 |
J. Bruce Fields | 0ec757d | 2007-07-17 04:04:48 -0700 | [diff] [blame] | 1953 | nfsd_permission(struct svc_rqst *rqstp, struct svc_export *exp, |
| 1954 | struct dentry *dentry, int acc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1955 | { |
| 1956 | struct inode *inode = dentry->d_inode; |
| 1957 | int err; |
| 1958 | |
Miklos Szeredi | 8837abc | 2008-06-16 13:20:29 +0200 | [diff] [blame] | 1959 | if (acc == NFSD_MAY_NOP) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1960 | return 0; |
| 1961 | #if 0 |
| 1962 | dprintk("nfsd: permission 0x%x%s%s%s%s%s%s%s mode 0%o%s%s%s\n", |
| 1963 | acc, |
Miklos Szeredi | 8837abc | 2008-06-16 13:20:29 +0200 | [diff] [blame] | 1964 | (acc & NFSD_MAY_READ)? " read" : "", |
| 1965 | (acc & NFSD_MAY_WRITE)? " write" : "", |
| 1966 | (acc & NFSD_MAY_EXEC)? " exec" : "", |
| 1967 | (acc & NFSD_MAY_SATTR)? " sattr" : "", |
| 1968 | (acc & NFSD_MAY_TRUNC)? " trunc" : "", |
| 1969 | (acc & NFSD_MAY_LOCK)? " lock" : "", |
| 1970 | (acc & NFSD_MAY_OWNER_OVERRIDE)? " owneroverride" : "", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1971 | inode->i_mode, |
| 1972 | IS_IMMUTABLE(inode)? " immut" : "", |
| 1973 | IS_APPEND(inode)? " append" : "", |
Dave Hansen | 2c463e9 | 2008-02-15 14:37:56 -0800 | [diff] [blame] | 1974 | __mnt_is_readonly(exp->ex_path.mnt)? " ro" : ""); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1975 | dprintk(" owner %d/%d user %d/%d\n", |
David Howells | 5cc0a84 | 2008-11-14 10:38:58 +1100 | [diff] [blame] | 1976 | inode->i_uid, inode->i_gid, current_fsuid(), current_fsgid()); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1977 | #endif |
| 1978 | |
| 1979 | /* Normally we reject any write/sattr etc access on a read-only file |
| 1980 | * system. But if it is IRIX doing check on write-access for a |
| 1981 | * device special file, we ignore rofs. |
| 1982 | */ |
Miklos Szeredi | 8837abc | 2008-06-16 13:20:29 +0200 | [diff] [blame] | 1983 | if (!(acc & NFSD_MAY_LOCAL_ACCESS)) |
| 1984 | if (acc & (NFSD_MAY_WRITE | NFSD_MAY_SATTR | NFSD_MAY_TRUNC)) { |
Dave Hansen | 2c463e9 | 2008-02-15 14:37:56 -0800 | [diff] [blame] | 1985 | if (exp_rdonly(rqstp, exp) || |
| 1986 | __mnt_is_readonly(exp->ex_path.mnt)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1987 | return nfserr_rofs; |
Miklos Szeredi | 8837abc | 2008-06-16 13:20:29 +0200 | [diff] [blame] | 1988 | if (/* (acc & NFSD_MAY_WRITE) && */ IS_IMMUTABLE(inode)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1989 | return nfserr_perm; |
| 1990 | } |
Miklos Szeredi | 8837abc | 2008-06-16 13:20:29 +0200 | [diff] [blame] | 1991 | if ((acc & NFSD_MAY_TRUNC) && IS_APPEND(inode)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1992 | return nfserr_perm; |
| 1993 | |
Miklos Szeredi | 8837abc | 2008-06-16 13:20:29 +0200 | [diff] [blame] | 1994 | if (acc & NFSD_MAY_LOCK) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1995 | /* If we cannot rely on authentication in NLM requests, |
| 1996 | * just allow locks, otherwise require read permission, or |
| 1997 | * ownership |
| 1998 | */ |
| 1999 | if (exp->ex_flags & NFSEXP_NOAUTHNLM) |
| 2000 | return 0; |
| 2001 | else |
Miklos Szeredi | 8837abc | 2008-06-16 13:20:29 +0200 | [diff] [blame] | 2002 | acc = NFSD_MAY_READ | NFSD_MAY_OWNER_OVERRIDE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2003 | } |
| 2004 | /* |
| 2005 | * The file owner always gets access permission for accesses that |
| 2006 | * would normally be checked at open time. This is to make |
| 2007 | * file access work even when the client has done a fchmod(fd, 0). |
| 2008 | * |
| 2009 | * However, `cp foo bar' should fail nevertheless when bar is |
| 2010 | * readonly. A sensible way to do this might be to reject all |
| 2011 | * attempts to truncate a read-only file, because a creat() call |
| 2012 | * always implies file truncation. |
| 2013 | * ... but this isn't really fair. A process may reasonably call |
| 2014 | * ftruncate on an open file descriptor on a file with perm 000. |
| 2015 | * We must trust the client to do permission checking - using "ACCESS" |
| 2016 | * with NFSv3. |
| 2017 | */ |
Miklos Szeredi | 8837abc | 2008-06-16 13:20:29 +0200 | [diff] [blame] | 2018 | if ((acc & NFSD_MAY_OWNER_OVERRIDE) && |
David Howells | 5cc0a84 | 2008-11-14 10:38:58 +1100 | [diff] [blame] | 2019 | inode->i_uid == current_fsuid()) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2020 | return 0; |
| 2021 | |
Miklos Szeredi | 8837abc | 2008-06-16 13:20:29 +0200 | [diff] [blame] | 2022 | /* This assumes NFSD_MAY_{READ,WRITE,EXEC} == MAY_{READ,WRITE,EXEC} */ |
Al Viro | f419a2e | 2008-07-22 00:07:17 -0400 | [diff] [blame] | 2023 | err = inode_permission(inode, acc & (MAY_READ|MAY_WRITE|MAY_EXEC)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2024 | |
| 2025 | /* Allow read access to binaries even when mode 111 */ |
| 2026 | if (err == -EACCES && S_ISREG(inode->i_mode) && |
Miklos Szeredi | 8837abc | 2008-06-16 13:20:29 +0200 | [diff] [blame] | 2027 | acc == (NFSD_MAY_READ | NFSD_MAY_OWNER_OVERRIDE)) |
Al Viro | f419a2e | 2008-07-22 00:07:17 -0400 | [diff] [blame] | 2028 | err = inode_permission(inode, MAY_EXEC); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2029 | |
| 2030 | return err? nfserrno(err) : 0; |
| 2031 | } |
| 2032 | |
| 2033 | void |
| 2034 | nfsd_racache_shutdown(void) |
| 2035 | { |
Jeff Layton | 54a66e5 | 2008-08-13 22:03:27 -0400 | [diff] [blame] | 2036 | struct raparms *raparm, *last_raparm; |
| 2037 | unsigned int i; |
| 2038 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2039 | dprintk("nfsd: freeing readahead buffers.\n"); |
Jeff Layton | 54a66e5 | 2008-08-13 22:03:27 -0400 | [diff] [blame] | 2040 | |
| 2041 | for (i = 0; i < RAPARM_HASH_SIZE; i++) { |
| 2042 | raparm = raparm_hash[i].pb_head; |
| 2043 | while(raparm) { |
| 2044 | last_raparm = raparm; |
| 2045 | raparm = raparm->p_next; |
| 2046 | kfree(last_raparm); |
| 2047 | } |
| 2048 | raparm_hash[i].pb_head = NULL; |
| 2049 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2050 | } |
| 2051 | /* |
| 2052 | * Initialize readahead param cache |
| 2053 | */ |
| 2054 | int |
| 2055 | nfsd_racache_init(int cache_size) |
| 2056 | { |
| 2057 | int i; |
Greg Banks | fce1456 | 2006-10-04 02:15:49 -0700 | [diff] [blame] | 2058 | int j = 0; |
| 2059 | int nperbucket; |
Jeff Layton | 54a66e5 | 2008-08-13 22:03:27 -0400 | [diff] [blame] | 2060 | struct raparms **raparm = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2061 | |
Greg Banks | fce1456 | 2006-10-04 02:15:49 -0700 | [diff] [blame] | 2062 | |
Jeff Layton | 54a66e5 | 2008-08-13 22:03:27 -0400 | [diff] [blame] | 2063 | if (raparm_hash[0].pb_head) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2064 | return 0; |
Jeff Layton | 54a66e5 | 2008-08-13 22:03:27 -0400 | [diff] [blame] | 2065 | nperbucket = DIV_ROUND_UP(cache_size, RAPARM_HASH_SIZE); |
| 2066 | if (nperbucket < 2) |
| 2067 | nperbucket = 2; |
| 2068 | cache_size = nperbucket * RAPARM_HASH_SIZE; |
Yan Burman | 4b3bb06 | 2006-12-08 02:39:41 -0800 | [diff] [blame] | 2069 | |
| 2070 | dprintk("nfsd: allocating %d readahead buffers.\n", cache_size); |
Jeff Layton | 54a66e5 | 2008-08-13 22:03:27 -0400 | [diff] [blame] | 2071 | |
| 2072 | for (i = 0; i < RAPARM_HASH_SIZE; i++) { |
Yan Burman | 4b3bb06 | 2006-12-08 02:39:41 -0800 | [diff] [blame] | 2073 | spin_lock_init(&raparm_hash[i].pb_lock); |
Jeff Layton | 54a66e5 | 2008-08-13 22:03:27 -0400 | [diff] [blame] | 2074 | |
| 2075 | raparm = &raparm_hash[i].pb_head; |
| 2076 | for (j = 0; j < nperbucket; j++) { |
| 2077 | *raparm = kzalloc(sizeof(struct raparms), GFP_KERNEL); |
| 2078 | if (!*raparm) |
| 2079 | goto out_nomem; |
| 2080 | raparm = &(*raparm)->p_next; |
| 2081 | } |
| 2082 | *raparm = NULL; |
Yan Burman | 4b3bb06 | 2006-12-08 02:39:41 -0800 | [diff] [blame] | 2083 | } |
| 2084 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2085 | nfsdstats.ra_size = cache_size; |
| 2086 | return 0; |
Jeff Layton | 54a66e5 | 2008-08-13 22:03:27 -0400 | [diff] [blame] | 2087 | |
| 2088 | out_nomem: |
| 2089 | dprintk("nfsd: kmalloc failed, freeing readahead buffers\n"); |
| 2090 | nfsd_racache_shutdown(); |
| 2091 | return -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2092 | } |
Andreas Gruenbacher | a257cdd | 2005-06-22 17:16:26 +0000 | [diff] [blame] | 2093 | |
| 2094 | #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) |
| 2095 | struct posix_acl * |
| 2096 | nfsd_get_posix_acl(struct svc_fh *fhp, int type) |
| 2097 | { |
| 2098 | struct inode *inode = fhp->fh_dentry->d_inode; |
| 2099 | char *name; |
| 2100 | void *value = NULL; |
| 2101 | ssize_t size; |
| 2102 | struct posix_acl *acl; |
| 2103 | |
Christoph Hellwig | 5be196e | 2006-01-09 20:51:55 -0800 | [diff] [blame] | 2104 | if (!IS_POSIXACL(inode)) |
Andreas Gruenbacher | a257cdd | 2005-06-22 17:16:26 +0000 | [diff] [blame] | 2105 | return ERR_PTR(-EOPNOTSUPP); |
Christoph Hellwig | 5be196e | 2006-01-09 20:51:55 -0800 | [diff] [blame] | 2106 | |
| 2107 | switch (type) { |
| 2108 | case ACL_TYPE_ACCESS: |
| 2109 | name = POSIX_ACL_XATTR_ACCESS; |
| 2110 | break; |
| 2111 | case ACL_TYPE_DEFAULT: |
| 2112 | name = POSIX_ACL_XATTR_DEFAULT; |
| 2113 | break; |
| 2114 | default: |
| 2115 | return ERR_PTR(-EOPNOTSUPP); |
Andreas Gruenbacher | a257cdd | 2005-06-22 17:16:26 +0000 | [diff] [blame] | 2116 | } |
| 2117 | |
Christoph Hellwig | 5be196e | 2006-01-09 20:51:55 -0800 | [diff] [blame] | 2118 | size = nfsd_getxattr(fhp->fh_dentry, name, &value); |
| 2119 | if (size < 0) |
| 2120 | return ERR_PTR(size); |
Andreas Gruenbacher | a257cdd | 2005-06-22 17:16:26 +0000 | [diff] [blame] | 2121 | |
Andreas Gruenbacher | a257cdd | 2005-06-22 17:16:26 +0000 | [diff] [blame] | 2122 | acl = posix_acl_from_xattr(value, size); |
Andreas Gruenbacher | a257cdd | 2005-06-22 17:16:26 +0000 | [diff] [blame] | 2123 | kfree(value); |
| 2124 | return acl; |
| 2125 | } |
| 2126 | |
| 2127 | int |
| 2128 | nfsd_set_posix_acl(struct svc_fh *fhp, int type, struct posix_acl *acl) |
| 2129 | { |
| 2130 | struct inode *inode = fhp->fh_dentry->d_inode; |
| 2131 | char *name; |
| 2132 | void *value = NULL; |
| 2133 | size_t size; |
| 2134 | int error; |
| 2135 | |
Al Viro | acfa438 | 2008-12-04 10:06:33 -0500 | [diff] [blame] | 2136 | if (!IS_POSIXACL(inode) || |
Andreas Gruenbacher | a257cdd | 2005-06-22 17:16:26 +0000 | [diff] [blame] | 2137 | !inode->i_op->setxattr || !inode->i_op->removexattr) |
| 2138 | return -EOPNOTSUPP; |
| 2139 | switch(type) { |
| 2140 | case ACL_TYPE_ACCESS: |
Christoph Hellwig | 334a13e | 2005-06-28 20:44:58 -0700 | [diff] [blame] | 2141 | name = POSIX_ACL_XATTR_ACCESS; |
Andreas Gruenbacher | a257cdd | 2005-06-22 17:16:26 +0000 | [diff] [blame] | 2142 | break; |
| 2143 | case ACL_TYPE_DEFAULT: |
Christoph Hellwig | 334a13e | 2005-06-28 20:44:58 -0700 | [diff] [blame] | 2144 | name = POSIX_ACL_XATTR_DEFAULT; |
Andreas Gruenbacher | a257cdd | 2005-06-22 17:16:26 +0000 | [diff] [blame] | 2145 | break; |
| 2146 | default: |
| 2147 | return -EOPNOTSUPP; |
| 2148 | } |
| 2149 | |
| 2150 | if (acl && acl->a_count) { |
Christoph Hellwig | 334a13e | 2005-06-28 20:44:58 -0700 | [diff] [blame] | 2151 | size = posix_acl_xattr_size(acl->a_count); |
Andreas Gruenbacher | a257cdd | 2005-06-22 17:16:26 +0000 | [diff] [blame] | 2152 | value = kmalloc(size, GFP_KERNEL); |
| 2153 | if (!value) |
| 2154 | return -ENOMEM; |
Florin Malita | 9ccfc29 | 2006-05-20 14:59:58 -0700 | [diff] [blame] | 2155 | error = posix_acl_to_xattr(acl, value, size); |
| 2156 | if (error < 0) |
Andreas Gruenbacher | a257cdd | 2005-06-22 17:16:26 +0000 | [diff] [blame] | 2157 | goto getout; |
Florin Malita | 9ccfc29 | 2006-05-20 14:59:58 -0700 | [diff] [blame] | 2158 | size = error; |
Andreas Gruenbacher | a257cdd | 2005-06-22 17:16:26 +0000 | [diff] [blame] | 2159 | } else |
| 2160 | size = 0; |
| 2161 | |
Dave Hansen | 18f335a | 2008-02-15 14:37:38 -0800 | [diff] [blame] | 2162 | error = mnt_want_write(fhp->fh_export->ex_path.mnt); |
| 2163 | if (error) |
| 2164 | goto getout; |
Andreas Gruenbacher | a257cdd | 2005-06-22 17:16:26 +0000 | [diff] [blame] | 2165 | if (size) |
Christoph Hellwig | 5be196e | 2006-01-09 20:51:55 -0800 | [diff] [blame] | 2166 | error = vfs_setxattr(fhp->fh_dentry, name, value, size, 0); |
Andreas Gruenbacher | a257cdd | 2005-06-22 17:16:26 +0000 | [diff] [blame] | 2167 | else { |
| 2168 | if (!S_ISDIR(inode->i_mode) && type == ACL_TYPE_DEFAULT) |
| 2169 | error = 0; |
| 2170 | else { |
Christoph Hellwig | 5be196e | 2006-01-09 20:51:55 -0800 | [diff] [blame] | 2171 | error = vfs_removexattr(fhp->fh_dentry, name); |
Andreas Gruenbacher | a257cdd | 2005-06-22 17:16:26 +0000 | [diff] [blame] | 2172 | if (error == -ENODATA) |
| 2173 | error = 0; |
| 2174 | } |
| 2175 | } |
Dave Hansen | 18f335a | 2008-02-15 14:37:38 -0800 | [diff] [blame] | 2176 | mnt_drop_write(fhp->fh_export->ex_path.mnt); |
Andreas Gruenbacher | a257cdd | 2005-06-22 17:16:26 +0000 | [diff] [blame] | 2177 | |
| 2178 | getout: |
| 2179 | kfree(value); |
| 2180 | return error; |
| 2181 | } |
| 2182 | #endif /* defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) */ |