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 | /* |
Christoph Hellwig | d51f76b | 2013-11-18 05:07:30 -0800 | [diff] [blame] | 300 | * Go over the attributes and take care of the small differences between |
| 301 | * NFS semantics and what Linux expects. |
| 302 | */ |
| 303 | static void |
| 304 | nfsd_sanitize_attrs(struct inode *inode, struct iattr *iap) |
| 305 | { |
| 306 | /* |
| 307 | * NFSv2 does not differentiate between "set-[ac]time-to-now" |
| 308 | * which only requires access, and "set-[ac]time-to-X" which |
| 309 | * requires ownership. |
| 310 | * So if it looks like it might be "set both to the same time which |
| 311 | * is close to now", and if inode_change_ok fails, then we |
| 312 | * convert to "set to now" instead of "set to explicit time" |
| 313 | * |
| 314 | * We only call inode_change_ok as the last test as technically |
| 315 | * it is not an interface that we should be using. |
| 316 | */ |
| 317 | #define BOTH_TIME_SET (ATTR_ATIME_SET | ATTR_MTIME_SET) |
| 318 | #define MAX_TOUCH_TIME_ERROR (30*60) |
| 319 | if ((iap->ia_valid & BOTH_TIME_SET) == BOTH_TIME_SET && |
| 320 | iap->ia_mtime.tv_sec == iap->ia_atime.tv_sec) { |
| 321 | /* |
| 322 | * Looks probable. |
| 323 | * |
| 324 | * Now just make sure time is in the right ballpark. |
| 325 | * Solaris, at least, doesn't seem to care what the time |
| 326 | * request is. We require it be within 30 minutes of now. |
| 327 | */ |
| 328 | time_t delta = iap->ia_atime.tv_sec - get_seconds(); |
| 329 | if (delta < 0) |
| 330 | delta = -delta; |
| 331 | if (delta < MAX_TOUCH_TIME_ERROR && |
| 332 | inode_change_ok(inode, iap) != 0) { |
| 333 | /* |
| 334 | * Turn off ATTR_[AM]TIME_SET but leave ATTR_[AM]TIME. |
| 335 | * This will cause notify_change to set these times |
| 336 | * to "now" |
| 337 | */ |
| 338 | iap->ia_valid &= ~BOTH_TIME_SET; |
| 339 | } |
| 340 | } |
| 341 | |
| 342 | /* sanitize the mode change */ |
| 343 | if (iap->ia_valid & ATTR_MODE) { |
| 344 | iap->ia_mode &= S_IALLUGO; |
| 345 | iap->ia_mode |= (inode->i_mode & ~S_IALLUGO); |
| 346 | } |
| 347 | |
| 348 | /* Revoke setuid/setgid on chown */ |
| 349 | if (!S_ISDIR(inode->i_mode) && |
| 350 | (((iap->ia_valid & ATTR_UID) && iap->ia_uid != inode->i_uid) || |
| 351 | ((iap->ia_valid & ATTR_GID) && iap->ia_gid != inode->i_gid))) { |
| 352 | iap->ia_valid |= ATTR_KILL_PRIV; |
| 353 | if (iap->ia_valid & ATTR_MODE) { |
| 354 | /* we're setting mode too, just clear the s*id bits */ |
| 355 | iap->ia_mode &= ~S_ISUID; |
| 356 | if (iap->ia_mode & S_IXGRP) |
| 357 | iap->ia_mode &= ~S_ISGID; |
| 358 | } else { |
| 359 | /* set ATTR_KILL_* bits and let VFS handle it */ |
| 360 | iap->ia_valid |= (ATTR_KILL_SUID | ATTR_KILL_SGID); |
| 361 | } |
| 362 | } |
| 363 | } |
| 364 | |
| 365 | static __be32 |
| 366 | nfsd_get_write_access(struct svc_rqst *rqstp, struct svc_fh *fhp, |
| 367 | struct iattr *iap) |
| 368 | { |
| 369 | struct inode *inode = fhp->fh_dentry->d_inode; |
| 370 | int host_err; |
| 371 | |
| 372 | if (iap->ia_size < inode->i_size) { |
| 373 | __be32 err; |
| 374 | |
| 375 | err = nfsd_permission(rqstp, fhp->fh_export, fhp->fh_dentry, |
| 376 | NFSD_MAY_TRUNC | NFSD_MAY_OWNER_OVERRIDE); |
| 377 | if (err) |
| 378 | return err; |
| 379 | } |
| 380 | |
| 381 | host_err = get_write_access(inode); |
| 382 | if (host_err) |
| 383 | goto out_nfserrno; |
| 384 | |
| 385 | host_err = locks_verify_truncate(inode, NULL, iap->ia_size); |
| 386 | if (host_err) |
| 387 | goto out_put_write_access; |
| 388 | return 0; |
| 389 | |
| 390 | out_put_write_access: |
| 391 | put_write_access(inode); |
| 392 | out_nfserrno: |
| 393 | return nfserrno(host_err); |
| 394 | } |
| 395 | |
| 396 | /* |
| 397 | * Set various file attributes. After this call fhp needs an fh_put. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 398 | */ |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 399 | __be32 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 400 | nfsd_setattr(struct svc_rqst *rqstp, struct svc_fh *fhp, struct iattr *iap, |
| 401 | int check_guard, time_t guardtime) |
| 402 | { |
| 403 | struct dentry *dentry; |
| 404 | struct inode *inode; |
Miklos Szeredi | 8837abc | 2008-06-16 13:20:29 +0200 | [diff] [blame] | 405 | int accmode = NFSD_MAY_SATTR; |
Al Viro | 175a4eb | 2011-07-26 03:30:54 -0400 | [diff] [blame] | 406 | umode_t ftype = 0; |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 407 | __be32 err; |
| 408 | int host_err; |
J. Bruce Fields | 9c657e8 | 2014-02-24 14:59:47 -0500 | [diff] [blame] | 409 | bool get_write_count; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 410 | int size_change = 0; |
| 411 | |
| 412 | if (iap->ia_valid & (ATTR_ATIME | ATTR_MTIME | ATTR_SIZE)) |
Miklos Szeredi | 8837abc | 2008-06-16 13:20:29 +0200 | [diff] [blame] | 413 | accmode |= NFSD_MAY_WRITE|NFSD_MAY_OWNER_OVERRIDE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 414 | if (iap->ia_valid & ATTR_SIZE) |
| 415 | ftype = S_IFREG; |
| 416 | |
J. Bruce Fields | 9c657e8 | 2014-02-24 14:59:47 -0500 | [diff] [blame] | 417 | /* Callers that do fh_verify should do the fh_want_write: */ |
| 418 | get_write_count = !fhp->fh_dentry; |
| 419 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 420 | /* Get inode */ |
| 421 | err = fh_verify(rqstp, fhp, ftype, accmode); |
NeilBrown | 15b7a1b | 2005-11-07 01:00:23 -0800 | [diff] [blame] | 422 | if (err) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 423 | goto out; |
J. Bruce Fields | 9c657e8 | 2014-02-24 14:59:47 -0500 | [diff] [blame] | 424 | if (get_write_count) { |
| 425 | host_err = fh_want_write(fhp); |
| 426 | if (host_err) |
| 427 | return nfserrno(host_err); |
| 428 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 429 | |
| 430 | dentry = fhp->fh_dentry; |
| 431 | inode = dentry->d_inode; |
| 432 | |
NeilBrown | 15b7a1b | 2005-11-07 01:00:23 -0800 | [diff] [blame] | 433 | /* Ignore any mode updates on symlinks */ |
| 434 | if (S_ISLNK(inode->i_mode)) |
| 435 | iap->ia_valid &= ~ATTR_MODE; |
| 436 | |
| 437 | if (!iap->ia_valid) |
| 438 | goto out; |
| 439 | |
Christoph Hellwig | d51f76b | 2013-11-18 05:07:30 -0800 | [diff] [blame] | 440 | nfsd_sanitize_attrs(inode, iap); |
| 441 | |
Christoph Hellwig | 9c85fca | 2007-03-07 15:26:25 +0000 | [diff] [blame] | 442 | /* |
Christoph Hellwig | d51f76b | 2013-11-18 05:07:30 -0800 | [diff] [blame] | 443 | * The size case is special, it changes the file in addition to the |
| 444 | * attributes. |
Christoph Hellwig | 9c85fca | 2007-03-07 15:26:25 +0000 | [diff] [blame] | 445 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 446 | if (iap->ia_valid & ATTR_SIZE) { |
Christoph Hellwig | d51f76b | 2013-11-18 05:07:30 -0800 | [diff] [blame] | 447 | err = nfsd_get_write_access(rqstp, fhp, iap); |
| 448 | if (err) |
| 449 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 450 | size_change = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 451 | } |
| 452 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 453 | iap->ia_valid |= ATTR_CTIME; |
| 454 | |
Christoph Hellwig | db80ab7 | 2013-11-18 05:07:47 -0800 | [diff] [blame] | 455 | if (check_guard && guardtime != inode->i_ctime.tv_sec) { |
| 456 | err = nfserr_notsync; |
| 457 | goto out_put_write_access; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 458 | } |
Christoph Hellwig | db80ab7 | 2013-11-18 05:07:47 -0800 | [diff] [blame] | 459 | |
| 460 | host_err = nfsd_break_lease(inode); |
| 461 | if (host_err) |
| 462 | goto out_put_write_access_nfserror; |
| 463 | |
| 464 | fh_lock(fhp); |
| 465 | host_err = notify_change(dentry, iap); |
| 466 | fh_unlock(fhp); |
| 467 | |
| 468 | out_put_write_access_nfserror: |
| 469 | err = nfserrno(host_err); |
| 470 | out_put_write_access: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 471 | if (size_change) |
| 472 | put_write_access(inode); |
| 473 | if (!err) |
Christoph Hellwig | b160fda | 2010-06-01 21:59:18 +0200 | [diff] [blame] | 474 | commit_metadata(fhp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 475 | out: |
| 476 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 477 | } |
| 478 | |
Christoph Hellwig | 5be196e | 2006-01-09 20:51:55 -0800 | [diff] [blame] | 479 | #if defined(CONFIG_NFSD_V2_ACL) || \ |
| 480 | defined(CONFIG_NFSD_V3_ACL) || \ |
| 481 | defined(CONFIG_NFSD_V4) |
| 482 | static ssize_t nfsd_getxattr(struct dentry *dentry, char *key, void **buf) |
| 483 | { |
| 484 | ssize_t buflen; |
Krishna Kumar | 6c6a426 | 2008-10-22 14:48:36 +0530 | [diff] [blame] | 485 | ssize_t ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 486 | |
Christoph Hellwig | 5be196e | 2006-01-09 20:51:55 -0800 | [diff] [blame] | 487 | buflen = vfs_getxattr(dentry, key, NULL, 0); |
| 488 | if (buflen <= 0) |
| 489 | return buflen; |
| 490 | |
| 491 | *buf = kmalloc(buflen, GFP_KERNEL); |
| 492 | if (!*buf) |
| 493 | return -ENOMEM; |
| 494 | |
Krishna Kumar | 6c6a426 | 2008-10-22 14:48:36 +0530 | [diff] [blame] | 495 | ret = vfs_getxattr(dentry, key, *buf, buflen); |
| 496 | if (ret < 0) |
| 497 | kfree(*buf); |
| 498 | return ret; |
Christoph Hellwig | 5be196e | 2006-01-09 20:51:55 -0800 | [diff] [blame] | 499 | } |
| 500 | #endif |
| 501 | |
| 502 | #if defined(CONFIG_NFSD_V4) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 503 | static int |
| 504 | set_nfsv4_acl_one(struct dentry *dentry, struct posix_acl *pacl, char *key) |
| 505 | { |
| 506 | int len; |
| 507 | size_t buflen; |
| 508 | char *buf = NULL; |
| 509 | int error = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 510 | |
Sergio Gelato | fe8e578 | 2014-10-10 22:46:36 +0800 | [diff] [blame] | 511 | if (!pacl) |
| 512 | return vfs_setxattr(dentry, key, NULL, 0, 0); |
| 513 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 514 | buflen = posix_acl_xattr_size(pacl->a_count); |
| 515 | buf = kmalloc(buflen, GFP_KERNEL); |
| 516 | error = -ENOMEM; |
| 517 | if (buf == NULL) |
| 518 | goto out; |
| 519 | |
| 520 | len = posix_acl_to_xattr(pacl, buf, buflen); |
| 521 | if (len < 0) { |
| 522 | error = len; |
| 523 | goto out; |
| 524 | } |
| 525 | |
Christoph Hellwig | 5be196e | 2006-01-09 20:51:55 -0800 | [diff] [blame] | 526 | error = vfs_setxattr(dentry, key, buf, len, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 527 | out: |
| 528 | kfree(buf); |
| 529 | return error; |
| 530 | } |
| 531 | |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 532 | __be32 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 533 | nfsd4_set_nfs4_acl(struct svc_rqst *rqstp, struct svc_fh *fhp, |
| 534 | struct nfs4_acl *acl) |
| 535 | { |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 536 | __be32 error; |
| 537 | int host_error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 538 | struct dentry *dentry; |
| 539 | struct inode *inode; |
| 540 | struct posix_acl *pacl = NULL, *dpacl = NULL; |
| 541 | unsigned int flags = 0; |
| 542 | |
| 543 | /* Get inode */ |
J. Bruce Fields | e281d81 | 2011-08-15 16:57:07 -0400 | [diff] [blame] | 544 | error = fh_verify(rqstp, fhp, 0, NFSD_MAY_SATTR); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 545 | if (error) |
J. Bruce Fields | 4b2ca38 | 2007-07-17 04:04:37 -0700 | [diff] [blame] | 546 | return error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 547 | |
| 548 | dentry = fhp->fh_dentry; |
| 549 | inode = dentry->d_inode; |
| 550 | if (S_ISDIR(inode->i_mode)) |
| 551 | flags = NFS4_ACL_DIR; |
| 552 | |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 553 | host_error = nfs4_acl_nfsv4_to_posix(acl, &pacl, &dpacl, flags); |
| 554 | if (host_error == -EINVAL) { |
J. Bruce Fields | 4b2ca38 | 2007-07-17 04:04:37 -0700 | [diff] [blame] | 555 | return nfserr_attrnotsupp; |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 556 | } else if (host_error < 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 557 | goto out_nfserr; |
| 558 | |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 559 | host_error = set_nfsv4_acl_one(dentry, pacl, POSIX_ACL_XATTR_ACCESS); |
| 560 | if (host_error < 0) |
J. Bruce Fields | 4b2ca38 | 2007-07-17 04:04:37 -0700 | [diff] [blame] | 561 | goto out_release; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 562 | |
J. Bruce Fields | 4b2ca38 | 2007-07-17 04:04:37 -0700 | [diff] [blame] | 563 | if (S_ISDIR(inode->i_mode)) |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 564 | host_error = set_nfsv4_acl_one(dentry, dpacl, POSIX_ACL_XATTR_DEFAULT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 565 | |
J. Bruce Fields | 4b2ca38 | 2007-07-17 04:04:37 -0700 | [diff] [blame] | 566 | out_release: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 567 | posix_acl_release(pacl); |
| 568 | posix_acl_release(dpacl); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 569 | out_nfserr: |
J. Bruce Fields | f34f924 | 2007-02-16 01:28:34 -0800 | [diff] [blame] | 570 | if (host_error == -EOPNOTSUPP) |
J. Bruce Fields | 4b2ca38 | 2007-07-17 04:04:37 -0700 | [diff] [blame] | 571 | return nfserr_attrnotsupp; |
J. Bruce Fields | f34f924 | 2007-02-16 01:28:34 -0800 | [diff] [blame] | 572 | else |
J. Bruce Fields | 4b2ca38 | 2007-07-17 04:04:37 -0700 | [diff] [blame] | 573 | return nfserrno(host_error); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 574 | } |
| 575 | |
| 576 | static struct posix_acl * |
| 577 | _get_posix_acl(struct dentry *dentry, char *key) |
| 578 | { |
Christoph Hellwig | 5be196e | 2006-01-09 20:51:55 -0800 | [diff] [blame] | 579 | void *buf = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 580 | struct posix_acl *pacl = NULL; |
Christoph Hellwig | 5be196e | 2006-01-09 20:51:55 -0800 | [diff] [blame] | 581 | int buflen; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 582 | |
Christoph Hellwig | 5be196e | 2006-01-09 20:51:55 -0800 | [diff] [blame] | 583 | buflen = nfsd_getxattr(dentry, key, &buf); |
| 584 | if (!buflen) |
| 585 | buflen = -ENODATA; |
| 586 | if (buflen <= 0) |
| 587 | return ERR_PTR(buflen); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 588 | |
| 589 | pacl = posix_acl_from_xattr(buf, buflen); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 590 | kfree(buf); |
| 591 | return pacl; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 592 | } |
| 593 | |
| 594 | int |
| 595 | nfsd4_get_nfs4_acl(struct svc_rqst *rqstp, struct dentry *dentry, struct nfs4_acl **acl) |
| 596 | { |
| 597 | struct inode *inode = dentry->d_inode; |
| 598 | int error = 0; |
| 599 | struct posix_acl *pacl = NULL, *dpacl = NULL; |
| 600 | unsigned int flags = 0; |
| 601 | |
Christoph Hellwig | 9a59f45 | 2005-06-23 00:10:19 -0700 | [diff] [blame] | 602 | pacl = _get_posix_acl(dentry, POSIX_ACL_XATTR_ACCESS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 603 | if (IS_ERR(pacl) && PTR_ERR(pacl) == -ENODATA) |
| 604 | pacl = posix_acl_from_mode(inode->i_mode, GFP_KERNEL); |
| 605 | if (IS_ERR(pacl)) { |
| 606 | error = PTR_ERR(pacl); |
| 607 | pacl = NULL; |
| 608 | goto out; |
| 609 | } |
| 610 | |
| 611 | if (S_ISDIR(inode->i_mode)) { |
Christoph Hellwig | 9a59f45 | 2005-06-23 00:10:19 -0700 | [diff] [blame] | 612 | dpacl = _get_posix_acl(dentry, POSIX_ACL_XATTR_DEFAULT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 613 | if (IS_ERR(dpacl) && PTR_ERR(dpacl) == -ENODATA) |
| 614 | dpacl = NULL; |
| 615 | else if (IS_ERR(dpacl)) { |
| 616 | error = PTR_ERR(dpacl); |
| 617 | dpacl = NULL; |
| 618 | goto out; |
| 619 | } |
| 620 | flags = NFS4_ACL_DIR; |
| 621 | } |
| 622 | |
| 623 | *acl = nfs4_acl_posix_to_nfsv4(pacl, dpacl, flags); |
| 624 | if (IS_ERR(*acl)) { |
| 625 | error = PTR_ERR(*acl); |
| 626 | *acl = NULL; |
| 627 | } |
| 628 | out: |
| 629 | posix_acl_release(pacl); |
| 630 | posix_acl_release(dpacl); |
| 631 | return error; |
| 632 | } |
| 633 | |
Chuck Lever | 9b4146e | 2012-01-04 16:26:43 -0500 | [diff] [blame] | 634 | /* |
| 635 | * NFS junction information is stored in an extended attribute. |
| 636 | */ |
| 637 | #define NFSD_JUNCTION_XATTR_NAME XATTR_TRUSTED_PREFIX "junction.nfs" |
| 638 | |
| 639 | /** |
| 640 | * nfsd4_is_junction - Test if an object could be an NFS junction |
| 641 | * |
| 642 | * @dentry: object to test |
| 643 | * |
| 644 | * Returns 1 if "dentry" appears to contain NFS junction information. |
| 645 | * Otherwise 0 is returned. |
| 646 | */ |
Trond Myklebust | 11fcee0 | 2011-09-12 19:37:26 -0400 | [diff] [blame] | 647 | int nfsd4_is_junction(struct dentry *dentry) |
| 648 | { |
| 649 | struct inode *inode = dentry->d_inode; |
| 650 | |
| 651 | if (inode == NULL) |
| 652 | return 0; |
| 653 | if (inode->i_mode & S_IXUGO) |
| 654 | return 0; |
| 655 | if (!(inode->i_mode & S_ISVTX)) |
| 656 | return 0; |
Chuck Lever | 9b4146e | 2012-01-04 16:26:43 -0500 | [diff] [blame] | 657 | if (vfs_getxattr(dentry, NFSD_JUNCTION_XATTR_NAME, NULL, 0) <= 0) |
Trond Myklebust | 11fcee0 | 2011-09-12 19:37:26 -0400 | [diff] [blame] | 658 | return 0; |
| 659 | return 1; |
| 660 | } |
J. Bruce Fields | 6a85d6c | 2010-07-06 12:39:12 -0400 | [diff] [blame] | 661 | #endif /* defined(CONFIG_NFSD_V4) */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 662 | |
| 663 | #ifdef CONFIG_NFSD_V3 |
| 664 | /* |
| 665 | * Check server access rights to a file system object |
| 666 | */ |
| 667 | struct accessmap { |
| 668 | u32 access; |
| 669 | int how; |
| 670 | }; |
| 671 | static struct accessmap nfs3_regaccess[] = { |
Miklos Szeredi | 8837abc | 2008-06-16 13:20:29 +0200 | [diff] [blame] | 672 | { NFS3_ACCESS_READ, NFSD_MAY_READ }, |
| 673 | { NFS3_ACCESS_EXECUTE, NFSD_MAY_EXEC }, |
| 674 | { NFS3_ACCESS_MODIFY, NFSD_MAY_WRITE|NFSD_MAY_TRUNC }, |
| 675 | { NFS3_ACCESS_EXTEND, NFSD_MAY_WRITE }, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 676 | |
| 677 | { 0, 0 } |
| 678 | }; |
| 679 | |
| 680 | static struct accessmap nfs3_diraccess[] = { |
Miklos Szeredi | 8837abc | 2008-06-16 13:20:29 +0200 | [diff] [blame] | 681 | { NFS3_ACCESS_READ, NFSD_MAY_READ }, |
| 682 | { NFS3_ACCESS_LOOKUP, NFSD_MAY_EXEC }, |
| 683 | { NFS3_ACCESS_MODIFY, NFSD_MAY_EXEC|NFSD_MAY_WRITE|NFSD_MAY_TRUNC}, |
| 684 | { NFS3_ACCESS_EXTEND, NFSD_MAY_EXEC|NFSD_MAY_WRITE }, |
| 685 | { NFS3_ACCESS_DELETE, NFSD_MAY_REMOVE }, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 686 | |
| 687 | { 0, 0 } |
| 688 | }; |
| 689 | |
| 690 | static struct accessmap nfs3_anyaccess[] = { |
| 691 | /* Some clients - Solaris 2.6 at least, make an access call |
| 692 | * to the server to check for access for things like /dev/null |
| 693 | * (which really, the server doesn't care about). So |
| 694 | * We provide simple access checking for them, looking |
| 695 | * mainly at mode bits, and we make sure to ignore read-only |
| 696 | * filesystem checks |
| 697 | */ |
Miklos Szeredi | 8837abc | 2008-06-16 13:20:29 +0200 | [diff] [blame] | 698 | { NFS3_ACCESS_READ, NFSD_MAY_READ }, |
| 699 | { NFS3_ACCESS_EXECUTE, NFSD_MAY_EXEC }, |
| 700 | { NFS3_ACCESS_MODIFY, NFSD_MAY_WRITE|NFSD_MAY_LOCAL_ACCESS }, |
| 701 | { NFS3_ACCESS_EXTEND, NFSD_MAY_WRITE|NFSD_MAY_LOCAL_ACCESS }, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 702 | |
| 703 | { 0, 0 } |
| 704 | }; |
| 705 | |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 706 | __be32 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 707 | nfsd_access(struct svc_rqst *rqstp, struct svc_fh *fhp, u32 *access, u32 *supported) |
| 708 | { |
| 709 | struct accessmap *map; |
| 710 | struct svc_export *export; |
| 711 | struct dentry *dentry; |
| 712 | u32 query, result = 0, sresult = 0; |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 713 | __be32 error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 714 | |
Miklos Szeredi | 8837abc | 2008-06-16 13:20:29 +0200 | [diff] [blame] | 715 | error = fh_verify(rqstp, fhp, 0, NFSD_MAY_NOP); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 716 | if (error) |
| 717 | goto out; |
| 718 | |
| 719 | export = fhp->fh_export; |
| 720 | dentry = fhp->fh_dentry; |
| 721 | |
| 722 | if (S_ISREG(dentry->d_inode->i_mode)) |
| 723 | map = nfs3_regaccess; |
| 724 | else if (S_ISDIR(dentry->d_inode->i_mode)) |
| 725 | map = nfs3_diraccess; |
| 726 | else |
| 727 | map = nfs3_anyaccess; |
| 728 | |
| 729 | |
| 730 | query = *access; |
| 731 | for (; map->access; map++) { |
| 732 | if (map->access & query) { |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 733 | __be32 err2; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 734 | |
| 735 | sresult |= map->access; |
| 736 | |
J. Bruce Fields | 0ec757d | 2007-07-17 04:04:48 -0700 | [diff] [blame] | 737 | err2 = nfsd_permission(rqstp, export, dentry, map->how); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 738 | switch (err2) { |
| 739 | case nfs_ok: |
| 740 | result |= map->access; |
| 741 | break; |
| 742 | |
| 743 | /* the following error codes just mean the access was not allowed, |
| 744 | * rather than an error occurred */ |
| 745 | case nfserr_rofs: |
| 746 | case nfserr_acces: |
| 747 | case nfserr_perm: |
| 748 | /* simply don't "or" in the access bit. */ |
| 749 | break; |
| 750 | default: |
| 751 | error = err2; |
| 752 | goto out; |
| 753 | } |
| 754 | } |
| 755 | } |
| 756 | *access = result; |
| 757 | if (supported) |
| 758 | *supported = sresult; |
| 759 | |
| 760 | out: |
| 761 | return error; |
| 762 | } |
| 763 | #endif /* CONFIG_NFSD_V3 */ |
| 764 | |
J. Bruce Fields | 105f462 | 2011-06-07 11:50:23 -0400 | [diff] [blame] | 765 | static int nfsd_open_break_lease(struct inode *inode, int access) |
| 766 | { |
| 767 | unsigned int mode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 768 | |
J. Bruce Fields | 105f462 | 2011-06-07 11:50:23 -0400 | [diff] [blame] | 769 | if (access & NFSD_MAY_NOT_BREAK_LEASE) |
| 770 | return 0; |
| 771 | mode = (access & NFSD_MAY_WRITE) ? O_WRONLY : O_RDONLY; |
| 772 | return break_lease(inode, mode | O_NONBLOCK); |
| 773 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 774 | |
| 775 | /* |
| 776 | * Open an existing file or directory. |
Bernd Schubert | 999448a | 2012-03-18 22:44:49 -0400 | [diff] [blame] | 777 | * The may_flags argument indicates the type of open (read/write/lock) |
| 778 | * and additional flags. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 779 | * N.B. After this call fhp needs an fh_put |
| 780 | */ |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 781 | __be32 |
Al Viro | 175a4eb | 2011-07-26 03:30:54 -0400 | [diff] [blame] | 782 | 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] | 783 | int may_flags, struct file **filp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 784 | { |
| 785 | struct dentry *dentry; |
| 786 | struct inode *inode; |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 787 | int flags = O_RDONLY|O_LARGEFILE; |
| 788 | __be32 err; |
Jeff Layton | 9188525 | 2010-03-19 08:06:28 -0400 | [diff] [blame] | 789 | int host_err = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 790 | |
David Howells | e0e8173 | 2009-09-02 09:13:40 +0100 | [diff] [blame] | 791 | validate_process_creds(); |
| 792 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 793 | /* |
| 794 | * If we get here, then the client has already done an "open", |
| 795 | * and (hopefully) checked permission - so allow OWNER_OVERRIDE |
| 796 | * in case a chmod has now revoked permission. |
| 797 | */ |
Bernd Schubert | 999448a | 2012-03-18 22:44:49 -0400 | [diff] [blame] | 798 | err = fh_verify(rqstp, fhp, type, may_flags | NFSD_MAY_OWNER_OVERRIDE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 799 | if (err) |
| 800 | goto out; |
| 801 | |
| 802 | dentry = fhp->fh_dentry; |
| 803 | inode = dentry->d_inode; |
| 804 | |
| 805 | /* Disallow write access to files with the append-only bit set |
| 806 | * or any access when mandatory locking enabled |
| 807 | */ |
| 808 | err = nfserr_perm; |
Bernd Schubert | 999448a | 2012-03-18 22:44:49 -0400 | [diff] [blame] | 809 | if (IS_APPEND(inode) && (may_flags & NFSD_MAY_WRITE)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 810 | goto out; |
J. Bruce Fields | 5e7fc43 | 2007-10-02 14:18:12 -0400 | [diff] [blame] | 811 | /* |
| 812 | * We must ignore files (but only files) which might have mandatory |
| 813 | * locks on them because there is no way to know if the accesser has |
| 814 | * the lock. |
| 815 | */ |
| 816 | if (S_ISREG((inode)->i_mode) && mandatory_lock(inode)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 817 | goto out; |
| 818 | |
| 819 | if (!inode->i_fop) |
| 820 | goto out; |
| 821 | |
Bernd Schubert | 999448a | 2012-03-18 22:44:49 -0400 | [diff] [blame] | 822 | host_err = nfsd_open_break_lease(inode, may_flags); |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 823 | if (host_err) /* NOMEM or WOULDBLOCK */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 824 | goto out_nfserr; |
| 825 | |
Bernd Schubert | 999448a | 2012-03-18 22:44:49 -0400 | [diff] [blame] | 826 | if (may_flags & NFSD_MAY_WRITE) { |
| 827 | if (may_flags & NFSD_MAY_READ) |
J. Bruce Fields | 9ecb6a0 | 2006-06-30 01:56:17 -0700 | [diff] [blame] | 828 | flags = O_RDWR|O_LARGEFILE; |
| 829 | else |
| 830 | flags = O_WRONLY|O_LARGEFILE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 831 | } |
Jan Blunck | 5477549 | 2008-02-14 19:38:39 -0800 | [diff] [blame] | 832 | *filp = dentry_open(dget(dentry), mntget(fhp->fh_export->ex_path.mnt), |
David Howells | 033a666 | 2009-07-02 14:35:32 +0100 | [diff] [blame] | 833 | flags, current_cred()); |
Harshula Jayasuriya | f32094c | 2013-07-23 14:21:35 +1000 | [diff] [blame] | 834 | if (IS_ERR(*filp)) { |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 835 | host_err = PTR_ERR(*filp); |
Harshula Jayasuriya | f32094c | 2013-07-23 14:21:35 +1000 | [diff] [blame] | 836 | *filp = NULL; |
| 837 | } else { |
Bernd Schubert | 999448a | 2012-03-18 22:44:49 -0400 | [diff] [blame] | 838 | host_err = ima_file_check(*filp, may_flags); |
| 839 | |
Bernd Schubert | 06effdb | 2012-03-18 22:44:50 -0400 | [diff] [blame] | 840 | if (may_flags & NFSD_MAY_64BIT_COOKIE) |
| 841 | (*filp)->f_mode |= FMODE_64BITHASH; |
| 842 | else |
| 843 | (*filp)->f_mode |= FMODE_32BITHASH; |
| 844 | } |
| 845 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 846 | out_nfserr: |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 847 | err = nfserrno(host_err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 848 | out: |
David Howells | e0e8173 | 2009-09-02 09:13:40 +0100 | [diff] [blame] | 849 | validate_process_creds(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 850 | return err; |
| 851 | } |
| 852 | |
| 853 | /* |
| 854 | * Close a file. |
| 855 | */ |
| 856 | void |
| 857 | nfsd_close(struct file *filp) |
| 858 | { |
| 859 | fput(filp); |
| 860 | } |
| 861 | |
J. Bruce Fields | 9a8d248 | 2009-01-06 13:37:03 -0500 | [diff] [blame] | 862 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 863 | * Obtain the readahead parameters for the file |
| 864 | * specified by (dev, ino). |
| 865 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 866 | |
| 867 | static inline struct raparms * |
| 868 | nfsd_get_raparms(dev_t dev, ino_t ino) |
| 869 | { |
| 870 | struct raparms *ra, **rap, **frap = NULL; |
| 871 | int depth = 0; |
Greg Banks | fce1456 | 2006-10-04 02:15:49 -0700 | [diff] [blame] | 872 | unsigned int hash; |
| 873 | struct raparm_hbucket *rab; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 874 | |
Greg Banks | fce1456 | 2006-10-04 02:15:49 -0700 | [diff] [blame] | 875 | hash = jhash_2words(dev, ino, 0xfeedbeef) & RAPARM_HASH_MASK; |
| 876 | rab = &raparm_hash[hash]; |
| 877 | |
| 878 | spin_lock(&rab->pb_lock); |
| 879 | for (rap = &rab->pb_head; (ra = *rap); rap = &ra->p_next) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 880 | if (ra->p_ino == ino && ra->p_dev == dev) |
| 881 | goto found; |
| 882 | depth++; |
| 883 | if (ra->p_count == 0) |
| 884 | frap = rap; |
| 885 | } |
Konstantin Khorenko | 3aa6e0a | 2011-02-01 17:16:29 +0300 | [diff] [blame] | 886 | depth = nfsdstats.ra_size; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 887 | if (!frap) { |
Greg Banks | fce1456 | 2006-10-04 02:15:49 -0700 | [diff] [blame] | 888 | spin_unlock(&rab->pb_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 889 | return NULL; |
| 890 | } |
| 891 | rap = frap; |
| 892 | ra = *frap; |
| 893 | ra->p_dev = dev; |
| 894 | ra->p_ino = ino; |
| 895 | ra->p_set = 0; |
Greg Banks | fce1456 | 2006-10-04 02:15:49 -0700 | [diff] [blame] | 896 | ra->p_hindex = hash; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 897 | found: |
Greg Banks | fce1456 | 2006-10-04 02:15:49 -0700 | [diff] [blame] | 898 | if (rap != &rab->pb_head) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 899 | *rap = ra->p_next; |
Greg Banks | fce1456 | 2006-10-04 02:15:49 -0700 | [diff] [blame] | 900 | ra->p_next = rab->pb_head; |
| 901 | rab->pb_head = ra; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 902 | } |
| 903 | ra->p_count++; |
| 904 | nfsdstats.ra_depth[depth*10/nfsdstats.ra_size]++; |
Greg Banks | fce1456 | 2006-10-04 02:15:49 -0700 | [diff] [blame] | 905 | spin_unlock(&rab->pb_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 906 | return ra; |
| 907 | } |
| 908 | |
| 909 | /* |
Jens Axboe | cf8208d | 2007-06-12 21:22:14 +0200 | [diff] [blame] | 910 | * Grab and keep cached pages associated with a file in the svc_rqst |
| 911 | * so that they can be passed to the network sendmsg/sendpage routines |
| 912 | * directly. They will be released after the sending has completed. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 913 | */ |
| 914 | static int |
Jens Axboe | cf8208d | 2007-06-12 21:22:14 +0200 | [diff] [blame] | 915 | nfsd_splice_actor(struct pipe_inode_info *pipe, struct pipe_buffer *buf, |
| 916 | struct splice_desc *sd) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 917 | { |
Jens Axboe | cf8208d | 2007-06-12 21:22:14 +0200 | [diff] [blame] | 918 | struct svc_rqst *rqstp = sd->u.data; |
NeilBrown | 4452435 | 2006-10-04 02:15:46 -0700 | [diff] [blame] | 919 | struct page **pp = rqstp->rq_respages + rqstp->rq_resused; |
Jens Axboe | cf8208d | 2007-06-12 21:22:14 +0200 | [diff] [blame] | 920 | struct page *page = buf->page; |
| 921 | size_t size; |
Jens Axboe | cf8208d | 2007-06-12 21:22:14 +0200 | [diff] [blame] | 922 | |
| 923 | size = sd->len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 924 | |
| 925 | if (rqstp->rq_res.page_len == 0) { |
| 926 | get_page(page); |
NeilBrown | 4452435 | 2006-10-04 02:15:46 -0700 | [diff] [blame] | 927 | put_page(*pp); |
| 928 | *pp = page; |
| 929 | rqstp->rq_resused++; |
Jens Axboe | cf8208d | 2007-06-12 21:22:14 +0200 | [diff] [blame] | 930 | rqstp->rq_res.page_base = buf->offset; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 931 | rqstp->rq_res.page_len = size; |
NeilBrown | 4452435 | 2006-10-04 02:15:46 -0700 | [diff] [blame] | 932 | } else if (page != pp[-1]) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 933 | get_page(page); |
NeilBrown | 250f391 | 2007-01-26 00:56:59 -0800 | [diff] [blame] | 934 | if (*pp) |
| 935 | put_page(*pp); |
NeilBrown | 4452435 | 2006-10-04 02:15:46 -0700 | [diff] [blame] | 936 | *pp = page; |
| 937 | rqstp->rq_resused++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 938 | rqstp->rq_res.page_len += size; |
NeilBrown | 4452435 | 2006-10-04 02:15:46 -0700 | [diff] [blame] | 939 | } else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 940 | rqstp->rq_res.page_len += size; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 941 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 942 | return size; |
| 943 | } |
| 944 | |
Jens Axboe | cf8208d | 2007-06-12 21:22:14 +0200 | [diff] [blame] | 945 | static int nfsd_direct_splice_actor(struct pipe_inode_info *pipe, |
| 946 | struct splice_desc *sd) |
| 947 | { |
| 948 | return __splice_from_pipe(pipe, sd, nfsd_splice_actor); |
| 949 | } |
| 950 | |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 951 | static __be32 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 952 | nfsd_vfs_read(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file, |
| 953 | loff_t offset, struct kvec *vec, int vlen, unsigned long *count) |
| 954 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 955 | mm_segment_t oldfs; |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 956 | __be32 err; |
| 957 | int host_err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 958 | |
| 959 | err = nfserr_perm; |
Dave Hansen | a8754be | 2007-10-16 23:31:15 -0700 | [diff] [blame] | 960 | |
Jens Axboe | cf8208d | 2007-06-12 21:22:14 +0200 | [diff] [blame] | 961 | if (file->f_op->splice_read && rqstp->rq_splice_ok) { |
| 962 | struct splice_desc sd = { |
| 963 | .len = 0, |
| 964 | .total_len = *count, |
| 965 | .pos = offset, |
| 966 | .u.data = rqstp, |
| 967 | }; |
| 968 | |
Jens Axboe | 4fbef20 | 2007-07-13 22:42:20 +0200 | [diff] [blame] | 969 | rqstp->rq_resused = 1; |
Jens Axboe | cf8208d | 2007-06-12 21:22:14 +0200 | [diff] [blame] | 970 | host_err = splice_direct_to_actor(file, &sd, nfsd_direct_splice_actor); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 971 | } else { |
| 972 | oldfs = get_fs(); |
| 973 | set_fs(KERNEL_DS); |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 974 | host_err = vfs_readv(file, (struct iovec __user *)vec, vlen, &offset); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 975 | set_fs(oldfs); |
| 976 | } |
| 977 | |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 978 | if (host_err >= 0) { |
| 979 | nfsdstats.io_read += host_err; |
| 980 | *count = host_err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 981 | err = 0; |
Eric Paris | 2a12a9d | 2009-12-17 21:24:21 -0500 | [diff] [blame] | 982 | fsnotify_access(file); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 983 | } else |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 984 | err = nfserrno(host_err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 985 | return err; |
| 986 | } |
| 987 | |
Neil Brown | 9f708e4 | 2006-01-06 00:19:59 -0800 | [diff] [blame] | 988 | static void kill_suid(struct dentry *dentry) |
| 989 | { |
| 990 | struct iattr ia; |
Serge E. Hallyn | b537677 | 2007-10-16 23:31:36 -0700 | [diff] [blame] | 991 | ia.ia_valid = ATTR_KILL_SUID | ATTR_KILL_SGID | ATTR_KILL_PRIV; |
Neil Brown | 9f708e4 | 2006-01-06 00:19:59 -0800 | [diff] [blame] | 992 | |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 993 | mutex_lock(&dentry->d_inode->i_mutex); |
Neil Brown | 9f708e4 | 2006-01-06 00:19:59 -0800 | [diff] [blame] | 994 | notify_change(dentry, &ia); |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 995 | mutex_unlock(&dentry->d_inode->i_mutex); |
Neil Brown | 9f708e4 | 2006-01-06 00:19:59 -0800 | [diff] [blame] | 996 | } |
| 997 | |
J. Bruce Fields | d911df7 | 2009-06-15 16:03:53 -0700 | [diff] [blame] | 998 | /* |
| 999 | * Gathered writes: If another process is currently writing to the file, |
| 1000 | * there's a high chance this is another nfsd (triggered by a bulk write |
| 1001 | * from a client's biod). Rather than syncing the file with each write |
| 1002 | * request, we sleep for 10 msec. |
| 1003 | * |
| 1004 | * I don't know if this roughly approximates C. Juszak's idea of |
| 1005 | * gathered writes, but it's a nice and simple solution (IMHO), and it |
| 1006 | * seems to work:-) |
| 1007 | * |
| 1008 | * Note: we do this only in the NFSv2 case, since v3 and higher have a |
| 1009 | * better tool (separate unstable writes and commits) for solving this |
| 1010 | * problem. |
| 1011 | */ |
| 1012 | static int wait_for_concurrent_writes(struct file *file) |
| 1013 | { |
| 1014 | struct inode *inode = file->f_path.dentry->d_inode; |
| 1015 | static ino_t last_ino; |
| 1016 | static dev_t last_dev; |
| 1017 | int err = 0; |
| 1018 | |
| 1019 | if (atomic_read(&inode->i_writecount) > 1 |
| 1020 | || (last_ino == inode->i_ino && last_dev == inode->i_sb->s_dev)) { |
| 1021 | dprintk("nfsd: write defer %d\n", task_pid_nr(current)); |
| 1022 | msleep(10); |
| 1023 | dprintk("nfsd: write resume %d\n", task_pid_nr(current)); |
| 1024 | } |
| 1025 | |
| 1026 | if (inode->i_state & I_DIRTY) { |
| 1027 | dprintk("nfsd: write sync %d\n", task_pid_nr(current)); |
Christoph Hellwig | 8018ab0 | 2010-03-22 17:32:25 +0100 | [diff] [blame] | 1028 | err = vfs_fsync(file, 0); |
J. Bruce Fields | d911df7 | 2009-06-15 16:03:53 -0700 | [diff] [blame] | 1029 | } |
| 1030 | last_ino = inode->i_ino; |
| 1031 | last_dev = inode->i_sb->s_dev; |
| 1032 | return err; |
| 1033 | } |
| 1034 | |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1035 | static __be32 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1036 | nfsd_vfs_write(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file, |
| 1037 | loff_t offset, struct kvec *vec, int vlen, |
David Shaw | 31dec25 | 2009-03-05 20:16:14 -0500 | [diff] [blame] | 1038 | unsigned long *cnt, int *stablep) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1039 | { |
| 1040 | struct svc_export *exp; |
| 1041 | struct dentry *dentry; |
| 1042 | struct inode *inode; |
| 1043 | mm_segment_t oldfs; |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1044 | __be32 err = 0; |
| 1045 | int host_err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1046 | int stable = *stablep; |
Trond Myklebust | 48e03bc | 2009-06-05 12:35:15 -0400 | [diff] [blame] | 1047 | int use_wgather; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1048 | |
Josef "Jeff" Sipek | 7eaa36e | 2006-12-08 02:36:41 -0800 | [diff] [blame] | 1049 | dentry = file->f_path.dentry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1050 | inode = dentry->d_inode; |
| 1051 | exp = fhp->fh_export; |
| 1052 | |
| 1053 | /* |
| 1054 | * Request sync writes if |
| 1055 | * - the sync export option has been set, or |
| 1056 | * - the client requested O_SYNC behavior (NFSv3 feature). |
| 1057 | * - The file system doesn't support fsync(). |
Trond Myklebust | 48e03bc | 2009-06-05 12:35:15 -0400 | [diff] [blame] | 1058 | * When NFSv2 gathered writes have been configured for this volume, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1059 | * flushing the data to disk is handled separately below. |
| 1060 | */ |
Trond Myklebust | 48e03bc | 2009-06-05 12:35:15 -0400 | [diff] [blame] | 1061 | use_wgather = (rqstp->rq_vers == 2) && EX_WGATHER(exp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1062 | |
Harvey Harrison | 3ba1514 | 2008-02-20 12:49:02 -0800 | [diff] [blame] | 1063 | if (!file->f_op->fsync) {/* COMMIT3 cannot work */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1064 | stable = 2; |
| 1065 | *stablep = 2; /* FILE_SYNC */ |
| 1066 | } |
| 1067 | |
| 1068 | if (!EX_ISSYNC(exp)) |
| 1069 | stable = 0; |
Trond Myklebust | 48e03bc | 2009-06-05 12:35:15 -0400 | [diff] [blame] | 1070 | if (stable && !use_wgather) { |
Jonathan Corbet | db1dd4d | 2009-02-06 15:25:24 -0700 | [diff] [blame] | 1071 | spin_lock(&file->f_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1072 | file->f_flags |= O_SYNC; |
Jonathan Corbet | db1dd4d | 2009-02-06 15:25:24 -0700 | [diff] [blame] | 1073 | spin_unlock(&file->f_lock); |
| 1074 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1075 | |
| 1076 | /* Write the data. */ |
| 1077 | oldfs = get_fs(); set_fs(KERNEL_DS); |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1078 | host_err = vfs_writev(file, (struct iovec __user *)vec, vlen, &offset); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1079 | set_fs(oldfs); |
J. Bruce Fields | e4636d5 | 2009-06-15 19:07:13 -0700 | [diff] [blame] | 1080 | if (host_err < 0) |
| 1081 | goto out_nfserr; |
| 1082 | *cnt = host_err; |
| 1083 | nfsdstats.io_write += host_err; |
Eric Paris | 2a12a9d | 2009-12-17 21:24:21 -0500 | [diff] [blame] | 1084 | fsnotify_modify(file); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1085 | |
| 1086 | /* clear setuid/setgid flag after write */ |
J. Bruce Fields | e4636d5 | 2009-06-15 19:07:13 -0700 | [diff] [blame] | 1087 | if (inode->i_mode & (S_ISUID | S_ISGID)) |
Neil Brown | 9f708e4 | 2006-01-06 00:19:59 -0800 | [diff] [blame] | 1088 | kill_suid(dentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1089 | |
J. Bruce Fields | e4636d5 | 2009-06-15 19:07:13 -0700 | [diff] [blame] | 1090 | if (stable && use_wgather) |
J. Bruce Fields | d911df7 | 2009-06-15 16:03:53 -0700 | [diff] [blame] | 1091 | host_err = wait_for_concurrent_writes(file); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1092 | |
J. Bruce Fields | e4636d5 | 2009-06-15 19:07:13 -0700 | [diff] [blame] | 1093 | out_nfserr: |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1094 | dprintk("nfsd: write complete host_err=%d\n", host_err); |
Wei Yongjun | a0d24b2 | 2009-05-19 12:03:15 +0800 | [diff] [blame] | 1095 | if (host_err >= 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1096 | err = 0; |
Wei Yongjun | a0d24b2 | 2009-05-19 12:03:15 +0800 | [diff] [blame] | 1097 | else |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1098 | err = nfserrno(host_err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1099 | return err; |
| 1100 | } |
| 1101 | |
| 1102 | /* |
| 1103 | * Read data from a file. count must contain the requested read count |
| 1104 | * on entry. On return, *count contains the number of bytes actually read. |
| 1105 | * N.B. After this call fhp needs an fh_put |
| 1106 | */ |
J. Bruce Fields | 039a87c | 2010-07-30 11:33:32 -0400 | [diff] [blame] | 1107 | __be32 nfsd_read(struct svc_rqst *rqstp, struct svc_fh *fhp, |
J. Bruce Fields | fa0a212 | 2010-07-27 16:48:54 -0400 | [diff] [blame] | 1108 | loff_t offset, struct kvec *vec, int vlen, unsigned long *count) |
| 1109 | { |
| 1110 | struct file *file; |
| 1111 | struct inode *inode; |
| 1112 | struct raparms *ra; |
| 1113 | __be32 err; |
| 1114 | |
| 1115 | err = nfsd_open(rqstp, fhp, S_IFREG, NFSD_MAY_READ, &file); |
| 1116 | if (err) |
| 1117 | return err; |
| 1118 | |
| 1119 | inode = file->f_path.dentry->d_inode; |
| 1120 | |
| 1121 | /* Get readahead parameters */ |
| 1122 | ra = nfsd_get_raparms(inode->i_sb->s_dev, inode->i_ino); |
| 1123 | |
| 1124 | if (ra && ra->p_set) |
| 1125 | file->f_ra = ra->p_ra; |
| 1126 | |
| 1127 | err = nfsd_vfs_read(rqstp, fhp, file, offset, vec, vlen, count); |
| 1128 | |
| 1129 | /* Write back readahead params */ |
| 1130 | if (ra) { |
| 1131 | struct raparm_hbucket *rab = &raparm_hash[ra->p_hindex]; |
| 1132 | spin_lock(&rab->pb_lock); |
| 1133 | ra->p_ra = file->f_ra; |
| 1134 | ra->p_set = 1; |
| 1135 | ra->p_count--; |
| 1136 | spin_unlock(&rab->pb_lock); |
| 1137 | } |
| 1138 | |
| 1139 | nfsd_close(file); |
| 1140 | return err; |
| 1141 | } |
| 1142 | |
J. Bruce Fields | 039a87c | 2010-07-30 11:33:32 -0400 | [diff] [blame] | 1143 | /* As above, but use the provided file descriptor. */ |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1144 | __be32 |
J. Bruce Fields | 039a87c | 2010-07-30 11:33:32 -0400 | [diff] [blame] | 1145 | 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] | 1146 | loff_t offset, struct kvec *vec, int vlen, |
| 1147 | unsigned long *count) |
| 1148 | { |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1149 | __be32 err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1150 | |
| 1151 | if (file) { |
J. Bruce Fields | 0ec757d | 2007-07-17 04:04:48 -0700 | [diff] [blame] | 1152 | err = nfsd_permission(rqstp, fhp->fh_export, fhp->fh_dentry, |
Miklos Szeredi | 8837abc | 2008-06-16 13:20:29 +0200 | [diff] [blame] | 1153 | NFSD_MAY_READ|NFSD_MAY_OWNER_OVERRIDE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1154 | if (err) |
| 1155 | goto out; |
| 1156 | err = nfsd_vfs_read(rqstp, fhp, file, offset, vec, vlen, count); |
J. Bruce Fields | 039a87c | 2010-07-30 11:33:32 -0400 | [diff] [blame] | 1157 | } else /* Note file may still be NULL in NFSv4 special stateid case: */ |
| 1158 | err = nfsd_read(rqstp, fhp, offset, vec, vlen, count); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1159 | out: |
| 1160 | return err; |
| 1161 | } |
| 1162 | |
| 1163 | /* |
| 1164 | * Write data to a file. |
| 1165 | * The stable flag requests synchronous writes. |
| 1166 | * N.B. After this call fhp needs an fh_put |
| 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_write(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file, |
David Shaw | 31dec25 | 2009-03-05 20:16:14 -0500 | [diff] [blame] | 1170 | loff_t offset, struct kvec *vec, int vlen, unsigned long *cnt, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1171 | int *stablep) |
| 1172 | { |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1173 | __be32 err = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1174 | |
| 1175 | if (file) { |
J. Bruce Fields | 0ec757d | 2007-07-17 04:04:48 -0700 | [diff] [blame] | 1176 | err = nfsd_permission(rqstp, fhp->fh_export, fhp->fh_dentry, |
Miklos Szeredi | 8837abc | 2008-06-16 13:20:29 +0200 | [diff] [blame] | 1177 | NFSD_MAY_WRITE|NFSD_MAY_OWNER_OVERRIDE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1178 | if (err) |
| 1179 | goto out; |
| 1180 | err = nfsd_vfs_write(rqstp, fhp, file, offset, vec, vlen, cnt, |
| 1181 | stablep); |
| 1182 | } else { |
Miklos Szeredi | 8837abc | 2008-06-16 13:20:29 +0200 | [diff] [blame] | 1183 | err = nfsd_open(rqstp, fhp, S_IFREG, NFSD_MAY_WRITE, &file); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1184 | if (err) |
| 1185 | goto out; |
| 1186 | |
| 1187 | if (cnt) |
| 1188 | err = nfsd_vfs_write(rqstp, fhp, file, offset, vec, vlen, |
| 1189 | cnt, stablep); |
| 1190 | nfsd_close(file); |
| 1191 | } |
| 1192 | out: |
| 1193 | return err; |
| 1194 | } |
| 1195 | |
| 1196 | #ifdef CONFIG_NFSD_V3 |
| 1197 | /* |
| 1198 | * Commit all pending writes to stable storage. |
Trond Myklebust | aa696a6 | 2010-01-29 16:44:25 -0500 | [diff] [blame] | 1199 | * |
| 1200 | * Note: we only guarantee that data that lies within the range specified |
| 1201 | * by the 'offset' and 'count' parameters will be synced. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1202 | * |
| 1203 | * Unfortunately we cannot lock the file to make sure we return full WCC |
| 1204 | * data to the client, as locking happens lower down in the filesystem. |
| 1205 | */ |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1206 | __be32 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1207 | nfsd_commit(struct svc_rqst *rqstp, struct svc_fh *fhp, |
| 1208 | loff_t offset, unsigned long count) |
| 1209 | { |
| 1210 | struct file *file; |
Trond Myklebust | aa696a6 | 2010-01-29 16:44:25 -0500 | [diff] [blame] | 1211 | loff_t end = LLONG_MAX; |
| 1212 | __be32 err = nfserr_inval; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1213 | |
Trond Myklebust | aa696a6 | 2010-01-29 16:44:25 -0500 | [diff] [blame] | 1214 | if (offset < 0) |
| 1215 | goto out; |
| 1216 | if (count != 0) { |
| 1217 | end = offset + (loff_t)count - 1; |
| 1218 | if (end < offset) |
| 1219 | goto out; |
| 1220 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1221 | |
Jeff Layton | 9188525 | 2010-03-19 08:06:28 -0400 | [diff] [blame] | 1222 | err = nfsd_open(rqstp, fhp, S_IFREG, |
| 1223 | NFSD_MAY_WRITE|NFSD_MAY_NOT_BREAK_LEASE, &file); |
Miklos Szeredi | 8837abc | 2008-06-16 13:20:29 +0200 | [diff] [blame] | 1224 | if (err) |
Trond Myklebust | aa696a6 | 2010-01-29 16:44:25 -0500 | [diff] [blame] | 1225 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1226 | if (EX_ISSYNC(fhp->fh_export)) { |
Christoph Hellwig | 8018ab0 | 2010-03-22 17:32:25 +0100 | [diff] [blame] | 1227 | int err2 = vfs_fsync_range(file, offset, end, 0); |
Trond Myklebust | aa696a6 | 2010-01-29 16:44:25 -0500 | [diff] [blame] | 1228 | |
| 1229 | if (err2 != -EINVAL) |
| 1230 | err = nfserrno(err2); |
| 1231 | else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1232 | err = nfserr_notsupp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1233 | } |
| 1234 | |
| 1235 | nfsd_close(file); |
Trond Myklebust | aa696a6 | 2010-01-29 16:44:25 -0500 | [diff] [blame] | 1236 | out: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1237 | return err; |
| 1238 | } |
| 1239 | #endif /* CONFIG_NFSD_V3 */ |
| 1240 | |
Adrian Bunk | f2b0dee | 2008-02-13 23:30:26 +0200 | [diff] [blame] | 1241 | static __be32 |
J. Bruce Fields | 5c002b3 | 2007-11-30 16:55:23 -0500 | [diff] [blame] | 1242 | nfsd_create_setattr(struct svc_rqst *rqstp, struct svc_fh *resfhp, |
| 1243 | struct iattr *iap) |
| 1244 | { |
| 1245 | /* |
| 1246 | * Mode has already been set earlier in create: |
| 1247 | */ |
| 1248 | iap->ia_valid &= ~ATTR_MODE; |
| 1249 | /* |
| 1250 | * Setting uid/gid works only for root. Irix appears to |
| 1251 | * send along the gid on create when it tries to implement |
| 1252 | * setgid directories via NFS: |
| 1253 | */ |
David Howells | 5cc0a84 | 2008-11-14 10:38:58 +1100 | [diff] [blame] | 1254 | if (current_fsuid() != 0) |
J. Bruce Fields | 5c002b3 | 2007-11-30 16:55:23 -0500 | [diff] [blame] | 1255 | iap->ia_valid &= ~(ATTR_UID|ATTR_GID); |
| 1256 | if (iap->ia_valid) |
| 1257 | return nfsd_setattr(rqstp, resfhp, iap, 0, (time_t)0); |
| 1258 | return 0; |
| 1259 | } |
| 1260 | |
wengang wang | 4ac35c2 | 2009-02-10 11:27:51 +0800 | [diff] [blame] | 1261 | /* HPUX client sometimes creates a file in mode 000, and sets size to 0. |
| 1262 | * setting size to 0 may fail for some specific file systems by the permission |
| 1263 | * checking which requires WRITE permission but the mode is 000. |
| 1264 | * we ignore the resizing(to 0) on the just new created file, since the size is |
| 1265 | * 0 after file created. |
| 1266 | * |
| 1267 | * call this only after vfs_create() is called. |
| 1268 | * */ |
| 1269 | static void |
| 1270 | nfsd_check_ignore_resizing(struct iattr *iap) |
| 1271 | { |
| 1272 | if ((iap->ia_valid & ATTR_SIZE) && (iap->ia_size == 0)) |
| 1273 | iap->ia_valid &= ~ATTR_SIZE; |
| 1274 | } |
| 1275 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1276 | /* |
| 1277 | * Create a file (regular, directory, device, fifo); UNIX sockets |
| 1278 | * not yet implemented. |
| 1279 | * If the response fh has been verified, the parent directory should |
| 1280 | * already be locked. Note that the parent directory is left locked. |
| 1281 | * |
| 1282 | * N.B. Every call to nfsd_create needs an fh_put for _both_ fhp and resfhp |
| 1283 | */ |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1284 | __be32 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1285 | nfsd_create(struct svc_rqst *rqstp, struct svc_fh *fhp, |
| 1286 | char *fname, int flen, struct iattr *iap, |
| 1287 | int type, dev_t rdev, struct svc_fh *resfhp) |
| 1288 | { |
| 1289 | struct dentry *dentry, *dchild = NULL; |
| 1290 | struct inode *dirp; |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1291 | __be32 err; |
J. Bruce Fields | 5c002b3 | 2007-11-30 16:55:23 -0500 | [diff] [blame] | 1292 | __be32 err2; |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1293 | int host_err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1294 | |
| 1295 | err = nfserr_perm; |
| 1296 | if (!flen) |
| 1297 | goto out; |
| 1298 | err = nfserr_exist; |
| 1299 | if (isdotent(fname, flen)) |
| 1300 | goto out; |
| 1301 | |
Miklos Szeredi | 8837abc | 2008-06-16 13:20:29 +0200 | [diff] [blame] | 1302 | err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_CREATE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1303 | if (err) |
| 1304 | goto out; |
| 1305 | |
| 1306 | dentry = fhp->fh_dentry; |
| 1307 | dirp = dentry->d_inode; |
| 1308 | |
| 1309 | err = nfserr_notdir; |
Al Viro | acfa438 | 2008-12-04 10:06:33 -0500 | [diff] [blame] | 1310 | if (!dirp->i_op->lookup) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1311 | goto out; |
| 1312 | /* |
| 1313 | * Check whether the response file handle has been verified yet. |
| 1314 | * If it has, the parent directory should already be locked. |
| 1315 | */ |
| 1316 | if (!resfhp->fh_dentry) { |
| 1317 | /* called from nfsd_proc_mkdir, or possibly nfsd3_proc_create */ |
Peter Zijlstra | 12fd352 | 2006-10-02 02:18:03 -0700 | [diff] [blame] | 1318 | fh_lock_nested(fhp, I_MUTEX_PARENT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1319 | dchild = lookup_one_len(fname, dentry, flen); |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1320 | host_err = PTR_ERR(dchild); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1321 | if (IS_ERR(dchild)) |
| 1322 | goto out_nfserr; |
| 1323 | err = fh_compose(resfhp, fhp->fh_export, dchild, fhp); |
| 1324 | if (err) |
| 1325 | goto out; |
| 1326 | } else { |
| 1327 | /* called from nfsd_proc_create */ |
| 1328 | dchild = dget(resfhp->fh_dentry); |
| 1329 | if (!fhp->fh_locked) { |
| 1330 | /* not actually possible */ |
| 1331 | printk(KERN_ERR |
| 1332 | "nfsd_create: parent %s/%s not locked!\n", |
| 1333 | dentry->d_parent->d_name.name, |
| 1334 | dentry->d_name.name); |
Al Viro | d75f2b9 | 2006-01-18 17:43:44 -0800 | [diff] [blame] | 1335 | err = nfserr_io; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1336 | goto out; |
| 1337 | } |
| 1338 | } |
| 1339 | /* |
| 1340 | * Make sure the child dentry is still negative ... |
| 1341 | */ |
| 1342 | err = nfserr_exist; |
| 1343 | if (dchild->d_inode) { |
| 1344 | dprintk("nfsd_create: dentry %s/%s not negative!\n", |
| 1345 | dentry->d_name.name, dchild->d_name.name); |
| 1346 | goto out; |
| 1347 | } |
| 1348 | |
| 1349 | if (!(iap->ia_valid & ATTR_MODE)) |
| 1350 | iap->ia_mode = 0; |
| 1351 | iap->ia_mode = (iap->ia_mode & S_IALLUGO) | type; |
| 1352 | |
Miklos Szeredi | 07cad1d | 2008-07-01 15:38:35 +0200 | [diff] [blame] | 1353 | err = nfserr_inval; |
| 1354 | if (!S_ISREG(type) && !S_ISDIR(type) && !special_file(type)) { |
| 1355 | printk(KERN_WARNING "nfsd: bad file type %o in nfsd_create\n", |
| 1356 | type); |
| 1357 | goto out; |
| 1358 | } |
| 1359 | |
Al Viro | bad0dcf | 2011-11-23 12:03:18 -0500 | [diff] [blame] | 1360 | host_err = fh_want_write(fhp); |
Miklos Szeredi | 07cad1d | 2008-07-01 15:38:35 +0200 | [diff] [blame] | 1361 | if (host_err) |
| 1362 | goto out_nfserr; |
| 1363 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1364 | /* |
| 1365 | * Get the dir op function pointer. |
| 1366 | */ |
J. Bruce Fields | 088406b | 2006-11-08 17:44:59 -0800 | [diff] [blame] | 1367 | err = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1368 | switch (type) { |
| 1369 | case S_IFREG: |
Al Viro | 8da0eaf | 2012-06-10 18:09:36 -0400 | [diff] [blame] | 1370 | host_err = vfs_create(dirp, dchild, iap->ia_mode, true); |
wengang wang | 4ac35c2 | 2009-02-10 11:27:51 +0800 | [diff] [blame] | 1371 | if (!host_err) |
| 1372 | nfsd_check_ignore_resizing(iap); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1373 | break; |
| 1374 | case S_IFDIR: |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1375 | host_err = vfs_mkdir(dirp, dchild, iap->ia_mode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1376 | break; |
| 1377 | case S_IFCHR: |
| 1378 | case S_IFBLK: |
| 1379 | case S_IFIFO: |
| 1380 | case S_IFSOCK: |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1381 | host_err = vfs_mknod(dirp, dchild, iap->ia_mode, rdev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1382 | break; |
Dave Hansen | 463c319 | 2008-02-15 14:37:57 -0800 | [diff] [blame] | 1383 | } |
| 1384 | if (host_err < 0) { |
Al Viro | bad0dcf | 2011-11-23 12:03:18 -0500 | [diff] [blame] | 1385 | fh_drop_write(fhp); |
Dave Hansen | 463c319 | 2008-02-15 14:37:57 -0800 | [diff] [blame] | 1386 | goto out_nfserr; |
| 1387 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1388 | |
Ben Myers | f501912 | 2010-02-17 14:05:11 -0600 | [diff] [blame] | 1389 | err = nfsd_create_setattr(rqstp, resfhp, iap); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1390 | |
Ben Myers | f501912 | 2010-02-17 14:05:11 -0600 | [diff] [blame] | 1391 | /* |
| 1392 | * nfsd_setattr already committed the child. Transactional filesystems |
| 1393 | * had a chance to commit changes for both parent and child |
| 1394 | * simultaneously making the following commit_metadata a noop. |
| 1395 | */ |
| 1396 | err2 = nfserrno(commit_metadata(fhp)); |
J. Bruce Fields | 5c002b3 | 2007-11-30 16:55:23 -0500 | [diff] [blame] | 1397 | if (err2) |
| 1398 | err = err2; |
Al Viro | bad0dcf | 2011-11-23 12:03:18 -0500 | [diff] [blame] | 1399 | fh_drop_write(fhp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1400 | /* |
| 1401 | * Update the file handle to get the new inode info. |
| 1402 | */ |
| 1403 | if (!err) |
| 1404 | err = fh_update(resfhp); |
| 1405 | out: |
| 1406 | if (dchild && !IS_ERR(dchild)) |
| 1407 | dput(dchild); |
| 1408 | return err; |
| 1409 | |
| 1410 | out_nfserr: |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1411 | err = nfserrno(host_err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1412 | goto out; |
| 1413 | } |
| 1414 | |
| 1415 | #ifdef CONFIG_NFSD_V3 |
Mi Jinlong | ac6721a | 2011-04-20 17:06:25 +0800 | [diff] [blame] | 1416 | |
| 1417 | static inline int nfsd_create_is_exclusive(int createmode) |
| 1418 | { |
| 1419 | return createmode == NFS3_CREATE_EXCLUSIVE |
| 1420 | || createmode == NFS4_CREATE_EXCLUSIVE4_1; |
| 1421 | } |
| 1422 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1423 | /* |
Mi Jinlong | ac6721a | 2011-04-20 17:06:25 +0800 | [diff] [blame] | 1424 | * NFSv3 and NFSv4 version of nfsd_create |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1425 | */ |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1426 | __be32 |
Mi Jinlong | ac6721a | 2011-04-20 17:06:25 +0800 | [diff] [blame] | 1427 | do_nfsd_create(struct svc_rqst *rqstp, struct svc_fh *fhp, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1428 | char *fname, int flen, struct iattr *iap, |
| 1429 | struct svc_fh *resfhp, int createmode, u32 *verifier, |
J. Bruce Fields | 856121b | 2011-10-13 11:37:11 -0400 | [diff] [blame] | 1430 | bool *truncp, bool *created) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1431 | { |
| 1432 | struct dentry *dentry, *dchild = NULL; |
| 1433 | struct inode *dirp; |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1434 | __be32 err; |
| 1435 | int host_err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1436 | __u32 v_mtime=0, v_atime=0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1437 | |
| 1438 | err = nfserr_perm; |
| 1439 | if (!flen) |
| 1440 | goto out; |
| 1441 | err = nfserr_exist; |
| 1442 | if (isdotent(fname, flen)) |
| 1443 | goto out; |
| 1444 | if (!(iap->ia_valid & ATTR_MODE)) |
| 1445 | iap->ia_mode = 0; |
Sachin Prabhu | 1574dff | 2011-04-20 13:09:35 +0100 | [diff] [blame] | 1446 | err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_EXEC); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1447 | if (err) |
| 1448 | goto out; |
| 1449 | |
| 1450 | dentry = fhp->fh_dentry; |
| 1451 | dirp = dentry->d_inode; |
| 1452 | |
| 1453 | /* Get all the sanity checks out of the way before |
| 1454 | * we lock the parent. */ |
| 1455 | err = nfserr_notdir; |
Al Viro | acfa438 | 2008-12-04 10:06:33 -0500 | [diff] [blame] | 1456 | if (!dirp->i_op->lookup) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1457 | goto out; |
Peter Zijlstra | 12fd352 | 2006-10-02 02:18:03 -0700 | [diff] [blame] | 1458 | fh_lock_nested(fhp, I_MUTEX_PARENT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1459 | |
| 1460 | /* |
| 1461 | * Compose the response file handle. |
| 1462 | */ |
| 1463 | dchild = lookup_one_len(fname, dentry, flen); |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1464 | host_err = PTR_ERR(dchild); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1465 | if (IS_ERR(dchild)) |
| 1466 | goto out_nfserr; |
| 1467 | |
Sachin Prabhu | 1574dff | 2011-04-20 13:09:35 +0100 | [diff] [blame] | 1468 | /* If file doesn't exist, check for permissions to create one */ |
| 1469 | if (!dchild->d_inode) { |
| 1470 | err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_CREATE); |
| 1471 | if (err) |
| 1472 | goto out; |
| 1473 | } |
| 1474 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1475 | err = fh_compose(resfhp, fhp->fh_export, dchild, fhp); |
| 1476 | if (err) |
| 1477 | goto out; |
| 1478 | |
Mi Jinlong | ac6721a | 2011-04-20 17:06:25 +0800 | [diff] [blame] | 1479 | if (nfsd_create_is_exclusive(createmode)) { |
Peter Staubach | c397852 | 2007-01-26 00:57:00 -0800 | [diff] [blame] | 1480 | /* solaris7 gets confused (bugid 4218508) if these have |
Jeff Layton | 749997e | 2007-07-31 00:37:51 -0700 | [diff] [blame] | 1481 | * the high bit set, so just clear the high bits. If this is |
| 1482 | * ever changed to use different attrs for storing the |
| 1483 | * verifier, then do_open_lookup() will also need to be fixed |
| 1484 | * accordingly. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1485 | */ |
| 1486 | v_mtime = verifier[0]&0x7fffffff; |
| 1487 | v_atime = verifier[1]&0x7fffffff; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1488 | } |
| 1489 | |
Al Viro | bad0dcf | 2011-11-23 12:03:18 -0500 | [diff] [blame] | 1490 | host_err = fh_want_write(fhp); |
Dave Hansen | 463c319 | 2008-02-15 14:37:57 -0800 | [diff] [blame] | 1491 | if (host_err) |
| 1492 | goto out_nfserr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1493 | if (dchild->d_inode) { |
| 1494 | err = 0; |
| 1495 | |
| 1496 | switch (createmode) { |
| 1497 | case NFS3_CREATE_UNCHECKED: |
| 1498 | if (! S_ISREG(dchild->d_inode->i_mode)) |
J. Bruce Fields | 9dc4e6c | 2012-04-09 18:06:49 -0400 | [diff] [blame] | 1499 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1500 | else if (truncp) { |
| 1501 | /* in nfsv4, we need to treat this case a little |
| 1502 | * differently. we don't want to truncate the |
| 1503 | * file now; this would be wrong if the OPEN |
| 1504 | * fails for some other reason. furthermore, |
| 1505 | * if the size is nonzero, we should ignore it |
| 1506 | * according to spec! |
| 1507 | */ |
| 1508 | *truncp = (iap->ia_valid & ATTR_SIZE) && !iap->ia_size; |
| 1509 | } |
| 1510 | else { |
| 1511 | iap->ia_valid &= ATTR_SIZE; |
| 1512 | goto set_attr; |
| 1513 | } |
| 1514 | break; |
| 1515 | case NFS3_CREATE_EXCLUSIVE: |
| 1516 | if ( dchild->d_inode->i_mtime.tv_sec == v_mtime |
| 1517 | && dchild->d_inode->i_atime.tv_sec == v_atime |
Neil Brown | 44c88ab | 2012-12-07 15:40:55 -0500 | [diff] [blame] | 1518 | && dchild->d_inode->i_size == 0 ) { |
| 1519 | if (created) |
| 1520 | *created = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1521 | break; |
Neil Brown | 44c88ab | 2012-12-07 15:40:55 -0500 | [diff] [blame] | 1522 | } |
Mi Jinlong | ac6721a | 2011-04-20 17:06:25 +0800 | [diff] [blame] | 1523 | case NFS4_CREATE_EXCLUSIVE4_1: |
| 1524 | if ( dchild->d_inode->i_mtime.tv_sec == v_mtime |
| 1525 | && dchild->d_inode->i_atime.tv_sec == v_atime |
Neil Brown | 44c88ab | 2012-12-07 15:40:55 -0500 | [diff] [blame] | 1526 | && dchild->d_inode->i_size == 0 ) { |
| 1527 | if (created) |
| 1528 | *created = 1; |
Mi Jinlong | ac6721a | 2011-04-20 17:06:25 +0800 | [diff] [blame] | 1529 | goto set_attr; |
Neil Brown | 44c88ab | 2012-12-07 15:40:55 -0500 | [diff] [blame] | 1530 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1531 | /* fallthru */ |
| 1532 | case NFS3_CREATE_GUARDED: |
| 1533 | err = nfserr_exist; |
| 1534 | } |
Al Viro | bad0dcf | 2011-11-23 12:03:18 -0500 | [diff] [blame] | 1535 | fh_drop_write(fhp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1536 | goto out; |
| 1537 | } |
| 1538 | |
Al Viro | 8da0eaf | 2012-06-10 18:09:36 -0400 | [diff] [blame] | 1539 | host_err = vfs_create(dirp, dchild, iap->ia_mode, true); |
Dave Hansen | 463c319 | 2008-02-15 14:37:57 -0800 | [diff] [blame] | 1540 | if (host_err < 0) { |
Al Viro | bad0dcf | 2011-11-23 12:03:18 -0500 | [diff] [blame] | 1541 | fh_drop_write(fhp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1542 | goto out_nfserr; |
Dave Hansen | 463c319 | 2008-02-15 14:37:57 -0800 | [diff] [blame] | 1543 | } |
J. Bruce Fields | 81ac95c | 2006-11-08 17:44:40 -0800 | [diff] [blame] | 1544 | if (created) |
| 1545 | *created = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1546 | |
wengang wang | 4ac35c2 | 2009-02-10 11:27:51 +0800 | [diff] [blame] | 1547 | nfsd_check_ignore_resizing(iap); |
| 1548 | |
Mi Jinlong | ac6721a | 2011-04-20 17:06:25 +0800 | [diff] [blame] | 1549 | if (nfsd_create_is_exclusive(createmode)) { |
Peter Staubach | c397852 | 2007-01-26 00:57:00 -0800 | [diff] [blame] | 1550 | /* Cram the verifier into atime/mtime */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1551 | iap->ia_valid = ATTR_MTIME|ATTR_ATIME |
Peter Staubach | c397852 | 2007-01-26 00:57:00 -0800 | [diff] [blame] | 1552 | | ATTR_MTIME_SET|ATTR_ATIME_SET; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1553 | /* XXX someone who knows this better please fix it for nsec */ |
| 1554 | iap->ia_mtime.tv_sec = v_mtime; |
| 1555 | iap->ia_atime.tv_sec = v_atime; |
| 1556 | iap->ia_mtime.tv_nsec = 0; |
| 1557 | iap->ia_atime.tv_nsec = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1558 | } |
| 1559 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1560 | set_attr: |
Ben Myers | f501912 | 2010-02-17 14:05:11 -0600 | [diff] [blame] | 1561 | err = nfsd_create_setattr(rqstp, resfhp, iap); |
| 1562 | |
| 1563 | /* |
| 1564 | * nfsd_setattr already committed the child (and possibly also the parent). |
| 1565 | */ |
| 1566 | if (!err) |
| 1567 | err = nfserrno(commit_metadata(fhp)); |
YAMAMOTO Takashi | f193fba | 2006-01-18 17:43:13 -0800 | [diff] [blame] | 1568 | |
Al Viro | bad0dcf | 2011-11-23 12:03:18 -0500 | [diff] [blame] | 1569 | fh_drop_write(fhp); |
YAMAMOTO Takashi | f193fba | 2006-01-18 17:43:13 -0800 | [diff] [blame] | 1570 | /* |
| 1571 | * Update the filehandle to get the new inode info. |
| 1572 | */ |
| 1573 | if (!err) |
| 1574 | err = fh_update(resfhp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1575 | |
| 1576 | out: |
| 1577 | fh_unlock(fhp); |
| 1578 | if (dchild && !IS_ERR(dchild)) |
| 1579 | dput(dchild); |
| 1580 | return err; |
| 1581 | |
| 1582 | out_nfserr: |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1583 | err = nfserrno(host_err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1584 | goto out; |
| 1585 | } |
| 1586 | #endif /* CONFIG_NFSD_V3 */ |
| 1587 | |
| 1588 | /* |
| 1589 | * Read a symlink. On entry, *lenp must contain the maximum path length that |
| 1590 | * fits into the buffer. On return, it contains the true length. |
| 1591 | * N.B. After this call fhp needs an fh_put |
| 1592 | */ |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1593 | __be32 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1594 | nfsd_readlink(struct svc_rqst *rqstp, struct svc_fh *fhp, char *buf, int *lenp) |
| 1595 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1596 | struct inode *inode; |
| 1597 | mm_segment_t oldfs; |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1598 | __be32 err; |
| 1599 | int host_err; |
Al Viro | 68ac123 | 2012-03-15 08:21:57 -0400 | [diff] [blame] | 1600 | struct path path; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1601 | |
Miklos Szeredi | 8837abc | 2008-06-16 13:20:29 +0200 | [diff] [blame] | 1602 | err = fh_verify(rqstp, fhp, S_IFLNK, NFSD_MAY_NOP); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1603 | if (err) |
| 1604 | goto out; |
| 1605 | |
Al Viro | 68ac123 | 2012-03-15 08:21:57 -0400 | [diff] [blame] | 1606 | path.mnt = fhp->fh_export->ex_path.mnt; |
| 1607 | path.dentry = fhp->fh_dentry; |
| 1608 | inode = path.dentry->d_inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1609 | |
| 1610 | err = nfserr_inval; |
Al Viro | acfa438 | 2008-12-04 10:06:33 -0500 | [diff] [blame] | 1611 | if (!inode->i_op->readlink) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1612 | goto out; |
| 1613 | |
Al Viro | 68ac123 | 2012-03-15 08:21:57 -0400 | [diff] [blame] | 1614 | touch_atime(&path); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1615 | /* N.B. Why does this call need a get_fs()?? |
| 1616 | * Remove the set_fs and watch the fireworks:-) --okir |
| 1617 | */ |
| 1618 | |
| 1619 | oldfs = get_fs(); set_fs(KERNEL_DS); |
Al Viro | 68ac123 | 2012-03-15 08:21:57 -0400 | [diff] [blame] | 1620 | host_err = inode->i_op->readlink(path.dentry, buf, *lenp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1621 | set_fs(oldfs); |
| 1622 | |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1623 | if (host_err < 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1624 | goto out_nfserr; |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1625 | *lenp = host_err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1626 | err = 0; |
| 1627 | out: |
| 1628 | return err; |
| 1629 | |
| 1630 | out_nfserr: |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1631 | err = nfserrno(host_err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1632 | goto out; |
| 1633 | } |
| 1634 | |
| 1635 | /* |
| 1636 | * Create a symlink and look up its inode |
| 1637 | * N.B. After this call _both_ fhp and resfhp need an fh_put |
| 1638 | */ |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1639 | __be32 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1640 | nfsd_symlink(struct svc_rqst *rqstp, struct svc_fh *fhp, |
| 1641 | char *fname, int flen, |
| 1642 | char *path, int plen, |
| 1643 | struct svc_fh *resfhp, |
| 1644 | struct iattr *iap) |
| 1645 | { |
| 1646 | struct dentry *dentry, *dnew; |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1647 | __be32 err, cerr; |
| 1648 | int host_err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1649 | |
| 1650 | err = nfserr_noent; |
| 1651 | if (!flen || !plen) |
| 1652 | goto out; |
| 1653 | err = nfserr_exist; |
| 1654 | if (isdotent(fname, flen)) |
| 1655 | goto out; |
| 1656 | |
Miklos Szeredi | 8837abc | 2008-06-16 13:20:29 +0200 | [diff] [blame] | 1657 | err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_CREATE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1658 | if (err) |
| 1659 | goto out; |
| 1660 | fh_lock(fhp); |
| 1661 | dentry = fhp->fh_dentry; |
| 1662 | dnew = lookup_one_len(fname, dentry, flen); |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1663 | host_err = PTR_ERR(dnew); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1664 | if (IS_ERR(dnew)) |
| 1665 | goto out_nfserr; |
| 1666 | |
Al Viro | bad0dcf | 2011-11-23 12:03:18 -0500 | [diff] [blame] | 1667 | host_err = fh_want_write(fhp); |
Dave Hansen | 75c3f29 | 2008-02-15 14:37:45 -0800 | [diff] [blame] | 1668 | if (host_err) |
| 1669 | goto out_nfserr; |
| 1670 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1671 | if (unlikely(path[plen] != 0)) { |
| 1672 | char *path_alloced = kmalloc(plen+1, GFP_KERNEL); |
| 1673 | if (path_alloced == NULL) |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1674 | host_err = -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1675 | else { |
| 1676 | strncpy(path_alloced, path, plen); |
| 1677 | path_alloced[plen] = 0; |
Miklos Szeredi | db2e747 | 2008-06-24 16:50:16 +0200 | [diff] [blame] | 1678 | host_err = vfs_symlink(dentry->d_inode, dnew, path_alloced); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1679 | kfree(path_alloced); |
| 1680 | } |
| 1681 | } else |
Miklos Szeredi | db2e747 | 2008-06-24 16:50:16 +0200 | [diff] [blame] | 1682 | host_err = vfs_symlink(dentry->d_inode, dnew, path); |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1683 | err = nfserrno(host_err); |
Ben Myers | f501912 | 2010-02-17 14:05:11 -0600 | [diff] [blame] | 1684 | if (!err) |
| 1685 | err = nfserrno(commit_metadata(fhp)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1686 | fh_unlock(fhp); |
| 1687 | |
Al Viro | bad0dcf | 2011-11-23 12:03:18 -0500 | [diff] [blame] | 1688 | fh_drop_write(fhp); |
Dave Hansen | 75c3f29 | 2008-02-15 14:37:45 -0800 | [diff] [blame] | 1689 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1690 | cerr = fh_compose(resfhp, fhp->fh_export, dnew, fhp); |
| 1691 | dput(dnew); |
| 1692 | if (err==0) err = cerr; |
| 1693 | out: |
| 1694 | return err; |
| 1695 | |
| 1696 | out_nfserr: |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1697 | err = nfserrno(host_err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1698 | goto out; |
| 1699 | } |
| 1700 | |
| 1701 | /* |
| 1702 | * Create a hardlink |
| 1703 | * N.B. After this call _both_ ffhp and tfhp need an fh_put |
| 1704 | */ |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1705 | __be32 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1706 | nfsd_link(struct svc_rqst *rqstp, struct svc_fh *ffhp, |
| 1707 | char *name, int len, struct svc_fh *tfhp) |
| 1708 | { |
| 1709 | struct dentry *ddir, *dnew, *dold; |
J. Bruce Fields | 55b1335 | 2010-07-19 16:38:24 -0400 | [diff] [blame] | 1710 | struct inode *dirp; |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1711 | __be32 err; |
| 1712 | int host_err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1713 | |
Miklos Szeredi | 8837abc | 2008-06-16 13:20:29 +0200 | [diff] [blame] | 1714 | err = fh_verify(rqstp, ffhp, S_IFDIR, NFSD_MAY_CREATE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1715 | if (err) |
| 1716 | goto out; |
J. Bruce Fields | 7d818a7 | 2011-08-15 16:59:55 -0400 | [diff] [blame] | 1717 | err = fh_verify(rqstp, tfhp, 0, NFSD_MAY_NOP); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1718 | if (err) |
| 1719 | goto out; |
J. Bruce Fields | 7d818a7 | 2011-08-15 16:59:55 -0400 | [diff] [blame] | 1720 | err = nfserr_isdir; |
| 1721 | if (S_ISDIR(tfhp->fh_dentry->d_inode->i_mode)) |
| 1722 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1723 | err = nfserr_perm; |
| 1724 | if (!len) |
| 1725 | goto out; |
| 1726 | err = nfserr_exist; |
| 1727 | if (isdotent(name, len)) |
| 1728 | goto out; |
| 1729 | |
Peter Zijlstra | 12fd352 | 2006-10-02 02:18:03 -0700 | [diff] [blame] | 1730 | fh_lock_nested(ffhp, I_MUTEX_PARENT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1731 | ddir = ffhp->fh_dentry; |
| 1732 | dirp = ddir->d_inode; |
| 1733 | |
| 1734 | dnew = lookup_one_len(name, ddir, len); |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1735 | host_err = PTR_ERR(dnew); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1736 | if (IS_ERR(dnew)) |
| 1737 | goto out_nfserr; |
| 1738 | |
| 1739 | dold = tfhp->fh_dentry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1740 | |
Al Viro | bad0dcf | 2011-11-23 12:03:18 -0500 | [diff] [blame] | 1741 | host_err = fh_want_write(tfhp); |
Dave Hansen | 75c3f29 | 2008-02-15 14:37:45 -0800 | [diff] [blame] | 1742 | if (host_err) { |
| 1743 | err = nfserrno(host_err); |
| 1744 | goto out_dput; |
| 1745 | } |
J. Bruce Fields | 4795bb3 | 2011-01-11 13:55:46 -0500 | [diff] [blame] | 1746 | err = nfserr_noent; |
| 1747 | if (!dold->d_inode) |
| 1748 | goto out_drop_write; |
| 1749 | host_err = nfsd_break_lease(dold->d_inode); |
Casey Bodley | 7d751f6 | 2011-06-03 12:21:23 -0400 | [diff] [blame] | 1750 | if (host_err) { |
| 1751 | err = nfserrno(host_err); |
J. Bruce Fields | 4795bb3 | 2011-01-11 13:55:46 -0500 | [diff] [blame] | 1752 | goto out_drop_write; |
Casey Bodley | 7d751f6 | 2011-06-03 12:21:23 -0400 | [diff] [blame] | 1753 | } |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1754 | host_err = vfs_link(dold, dirp, dnew); |
| 1755 | if (!host_err) { |
Ben Myers | f501912 | 2010-02-17 14:05:11 -0600 | [diff] [blame] | 1756 | err = nfserrno(commit_metadata(ffhp)); |
| 1757 | if (!err) |
| 1758 | err = nfserrno(commit_metadata(tfhp)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1759 | } else { |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1760 | if (host_err == -EXDEV && rqstp->rq_vers == 2) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1761 | err = nfserr_acces; |
| 1762 | else |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1763 | err = nfserrno(host_err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1764 | } |
J. Bruce Fields | 4795bb3 | 2011-01-11 13:55:46 -0500 | [diff] [blame] | 1765 | out_drop_write: |
Al Viro | bad0dcf | 2011-11-23 12:03:18 -0500 | [diff] [blame] | 1766 | fh_drop_write(tfhp); |
Dave Hansen | 75c3f29 | 2008-02-15 14:37:45 -0800 | [diff] [blame] | 1767 | out_dput: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1768 | dput(dnew); |
David M. Richter | 270d56e | 2006-06-30 01:56:15 -0700 | [diff] [blame] | 1769 | out_unlock: |
| 1770 | fh_unlock(ffhp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1771 | out: |
| 1772 | return err; |
| 1773 | |
| 1774 | out_nfserr: |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1775 | err = nfserrno(host_err); |
David M. Richter | 270d56e | 2006-06-30 01:56:15 -0700 | [diff] [blame] | 1776 | goto out_unlock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1777 | } |
| 1778 | |
| 1779 | /* |
| 1780 | * Rename a file |
| 1781 | * N.B. After this call _both_ ffhp and tfhp need an fh_put |
| 1782 | */ |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1783 | __be32 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1784 | nfsd_rename(struct svc_rqst *rqstp, struct svc_fh *ffhp, char *fname, int flen, |
| 1785 | struct svc_fh *tfhp, char *tname, int tlen) |
| 1786 | { |
| 1787 | struct dentry *fdentry, *tdentry, *odentry, *ndentry, *trap; |
| 1788 | struct inode *fdir, *tdir; |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1789 | __be32 err; |
| 1790 | int host_err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1791 | |
Miklos Szeredi | 8837abc | 2008-06-16 13:20:29 +0200 | [diff] [blame] | 1792 | err = fh_verify(rqstp, ffhp, S_IFDIR, NFSD_MAY_REMOVE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1793 | if (err) |
| 1794 | goto out; |
Miklos Szeredi | 8837abc | 2008-06-16 13:20:29 +0200 | [diff] [blame] | 1795 | err = fh_verify(rqstp, tfhp, S_IFDIR, NFSD_MAY_CREATE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1796 | if (err) |
| 1797 | goto out; |
| 1798 | |
| 1799 | fdentry = ffhp->fh_dentry; |
| 1800 | fdir = fdentry->d_inode; |
| 1801 | |
| 1802 | tdentry = tfhp->fh_dentry; |
| 1803 | tdir = tdentry->d_inode; |
| 1804 | |
| 1805 | err = (rqstp->rq_vers == 2) ? nfserr_acces : nfserr_xdev; |
NeilBrown | a56f393 | 2006-06-30 01:56:10 -0700 | [diff] [blame] | 1806 | if (ffhp->fh_export != tfhp->fh_export) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1807 | goto out; |
| 1808 | |
| 1809 | err = nfserr_perm; |
| 1810 | if (!flen || isdotent(fname, flen) || !tlen || isdotent(tname, tlen)) |
| 1811 | goto out; |
| 1812 | |
| 1813 | /* cannot use fh_lock as we need deadlock protective ordering |
| 1814 | * so do it by hand */ |
| 1815 | trap = lock_rename(tdentry, fdentry); |
| 1816 | ffhp->fh_locked = tfhp->fh_locked = 1; |
| 1817 | fill_pre_wcc(ffhp); |
| 1818 | fill_pre_wcc(tfhp); |
| 1819 | |
| 1820 | odentry = lookup_one_len(fname, fdentry, flen); |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1821 | host_err = PTR_ERR(odentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1822 | if (IS_ERR(odentry)) |
| 1823 | goto out_nfserr; |
| 1824 | |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1825 | host_err = -ENOENT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1826 | if (!odentry->d_inode) |
| 1827 | goto out_dput_old; |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1828 | host_err = -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1829 | if (odentry == trap) |
| 1830 | goto out_dput_old; |
| 1831 | |
| 1832 | ndentry = lookup_one_len(tname, tdentry, tlen); |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1833 | host_err = PTR_ERR(ndentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1834 | if (IS_ERR(ndentry)) |
| 1835 | goto out_dput_old; |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1836 | host_err = -ENOTEMPTY; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1837 | if (ndentry == trap) |
| 1838 | goto out_dput_new; |
| 1839 | |
Dave Hansen | 9079b1e | 2008-02-15 14:37:49 -0800 | [diff] [blame] | 1840 | host_err = -EXDEV; |
| 1841 | if (ffhp->fh_export->ex_path.mnt != tfhp->fh_export->ex_path.mnt) |
| 1842 | goto out_dput_new; |
Al Viro | bad0dcf | 2011-11-23 12:03:18 -0500 | [diff] [blame] | 1843 | host_err = fh_want_write(ffhp); |
Dave Hansen | 9079b1e | 2008-02-15 14:37:49 -0800 | [diff] [blame] | 1844 | if (host_err) |
| 1845 | goto out_dput_new; |
| 1846 | |
J. Bruce Fields | 4795bb3 | 2011-01-11 13:55:46 -0500 | [diff] [blame] | 1847 | host_err = nfsd_break_lease(odentry->d_inode); |
| 1848 | if (host_err) |
| 1849 | goto out_drop_write; |
J. Bruce Fields | 83f6b0c | 2011-02-06 16:46:30 -0500 | [diff] [blame] | 1850 | if (ndentry->d_inode) { |
| 1851 | host_err = nfsd_break_lease(ndentry->d_inode); |
| 1852 | if (host_err) |
| 1853 | goto out_drop_write; |
| 1854 | } |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1855 | host_err = vfs_rename(fdir, odentry, tdir, ndentry); |
Ben Myers | f501912 | 2010-02-17 14:05:11 -0600 | [diff] [blame] | 1856 | if (!host_err) { |
| 1857 | host_err = commit_metadata(tfhp); |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1858 | if (!host_err) |
Ben Myers | f501912 | 2010-02-17 14:05:11 -0600 | [diff] [blame] | 1859 | host_err = commit_metadata(ffhp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1860 | } |
J. Bruce Fields | 4795bb3 | 2011-01-11 13:55:46 -0500 | [diff] [blame] | 1861 | out_drop_write: |
Al Viro | bad0dcf | 2011-11-23 12:03:18 -0500 | [diff] [blame] | 1862 | fh_drop_write(ffhp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1863 | out_dput_new: |
| 1864 | dput(ndentry); |
| 1865 | out_dput_old: |
| 1866 | dput(odentry); |
| 1867 | out_nfserr: |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1868 | err = nfserrno(host_err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1869 | |
| 1870 | /* we cannot reply on fh_unlock on the two filehandles, |
| 1871 | * as that would do the wrong thing if the two directories |
| 1872 | * were the same, so again we do it by hand |
| 1873 | */ |
| 1874 | fill_post_wcc(ffhp); |
| 1875 | fill_post_wcc(tfhp); |
| 1876 | unlock_rename(tdentry, fdentry); |
| 1877 | ffhp->fh_locked = tfhp->fh_locked = 0; |
| 1878 | |
| 1879 | out: |
| 1880 | return err; |
| 1881 | } |
| 1882 | |
| 1883 | /* |
| 1884 | * Unlink a file or directory |
| 1885 | * N.B. After this call fhp needs an fh_put |
| 1886 | */ |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1887 | __be32 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1888 | nfsd_unlink(struct svc_rqst *rqstp, struct svc_fh *fhp, int type, |
| 1889 | char *fname, int flen) |
| 1890 | { |
| 1891 | struct dentry *dentry, *rdentry; |
| 1892 | struct inode *dirp; |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1893 | __be32 err; |
| 1894 | int host_err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1895 | |
| 1896 | err = nfserr_acces; |
| 1897 | if (!flen || isdotent(fname, flen)) |
| 1898 | goto out; |
Miklos Szeredi | 8837abc | 2008-06-16 13:20:29 +0200 | [diff] [blame] | 1899 | err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_REMOVE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1900 | if (err) |
| 1901 | goto out; |
| 1902 | |
Peter Zijlstra | 12fd352 | 2006-10-02 02:18:03 -0700 | [diff] [blame] | 1903 | fh_lock_nested(fhp, I_MUTEX_PARENT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1904 | dentry = fhp->fh_dentry; |
| 1905 | dirp = dentry->d_inode; |
| 1906 | |
| 1907 | rdentry = lookup_one_len(fname, dentry, flen); |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1908 | host_err = PTR_ERR(rdentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1909 | if (IS_ERR(rdentry)) |
| 1910 | goto out_nfserr; |
| 1911 | |
| 1912 | if (!rdentry->d_inode) { |
| 1913 | dput(rdentry); |
| 1914 | err = nfserr_noent; |
| 1915 | goto out; |
| 1916 | } |
| 1917 | |
| 1918 | if (!type) |
| 1919 | type = rdentry->d_inode->i_mode & S_IFMT; |
| 1920 | |
Al Viro | bad0dcf | 2011-11-23 12:03:18 -0500 | [diff] [blame] | 1921 | host_err = fh_want_write(fhp); |
Dave Hansen | 0622753 | 2008-02-15 14:37:34 -0800 | [diff] [blame] | 1922 | if (host_err) |
J. Bruce Fields | 541ce98 | 2011-01-14 20:00:02 -0500 | [diff] [blame] | 1923 | goto out_put; |
Dave Hansen | 0622753 | 2008-02-15 14:37:34 -0800 | [diff] [blame] | 1924 | |
J. Bruce Fields | 4795bb3 | 2011-01-11 13:55:46 -0500 | [diff] [blame] | 1925 | host_err = nfsd_break_lease(rdentry->d_inode); |
| 1926 | if (host_err) |
J. Bruce Fields | 541ce98 | 2011-01-14 20:00:02 -0500 | [diff] [blame] | 1927 | goto out_drop_write; |
J. Bruce Fields | 9ce137e | 2011-01-11 14:07:12 -0500 | [diff] [blame] | 1928 | if (type != S_IFDIR) |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1929 | host_err = vfs_unlink(dirp, rdentry); |
J. Bruce Fields | 9ce137e | 2011-01-11 14:07:12 -0500 | [diff] [blame] | 1930 | else |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1931 | host_err = vfs_rmdir(dirp, rdentry); |
J. Bruce Fields | 541ce98 | 2011-01-14 20:00:02 -0500 | [diff] [blame] | 1932 | if (!host_err) |
| 1933 | host_err = commit_metadata(fhp); |
| 1934 | out_drop_write: |
Al Viro | bad0dcf | 2011-11-23 12:03:18 -0500 | [diff] [blame] | 1935 | fh_drop_write(fhp); |
J. Bruce Fields | 4795bb3 | 2011-01-11 13:55:46 -0500 | [diff] [blame] | 1936 | out_put: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1937 | dput(rdentry); |
| 1938 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1939 | out_nfserr: |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1940 | err = nfserrno(host_err); |
YAMAMOTO Takashi | f193fba | 2006-01-18 17:43:13 -0800 | [diff] [blame] | 1941 | out: |
| 1942 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1943 | } |
| 1944 | |
| 1945 | /* |
David Woodhouse | 14f7dd6 | 2008-07-31 20:29:12 +0100 | [diff] [blame] | 1946 | * We do this buffering because we must not call back into the file |
| 1947 | * system's ->lookup() method from the filldir callback. That may well |
| 1948 | * deadlock a number of file systems. |
| 1949 | * |
| 1950 | * This is based heavily on the implementation of same in XFS. |
| 1951 | */ |
| 1952 | struct buffered_dirent { |
| 1953 | u64 ino; |
| 1954 | loff_t offset; |
| 1955 | int namlen; |
| 1956 | unsigned int d_type; |
| 1957 | char name[]; |
| 1958 | }; |
| 1959 | |
| 1960 | struct readdir_data { |
| 1961 | char *dirent; |
| 1962 | size_t used; |
Al Viro | 53c9c5c | 2008-08-24 07:29:52 -0400 | [diff] [blame] | 1963 | int full; |
David Woodhouse | 14f7dd6 | 2008-07-31 20:29:12 +0100 | [diff] [blame] | 1964 | }; |
| 1965 | |
| 1966 | static int nfsd_buffered_filldir(void *__buf, const char *name, int namlen, |
| 1967 | loff_t offset, u64 ino, unsigned int d_type) |
David Woodhouse | 2628b76 | 2008-07-31 17:16:51 +0100 | [diff] [blame] | 1968 | { |
David Woodhouse | 14f7dd6 | 2008-07-31 20:29:12 +0100 | [diff] [blame] | 1969 | struct readdir_data *buf = __buf; |
| 1970 | struct buffered_dirent *de = (void *)(buf->dirent + buf->used); |
| 1971 | unsigned int reclen; |
| 1972 | |
| 1973 | reclen = ALIGN(sizeof(struct buffered_dirent) + namlen, sizeof(u64)); |
Al Viro | 53c9c5c | 2008-08-24 07:29:52 -0400 | [diff] [blame] | 1974 | if (buf->used + reclen > PAGE_SIZE) { |
| 1975 | buf->full = 1; |
David Woodhouse | 14f7dd6 | 2008-07-31 20:29:12 +0100 | [diff] [blame] | 1976 | return -EINVAL; |
Al Viro | 53c9c5c | 2008-08-24 07:29:52 -0400 | [diff] [blame] | 1977 | } |
David Woodhouse | 14f7dd6 | 2008-07-31 20:29:12 +0100 | [diff] [blame] | 1978 | |
| 1979 | de->namlen = namlen; |
| 1980 | de->offset = offset; |
| 1981 | de->ino = ino; |
| 1982 | de->d_type = d_type; |
| 1983 | memcpy(de->name, name, namlen); |
| 1984 | buf->used += reclen; |
| 1985 | |
| 1986 | return 0; |
| 1987 | } |
| 1988 | |
David Woodhouse | 2f9092e | 2009-04-20 23:18:37 +0100 | [diff] [blame] | 1989 | static __be32 nfsd_buffered_readdir(struct file *file, filldir_t func, |
| 1990 | struct readdir_cd *cdp, loff_t *offsetp) |
David Woodhouse | 14f7dd6 | 2008-07-31 20:29:12 +0100 | [diff] [blame] | 1991 | { |
| 1992 | struct readdir_data buf; |
| 1993 | struct buffered_dirent *de; |
David Woodhouse | 2628b76 | 2008-07-31 17:16:51 +0100 | [diff] [blame] | 1994 | int host_err; |
David Woodhouse | 14f7dd6 | 2008-07-31 20:29:12 +0100 | [diff] [blame] | 1995 | int size; |
| 1996 | loff_t offset; |
David Woodhouse | 2628b76 | 2008-07-31 17:16:51 +0100 | [diff] [blame] | 1997 | |
David Woodhouse | 14f7dd6 | 2008-07-31 20:29:12 +0100 | [diff] [blame] | 1998 | buf.dirent = (void *)__get_free_page(GFP_KERNEL); |
| 1999 | if (!buf.dirent) |
David Woodhouse | 2f9092e | 2009-04-20 23:18:37 +0100 | [diff] [blame] | 2000 | return nfserrno(-ENOMEM); |
David Woodhouse | 2628b76 | 2008-07-31 17:16:51 +0100 | [diff] [blame] | 2001 | |
David Woodhouse | 14f7dd6 | 2008-07-31 20:29:12 +0100 | [diff] [blame] | 2002 | offset = *offsetp; |
David Woodhouse | 14f7dd6 | 2008-07-31 20:29:12 +0100 | [diff] [blame] | 2003 | |
| 2004 | while (1) { |
David Woodhouse | 2f9092e | 2009-04-20 23:18:37 +0100 | [diff] [blame] | 2005 | struct inode *dir_inode = file->f_path.dentry->d_inode; |
David Woodhouse | 14f7dd6 | 2008-07-31 20:29:12 +0100 | [diff] [blame] | 2006 | unsigned int reclen; |
| 2007 | |
Doug Nazar | b726e92 | 2008-11-05 06:16:28 -0500 | [diff] [blame] | 2008 | cdp->err = nfserr_eof; /* will be cleared on successful read */ |
David Woodhouse | 14f7dd6 | 2008-07-31 20:29:12 +0100 | [diff] [blame] | 2009 | buf.used = 0; |
Al Viro | 53c9c5c | 2008-08-24 07:29:52 -0400 | [diff] [blame] | 2010 | buf.full = 0; |
David Woodhouse | 14f7dd6 | 2008-07-31 20:29:12 +0100 | [diff] [blame] | 2011 | |
| 2012 | host_err = vfs_readdir(file, nfsd_buffered_filldir, &buf); |
Al Viro | 53c9c5c | 2008-08-24 07:29:52 -0400 | [diff] [blame] | 2013 | if (buf.full) |
| 2014 | host_err = 0; |
| 2015 | |
| 2016 | if (host_err < 0) |
David Woodhouse | 14f7dd6 | 2008-07-31 20:29:12 +0100 | [diff] [blame] | 2017 | break; |
| 2018 | |
| 2019 | size = buf.used; |
| 2020 | |
| 2021 | if (!size) |
| 2022 | break; |
| 2023 | |
David Woodhouse | 2f9092e | 2009-04-20 23:18:37 +0100 | [diff] [blame] | 2024 | /* |
| 2025 | * Various filldir functions may end up calling back into |
| 2026 | * lookup_one_len() and the file system's ->lookup() method. |
| 2027 | * These expect i_mutex to be held, as it would within readdir. |
| 2028 | */ |
| 2029 | host_err = mutex_lock_killable(&dir_inode->i_mutex); |
| 2030 | if (host_err) |
| 2031 | break; |
| 2032 | |
David Woodhouse | 14f7dd6 | 2008-07-31 20:29:12 +0100 | [diff] [blame] | 2033 | de = (struct buffered_dirent *)buf.dirent; |
| 2034 | while (size > 0) { |
| 2035 | offset = de->offset; |
| 2036 | |
| 2037 | if (func(cdp, de->name, de->namlen, de->offset, |
| 2038 | de->ino, de->d_type)) |
David Woodhouse | 2f9092e | 2009-04-20 23:18:37 +0100 | [diff] [blame] | 2039 | break; |
David Woodhouse | 14f7dd6 | 2008-07-31 20:29:12 +0100 | [diff] [blame] | 2040 | |
| 2041 | if (cdp->err != nfs_ok) |
David Woodhouse | 2f9092e | 2009-04-20 23:18:37 +0100 | [diff] [blame] | 2042 | break; |
David Woodhouse | 14f7dd6 | 2008-07-31 20:29:12 +0100 | [diff] [blame] | 2043 | |
| 2044 | reclen = ALIGN(sizeof(*de) + de->namlen, |
| 2045 | sizeof(u64)); |
| 2046 | size -= reclen; |
| 2047 | de = (struct buffered_dirent *)((char *)de + reclen); |
| 2048 | } |
David Woodhouse | 2f9092e | 2009-04-20 23:18:37 +0100 | [diff] [blame] | 2049 | mutex_unlock(&dir_inode->i_mutex); |
| 2050 | if (size > 0) /* We bailed out early */ |
| 2051 | break; |
| 2052 | |
David Woodhouse | c002a6c | 2008-08-17 17:21:18 +0100 | [diff] [blame] | 2053 | offset = vfs_llseek(file, 0, SEEK_CUR); |
David Woodhouse | 14f7dd6 | 2008-07-31 20:29:12 +0100 | [diff] [blame] | 2054 | } |
| 2055 | |
David Woodhouse | 14f7dd6 | 2008-07-31 20:29:12 +0100 | [diff] [blame] | 2056 | free_page((unsigned long)(buf.dirent)); |
David Woodhouse | 2628b76 | 2008-07-31 17:16:51 +0100 | [diff] [blame] | 2057 | |
| 2058 | if (host_err) |
| 2059 | return nfserrno(host_err); |
David Woodhouse | 14f7dd6 | 2008-07-31 20:29:12 +0100 | [diff] [blame] | 2060 | |
| 2061 | *offsetp = offset; |
| 2062 | return cdp->err; |
David Woodhouse | 2628b76 | 2008-07-31 17:16:51 +0100 | [diff] [blame] | 2063 | } |
| 2064 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2065 | /* |
| 2066 | * Read entries from a directory. |
| 2067 | * The NFSv3/4 verifier we ignore for now. |
| 2068 | */ |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 2069 | __be32 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2070 | nfsd_readdir(struct svc_rqst *rqstp, struct svc_fh *fhp, loff_t *offsetp, |
NeilBrown | a0ad13e | 2007-01-26 00:57:10 -0800 | [diff] [blame] | 2071 | struct readdir_cd *cdp, filldir_t func) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2072 | { |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 2073 | __be32 err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2074 | struct file *file; |
| 2075 | loff_t offset = *offsetp; |
Bernd Schubert | 06effdb | 2012-03-18 22:44:50 -0400 | [diff] [blame] | 2076 | int may_flags = NFSD_MAY_READ; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2077 | |
Bernd Schubert | 06effdb | 2012-03-18 22:44:50 -0400 | [diff] [blame] | 2078 | /* NFSv2 only supports 32 bit cookies */ |
| 2079 | if (rqstp->rq_vers > 2) |
| 2080 | may_flags |= NFSD_MAY_64BIT_COOKIE; |
| 2081 | |
| 2082 | err = nfsd_open(rqstp, fhp, S_IFDIR, may_flags, &file); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2083 | if (err) |
| 2084 | goto out; |
| 2085 | |
| 2086 | offset = vfs_llseek(file, offset, 0); |
| 2087 | if (offset < 0) { |
| 2088 | err = nfserrno((int)offset); |
| 2089 | goto out_close; |
| 2090 | } |
| 2091 | |
David Woodhouse | 14f7dd6 | 2008-07-31 20:29:12 +0100 | [diff] [blame] | 2092 | err = nfsd_buffered_readdir(file, func, cdp, offsetp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2093 | |
| 2094 | if (err == nfserr_eof || err == nfserr_toosmall) |
| 2095 | err = nfs_ok; /* can still be found in ->err */ |
| 2096 | out_close: |
| 2097 | nfsd_close(file); |
| 2098 | out: |
| 2099 | return err; |
| 2100 | } |
| 2101 | |
| 2102 | /* |
| 2103 | * Get file system stats |
| 2104 | * N.B. After this call fhp needs an fh_put |
| 2105 | */ |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 2106 | __be32 |
J. Bruce Fields | 04716e6 | 2008-08-07 13:00:20 -0400 | [diff] [blame] | 2107 | 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] | 2108 | { |
Christoph Hellwig | ebabe9a | 2010-07-07 18:53:11 +0200 | [diff] [blame] | 2109 | __be32 err; |
| 2110 | |
| 2111 | err = fh_verify(rqstp, fhp, 0, NFSD_MAY_NOP | access); |
Takashi Iwai | f6360ef | 2010-08-13 15:53:49 +0200 | [diff] [blame] | 2112 | if (!err) { |
| 2113 | struct path path = { |
| 2114 | .mnt = fhp->fh_export->ex_path.mnt, |
| 2115 | .dentry = fhp->fh_dentry, |
| 2116 | }; |
| 2117 | if (vfs_statfs(&path, stat)) |
| 2118 | err = nfserr_io; |
| 2119 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2120 | return err; |
| 2121 | } |
| 2122 | |
J. Bruce Fields | c7d5140 | 2007-07-19 01:49:20 -0700 | [diff] [blame] | 2123 | 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] | 2124 | { |
J. Bruce Fields | c7d5140 | 2007-07-19 01:49:20 -0700 | [diff] [blame] | 2125 | return nfsexp_flags(rqstp, exp) & NFSEXP_READONLY; |
J. Bruce Fields | e22841c | 2007-07-19 01:49:20 -0700 | [diff] [blame] | 2126 | } |
| 2127 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2128 | /* |
| 2129 | * Check for a user's access permissions to this inode. |
| 2130 | */ |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 2131 | __be32 |
J. Bruce Fields | 0ec757d | 2007-07-17 04:04:48 -0700 | [diff] [blame] | 2132 | nfsd_permission(struct svc_rqst *rqstp, struct svc_export *exp, |
| 2133 | struct dentry *dentry, int acc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2134 | { |
| 2135 | struct inode *inode = dentry->d_inode; |
| 2136 | int err; |
| 2137 | |
J. Bruce Fields | aea9339 | 2011-04-10 10:35:12 -0400 | [diff] [blame] | 2138 | if ((acc & NFSD_MAY_MASK) == NFSD_MAY_NOP) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2139 | return 0; |
| 2140 | #if 0 |
| 2141 | dprintk("nfsd: permission 0x%x%s%s%s%s%s%s%s mode 0%o%s%s%s\n", |
| 2142 | acc, |
Miklos Szeredi | 8837abc | 2008-06-16 13:20:29 +0200 | [diff] [blame] | 2143 | (acc & NFSD_MAY_READ)? " read" : "", |
| 2144 | (acc & NFSD_MAY_WRITE)? " write" : "", |
| 2145 | (acc & NFSD_MAY_EXEC)? " exec" : "", |
| 2146 | (acc & NFSD_MAY_SATTR)? " sattr" : "", |
| 2147 | (acc & NFSD_MAY_TRUNC)? " trunc" : "", |
| 2148 | (acc & NFSD_MAY_LOCK)? " lock" : "", |
| 2149 | (acc & NFSD_MAY_OWNER_OVERRIDE)? " owneroverride" : "", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2150 | inode->i_mode, |
| 2151 | IS_IMMUTABLE(inode)? " immut" : "", |
| 2152 | IS_APPEND(inode)? " append" : "", |
Dave Hansen | 2c463e9 | 2008-02-15 14:37:56 -0800 | [diff] [blame] | 2153 | __mnt_is_readonly(exp->ex_path.mnt)? " ro" : ""); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2154 | dprintk(" owner %d/%d user %d/%d\n", |
David Howells | 5cc0a84 | 2008-11-14 10:38:58 +1100 | [diff] [blame] | 2155 | inode->i_uid, inode->i_gid, current_fsuid(), current_fsgid()); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2156 | #endif |
| 2157 | |
| 2158 | /* Normally we reject any write/sattr etc access on a read-only file |
| 2159 | * system. But if it is IRIX doing check on write-access for a |
| 2160 | * device special file, we ignore rofs. |
| 2161 | */ |
Miklos Szeredi | 8837abc | 2008-06-16 13:20:29 +0200 | [diff] [blame] | 2162 | if (!(acc & NFSD_MAY_LOCAL_ACCESS)) |
| 2163 | if (acc & (NFSD_MAY_WRITE | NFSD_MAY_SATTR | NFSD_MAY_TRUNC)) { |
Dave Hansen | 2c463e9 | 2008-02-15 14:37:56 -0800 | [diff] [blame] | 2164 | if (exp_rdonly(rqstp, exp) || |
| 2165 | __mnt_is_readonly(exp->ex_path.mnt)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2166 | return nfserr_rofs; |
Miklos Szeredi | 8837abc | 2008-06-16 13:20:29 +0200 | [diff] [blame] | 2167 | if (/* (acc & NFSD_MAY_WRITE) && */ IS_IMMUTABLE(inode)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2168 | return nfserr_perm; |
| 2169 | } |
Miklos Szeredi | 8837abc | 2008-06-16 13:20:29 +0200 | [diff] [blame] | 2170 | if ((acc & NFSD_MAY_TRUNC) && IS_APPEND(inode)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2171 | return nfserr_perm; |
| 2172 | |
Miklos Szeredi | 8837abc | 2008-06-16 13:20:29 +0200 | [diff] [blame] | 2173 | if (acc & NFSD_MAY_LOCK) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2174 | /* If we cannot rely on authentication in NLM requests, |
| 2175 | * just allow locks, otherwise require read permission, or |
| 2176 | * ownership |
| 2177 | */ |
| 2178 | if (exp->ex_flags & NFSEXP_NOAUTHNLM) |
| 2179 | return 0; |
| 2180 | else |
Miklos Szeredi | 8837abc | 2008-06-16 13:20:29 +0200 | [diff] [blame] | 2181 | acc = NFSD_MAY_READ | NFSD_MAY_OWNER_OVERRIDE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2182 | } |
| 2183 | /* |
| 2184 | * The file owner always gets access permission for accesses that |
| 2185 | * would normally be checked at open time. This is to make |
| 2186 | * file access work even when the client has done a fchmod(fd, 0). |
| 2187 | * |
| 2188 | * However, `cp foo bar' should fail nevertheless when bar is |
| 2189 | * readonly. A sensible way to do this might be to reject all |
| 2190 | * attempts to truncate a read-only file, because a creat() call |
| 2191 | * always implies file truncation. |
| 2192 | * ... but this isn't really fair. A process may reasonably call |
| 2193 | * ftruncate on an open file descriptor on a file with perm 000. |
| 2194 | * We must trust the client to do permission checking - using "ACCESS" |
| 2195 | * with NFSv3. |
| 2196 | */ |
Miklos Szeredi | 8837abc | 2008-06-16 13:20:29 +0200 | [diff] [blame] | 2197 | if ((acc & NFSD_MAY_OWNER_OVERRIDE) && |
David Howells | 5cc0a84 | 2008-11-14 10:38:58 +1100 | [diff] [blame] | 2198 | inode->i_uid == current_fsuid()) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2199 | return 0; |
| 2200 | |
Miklos Szeredi | 8837abc | 2008-06-16 13:20:29 +0200 | [diff] [blame] | 2201 | /* This assumes NFSD_MAY_{READ,WRITE,EXEC} == MAY_{READ,WRITE,EXEC} */ |
Al Viro | f419a2e | 2008-07-22 00:07:17 -0400 | [diff] [blame] | 2202 | err = inode_permission(inode, acc & (MAY_READ|MAY_WRITE|MAY_EXEC)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2203 | |
| 2204 | /* Allow read access to binaries even when mode 111 */ |
| 2205 | if (err == -EACCES && S_ISREG(inode->i_mode) && |
J. Bruce Fields | a043226 | 2011-08-25 10:48:39 -0400 | [diff] [blame] | 2206 | (acc == (NFSD_MAY_READ | NFSD_MAY_OWNER_OVERRIDE) || |
| 2207 | acc == (NFSD_MAY_READ | NFSD_MAY_READ_IF_EXEC))) |
Al Viro | f419a2e | 2008-07-22 00:07:17 -0400 | [diff] [blame] | 2208 | err = inode_permission(inode, MAY_EXEC); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2209 | |
| 2210 | return err? nfserrno(err) : 0; |
| 2211 | } |
| 2212 | |
| 2213 | void |
| 2214 | nfsd_racache_shutdown(void) |
| 2215 | { |
Jeff Layton | 54a66e5 | 2008-08-13 22:03:27 -0400 | [diff] [blame] | 2216 | struct raparms *raparm, *last_raparm; |
| 2217 | unsigned int i; |
| 2218 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2219 | dprintk("nfsd: freeing readahead buffers.\n"); |
Jeff Layton | 54a66e5 | 2008-08-13 22:03:27 -0400 | [diff] [blame] | 2220 | |
| 2221 | for (i = 0; i < RAPARM_HASH_SIZE; i++) { |
| 2222 | raparm = raparm_hash[i].pb_head; |
| 2223 | while(raparm) { |
| 2224 | last_raparm = raparm; |
| 2225 | raparm = raparm->p_next; |
| 2226 | kfree(last_raparm); |
| 2227 | } |
| 2228 | raparm_hash[i].pb_head = NULL; |
| 2229 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2230 | } |
| 2231 | /* |
| 2232 | * Initialize readahead param cache |
| 2233 | */ |
| 2234 | int |
| 2235 | nfsd_racache_init(int cache_size) |
| 2236 | { |
| 2237 | int i; |
Greg Banks | fce1456 | 2006-10-04 02:15:49 -0700 | [diff] [blame] | 2238 | int j = 0; |
| 2239 | int nperbucket; |
Jeff Layton | 54a66e5 | 2008-08-13 22:03:27 -0400 | [diff] [blame] | 2240 | struct raparms **raparm = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2241 | |
Greg Banks | fce1456 | 2006-10-04 02:15:49 -0700 | [diff] [blame] | 2242 | |
Jeff Layton | 54a66e5 | 2008-08-13 22:03:27 -0400 | [diff] [blame] | 2243 | if (raparm_hash[0].pb_head) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2244 | return 0; |
Jeff Layton | 54a66e5 | 2008-08-13 22:03:27 -0400 | [diff] [blame] | 2245 | nperbucket = DIV_ROUND_UP(cache_size, RAPARM_HASH_SIZE); |
| 2246 | if (nperbucket < 2) |
| 2247 | nperbucket = 2; |
| 2248 | cache_size = nperbucket * RAPARM_HASH_SIZE; |
Yan Burman | 4b3bb06 | 2006-12-08 02:39:41 -0800 | [diff] [blame] | 2249 | |
| 2250 | dprintk("nfsd: allocating %d readahead buffers.\n", cache_size); |
Jeff Layton | 54a66e5 | 2008-08-13 22:03:27 -0400 | [diff] [blame] | 2251 | |
| 2252 | for (i = 0; i < RAPARM_HASH_SIZE; i++) { |
Yan Burman | 4b3bb06 | 2006-12-08 02:39:41 -0800 | [diff] [blame] | 2253 | spin_lock_init(&raparm_hash[i].pb_lock); |
Jeff Layton | 54a66e5 | 2008-08-13 22:03:27 -0400 | [diff] [blame] | 2254 | |
| 2255 | raparm = &raparm_hash[i].pb_head; |
| 2256 | for (j = 0; j < nperbucket; j++) { |
| 2257 | *raparm = kzalloc(sizeof(struct raparms), GFP_KERNEL); |
| 2258 | if (!*raparm) |
| 2259 | goto out_nomem; |
| 2260 | raparm = &(*raparm)->p_next; |
| 2261 | } |
| 2262 | *raparm = NULL; |
Yan Burman | 4b3bb06 | 2006-12-08 02:39:41 -0800 | [diff] [blame] | 2263 | } |
| 2264 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2265 | nfsdstats.ra_size = cache_size; |
| 2266 | return 0; |
Jeff Layton | 54a66e5 | 2008-08-13 22:03:27 -0400 | [diff] [blame] | 2267 | |
| 2268 | out_nomem: |
| 2269 | dprintk("nfsd: kmalloc failed, freeing readahead buffers\n"); |
| 2270 | nfsd_racache_shutdown(); |
| 2271 | return -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2272 | } |
Andreas Gruenbacher | a257cdd | 2005-06-22 17:16:26 +0000 | [diff] [blame] | 2273 | |
| 2274 | #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) |
| 2275 | struct posix_acl * |
| 2276 | nfsd_get_posix_acl(struct svc_fh *fhp, int type) |
| 2277 | { |
| 2278 | struct inode *inode = fhp->fh_dentry->d_inode; |
| 2279 | char *name; |
| 2280 | void *value = NULL; |
| 2281 | ssize_t size; |
| 2282 | struct posix_acl *acl; |
| 2283 | |
Christoph Hellwig | 5be196e | 2006-01-09 20:51:55 -0800 | [diff] [blame] | 2284 | if (!IS_POSIXACL(inode)) |
Andreas Gruenbacher | a257cdd | 2005-06-22 17:16:26 +0000 | [diff] [blame] | 2285 | return ERR_PTR(-EOPNOTSUPP); |
Christoph Hellwig | 5be196e | 2006-01-09 20:51:55 -0800 | [diff] [blame] | 2286 | |
| 2287 | switch (type) { |
| 2288 | case ACL_TYPE_ACCESS: |
| 2289 | name = POSIX_ACL_XATTR_ACCESS; |
| 2290 | break; |
| 2291 | case ACL_TYPE_DEFAULT: |
| 2292 | name = POSIX_ACL_XATTR_DEFAULT; |
| 2293 | break; |
| 2294 | default: |
| 2295 | return ERR_PTR(-EOPNOTSUPP); |
Andreas Gruenbacher | a257cdd | 2005-06-22 17:16:26 +0000 | [diff] [blame] | 2296 | } |
| 2297 | |
Christoph Hellwig | 5be196e | 2006-01-09 20:51:55 -0800 | [diff] [blame] | 2298 | size = nfsd_getxattr(fhp->fh_dentry, name, &value); |
| 2299 | if (size < 0) |
| 2300 | return ERR_PTR(size); |
Andreas Gruenbacher | a257cdd | 2005-06-22 17:16:26 +0000 | [diff] [blame] | 2301 | |
Andreas Gruenbacher | a257cdd | 2005-06-22 17:16:26 +0000 | [diff] [blame] | 2302 | acl = posix_acl_from_xattr(value, size); |
Andreas Gruenbacher | a257cdd | 2005-06-22 17:16:26 +0000 | [diff] [blame] | 2303 | kfree(value); |
| 2304 | return acl; |
| 2305 | } |
| 2306 | |
| 2307 | int |
| 2308 | nfsd_set_posix_acl(struct svc_fh *fhp, int type, struct posix_acl *acl) |
| 2309 | { |
| 2310 | struct inode *inode = fhp->fh_dentry->d_inode; |
| 2311 | char *name; |
| 2312 | void *value = NULL; |
| 2313 | size_t size; |
| 2314 | int error; |
| 2315 | |
Al Viro | acfa438 | 2008-12-04 10:06:33 -0500 | [diff] [blame] | 2316 | if (!IS_POSIXACL(inode) || |
Andreas Gruenbacher | a257cdd | 2005-06-22 17:16:26 +0000 | [diff] [blame] | 2317 | !inode->i_op->setxattr || !inode->i_op->removexattr) |
| 2318 | return -EOPNOTSUPP; |
| 2319 | switch(type) { |
| 2320 | case ACL_TYPE_ACCESS: |
Christoph Hellwig | 334a13e | 2005-06-28 20:44:58 -0700 | [diff] [blame] | 2321 | name = POSIX_ACL_XATTR_ACCESS; |
Andreas Gruenbacher | a257cdd | 2005-06-22 17:16:26 +0000 | [diff] [blame] | 2322 | break; |
| 2323 | case ACL_TYPE_DEFAULT: |
Christoph Hellwig | 334a13e | 2005-06-28 20:44:58 -0700 | [diff] [blame] | 2324 | name = POSIX_ACL_XATTR_DEFAULT; |
Andreas Gruenbacher | a257cdd | 2005-06-22 17:16:26 +0000 | [diff] [blame] | 2325 | break; |
| 2326 | default: |
| 2327 | return -EOPNOTSUPP; |
| 2328 | } |
| 2329 | |
| 2330 | if (acl && acl->a_count) { |
Christoph Hellwig | 334a13e | 2005-06-28 20:44:58 -0700 | [diff] [blame] | 2331 | size = posix_acl_xattr_size(acl->a_count); |
Andreas Gruenbacher | a257cdd | 2005-06-22 17:16:26 +0000 | [diff] [blame] | 2332 | value = kmalloc(size, GFP_KERNEL); |
| 2333 | if (!value) |
| 2334 | return -ENOMEM; |
Florin Malita | 9ccfc29 | 2006-05-20 14:59:58 -0700 | [diff] [blame] | 2335 | error = posix_acl_to_xattr(acl, value, size); |
| 2336 | if (error < 0) |
Andreas Gruenbacher | a257cdd | 2005-06-22 17:16:26 +0000 | [diff] [blame] | 2337 | goto getout; |
Florin Malita | 9ccfc29 | 2006-05-20 14:59:58 -0700 | [diff] [blame] | 2338 | size = error; |
Andreas Gruenbacher | a257cdd | 2005-06-22 17:16:26 +0000 | [diff] [blame] | 2339 | } else |
| 2340 | size = 0; |
| 2341 | |
Al Viro | bad0dcf | 2011-11-23 12:03:18 -0500 | [diff] [blame] | 2342 | error = fh_want_write(fhp); |
Dave Hansen | 18f335a | 2008-02-15 14:37:38 -0800 | [diff] [blame] | 2343 | if (error) |
| 2344 | goto getout; |
Andreas Gruenbacher | a257cdd | 2005-06-22 17:16:26 +0000 | [diff] [blame] | 2345 | if (size) |
Christoph Hellwig | 5be196e | 2006-01-09 20:51:55 -0800 | [diff] [blame] | 2346 | error = vfs_setxattr(fhp->fh_dentry, name, value, size, 0); |
Andreas Gruenbacher | a257cdd | 2005-06-22 17:16:26 +0000 | [diff] [blame] | 2347 | else { |
| 2348 | if (!S_ISDIR(inode->i_mode) && type == ACL_TYPE_DEFAULT) |
| 2349 | error = 0; |
| 2350 | else { |
Christoph Hellwig | 5be196e | 2006-01-09 20:51:55 -0800 | [diff] [blame] | 2351 | error = vfs_removexattr(fhp->fh_dentry, name); |
Andreas Gruenbacher | a257cdd | 2005-06-22 17:16:26 +0000 | [diff] [blame] | 2352 | if (error == -ENODATA) |
| 2353 | error = 0; |
| 2354 | } |
| 2355 | } |
Al Viro | bad0dcf | 2011-11-23 12:03:18 -0500 | [diff] [blame] | 2356 | fh_drop_write(fhp); |
Andreas Gruenbacher | a257cdd | 2005-06-22 17:16:26 +0000 | [diff] [blame] | 2357 | |
| 2358 | getout: |
| 2359 | kfree(value); |
| 2360 | return error; |
| 2361 | } |
| 2362 | #endif /* defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) */ |