Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2 | * File operations used by nfsd. Some of these have been ripped from |
| 3 | * other parts of the kernel because they weren't exported, others |
| 4 | * are partial duplicates with added or changed functionality. |
| 5 | * |
| 6 | * Note that several functions dget() the dentry upon which they want |
| 7 | * to act, most notably those that create directory entries. Response |
| 8 | * dentry's are dput()'d if necessary in the release callback. |
| 9 | * So if you notice code paths that apparently fail to dput() the |
| 10 | * dentry, don't worry--they have been taken care of. |
| 11 | * |
| 12 | * Copyright (C) 1995-1999 Olaf Kirch <okir@monad.swb.de> |
| 13 | * Zerocpy NFS support (C) 2002 Hirokazu Takahashi <taka@valinux.co.jp> |
| 14 | */ |
| 15 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 16 | #include <linux/fs.h> |
| 17 | #include <linux/file.h> |
Jens Axboe | d6b29d7 | 2007-06-04 09:59:47 +0200 | [diff] [blame] | 18 | #include <linux/splice.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 19 | #include <linux/fcntl.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 20 | #include <linux/namei.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 21 | #include <linux/delay.h> |
Robert Love | 0eeca28 | 2005-07-12 17:06:03 -0400 | [diff] [blame] | 22 | #include <linux/fsnotify.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 23 | #include <linux/posix_acl_xattr.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 24 | #include <linux/xattr.h> |
Boaz Harrosh | 9a74af2 | 2009-12-03 20:30:56 +0200 | [diff] [blame] | 25 | #include <linux/jhash.h> |
| 26 | #include <linux/ima.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 27 | #include <linux/slab.h> |
Boaz Harrosh | 9a74af2 | 2009-12-03 20:30:56 +0200 | [diff] [blame] | 28 | #include <asm/uaccess.h> |
Ben Myers | f501912 | 2010-02-17 14:05:11 -0600 | [diff] [blame] | 29 | #include <linux/exportfs.h> |
| 30 | #include <linux/writeback.h> |
Boaz Harrosh | 9a74af2 | 2009-12-03 20:30:56 +0200 | [diff] [blame] | 31 | |
| 32 | #ifdef CONFIG_NFSD_V3 |
| 33 | #include "xdr3.h" |
| 34 | #endif /* CONFIG_NFSD_V3 */ |
| 35 | |
Christoph Hellwig | 5be196e | 2006-01-09 20:51:55 -0800 | [diff] [blame] | 36 | #ifdef CONFIG_NFSD_V4 |
J. Bruce Fields | 2ca72e1 | 2011-01-04 17:37:15 -0500 | [diff] [blame] | 37 | #include "acl.h" |
| 38 | #include "idmap.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 39 | #endif /* CONFIG_NFSD_V4 */ |
| 40 | |
Boaz Harrosh | 9a74af2 | 2009-12-03 20:30:56 +0200 | [diff] [blame] | 41 | #include "nfsd.h" |
| 42 | #include "vfs.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 43 | |
| 44 | #define NFSDDBG_FACILITY NFSDDBG_FILEOP |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 45 | |
| 46 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 47 | /* |
| 48 | * This is a cache of readahead params that help us choose the proper |
| 49 | * readahead strategy. Initially, we set all readahead parameters to 0 |
| 50 | * and let the VFS handle things. |
| 51 | * If you increase the number of cached files very much, you'll need to |
| 52 | * add a hash table here. |
| 53 | */ |
| 54 | struct raparms { |
| 55 | struct raparms *p_next; |
| 56 | unsigned int p_count; |
| 57 | ino_t p_ino; |
| 58 | dev_t p_dev; |
| 59 | int p_set; |
| 60 | struct file_ra_state p_ra; |
Greg Banks | fce1456 | 2006-10-04 02:15:49 -0700 | [diff] [blame] | 61 | unsigned int p_hindex; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 62 | }; |
| 63 | |
Greg Banks | fce1456 | 2006-10-04 02:15:49 -0700 | [diff] [blame] | 64 | struct raparm_hbucket { |
| 65 | struct raparms *pb_head; |
| 66 | spinlock_t pb_lock; |
| 67 | } ____cacheline_aligned_in_smp; |
| 68 | |
Greg Banks | fce1456 | 2006-10-04 02:15:49 -0700 | [diff] [blame] | 69 | #define RAPARM_HASH_BITS 4 |
| 70 | #define RAPARM_HASH_SIZE (1<<RAPARM_HASH_BITS) |
| 71 | #define RAPARM_HASH_MASK (RAPARM_HASH_SIZE-1) |
| 72 | static struct raparm_hbucket raparm_hash[RAPARM_HASH_SIZE]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 73 | |
| 74 | /* |
| 75 | * Called from nfsd_lookup and encode_dirent. Check if we have crossed |
| 76 | * a mount point. |
J.Bruce Fields | e0bb89e | 2006-12-13 00:35:25 -0800 | [diff] [blame] | 77 | * Returns -EAGAIN or -ETIMEDOUT leaving *dpp and *expp unchanged, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 78 | * or nfs_ok having possibly changed *dpp and *expp |
| 79 | */ |
| 80 | int |
| 81 | nfsd_cross_mnt(struct svc_rqst *rqstp, struct dentry **dpp, |
| 82 | struct svc_export **expp) |
| 83 | { |
| 84 | struct svc_export *exp = *expp, *exp2 = NULL; |
| 85 | struct dentry *dentry = *dpp; |
Al Viro | 91c9fa8 | 2009-04-18 02:42:05 -0400 | [diff] [blame] | 86 | struct path path = {.mnt = mntget(exp->ex_path.mnt), |
| 87 | .dentry = dget(dentry)}; |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 88 | int err = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 89 | |
Al Viro | 7cc90cc | 2011-03-18 09:04:20 -0400 | [diff] [blame] | 90 | err = follow_down(&path); |
David Howells | cc53ce5 | 2011-01-14 18:45:26 +0000 | [diff] [blame] | 91 | if (err < 0) |
| 92 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 93 | |
Al Viro | 91c9fa8 | 2009-04-18 02:42:05 -0400 | [diff] [blame] | 94 | exp2 = rqst_exp_get_by_name(rqstp, &path); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 95 | if (IS_ERR(exp2)) { |
J. Bruce Fields | 3b6cee7b | 2009-10-25 21:18:19 -0400 | [diff] [blame] | 96 | err = PTR_ERR(exp2); |
| 97 | /* |
| 98 | * We normally allow NFS clients to continue |
| 99 | * "underneath" a mountpoint that is not exported. |
| 100 | * The exception is V4ROOT, where no traversal is ever |
| 101 | * allowed without an explicit export of the new |
| 102 | * directory. |
| 103 | */ |
| 104 | if (err == -ENOENT && !(exp->ex_flags & NFSEXP_V4ROOT)) |
| 105 | err = 0; |
Al Viro | 91c9fa8 | 2009-04-18 02:42:05 -0400 | [diff] [blame] | 106 | path_put(&path); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 107 | goto out; |
| 108 | } |
Steve Dickson | 3c394dd | 2009-09-09 15:02:40 -0400 | [diff] [blame] | 109 | if (nfsd_v4client(rqstp) || |
| 110 | (exp->ex_flags & NFSEXP_CROSSMOUNT) || EX_NOHIDE(exp2)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 111 | /* successfully crossed mount point */ |
Al Viro | 1644ccc | 2009-04-18 02:32:31 -0400 | [diff] [blame] | 112 | /* |
Al Viro | 91c9fa8 | 2009-04-18 02:42:05 -0400 | [diff] [blame] | 113 | * This is subtle: path.dentry is *not* on path.mnt |
| 114 | * at this point. The only reason we are safe is that |
| 115 | * original mnt is pinned down by exp, so we should |
| 116 | * put path *before* putting exp |
Al Viro | 1644ccc | 2009-04-18 02:32:31 -0400 | [diff] [blame] | 117 | */ |
Al Viro | 91c9fa8 | 2009-04-18 02:42:05 -0400 | [diff] [blame] | 118 | *dpp = path.dentry; |
| 119 | path.dentry = dentry; |
Al Viro | 1644ccc | 2009-04-18 02:32:31 -0400 | [diff] [blame] | 120 | *expp = exp2; |
Al Viro | 91c9fa8 | 2009-04-18 02:42:05 -0400 | [diff] [blame] | 121 | exp2 = exp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 122 | } |
Al Viro | 91c9fa8 | 2009-04-18 02:42:05 -0400 | [diff] [blame] | 123 | path_put(&path); |
| 124 | exp_put(exp2); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 125 | out: |
| 126 | return err; |
| 127 | } |
| 128 | |
J. Bruce Fields | 289ede4 | 2009-09-26 20:32:24 -0400 | [diff] [blame] | 129 | static void follow_to_parent(struct path *path) |
| 130 | { |
| 131 | struct dentry *dp; |
| 132 | |
| 133 | while (path->dentry == path->mnt->mnt_root && follow_up(path)) |
| 134 | ; |
| 135 | dp = dget_parent(path->dentry); |
| 136 | dput(path->dentry); |
| 137 | path->dentry = dp; |
| 138 | } |
| 139 | |
| 140 | static int nfsd_lookup_parent(struct svc_rqst *rqstp, struct dentry *dparent, struct svc_export **exp, struct dentry **dentryp) |
| 141 | { |
| 142 | struct svc_export *exp2; |
| 143 | struct path path = {.mnt = mntget((*exp)->ex_path.mnt), |
| 144 | .dentry = dget(dparent)}; |
| 145 | |
| 146 | follow_to_parent(&path); |
| 147 | |
| 148 | exp2 = rqst_exp_parent(rqstp, &path); |
| 149 | if (PTR_ERR(exp2) == -ENOENT) { |
| 150 | *dentryp = dget(dparent); |
| 151 | } else if (IS_ERR(exp2)) { |
| 152 | path_put(&path); |
| 153 | return PTR_ERR(exp2); |
| 154 | } else { |
| 155 | *dentryp = dget(path.dentry); |
| 156 | exp_put(*exp); |
| 157 | *exp = exp2; |
| 158 | } |
| 159 | path_put(&path); |
| 160 | return 0; |
| 161 | } |
| 162 | |
J. Bruce Fields | 82ead7f | 2009-10-25 21:33:15 -0400 | [diff] [blame] | 163 | /* |
| 164 | * For nfsd purposes, we treat V4ROOT exports as though there was an |
| 165 | * export at *every* directory. |
| 166 | */ |
J. Bruce Fields | 3227fa4 | 2009-10-25 21:43:01 -0400 | [diff] [blame] | 167 | int nfsd_mountpoint(struct dentry *dentry, struct svc_export *exp) |
J. Bruce Fields | 82ead7f | 2009-10-25 21:33:15 -0400 | [diff] [blame] | 168 | { |
| 169 | if (d_mountpoint(dentry)) |
| 170 | return 1; |
Trond Myklebust | 11fcee0 | 2011-09-12 19:37:26 -0400 | [diff] [blame] | 171 | if (nfsd4_is_junction(dentry)) |
| 172 | return 1; |
J. Bruce Fields | 82ead7f | 2009-10-25 21:33:15 -0400 | [diff] [blame] | 173 | if (!(exp->ex_flags & NFSEXP_V4ROOT)) |
| 174 | return 0; |
| 175 | return dentry->d_inode != NULL; |
| 176 | } |
| 177 | |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 178 | __be32 |
J. Bruce Fields | 6c0a654 | 2007-07-17 04:04:47 -0700 | [diff] [blame] | 179 | nfsd_lookup_dentry(struct svc_rqst *rqstp, struct svc_fh *fhp, |
Chuck Lever | 5a022fc | 2007-11-01 16:57:09 -0400 | [diff] [blame] | 180 | const char *name, unsigned int len, |
J. Bruce Fields | 6c0a654 | 2007-07-17 04:04:47 -0700 | [diff] [blame] | 181 | struct svc_export **exp_ret, struct dentry **dentry_ret) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 182 | { |
| 183 | struct svc_export *exp; |
| 184 | struct dentry *dparent; |
| 185 | struct dentry *dentry; |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 186 | int host_err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 187 | |
| 188 | dprintk("nfsd: nfsd_lookup(fh %s, %.*s)\n", SVCFH_fmt(fhp), len,name); |
| 189 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 190 | dparent = fhp->fh_dentry; |
| 191 | exp = fhp->fh_export; |
| 192 | exp_get(exp); |
| 193 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 194 | /* Lookup the name, but don't follow links */ |
| 195 | if (isdotent(name, len)) { |
| 196 | if (len==1) |
| 197 | dentry = dget(dparent); |
Jan Blunck | 5477549 | 2008-02-14 19:38:39 -0800 | [diff] [blame] | 198 | else if (dparent != exp->ex_path.dentry) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 199 | dentry = dget_parent(dparent); |
J. Bruce Fields | fed8381 | 2009-09-26 16:53:01 -0400 | [diff] [blame] | 200 | else if (!EX_NOHIDE(exp) && !nfsd_v4client(rqstp)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 201 | dentry = dget(dparent); /* .. == . just like at / */ |
| 202 | else { |
| 203 | /* checking mountpoint crossing is very different when stepping up */ |
J. Bruce Fields | 289ede4 | 2009-09-26 20:32:24 -0400 | [diff] [blame] | 204 | host_err = nfsd_lookup_parent(rqstp, dparent, &exp, &dentry); |
| 205 | if (host_err) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 206 | goto out_nfserr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 207 | } |
| 208 | } else { |
| 209 | fh_lock(fhp); |
| 210 | dentry = lookup_one_len(name, dparent, len); |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 211 | host_err = PTR_ERR(dentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 212 | if (IS_ERR(dentry)) |
| 213 | goto out_nfserr; |
| 214 | /* |
| 215 | * check if we have crossed a mount point ... |
| 216 | */ |
J. Bruce Fields | 82ead7f | 2009-10-25 21:33:15 -0400 | [diff] [blame] | 217 | if (nfsd_mountpoint(dentry, exp)) { |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 218 | if ((host_err = nfsd_cross_mnt(rqstp, &dentry, &exp))) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 219 | dput(dentry); |
| 220 | goto out_nfserr; |
| 221 | } |
| 222 | } |
| 223 | } |
J. Bruce Fields | 6c0a654 | 2007-07-17 04:04:47 -0700 | [diff] [blame] | 224 | *dentry_ret = dentry; |
| 225 | *exp_ret = exp; |
| 226 | return 0; |
| 227 | |
| 228 | out_nfserr: |
| 229 | exp_put(exp); |
| 230 | return nfserrno(host_err); |
| 231 | } |
| 232 | |
| 233 | /* |
| 234 | * Look up one component of a pathname. |
| 235 | * N.B. After this call _both_ fhp and resfh need an fh_put |
| 236 | * |
| 237 | * If the lookup would cross a mountpoint, and the mounted filesystem |
| 238 | * is exported to the client with NFSEXP_NOHIDE, then the lookup is |
| 239 | * accepted as it stands and the mounted directory is |
| 240 | * returned. Otherwise the covered directory is returned. |
| 241 | * NOTE: this mountpoint crossing is not supported properly by all |
| 242 | * clients and is explicitly disallowed for NFSv3 |
| 243 | * NeilBrown <neilb@cse.unsw.edu.au> |
| 244 | */ |
| 245 | __be32 |
| 246 | 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] | 247 | unsigned int len, struct svc_fh *resfh) |
J. Bruce Fields | 6c0a654 | 2007-07-17 04:04:47 -0700 | [diff] [blame] | 248 | { |
| 249 | struct svc_export *exp; |
| 250 | struct dentry *dentry; |
| 251 | __be32 err; |
| 252 | |
J. Bruce Fields | 29a78a3 | 2011-04-09 11:28:53 -0400 | [diff] [blame] | 253 | err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_EXEC); |
| 254 | if (err) |
| 255 | return err; |
J. Bruce Fields | 6c0a654 | 2007-07-17 04:04:47 -0700 | [diff] [blame] | 256 | err = nfsd_lookup_dentry(rqstp, fhp, name, len, &exp, &dentry); |
| 257 | if (err) |
| 258 | return err; |
Andy Adamson | 32c1eb0 | 2007-07-17 04:04:48 -0700 | [diff] [blame] | 259 | err = check_nfsd_access(exp, rqstp); |
| 260 | if (err) |
| 261 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 262 | /* |
| 263 | * Note: we compose the file handle now, but as the |
| 264 | * dentry may be negative, it may need to be updated. |
| 265 | */ |
| 266 | err = fh_compose(resfh, exp, dentry, fhp); |
| 267 | if (!err && !dentry->d_inode) |
| 268 | err = nfserr_noent; |
Andy Adamson | 32c1eb0 | 2007-07-17 04:04:48 -0700 | [diff] [blame] | 269 | out: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 270 | dput(dentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 271 | exp_put(exp); |
| 272 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 273 | } |
| 274 | |
J. Bruce Fields | 4795bb3 | 2011-01-11 13:55:46 -0500 | [diff] [blame] | 275 | static int nfsd_break_lease(struct inode *inode) |
| 276 | { |
| 277 | if (!S_ISREG(inode->i_mode)) |
| 278 | return 0; |
| 279 | return break_lease(inode, O_WRONLY | O_NONBLOCK); |
| 280 | } |
| 281 | |
Ben Myers | f501912 | 2010-02-17 14:05:11 -0600 | [diff] [blame] | 282 | /* |
| 283 | * Commit metadata changes to stable storage. |
| 284 | */ |
| 285 | static int |
| 286 | commit_metadata(struct svc_fh *fhp) |
| 287 | { |
| 288 | struct inode *inode = fhp->fh_dentry->d_inode; |
| 289 | const struct export_operations *export_ops = inode->i_sb->s_export_op; |
Ben Myers | f501912 | 2010-02-17 14:05:11 -0600 | [diff] [blame] | 290 | |
| 291 | if (!EX_ISSYNC(fhp->fh_export)) |
| 292 | return 0; |
| 293 | |
Christoph Hellwig | c376501 | 2010-10-06 10:48:20 +0200 | [diff] [blame] | 294 | if (export_ops->commit_metadata) |
| 295 | return export_ops->commit_metadata(inode); |
| 296 | return sync_inode_metadata(inode, 1); |
Ben Myers | f501912 | 2010-02-17 14:05:11 -0600 | [diff] [blame] | 297 | } |
J. Bruce Fields | 6c0a654 | 2007-07-17 04:04:47 -0700 | [diff] [blame] | 298 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 299 | /* |
| 300 | * Set various file attributes. |
| 301 | * N.B. After this call fhp needs an fh_put |
| 302 | */ |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 303 | __be32 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 304 | nfsd_setattr(struct svc_rqst *rqstp, struct svc_fh *fhp, struct iattr *iap, |
| 305 | int check_guard, time_t guardtime) |
| 306 | { |
| 307 | struct dentry *dentry; |
| 308 | struct inode *inode; |
Miklos Szeredi | 8837abc | 2008-06-16 13:20:29 +0200 | [diff] [blame] | 309 | int accmode = NFSD_MAY_SATTR; |
Al Viro | 175a4eb | 2011-07-26 03:30:54 -0400 | [diff] [blame] | 310 | umode_t ftype = 0; |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 311 | __be32 err; |
| 312 | int host_err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 313 | int size_change = 0; |
| 314 | |
| 315 | if (iap->ia_valid & (ATTR_ATIME | ATTR_MTIME | ATTR_SIZE)) |
Miklos Szeredi | 8837abc | 2008-06-16 13:20:29 +0200 | [diff] [blame] | 316 | accmode |= NFSD_MAY_WRITE|NFSD_MAY_OWNER_OVERRIDE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 317 | if (iap->ia_valid & ATTR_SIZE) |
| 318 | ftype = S_IFREG; |
| 319 | |
| 320 | /* Get inode */ |
| 321 | err = fh_verify(rqstp, fhp, ftype, accmode); |
NeilBrown | 15b7a1b | 2005-11-07 01:00:23 -0800 | [diff] [blame] | 322 | if (err) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 323 | goto out; |
| 324 | |
| 325 | dentry = fhp->fh_dentry; |
| 326 | inode = dentry->d_inode; |
| 327 | |
NeilBrown | 15b7a1b | 2005-11-07 01:00:23 -0800 | [diff] [blame] | 328 | /* Ignore any mode updates on symlinks */ |
| 329 | if (S_ISLNK(inode->i_mode)) |
| 330 | iap->ia_valid &= ~ATTR_MODE; |
| 331 | |
| 332 | if (!iap->ia_valid) |
| 333 | goto out; |
| 334 | |
Christoph Hellwig | 9c85fca | 2007-03-07 15:26:25 +0000 | [diff] [blame] | 335 | /* |
| 336 | * NFSv2 does not differentiate between "set-[ac]time-to-now" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 337 | * which only requires access, and "set-[ac]time-to-X" which |
| 338 | * requires ownership. |
| 339 | * So if it looks like it might be "set both to the same time which |
| 340 | * is close to now", and if inode_change_ok fails, then we |
| 341 | * convert to "set to now" instead of "set to explicit time" |
| 342 | * |
| 343 | * We only call inode_change_ok as the last test as technically |
| 344 | * it is not an interface that we should be using. It is only |
| 345 | * valid if the filesystem does not define it's own i_op->setattr. |
| 346 | */ |
| 347 | #define BOTH_TIME_SET (ATTR_ATIME_SET | ATTR_MTIME_SET) |
| 348 | #define MAX_TOUCH_TIME_ERROR (30*60) |
Christoph Hellwig | 9c85fca | 2007-03-07 15:26:25 +0000 | [diff] [blame] | 349 | if ((iap->ia_valid & BOTH_TIME_SET) == BOTH_TIME_SET && |
| 350 | iap->ia_mtime.tv_sec == iap->ia_atime.tv_sec) { |
| 351 | /* |
| 352 | * Looks probable. |
| 353 | * |
| 354 | * Now just make sure time is in the right ballpark. |
| 355 | * Solaris, at least, doesn't seem to care what the time |
| 356 | * request is. We require it be within 30 minutes of now. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 357 | */ |
Christoph Hellwig | 9c85fca | 2007-03-07 15:26:25 +0000 | [diff] [blame] | 358 | time_t delta = iap->ia_atime.tv_sec - get_seconds(); |
| 359 | if (delta < 0) |
| 360 | delta = -delta; |
| 361 | if (delta < MAX_TOUCH_TIME_ERROR && |
| 362 | inode_change_ok(inode, iap) != 0) { |
| 363 | /* |
| 364 | * Turn off ATTR_[AM]TIME_SET but leave ATTR_[AM]TIME. |
| 365 | * This will cause notify_change to set these times |
| 366 | * to "now" |
| 367 | */ |
| 368 | iap->ia_valid &= ~BOTH_TIME_SET; |
| 369 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 370 | } |
| 371 | |
Christoph Hellwig | 9c85fca | 2007-03-07 15:26:25 +0000 | [diff] [blame] | 372 | /* |
| 373 | * The size case is special. |
| 374 | * It changes the file as well as the attributes. |
| 375 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 376 | if (iap->ia_valid & ATTR_SIZE) { |
| 377 | if (iap->ia_size < inode->i_size) { |
Miklos Szeredi | 8837abc | 2008-06-16 13:20:29 +0200 | [diff] [blame] | 378 | err = nfsd_permission(rqstp, fhp->fh_export, dentry, |
| 379 | NFSD_MAY_TRUNC|NFSD_MAY_OWNER_OVERRIDE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 380 | if (err) |
| 381 | goto out; |
| 382 | } |
| 383 | |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 384 | host_err = get_write_access(inode); |
| 385 | if (host_err) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 386 | goto out_nfserr; |
| 387 | |
| 388 | size_change = 1; |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 389 | host_err = locks_verify_truncate(inode, NULL, iap->ia_size); |
| 390 | if (host_err) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 391 | put_write_access(inode); |
| 392 | goto out_nfserr; |
| 393 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 394 | } |
| 395 | |
Jeff Layton | ca45625 | 2008-04-16 16:28:47 -0400 | [diff] [blame] | 396 | /* sanitize the mode change */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 397 | if (iap->ia_valid & ATTR_MODE) { |
| 398 | iap->ia_mode &= S_IALLUGO; |
Jeff Layton | dee3209 | 2008-04-16 16:28:46 -0400 | [diff] [blame] | 399 | iap->ia_mode |= (inode->i_mode & ~S_IALLUGO); |
Jeff Layton | ca45625 | 2008-04-16 16:28:47 -0400 | [diff] [blame] | 400 | } |
| 401 | |
| 402 | /* Revoke setuid/setgid on chown */ |
Sachin S. Prabhu | 0953e62 | 2009-02-23 16:22:03 +0000 | [diff] [blame] | 403 | if (!S_ISDIR(inode->i_mode) && |
| 404 | (((iap->ia_valid & ATTR_UID) && iap->ia_uid != inode->i_uid) || |
| 405 | ((iap->ia_valid & ATTR_GID) && iap->ia_gid != inode->i_gid))) { |
Jeff Layton | ca45625 | 2008-04-16 16:28:47 -0400 | [diff] [blame] | 406 | iap->ia_valid |= ATTR_KILL_PRIV; |
| 407 | if (iap->ia_valid & ATTR_MODE) { |
| 408 | /* we're setting mode too, just clear the s*id bits */ |
Jeff Layton | 8a0ce7d | 2007-10-18 03:05:19 -0700 | [diff] [blame] | 409 | iap->ia_mode &= ~S_ISUID; |
Jeff Layton | ca45625 | 2008-04-16 16:28:47 -0400 | [diff] [blame] | 410 | if (iap->ia_mode & S_IXGRP) |
| 411 | iap->ia_mode &= ~S_ISGID; |
| 412 | } else { |
| 413 | /* set ATTR_KILL_* bits and let VFS handle it */ |
| 414 | iap->ia_valid |= (ATTR_KILL_SUID | ATTR_KILL_SGID); |
Jeff Layton | 8a0ce7d | 2007-10-18 03:05:19 -0700 | [diff] [blame] | 415 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 416 | } |
| 417 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 418 | /* Change the attributes. */ |
| 419 | |
| 420 | iap->ia_valid |= ATTR_CTIME; |
| 421 | |
| 422 | err = nfserr_notsync; |
| 423 | if (!check_guard || guardtime == inode->i_ctime.tv_sec) { |
J. Bruce Fields | 4795bb3 | 2011-01-11 13:55:46 -0500 | [diff] [blame] | 424 | host_err = nfsd_break_lease(inode); |
J. Bruce Fields | 6a76beb | 2011-01-11 12:54:39 -0500 | [diff] [blame] | 425 | if (host_err) |
| 426 | goto out_nfserr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 427 | fh_lock(fhp); |
J. Bruce Fields | 6a76beb | 2011-01-11 12:54:39 -0500 | [diff] [blame] | 428 | |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 429 | host_err = notify_change(dentry, iap); |
| 430 | err = nfserrno(host_err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 431 | fh_unlock(fhp); |
| 432 | } |
| 433 | if (size_change) |
| 434 | put_write_access(inode); |
| 435 | if (!err) |
Christoph Hellwig | b160fda | 2010-06-01 21:59:18 +0200 | [diff] [blame] | 436 | commit_metadata(fhp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 437 | out: |
| 438 | return err; |
| 439 | |
| 440 | out_nfserr: |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 441 | err = nfserrno(host_err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 442 | goto out; |
| 443 | } |
| 444 | |
Christoph Hellwig | 5be196e | 2006-01-09 20:51:55 -0800 | [diff] [blame] | 445 | #if defined(CONFIG_NFSD_V2_ACL) || \ |
| 446 | defined(CONFIG_NFSD_V3_ACL) || \ |
| 447 | defined(CONFIG_NFSD_V4) |
| 448 | static ssize_t nfsd_getxattr(struct dentry *dentry, char *key, void **buf) |
| 449 | { |
| 450 | ssize_t buflen; |
Krishna Kumar | 6c6a426 | 2008-10-22 14:48:36 +0530 | [diff] [blame] | 451 | ssize_t ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 452 | |
Christoph Hellwig | 5be196e | 2006-01-09 20:51:55 -0800 | [diff] [blame] | 453 | buflen = vfs_getxattr(dentry, key, NULL, 0); |
| 454 | if (buflen <= 0) |
| 455 | return buflen; |
| 456 | |
| 457 | *buf = kmalloc(buflen, GFP_KERNEL); |
| 458 | if (!*buf) |
| 459 | return -ENOMEM; |
| 460 | |
Krishna Kumar | 6c6a426 | 2008-10-22 14:48:36 +0530 | [diff] [blame] | 461 | ret = vfs_getxattr(dentry, key, *buf, buflen); |
| 462 | if (ret < 0) |
| 463 | kfree(*buf); |
| 464 | return ret; |
Christoph Hellwig | 5be196e | 2006-01-09 20:51:55 -0800 | [diff] [blame] | 465 | } |
| 466 | #endif |
| 467 | |
| 468 | #if defined(CONFIG_NFSD_V4) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 469 | static int |
| 470 | set_nfsv4_acl_one(struct dentry *dentry, struct posix_acl *pacl, char *key) |
| 471 | { |
| 472 | int len; |
| 473 | size_t buflen; |
| 474 | char *buf = NULL; |
| 475 | int error = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 476 | |
| 477 | buflen = posix_acl_xattr_size(pacl->a_count); |
| 478 | buf = kmalloc(buflen, GFP_KERNEL); |
| 479 | error = -ENOMEM; |
| 480 | if (buf == NULL) |
| 481 | goto out; |
| 482 | |
| 483 | len = posix_acl_to_xattr(pacl, buf, buflen); |
| 484 | if (len < 0) { |
| 485 | error = len; |
| 486 | goto out; |
| 487 | } |
| 488 | |
Christoph Hellwig | 5be196e | 2006-01-09 20:51:55 -0800 | [diff] [blame] | 489 | error = vfs_setxattr(dentry, key, buf, len, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 490 | out: |
| 491 | kfree(buf); |
| 492 | return error; |
| 493 | } |
| 494 | |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 495 | __be32 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 496 | nfsd4_set_nfs4_acl(struct svc_rqst *rqstp, struct svc_fh *fhp, |
| 497 | struct nfs4_acl *acl) |
| 498 | { |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 499 | __be32 error; |
| 500 | int host_error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 501 | struct dentry *dentry; |
| 502 | struct inode *inode; |
| 503 | struct posix_acl *pacl = NULL, *dpacl = NULL; |
| 504 | unsigned int flags = 0; |
| 505 | |
| 506 | /* Get inode */ |
J. Bruce Fields | e281d81 | 2011-08-15 16:57:07 -0400 | [diff] [blame] | 507 | error = fh_verify(rqstp, fhp, 0, NFSD_MAY_SATTR); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 508 | if (error) |
J. Bruce Fields | 4b2ca38 | 2007-07-17 04:04:37 -0700 | [diff] [blame] | 509 | return error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 510 | |
| 511 | dentry = fhp->fh_dentry; |
| 512 | inode = dentry->d_inode; |
| 513 | if (S_ISDIR(inode->i_mode)) |
| 514 | flags = NFS4_ACL_DIR; |
| 515 | |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 516 | host_error = nfs4_acl_nfsv4_to_posix(acl, &pacl, &dpacl, flags); |
| 517 | if (host_error == -EINVAL) { |
J. Bruce Fields | 4b2ca38 | 2007-07-17 04:04:37 -0700 | [diff] [blame] | 518 | return nfserr_attrnotsupp; |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 519 | } else if (host_error < 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 520 | goto out_nfserr; |
| 521 | |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 522 | host_error = set_nfsv4_acl_one(dentry, pacl, POSIX_ACL_XATTR_ACCESS); |
| 523 | if (host_error < 0) |
J. Bruce Fields | 4b2ca38 | 2007-07-17 04:04:37 -0700 | [diff] [blame] | 524 | goto out_release; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 525 | |
J. Bruce Fields | 4b2ca38 | 2007-07-17 04:04:37 -0700 | [diff] [blame] | 526 | if (S_ISDIR(inode->i_mode)) |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 527 | host_error = set_nfsv4_acl_one(dentry, dpacl, POSIX_ACL_XATTR_DEFAULT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 528 | |
J. Bruce Fields | 4b2ca38 | 2007-07-17 04:04:37 -0700 | [diff] [blame] | 529 | out_release: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 530 | posix_acl_release(pacl); |
| 531 | posix_acl_release(dpacl); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 532 | out_nfserr: |
J. Bruce Fields | f34f924 | 2007-02-16 01:28:34 -0800 | [diff] [blame] | 533 | if (host_error == -EOPNOTSUPP) |
J. Bruce Fields | 4b2ca38 | 2007-07-17 04:04:37 -0700 | [diff] [blame] | 534 | return nfserr_attrnotsupp; |
J. Bruce Fields | f34f924 | 2007-02-16 01:28:34 -0800 | [diff] [blame] | 535 | else |
J. Bruce Fields | 4b2ca38 | 2007-07-17 04:04:37 -0700 | [diff] [blame] | 536 | return nfserrno(host_error); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 537 | } |
| 538 | |
| 539 | static struct posix_acl * |
| 540 | _get_posix_acl(struct dentry *dentry, char *key) |
| 541 | { |
Christoph Hellwig | 5be196e | 2006-01-09 20:51:55 -0800 | [diff] [blame] | 542 | void *buf = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 543 | struct posix_acl *pacl = NULL; |
Christoph Hellwig | 5be196e | 2006-01-09 20:51:55 -0800 | [diff] [blame] | 544 | int buflen; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 545 | |
Christoph Hellwig | 5be196e | 2006-01-09 20:51:55 -0800 | [diff] [blame] | 546 | buflen = nfsd_getxattr(dentry, key, &buf); |
| 547 | if (!buflen) |
| 548 | buflen = -ENODATA; |
| 549 | if (buflen <= 0) |
| 550 | return ERR_PTR(buflen); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 551 | |
| 552 | pacl = posix_acl_from_xattr(buf, buflen); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 553 | kfree(buf); |
| 554 | return pacl; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 555 | } |
| 556 | |
| 557 | int |
| 558 | nfsd4_get_nfs4_acl(struct svc_rqst *rqstp, struct dentry *dentry, struct nfs4_acl **acl) |
| 559 | { |
| 560 | struct inode *inode = dentry->d_inode; |
| 561 | int error = 0; |
| 562 | struct posix_acl *pacl = NULL, *dpacl = NULL; |
| 563 | unsigned int flags = 0; |
| 564 | |
Christoph Hellwig | 9a59f45 | 2005-06-23 00:10:19 -0700 | [diff] [blame] | 565 | pacl = _get_posix_acl(dentry, POSIX_ACL_XATTR_ACCESS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 566 | if (IS_ERR(pacl) && PTR_ERR(pacl) == -ENODATA) |
| 567 | pacl = posix_acl_from_mode(inode->i_mode, GFP_KERNEL); |
| 568 | if (IS_ERR(pacl)) { |
| 569 | error = PTR_ERR(pacl); |
| 570 | pacl = NULL; |
| 571 | goto out; |
| 572 | } |
| 573 | |
| 574 | if (S_ISDIR(inode->i_mode)) { |
Christoph Hellwig | 9a59f45 | 2005-06-23 00:10:19 -0700 | [diff] [blame] | 575 | dpacl = _get_posix_acl(dentry, POSIX_ACL_XATTR_DEFAULT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 576 | if (IS_ERR(dpacl) && PTR_ERR(dpacl) == -ENODATA) |
| 577 | dpacl = NULL; |
| 578 | else if (IS_ERR(dpacl)) { |
| 579 | error = PTR_ERR(dpacl); |
| 580 | dpacl = NULL; |
| 581 | goto out; |
| 582 | } |
| 583 | flags = NFS4_ACL_DIR; |
| 584 | } |
| 585 | |
| 586 | *acl = nfs4_acl_posix_to_nfsv4(pacl, dpacl, flags); |
| 587 | if (IS_ERR(*acl)) { |
| 588 | error = PTR_ERR(*acl); |
| 589 | *acl = NULL; |
| 590 | } |
| 591 | out: |
| 592 | posix_acl_release(pacl); |
| 593 | posix_acl_release(dpacl); |
| 594 | return error; |
| 595 | } |
| 596 | |
Chuck Lever | 9b4146e | 2012-01-04 16:26:43 -0500 | [diff] [blame] | 597 | /* |
| 598 | * NFS junction information is stored in an extended attribute. |
| 599 | */ |
| 600 | #define NFSD_JUNCTION_XATTR_NAME XATTR_TRUSTED_PREFIX "junction.nfs" |
| 601 | |
| 602 | /** |
| 603 | * nfsd4_is_junction - Test if an object could be an NFS junction |
| 604 | * |
| 605 | * @dentry: object to test |
| 606 | * |
| 607 | * Returns 1 if "dentry" appears to contain NFS junction information. |
| 608 | * Otherwise 0 is returned. |
| 609 | */ |
Trond Myklebust | 11fcee0 | 2011-09-12 19:37:26 -0400 | [diff] [blame] | 610 | int nfsd4_is_junction(struct dentry *dentry) |
| 611 | { |
| 612 | struct inode *inode = dentry->d_inode; |
| 613 | |
| 614 | if (inode == NULL) |
| 615 | return 0; |
| 616 | if (inode->i_mode & S_IXUGO) |
| 617 | return 0; |
| 618 | if (!(inode->i_mode & S_ISVTX)) |
| 619 | return 0; |
Chuck Lever | 9b4146e | 2012-01-04 16:26:43 -0500 | [diff] [blame] | 620 | if (vfs_getxattr(dentry, NFSD_JUNCTION_XATTR_NAME, NULL, 0) <= 0) |
Trond Myklebust | 11fcee0 | 2011-09-12 19:37:26 -0400 | [diff] [blame] | 621 | return 0; |
| 622 | return 1; |
| 623 | } |
J. Bruce Fields | 6a85d6c | 2010-07-06 12:39:12 -0400 | [diff] [blame] | 624 | #endif /* defined(CONFIG_NFSD_V4) */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 625 | |
| 626 | #ifdef CONFIG_NFSD_V3 |
| 627 | /* |
| 628 | * Check server access rights to a file system object |
| 629 | */ |
| 630 | struct accessmap { |
| 631 | u32 access; |
| 632 | int how; |
| 633 | }; |
| 634 | static struct accessmap nfs3_regaccess[] = { |
Miklos Szeredi | 8837abc | 2008-06-16 13:20:29 +0200 | [diff] [blame] | 635 | { NFS3_ACCESS_READ, NFSD_MAY_READ }, |
| 636 | { NFS3_ACCESS_EXECUTE, NFSD_MAY_EXEC }, |
| 637 | { NFS3_ACCESS_MODIFY, NFSD_MAY_WRITE|NFSD_MAY_TRUNC }, |
| 638 | { NFS3_ACCESS_EXTEND, NFSD_MAY_WRITE }, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 639 | |
| 640 | { 0, 0 } |
| 641 | }; |
| 642 | |
| 643 | static struct accessmap nfs3_diraccess[] = { |
Miklos Szeredi | 8837abc | 2008-06-16 13:20:29 +0200 | [diff] [blame] | 644 | { NFS3_ACCESS_READ, NFSD_MAY_READ }, |
| 645 | { NFS3_ACCESS_LOOKUP, NFSD_MAY_EXEC }, |
| 646 | { NFS3_ACCESS_MODIFY, NFSD_MAY_EXEC|NFSD_MAY_WRITE|NFSD_MAY_TRUNC}, |
| 647 | { NFS3_ACCESS_EXTEND, NFSD_MAY_EXEC|NFSD_MAY_WRITE }, |
| 648 | { NFS3_ACCESS_DELETE, NFSD_MAY_REMOVE }, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 649 | |
| 650 | { 0, 0 } |
| 651 | }; |
| 652 | |
| 653 | static struct accessmap nfs3_anyaccess[] = { |
| 654 | /* Some clients - Solaris 2.6 at least, make an access call |
| 655 | * to the server to check for access for things like /dev/null |
| 656 | * (which really, the server doesn't care about). So |
| 657 | * We provide simple access checking for them, looking |
| 658 | * mainly at mode bits, and we make sure to ignore read-only |
| 659 | * filesystem checks |
| 660 | */ |
Miklos Szeredi | 8837abc | 2008-06-16 13:20:29 +0200 | [diff] [blame] | 661 | { NFS3_ACCESS_READ, NFSD_MAY_READ }, |
| 662 | { NFS3_ACCESS_EXECUTE, NFSD_MAY_EXEC }, |
| 663 | { NFS3_ACCESS_MODIFY, NFSD_MAY_WRITE|NFSD_MAY_LOCAL_ACCESS }, |
| 664 | { NFS3_ACCESS_EXTEND, NFSD_MAY_WRITE|NFSD_MAY_LOCAL_ACCESS }, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 665 | |
| 666 | { 0, 0 } |
| 667 | }; |
| 668 | |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 669 | __be32 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 670 | nfsd_access(struct svc_rqst *rqstp, struct svc_fh *fhp, u32 *access, u32 *supported) |
| 671 | { |
| 672 | struct accessmap *map; |
| 673 | struct svc_export *export; |
| 674 | struct dentry *dentry; |
| 675 | u32 query, result = 0, sresult = 0; |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 676 | __be32 error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 677 | |
Miklos Szeredi | 8837abc | 2008-06-16 13:20:29 +0200 | [diff] [blame] | 678 | error = fh_verify(rqstp, fhp, 0, NFSD_MAY_NOP); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 679 | if (error) |
| 680 | goto out; |
| 681 | |
| 682 | export = fhp->fh_export; |
| 683 | dentry = fhp->fh_dentry; |
| 684 | |
| 685 | if (S_ISREG(dentry->d_inode->i_mode)) |
| 686 | map = nfs3_regaccess; |
| 687 | else if (S_ISDIR(dentry->d_inode->i_mode)) |
| 688 | map = nfs3_diraccess; |
| 689 | else |
| 690 | map = nfs3_anyaccess; |
| 691 | |
| 692 | |
| 693 | query = *access; |
| 694 | for (; map->access; map++) { |
| 695 | if (map->access & query) { |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 696 | __be32 err2; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 697 | |
| 698 | sresult |= map->access; |
| 699 | |
J. Bruce Fields | 0ec757d | 2007-07-17 04:04:48 -0700 | [diff] [blame] | 700 | err2 = nfsd_permission(rqstp, export, dentry, map->how); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 701 | switch (err2) { |
| 702 | case nfs_ok: |
| 703 | result |= map->access; |
| 704 | break; |
| 705 | |
| 706 | /* the following error codes just mean the access was not allowed, |
| 707 | * rather than an error occurred */ |
| 708 | case nfserr_rofs: |
| 709 | case nfserr_acces: |
| 710 | case nfserr_perm: |
| 711 | /* simply don't "or" in the access bit. */ |
| 712 | break; |
| 713 | default: |
| 714 | error = err2; |
| 715 | goto out; |
| 716 | } |
| 717 | } |
| 718 | } |
| 719 | *access = result; |
| 720 | if (supported) |
| 721 | *supported = sresult; |
| 722 | |
| 723 | out: |
| 724 | return error; |
| 725 | } |
| 726 | #endif /* CONFIG_NFSD_V3 */ |
| 727 | |
J. Bruce Fields | 105f462 | 2011-06-07 11:50:23 -0400 | [diff] [blame] | 728 | static int nfsd_open_break_lease(struct inode *inode, int access) |
| 729 | { |
| 730 | unsigned int mode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 731 | |
J. Bruce Fields | 105f462 | 2011-06-07 11:50:23 -0400 | [diff] [blame] | 732 | if (access & NFSD_MAY_NOT_BREAK_LEASE) |
| 733 | return 0; |
| 734 | mode = (access & NFSD_MAY_WRITE) ? O_WRONLY : O_RDONLY; |
| 735 | return break_lease(inode, mode | O_NONBLOCK); |
| 736 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 737 | |
| 738 | /* |
| 739 | * Open an existing file or directory. |
Bernd Schubert | 999448a | 2012-03-18 22:44:49 -0400 | [diff] [blame] | 740 | * The may_flags argument indicates the type of open (read/write/lock) |
| 741 | * and additional flags. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 742 | * N.B. After this call fhp needs an fh_put |
| 743 | */ |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 744 | __be32 |
Al Viro | 175a4eb | 2011-07-26 03:30:54 -0400 | [diff] [blame] | 745 | nfsd_open(struct svc_rqst *rqstp, struct svc_fh *fhp, umode_t type, |
Bernd Schubert | 999448a | 2012-03-18 22:44:49 -0400 | [diff] [blame] | 746 | int may_flags, struct file **filp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 747 | { |
| 748 | struct dentry *dentry; |
| 749 | struct inode *inode; |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 750 | int flags = O_RDONLY|O_LARGEFILE; |
| 751 | __be32 err; |
Jeff Layton | 9188525 | 2010-03-19 08:06:28 -0400 | [diff] [blame] | 752 | int host_err = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 753 | |
David Howells | e0e8173 | 2009-09-02 09:13:40 +0100 | [diff] [blame] | 754 | validate_process_creds(); |
| 755 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 756 | /* |
| 757 | * If we get here, then the client has already done an "open", |
| 758 | * and (hopefully) checked permission - so allow OWNER_OVERRIDE |
| 759 | * in case a chmod has now revoked permission. |
| 760 | */ |
Bernd Schubert | 999448a | 2012-03-18 22:44:49 -0400 | [diff] [blame] | 761 | err = fh_verify(rqstp, fhp, type, may_flags | NFSD_MAY_OWNER_OVERRIDE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 762 | if (err) |
| 763 | goto out; |
| 764 | |
| 765 | dentry = fhp->fh_dentry; |
| 766 | inode = dentry->d_inode; |
| 767 | |
| 768 | /* Disallow write access to files with the append-only bit set |
| 769 | * or any access when mandatory locking enabled |
| 770 | */ |
| 771 | err = nfserr_perm; |
Bernd Schubert | 999448a | 2012-03-18 22:44:49 -0400 | [diff] [blame] | 772 | if (IS_APPEND(inode) && (may_flags & NFSD_MAY_WRITE)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 773 | goto out; |
J. Bruce Fields | 5e7fc43 | 2007-10-02 14:18:12 -0400 | [diff] [blame] | 774 | /* |
| 775 | * We must ignore files (but only files) which might have mandatory |
| 776 | * locks on them because there is no way to know if the accesser has |
| 777 | * the lock. |
| 778 | */ |
| 779 | if (S_ISREG((inode)->i_mode) && mandatory_lock(inode)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 780 | goto out; |
| 781 | |
| 782 | if (!inode->i_fop) |
| 783 | goto out; |
| 784 | |
Bernd Schubert | 999448a | 2012-03-18 22:44:49 -0400 | [diff] [blame] | 785 | host_err = nfsd_open_break_lease(inode, may_flags); |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 786 | if (host_err) /* NOMEM or WOULDBLOCK */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 787 | goto out_nfserr; |
| 788 | |
Bernd Schubert | 999448a | 2012-03-18 22:44:49 -0400 | [diff] [blame] | 789 | if (may_flags & NFSD_MAY_WRITE) { |
| 790 | if (may_flags & NFSD_MAY_READ) |
J. Bruce Fields | 9ecb6a0 | 2006-06-30 01:56:17 -0700 | [diff] [blame] | 791 | flags = O_RDWR|O_LARGEFILE; |
| 792 | else |
| 793 | flags = O_WRONLY|O_LARGEFILE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 794 | } |
Jan Blunck | 5477549 | 2008-02-14 19:38:39 -0800 | [diff] [blame] | 795 | *filp = dentry_open(dget(dentry), mntget(fhp->fh_export->ex_path.mnt), |
David Howells | 033a666 | 2009-07-02 14:35:32 +0100 | [diff] [blame] | 796 | flags, current_cred()); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 797 | if (IS_ERR(*filp)) |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 798 | host_err = PTR_ERR(*filp); |
Bernd Schubert | 06effdb | 2012-03-18 22:44:50 -0400 | [diff] [blame] | 799 | else { |
Bernd Schubert | 999448a | 2012-03-18 22:44:49 -0400 | [diff] [blame] | 800 | host_err = ima_file_check(*filp, may_flags); |
| 801 | |
Bernd Schubert | 06effdb | 2012-03-18 22:44:50 -0400 | [diff] [blame] | 802 | if (may_flags & NFSD_MAY_64BIT_COOKIE) |
| 803 | (*filp)->f_mode |= FMODE_64BITHASH; |
| 804 | else |
| 805 | (*filp)->f_mode |= FMODE_32BITHASH; |
| 806 | } |
| 807 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 808 | out_nfserr: |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 809 | err = nfserrno(host_err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 810 | out: |
David Howells | e0e8173 | 2009-09-02 09:13:40 +0100 | [diff] [blame] | 811 | validate_process_creds(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 812 | return err; |
| 813 | } |
| 814 | |
| 815 | /* |
| 816 | * Close a file. |
| 817 | */ |
| 818 | void |
| 819 | nfsd_close(struct file *filp) |
| 820 | { |
| 821 | fput(filp); |
| 822 | } |
| 823 | |
J. Bruce Fields | 9a8d248 | 2009-01-06 13:37:03 -0500 | [diff] [blame] | 824 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 825 | * Obtain the readahead parameters for the file |
| 826 | * specified by (dev, ino). |
| 827 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 828 | |
| 829 | static inline struct raparms * |
| 830 | nfsd_get_raparms(dev_t dev, ino_t ino) |
| 831 | { |
| 832 | struct raparms *ra, **rap, **frap = NULL; |
| 833 | int depth = 0; |
Greg Banks | fce1456 | 2006-10-04 02:15:49 -0700 | [diff] [blame] | 834 | unsigned int hash; |
| 835 | struct raparm_hbucket *rab; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 836 | |
Greg Banks | fce1456 | 2006-10-04 02:15:49 -0700 | [diff] [blame] | 837 | hash = jhash_2words(dev, ino, 0xfeedbeef) & RAPARM_HASH_MASK; |
| 838 | rab = &raparm_hash[hash]; |
| 839 | |
| 840 | spin_lock(&rab->pb_lock); |
| 841 | for (rap = &rab->pb_head; (ra = *rap); rap = &ra->p_next) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 842 | if (ra->p_ino == ino && ra->p_dev == dev) |
| 843 | goto found; |
| 844 | depth++; |
| 845 | if (ra->p_count == 0) |
| 846 | frap = rap; |
| 847 | } |
Konstantin Khorenko | 3aa6e0a | 2011-02-01 17:16:29 +0300 | [diff] [blame] | 848 | depth = nfsdstats.ra_size; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 849 | if (!frap) { |
Greg Banks | fce1456 | 2006-10-04 02:15:49 -0700 | [diff] [blame] | 850 | spin_unlock(&rab->pb_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 851 | return NULL; |
| 852 | } |
| 853 | rap = frap; |
| 854 | ra = *frap; |
| 855 | ra->p_dev = dev; |
| 856 | ra->p_ino = ino; |
| 857 | ra->p_set = 0; |
Greg Banks | fce1456 | 2006-10-04 02:15:49 -0700 | [diff] [blame] | 858 | ra->p_hindex = hash; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 859 | found: |
Greg Banks | fce1456 | 2006-10-04 02:15:49 -0700 | [diff] [blame] | 860 | if (rap != &rab->pb_head) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 861 | *rap = ra->p_next; |
Greg Banks | fce1456 | 2006-10-04 02:15:49 -0700 | [diff] [blame] | 862 | ra->p_next = rab->pb_head; |
| 863 | rab->pb_head = ra; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 864 | } |
| 865 | ra->p_count++; |
| 866 | nfsdstats.ra_depth[depth*10/nfsdstats.ra_size]++; |
Greg Banks | fce1456 | 2006-10-04 02:15:49 -0700 | [diff] [blame] | 867 | spin_unlock(&rab->pb_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 868 | return ra; |
| 869 | } |
| 870 | |
| 871 | /* |
Jens Axboe | cf8208d | 2007-06-12 21:22:14 +0200 | [diff] [blame] | 872 | * Grab and keep cached pages associated with a file in the svc_rqst |
| 873 | * so that they can be passed to the network sendmsg/sendpage routines |
| 874 | * directly. They will be released after the sending has completed. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 875 | */ |
| 876 | static int |
Jens Axboe | cf8208d | 2007-06-12 21:22:14 +0200 | [diff] [blame] | 877 | nfsd_splice_actor(struct pipe_inode_info *pipe, struct pipe_buffer *buf, |
| 878 | struct splice_desc *sd) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 879 | { |
Jens Axboe | cf8208d | 2007-06-12 21:22:14 +0200 | [diff] [blame] | 880 | struct svc_rqst *rqstp = sd->u.data; |
NeilBrown | 4452435 | 2006-10-04 02:15:46 -0700 | [diff] [blame] | 881 | struct page **pp = rqstp->rq_respages + rqstp->rq_resused; |
Jens Axboe | cf8208d | 2007-06-12 21:22:14 +0200 | [diff] [blame] | 882 | struct page *page = buf->page; |
| 883 | size_t size; |
Jens Axboe | cf8208d | 2007-06-12 21:22:14 +0200 | [diff] [blame] | 884 | |
| 885 | size = sd->len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 886 | |
| 887 | if (rqstp->rq_res.page_len == 0) { |
| 888 | get_page(page); |
NeilBrown | 4452435 | 2006-10-04 02:15:46 -0700 | [diff] [blame] | 889 | put_page(*pp); |
| 890 | *pp = page; |
| 891 | rqstp->rq_resused++; |
Jens Axboe | cf8208d | 2007-06-12 21:22:14 +0200 | [diff] [blame] | 892 | rqstp->rq_res.page_base = buf->offset; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 893 | rqstp->rq_res.page_len = size; |
NeilBrown | 4452435 | 2006-10-04 02:15:46 -0700 | [diff] [blame] | 894 | } else if (page != pp[-1]) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 895 | get_page(page); |
NeilBrown | 250f391 | 2007-01-26 00:56:59 -0800 | [diff] [blame] | 896 | if (*pp) |
| 897 | put_page(*pp); |
NeilBrown | 4452435 | 2006-10-04 02:15:46 -0700 | [diff] [blame] | 898 | *pp = page; |
| 899 | rqstp->rq_resused++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 900 | rqstp->rq_res.page_len += size; |
NeilBrown | 4452435 | 2006-10-04 02:15:46 -0700 | [diff] [blame] | 901 | } else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 902 | rqstp->rq_res.page_len += size; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 903 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 904 | return size; |
| 905 | } |
| 906 | |
Jens Axboe | cf8208d | 2007-06-12 21:22:14 +0200 | [diff] [blame] | 907 | static int nfsd_direct_splice_actor(struct pipe_inode_info *pipe, |
| 908 | struct splice_desc *sd) |
| 909 | { |
| 910 | return __splice_from_pipe(pipe, sd, nfsd_splice_actor); |
| 911 | } |
| 912 | |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 913 | static __be32 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 914 | nfsd_vfs_read(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file, |
| 915 | loff_t offset, struct kvec *vec, int vlen, unsigned long *count) |
| 916 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 917 | mm_segment_t oldfs; |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 918 | __be32 err; |
| 919 | int host_err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 920 | |
| 921 | err = nfserr_perm; |
Dave Hansen | a8754be | 2007-10-16 23:31:15 -0700 | [diff] [blame] | 922 | |
Jens Axboe | cf8208d | 2007-06-12 21:22:14 +0200 | [diff] [blame] | 923 | if (file->f_op->splice_read && rqstp->rq_splice_ok) { |
| 924 | struct splice_desc sd = { |
| 925 | .len = 0, |
| 926 | .total_len = *count, |
| 927 | .pos = offset, |
| 928 | .u.data = rqstp, |
| 929 | }; |
| 930 | |
Jens Axboe | 4fbef20 | 2007-07-13 22:42:20 +0200 | [diff] [blame] | 931 | rqstp->rq_resused = 1; |
Jens Axboe | cf8208d | 2007-06-12 21:22:14 +0200 | [diff] [blame] | 932 | host_err = splice_direct_to_actor(file, &sd, nfsd_direct_splice_actor); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 933 | } else { |
| 934 | oldfs = get_fs(); |
| 935 | set_fs(KERNEL_DS); |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 936 | host_err = vfs_readv(file, (struct iovec __user *)vec, vlen, &offset); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 937 | set_fs(oldfs); |
| 938 | } |
| 939 | |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 940 | if (host_err >= 0) { |
| 941 | nfsdstats.io_read += host_err; |
| 942 | *count = host_err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 943 | err = 0; |
Eric Paris | 2a12a9d | 2009-12-17 21:24:21 -0500 | [diff] [blame] | 944 | fsnotify_access(file); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 945 | } else |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 946 | err = nfserrno(host_err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 947 | return err; |
| 948 | } |
| 949 | |
Neil Brown | 9f708e4 | 2006-01-06 00:19:59 -0800 | [diff] [blame] | 950 | static void kill_suid(struct dentry *dentry) |
| 951 | { |
| 952 | struct iattr ia; |
Serge E. Hallyn | b537677 | 2007-10-16 23:31:36 -0700 | [diff] [blame] | 953 | ia.ia_valid = ATTR_KILL_SUID | ATTR_KILL_SGID | ATTR_KILL_PRIV; |
Neil Brown | 9f708e4 | 2006-01-06 00:19:59 -0800 | [diff] [blame] | 954 | |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 955 | mutex_lock(&dentry->d_inode->i_mutex); |
Neil Brown | 9f708e4 | 2006-01-06 00:19:59 -0800 | [diff] [blame] | 956 | notify_change(dentry, &ia); |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 957 | mutex_unlock(&dentry->d_inode->i_mutex); |
Neil Brown | 9f708e4 | 2006-01-06 00:19:59 -0800 | [diff] [blame] | 958 | } |
| 959 | |
J. Bruce Fields | d911df7 | 2009-06-15 16:03:53 -0700 | [diff] [blame] | 960 | /* |
| 961 | * Gathered writes: If another process is currently writing to the file, |
| 962 | * there's a high chance this is another nfsd (triggered by a bulk write |
| 963 | * from a client's biod). Rather than syncing the file with each write |
| 964 | * request, we sleep for 10 msec. |
| 965 | * |
| 966 | * I don't know if this roughly approximates C. Juszak's idea of |
| 967 | * gathered writes, but it's a nice and simple solution (IMHO), and it |
| 968 | * seems to work:-) |
| 969 | * |
| 970 | * Note: we do this only in the NFSv2 case, since v3 and higher have a |
| 971 | * better tool (separate unstable writes and commits) for solving this |
| 972 | * problem. |
| 973 | */ |
| 974 | static int wait_for_concurrent_writes(struct file *file) |
| 975 | { |
| 976 | struct inode *inode = file->f_path.dentry->d_inode; |
| 977 | static ino_t last_ino; |
| 978 | static dev_t last_dev; |
| 979 | int err = 0; |
| 980 | |
| 981 | if (atomic_read(&inode->i_writecount) > 1 |
| 982 | || (last_ino == inode->i_ino && last_dev == inode->i_sb->s_dev)) { |
| 983 | dprintk("nfsd: write defer %d\n", task_pid_nr(current)); |
| 984 | msleep(10); |
| 985 | dprintk("nfsd: write resume %d\n", task_pid_nr(current)); |
| 986 | } |
| 987 | |
| 988 | if (inode->i_state & I_DIRTY) { |
| 989 | dprintk("nfsd: write sync %d\n", task_pid_nr(current)); |
Christoph Hellwig | 8018ab0 | 2010-03-22 17:32:25 +0100 | [diff] [blame] | 990 | err = vfs_fsync(file, 0); |
J. Bruce Fields | d911df7 | 2009-06-15 16:03:53 -0700 | [diff] [blame] | 991 | } |
| 992 | last_ino = inode->i_ino; |
| 993 | last_dev = inode->i_sb->s_dev; |
| 994 | return err; |
| 995 | } |
| 996 | |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 997 | static __be32 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 998 | nfsd_vfs_write(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file, |
| 999 | loff_t offset, struct kvec *vec, int vlen, |
David Shaw | 31dec25 | 2009-03-05 20:16:14 -0500 | [diff] [blame] | 1000 | unsigned long *cnt, int *stablep) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1001 | { |
| 1002 | struct svc_export *exp; |
| 1003 | struct dentry *dentry; |
| 1004 | struct inode *inode; |
| 1005 | mm_segment_t oldfs; |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1006 | __be32 err = 0; |
| 1007 | int host_err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1008 | int stable = *stablep; |
Trond Myklebust | 48e03bc | 2009-06-05 12:35:15 -0400 | [diff] [blame] | 1009 | int use_wgather; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1010 | |
Josef "Jeff" Sipek | 7eaa36e | 2006-12-08 02:36:41 -0800 | [diff] [blame] | 1011 | dentry = file->f_path.dentry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1012 | inode = dentry->d_inode; |
| 1013 | exp = fhp->fh_export; |
| 1014 | |
| 1015 | /* |
| 1016 | * Request sync writes if |
| 1017 | * - the sync export option has been set, or |
| 1018 | * - the client requested O_SYNC behavior (NFSv3 feature). |
| 1019 | * - The file system doesn't support fsync(). |
Trond Myklebust | 48e03bc | 2009-06-05 12:35:15 -0400 | [diff] [blame] | 1020 | * When NFSv2 gathered writes have been configured for this volume, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1021 | * flushing the data to disk is handled separately below. |
| 1022 | */ |
Trond Myklebust | 48e03bc | 2009-06-05 12:35:15 -0400 | [diff] [blame] | 1023 | use_wgather = (rqstp->rq_vers == 2) && EX_WGATHER(exp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1024 | |
Harvey Harrison | 3ba1514 | 2008-02-20 12:49:02 -0800 | [diff] [blame] | 1025 | if (!file->f_op->fsync) {/* COMMIT3 cannot work */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1026 | stable = 2; |
| 1027 | *stablep = 2; /* FILE_SYNC */ |
| 1028 | } |
| 1029 | |
| 1030 | if (!EX_ISSYNC(exp)) |
| 1031 | stable = 0; |
Trond Myklebust | 48e03bc | 2009-06-05 12:35:15 -0400 | [diff] [blame] | 1032 | if (stable && !use_wgather) { |
Jonathan Corbet | db1dd4d | 2009-02-06 15:25:24 -0700 | [diff] [blame] | 1033 | spin_lock(&file->f_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1034 | file->f_flags |= O_SYNC; |
Jonathan Corbet | db1dd4d | 2009-02-06 15:25:24 -0700 | [diff] [blame] | 1035 | spin_unlock(&file->f_lock); |
| 1036 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1037 | |
| 1038 | /* Write the data. */ |
| 1039 | oldfs = get_fs(); set_fs(KERNEL_DS); |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1040 | host_err = vfs_writev(file, (struct iovec __user *)vec, vlen, &offset); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1041 | set_fs(oldfs); |
J. Bruce Fields | e4636d5 | 2009-06-15 19:07:13 -0700 | [diff] [blame] | 1042 | if (host_err < 0) |
| 1043 | goto out_nfserr; |
| 1044 | *cnt = host_err; |
| 1045 | nfsdstats.io_write += host_err; |
Eric Paris | 2a12a9d | 2009-12-17 21:24:21 -0500 | [diff] [blame] | 1046 | fsnotify_modify(file); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1047 | |
| 1048 | /* clear setuid/setgid flag after write */ |
J. Bruce Fields | e4636d5 | 2009-06-15 19:07:13 -0700 | [diff] [blame] | 1049 | if (inode->i_mode & (S_ISUID | S_ISGID)) |
Neil Brown | 9f708e4 | 2006-01-06 00:19:59 -0800 | [diff] [blame] | 1050 | kill_suid(dentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1051 | |
J. Bruce Fields | e4636d5 | 2009-06-15 19:07:13 -0700 | [diff] [blame] | 1052 | if (stable && use_wgather) |
J. Bruce Fields | d911df7 | 2009-06-15 16:03:53 -0700 | [diff] [blame] | 1053 | host_err = wait_for_concurrent_writes(file); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1054 | |
J. Bruce Fields | e4636d5 | 2009-06-15 19:07:13 -0700 | [diff] [blame] | 1055 | out_nfserr: |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1056 | dprintk("nfsd: write complete host_err=%d\n", host_err); |
Wei Yongjun | a0d24b2 | 2009-05-19 12:03:15 +0800 | [diff] [blame] | 1057 | if (host_err >= 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1058 | err = 0; |
Wei Yongjun | a0d24b2 | 2009-05-19 12:03:15 +0800 | [diff] [blame] | 1059 | else |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1060 | err = nfserrno(host_err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1061 | return err; |
| 1062 | } |
| 1063 | |
| 1064 | /* |
| 1065 | * Read data from a file. count must contain the requested read count |
| 1066 | * on entry. On return, *count contains the number of bytes actually read. |
| 1067 | * N.B. After this call fhp needs an fh_put |
| 1068 | */ |
J. Bruce Fields | 039a87c | 2010-07-30 11:33:32 -0400 | [diff] [blame] | 1069 | __be32 nfsd_read(struct svc_rqst *rqstp, struct svc_fh *fhp, |
J. Bruce Fields | fa0a212 | 2010-07-27 16:48:54 -0400 | [diff] [blame] | 1070 | loff_t offset, struct kvec *vec, int vlen, unsigned long *count) |
| 1071 | { |
| 1072 | struct file *file; |
| 1073 | struct inode *inode; |
| 1074 | struct raparms *ra; |
| 1075 | __be32 err; |
| 1076 | |
| 1077 | err = nfsd_open(rqstp, fhp, S_IFREG, NFSD_MAY_READ, &file); |
| 1078 | if (err) |
| 1079 | return err; |
| 1080 | |
| 1081 | inode = file->f_path.dentry->d_inode; |
| 1082 | |
| 1083 | /* Get readahead parameters */ |
| 1084 | ra = nfsd_get_raparms(inode->i_sb->s_dev, inode->i_ino); |
| 1085 | |
| 1086 | if (ra && ra->p_set) |
| 1087 | file->f_ra = ra->p_ra; |
| 1088 | |
| 1089 | err = nfsd_vfs_read(rqstp, fhp, file, offset, vec, vlen, count); |
| 1090 | |
| 1091 | /* Write back readahead params */ |
| 1092 | if (ra) { |
| 1093 | struct raparm_hbucket *rab = &raparm_hash[ra->p_hindex]; |
| 1094 | spin_lock(&rab->pb_lock); |
| 1095 | ra->p_ra = file->f_ra; |
| 1096 | ra->p_set = 1; |
| 1097 | ra->p_count--; |
| 1098 | spin_unlock(&rab->pb_lock); |
| 1099 | } |
| 1100 | |
| 1101 | nfsd_close(file); |
| 1102 | return err; |
| 1103 | } |
| 1104 | |
J. Bruce Fields | 039a87c | 2010-07-30 11:33:32 -0400 | [diff] [blame] | 1105 | /* As above, but use the provided file descriptor. */ |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1106 | __be32 |
J. Bruce Fields | 039a87c | 2010-07-30 11:33:32 -0400 | [diff] [blame] | 1107 | nfsd_read_file(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1108 | loff_t offset, struct kvec *vec, int vlen, |
| 1109 | unsigned long *count) |
| 1110 | { |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1111 | __be32 err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1112 | |
| 1113 | if (file) { |
J. Bruce Fields | 0ec757d | 2007-07-17 04:04:48 -0700 | [diff] [blame] | 1114 | err = nfsd_permission(rqstp, fhp->fh_export, fhp->fh_dentry, |
Miklos Szeredi | 8837abc | 2008-06-16 13:20:29 +0200 | [diff] [blame] | 1115 | NFSD_MAY_READ|NFSD_MAY_OWNER_OVERRIDE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1116 | if (err) |
| 1117 | goto out; |
| 1118 | err = nfsd_vfs_read(rqstp, fhp, file, offset, vec, vlen, count); |
J. Bruce Fields | 039a87c | 2010-07-30 11:33:32 -0400 | [diff] [blame] | 1119 | } else /* Note file may still be NULL in NFSv4 special stateid case: */ |
| 1120 | err = nfsd_read(rqstp, fhp, offset, vec, vlen, count); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1121 | out: |
| 1122 | return err; |
| 1123 | } |
| 1124 | |
| 1125 | /* |
| 1126 | * Write data to a file. |
| 1127 | * The stable flag requests synchronous writes. |
| 1128 | * N.B. After this call fhp needs an fh_put |
| 1129 | */ |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1130 | __be32 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1131 | nfsd_write(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file, |
David Shaw | 31dec25 | 2009-03-05 20:16:14 -0500 | [diff] [blame] | 1132 | loff_t offset, struct kvec *vec, int vlen, unsigned long *cnt, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1133 | int *stablep) |
| 1134 | { |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1135 | __be32 err = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1136 | |
| 1137 | if (file) { |
J. Bruce Fields | 0ec757d | 2007-07-17 04:04:48 -0700 | [diff] [blame] | 1138 | err = nfsd_permission(rqstp, fhp->fh_export, fhp->fh_dentry, |
Miklos Szeredi | 8837abc | 2008-06-16 13:20:29 +0200 | [diff] [blame] | 1139 | NFSD_MAY_WRITE|NFSD_MAY_OWNER_OVERRIDE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1140 | if (err) |
| 1141 | goto out; |
| 1142 | err = nfsd_vfs_write(rqstp, fhp, file, offset, vec, vlen, cnt, |
| 1143 | stablep); |
| 1144 | } else { |
Miklos Szeredi | 8837abc | 2008-06-16 13:20:29 +0200 | [diff] [blame] | 1145 | err = nfsd_open(rqstp, fhp, S_IFREG, NFSD_MAY_WRITE, &file); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1146 | if (err) |
| 1147 | goto out; |
| 1148 | |
| 1149 | if (cnt) |
| 1150 | err = nfsd_vfs_write(rqstp, fhp, file, offset, vec, vlen, |
| 1151 | cnt, stablep); |
| 1152 | nfsd_close(file); |
| 1153 | } |
| 1154 | out: |
| 1155 | return err; |
| 1156 | } |
| 1157 | |
| 1158 | #ifdef CONFIG_NFSD_V3 |
| 1159 | /* |
| 1160 | * Commit all pending writes to stable storage. |
Trond Myklebust | aa696a6 | 2010-01-29 16:44:25 -0500 | [diff] [blame] | 1161 | * |
| 1162 | * Note: we only guarantee that data that lies within the range specified |
| 1163 | * by the 'offset' and 'count' parameters will be synced. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1164 | * |
| 1165 | * Unfortunately we cannot lock the file to make sure we return full WCC |
| 1166 | * data to the client, as locking happens lower down in the filesystem. |
| 1167 | */ |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1168 | __be32 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1169 | nfsd_commit(struct svc_rqst *rqstp, struct svc_fh *fhp, |
| 1170 | loff_t offset, unsigned long count) |
| 1171 | { |
| 1172 | struct file *file; |
Trond Myklebust | aa696a6 | 2010-01-29 16:44:25 -0500 | [diff] [blame] | 1173 | loff_t end = LLONG_MAX; |
| 1174 | __be32 err = nfserr_inval; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1175 | |
Trond Myklebust | aa696a6 | 2010-01-29 16:44:25 -0500 | [diff] [blame] | 1176 | if (offset < 0) |
| 1177 | goto out; |
| 1178 | if (count != 0) { |
| 1179 | end = offset + (loff_t)count - 1; |
| 1180 | if (end < offset) |
| 1181 | goto out; |
| 1182 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1183 | |
Jeff Layton | 9188525 | 2010-03-19 08:06:28 -0400 | [diff] [blame] | 1184 | err = nfsd_open(rqstp, fhp, S_IFREG, |
| 1185 | NFSD_MAY_WRITE|NFSD_MAY_NOT_BREAK_LEASE, &file); |
Miklos Szeredi | 8837abc | 2008-06-16 13:20:29 +0200 | [diff] [blame] | 1186 | if (err) |
Trond Myklebust | aa696a6 | 2010-01-29 16:44:25 -0500 | [diff] [blame] | 1187 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1188 | if (EX_ISSYNC(fhp->fh_export)) { |
Christoph Hellwig | 8018ab0 | 2010-03-22 17:32:25 +0100 | [diff] [blame] | 1189 | int err2 = vfs_fsync_range(file, offset, end, 0); |
Trond Myklebust | aa696a6 | 2010-01-29 16:44:25 -0500 | [diff] [blame] | 1190 | |
| 1191 | if (err2 != -EINVAL) |
| 1192 | err = nfserrno(err2); |
| 1193 | else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1194 | err = nfserr_notsupp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1195 | } |
| 1196 | |
| 1197 | nfsd_close(file); |
Trond Myklebust | aa696a6 | 2010-01-29 16:44:25 -0500 | [diff] [blame] | 1198 | out: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1199 | return err; |
| 1200 | } |
| 1201 | #endif /* CONFIG_NFSD_V3 */ |
| 1202 | |
Adrian Bunk | f2b0dee | 2008-02-13 23:30:26 +0200 | [diff] [blame] | 1203 | static __be32 |
J. Bruce Fields | 5c002b3 | 2007-11-30 16:55:23 -0500 | [diff] [blame] | 1204 | nfsd_create_setattr(struct svc_rqst *rqstp, struct svc_fh *resfhp, |
| 1205 | struct iattr *iap) |
| 1206 | { |
| 1207 | /* |
| 1208 | * Mode has already been set earlier in create: |
| 1209 | */ |
| 1210 | iap->ia_valid &= ~ATTR_MODE; |
| 1211 | /* |
| 1212 | * Setting uid/gid works only for root. Irix appears to |
| 1213 | * send along the gid on create when it tries to implement |
| 1214 | * setgid directories via NFS: |
| 1215 | */ |
David Howells | 5cc0a84 | 2008-11-14 10:38:58 +1100 | [diff] [blame] | 1216 | if (current_fsuid() != 0) |
J. Bruce Fields | 5c002b3 | 2007-11-30 16:55:23 -0500 | [diff] [blame] | 1217 | iap->ia_valid &= ~(ATTR_UID|ATTR_GID); |
| 1218 | if (iap->ia_valid) |
| 1219 | return nfsd_setattr(rqstp, resfhp, iap, 0, (time_t)0); |
| 1220 | return 0; |
| 1221 | } |
| 1222 | |
wengang wang | 4ac35c2 | 2009-02-10 11:27:51 +0800 | [diff] [blame] | 1223 | /* HPUX client sometimes creates a file in mode 000, and sets size to 0. |
| 1224 | * setting size to 0 may fail for some specific file systems by the permission |
| 1225 | * checking which requires WRITE permission but the mode is 000. |
| 1226 | * we ignore the resizing(to 0) on the just new created file, since the size is |
| 1227 | * 0 after file created. |
| 1228 | * |
| 1229 | * call this only after vfs_create() is called. |
| 1230 | * */ |
| 1231 | static void |
| 1232 | nfsd_check_ignore_resizing(struct iattr *iap) |
| 1233 | { |
| 1234 | if ((iap->ia_valid & ATTR_SIZE) && (iap->ia_size == 0)) |
| 1235 | iap->ia_valid &= ~ATTR_SIZE; |
| 1236 | } |
| 1237 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1238 | /* |
| 1239 | * Create a file (regular, directory, device, fifo); UNIX sockets |
| 1240 | * not yet implemented. |
| 1241 | * If the response fh has been verified, the parent directory should |
| 1242 | * already be locked. Note that the parent directory is left locked. |
| 1243 | * |
| 1244 | * N.B. Every call to nfsd_create needs an fh_put for _both_ fhp and resfhp |
| 1245 | */ |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1246 | __be32 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1247 | nfsd_create(struct svc_rqst *rqstp, struct svc_fh *fhp, |
| 1248 | char *fname, int flen, struct iattr *iap, |
| 1249 | int type, dev_t rdev, struct svc_fh *resfhp) |
| 1250 | { |
| 1251 | struct dentry *dentry, *dchild = NULL; |
| 1252 | struct inode *dirp; |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1253 | __be32 err; |
J. Bruce Fields | 5c002b3 | 2007-11-30 16:55:23 -0500 | [diff] [blame] | 1254 | __be32 err2; |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1255 | int host_err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1256 | |
| 1257 | err = nfserr_perm; |
| 1258 | if (!flen) |
| 1259 | goto out; |
| 1260 | err = nfserr_exist; |
| 1261 | if (isdotent(fname, flen)) |
| 1262 | goto out; |
| 1263 | |
Miklos Szeredi | 8837abc | 2008-06-16 13:20:29 +0200 | [diff] [blame] | 1264 | err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_CREATE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1265 | if (err) |
| 1266 | goto out; |
| 1267 | |
| 1268 | dentry = fhp->fh_dentry; |
| 1269 | dirp = dentry->d_inode; |
| 1270 | |
| 1271 | err = nfserr_notdir; |
Al Viro | acfa438 | 2008-12-04 10:06:33 -0500 | [diff] [blame] | 1272 | if (!dirp->i_op->lookup) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1273 | goto out; |
| 1274 | /* |
| 1275 | * Check whether the response file handle has been verified yet. |
| 1276 | * If it has, the parent directory should already be locked. |
| 1277 | */ |
| 1278 | if (!resfhp->fh_dentry) { |
| 1279 | /* called from nfsd_proc_mkdir, or possibly nfsd3_proc_create */ |
Peter Zijlstra | 12fd352 | 2006-10-02 02:18:03 -0700 | [diff] [blame] | 1280 | fh_lock_nested(fhp, I_MUTEX_PARENT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1281 | dchild = lookup_one_len(fname, dentry, flen); |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1282 | host_err = PTR_ERR(dchild); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1283 | if (IS_ERR(dchild)) |
| 1284 | goto out_nfserr; |
| 1285 | err = fh_compose(resfhp, fhp->fh_export, dchild, fhp); |
| 1286 | if (err) |
| 1287 | goto out; |
| 1288 | } else { |
| 1289 | /* called from nfsd_proc_create */ |
| 1290 | dchild = dget(resfhp->fh_dentry); |
| 1291 | if (!fhp->fh_locked) { |
| 1292 | /* not actually possible */ |
| 1293 | printk(KERN_ERR |
| 1294 | "nfsd_create: parent %s/%s not locked!\n", |
| 1295 | dentry->d_parent->d_name.name, |
| 1296 | dentry->d_name.name); |
Al Viro | d75f2b9 | 2006-01-18 17:43:44 -0800 | [diff] [blame] | 1297 | err = nfserr_io; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1298 | goto out; |
| 1299 | } |
| 1300 | } |
| 1301 | /* |
| 1302 | * Make sure the child dentry is still negative ... |
| 1303 | */ |
| 1304 | err = nfserr_exist; |
| 1305 | if (dchild->d_inode) { |
| 1306 | dprintk("nfsd_create: dentry %s/%s not negative!\n", |
| 1307 | dentry->d_name.name, dchild->d_name.name); |
| 1308 | goto out; |
| 1309 | } |
| 1310 | |
| 1311 | if (!(iap->ia_valid & ATTR_MODE)) |
| 1312 | iap->ia_mode = 0; |
| 1313 | iap->ia_mode = (iap->ia_mode & S_IALLUGO) | type; |
| 1314 | |
Miklos Szeredi | 07cad1d | 2008-07-01 15:38:35 +0200 | [diff] [blame] | 1315 | err = nfserr_inval; |
| 1316 | if (!S_ISREG(type) && !S_ISDIR(type) && !special_file(type)) { |
| 1317 | printk(KERN_WARNING "nfsd: bad file type %o in nfsd_create\n", |
| 1318 | type); |
| 1319 | goto out; |
| 1320 | } |
| 1321 | |
Al Viro | bad0dcf | 2011-11-23 12:03:18 -0500 | [diff] [blame] | 1322 | host_err = fh_want_write(fhp); |
Miklos Szeredi | 07cad1d | 2008-07-01 15:38:35 +0200 | [diff] [blame] | 1323 | if (host_err) |
| 1324 | goto out_nfserr; |
| 1325 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1326 | /* |
| 1327 | * Get the dir op function pointer. |
| 1328 | */ |
J. Bruce Fields | 088406b | 2006-11-08 17:44:59 -0800 | [diff] [blame] | 1329 | err = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1330 | switch (type) { |
| 1331 | case S_IFREG: |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1332 | host_err = vfs_create(dirp, dchild, iap->ia_mode, NULL); |
wengang wang | 4ac35c2 | 2009-02-10 11:27:51 +0800 | [diff] [blame] | 1333 | if (!host_err) |
| 1334 | nfsd_check_ignore_resizing(iap); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1335 | break; |
| 1336 | case S_IFDIR: |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1337 | host_err = vfs_mkdir(dirp, dchild, iap->ia_mode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1338 | break; |
| 1339 | case S_IFCHR: |
| 1340 | case S_IFBLK: |
| 1341 | case S_IFIFO: |
| 1342 | case S_IFSOCK: |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1343 | host_err = vfs_mknod(dirp, dchild, iap->ia_mode, rdev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1344 | break; |
Dave Hansen | 463c319 | 2008-02-15 14:37:57 -0800 | [diff] [blame] | 1345 | } |
| 1346 | if (host_err < 0) { |
Al Viro | bad0dcf | 2011-11-23 12:03:18 -0500 | [diff] [blame] | 1347 | fh_drop_write(fhp); |
Dave Hansen | 463c319 | 2008-02-15 14:37:57 -0800 | [diff] [blame] | 1348 | goto out_nfserr; |
| 1349 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1350 | |
Ben Myers | f501912 | 2010-02-17 14:05:11 -0600 | [diff] [blame] | 1351 | err = nfsd_create_setattr(rqstp, resfhp, iap); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1352 | |
Ben Myers | f501912 | 2010-02-17 14:05:11 -0600 | [diff] [blame] | 1353 | /* |
| 1354 | * nfsd_setattr already committed the child. Transactional filesystems |
| 1355 | * had a chance to commit changes for both parent and child |
| 1356 | * simultaneously making the following commit_metadata a noop. |
| 1357 | */ |
| 1358 | err2 = nfserrno(commit_metadata(fhp)); |
J. Bruce Fields | 5c002b3 | 2007-11-30 16:55:23 -0500 | [diff] [blame] | 1359 | if (err2) |
| 1360 | err = err2; |
Al Viro | bad0dcf | 2011-11-23 12:03:18 -0500 | [diff] [blame] | 1361 | fh_drop_write(fhp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1362 | /* |
| 1363 | * Update the file handle to get the new inode info. |
| 1364 | */ |
| 1365 | if (!err) |
| 1366 | err = fh_update(resfhp); |
| 1367 | out: |
| 1368 | if (dchild && !IS_ERR(dchild)) |
| 1369 | dput(dchild); |
| 1370 | return err; |
| 1371 | |
| 1372 | out_nfserr: |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1373 | err = nfserrno(host_err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1374 | goto out; |
| 1375 | } |
| 1376 | |
| 1377 | #ifdef CONFIG_NFSD_V3 |
Mi Jinlong | ac6721a | 2011-04-20 17:06:25 +0800 | [diff] [blame] | 1378 | |
| 1379 | static inline int nfsd_create_is_exclusive(int createmode) |
| 1380 | { |
| 1381 | return createmode == NFS3_CREATE_EXCLUSIVE |
| 1382 | || createmode == NFS4_CREATE_EXCLUSIVE4_1; |
| 1383 | } |
| 1384 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1385 | /* |
Mi Jinlong | ac6721a | 2011-04-20 17:06:25 +0800 | [diff] [blame] | 1386 | * NFSv3 and NFSv4 version of nfsd_create |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1387 | */ |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1388 | __be32 |
Mi Jinlong | ac6721a | 2011-04-20 17:06:25 +0800 | [diff] [blame] | 1389 | do_nfsd_create(struct svc_rqst *rqstp, struct svc_fh *fhp, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1390 | char *fname, int flen, struct iattr *iap, |
| 1391 | struct svc_fh *resfhp, int createmode, u32 *verifier, |
J. Bruce Fields | 856121b | 2011-10-13 11:37:11 -0400 | [diff] [blame] | 1392 | bool *truncp, bool *created) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1393 | { |
| 1394 | struct dentry *dentry, *dchild = NULL; |
| 1395 | struct inode *dirp; |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1396 | __be32 err; |
| 1397 | int host_err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1398 | __u32 v_mtime=0, v_atime=0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1399 | |
| 1400 | err = nfserr_perm; |
| 1401 | if (!flen) |
| 1402 | goto out; |
| 1403 | err = nfserr_exist; |
| 1404 | if (isdotent(fname, flen)) |
| 1405 | goto out; |
| 1406 | if (!(iap->ia_valid & ATTR_MODE)) |
| 1407 | iap->ia_mode = 0; |
Sachin Prabhu | 1574dff | 2011-04-20 13:09:35 +0100 | [diff] [blame] | 1408 | err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_EXEC); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1409 | if (err) |
| 1410 | goto out; |
| 1411 | |
| 1412 | dentry = fhp->fh_dentry; |
| 1413 | dirp = dentry->d_inode; |
| 1414 | |
| 1415 | /* Get all the sanity checks out of the way before |
| 1416 | * we lock the parent. */ |
| 1417 | err = nfserr_notdir; |
Al Viro | acfa438 | 2008-12-04 10:06:33 -0500 | [diff] [blame] | 1418 | if (!dirp->i_op->lookup) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1419 | goto out; |
Peter Zijlstra | 12fd352 | 2006-10-02 02:18:03 -0700 | [diff] [blame] | 1420 | fh_lock_nested(fhp, I_MUTEX_PARENT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1421 | |
| 1422 | /* |
| 1423 | * Compose the response file handle. |
| 1424 | */ |
| 1425 | dchild = lookup_one_len(fname, dentry, flen); |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1426 | host_err = PTR_ERR(dchild); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1427 | if (IS_ERR(dchild)) |
| 1428 | goto out_nfserr; |
| 1429 | |
Sachin Prabhu | 1574dff | 2011-04-20 13:09:35 +0100 | [diff] [blame] | 1430 | /* If file doesn't exist, check for permissions to create one */ |
| 1431 | if (!dchild->d_inode) { |
| 1432 | err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_CREATE); |
| 1433 | if (err) |
| 1434 | goto out; |
| 1435 | } |
| 1436 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1437 | err = fh_compose(resfhp, fhp->fh_export, dchild, fhp); |
| 1438 | if (err) |
| 1439 | goto out; |
| 1440 | |
Mi Jinlong | ac6721a | 2011-04-20 17:06:25 +0800 | [diff] [blame] | 1441 | if (nfsd_create_is_exclusive(createmode)) { |
Peter Staubach | c397852 | 2007-01-26 00:57:00 -0800 | [diff] [blame] | 1442 | /* solaris7 gets confused (bugid 4218508) if these have |
Jeff Layton | 749997e | 2007-07-31 00:37:51 -0700 | [diff] [blame] | 1443 | * the high bit set, so just clear the high bits. If this is |
| 1444 | * ever changed to use different attrs for storing the |
| 1445 | * verifier, then do_open_lookup() will also need to be fixed |
| 1446 | * accordingly. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1447 | */ |
| 1448 | v_mtime = verifier[0]&0x7fffffff; |
| 1449 | v_atime = verifier[1]&0x7fffffff; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1450 | } |
| 1451 | |
Al Viro | bad0dcf | 2011-11-23 12:03:18 -0500 | [diff] [blame] | 1452 | host_err = fh_want_write(fhp); |
Dave Hansen | 463c319 | 2008-02-15 14:37:57 -0800 | [diff] [blame] | 1453 | if (host_err) |
| 1454 | goto out_nfserr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1455 | if (dchild->d_inode) { |
| 1456 | err = 0; |
| 1457 | |
| 1458 | switch (createmode) { |
| 1459 | case NFS3_CREATE_UNCHECKED: |
| 1460 | if (! S_ISREG(dchild->d_inode->i_mode)) |
| 1461 | err = nfserr_exist; |
| 1462 | else if (truncp) { |
| 1463 | /* in nfsv4, we need to treat this case a little |
| 1464 | * differently. we don't want to truncate the |
| 1465 | * file now; this would be wrong if the OPEN |
| 1466 | * fails for some other reason. furthermore, |
| 1467 | * if the size is nonzero, we should ignore it |
| 1468 | * according to spec! |
| 1469 | */ |
| 1470 | *truncp = (iap->ia_valid & ATTR_SIZE) && !iap->ia_size; |
| 1471 | } |
| 1472 | else { |
| 1473 | iap->ia_valid &= ATTR_SIZE; |
| 1474 | goto set_attr; |
| 1475 | } |
| 1476 | break; |
| 1477 | case NFS3_CREATE_EXCLUSIVE: |
| 1478 | if ( dchild->d_inode->i_mtime.tv_sec == v_mtime |
| 1479 | && dchild->d_inode->i_atime.tv_sec == v_atime |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1480 | && dchild->d_inode->i_size == 0 ) |
| 1481 | break; |
Mi Jinlong | ac6721a | 2011-04-20 17:06:25 +0800 | [diff] [blame] | 1482 | case NFS4_CREATE_EXCLUSIVE4_1: |
| 1483 | if ( dchild->d_inode->i_mtime.tv_sec == v_mtime |
| 1484 | && dchild->d_inode->i_atime.tv_sec == v_atime |
| 1485 | && dchild->d_inode->i_size == 0 ) |
| 1486 | goto set_attr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1487 | /* fallthru */ |
| 1488 | case NFS3_CREATE_GUARDED: |
| 1489 | err = nfserr_exist; |
| 1490 | } |
Al Viro | bad0dcf | 2011-11-23 12:03:18 -0500 | [diff] [blame] | 1491 | fh_drop_write(fhp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1492 | goto out; |
| 1493 | } |
| 1494 | |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1495 | host_err = vfs_create(dirp, dchild, iap->ia_mode, NULL); |
Dave Hansen | 463c319 | 2008-02-15 14:37:57 -0800 | [diff] [blame] | 1496 | if (host_err < 0) { |
Al Viro | bad0dcf | 2011-11-23 12:03:18 -0500 | [diff] [blame] | 1497 | fh_drop_write(fhp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1498 | goto out_nfserr; |
Dave Hansen | 463c319 | 2008-02-15 14:37:57 -0800 | [diff] [blame] | 1499 | } |
J. Bruce Fields | 81ac95c | 2006-11-08 17:44:40 -0800 | [diff] [blame] | 1500 | if (created) |
| 1501 | *created = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1502 | |
wengang wang | 4ac35c2 | 2009-02-10 11:27:51 +0800 | [diff] [blame] | 1503 | nfsd_check_ignore_resizing(iap); |
| 1504 | |
Mi Jinlong | ac6721a | 2011-04-20 17:06:25 +0800 | [diff] [blame] | 1505 | if (nfsd_create_is_exclusive(createmode)) { |
Peter Staubach | c397852 | 2007-01-26 00:57:00 -0800 | [diff] [blame] | 1506 | /* Cram the verifier into atime/mtime */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1507 | iap->ia_valid = ATTR_MTIME|ATTR_ATIME |
Peter Staubach | c397852 | 2007-01-26 00:57:00 -0800 | [diff] [blame] | 1508 | | ATTR_MTIME_SET|ATTR_ATIME_SET; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1509 | /* XXX someone who knows this better please fix it for nsec */ |
| 1510 | iap->ia_mtime.tv_sec = v_mtime; |
| 1511 | iap->ia_atime.tv_sec = v_atime; |
| 1512 | iap->ia_mtime.tv_nsec = 0; |
| 1513 | iap->ia_atime.tv_nsec = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1514 | } |
| 1515 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1516 | set_attr: |
Ben Myers | f501912 | 2010-02-17 14:05:11 -0600 | [diff] [blame] | 1517 | err = nfsd_create_setattr(rqstp, resfhp, iap); |
| 1518 | |
| 1519 | /* |
| 1520 | * nfsd_setattr already committed the child (and possibly also the parent). |
| 1521 | */ |
| 1522 | if (!err) |
| 1523 | err = nfserrno(commit_metadata(fhp)); |
YAMAMOTO Takashi | f193fba | 2006-01-18 17:43:13 -0800 | [diff] [blame] | 1524 | |
Al Viro | bad0dcf | 2011-11-23 12:03:18 -0500 | [diff] [blame] | 1525 | fh_drop_write(fhp); |
YAMAMOTO Takashi | f193fba | 2006-01-18 17:43:13 -0800 | [diff] [blame] | 1526 | /* |
| 1527 | * Update the filehandle to get the new inode info. |
| 1528 | */ |
| 1529 | if (!err) |
| 1530 | err = fh_update(resfhp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1531 | |
| 1532 | out: |
| 1533 | fh_unlock(fhp); |
| 1534 | if (dchild && !IS_ERR(dchild)) |
| 1535 | dput(dchild); |
| 1536 | return err; |
| 1537 | |
| 1538 | out_nfserr: |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1539 | err = nfserrno(host_err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1540 | goto out; |
| 1541 | } |
| 1542 | #endif /* CONFIG_NFSD_V3 */ |
| 1543 | |
| 1544 | /* |
| 1545 | * Read a symlink. On entry, *lenp must contain the maximum path length that |
| 1546 | * fits into the buffer. On return, it contains the true length. |
| 1547 | * N.B. After this call fhp needs an fh_put |
| 1548 | */ |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1549 | __be32 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1550 | nfsd_readlink(struct svc_rqst *rqstp, struct svc_fh *fhp, char *buf, int *lenp) |
| 1551 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1552 | struct inode *inode; |
| 1553 | mm_segment_t oldfs; |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1554 | __be32 err; |
| 1555 | int host_err; |
Al Viro | 68ac123 | 2012-03-15 08:21:57 -0400 | [diff] [blame] | 1556 | struct path path; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1557 | |
Miklos Szeredi | 8837abc | 2008-06-16 13:20:29 +0200 | [diff] [blame] | 1558 | err = fh_verify(rqstp, fhp, S_IFLNK, NFSD_MAY_NOP); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1559 | if (err) |
| 1560 | goto out; |
| 1561 | |
Al Viro | 68ac123 | 2012-03-15 08:21:57 -0400 | [diff] [blame] | 1562 | path.mnt = fhp->fh_export->ex_path.mnt; |
| 1563 | path.dentry = fhp->fh_dentry; |
| 1564 | inode = path.dentry->d_inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1565 | |
| 1566 | err = nfserr_inval; |
Al Viro | acfa438 | 2008-12-04 10:06:33 -0500 | [diff] [blame] | 1567 | if (!inode->i_op->readlink) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1568 | goto out; |
| 1569 | |
Al Viro | 68ac123 | 2012-03-15 08:21:57 -0400 | [diff] [blame] | 1570 | touch_atime(&path); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1571 | /* N.B. Why does this call need a get_fs()?? |
| 1572 | * Remove the set_fs and watch the fireworks:-) --okir |
| 1573 | */ |
| 1574 | |
| 1575 | oldfs = get_fs(); set_fs(KERNEL_DS); |
Al Viro | 68ac123 | 2012-03-15 08:21:57 -0400 | [diff] [blame] | 1576 | host_err = inode->i_op->readlink(path.dentry, buf, *lenp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1577 | set_fs(oldfs); |
| 1578 | |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1579 | if (host_err < 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1580 | goto out_nfserr; |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1581 | *lenp = host_err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1582 | err = 0; |
| 1583 | out: |
| 1584 | return err; |
| 1585 | |
| 1586 | out_nfserr: |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1587 | err = nfserrno(host_err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1588 | goto out; |
| 1589 | } |
| 1590 | |
| 1591 | /* |
| 1592 | * Create a symlink and look up its inode |
| 1593 | * N.B. After this call _both_ fhp and resfhp need an fh_put |
| 1594 | */ |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1595 | __be32 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1596 | nfsd_symlink(struct svc_rqst *rqstp, struct svc_fh *fhp, |
| 1597 | char *fname, int flen, |
| 1598 | char *path, int plen, |
| 1599 | struct svc_fh *resfhp, |
| 1600 | struct iattr *iap) |
| 1601 | { |
| 1602 | struct dentry *dentry, *dnew; |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1603 | __be32 err, cerr; |
| 1604 | int host_err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1605 | |
| 1606 | err = nfserr_noent; |
| 1607 | if (!flen || !plen) |
| 1608 | goto out; |
| 1609 | err = nfserr_exist; |
| 1610 | if (isdotent(fname, flen)) |
| 1611 | goto out; |
| 1612 | |
Miklos Szeredi | 8837abc | 2008-06-16 13:20:29 +0200 | [diff] [blame] | 1613 | err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_CREATE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1614 | if (err) |
| 1615 | goto out; |
| 1616 | fh_lock(fhp); |
| 1617 | dentry = fhp->fh_dentry; |
| 1618 | dnew = lookup_one_len(fname, dentry, flen); |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1619 | host_err = PTR_ERR(dnew); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1620 | if (IS_ERR(dnew)) |
| 1621 | goto out_nfserr; |
| 1622 | |
Al Viro | bad0dcf | 2011-11-23 12:03:18 -0500 | [diff] [blame] | 1623 | host_err = fh_want_write(fhp); |
Dave Hansen | 75c3f29 | 2008-02-15 14:37:45 -0800 | [diff] [blame] | 1624 | if (host_err) |
| 1625 | goto out_nfserr; |
| 1626 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1627 | if (unlikely(path[plen] != 0)) { |
| 1628 | char *path_alloced = kmalloc(plen+1, GFP_KERNEL); |
| 1629 | if (path_alloced == NULL) |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1630 | host_err = -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1631 | else { |
| 1632 | strncpy(path_alloced, path, plen); |
| 1633 | path_alloced[plen] = 0; |
Miklos Szeredi | db2e747 | 2008-06-24 16:50:16 +0200 | [diff] [blame] | 1634 | host_err = vfs_symlink(dentry->d_inode, dnew, path_alloced); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1635 | kfree(path_alloced); |
| 1636 | } |
| 1637 | } else |
Miklos Szeredi | db2e747 | 2008-06-24 16:50:16 +0200 | [diff] [blame] | 1638 | host_err = vfs_symlink(dentry->d_inode, dnew, path); |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1639 | err = nfserrno(host_err); |
Ben Myers | f501912 | 2010-02-17 14:05:11 -0600 | [diff] [blame] | 1640 | if (!err) |
| 1641 | err = nfserrno(commit_metadata(fhp)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1642 | fh_unlock(fhp); |
| 1643 | |
Al Viro | bad0dcf | 2011-11-23 12:03:18 -0500 | [diff] [blame] | 1644 | fh_drop_write(fhp); |
Dave Hansen | 75c3f29 | 2008-02-15 14:37:45 -0800 | [diff] [blame] | 1645 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1646 | cerr = fh_compose(resfhp, fhp->fh_export, dnew, fhp); |
| 1647 | dput(dnew); |
| 1648 | if (err==0) err = cerr; |
| 1649 | out: |
| 1650 | return err; |
| 1651 | |
| 1652 | out_nfserr: |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1653 | err = nfserrno(host_err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1654 | goto out; |
| 1655 | } |
| 1656 | |
| 1657 | /* |
| 1658 | * Create a hardlink |
| 1659 | * N.B. After this call _both_ ffhp and tfhp need an fh_put |
| 1660 | */ |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1661 | __be32 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1662 | nfsd_link(struct svc_rqst *rqstp, struct svc_fh *ffhp, |
| 1663 | char *name, int len, struct svc_fh *tfhp) |
| 1664 | { |
| 1665 | struct dentry *ddir, *dnew, *dold; |
J. Bruce Fields | 55b1335 | 2010-07-19 16:38:24 -0400 | [diff] [blame] | 1666 | struct inode *dirp; |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1667 | __be32 err; |
| 1668 | int host_err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1669 | |
Miklos Szeredi | 8837abc | 2008-06-16 13:20:29 +0200 | [diff] [blame] | 1670 | err = fh_verify(rqstp, ffhp, S_IFDIR, NFSD_MAY_CREATE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1671 | if (err) |
| 1672 | goto out; |
J. Bruce Fields | 7d818a7 | 2011-08-15 16:59:55 -0400 | [diff] [blame] | 1673 | err = fh_verify(rqstp, tfhp, 0, NFSD_MAY_NOP); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1674 | if (err) |
| 1675 | goto out; |
J. Bruce Fields | 7d818a7 | 2011-08-15 16:59:55 -0400 | [diff] [blame] | 1676 | err = nfserr_isdir; |
| 1677 | if (S_ISDIR(tfhp->fh_dentry->d_inode->i_mode)) |
| 1678 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1679 | err = nfserr_perm; |
| 1680 | if (!len) |
| 1681 | goto out; |
| 1682 | err = nfserr_exist; |
| 1683 | if (isdotent(name, len)) |
| 1684 | goto out; |
| 1685 | |
Peter Zijlstra | 12fd352 | 2006-10-02 02:18:03 -0700 | [diff] [blame] | 1686 | fh_lock_nested(ffhp, I_MUTEX_PARENT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1687 | ddir = ffhp->fh_dentry; |
| 1688 | dirp = ddir->d_inode; |
| 1689 | |
| 1690 | dnew = lookup_one_len(name, ddir, len); |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1691 | host_err = PTR_ERR(dnew); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1692 | if (IS_ERR(dnew)) |
| 1693 | goto out_nfserr; |
| 1694 | |
| 1695 | dold = tfhp->fh_dentry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1696 | |
Al Viro | bad0dcf | 2011-11-23 12:03:18 -0500 | [diff] [blame] | 1697 | host_err = fh_want_write(tfhp); |
Dave Hansen | 75c3f29 | 2008-02-15 14:37:45 -0800 | [diff] [blame] | 1698 | if (host_err) { |
| 1699 | err = nfserrno(host_err); |
| 1700 | goto out_dput; |
| 1701 | } |
J. Bruce Fields | 4795bb3 | 2011-01-11 13:55:46 -0500 | [diff] [blame] | 1702 | err = nfserr_noent; |
| 1703 | if (!dold->d_inode) |
| 1704 | goto out_drop_write; |
| 1705 | host_err = nfsd_break_lease(dold->d_inode); |
Casey Bodley | 7d751f6 | 2011-06-03 12:21:23 -0400 | [diff] [blame] | 1706 | if (host_err) { |
| 1707 | err = nfserrno(host_err); |
J. Bruce Fields | 4795bb3 | 2011-01-11 13:55:46 -0500 | [diff] [blame] | 1708 | goto out_drop_write; |
Casey Bodley | 7d751f6 | 2011-06-03 12:21:23 -0400 | [diff] [blame] | 1709 | } |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1710 | host_err = vfs_link(dold, dirp, dnew); |
| 1711 | if (!host_err) { |
Ben Myers | f501912 | 2010-02-17 14:05:11 -0600 | [diff] [blame] | 1712 | err = nfserrno(commit_metadata(ffhp)); |
| 1713 | if (!err) |
| 1714 | err = nfserrno(commit_metadata(tfhp)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1715 | } else { |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1716 | if (host_err == -EXDEV && rqstp->rq_vers == 2) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1717 | err = nfserr_acces; |
| 1718 | else |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1719 | err = nfserrno(host_err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1720 | } |
J. Bruce Fields | 4795bb3 | 2011-01-11 13:55:46 -0500 | [diff] [blame] | 1721 | out_drop_write: |
Al Viro | bad0dcf | 2011-11-23 12:03:18 -0500 | [diff] [blame] | 1722 | fh_drop_write(tfhp); |
Dave Hansen | 75c3f29 | 2008-02-15 14:37:45 -0800 | [diff] [blame] | 1723 | out_dput: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1724 | dput(dnew); |
David M. Richter | 270d56e | 2006-06-30 01:56:15 -0700 | [diff] [blame] | 1725 | out_unlock: |
| 1726 | fh_unlock(ffhp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1727 | out: |
| 1728 | return err; |
| 1729 | |
| 1730 | out_nfserr: |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1731 | err = nfserrno(host_err); |
David M. Richter | 270d56e | 2006-06-30 01:56:15 -0700 | [diff] [blame] | 1732 | goto out_unlock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1733 | } |
| 1734 | |
| 1735 | /* |
| 1736 | * Rename a file |
| 1737 | * N.B. After this call _both_ ffhp and tfhp need an fh_put |
| 1738 | */ |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1739 | __be32 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1740 | nfsd_rename(struct svc_rqst *rqstp, struct svc_fh *ffhp, char *fname, int flen, |
| 1741 | struct svc_fh *tfhp, char *tname, int tlen) |
| 1742 | { |
| 1743 | struct dentry *fdentry, *tdentry, *odentry, *ndentry, *trap; |
| 1744 | struct inode *fdir, *tdir; |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1745 | __be32 err; |
| 1746 | int host_err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1747 | |
Miklos Szeredi | 8837abc | 2008-06-16 13:20:29 +0200 | [diff] [blame] | 1748 | err = fh_verify(rqstp, ffhp, S_IFDIR, NFSD_MAY_REMOVE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1749 | if (err) |
| 1750 | goto out; |
Miklos Szeredi | 8837abc | 2008-06-16 13:20:29 +0200 | [diff] [blame] | 1751 | err = fh_verify(rqstp, tfhp, S_IFDIR, NFSD_MAY_CREATE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1752 | if (err) |
| 1753 | goto out; |
| 1754 | |
| 1755 | fdentry = ffhp->fh_dentry; |
| 1756 | fdir = fdentry->d_inode; |
| 1757 | |
| 1758 | tdentry = tfhp->fh_dentry; |
| 1759 | tdir = tdentry->d_inode; |
| 1760 | |
| 1761 | err = (rqstp->rq_vers == 2) ? nfserr_acces : nfserr_xdev; |
NeilBrown | a56f393 | 2006-06-30 01:56:10 -0700 | [diff] [blame] | 1762 | if (ffhp->fh_export != tfhp->fh_export) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1763 | goto out; |
| 1764 | |
| 1765 | err = nfserr_perm; |
| 1766 | if (!flen || isdotent(fname, flen) || !tlen || isdotent(tname, tlen)) |
| 1767 | goto out; |
| 1768 | |
| 1769 | /* cannot use fh_lock as we need deadlock protective ordering |
| 1770 | * so do it by hand */ |
| 1771 | trap = lock_rename(tdentry, fdentry); |
| 1772 | ffhp->fh_locked = tfhp->fh_locked = 1; |
| 1773 | fill_pre_wcc(ffhp); |
| 1774 | fill_pre_wcc(tfhp); |
| 1775 | |
| 1776 | odentry = lookup_one_len(fname, fdentry, flen); |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1777 | host_err = PTR_ERR(odentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1778 | if (IS_ERR(odentry)) |
| 1779 | goto out_nfserr; |
| 1780 | |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1781 | host_err = -ENOENT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1782 | if (!odentry->d_inode) |
| 1783 | goto out_dput_old; |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1784 | host_err = -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1785 | if (odentry == trap) |
| 1786 | goto out_dput_old; |
| 1787 | |
| 1788 | ndentry = lookup_one_len(tname, tdentry, tlen); |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1789 | host_err = PTR_ERR(ndentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1790 | if (IS_ERR(ndentry)) |
| 1791 | goto out_dput_old; |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1792 | host_err = -ENOTEMPTY; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1793 | if (ndentry == trap) |
| 1794 | goto out_dput_new; |
| 1795 | |
Dave Hansen | 9079b1e | 2008-02-15 14:37:49 -0800 | [diff] [blame] | 1796 | host_err = -EXDEV; |
| 1797 | if (ffhp->fh_export->ex_path.mnt != tfhp->fh_export->ex_path.mnt) |
| 1798 | goto out_dput_new; |
Al Viro | bad0dcf | 2011-11-23 12:03:18 -0500 | [diff] [blame] | 1799 | host_err = fh_want_write(ffhp); |
Dave Hansen | 9079b1e | 2008-02-15 14:37:49 -0800 | [diff] [blame] | 1800 | if (host_err) |
| 1801 | goto out_dput_new; |
| 1802 | |
J. Bruce Fields | 4795bb3 | 2011-01-11 13:55:46 -0500 | [diff] [blame] | 1803 | host_err = nfsd_break_lease(odentry->d_inode); |
| 1804 | if (host_err) |
| 1805 | goto out_drop_write; |
J. Bruce Fields | 83f6b0c | 2011-02-06 16:46:30 -0500 | [diff] [blame] | 1806 | if (ndentry->d_inode) { |
| 1807 | host_err = nfsd_break_lease(ndentry->d_inode); |
| 1808 | if (host_err) |
| 1809 | goto out_drop_write; |
| 1810 | } |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1811 | host_err = vfs_rename(fdir, odentry, tdir, ndentry); |
Ben Myers | f501912 | 2010-02-17 14:05:11 -0600 | [diff] [blame] | 1812 | if (!host_err) { |
| 1813 | host_err = commit_metadata(tfhp); |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1814 | if (!host_err) |
Ben Myers | f501912 | 2010-02-17 14:05:11 -0600 | [diff] [blame] | 1815 | host_err = commit_metadata(ffhp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1816 | } |
J. Bruce Fields | 4795bb3 | 2011-01-11 13:55:46 -0500 | [diff] [blame] | 1817 | out_drop_write: |
Al Viro | bad0dcf | 2011-11-23 12:03:18 -0500 | [diff] [blame] | 1818 | fh_drop_write(ffhp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1819 | out_dput_new: |
| 1820 | dput(ndentry); |
| 1821 | out_dput_old: |
| 1822 | dput(odentry); |
| 1823 | out_nfserr: |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1824 | err = nfserrno(host_err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1825 | |
| 1826 | /* we cannot reply on fh_unlock on the two filehandles, |
| 1827 | * as that would do the wrong thing if the two directories |
| 1828 | * were the same, so again we do it by hand |
| 1829 | */ |
| 1830 | fill_post_wcc(ffhp); |
| 1831 | fill_post_wcc(tfhp); |
| 1832 | unlock_rename(tdentry, fdentry); |
| 1833 | ffhp->fh_locked = tfhp->fh_locked = 0; |
| 1834 | |
| 1835 | out: |
| 1836 | return err; |
| 1837 | } |
| 1838 | |
| 1839 | /* |
| 1840 | * Unlink a file or directory |
| 1841 | * N.B. After this call fhp needs an fh_put |
| 1842 | */ |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1843 | __be32 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1844 | nfsd_unlink(struct svc_rqst *rqstp, struct svc_fh *fhp, int type, |
| 1845 | char *fname, int flen) |
| 1846 | { |
| 1847 | struct dentry *dentry, *rdentry; |
| 1848 | struct inode *dirp; |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1849 | __be32 err; |
| 1850 | int host_err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1851 | |
| 1852 | err = nfserr_acces; |
| 1853 | if (!flen || isdotent(fname, flen)) |
| 1854 | goto out; |
Miklos Szeredi | 8837abc | 2008-06-16 13:20:29 +0200 | [diff] [blame] | 1855 | err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_REMOVE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1856 | if (err) |
| 1857 | goto out; |
| 1858 | |
Peter Zijlstra | 12fd352 | 2006-10-02 02:18:03 -0700 | [diff] [blame] | 1859 | fh_lock_nested(fhp, I_MUTEX_PARENT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1860 | dentry = fhp->fh_dentry; |
| 1861 | dirp = dentry->d_inode; |
| 1862 | |
| 1863 | rdentry = lookup_one_len(fname, dentry, flen); |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1864 | host_err = PTR_ERR(rdentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1865 | if (IS_ERR(rdentry)) |
| 1866 | goto out_nfserr; |
| 1867 | |
| 1868 | if (!rdentry->d_inode) { |
| 1869 | dput(rdentry); |
| 1870 | err = nfserr_noent; |
| 1871 | goto out; |
| 1872 | } |
| 1873 | |
| 1874 | if (!type) |
| 1875 | type = rdentry->d_inode->i_mode & S_IFMT; |
| 1876 | |
Al Viro | bad0dcf | 2011-11-23 12:03:18 -0500 | [diff] [blame] | 1877 | host_err = fh_want_write(fhp); |
Dave Hansen | 0622753 | 2008-02-15 14:37:34 -0800 | [diff] [blame] | 1878 | if (host_err) |
J. Bruce Fields | 541ce98 | 2011-01-14 20:00:02 -0500 | [diff] [blame] | 1879 | goto out_put; |
Dave Hansen | 0622753 | 2008-02-15 14:37:34 -0800 | [diff] [blame] | 1880 | |
J. Bruce Fields | 4795bb3 | 2011-01-11 13:55:46 -0500 | [diff] [blame] | 1881 | host_err = nfsd_break_lease(rdentry->d_inode); |
| 1882 | if (host_err) |
J. Bruce Fields | 541ce98 | 2011-01-14 20:00:02 -0500 | [diff] [blame] | 1883 | goto out_drop_write; |
J. Bruce Fields | 9ce137e | 2011-01-11 14:07:12 -0500 | [diff] [blame] | 1884 | if (type != S_IFDIR) |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1885 | host_err = vfs_unlink(dirp, rdentry); |
J. Bruce Fields | 9ce137e | 2011-01-11 14:07:12 -0500 | [diff] [blame] | 1886 | else |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1887 | host_err = vfs_rmdir(dirp, rdentry); |
J. Bruce Fields | 541ce98 | 2011-01-14 20:00:02 -0500 | [diff] [blame] | 1888 | if (!host_err) |
| 1889 | host_err = commit_metadata(fhp); |
| 1890 | out_drop_write: |
Al Viro | bad0dcf | 2011-11-23 12:03:18 -0500 | [diff] [blame] | 1891 | fh_drop_write(fhp); |
J. Bruce Fields | 4795bb3 | 2011-01-11 13:55:46 -0500 | [diff] [blame] | 1892 | out_put: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1893 | dput(rdentry); |
| 1894 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1895 | out_nfserr: |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1896 | err = nfserrno(host_err); |
YAMAMOTO Takashi | f193fba | 2006-01-18 17:43:13 -0800 | [diff] [blame] | 1897 | out: |
| 1898 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1899 | } |
| 1900 | |
| 1901 | /* |
David Woodhouse | 14f7dd6 | 2008-07-31 20:29:12 +0100 | [diff] [blame] | 1902 | * We do this buffering because we must not call back into the file |
| 1903 | * system's ->lookup() method from the filldir callback. That may well |
| 1904 | * deadlock a number of file systems. |
| 1905 | * |
| 1906 | * This is based heavily on the implementation of same in XFS. |
| 1907 | */ |
| 1908 | struct buffered_dirent { |
| 1909 | u64 ino; |
| 1910 | loff_t offset; |
| 1911 | int namlen; |
| 1912 | unsigned int d_type; |
| 1913 | char name[]; |
| 1914 | }; |
| 1915 | |
| 1916 | struct readdir_data { |
| 1917 | char *dirent; |
| 1918 | size_t used; |
Al Viro | 53c9c5c | 2008-08-24 07:29:52 -0400 | [diff] [blame] | 1919 | int full; |
David Woodhouse | 14f7dd6 | 2008-07-31 20:29:12 +0100 | [diff] [blame] | 1920 | }; |
| 1921 | |
| 1922 | static int nfsd_buffered_filldir(void *__buf, const char *name, int namlen, |
| 1923 | loff_t offset, u64 ino, unsigned int d_type) |
David Woodhouse | 2628b76 | 2008-07-31 17:16:51 +0100 | [diff] [blame] | 1924 | { |
David Woodhouse | 14f7dd6 | 2008-07-31 20:29:12 +0100 | [diff] [blame] | 1925 | struct readdir_data *buf = __buf; |
| 1926 | struct buffered_dirent *de = (void *)(buf->dirent + buf->used); |
| 1927 | unsigned int reclen; |
| 1928 | |
| 1929 | reclen = ALIGN(sizeof(struct buffered_dirent) + namlen, sizeof(u64)); |
Al Viro | 53c9c5c | 2008-08-24 07:29:52 -0400 | [diff] [blame] | 1930 | if (buf->used + reclen > PAGE_SIZE) { |
| 1931 | buf->full = 1; |
David Woodhouse | 14f7dd6 | 2008-07-31 20:29:12 +0100 | [diff] [blame] | 1932 | return -EINVAL; |
Al Viro | 53c9c5c | 2008-08-24 07:29:52 -0400 | [diff] [blame] | 1933 | } |
David Woodhouse | 14f7dd6 | 2008-07-31 20:29:12 +0100 | [diff] [blame] | 1934 | |
| 1935 | de->namlen = namlen; |
| 1936 | de->offset = offset; |
| 1937 | de->ino = ino; |
| 1938 | de->d_type = d_type; |
| 1939 | memcpy(de->name, name, namlen); |
| 1940 | buf->used += reclen; |
| 1941 | |
| 1942 | return 0; |
| 1943 | } |
| 1944 | |
David Woodhouse | 2f9092e | 2009-04-20 23:18:37 +0100 | [diff] [blame] | 1945 | static __be32 nfsd_buffered_readdir(struct file *file, filldir_t func, |
| 1946 | struct readdir_cd *cdp, loff_t *offsetp) |
David Woodhouse | 14f7dd6 | 2008-07-31 20:29:12 +0100 | [diff] [blame] | 1947 | { |
| 1948 | struct readdir_data buf; |
| 1949 | struct buffered_dirent *de; |
David Woodhouse | 2628b76 | 2008-07-31 17:16:51 +0100 | [diff] [blame] | 1950 | int host_err; |
David Woodhouse | 14f7dd6 | 2008-07-31 20:29:12 +0100 | [diff] [blame] | 1951 | int size; |
| 1952 | loff_t offset; |
David Woodhouse | 2628b76 | 2008-07-31 17:16:51 +0100 | [diff] [blame] | 1953 | |
David Woodhouse | 14f7dd6 | 2008-07-31 20:29:12 +0100 | [diff] [blame] | 1954 | buf.dirent = (void *)__get_free_page(GFP_KERNEL); |
| 1955 | if (!buf.dirent) |
David Woodhouse | 2f9092e | 2009-04-20 23:18:37 +0100 | [diff] [blame] | 1956 | return nfserrno(-ENOMEM); |
David Woodhouse | 2628b76 | 2008-07-31 17:16:51 +0100 | [diff] [blame] | 1957 | |
David Woodhouse | 14f7dd6 | 2008-07-31 20:29:12 +0100 | [diff] [blame] | 1958 | offset = *offsetp; |
David Woodhouse | 14f7dd6 | 2008-07-31 20:29:12 +0100 | [diff] [blame] | 1959 | |
| 1960 | while (1) { |
David Woodhouse | 2f9092e | 2009-04-20 23:18:37 +0100 | [diff] [blame] | 1961 | struct inode *dir_inode = file->f_path.dentry->d_inode; |
David Woodhouse | 14f7dd6 | 2008-07-31 20:29:12 +0100 | [diff] [blame] | 1962 | unsigned int reclen; |
| 1963 | |
Doug Nazar | b726e92 | 2008-11-05 06:16:28 -0500 | [diff] [blame] | 1964 | cdp->err = nfserr_eof; /* will be cleared on successful read */ |
David Woodhouse | 14f7dd6 | 2008-07-31 20:29:12 +0100 | [diff] [blame] | 1965 | buf.used = 0; |
Al Viro | 53c9c5c | 2008-08-24 07:29:52 -0400 | [diff] [blame] | 1966 | buf.full = 0; |
David Woodhouse | 14f7dd6 | 2008-07-31 20:29:12 +0100 | [diff] [blame] | 1967 | |
| 1968 | host_err = vfs_readdir(file, nfsd_buffered_filldir, &buf); |
Al Viro | 53c9c5c | 2008-08-24 07:29:52 -0400 | [diff] [blame] | 1969 | if (buf.full) |
| 1970 | host_err = 0; |
| 1971 | |
| 1972 | if (host_err < 0) |
David Woodhouse | 14f7dd6 | 2008-07-31 20:29:12 +0100 | [diff] [blame] | 1973 | break; |
| 1974 | |
| 1975 | size = buf.used; |
| 1976 | |
| 1977 | if (!size) |
| 1978 | break; |
| 1979 | |
David Woodhouse | 2f9092e | 2009-04-20 23:18:37 +0100 | [diff] [blame] | 1980 | /* |
| 1981 | * Various filldir functions may end up calling back into |
| 1982 | * lookup_one_len() and the file system's ->lookup() method. |
| 1983 | * These expect i_mutex to be held, as it would within readdir. |
| 1984 | */ |
| 1985 | host_err = mutex_lock_killable(&dir_inode->i_mutex); |
| 1986 | if (host_err) |
| 1987 | break; |
| 1988 | |
David Woodhouse | 14f7dd6 | 2008-07-31 20:29:12 +0100 | [diff] [blame] | 1989 | de = (struct buffered_dirent *)buf.dirent; |
| 1990 | while (size > 0) { |
| 1991 | offset = de->offset; |
| 1992 | |
| 1993 | if (func(cdp, de->name, de->namlen, de->offset, |
| 1994 | de->ino, de->d_type)) |
David Woodhouse | 2f9092e | 2009-04-20 23:18:37 +0100 | [diff] [blame] | 1995 | break; |
David Woodhouse | 14f7dd6 | 2008-07-31 20:29:12 +0100 | [diff] [blame] | 1996 | |
| 1997 | if (cdp->err != nfs_ok) |
David Woodhouse | 2f9092e | 2009-04-20 23:18:37 +0100 | [diff] [blame] | 1998 | break; |
David Woodhouse | 14f7dd6 | 2008-07-31 20:29:12 +0100 | [diff] [blame] | 1999 | |
| 2000 | reclen = ALIGN(sizeof(*de) + de->namlen, |
| 2001 | sizeof(u64)); |
| 2002 | size -= reclen; |
| 2003 | de = (struct buffered_dirent *)((char *)de + reclen); |
| 2004 | } |
David Woodhouse | 2f9092e | 2009-04-20 23:18:37 +0100 | [diff] [blame] | 2005 | mutex_unlock(&dir_inode->i_mutex); |
| 2006 | if (size > 0) /* We bailed out early */ |
| 2007 | break; |
| 2008 | |
David Woodhouse | c002a6c | 2008-08-17 17:21:18 +0100 | [diff] [blame] | 2009 | offset = vfs_llseek(file, 0, SEEK_CUR); |
David Woodhouse | 14f7dd6 | 2008-07-31 20:29:12 +0100 | [diff] [blame] | 2010 | } |
| 2011 | |
David Woodhouse | 14f7dd6 | 2008-07-31 20:29:12 +0100 | [diff] [blame] | 2012 | free_page((unsigned long)(buf.dirent)); |
David Woodhouse | 2628b76 | 2008-07-31 17:16:51 +0100 | [diff] [blame] | 2013 | |
| 2014 | if (host_err) |
| 2015 | return nfserrno(host_err); |
David Woodhouse | 14f7dd6 | 2008-07-31 20:29:12 +0100 | [diff] [blame] | 2016 | |
| 2017 | *offsetp = offset; |
| 2018 | return cdp->err; |
David Woodhouse | 2628b76 | 2008-07-31 17:16:51 +0100 | [diff] [blame] | 2019 | } |
| 2020 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2021 | /* |
| 2022 | * Read entries from a directory. |
| 2023 | * The NFSv3/4 verifier we ignore for now. |
| 2024 | */ |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 2025 | __be32 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2026 | nfsd_readdir(struct svc_rqst *rqstp, struct svc_fh *fhp, loff_t *offsetp, |
NeilBrown | a0ad13e | 2007-01-26 00:57:10 -0800 | [diff] [blame] | 2027 | struct readdir_cd *cdp, filldir_t func) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2028 | { |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 2029 | __be32 err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2030 | struct file *file; |
| 2031 | loff_t offset = *offsetp; |
Bernd Schubert | 06effdb | 2012-03-18 22:44:50 -0400 | [diff] [blame] | 2032 | int may_flags = NFSD_MAY_READ; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2033 | |
Bernd Schubert | 06effdb | 2012-03-18 22:44:50 -0400 | [diff] [blame] | 2034 | /* NFSv2 only supports 32 bit cookies */ |
| 2035 | if (rqstp->rq_vers > 2) |
| 2036 | may_flags |= NFSD_MAY_64BIT_COOKIE; |
| 2037 | |
| 2038 | err = nfsd_open(rqstp, fhp, S_IFDIR, may_flags, &file); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2039 | if (err) |
| 2040 | goto out; |
| 2041 | |
| 2042 | offset = vfs_llseek(file, offset, 0); |
| 2043 | if (offset < 0) { |
| 2044 | err = nfserrno((int)offset); |
| 2045 | goto out_close; |
| 2046 | } |
| 2047 | |
David Woodhouse | 14f7dd6 | 2008-07-31 20:29:12 +0100 | [diff] [blame] | 2048 | err = nfsd_buffered_readdir(file, func, cdp, offsetp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2049 | |
| 2050 | if (err == nfserr_eof || err == nfserr_toosmall) |
| 2051 | err = nfs_ok; /* can still be found in ->err */ |
| 2052 | out_close: |
| 2053 | nfsd_close(file); |
| 2054 | out: |
| 2055 | return err; |
| 2056 | } |
| 2057 | |
| 2058 | /* |
| 2059 | * Get file system stats |
| 2060 | * N.B. After this call fhp needs an fh_put |
| 2061 | */ |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 2062 | __be32 |
J. Bruce Fields | 04716e6 | 2008-08-07 13:00:20 -0400 | [diff] [blame] | 2063 | 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] | 2064 | { |
Christoph Hellwig | ebabe9a | 2010-07-07 18:53:11 +0200 | [diff] [blame] | 2065 | __be32 err; |
| 2066 | |
| 2067 | err = fh_verify(rqstp, fhp, 0, NFSD_MAY_NOP | access); |
Takashi Iwai | f6360ef | 2010-08-13 15:53:49 +0200 | [diff] [blame] | 2068 | if (!err) { |
| 2069 | struct path path = { |
| 2070 | .mnt = fhp->fh_export->ex_path.mnt, |
| 2071 | .dentry = fhp->fh_dentry, |
| 2072 | }; |
| 2073 | if (vfs_statfs(&path, stat)) |
| 2074 | err = nfserr_io; |
| 2075 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2076 | return err; |
| 2077 | } |
| 2078 | |
J. Bruce Fields | c7d5140 | 2007-07-19 01:49:20 -0700 | [diff] [blame] | 2079 | 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] | 2080 | { |
J. Bruce Fields | c7d5140 | 2007-07-19 01:49:20 -0700 | [diff] [blame] | 2081 | return nfsexp_flags(rqstp, exp) & NFSEXP_READONLY; |
J. Bruce Fields | e22841c | 2007-07-19 01:49:20 -0700 | [diff] [blame] | 2082 | } |
| 2083 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2084 | /* |
| 2085 | * Check for a user's access permissions to this inode. |
| 2086 | */ |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 2087 | __be32 |
J. Bruce Fields | 0ec757d | 2007-07-17 04:04:48 -0700 | [diff] [blame] | 2088 | nfsd_permission(struct svc_rqst *rqstp, struct svc_export *exp, |
| 2089 | struct dentry *dentry, int acc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2090 | { |
| 2091 | struct inode *inode = dentry->d_inode; |
| 2092 | int err; |
| 2093 | |
J. Bruce Fields | aea9339 | 2011-04-10 10:35:12 -0400 | [diff] [blame] | 2094 | if ((acc & NFSD_MAY_MASK) == NFSD_MAY_NOP) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2095 | return 0; |
| 2096 | #if 0 |
| 2097 | dprintk("nfsd: permission 0x%x%s%s%s%s%s%s%s mode 0%o%s%s%s\n", |
| 2098 | acc, |
Miklos Szeredi | 8837abc | 2008-06-16 13:20:29 +0200 | [diff] [blame] | 2099 | (acc & NFSD_MAY_READ)? " read" : "", |
| 2100 | (acc & NFSD_MAY_WRITE)? " write" : "", |
| 2101 | (acc & NFSD_MAY_EXEC)? " exec" : "", |
| 2102 | (acc & NFSD_MAY_SATTR)? " sattr" : "", |
| 2103 | (acc & NFSD_MAY_TRUNC)? " trunc" : "", |
| 2104 | (acc & NFSD_MAY_LOCK)? " lock" : "", |
| 2105 | (acc & NFSD_MAY_OWNER_OVERRIDE)? " owneroverride" : "", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2106 | inode->i_mode, |
| 2107 | IS_IMMUTABLE(inode)? " immut" : "", |
| 2108 | IS_APPEND(inode)? " append" : "", |
Dave Hansen | 2c463e9 | 2008-02-15 14:37:56 -0800 | [diff] [blame] | 2109 | __mnt_is_readonly(exp->ex_path.mnt)? " ro" : ""); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2110 | dprintk(" owner %d/%d user %d/%d\n", |
David Howells | 5cc0a84 | 2008-11-14 10:38:58 +1100 | [diff] [blame] | 2111 | inode->i_uid, inode->i_gid, current_fsuid(), current_fsgid()); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2112 | #endif |
| 2113 | |
| 2114 | /* Normally we reject any write/sattr etc access on a read-only file |
| 2115 | * system. But if it is IRIX doing check on write-access for a |
| 2116 | * device special file, we ignore rofs. |
| 2117 | */ |
Miklos Szeredi | 8837abc | 2008-06-16 13:20:29 +0200 | [diff] [blame] | 2118 | if (!(acc & NFSD_MAY_LOCAL_ACCESS)) |
| 2119 | if (acc & (NFSD_MAY_WRITE | NFSD_MAY_SATTR | NFSD_MAY_TRUNC)) { |
Dave Hansen | 2c463e9 | 2008-02-15 14:37:56 -0800 | [diff] [blame] | 2120 | if (exp_rdonly(rqstp, exp) || |
| 2121 | __mnt_is_readonly(exp->ex_path.mnt)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2122 | return nfserr_rofs; |
Miklos Szeredi | 8837abc | 2008-06-16 13:20:29 +0200 | [diff] [blame] | 2123 | if (/* (acc & NFSD_MAY_WRITE) && */ IS_IMMUTABLE(inode)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2124 | return nfserr_perm; |
| 2125 | } |
Miklos Szeredi | 8837abc | 2008-06-16 13:20:29 +0200 | [diff] [blame] | 2126 | if ((acc & NFSD_MAY_TRUNC) && IS_APPEND(inode)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2127 | return nfserr_perm; |
| 2128 | |
Miklos Szeredi | 8837abc | 2008-06-16 13:20:29 +0200 | [diff] [blame] | 2129 | if (acc & NFSD_MAY_LOCK) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2130 | /* If we cannot rely on authentication in NLM requests, |
| 2131 | * just allow locks, otherwise require read permission, or |
| 2132 | * ownership |
| 2133 | */ |
| 2134 | if (exp->ex_flags & NFSEXP_NOAUTHNLM) |
| 2135 | return 0; |
| 2136 | else |
Miklos Szeredi | 8837abc | 2008-06-16 13:20:29 +0200 | [diff] [blame] | 2137 | acc = NFSD_MAY_READ | NFSD_MAY_OWNER_OVERRIDE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2138 | } |
| 2139 | /* |
| 2140 | * The file owner always gets access permission for accesses that |
| 2141 | * would normally be checked at open time. This is to make |
| 2142 | * file access work even when the client has done a fchmod(fd, 0). |
| 2143 | * |
| 2144 | * However, `cp foo bar' should fail nevertheless when bar is |
| 2145 | * readonly. A sensible way to do this might be to reject all |
| 2146 | * attempts to truncate a read-only file, because a creat() call |
| 2147 | * always implies file truncation. |
| 2148 | * ... but this isn't really fair. A process may reasonably call |
| 2149 | * ftruncate on an open file descriptor on a file with perm 000. |
| 2150 | * We must trust the client to do permission checking - using "ACCESS" |
| 2151 | * with NFSv3. |
| 2152 | */ |
Miklos Szeredi | 8837abc | 2008-06-16 13:20:29 +0200 | [diff] [blame] | 2153 | if ((acc & NFSD_MAY_OWNER_OVERRIDE) && |
David Howells | 5cc0a84 | 2008-11-14 10:38:58 +1100 | [diff] [blame] | 2154 | inode->i_uid == current_fsuid()) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2155 | return 0; |
| 2156 | |
Miklos Szeredi | 8837abc | 2008-06-16 13:20:29 +0200 | [diff] [blame] | 2157 | /* This assumes NFSD_MAY_{READ,WRITE,EXEC} == MAY_{READ,WRITE,EXEC} */ |
Al Viro | f419a2e | 2008-07-22 00:07:17 -0400 | [diff] [blame] | 2158 | err = inode_permission(inode, acc & (MAY_READ|MAY_WRITE|MAY_EXEC)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2159 | |
| 2160 | /* Allow read access to binaries even when mode 111 */ |
| 2161 | if (err == -EACCES && S_ISREG(inode->i_mode) && |
J. Bruce Fields | a043226 | 2011-08-25 10:48:39 -0400 | [diff] [blame] | 2162 | (acc == (NFSD_MAY_READ | NFSD_MAY_OWNER_OVERRIDE) || |
| 2163 | acc == (NFSD_MAY_READ | NFSD_MAY_READ_IF_EXEC))) |
Al Viro | f419a2e | 2008-07-22 00:07:17 -0400 | [diff] [blame] | 2164 | err = inode_permission(inode, MAY_EXEC); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2165 | |
| 2166 | return err? nfserrno(err) : 0; |
| 2167 | } |
| 2168 | |
| 2169 | void |
| 2170 | nfsd_racache_shutdown(void) |
| 2171 | { |
Jeff Layton | 54a66e5 | 2008-08-13 22:03:27 -0400 | [diff] [blame] | 2172 | struct raparms *raparm, *last_raparm; |
| 2173 | unsigned int i; |
| 2174 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2175 | dprintk("nfsd: freeing readahead buffers.\n"); |
Jeff Layton | 54a66e5 | 2008-08-13 22:03:27 -0400 | [diff] [blame] | 2176 | |
| 2177 | for (i = 0; i < RAPARM_HASH_SIZE; i++) { |
| 2178 | raparm = raparm_hash[i].pb_head; |
| 2179 | while(raparm) { |
| 2180 | last_raparm = raparm; |
| 2181 | raparm = raparm->p_next; |
| 2182 | kfree(last_raparm); |
| 2183 | } |
| 2184 | raparm_hash[i].pb_head = NULL; |
| 2185 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2186 | } |
| 2187 | /* |
| 2188 | * Initialize readahead param cache |
| 2189 | */ |
| 2190 | int |
| 2191 | nfsd_racache_init(int cache_size) |
| 2192 | { |
| 2193 | int i; |
Greg Banks | fce1456 | 2006-10-04 02:15:49 -0700 | [diff] [blame] | 2194 | int j = 0; |
| 2195 | int nperbucket; |
Jeff Layton | 54a66e5 | 2008-08-13 22:03:27 -0400 | [diff] [blame] | 2196 | struct raparms **raparm = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2197 | |
Greg Banks | fce1456 | 2006-10-04 02:15:49 -0700 | [diff] [blame] | 2198 | |
Jeff Layton | 54a66e5 | 2008-08-13 22:03:27 -0400 | [diff] [blame] | 2199 | if (raparm_hash[0].pb_head) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2200 | return 0; |
Jeff Layton | 54a66e5 | 2008-08-13 22:03:27 -0400 | [diff] [blame] | 2201 | nperbucket = DIV_ROUND_UP(cache_size, RAPARM_HASH_SIZE); |
| 2202 | if (nperbucket < 2) |
| 2203 | nperbucket = 2; |
| 2204 | cache_size = nperbucket * RAPARM_HASH_SIZE; |
Yan Burman | 4b3bb06 | 2006-12-08 02:39:41 -0800 | [diff] [blame] | 2205 | |
| 2206 | dprintk("nfsd: allocating %d readahead buffers.\n", cache_size); |
Jeff Layton | 54a66e5 | 2008-08-13 22:03:27 -0400 | [diff] [blame] | 2207 | |
| 2208 | for (i = 0; i < RAPARM_HASH_SIZE; i++) { |
Yan Burman | 4b3bb06 | 2006-12-08 02:39:41 -0800 | [diff] [blame] | 2209 | spin_lock_init(&raparm_hash[i].pb_lock); |
Jeff Layton | 54a66e5 | 2008-08-13 22:03:27 -0400 | [diff] [blame] | 2210 | |
| 2211 | raparm = &raparm_hash[i].pb_head; |
| 2212 | for (j = 0; j < nperbucket; j++) { |
| 2213 | *raparm = kzalloc(sizeof(struct raparms), GFP_KERNEL); |
| 2214 | if (!*raparm) |
| 2215 | goto out_nomem; |
| 2216 | raparm = &(*raparm)->p_next; |
| 2217 | } |
| 2218 | *raparm = NULL; |
Yan Burman | 4b3bb06 | 2006-12-08 02:39:41 -0800 | [diff] [blame] | 2219 | } |
| 2220 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2221 | nfsdstats.ra_size = cache_size; |
| 2222 | return 0; |
Jeff Layton | 54a66e5 | 2008-08-13 22:03:27 -0400 | [diff] [blame] | 2223 | |
| 2224 | out_nomem: |
| 2225 | dprintk("nfsd: kmalloc failed, freeing readahead buffers\n"); |
| 2226 | nfsd_racache_shutdown(); |
| 2227 | return -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2228 | } |
Andreas Gruenbacher | a257cdd | 2005-06-22 17:16:26 +0000 | [diff] [blame] | 2229 | |
| 2230 | #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) |
| 2231 | struct posix_acl * |
| 2232 | nfsd_get_posix_acl(struct svc_fh *fhp, int type) |
| 2233 | { |
| 2234 | struct inode *inode = fhp->fh_dentry->d_inode; |
| 2235 | char *name; |
| 2236 | void *value = NULL; |
| 2237 | ssize_t size; |
| 2238 | struct posix_acl *acl; |
| 2239 | |
Christoph Hellwig | 5be196e | 2006-01-09 20:51:55 -0800 | [diff] [blame] | 2240 | if (!IS_POSIXACL(inode)) |
Andreas Gruenbacher | a257cdd | 2005-06-22 17:16:26 +0000 | [diff] [blame] | 2241 | return ERR_PTR(-EOPNOTSUPP); |
Christoph Hellwig | 5be196e | 2006-01-09 20:51:55 -0800 | [diff] [blame] | 2242 | |
| 2243 | switch (type) { |
| 2244 | case ACL_TYPE_ACCESS: |
| 2245 | name = POSIX_ACL_XATTR_ACCESS; |
| 2246 | break; |
| 2247 | case ACL_TYPE_DEFAULT: |
| 2248 | name = POSIX_ACL_XATTR_DEFAULT; |
| 2249 | break; |
| 2250 | default: |
| 2251 | return ERR_PTR(-EOPNOTSUPP); |
Andreas Gruenbacher | a257cdd | 2005-06-22 17:16:26 +0000 | [diff] [blame] | 2252 | } |
| 2253 | |
Christoph Hellwig | 5be196e | 2006-01-09 20:51:55 -0800 | [diff] [blame] | 2254 | size = nfsd_getxattr(fhp->fh_dentry, name, &value); |
| 2255 | if (size < 0) |
| 2256 | return ERR_PTR(size); |
Andreas Gruenbacher | a257cdd | 2005-06-22 17:16:26 +0000 | [diff] [blame] | 2257 | |
Andreas Gruenbacher | a257cdd | 2005-06-22 17:16:26 +0000 | [diff] [blame] | 2258 | acl = posix_acl_from_xattr(value, size); |
Andreas Gruenbacher | a257cdd | 2005-06-22 17:16:26 +0000 | [diff] [blame] | 2259 | kfree(value); |
| 2260 | return acl; |
| 2261 | } |
| 2262 | |
| 2263 | int |
| 2264 | nfsd_set_posix_acl(struct svc_fh *fhp, int type, struct posix_acl *acl) |
| 2265 | { |
| 2266 | struct inode *inode = fhp->fh_dentry->d_inode; |
| 2267 | char *name; |
| 2268 | void *value = NULL; |
| 2269 | size_t size; |
| 2270 | int error; |
| 2271 | |
Al Viro | acfa438 | 2008-12-04 10:06:33 -0500 | [diff] [blame] | 2272 | if (!IS_POSIXACL(inode) || |
Andreas Gruenbacher | a257cdd | 2005-06-22 17:16:26 +0000 | [diff] [blame] | 2273 | !inode->i_op->setxattr || !inode->i_op->removexattr) |
| 2274 | return -EOPNOTSUPP; |
| 2275 | switch(type) { |
| 2276 | case ACL_TYPE_ACCESS: |
Christoph Hellwig | 334a13e | 2005-06-28 20:44:58 -0700 | [diff] [blame] | 2277 | name = POSIX_ACL_XATTR_ACCESS; |
Andreas Gruenbacher | a257cdd | 2005-06-22 17:16:26 +0000 | [diff] [blame] | 2278 | break; |
| 2279 | case ACL_TYPE_DEFAULT: |
Christoph Hellwig | 334a13e | 2005-06-28 20:44:58 -0700 | [diff] [blame] | 2280 | name = POSIX_ACL_XATTR_DEFAULT; |
Andreas Gruenbacher | a257cdd | 2005-06-22 17:16:26 +0000 | [diff] [blame] | 2281 | break; |
| 2282 | default: |
| 2283 | return -EOPNOTSUPP; |
| 2284 | } |
| 2285 | |
| 2286 | if (acl && acl->a_count) { |
Christoph Hellwig | 334a13e | 2005-06-28 20:44:58 -0700 | [diff] [blame] | 2287 | size = posix_acl_xattr_size(acl->a_count); |
Andreas Gruenbacher | a257cdd | 2005-06-22 17:16:26 +0000 | [diff] [blame] | 2288 | value = kmalloc(size, GFP_KERNEL); |
| 2289 | if (!value) |
| 2290 | return -ENOMEM; |
Florin Malita | 9ccfc29 | 2006-05-20 14:59:58 -0700 | [diff] [blame] | 2291 | error = posix_acl_to_xattr(acl, value, size); |
| 2292 | if (error < 0) |
Andreas Gruenbacher | a257cdd | 2005-06-22 17:16:26 +0000 | [diff] [blame] | 2293 | goto getout; |
Florin Malita | 9ccfc29 | 2006-05-20 14:59:58 -0700 | [diff] [blame] | 2294 | size = error; |
Andreas Gruenbacher | a257cdd | 2005-06-22 17:16:26 +0000 | [diff] [blame] | 2295 | } else |
| 2296 | size = 0; |
| 2297 | |
Al Viro | bad0dcf | 2011-11-23 12:03:18 -0500 | [diff] [blame] | 2298 | error = fh_want_write(fhp); |
Dave Hansen | 18f335a | 2008-02-15 14:37:38 -0800 | [diff] [blame] | 2299 | if (error) |
| 2300 | goto getout; |
Andreas Gruenbacher | a257cdd | 2005-06-22 17:16:26 +0000 | [diff] [blame] | 2301 | if (size) |
Christoph Hellwig | 5be196e | 2006-01-09 20:51:55 -0800 | [diff] [blame] | 2302 | error = vfs_setxattr(fhp->fh_dentry, name, value, size, 0); |
Andreas Gruenbacher | a257cdd | 2005-06-22 17:16:26 +0000 | [diff] [blame] | 2303 | else { |
| 2304 | if (!S_ISDIR(inode->i_mode) && type == ACL_TYPE_DEFAULT) |
| 2305 | error = 0; |
| 2306 | else { |
Christoph Hellwig | 5be196e | 2006-01-09 20:51:55 -0800 | [diff] [blame] | 2307 | error = vfs_removexattr(fhp->fh_dentry, name); |
Andreas Gruenbacher | a257cdd | 2005-06-22 17:16:26 +0000 | [diff] [blame] | 2308 | if (error == -ENODATA) |
| 2309 | error = 0; |
| 2310 | } |
| 2311 | } |
Al Viro | bad0dcf | 2011-11-23 12:03:18 -0500 | [diff] [blame] | 2312 | fh_drop_write(fhp); |
Andreas Gruenbacher | a257cdd | 2005-06-22 17:16:26 +0000 | [diff] [blame] | 2313 | |
| 2314 | getout: |
| 2315 | kfree(value); |
| 2316 | return error; |
| 2317 | } |
| 2318 | #endif /* defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) */ |