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> |
Anna Schumaker | 95d871f | 2014-11-07 14:44:26 -0500 | [diff] [blame] | 19 | #include <linux/falloc.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 20 | #include <linux/fcntl.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 21 | #include <linux/namei.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 22 | #include <linux/delay.h> |
Robert Love | 0eeca28 | 2005-07-12 17:06:03 -0400 | [diff] [blame] | 23 | #include <linux/fsnotify.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 24 | #include <linux/posix_acl_xattr.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 25 | #include <linux/xattr.h> |
Boaz Harrosh | 9a74af2 | 2009-12-03 20:30:56 +0200 | [diff] [blame] | 26 | #include <linux/jhash.h> |
| 27 | #include <linux/ima.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 28 | #include <linux/slab.h> |
Boaz Harrosh | 9a74af2 | 2009-12-03 20:30:56 +0200 | [diff] [blame] | 29 | #include <asm/uaccess.h> |
Ben Myers | f501912 | 2010-02-17 14:05:11 -0600 | [diff] [blame] | 30 | #include <linux/exportfs.h> |
| 31 | #include <linux/writeback.h> |
David Quigley | 18032ca | 2013-05-02 13:19:10 -0400 | [diff] [blame] | 32 | #include <linux/security.h> |
Boaz Harrosh | 9a74af2 | 2009-12-03 20:30:56 +0200 | [diff] [blame] | 33 | |
| 34 | #ifdef CONFIG_NFSD_V3 |
| 35 | #include "xdr3.h" |
| 36 | #endif /* CONFIG_NFSD_V3 */ |
| 37 | |
Christoph Hellwig | 5be196e | 2006-01-09 20:51:55 -0800 | [diff] [blame] | 38 | #ifdef CONFIG_NFSD_V4 |
Christoph Hellwig | ffa0160 | 2015-12-03 12:59:52 +0100 | [diff] [blame] | 39 | #include "../internal.h" |
J. Bruce Fields | 2ca72e1 | 2011-01-04 17:37:15 -0500 | [diff] [blame] | 40 | #include "acl.h" |
| 41 | #include "idmap.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 42 | #endif /* CONFIG_NFSD_V4 */ |
| 43 | |
Boaz Harrosh | 9a74af2 | 2009-12-03 20:30:56 +0200 | [diff] [blame] | 44 | #include "nfsd.h" |
| 45 | #include "vfs.h" |
Jeff Layton | 6e8b50d | 2015-11-17 06:52:23 -0500 | [diff] [blame] | 46 | #include "trace.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 47 | |
| 48 | #define NFSDDBG_FACILITY NFSDDBG_FILEOP |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 49 | |
| 50 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 51 | /* |
| 52 | * This is a cache of readahead params that help us choose the proper |
| 53 | * readahead strategy. Initially, we set all readahead parameters to 0 |
| 54 | * and let the VFS handle things. |
| 55 | * If you increase the number of cached files very much, you'll need to |
| 56 | * add a hash table here. |
| 57 | */ |
| 58 | struct raparms { |
| 59 | struct raparms *p_next; |
| 60 | unsigned int p_count; |
| 61 | ino_t p_ino; |
| 62 | dev_t p_dev; |
| 63 | int p_set; |
| 64 | struct file_ra_state p_ra; |
Greg Banks | fce1456 | 2006-10-04 02:15:49 -0700 | [diff] [blame] | 65 | unsigned int p_hindex; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 66 | }; |
| 67 | |
Greg Banks | fce1456 | 2006-10-04 02:15:49 -0700 | [diff] [blame] | 68 | struct raparm_hbucket { |
| 69 | struct raparms *pb_head; |
| 70 | spinlock_t pb_lock; |
| 71 | } ____cacheline_aligned_in_smp; |
| 72 | |
Greg Banks | fce1456 | 2006-10-04 02:15:49 -0700 | [diff] [blame] | 73 | #define RAPARM_HASH_BITS 4 |
| 74 | #define RAPARM_HASH_SIZE (1<<RAPARM_HASH_BITS) |
| 75 | #define RAPARM_HASH_MASK (RAPARM_HASH_SIZE-1) |
| 76 | static struct raparm_hbucket raparm_hash[RAPARM_HASH_SIZE]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 77 | |
| 78 | /* |
| 79 | * Called from nfsd_lookup and encode_dirent. Check if we have crossed |
| 80 | * a mount point. |
J.Bruce Fields | e0bb89e | 2006-12-13 00:35:25 -0800 | [diff] [blame] | 81 | * Returns -EAGAIN or -ETIMEDOUT leaving *dpp and *expp unchanged, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 82 | * or nfs_ok having possibly changed *dpp and *expp |
| 83 | */ |
| 84 | int |
| 85 | nfsd_cross_mnt(struct svc_rqst *rqstp, struct dentry **dpp, |
| 86 | struct svc_export **expp) |
| 87 | { |
| 88 | struct svc_export *exp = *expp, *exp2 = NULL; |
| 89 | struct dentry *dentry = *dpp; |
Al Viro | 91c9fa8 | 2009-04-18 02:42:05 -0400 | [diff] [blame] | 90 | struct path path = {.mnt = mntget(exp->ex_path.mnt), |
| 91 | .dentry = dget(dentry)}; |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 92 | int err = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 93 | |
Al Viro | 7cc90cc | 2011-03-18 09:04:20 -0400 | [diff] [blame] | 94 | err = follow_down(&path); |
David Howells | cc53ce5 | 2011-01-14 18:45:26 +0000 | [diff] [blame] | 95 | if (err < 0) |
| 96 | goto out; |
NeilBrown | b5684e7 | 2017-03-15 12:40:44 +1100 | [diff] [blame] | 97 | if (path.mnt == exp->ex_path.mnt && path.dentry == dentry && |
| 98 | nfsd_mountpoint(dentry, exp) == 2) { |
| 99 | /* This is only a mountpoint in some other namespace */ |
| 100 | path_put(&path); |
| 101 | goto out; |
| 102 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 103 | |
Al Viro | 91c9fa8 | 2009-04-18 02:42:05 -0400 | [diff] [blame] | 104 | exp2 = rqst_exp_get_by_name(rqstp, &path); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 105 | if (IS_ERR(exp2)) { |
J. Bruce Fields | 3b6cee7bc | 2009-10-25 21:18:19 -0400 | [diff] [blame] | 106 | err = PTR_ERR(exp2); |
| 107 | /* |
| 108 | * We normally allow NFS clients to continue |
| 109 | * "underneath" a mountpoint that is not exported. |
| 110 | * The exception is V4ROOT, where no traversal is ever |
| 111 | * allowed without an explicit export of the new |
| 112 | * directory. |
| 113 | */ |
| 114 | if (err == -ENOENT && !(exp->ex_flags & NFSEXP_V4ROOT)) |
| 115 | err = 0; |
Al Viro | 91c9fa8 | 2009-04-18 02:42:05 -0400 | [diff] [blame] | 116 | path_put(&path); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 117 | goto out; |
| 118 | } |
Steve Dickson | 3c394dd | 2009-09-09 15:02:40 -0400 | [diff] [blame] | 119 | if (nfsd_v4client(rqstp) || |
| 120 | (exp->ex_flags & NFSEXP_CROSSMOUNT) || EX_NOHIDE(exp2)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 121 | /* successfully crossed mount point */ |
Al Viro | 1644ccc | 2009-04-18 02:32:31 -0400 | [diff] [blame] | 122 | /* |
Al Viro | 91c9fa8 | 2009-04-18 02:42:05 -0400 | [diff] [blame] | 123 | * This is subtle: path.dentry is *not* on path.mnt |
| 124 | * at this point. The only reason we are safe is that |
| 125 | * original mnt is pinned down by exp, so we should |
| 126 | * put path *before* putting exp |
Al Viro | 1644ccc | 2009-04-18 02:32:31 -0400 | [diff] [blame] | 127 | */ |
Al Viro | 91c9fa8 | 2009-04-18 02:42:05 -0400 | [diff] [blame] | 128 | *dpp = path.dentry; |
| 129 | path.dentry = dentry; |
Al Viro | 1644ccc | 2009-04-18 02:32:31 -0400 | [diff] [blame] | 130 | *expp = exp2; |
Al Viro | 91c9fa8 | 2009-04-18 02:42:05 -0400 | [diff] [blame] | 131 | exp2 = exp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 132 | } |
Al Viro | 91c9fa8 | 2009-04-18 02:42:05 -0400 | [diff] [blame] | 133 | path_put(&path); |
| 134 | exp_put(exp2); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 135 | out: |
| 136 | return err; |
| 137 | } |
| 138 | |
J. Bruce Fields | 289ede4 | 2009-09-26 20:32:24 -0400 | [diff] [blame] | 139 | static void follow_to_parent(struct path *path) |
| 140 | { |
| 141 | struct dentry *dp; |
| 142 | |
| 143 | while (path->dentry == path->mnt->mnt_root && follow_up(path)) |
| 144 | ; |
| 145 | dp = dget_parent(path->dentry); |
| 146 | dput(path->dentry); |
| 147 | path->dentry = dp; |
| 148 | } |
| 149 | |
| 150 | static int nfsd_lookup_parent(struct svc_rqst *rqstp, struct dentry *dparent, struct svc_export **exp, struct dentry **dentryp) |
| 151 | { |
| 152 | struct svc_export *exp2; |
| 153 | struct path path = {.mnt = mntget((*exp)->ex_path.mnt), |
| 154 | .dentry = dget(dparent)}; |
| 155 | |
| 156 | follow_to_parent(&path); |
| 157 | |
| 158 | exp2 = rqst_exp_parent(rqstp, &path); |
| 159 | if (PTR_ERR(exp2) == -ENOENT) { |
| 160 | *dentryp = dget(dparent); |
| 161 | } else if (IS_ERR(exp2)) { |
| 162 | path_put(&path); |
| 163 | return PTR_ERR(exp2); |
| 164 | } else { |
| 165 | *dentryp = dget(path.dentry); |
| 166 | exp_put(*exp); |
| 167 | *exp = exp2; |
| 168 | } |
| 169 | path_put(&path); |
| 170 | return 0; |
| 171 | } |
| 172 | |
J. Bruce Fields | 82ead7f | 2009-10-25 21:33:15 -0400 | [diff] [blame] | 173 | /* |
| 174 | * For nfsd purposes, we treat V4ROOT exports as though there was an |
| 175 | * export at *every* directory. |
NeilBrown | b5684e7 | 2017-03-15 12:40:44 +1100 | [diff] [blame] | 176 | * We return: |
| 177 | * '1' if this dentry *must* be an export point, |
| 178 | * '2' if it might be, if there is really a mount here, and |
| 179 | * '0' if there is no chance of an export point here. |
J. Bruce Fields | 82ead7f | 2009-10-25 21:33:15 -0400 | [diff] [blame] | 180 | */ |
J. Bruce Fields | 3227fa4 | 2009-10-25 21:43:01 -0400 | [diff] [blame] | 181 | int nfsd_mountpoint(struct dentry *dentry, struct svc_export *exp) |
J. Bruce Fields | 82ead7f | 2009-10-25 21:33:15 -0400 | [diff] [blame] | 182 | { |
NeilBrown | b5684e7 | 2017-03-15 12:40:44 +1100 | [diff] [blame] | 183 | if (!d_inode(dentry)) |
| 184 | return 0; |
| 185 | if (exp->ex_flags & NFSEXP_V4ROOT) |
J. Bruce Fields | 82ead7f | 2009-10-25 21:33:15 -0400 | [diff] [blame] | 186 | return 1; |
Trond Myklebust | 11fcee02 | 2011-09-12 19:37:26 -0400 | [diff] [blame] | 187 | if (nfsd4_is_junction(dentry)) |
| 188 | return 1; |
NeilBrown | b5684e7 | 2017-03-15 12:40:44 +1100 | [diff] [blame] | 189 | if (d_mountpoint(dentry)) |
| 190 | /* |
| 191 | * Might only be a mountpoint in a different namespace, |
| 192 | * but we need to check. |
| 193 | */ |
| 194 | return 2; |
| 195 | return 0; |
J. Bruce Fields | 82ead7f | 2009-10-25 21:33:15 -0400 | [diff] [blame] | 196 | } |
| 197 | |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 198 | __be32 |
J. Bruce Fields | 6c0a654 | 2007-07-17 04:04:47 -0700 | [diff] [blame] | 199 | nfsd_lookup_dentry(struct svc_rqst *rqstp, struct svc_fh *fhp, |
Chuck Lever | 5a022fc | 2007-11-01 16:57:09 -0400 | [diff] [blame] | 200 | const char *name, unsigned int len, |
J. Bruce Fields | 6c0a654 | 2007-07-17 04:04:47 -0700 | [diff] [blame] | 201 | struct svc_export **exp_ret, struct dentry **dentry_ret) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 202 | { |
| 203 | struct svc_export *exp; |
| 204 | struct dentry *dparent; |
| 205 | struct dentry *dentry; |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 206 | int host_err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 207 | |
| 208 | dprintk("nfsd: nfsd_lookup(fh %s, %.*s)\n", SVCFH_fmt(fhp), len,name); |
| 209 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 210 | dparent = fhp->fh_dentry; |
Kinglong Mee | bf18f16 | 2014-06-10 22:06:44 +0800 | [diff] [blame] | 211 | exp = exp_get(fhp->fh_export); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 212 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 213 | /* Lookup the name, but don't follow links */ |
| 214 | if (isdotent(name, len)) { |
| 215 | if (len==1) |
| 216 | dentry = dget(dparent); |
Jan Blunck | 5477549 | 2008-02-14 19:38:39 -0800 | [diff] [blame] | 217 | else if (dparent != exp->ex_path.dentry) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 218 | dentry = dget_parent(dparent); |
J. Bruce Fields | fed8381 | 2009-09-26 16:53:01 -0400 | [diff] [blame] | 219 | else if (!EX_NOHIDE(exp) && !nfsd_v4client(rqstp)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 220 | dentry = dget(dparent); /* .. == . just like at / */ |
| 221 | else { |
| 222 | /* checking mountpoint crossing is very different when stepping up */ |
J. Bruce Fields | 289ede4 | 2009-09-26 20:32:24 -0400 | [diff] [blame] | 223 | host_err = nfsd_lookup_parent(rqstp, dparent, &exp, &dentry); |
| 224 | if (host_err) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 225 | goto out_nfserr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 226 | } |
| 227 | } else { |
J. Bruce Fields | 4335723 | 2014-01-24 18:04:40 -0500 | [diff] [blame] | 228 | /* |
| 229 | * In the nfsd4_open() case, this may be held across |
| 230 | * subsequent open and delegation acquisition which may |
| 231 | * need to take the child's i_mutex: |
| 232 | */ |
| 233 | fh_lock_nested(fhp, I_MUTEX_PARENT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 234 | dentry = lookup_one_len(name, dparent, len); |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 235 | host_err = PTR_ERR(dentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 236 | if (IS_ERR(dentry)) |
| 237 | goto out_nfserr; |
J. Bruce Fields | 82ead7f | 2009-10-25 21:33:15 -0400 | [diff] [blame] | 238 | if (nfsd_mountpoint(dentry, exp)) { |
NeilBrown | bbddca8 | 2016-01-07 16:08:20 -0500 | [diff] [blame] | 239 | /* |
| 240 | * We don't need the i_mutex after all. It's |
| 241 | * still possible we could open this (regular |
| 242 | * files can be mountpoints too), but the |
| 243 | * i_mutex is just there to prevent renames of |
| 244 | * something that we might be about to delegate, |
| 245 | * and a mountpoint won't be renamed: |
| 246 | */ |
| 247 | fh_unlock(fhp); |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 248 | if ((host_err = nfsd_cross_mnt(rqstp, &dentry, &exp))) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 249 | dput(dentry); |
| 250 | goto out_nfserr; |
| 251 | } |
| 252 | } |
| 253 | } |
J. Bruce Fields | 6c0a654 | 2007-07-17 04:04:47 -0700 | [diff] [blame] | 254 | *dentry_ret = dentry; |
| 255 | *exp_ret = exp; |
| 256 | return 0; |
| 257 | |
| 258 | out_nfserr: |
| 259 | exp_put(exp); |
| 260 | return nfserrno(host_err); |
| 261 | } |
| 262 | |
| 263 | /* |
| 264 | * Look up one component of a pathname. |
| 265 | * N.B. After this call _both_ fhp and resfh need an fh_put |
| 266 | * |
| 267 | * If the lookup would cross a mountpoint, and the mounted filesystem |
| 268 | * is exported to the client with NFSEXP_NOHIDE, then the lookup is |
| 269 | * accepted as it stands and the mounted directory is |
| 270 | * returned. Otherwise the covered directory is returned. |
| 271 | * NOTE: this mountpoint crossing is not supported properly by all |
| 272 | * clients and is explicitly disallowed for NFSv3 |
| 273 | * NeilBrown <neilb@cse.unsw.edu.au> |
| 274 | */ |
| 275 | __be32 |
| 276 | 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] | 277 | unsigned int len, struct svc_fh *resfh) |
J. Bruce Fields | 6c0a654 | 2007-07-17 04:04:47 -0700 | [diff] [blame] | 278 | { |
| 279 | struct svc_export *exp; |
| 280 | struct dentry *dentry; |
| 281 | __be32 err; |
| 282 | |
J. Bruce Fields | 29a78a3 | 2011-04-09 11:28:53 -0400 | [diff] [blame] | 283 | err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_EXEC); |
| 284 | if (err) |
| 285 | return err; |
J. Bruce Fields | 6c0a654 | 2007-07-17 04:04:47 -0700 | [diff] [blame] | 286 | err = nfsd_lookup_dentry(rqstp, fhp, name, len, &exp, &dentry); |
| 287 | if (err) |
| 288 | return err; |
Andy Adamson | 32c1eb0 | 2007-07-17 04:04:48 -0700 | [diff] [blame] | 289 | err = check_nfsd_access(exp, rqstp); |
| 290 | if (err) |
| 291 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 292 | /* |
| 293 | * Note: we compose the file handle now, but as the |
| 294 | * dentry may be negative, it may need to be updated. |
| 295 | */ |
| 296 | err = fh_compose(resfh, exp, dentry, fhp); |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 297 | if (!err && d_really_is_negative(dentry)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 298 | err = nfserr_noent; |
Andy Adamson | 32c1eb0 | 2007-07-17 04:04:48 -0700 | [diff] [blame] | 299 | out: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 300 | dput(dentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 301 | exp_put(exp); |
| 302 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 303 | } |
| 304 | |
Ben Myers | f501912 | 2010-02-17 14:05:11 -0600 | [diff] [blame] | 305 | /* |
| 306 | * Commit metadata changes to stable storage. |
| 307 | */ |
| 308 | static int |
| 309 | commit_metadata(struct svc_fh *fhp) |
| 310 | { |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 311 | struct inode *inode = d_inode(fhp->fh_dentry); |
Ben Myers | f501912 | 2010-02-17 14:05:11 -0600 | [diff] [blame] | 312 | const struct export_operations *export_ops = inode->i_sb->s_export_op; |
Ben Myers | f501912 | 2010-02-17 14:05:11 -0600 | [diff] [blame] | 313 | |
| 314 | if (!EX_ISSYNC(fhp->fh_export)) |
| 315 | return 0; |
| 316 | |
Christoph Hellwig | c3765016 | 2010-10-06 10:48:20 +0200 | [diff] [blame] | 317 | if (export_ops->commit_metadata) |
| 318 | return export_ops->commit_metadata(inode); |
| 319 | return sync_inode_metadata(inode, 1); |
Ben Myers | f501912 | 2010-02-17 14:05:11 -0600 | [diff] [blame] | 320 | } |
J. Bruce Fields | 6c0a654 | 2007-07-17 04:04:47 -0700 | [diff] [blame] | 321 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 322 | /* |
Christoph Hellwig | 818e5a2 | 2013-11-18 05:07:30 -0800 | [diff] [blame] | 323 | * Go over the attributes and take care of the small differences between |
| 324 | * NFS semantics and what Linux expects. |
| 325 | */ |
| 326 | static void |
| 327 | nfsd_sanitize_attrs(struct inode *inode, struct iattr *iap) |
| 328 | { |
Christoph Hellwig | 818e5a2 | 2013-11-18 05:07:30 -0800 | [diff] [blame] | 329 | /* sanitize the mode change */ |
| 330 | if (iap->ia_valid & ATTR_MODE) { |
| 331 | iap->ia_mode &= S_IALLUGO; |
| 332 | iap->ia_mode |= (inode->i_mode & ~S_IALLUGO); |
| 333 | } |
| 334 | |
| 335 | /* Revoke setuid/setgid on chown */ |
| 336 | if (!S_ISDIR(inode->i_mode) && |
Stanislav Kholmanskikh | c4fa6d7 | 2013-12-11 14:16:36 +0400 | [diff] [blame] | 337 | ((iap->ia_valid & ATTR_UID) || (iap->ia_valid & ATTR_GID))) { |
Christoph Hellwig | 818e5a2 | 2013-11-18 05:07:30 -0800 | [diff] [blame] | 338 | iap->ia_valid |= ATTR_KILL_PRIV; |
| 339 | if (iap->ia_valid & ATTR_MODE) { |
| 340 | /* we're setting mode too, just clear the s*id bits */ |
| 341 | iap->ia_mode &= ~S_ISUID; |
| 342 | if (iap->ia_mode & S_IXGRP) |
| 343 | iap->ia_mode &= ~S_ISGID; |
| 344 | } else { |
| 345 | /* set ATTR_KILL_* bits and let VFS handle it */ |
| 346 | iap->ia_valid |= (ATTR_KILL_SUID | ATTR_KILL_SGID); |
| 347 | } |
| 348 | } |
| 349 | } |
| 350 | |
| 351 | static __be32 |
| 352 | nfsd_get_write_access(struct svc_rqst *rqstp, struct svc_fh *fhp, |
| 353 | struct iattr *iap) |
| 354 | { |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 355 | struct inode *inode = d_inode(fhp->fh_dentry); |
Christoph Hellwig | 818e5a2 | 2013-11-18 05:07:30 -0800 | [diff] [blame] | 356 | int host_err; |
| 357 | |
| 358 | if (iap->ia_size < inode->i_size) { |
| 359 | __be32 err; |
| 360 | |
| 361 | err = nfsd_permission(rqstp, fhp->fh_export, fhp->fh_dentry, |
| 362 | NFSD_MAY_TRUNC | NFSD_MAY_OWNER_OVERRIDE); |
| 363 | if (err) |
| 364 | return err; |
| 365 | } |
| 366 | |
| 367 | host_err = get_write_access(inode); |
| 368 | if (host_err) |
| 369 | goto out_nfserrno; |
| 370 | |
| 371 | host_err = locks_verify_truncate(inode, NULL, iap->ia_size); |
| 372 | if (host_err) |
| 373 | goto out_put_write_access; |
| 374 | return 0; |
| 375 | |
| 376 | out_put_write_access: |
| 377 | put_write_access(inode); |
| 378 | out_nfserrno: |
| 379 | return nfserrno(host_err); |
| 380 | } |
| 381 | |
| 382 | /* |
| 383 | * Set various file attributes. After this call fhp needs an fh_put. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 384 | */ |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 385 | __be32 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 386 | nfsd_setattr(struct svc_rqst *rqstp, struct svc_fh *fhp, struct iattr *iap, |
| 387 | int check_guard, time_t guardtime) |
| 388 | { |
| 389 | struct dentry *dentry; |
| 390 | struct inode *inode; |
Miklos Szeredi | 8837abc | 2008-06-16 13:20:29 +0200 | [diff] [blame] | 391 | int accmode = NFSD_MAY_SATTR; |
Al Viro | 175a4eb | 2011-07-26 03:30:54 -0400 | [diff] [blame] | 392 | umode_t ftype = 0; |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 393 | __be32 err; |
| 394 | int host_err; |
J. Bruce Fields | 9f67f18 | 2014-02-24 14:59:47 -0500 | [diff] [blame] | 395 | bool get_write_count; |
Christoph Hellwig | 9bdd39c | 2017-02-20 17:04:42 -0500 | [diff] [blame] | 396 | bool size_change = (iap->ia_valid & ATTR_SIZE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 397 | |
zhengbin | 25a4797 | 2018-11-30 16:04:25 +0800 | [diff] [blame] | 398 | if (iap->ia_valid & ATTR_SIZE) { |
Miklos Szeredi | 8837abc | 2008-06-16 13:20:29 +0200 | [diff] [blame] | 399 | accmode |= NFSD_MAY_WRITE|NFSD_MAY_OWNER_OVERRIDE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 400 | ftype = S_IFREG; |
zhengbin | 25a4797 | 2018-11-30 16:04:25 +0800 | [diff] [blame] | 401 | } |
| 402 | |
| 403 | /* |
| 404 | * If utimes(2) and friends are called with times not NULL, we should |
| 405 | * not set NFSD_MAY_WRITE bit. Otherwise fh_verify->nfsd_permission |
| 406 | * will return EACCESS, when the caller's effective UID does not match |
| 407 | * the owner of the file, and the caller is not privileged. In this |
| 408 | * situation, we should return EPERM(notify_change will return this). |
| 409 | */ |
| 410 | if (iap->ia_valid & (ATTR_ATIME | ATTR_MTIME)) { |
| 411 | accmode |= NFSD_MAY_OWNER_OVERRIDE; |
| 412 | if (!(iap->ia_valid & (ATTR_ATIME_SET | ATTR_MTIME_SET))) |
| 413 | accmode |= NFSD_MAY_WRITE; |
| 414 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 415 | |
J. Bruce Fields | 9f67f18 | 2014-02-24 14:59:47 -0500 | [diff] [blame] | 416 | /* Callers that do fh_verify should do the fh_want_write: */ |
| 417 | get_write_count = !fhp->fh_dentry; |
| 418 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 419 | /* Get inode */ |
| 420 | err = fh_verify(rqstp, fhp, ftype, accmode); |
NeilBrown | 15b7a1b | 2005-11-07 01:00:23 -0800 | [diff] [blame] | 421 | if (err) |
Christoph Hellwig | 9bdd39c | 2017-02-20 17:04:42 -0500 | [diff] [blame] | 422 | return err; |
J. Bruce Fields | 9f67f18 | 2014-02-24 14:59:47 -0500 | [diff] [blame] | 423 | if (get_write_count) { |
| 424 | host_err = fh_want_write(fhp); |
| 425 | if (host_err) |
Christoph Hellwig | 9bdd39c | 2017-02-20 17:04:42 -0500 | [diff] [blame] | 426 | goto out; |
J. Bruce Fields | 9f67f18 | 2014-02-24 14:59:47 -0500 | [diff] [blame] | 427 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 428 | |
| 429 | dentry = fhp->fh_dentry; |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 430 | inode = d_inode(dentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 431 | |
NeilBrown | 15b7a1b | 2005-11-07 01:00:23 -0800 | [diff] [blame] | 432 | /* Ignore any mode updates on symlinks */ |
| 433 | if (S_ISLNK(inode->i_mode)) |
| 434 | iap->ia_valid &= ~ATTR_MODE; |
| 435 | |
| 436 | if (!iap->ia_valid) |
Christoph Hellwig | 9bdd39c | 2017-02-20 17:04:42 -0500 | [diff] [blame] | 437 | return 0; |
NeilBrown | 15b7a1b | 2005-11-07 01:00:23 -0800 | [diff] [blame] | 438 | |
Christoph Hellwig | 818e5a2 | 2013-11-18 05:07:30 -0800 | [diff] [blame] | 439 | nfsd_sanitize_attrs(inode, iap); |
| 440 | |
Christoph Hellwig | 9bdd39c | 2017-02-20 17:04:42 -0500 | [diff] [blame] | 441 | if (check_guard && guardtime != inode->i_ctime.tv_sec) |
| 442 | return nfserr_notsync; |
| 443 | |
Christoph Hellwig | 9c85fca | 2007-03-07 15:26:25 +0000 | [diff] [blame] | 444 | /* |
Christoph Hellwig | 818e5a2 | 2013-11-18 05:07:30 -0800 | [diff] [blame] | 445 | * The size case is special, it changes the file in addition to the |
Christoph Hellwig | a3c6cbc | 2017-02-20 07:21:33 +0100 | [diff] [blame] | 446 | * attributes, and file systems don't expect it to be mixed with |
| 447 | * "random" attribute changes. We thus split out the size change |
| 448 | * into a separate call to ->setattr, and do the rest as a separate |
| 449 | * setattr call. |
Christoph Hellwig | 9c85fca | 2007-03-07 15:26:25 +0000 | [diff] [blame] | 450 | */ |
Christoph Hellwig | 9bdd39c | 2017-02-20 17:04:42 -0500 | [diff] [blame] | 451 | if (size_change) { |
Christoph Hellwig | 818e5a2 | 2013-11-18 05:07:30 -0800 | [diff] [blame] | 452 | err = nfsd_get_write_access(rqstp, fhp, iap); |
| 453 | if (err) |
Christoph Hellwig | 9bdd39c | 2017-02-20 17:04:42 -0500 | [diff] [blame] | 454 | return err; |
Christoph Hellwig | a3c6cbc | 2017-02-20 07:21:33 +0100 | [diff] [blame] | 455 | } |
Christoph Hellwig | f0c6312 | 2014-09-07 12:15:52 -0700 | [diff] [blame] | 456 | |
Christoph Hellwig | a3c6cbc | 2017-02-20 07:21:33 +0100 | [diff] [blame] | 457 | fh_lock(fhp); |
| 458 | if (size_change) { |
Christoph Hellwig | f0c6312 | 2014-09-07 12:15:52 -0700 | [diff] [blame] | 459 | /* |
| 460 | * RFC5661, Section 18.30.4: |
| 461 | * Changing the size of a file with SETATTR indirectly |
| 462 | * changes the time_modify and change attributes. |
| 463 | * |
| 464 | * (and similar for the older RFCs) |
| 465 | */ |
Christoph Hellwig | a3c6cbc | 2017-02-20 07:21:33 +0100 | [diff] [blame] | 466 | struct iattr size_attr = { |
| 467 | .ia_valid = ATTR_SIZE | ATTR_CTIME | ATTR_MTIME, |
| 468 | .ia_size = iap->ia_size, |
| 469 | }; |
| 470 | |
| 471 | host_err = notify_change(dentry, &size_attr, NULL); |
| 472 | if (host_err) |
| 473 | goto out_unlock; |
| 474 | iap->ia_valid &= ~ATTR_SIZE; |
| 475 | |
| 476 | /* |
| 477 | * Avoid the additional setattr call below if the only other |
| 478 | * attribute that the client sends is the mtime, as we update |
| 479 | * it as part of the size change above. |
| 480 | */ |
| 481 | if ((iap->ia_valid & ~ATTR_MTIME) == 0) |
| 482 | goto out_unlock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 483 | } |
| 484 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 485 | iap->ia_valid |= ATTR_CTIME; |
Christoph Hellwig | 987da47 | 2013-11-18 05:07:47 -0800 | [diff] [blame] | 486 | host_err = notify_change(dentry, iap, NULL); |
Christoph Hellwig | 987da47 | 2013-11-18 05:07:47 -0800 | [diff] [blame] | 487 | |
Christoph Hellwig | a3c6cbc | 2017-02-20 07:21:33 +0100 | [diff] [blame] | 488 | out_unlock: |
| 489 | fh_unlock(fhp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 490 | if (size_change) |
| 491 | put_write_access(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 492 | out: |
Christoph Hellwig | 9bdd39c | 2017-02-20 17:04:42 -0500 | [diff] [blame] | 493 | if (!host_err) |
| 494 | host_err = commit_metadata(fhp); |
| 495 | return nfserrno(host_err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 496 | } |
| 497 | |
Christoph Hellwig | 5be196e | 2006-01-09 20:51:55 -0800 | [diff] [blame] | 498 | #if defined(CONFIG_NFSD_V4) |
Chuck Lever | 9b4146e | 2012-01-04 16:26:43 -0500 | [diff] [blame] | 499 | /* |
| 500 | * NFS junction information is stored in an extended attribute. |
| 501 | */ |
| 502 | #define NFSD_JUNCTION_XATTR_NAME XATTR_TRUSTED_PREFIX "junction.nfs" |
| 503 | |
| 504 | /** |
| 505 | * nfsd4_is_junction - Test if an object could be an NFS junction |
| 506 | * |
| 507 | * @dentry: object to test |
| 508 | * |
| 509 | * Returns 1 if "dentry" appears to contain NFS junction information. |
| 510 | * Otherwise 0 is returned. |
| 511 | */ |
Trond Myklebust | 11fcee02 | 2011-09-12 19:37:26 -0400 | [diff] [blame] | 512 | int nfsd4_is_junction(struct dentry *dentry) |
| 513 | { |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 514 | struct inode *inode = d_inode(dentry); |
Trond Myklebust | 11fcee02 | 2011-09-12 19:37:26 -0400 | [diff] [blame] | 515 | |
| 516 | if (inode == NULL) |
| 517 | return 0; |
| 518 | if (inode->i_mode & S_IXUGO) |
| 519 | return 0; |
| 520 | if (!(inode->i_mode & S_ISVTX)) |
| 521 | return 0; |
Chuck Lever | 9b4146e | 2012-01-04 16:26:43 -0500 | [diff] [blame] | 522 | if (vfs_getxattr(dentry, NFSD_JUNCTION_XATTR_NAME, NULL, 0) <= 0) |
Trond Myklebust | 11fcee02 | 2011-09-12 19:37:26 -0400 | [diff] [blame] | 523 | return 0; |
| 524 | return 1; |
| 525 | } |
David Quigley | 18032ca | 2013-05-02 13:19:10 -0400 | [diff] [blame] | 526 | #ifdef CONFIG_NFSD_V4_SECURITY_LABEL |
| 527 | __be32 nfsd4_set_nfs4_label(struct svc_rqst *rqstp, struct svc_fh *fhp, |
| 528 | struct xdr_netobj *label) |
| 529 | { |
| 530 | __be32 error; |
| 531 | int host_error; |
| 532 | struct dentry *dentry; |
| 533 | |
| 534 | error = fh_verify(rqstp, fhp, 0 /* S_IFREG */, NFSD_MAY_SATTR); |
| 535 | if (error) |
| 536 | return error; |
| 537 | |
| 538 | dentry = fhp->fh_dentry; |
| 539 | |
Al Viro | 5955102 | 2016-01-22 15:40:57 -0500 | [diff] [blame] | 540 | inode_lock(d_inode(dentry)); |
David Quigley | 18032ca | 2013-05-02 13:19:10 -0400 | [diff] [blame] | 541 | host_error = security_inode_setsecctx(dentry, label->data, label->len); |
Al Viro | 5955102 | 2016-01-22 15:40:57 -0500 | [diff] [blame] | 542 | inode_unlock(d_inode(dentry)); |
David Quigley | 18032ca | 2013-05-02 13:19:10 -0400 | [diff] [blame] | 543 | return nfserrno(host_error); |
| 544 | } |
| 545 | #else |
| 546 | __be32 nfsd4_set_nfs4_label(struct svc_rqst *rqstp, struct svc_fh *fhp, |
| 547 | struct xdr_netobj *label) |
| 548 | { |
| 549 | return nfserr_notsupp; |
| 550 | } |
| 551 | #endif |
| 552 | |
Christoph Hellwig | ffa0160 | 2015-12-03 12:59:52 +0100 | [diff] [blame] | 553 | __be32 nfsd4_clone_file_range(struct file *src, u64 src_pos, struct file *dst, |
| 554 | u64 dst_pos, u64 count) |
| 555 | { |
| 556 | return nfserrno(vfs_clone_file_range(src, src_pos, dst, dst_pos, |
| 557 | count)); |
| 558 | } |
| 559 | |
Anna Schumaker | 29ae7f9 | 2016-09-07 15:57:30 -0400 | [diff] [blame] | 560 | ssize_t nfsd_copy_file_range(struct file *src, u64 src_pos, struct file *dst, |
| 561 | u64 dst_pos, u64 count) |
| 562 | { |
| 563 | |
| 564 | /* |
| 565 | * Limit copy to 4MB to prevent indefinitely blocking an nfsd |
| 566 | * thread and client rpc slot. The choice of 4MB is somewhat |
| 567 | * arbitrary. We might instead base this on r/wsize, or make it |
| 568 | * tunable, or use a time instead of a byte limit, or implement |
| 569 | * asynchronous copy. In theory a client could also recognize a |
| 570 | * limit like this and pipeline multiple COPY requests. |
| 571 | */ |
| 572 | count = min_t(u64, count, 1 << 22); |
| 573 | return vfs_copy_file_range(src, src_pos, dst, dst_pos, count, 0); |
| 574 | } |
| 575 | |
Anna Schumaker | 95d871f | 2014-11-07 14:44:26 -0500 | [diff] [blame] | 576 | __be32 nfsd4_vfs_fallocate(struct svc_rqst *rqstp, struct svc_fh *fhp, |
| 577 | struct file *file, loff_t offset, loff_t len, |
| 578 | int flags) |
| 579 | { |
Anna Schumaker | 95d871f | 2014-11-07 14:44:26 -0500 | [diff] [blame] | 580 | int error; |
| 581 | |
| 582 | if (!S_ISREG(file_inode(file)->i_mode)) |
| 583 | return nfserr_inval; |
| 584 | |
Anna Schumaker | 95d871f | 2014-11-07 14:44:26 -0500 | [diff] [blame] | 585 | error = vfs_fallocate(file, flags, offset, len); |
| 586 | if (!error) |
| 587 | error = commit_metadata(fhp); |
| 588 | |
| 589 | return nfserrno(error); |
| 590 | } |
J. Bruce Fields | 6a85d6c | 2010-07-06 12:39:12 -0400 | [diff] [blame] | 591 | #endif /* defined(CONFIG_NFSD_V4) */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 592 | |
| 593 | #ifdef CONFIG_NFSD_V3 |
| 594 | /* |
| 595 | * Check server access rights to a file system object |
| 596 | */ |
| 597 | struct accessmap { |
| 598 | u32 access; |
| 599 | int how; |
| 600 | }; |
| 601 | static struct accessmap nfs3_regaccess[] = { |
Miklos Szeredi | 8837abc | 2008-06-16 13:20:29 +0200 | [diff] [blame] | 602 | { NFS3_ACCESS_READ, NFSD_MAY_READ }, |
| 603 | { NFS3_ACCESS_EXECUTE, NFSD_MAY_EXEC }, |
| 604 | { NFS3_ACCESS_MODIFY, NFSD_MAY_WRITE|NFSD_MAY_TRUNC }, |
| 605 | { NFS3_ACCESS_EXTEND, NFSD_MAY_WRITE }, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 606 | |
| 607 | { 0, 0 } |
| 608 | }; |
| 609 | |
| 610 | static struct accessmap nfs3_diraccess[] = { |
Miklos Szeredi | 8837abc | 2008-06-16 13:20:29 +0200 | [diff] [blame] | 611 | { NFS3_ACCESS_READ, NFSD_MAY_READ }, |
| 612 | { NFS3_ACCESS_LOOKUP, NFSD_MAY_EXEC }, |
| 613 | { NFS3_ACCESS_MODIFY, NFSD_MAY_EXEC|NFSD_MAY_WRITE|NFSD_MAY_TRUNC}, |
| 614 | { NFS3_ACCESS_EXTEND, NFSD_MAY_EXEC|NFSD_MAY_WRITE }, |
| 615 | { NFS3_ACCESS_DELETE, NFSD_MAY_REMOVE }, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 616 | |
| 617 | { 0, 0 } |
| 618 | }; |
| 619 | |
| 620 | static struct accessmap nfs3_anyaccess[] = { |
| 621 | /* Some clients - Solaris 2.6 at least, make an access call |
| 622 | * to the server to check for access for things like /dev/null |
| 623 | * (which really, the server doesn't care about). So |
| 624 | * We provide simple access checking for them, looking |
| 625 | * mainly at mode bits, and we make sure to ignore read-only |
| 626 | * filesystem checks |
| 627 | */ |
Miklos Szeredi | 8837abc | 2008-06-16 13:20:29 +0200 | [diff] [blame] | 628 | { NFS3_ACCESS_READ, NFSD_MAY_READ }, |
| 629 | { NFS3_ACCESS_EXECUTE, NFSD_MAY_EXEC }, |
| 630 | { NFS3_ACCESS_MODIFY, NFSD_MAY_WRITE|NFSD_MAY_LOCAL_ACCESS }, |
| 631 | { NFS3_ACCESS_EXTEND, NFSD_MAY_WRITE|NFSD_MAY_LOCAL_ACCESS }, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 632 | |
| 633 | { 0, 0 } |
| 634 | }; |
| 635 | |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 636 | __be32 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 637 | nfsd_access(struct svc_rqst *rqstp, struct svc_fh *fhp, u32 *access, u32 *supported) |
| 638 | { |
| 639 | struct accessmap *map; |
| 640 | struct svc_export *export; |
| 641 | struct dentry *dentry; |
| 642 | u32 query, result = 0, sresult = 0; |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 643 | __be32 error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 644 | |
Miklos Szeredi | 8837abc | 2008-06-16 13:20:29 +0200 | [diff] [blame] | 645 | error = fh_verify(rqstp, fhp, 0, NFSD_MAY_NOP); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 646 | if (error) |
| 647 | goto out; |
| 648 | |
| 649 | export = fhp->fh_export; |
| 650 | dentry = fhp->fh_dentry; |
| 651 | |
David Howells | e36cb0b | 2015-01-29 12:02:35 +0000 | [diff] [blame] | 652 | if (d_is_reg(dentry)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 653 | map = nfs3_regaccess; |
David Howells | e36cb0b | 2015-01-29 12:02:35 +0000 | [diff] [blame] | 654 | else if (d_is_dir(dentry)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 655 | map = nfs3_diraccess; |
| 656 | else |
| 657 | map = nfs3_anyaccess; |
| 658 | |
| 659 | |
| 660 | query = *access; |
| 661 | for (; map->access; map++) { |
| 662 | if (map->access & query) { |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 663 | __be32 err2; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 664 | |
| 665 | sresult |= map->access; |
| 666 | |
J. Bruce Fields | 0ec757d | 2007-07-17 04:04:48 -0700 | [diff] [blame] | 667 | err2 = nfsd_permission(rqstp, export, dentry, map->how); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 668 | switch (err2) { |
| 669 | case nfs_ok: |
| 670 | result |= map->access; |
| 671 | break; |
| 672 | |
| 673 | /* the following error codes just mean the access was not allowed, |
| 674 | * rather than an error occurred */ |
| 675 | case nfserr_rofs: |
| 676 | case nfserr_acces: |
| 677 | case nfserr_perm: |
| 678 | /* simply don't "or" in the access bit. */ |
| 679 | break; |
| 680 | default: |
| 681 | error = err2; |
| 682 | goto out; |
| 683 | } |
| 684 | } |
| 685 | } |
| 686 | *access = result; |
| 687 | if (supported) |
| 688 | *supported = sresult; |
| 689 | |
| 690 | out: |
| 691 | return error; |
| 692 | } |
| 693 | #endif /* CONFIG_NFSD_V3 */ |
| 694 | |
J. Bruce Fields | 105f462 | 2011-06-07 11:50:23 -0400 | [diff] [blame] | 695 | static int nfsd_open_break_lease(struct inode *inode, int access) |
| 696 | { |
| 697 | unsigned int mode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 698 | |
J. Bruce Fields | 105f462 | 2011-06-07 11:50:23 -0400 | [diff] [blame] | 699 | if (access & NFSD_MAY_NOT_BREAK_LEASE) |
| 700 | return 0; |
| 701 | mode = (access & NFSD_MAY_WRITE) ? O_WRONLY : O_RDONLY; |
| 702 | return break_lease(inode, mode | O_NONBLOCK); |
| 703 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 704 | |
| 705 | /* |
| 706 | * Open an existing file or directory. |
Bernd Schubert | 999448a | 2012-03-18 22:44:49 -0400 | [diff] [blame] | 707 | * The may_flags argument indicates the type of open (read/write/lock) |
| 708 | * and additional flags. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 709 | * N.B. After this call fhp needs an fh_put |
| 710 | */ |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 711 | __be32 |
Al Viro | 175a4eb | 2011-07-26 03:30:54 -0400 | [diff] [blame] | 712 | 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] | 713 | int may_flags, struct file **filp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 714 | { |
Al Viro | 765927b | 2012-06-26 21:58:53 +0400 | [diff] [blame] | 715 | struct path path; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 716 | struct inode *inode; |
Kinglong Mee | 8519f99 | 2014-09-03 08:14:06 +0800 | [diff] [blame] | 717 | struct file *file; |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 718 | int flags = O_RDONLY|O_LARGEFILE; |
| 719 | __be32 err; |
Jeff Layton | 9188525 | 2010-03-19 08:06:28 -0400 | [diff] [blame] | 720 | int host_err = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 721 | |
David Howells | e0e8173 | 2009-09-02 09:13:40 +0100 | [diff] [blame] | 722 | validate_process_creds(); |
| 723 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 724 | /* |
| 725 | * If we get here, then the client has already done an "open", |
| 726 | * and (hopefully) checked permission - so allow OWNER_OVERRIDE |
| 727 | * in case a chmod has now revoked permission. |
J. Bruce Fields | d91d0b5 | 2012-06-06 12:12:57 -0400 | [diff] [blame] | 728 | * |
| 729 | * Arguably we should also allow the owner override for |
| 730 | * directories, but we never have and it doesn't seem to have |
| 731 | * caused anyone a problem. If we were to change this, note |
| 732 | * also that our filldir callbacks would need a variant of |
| 733 | * lookup_one_len that doesn't check permissions. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 734 | */ |
J. Bruce Fields | d91d0b5 | 2012-06-06 12:12:57 -0400 | [diff] [blame] | 735 | if (type == S_IFREG) |
| 736 | may_flags |= NFSD_MAY_OWNER_OVERRIDE; |
| 737 | err = fh_verify(rqstp, fhp, type, may_flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 738 | if (err) |
| 739 | goto out; |
| 740 | |
Al Viro | 765927b | 2012-06-26 21:58:53 +0400 | [diff] [blame] | 741 | path.mnt = fhp->fh_export->ex_path.mnt; |
| 742 | path.dentry = fhp->fh_dentry; |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 743 | inode = d_inode(path.dentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 744 | |
| 745 | /* Disallow write access to files with the append-only bit set |
| 746 | * or any access when mandatory locking enabled |
| 747 | */ |
| 748 | err = nfserr_perm; |
Bernd Schubert | 999448a | 2012-03-18 22:44:49 -0400 | [diff] [blame] | 749 | if (IS_APPEND(inode) && (may_flags & NFSD_MAY_WRITE)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 750 | goto out; |
J. Bruce Fields | 5e7fc43 | 2007-10-02 14:18:12 -0400 | [diff] [blame] | 751 | /* |
| 752 | * We must ignore files (but only files) which might have mandatory |
| 753 | * locks on them because there is no way to know if the accesser has |
| 754 | * the lock. |
| 755 | */ |
| 756 | if (S_ISREG((inode)->i_mode) && mandatory_lock(inode)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 757 | goto out; |
| 758 | |
| 759 | if (!inode->i_fop) |
| 760 | goto out; |
| 761 | |
Bernd Schubert | 999448a | 2012-03-18 22:44:49 -0400 | [diff] [blame] | 762 | host_err = nfsd_open_break_lease(inode, may_flags); |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 763 | if (host_err) /* NOMEM or WOULDBLOCK */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 764 | goto out_nfserr; |
| 765 | |
Bernd Schubert | 999448a | 2012-03-18 22:44:49 -0400 | [diff] [blame] | 766 | if (may_flags & NFSD_MAY_WRITE) { |
| 767 | if (may_flags & NFSD_MAY_READ) |
J. Bruce Fields | 9ecb6a0 | 2006-06-30 01:56:17 -0700 | [diff] [blame] | 768 | flags = O_RDWR|O_LARGEFILE; |
| 769 | else |
| 770 | flags = O_WRONLY|O_LARGEFILE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 771 | } |
Bernd Schubert | 999448a | 2012-03-18 22:44:49 -0400 | [diff] [blame] | 772 | |
Kinglong Mee | 8519f99 | 2014-09-03 08:14:06 +0800 | [diff] [blame] | 773 | file = dentry_open(&path, flags, current_cred()); |
| 774 | if (IS_ERR(file)) { |
| 775 | host_err = PTR_ERR(file); |
| 776 | goto out_nfserr; |
Bernd Schubert | 06effdb | 2012-03-18 22:44:50 -0400 | [diff] [blame] | 777 | } |
| 778 | |
Linus Torvalds | 5e40d33 | 2014-10-12 10:13:55 -0400 | [diff] [blame] | 779 | host_err = ima_file_check(file, may_flags, 0); |
Kinglong Mee | 8519f99 | 2014-09-03 08:14:06 +0800 | [diff] [blame] | 780 | if (host_err) { |
Christoph Hellwig | fd89145 | 2015-04-28 15:41:16 +0200 | [diff] [blame] | 781 | fput(file); |
Kinglong Mee | 8519f99 | 2014-09-03 08:14:06 +0800 | [diff] [blame] | 782 | goto out_nfserr; |
| 783 | } |
| 784 | |
| 785 | if (may_flags & NFSD_MAY_64BIT_COOKIE) |
| 786 | file->f_mode |= FMODE_64BITHASH; |
| 787 | else |
| 788 | file->f_mode |= FMODE_32BITHASH; |
| 789 | |
| 790 | *filp = file; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 791 | out_nfserr: |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 792 | err = nfserrno(host_err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 793 | out: |
David Howells | e0e8173 | 2009-09-02 09:13:40 +0100 | [diff] [blame] | 794 | validate_process_creds(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 795 | return err; |
| 796 | } |
| 797 | |
Christoph Hellwig | e749a46 | 2015-06-18 16:44:58 +0200 | [diff] [blame] | 798 | struct raparms * |
| 799 | nfsd_init_raparms(struct file *file) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 800 | { |
Christoph Hellwig | e749a46 | 2015-06-18 16:44:58 +0200 | [diff] [blame] | 801 | struct inode *inode = file_inode(file); |
| 802 | dev_t dev = inode->i_sb->s_dev; |
| 803 | ino_t ino = inode->i_ino; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 804 | struct raparms *ra, **rap, **frap = NULL; |
| 805 | int depth = 0; |
Greg Banks | fce1456 | 2006-10-04 02:15:49 -0700 | [diff] [blame] | 806 | unsigned int hash; |
| 807 | struct raparm_hbucket *rab; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 808 | |
Greg Banks | fce1456 | 2006-10-04 02:15:49 -0700 | [diff] [blame] | 809 | hash = jhash_2words(dev, ino, 0xfeedbeef) & RAPARM_HASH_MASK; |
| 810 | rab = &raparm_hash[hash]; |
| 811 | |
| 812 | spin_lock(&rab->pb_lock); |
| 813 | for (rap = &rab->pb_head; (ra = *rap); rap = &ra->p_next) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 814 | if (ra->p_ino == ino && ra->p_dev == dev) |
| 815 | goto found; |
| 816 | depth++; |
| 817 | if (ra->p_count == 0) |
| 818 | frap = rap; |
| 819 | } |
Konstantin Khorenko | 3aa6e0a | 2011-02-01 17:16:29 +0300 | [diff] [blame] | 820 | depth = nfsdstats.ra_size; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 821 | if (!frap) { |
Greg Banks | fce1456 | 2006-10-04 02:15:49 -0700 | [diff] [blame] | 822 | spin_unlock(&rab->pb_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 823 | return NULL; |
| 824 | } |
| 825 | rap = frap; |
| 826 | ra = *frap; |
| 827 | ra->p_dev = dev; |
| 828 | ra->p_ino = ino; |
| 829 | ra->p_set = 0; |
Greg Banks | fce1456 | 2006-10-04 02:15:49 -0700 | [diff] [blame] | 830 | ra->p_hindex = hash; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 831 | found: |
Greg Banks | fce1456 | 2006-10-04 02:15:49 -0700 | [diff] [blame] | 832 | if (rap != &rab->pb_head) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 833 | *rap = ra->p_next; |
Greg Banks | fce1456 | 2006-10-04 02:15:49 -0700 | [diff] [blame] | 834 | ra->p_next = rab->pb_head; |
| 835 | rab->pb_head = ra; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 836 | } |
| 837 | ra->p_count++; |
| 838 | nfsdstats.ra_depth[depth*10/nfsdstats.ra_size]++; |
Greg Banks | fce1456 | 2006-10-04 02:15:49 -0700 | [diff] [blame] | 839 | spin_unlock(&rab->pb_lock); |
Christoph Hellwig | e749a46 | 2015-06-18 16:44:58 +0200 | [diff] [blame] | 840 | |
| 841 | if (ra->p_set) |
| 842 | file->f_ra = ra->p_ra; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 843 | return ra; |
| 844 | } |
| 845 | |
Christoph Hellwig | e749a46 | 2015-06-18 16:44:58 +0200 | [diff] [blame] | 846 | void nfsd_put_raparams(struct file *file, struct raparms *ra) |
| 847 | { |
| 848 | struct raparm_hbucket *rab = &raparm_hash[ra->p_hindex]; |
| 849 | |
| 850 | spin_lock(&rab->pb_lock); |
| 851 | ra->p_ra = file->f_ra; |
| 852 | ra->p_set = 1; |
| 853 | ra->p_count--; |
| 854 | spin_unlock(&rab->pb_lock); |
| 855 | } |
| 856 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 857 | /* |
Jens Axboe | cf8208d | 2007-06-12 21:22:14 +0200 | [diff] [blame] | 858 | * Grab and keep cached pages associated with a file in the svc_rqst |
| 859 | * so that they can be passed to the network sendmsg/sendpage routines |
| 860 | * directly. They will be released after the sending has completed. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 861 | */ |
| 862 | static int |
Jens Axboe | cf8208d | 2007-06-12 21:22:14 +0200 | [diff] [blame] | 863 | nfsd_splice_actor(struct pipe_inode_info *pipe, struct pipe_buffer *buf, |
| 864 | struct splice_desc *sd) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 865 | { |
Jens Axboe | cf8208d | 2007-06-12 21:22:14 +0200 | [diff] [blame] | 866 | struct svc_rqst *rqstp = sd->u.data; |
J. Bruce Fields | afc5940 | 2012-12-10 18:01:37 -0500 | [diff] [blame] | 867 | struct page **pp = rqstp->rq_next_page; |
Jens Axboe | cf8208d | 2007-06-12 21:22:14 +0200 | [diff] [blame] | 868 | struct page *page = buf->page; |
| 869 | size_t size; |
Jens Axboe | cf8208d | 2007-06-12 21:22:14 +0200 | [diff] [blame] | 870 | |
| 871 | size = sd->len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 872 | |
| 873 | if (rqstp->rq_res.page_len == 0) { |
| 874 | get_page(page); |
J. Bruce Fields | afc5940 | 2012-12-10 18:01:37 -0500 | [diff] [blame] | 875 | put_page(*rqstp->rq_next_page); |
| 876 | *(rqstp->rq_next_page++) = page; |
Jens Axboe | cf8208d | 2007-06-12 21:22:14 +0200 | [diff] [blame] | 877 | rqstp->rq_res.page_base = buf->offset; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 878 | rqstp->rq_res.page_len = size; |
NeilBrown | 4452435 | 2006-10-04 02:15:46 -0700 | [diff] [blame] | 879 | } else if (page != pp[-1]) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 880 | get_page(page); |
J. Bruce Fields | afc5940 | 2012-12-10 18:01:37 -0500 | [diff] [blame] | 881 | if (*rqstp->rq_next_page) |
| 882 | put_page(*rqstp->rq_next_page); |
| 883 | *(rqstp->rq_next_page++) = page; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 884 | rqstp->rq_res.page_len += size; |
NeilBrown | 4452435 | 2006-10-04 02:15:46 -0700 | [diff] [blame] | 885 | } else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 886 | rqstp->rq_res.page_len += size; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 887 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 888 | return size; |
| 889 | } |
| 890 | |
Jens Axboe | cf8208d | 2007-06-12 21:22:14 +0200 | [diff] [blame] | 891 | static int nfsd_direct_splice_actor(struct pipe_inode_info *pipe, |
| 892 | struct splice_desc *sd) |
| 893 | { |
| 894 | return __splice_from_pipe(pipe, sd, nfsd_splice_actor); |
| 895 | } |
| 896 | |
Jeff Layton | e2afc81 | 2014-06-17 07:44:13 -0400 | [diff] [blame] | 897 | static __be32 |
| 898 | nfsd_finish_read(struct file *file, unsigned long *count, int host_err) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 899 | { |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 900 | if (host_err >= 0) { |
| 901 | nfsdstats.io_read += host_err; |
| 902 | *count = host_err; |
Eric Paris | 2a12a9d | 2009-12-17 21:24:21 -0500 | [diff] [blame] | 903 | fsnotify_access(file); |
J. Bruce Fields | dc97618 | 2014-03-18 17:01:51 -0400 | [diff] [blame] | 904 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 905 | } else |
J. Bruce Fields | dc97618 | 2014-03-18 17:01:51 -0400 | [diff] [blame] | 906 | return nfserrno(host_err); |
| 907 | } |
| 908 | |
Jeff Layton | e2afc81 | 2014-06-17 07:44:13 -0400 | [diff] [blame] | 909 | __be32 nfsd_splice_read(struct svc_rqst *rqstp, |
J. Bruce Fields | dc97618 | 2014-03-18 17:01:51 -0400 | [diff] [blame] | 910 | struct file *file, loff_t offset, unsigned long *count) |
| 911 | { |
| 912 | struct splice_desc sd = { |
| 913 | .len = 0, |
| 914 | .total_len = *count, |
| 915 | .pos = offset, |
| 916 | .u.data = rqstp, |
| 917 | }; |
| 918 | int host_err; |
| 919 | |
| 920 | rqstp->rq_next_page = rqstp->rq_respages + 1; |
| 921 | host_err = splice_direct_to_actor(file, &sd, nfsd_direct_splice_actor); |
| 922 | return nfsd_finish_read(file, count, host_err); |
| 923 | } |
| 924 | |
Jeff Layton | e2afc81 | 2014-06-17 07:44:13 -0400 | [diff] [blame] | 925 | __be32 nfsd_readv(struct file *file, loff_t offset, struct kvec *vec, int vlen, |
J. Bruce Fields | dc97618 | 2014-03-18 17:01:51 -0400 | [diff] [blame] | 926 | unsigned long *count) |
| 927 | { |
| 928 | mm_segment_t oldfs; |
| 929 | int host_err; |
| 930 | |
| 931 | oldfs = get_fs(); |
| 932 | set_fs(KERNEL_DS); |
Christoph Hellwig | 793b80e | 2016-03-03 16:03:58 +0100 | [diff] [blame] | 933 | host_err = vfs_readv(file, (struct iovec __user *)vec, vlen, &offset, 0); |
J. Bruce Fields | dc97618 | 2014-03-18 17:01:51 -0400 | [diff] [blame] | 934 | set_fs(oldfs); |
| 935 | return nfsd_finish_read(file, count, host_err); |
| 936 | } |
| 937 | |
| 938 | static __be32 |
| 939 | nfsd_vfs_read(struct svc_rqst *rqstp, struct file *file, |
| 940 | loff_t offset, struct kvec *vec, int vlen, unsigned long *count) |
| 941 | { |
Jeff Layton | 779fb0f | 2014-11-19 07:51:18 -0500 | [diff] [blame] | 942 | if (file->f_op->splice_read && test_bit(RQ_SPLICE_OK, &rqstp->rq_flags)) |
J. Bruce Fields | dc97618 | 2014-03-18 17:01:51 -0400 | [diff] [blame] | 943 | return nfsd_splice_read(rqstp, file, offset, count); |
| 944 | else |
| 945 | return nfsd_readv(file, offset, vec, vlen, count); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 946 | } |
| 947 | |
J. Bruce Fields | d911df7 | 2009-06-15 16:03:53 -0700 | [diff] [blame] | 948 | /* |
| 949 | * Gathered writes: If another process is currently writing to the file, |
| 950 | * there's a high chance this is another nfsd (triggered by a bulk write |
| 951 | * from a client's biod). Rather than syncing the file with each write |
| 952 | * request, we sleep for 10 msec. |
| 953 | * |
| 954 | * I don't know if this roughly approximates C. Juszak's idea of |
| 955 | * gathered writes, but it's a nice and simple solution (IMHO), and it |
| 956 | * seems to work:-) |
| 957 | * |
| 958 | * Note: we do this only in the NFSv2 case, since v3 and higher have a |
| 959 | * better tool (separate unstable writes and commits) for solving this |
| 960 | * problem. |
| 961 | */ |
| 962 | static int wait_for_concurrent_writes(struct file *file) |
| 963 | { |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 964 | struct inode *inode = file_inode(file); |
J. Bruce Fields | d911df7 | 2009-06-15 16:03:53 -0700 | [diff] [blame] | 965 | static ino_t last_ino; |
| 966 | static dev_t last_dev; |
| 967 | int err = 0; |
| 968 | |
| 969 | if (atomic_read(&inode->i_writecount) > 1 |
| 970 | || (last_ino == inode->i_ino && last_dev == inode->i_sb->s_dev)) { |
| 971 | dprintk("nfsd: write defer %d\n", task_pid_nr(current)); |
| 972 | msleep(10); |
| 973 | dprintk("nfsd: write resume %d\n", task_pid_nr(current)); |
| 974 | } |
| 975 | |
| 976 | if (inode->i_state & I_DIRTY) { |
| 977 | dprintk("nfsd: write sync %d\n", task_pid_nr(current)); |
Christoph Hellwig | 8018ab0 | 2010-03-22 17:32:25 +0100 | [diff] [blame] | 978 | err = vfs_fsync(file, 0); |
J. Bruce Fields | d911df7 | 2009-06-15 16:03:53 -0700 | [diff] [blame] | 979 | } |
| 980 | last_ino = inode->i_ino; |
| 981 | last_dev = inode->i_sb->s_dev; |
| 982 | return err; |
| 983 | } |
| 984 | |
Christoph Hellwig | af90f70 | 2015-06-18 16:45:00 +0200 | [diff] [blame] | 985 | __be32 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 986 | nfsd_vfs_write(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file, |
| 987 | loff_t offset, struct kvec *vec, int vlen, |
David Shaw | 31dec25 | 2009-03-05 20:16:14 -0500 | [diff] [blame] | 988 | unsigned long *cnt, int *stablep) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 989 | { |
| 990 | struct svc_export *exp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 991 | struct inode *inode; |
| 992 | mm_segment_t oldfs; |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 993 | __be32 err = 0; |
| 994 | int host_err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 995 | int stable = *stablep; |
Trond Myklebust | 48e03bc | 2009-06-05 12:35:15 -0400 | [diff] [blame] | 996 | int use_wgather; |
Kent Overstreet | e49dbbf | 2013-03-22 11:18:24 -0700 | [diff] [blame] | 997 | loff_t pos = offset; |
NeilBrown | 8658452 | 2014-05-12 11:22:47 +1000 | [diff] [blame] | 998 | unsigned int pflags = current->flags; |
Christoph Hellwig | 24368aa | 2016-04-07 08:52:04 -0700 | [diff] [blame] | 999 | int flags = 0; |
NeilBrown | 8658452 | 2014-05-12 11:22:47 +1000 | [diff] [blame] | 1000 | |
Jeff Layton | 7501cc2 | 2014-11-19 07:51:15 -0500 | [diff] [blame] | 1001 | if (test_bit(RQ_LOCAL, &rqstp->rq_flags)) |
NeilBrown | 8658452 | 2014-05-12 11:22:47 +1000 | [diff] [blame] | 1002 | /* |
| 1003 | * We want less throttling in balance_dirty_pages() |
| 1004 | * and shrink_inactive_list() so that nfs to |
| 1005 | * localhost doesn't cause nfsd to lock up due to all |
| 1006 | * the client's dirty pages or its congested queue. |
| 1007 | */ |
| 1008 | current->flags |= PF_LESS_THROTTLE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1009 | |
Al Viro | 6f4e0d5 | 2014-10-31 02:42:53 -0400 | [diff] [blame] | 1010 | inode = file_inode(file); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1011 | exp = fhp->fh_export; |
| 1012 | |
Trond Myklebust | 48e03bc | 2009-06-05 12:35:15 -0400 | [diff] [blame] | 1013 | use_wgather = (rqstp->rq_vers == 2) && EX_WGATHER(exp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1014 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1015 | if (!EX_ISSYNC(exp)) |
| 1016 | stable = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1017 | |
Christoph Hellwig | 24368aa | 2016-04-07 08:52:04 -0700 | [diff] [blame] | 1018 | if (stable && !use_wgather) |
| 1019 | flags |= RWF_SYNC; |
| 1020 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1021 | /* Write the data. */ |
| 1022 | oldfs = get_fs(); set_fs(KERNEL_DS); |
Christoph Hellwig | 24368aa | 2016-04-07 08:52:04 -0700 | [diff] [blame] | 1023 | host_err = vfs_writev(file, (struct iovec __user *)vec, vlen, &pos, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1024 | set_fs(oldfs); |
J. Bruce Fields | e4636d5 | 2009-06-15 19:07:13 -0700 | [diff] [blame] | 1025 | if (host_err < 0) |
| 1026 | goto out_nfserr; |
| 1027 | *cnt = host_err; |
| 1028 | nfsdstats.io_write += host_err; |
Eric Paris | 2a12a9d | 2009-12-17 21:24:21 -0500 | [diff] [blame] | 1029 | fsnotify_modify(file); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1030 | |
Christoph Hellwig | 24368aa | 2016-04-07 08:52:04 -0700 | [diff] [blame] | 1031 | if (stable && use_wgather) |
| 1032 | host_err = wait_for_concurrent_writes(file); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1033 | |
J. Bruce Fields | e4636d5 | 2009-06-15 19:07:13 -0700 | [diff] [blame] | 1034 | out_nfserr: |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1035 | dprintk("nfsd: write complete host_err=%d\n", host_err); |
Wei Yongjun | a0d24b2 | 2009-05-19 12:03:15 +0800 | [diff] [blame] | 1036 | if (host_err >= 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1037 | err = 0; |
Wei Yongjun | a0d24b2 | 2009-05-19 12:03:15 +0800 | [diff] [blame] | 1038 | else |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1039 | err = nfserrno(host_err); |
Jeff Layton | 7501cc2 | 2014-11-19 07:51:15 -0500 | [diff] [blame] | 1040 | if (test_bit(RQ_LOCAL, &rqstp->rq_flags)) |
NeilBrown | 8658452 | 2014-05-12 11:22:47 +1000 | [diff] [blame] | 1041 | tsk_restore_flags(current, pflags, PF_LESS_THROTTLE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1042 | return err; |
| 1043 | } |
| 1044 | |
J. Bruce Fields | dc97618 | 2014-03-18 17:01:51 -0400 | [diff] [blame] | 1045 | /* |
| 1046 | * Read data from a file. count must contain the requested read count |
| 1047 | * on entry. On return, *count contains the number of bytes actually read. |
| 1048 | * N.B. After this call fhp needs an fh_put |
| 1049 | */ |
| 1050 | __be32 nfsd_read(struct svc_rqst *rqstp, struct svc_fh *fhp, |
| 1051 | loff_t offset, struct kvec *vec, int vlen, unsigned long *count) |
| 1052 | { |
| 1053 | struct file *file; |
| 1054 | struct raparms *ra; |
| 1055 | __be32 err; |
| 1056 | |
Jeff Layton | 6e8b50d | 2015-11-17 06:52:23 -0500 | [diff] [blame] | 1057 | trace_read_start(rqstp, fhp, offset, vlen); |
Christoph Hellwig | e749a46 | 2015-06-18 16:44:58 +0200 | [diff] [blame] | 1058 | err = nfsd_open(rqstp, fhp, S_IFREG, NFSD_MAY_READ, &file); |
J. Bruce Fields | dc97618 | 2014-03-18 17:01:51 -0400 | [diff] [blame] | 1059 | if (err) |
| 1060 | return err; |
| 1061 | |
Christoph Hellwig | e749a46 | 2015-06-18 16:44:58 +0200 | [diff] [blame] | 1062 | ra = nfsd_init_raparms(file); |
Jeff Layton | 6e8b50d | 2015-11-17 06:52:23 -0500 | [diff] [blame] | 1063 | |
| 1064 | trace_read_opened(rqstp, fhp, offset, vlen); |
J. Bruce Fields | dc97618 | 2014-03-18 17:01:51 -0400 | [diff] [blame] | 1065 | err = nfsd_vfs_read(rqstp, file, offset, vec, vlen, count); |
Jeff Layton | 6e8b50d | 2015-11-17 06:52:23 -0500 | [diff] [blame] | 1066 | trace_read_io_done(rqstp, fhp, offset, vlen); |
| 1067 | |
Christoph Hellwig | e749a46 | 2015-06-18 16:44:58 +0200 | [diff] [blame] | 1068 | if (ra) |
| 1069 | nfsd_put_raparams(file, ra); |
| 1070 | fput(file); |
J. Bruce Fields | dc97618 | 2014-03-18 17:01:51 -0400 | [diff] [blame] | 1071 | |
Jeff Layton | 6e8b50d | 2015-11-17 06:52:23 -0500 | [diff] [blame] | 1072 | trace_read_done(rqstp, fhp, offset, vlen); |
| 1073 | |
J. Bruce Fields | fa0a212 | 2010-07-27 16:48:54 -0400 | [diff] [blame] | 1074 | return err; |
| 1075 | } |
| 1076 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1077 | /* |
| 1078 | * Write data to a file. |
| 1079 | * The stable flag requests synchronous writes. |
| 1080 | * N.B. After this call fhp needs an fh_put |
| 1081 | */ |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1082 | __be32 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1083 | 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] | 1084 | loff_t offset, struct kvec *vec, int vlen, unsigned long *cnt, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1085 | int *stablep) |
| 1086 | { |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1087 | __be32 err = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1088 | |
Jeff Layton | 6e8b50d | 2015-11-17 06:52:23 -0500 | [diff] [blame] | 1089 | trace_write_start(rqstp, fhp, offset, vlen); |
| 1090 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1091 | if (file) { |
J. Bruce Fields | 0ec757d | 2007-07-17 04:04:48 -0700 | [diff] [blame] | 1092 | err = nfsd_permission(rqstp, fhp->fh_export, fhp->fh_dentry, |
Miklos Szeredi | 8837abc | 2008-06-16 13:20:29 +0200 | [diff] [blame] | 1093 | NFSD_MAY_WRITE|NFSD_MAY_OWNER_OVERRIDE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1094 | if (err) |
| 1095 | goto out; |
Jeff Layton | 6e8b50d | 2015-11-17 06:52:23 -0500 | [diff] [blame] | 1096 | trace_write_opened(rqstp, fhp, offset, vlen); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1097 | err = nfsd_vfs_write(rqstp, fhp, file, offset, vec, vlen, cnt, |
| 1098 | stablep); |
Jeff Layton | 6e8b50d | 2015-11-17 06:52:23 -0500 | [diff] [blame] | 1099 | trace_write_io_done(rqstp, fhp, offset, vlen); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1100 | } else { |
Miklos Szeredi | 8837abc | 2008-06-16 13:20:29 +0200 | [diff] [blame] | 1101 | err = nfsd_open(rqstp, fhp, S_IFREG, NFSD_MAY_WRITE, &file); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1102 | if (err) |
| 1103 | goto out; |
| 1104 | |
Jeff Layton | 6e8b50d | 2015-11-17 06:52:23 -0500 | [diff] [blame] | 1105 | trace_write_opened(rqstp, fhp, offset, vlen); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1106 | if (cnt) |
| 1107 | err = nfsd_vfs_write(rqstp, fhp, file, offset, vec, vlen, |
| 1108 | cnt, stablep); |
Jeff Layton | 6e8b50d | 2015-11-17 06:52:23 -0500 | [diff] [blame] | 1109 | trace_write_io_done(rqstp, fhp, offset, vlen); |
Christoph Hellwig | fd89145 | 2015-04-28 15:41:16 +0200 | [diff] [blame] | 1110 | fput(file); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1111 | } |
| 1112 | out: |
Jeff Layton | 6e8b50d | 2015-11-17 06:52:23 -0500 | [diff] [blame] | 1113 | trace_write_done(rqstp, fhp, offset, vlen); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1114 | return err; |
| 1115 | } |
| 1116 | |
| 1117 | #ifdef CONFIG_NFSD_V3 |
| 1118 | /* |
| 1119 | * Commit all pending writes to stable storage. |
Trond Myklebust | aa696a6 | 2010-01-29 16:44:25 -0500 | [diff] [blame] | 1120 | * |
| 1121 | * Note: we only guarantee that data that lies within the range specified |
| 1122 | * by the 'offset' and 'count' parameters will be synced. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1123 | * |
| 1124 | * Unfortunately we cannot lock the file to make sure we return full WCC |
| 1125 | * data to the client, as locking happens lower down in the filesystem. |
| 1126 | */ |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1127 | __be32 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1128 | nfsd_commit(struct svc_rqst *rqstp, struct svc_fh *fhp, |
| 1129 | loff_t offset, unsigned long count) |
| 1130 | { |
| 1131 | struct file *file; |
Trond Myklebust | aa696a6 | 2010-01-29 16:44:25 -0500 | [diff] [blame] | 1132 | loff_t end = LLONG_MAX; |
| 1133 | __be32 err = nfserr_inval; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1134 | |
Trond Myklebust | aa696a6 | 2010-01-29 16:44:25 -0500 | [diff] [blame] | 1135 | if (offset < 0) |
| 1136 | goto out; |
| 1137 | if (count != 0) { |
| 1138 | end = offset + (loff_t)count - 1; |
| 1139 | if (end < offset) |
| 1140 | goto out; |
| 1141 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1142 | |
Jeff Layton | 9188525 | 2010-03-19 08:06:28 -0400 | [diff] [blame] | 1143 | err = nfsd_open(rqstp, fhp, S_IFREG, |
| 1144 | NFSD_MAY_WRITE|NFSD_MAY_NOT_BREAK_LEASE, &file); |
Miklos Szeredi | 8837abc | 2008-06-16 13:20:29 +0200 | [diff] [blame] | 1145 | if (err) |
Trond Myklebust | aa696a6 | 2010-01-29 16:44:25 -0500 | [diff] [blame] | 1146 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1147 | if (EX_ISSYNC(fhp->fh_export)) { |
Christoph Hellwig | 8018ab0 | 2010-03-22 17:32:25 +0100 | [diff] [blame] | 1148 | int err2 = vfs_fsync_range(file, offset, end, 0); |
Trond Myklebust | aa696a6 | 2010-01-29 16:44:25 -0500 | [diff] [blame] | 1149 | |
| 1150 | if (err2 != -EINVAL) |
| 1151 | err = nfserrno(err2); |
| 1152 | else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1153 | err = nfserr_notsupp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1154 | } |
| 1155 | |
Christoph Hellwig | fd89145 | 2015-04-28 15:41:16 +0200 | [diff] [blame] | 1156 | fput(file); |
Trond Myklebust | aa696a6 | 2010-01-29 16:44:25 -0500 | [diff] [blame] | 1157 | out: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1158 | return err; |
| 1159 | } |
| 1160 | #endif /* CONFIG_NFSD_V3 */ |
| 1161 | |
Adrian Bunk | f2b0dee | 2008-02-13 23:30:26 +0200 | [diff] [blame] | 1162 | static __be32 |
J. Bruce Fields | 5c002b3 | 2007-11-30 16:55:23 -0500 | [diff] [blame] | 1163 | nfsd_create_setattr(struct svc_rqst *rqstp, struct svc_fh *resfhp, |
| 1164 | struct iattr *iap) |
| 1165 | { |
| 1166 | /* |
| 1167 | * Mode has already been set earlier in create: |
| 1168 | */ |
| 1169 | iap->ia_valid &= ~ATTR_MODE; |
| 1170 | /* |
| 1171 | * Setting uid/gid works only for root. Irix appears to |
| 1172 | * send along the gid on create when it tries to implement |
| 1173 | * setgid directories via NFS: |
| 1174 | */ |
Eric W. Biederman | 6fab877 | 2013-02-02 06:53:11 -0800 | [diff] [blame] | 1175 | if (!uid_eq(current_fsuid(), GLOBAL_ROOT_UID)) |
J. Bruce Fields | 5c002b3 | 2007-11-30 16:55:23 -0500 | [diff] [blame] | 1176 | iap->ia_valid &= ~(ATTR_UID|ATTR_GID); |
| 1177 | if (iap->ia_valid) |
| 1178 | return nfsd_setattr(rqstp, resfhp, iap, 0, (time_t)0); |
Trond Myklebust | 0f3a24b | 2014-07-01 18:27:53 -0400 | [diff] [blame] | 1179 | /* Callers expect file metadata to be committed here */ |
Jeff Layton | 722b620 | 2014-07-03 07:54:19 -0400 | [diff] [blame] | 1180 | return nfserrno(commit_metadata(resfhp)); |
J. Bruce Fields | 5c002b3 | 2007-11-30 16:55:23 -0500 | [diff] [blame] | 1181 | } |
| 1182 | |
wengang wang | 4ac35c2 | 2009-02-10 11:27:51 +0800 | [diff] [blame] | 1183 | /* HPUX client sometimes creates a file in mode 000, and sets size to 0. |
| 1184 | * setting size to 0 may fail for some specific file systems by the permission |
| 1185 | * checking which requires WRITE permission but the mode is 000. |
| 1186 | * we ignore the resizing(to 0) on the just new created file, since the size is |
| 1187 | * 0 after file created. |
| 1188 | * |
| 1189 | * call this only after vfs_create() is called. |
| 1190 | * */ |
| 1191 | static void |
| 1192 | nfsd_check_ignore_resizing(struct iattr *iap) |
| 1193 | { |
| 1194 | if ((iap->ia_valid & ATTR_SIZE) && (iap->ia_size == 0)) |
| 1195 | iap->ia_valid &= ~ATTR_SIZE; |
| 1196 | } |
| 1197 | |
J. Bruce Fields | b44061d | 2016-07-20 16:16:06 -0400 | [diff] [blame] | 1198 | /* The parent directory should already be locked: */ |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1199 | __be32 |
J. Bruce Fields | b44061d | 2016-07-20 16:16:06 -0400 | [diff] [blame] | 1200 | nfsd_create_locked(struct svc_rqst *rqstp, struct svc_fh *fhp, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1201 | char *fname, int flen, struct iattr *iap, |
| 1202 | int type, dev_t rdev, struct svc_fh *resfhp) |
| 1203 | { |
Dan Carpenter | 2b11885 | 2016-08-03 22:05:00 +0300 | [diff] [blame] | 1204 | struct dentry *dentry, *dchild; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1205 | struct inode *dirp; |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1206 | __be32 err; |
J. Bruce Fields | 5c002b3 | 2007-11-30 16:55:23 -0500 | [diff] [blame] | 1207 | __be32 err2; |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1208 | int host_err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1209 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1210 | dentry = fhp->fh_dentry; |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 1211 | dirp = d_inode(dentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1212 | |
J. Bruce Fields | b44061d | 2016-07-20 16:16:06 -0400 | [diff] [blame] | 1213 | dchild = dget(resfhp->fh_dentry); |
| 1214 | if (!fhp->fh_locked) { |
| 1215 | WARN_ONCE(1, "nfsd_create: parent %pd2 not locked!\n", |
Al Viro | a6a9f18 | 2013-09-16 10:57:01 -0400 | [diff] [blame] | 1216 | dentry); |
J. Bruce Fields | b44061d | 2016-07-20 16:16:06 -0400 | [diff] [blame] | 1217 | err = nfserr_io; |
| 1218 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1219 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1220 | |
Oleg Drokin | 7eed34f | 2016-07-14 23:20:22 -0400 | [diff] [blame] | 1221 | err = nfsd_permission(rqstp, fhp->fh_export, dentry, NFSD_MAY_CREATE); |
| 1222 | if (err) |
| 1223 | goto out; |
| 1224 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1225 | if (!(iap->ia_valid & ATTR_MODE)) |
| 1226 | iap->ia_mode = 0; |
| 1227 | iap->ia_mode = (iap->ia_mode & S_IALLUGO) | type; |
| 1228 | |
J. Bruce Fields | 088406b | 2006-11-08 17:44:59 -0800 | [diff] [blame] | 1229 | err = 0; |
Jan Kara | 4a55c10 | 2012-06-12 16:20:33 +0200 | [diff] [blame] | 1230 | host_err = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1231 | switch (type) { |
| 1232 | case S_IFREG: |
Al Viro | 312b63f | 2012-06-10 18:09:36 -0400 | [diff] [blame] | 1233 | host_err = vfs_create(dirp, dchild, iap->ia_mode, true); |
wengang wang | 4ac35c2 | 2009-02-10 11:27:51 +0800 | [diff] [blame] | 1234 | if (!host_err) |
| 1235 | nfsd_check_ignore_resizing(iap); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1236 | break; |
| 1237 | case S_IFDIR: |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1238 | host_err = vfs_mkdir(dirp, dchild, iap->ia_mode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1239 | break; |
| 1240 | case S_IFCHR: |
| 1241 | case S_IFBLK: |
| 1242 | case S_IFIFO: |
| 1243 | case S_IFSOCK: |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1244 | host_err = vfs_mknod(dirp, dchild, iap->ia_mode, rdev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1245 | break; |
J. Bruce Fields | 71423274 | 2016-07-22 12:03:46 -0400 | [diff] [blame] | 1246 | default: |
| 1247 | printk(KERN_WARNING "nfsd: bad file type %o in nfsd_create\n", |
| 1248 | type); |
| 1249 | host_err = -EINVAL; |
Dave Hansen | 463c319 | 2008-02-15 14:37:57 -0800 | [diff] [blame] | 1250 | } |
Jan Kara | 4a55c10 | 2012-06-12 16:20:33 +0200 | [diff] [blame] | 1251 | if (host_err < 0) |
Dave Hansen | 463c319 | 2008-02-15 14:37:57 -0800 | [diff] [blame] | 1252 | goto out_nfserr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1253 | |
Ben Myers | f501912 | 2010-02-17 14:05:11 -0600 | [diff] [blame] | 1254 | err = nfsd_create_setattr(rqstp, resfhp, iap); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1255 | |
Ben Myers | f501912 | 2010-02-17 14:05:11 -0600 | [diff] [blame] | 1256 | /* |
Trond Myklebust | 0f3a24b | 2014-07-01 18:27:53 -0400 | [diff] [blame] | 1257 | * nfsd_create_setattr already committed the child. Transactional |
| 1258 | * filesystems had a chance to commit changes for both parent and |
J. Bruce Fields | b44061d | 2016-07-20 16:16:06 -0400 | [diff] [blame] | 1259 | * child simultaneously making the following commit_metadata a |
Trond Myklebust | 0f3a24b | 2014-07-01 18:27:53 -0400 | [diff] [blame] | 1260 | * noop. |
Ben Myers | f501912 | 2010-02-17 14:05:11 -0600 | [diff] [blame] | 1261 | */ |
| 1262 | err2 = nfserrno(commit_metadata(fhp)); |
J. Bruce Fields | 5c002b3 | 2007-11-30 16:55:23 -0500 | [diff] [blame] | 1263 | if (err2) |
| 1264 | err = err2; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1265 | /* |
| 1266 | * Update the file handle to get the new inode info. |
| 1267 | */ |
| 1268 | if (!err) |
| 1269 | err = fh_update(resfhp); |
| 1270 | out: |
Dan Carpenter | 2b11885 | 2016-08-03 22:05:00 +0300 | [diff] [blame] | 1271 | dput(dchild); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1272 | return err; |
| 1273 | |
| 1274 | out_nfserr: |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1275 | err = nfserrno(host_err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1276 | goto out; |
| 1277 | } |
| 1278 | |
J. Bruce Fields | b44061d | 2016-07-20 16:16:06 -0400 | [diff] [blame] | 1279 | /* |
| 1280 | * Create a filesystem object (regular, directory, special). |
| 1281 | * Note that the parent directory is left locked. |
| 1282 | * |
| 1283 | * N.B. Every call to nfsd_create needs an fh_put for _both_ fhp and resfhp |
| 1284 | */ |
| 1285 | __be32 |
| 1286 | nfsd_create(struct svc_rqst *rqstp, struct svc_fh *fhp, |
| 1287 | char *fname, int flen, struct iattr *iap, |
| 1288 | int type, dev_t rdev, struct svc_fh *resfhp) |
| 1289 | { |
| 1290 | struct dentry *dentry, *dchild = NULL; |
| 1291 | struct inode *dirp; |
| 1292 | __be32 err; |
| 1293 | int host_err; |
| 1294 | |
| 1295 | if (isdotent(fname, flen)) |
| 1296 | return nfserr_exist; |
| 1297 | |
J. Bruce Fields | fa08139 | 2016-07-21 16:00:12 -0400 | [diff] [blame] | 1298 | err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_NOP); |
J. Bruce Fields | b44061d | 2016-07-20 16:16:06 -0400 | [diff] [blame] | 1299 | if (err) |
| 1300 | return err; |
| 1301 | |
| 1302 | dentry = fhp->fh_dentry; |
| 1303 | dirp = d_inode(dentry); |
| 1304 | |
| 1305 | host_err = fh_want_write(fhp); |
| 1306 | if (host_err) |
| 1307 | return nfserrno(host_err); |
| 1308 | |
| 1309 | fh_lock_nested(fhp, I_MUTEX_PARENT); |
| 1310 | dchild = lookup_one_len(fname, dentry, flen); |
| 1311 | host_err = PTR_ERR(dchild); |
| 1312 | if (IS_ERR(dchild)) |
| 1313 | return nfserrno(host_err); |
| 1314 | err = fh_compose(resfhp, fhp->fh_export, dchild, fhp); |
Josef Bacik | 502aa0a | 2016-08-10 14:46:27 -0400 | [diff] [blame] | 1315 | /* |
| 1316 | * We unconditionally drop our ref to dchild as fh_compose will have |
| 1317 | * already grabbed its own ref for it. |
| 1318 | */ |
| 1319 | dput(dchild); |
| 1320 | if (err) |
J. Bruce Fields | b44061d | 2016-07-20 16:16:06 -0400 | [diff] [blame] | 1321 | return err; |
J. Bruce Fields | b44061d | 2016-07-20 16:16:06 -0400 | [diff] [blame] | 1322 | return nfsd_create_locked(rqstp, fhp, fname, flen, iap, type, |
| 1323 | rdev, resfhp); |
| 1324 | } |
| 1325 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1326 | #ifdef CONFIG_NFSD_V3 |
Mi Jinlong | ac6721a | 2011-04-20 17:06:25 +0800 | [diff] [blame] | 1327 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1328 | /* |
Mi Jinlong | ac6721a | 2011-04-20 17:06:25 +0800 | [diff] [blame] | 1329 | * NFSv3 and NFSv4 version of nfsd_create |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1330 | */ |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1331 | __be32 |
Mi Jinlong | ac6721a | 2011-04-20 17:06:25 +0800 | [diff] [blame] | 1332 | do_nfsd_create(struct svc_rqst *rqstp, struct svc_fh *fhp, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1333 | char *fname, int flen, struct iattr *iap, |
| 1334 | struct svc_fh *resfhp, int createmode, u32 *verifier, |
J. Bruce Fields | 856121b | 2011-10-13 11:37:11 -0400 | [diff] [blame] | 1335 | bool *truncp, bool *created) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1336 | { |
| 1337 | struct dentry *dentry, *dchild = NULL; |
| 1338 | struct inode *dirp; |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1339 | __be32 err; |
| 1340 | int host_err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1341 | __u32 v_mtime=0, v_atime=0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1342 | |
| 1343 | err = nfserr_perm; |
| 1344 | if (!flen) |
| 1345 | goto out; |
| 1346 | err = nfserr_exist; |
| 1347 | if (isdotent(fname, flen)) |
| 1348 | goto out; |
| 1349 | if (!(iap->ia_valid & ATTR_MODE)) |
| 1350 | iap->ia_mode = 0; |
Sachin Prabhu | 1574dff | 2011-04-20 13:09:35 +0100 | [diff] [blame] | 1351 | err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_EXEC); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1352 | if (err) |
| 1353 | goto out; |
| 1354 | |
| 1355 | dentry = fhp->fh_dentry; |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 1356 | dirp = d_inode(dentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1357 | |
Jan Kara | 4a55c10 | 2012-06-12 16:20:33 +0200 | [diff] [blame] | 1358 | host_err = fh_want_write(fhp); |
| 1359 | if (host_err) |
| 1360 | goto out_nfserr; |
| 1361 | |
Peter Zijlstra | 12fd352 | 2006-10-02 02:18:03 -0700 | [diff] [blame] | 1362 | fh_lock_nested(fhp, I_MUTEX_PARENT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1363 | |
| 1364 | /* |
| 1365 | * Compose the response file handle. |
| 1366 | */ |
| 1367 | dchild = lookup_one_len(fname, dentry, flen); |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1368 | host_err = PTR_ERR(dchild); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1369 | if (IS_ERR(dchild)) |
| 1370 | goto out_nfserr; |
| 1371 | |
Sachin Prabhu | 1574dff | 2011-04-20 13:09:35 +0100 | [diff] [blame] | 1372 | /* If file doesn't exist, check for permissions to create one */ |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 1373 | if (d_really_is_negative(dchild)) { |
Sachin Prabhu | 1574dff | 2011-04-20 13:09:35 +0100 | [diff] [blame] | 1374 | err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_CREATE); |
| 1375 | if (err) |
| 1376 | goto out; |
| 1377 | } |
| 1378 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1379 | err = fh_compose(resfhp, fhp->fh_export, dchild, fhp); |
| 1380 | if (err) |
| 1381 | goto out; |
| 1382 | |
Mi Jinlong | ac6721a | 2011-04-20 17:06:25 +0800 | [diff] [blame] | 1383 | if (nfsd_create_is_exclusive(createmode)) { |
Peter Staubach | c397852 | 2007-01-26 00:57:00 -0800 | [diff] [blame] | 1384 | /* solaris7 gets confused (bugid 4218508) if these have |
Jeff Layton | 749997e | 2007-07-31 00:37:51 -0700 | [diff] [blame] | 1385 | * the high bit set, so just clear the high bits. If this is |
| 1386 | * ever changed to use different attrs for storing the |
| 1387 | * verifier, then do_open_lookup() will also need to be fixed |
| 1388 | * accordingly. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1389 | */ |
| 1390 | v_mtime = verifier[0]&0x7fffffff; |
| 1391 | v_atime = verifier[1]&0x7fffffff; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1392 | } |
| 1393 | |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 1394 | if (d_really_is_positive(dchild)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1395 | err = 0; |
| 1396 | |
| 1397 | switch (createmode) { |
| 1398 | case NFS3_CREATE_UNCHECKED: |
David Howells | e36cb0b | 2015-01-29 12:02:35 +0000 | [diff] [blame] | 1399 | if (! d_is_reg(dchild)) |
J. Bruce Fields | 9dc4e6c | 2012-04-09 18:06:49 -0400 | [diff] [blame] | 1400 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1401 | else if (truncp) { |
| 1402 | /* in nfsv4, we need to treat this case a little |
| 1403 | * differently. we don't want to truncate the |
| 1404 | * file now; this would be wrong if the OPEN |
| 1405 | * fails for some other reason. furthermore, |
| 1406 | * if the size is nonzero, we should ignore it |
| 1407 | * according to spec! |
| 1408 | */ |
| 1409 | *truncp = (iap->ia_valid & ATTR_SIZE) && !iap->ia_size; |
| 1410 | } |
| 1411 | else { |
| 1412 | iap->ia_valid &= ATTR_SIZE; |
| 1413 | goto set_attr; |
| 1414 | } |
| 1415 | break; |
| 1416 | case NFS3_CREATE_EXCLUSIVE: |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 1417 | if ( d_inode(dchild)->i_mtime.tv_sec == v_mtime |
| 1418 | && d_inode(dchild)->i_atime.tv_sec == v_atime |
| 1419 | && d_inode(dchild)->i_size == 0 ) { |
Neil Brown | 7007c90 | 2012-12-07 15:40:55 -0500 | [diff] [blame] | 1420 | if (created) |
| 1421 | *created = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1422 | break; |
Neil Brown | 7007c90 | 2012-12-07 15:40:55 -0500 | [diff] [blame] | 1423 | } |
Mi Jinlong | ac6721a | 2011-04-20 17:06:25 +0800 | [diff] [blame] | 1424 | case NFS4_CREATE_EXCLUSIVE4_1: |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 1425 | if ( d_inode(dchild)->i_mtime.tv_sec == v_mtime |
| 1426 | && d_inode(dchild)->i_atime.tv_sec == v_atime |
| 1427 | && d_inode(dchild)->i_size == 0 ) { |
Neil Brown | 7007c90 | 2012-12-07 15:40:55 -0500 | [diff] [blame] | 1428 | if (created) |
| 1429 | *created = 1; |
Mi Jinlong | ac6721a | 2011-04-20 17:06:25 +0800 | [diff] [blame] | 1430 | goto set_attr; |
Neil Brown | 7007c90 | 2012-12-07 15:40:55 -0500 | [diff] [blame] | 1431 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1432 | /* fallthru */ |
| 1433 | case NFS3_CREATE_GUARDED: |
| 1434 | err = nfserr_exist; |
| 1435 | } |
Al Viro | bad0dcf | 2011-11-23 12:03:18 -0500 | [diff] [blame] | 1436 | fh_drop_write(fhp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1437 | goto out; |
| 1438 | } |
| 1439 | |
Al Viro | 312b63f | 2012-06-10 18:09:36 -0400 | [diff] [blame] | 1440 | host_err = vfs_create(dirp, dchild, iap->ia_mode, true); |
Dave Hansen | 463c319 | 2008-02-15 14:37:57 -0800 | [diff] [blame] | 1441 | if (host_err < 0) { |
Al Viro | bad0dcf | 2011-11-23 12:03:18 -0500 | [diff] [blame] | 1442 | fh_drop_write(fhp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1443 | goto out_nfserr; |
Dave Hansen | 463c319 | 2008-02-15 14:37:57 -0800 | [diff] [blame] | 1444 | } |
J. Bruce Fields | 81ac95c | 2006-11-08 17:44:40 -0800 | [diff] [blame] | 1445 | if (created) |
| 1446 | *created = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1447 | |
wengang wang | 4ac35c2 | 2009-02-10 11:27:51 +0800 | [diff] [blame] | 1448 | nfsd_check_ignore_resizing(iap); |
| 1449 | |
Mi Jinlong | ac6721a | 2011-04-20 17:06:25 +0800 | [diff] [blame] | 1450 | if (nfsd_create_is_exclusive(createmode)) { |
Peter Staubach | c397852 | 2007-01-26 00:57:00 -0800 | [diff] [blame] | 1451 | /* Cram the verifier into atime/mtime */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1452 | iap->ia_valid = ATTR_MTIME|ATTR_ATIME |
Peter Staubach | c397852 | 2007-01-26 00:57:00 -0800 | [diff] [blame] | 1453 | | ATTR_MTIME_SET|ATTR_ATIME_SET; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1454 | /* XXX someone who knows this better please fix it for nsec */ |
| 1455 | iap->ia_mtime.tv_sec = v_mtime; |
| 1456 | iap->ia_atime.tv_sec = v_atime; |
| 1457 | iap->ia_mtime.tv_nsec = 0; |
| 1458 | iap->ia_atime.tv_nsec = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1459 | } |
| 1460 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1461 | set_attr: |
Ben Myers | f501912 | 2010-02-17 14:05:11 -0600 | [diff] [blame] | 1462 | err = nfsd_create_setattr(rqstp, resfhp, iap); |
| 1463 | |
| 1464 | /* |
Trond Myklebust | 0f3a24b | 2014-07-01 18:27:53 -0400 | [diff] [blame] | 1465 | * nfsd_create_setattr already committed the child |
| 1466 | * (and possibly also the parent). |
Ben Myers | f501912 | 2010-02-17 14:05:11 -0600 | [diff] [blame] | 1467 | */ |
| 1468 | if (!err) |
| 1469 | err = nfserrno(commit_metadata(fhp)); |
YAMAMOTO Takashi | f193fba | 2006-01-18 17:43:13 -0800 | [diff] [blame] | 1470 | |
| 1471 | /* |
| 1472 | * Update the filehandle to get the new inode info. |
| 1473 | */ |
| 1474 | if (!err) |
| 1475 | err = fh_update(resfhp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1476 | |
| 1477 | out: |
| 1478 | fh_unlock(fhp); |
| 1479 | if (dchild && !IS_ERR(dchild)) |
| 1480 | dput(dchild); |
Jan Kara | 4a55c10 | 2012-06-12 16:20:33 +0200 | [diff] [blame] | 1481 | fh_drop_write(fhp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1482 | return err; |
| 1483 | |
| 1484 | out_nfserr: |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1485 | err = nfserrno(host_err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1486 | goto out; |
| 1487 | } |
| 1488 | #endif /* CONFIG_NFSD_V3 */ |
| 1489 | |
| 1490 | /* |
| 1491 | * Read a symlink. On entry, *lenp must contain the maximum path length that |
| 1492 | * fits into the buffer. On return, it contains the true length. |
| 1493 | * N.B. After this call fhp needs an fh_put |
| 1494 | */ |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1495 | __be32 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1496 | nfsd_readlink(struct svc_rqst *rqstp, struct svc_fh *fhp, char *buf, int *lenp) |
| 1497 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1498 | struct inode *inode; |
| 1499 | mm_segment_t oldfs; |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1500 | __be32 err; |
| 1501 | int host_err; |
Al Viro | 68ac123 | 2012-03-15 08:21:57 -0400 | [diff] [blame] | 1502 | struct path path; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1503 | |
Miklos Szeredi | 8837abc | 2008-06-16 13:20:29 +0200 | [diff] [blame] | 1504 | err = fh_verify(rqstp, fhp, S_IFLNK, NFSD_MAY_NOP); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1505 | if (err) |
| 1506 | goto out; |
| 1507 | |
Al Viro | 68ac123 | 2012-03-15 08:21:57 -0400 | [diff] [blame] | 1508 | path.mnt = fhp->fh_export->ex_path.mnt; |
| 1509 | path.dentry = fhp->fh_dentry; |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 1510 | inode = d_inode(path.dentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1511 | |
| 1512 | err = nfserr_inval; |
Al Viro | acfa438 | 2008-12-04 10:06:33 -0500 | [diff] [blame] | 1513 | if (!inode->i_op->readlink) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1514 | goto out; |
| 1515 | |
Al Viro | 68ac123 | 2012-03-15 08:21:57 -0400 | [diff] [blame] | 1516 | touch_atime(&path); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1517 | /* N.B. Why does this call need a get_fs()?? |
| 1518 | * Remove the set_fs and watch the fireworks:-) --okir |
| 1519 | */ |
| 1520 | |
| 1521 | oldfs = get_fs(); set_fs(KERNEL_DS); |
J. Bruce Fields | fac7a17 | 2012-07-27 14:16:55 -0400 | [diff] [blame] | 1522 | host_err = inode->i_op->readlink(path.dentry, (char __user *)buf, *lenp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1523 | set_fs(oldfs); |
| 1524 | |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1525 | if (host_err < 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1526 | goto out_nfserr; |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1527 | *lenp = host_err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1528 | err = 0; |
| 1529 | out: |
| 1530 | return err; |
| 1531 | |
| 1532 | out_nfserr: |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1533 | err = nfserrno(host_err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1534 | goto out; |
| 1535 | } |
| 1536 | |
| 1537 | /* |
| 1538 | * Create a symlink and look up its inode |
| 1539 | * N.B. After this call _both_ fhp and resfhp need an fh_put |
| 1540 | */ |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1541 | __be32 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1542 | nfsd_symlink(struct svc_rqst *rqstp, struct svc_fh *fhp, |
| 1543 | char *fname, int flen, |
J. Bruce Fields | 52ee043 | 2014-06-20 11:52:21 -0400 | [diff] [blame] | 1544 | char *path, |
Kinglong Mee | 1e444f5 | 2014-07-01 17:48:02 +0800 | [diff] [blame] | 1545 | struct svc_fh *resfhp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1546 | { |
| 1547 | struct dentry *dentry, *dnew; |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1548 | __be32 err, cerr; |
| 1549 | int host_err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1550 | |
| 1551 | err = nfserr_noent; |
J. Bruce Fields | 52ee043 | 2014-06-20 11:52:21 -0400 | [diff] [blame] | 1552 | if (!flen || path[0] == '\0') |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1553 | goto out; |
| 1554 | err = nfserr_exist; |
| 1555 | if (isdotent(fname, flen)) |
| 1556 | goto out; |
| 1557 | |
Miklos Szeredi | 8837abc | 2008-06-16 13:20:29 +0200 | [diff] [blame] | 1558 | err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_CREATE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1559 | if (err) |
| 1560 | goto out; |
Jan Kara | 4a55c10 | 2012-06-12 16:20:33 +0200 | [diff] [blame] | 1561 | |
| 1562 | host_err = fh_want_write(fhp); |
| 1563 | if (host_err) |
| 1564 | goto out_nfserr; |
| 1565 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1566 | fh_lock(fhp); |
| 1567 | dentry = fhp->fh_dentry; |
| 1568 | dnew = lookup_one_len(fname, dentry, flen); |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1569 | host_err = PTR_ERR(dnew); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1570 | if (IS_ERR(dnew)) |
| 1571 | goto out_nfserr; |
| 1572 | |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 1573 | host_err = vfs_symlink(d_inode(dentry), dnew, path); |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1574 | err = nfserrno(host_err); |
Ben Myers | f501912 | 2010-02-17 14:05:11 -0600 | [diff] [blame] | 1575 | if (!err) |
| 1576 | err = nfserrno(commit_metadata(fhp)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1577 | fh_unlock(fhp); |
| 1578 | |
Al Viro | bad0dcf | 2011-11-23 12:03:18 -0500 | [diff] [blame] | 1579 | fh_drop_write(fhp); |
Dave Hansen | 75c3f29 | 2008-02-15 14:37:45 -0800 | [diff] [blame] | 1580 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1581 | cerr = fh_compose(resfhp, fhp->fh_export, dnew, fhp); |
| 1582 | dput(dnew); |
| 1583 | if (err==0) err = cerr; |
| 1584 | out: |
| 1585 | return err; |
| 1586 | |
| 1587 | out_nfserr: |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1588 | err = nfserrno(host_err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1589 | goto out; |
| 1590 | } |
| 1591 | |
| 1592 | /* |
| 1593 | * Create a hardlink |
| 1594 | * N.B. After this call _both_ ffhp and tfhp need an fh_put |
| 1595 | */ |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1596 | __be32 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1597 | nfsd_link(struct svc_rqst *rqstp, struct svc_fh *ffhp, |
| 1598 | char *name, int len, struct svc_fh *tfhp) |
| 1599 | { |
| 1600 | struct dentry *ddir, *dnew, *dold; |
J. Bruce Fields | 55b1335 | 2010-07-19 16:38:24 -0400 | [diff] [blame] | 1601 | struct inode *dirp; |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1602 | __be32 err; |
| 1603 | int host_err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1604 | |
Miklos Szeredi | 8837abc | 2008-06-16 13:20:29 +0200 | [diff] [blame] | 1605 | err = fh_verify(rqstp, ffhp, S_IFDIR, NFSD_MAY_CREATE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1606 | if (err) |
| 1607 | goto out; |
J. Bruce Fields | 7d818a7 | 2011-08-15 16:59:55 -0400 | [diff] [blame] | 1608 | err = fh_verify(rqstp, tfhp, 0, NFSD_MAY_NOP); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1609 | if (err) |
| 1610 | goto out; |
J. Bruce Fields | 7d818a7 | 2011-08-15 16:59:55 -0400 | [diff] [blame] | 1611 | err = nfserr_isdir; |
David Howells | e36cb0b | 2015-01-29 12:02:35 +0000 | [diff] [blame] | 1612 | if (d_is_dir(tfhp->fh_dentry)) |
J. Bruce Fields | 7d818a7 | 2011-08-15 16:59:55 -0400 | [diff] [blame] | 1613 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1614 | err = nfserr_perm; |
| 1615 | if (!len) |
| 1616 | goto out; |
| 1617 | err = nfserr_exist; |
| 1618 | if (isdotent(name, len)) |
| 1619 | goto out; |
| 1620 | |
Jan Kara | 4a55c10 | 2012-06-12 16:20:33 +0200 | [diff] [blame] | 1621 | host_err = fh_want_write(tfhp); |
| 1622 | if (host_err) { |
| 1623 | err = nfserrno(host_err); |
| 1624 | goto out; |
| 1625 | } |
| 1626 | |
Peter Zijlstra | 12fd352 | 2006-10-02 02:18:03 -0700 | [diff] [blame] | 1627 | fh_lock_nested(ffhp, I_MUTEX_PARENT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1628 | ddir = ffhp->fh_dentry; |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 1629 | dirp = d_inode(ddir); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1630 | |
| 1631 | dnew = lookup_one_len(name, ddir, len); |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1632 | host_err = PTR_ERR(dnew); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1633 | if (IS_ERR(dnew)) |
| 1634 | goto out_nfserr; |
| 1635 | |
| 1636 | dold = tfhp->fh_dentry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1637 | |
J. Bruce Fields | 4795bb3 | 2011-01-11 13:55:46 -0500 | [diff] [blame] | 1638 | err = nfserr_noent; |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 1639 | if (d_really_is_negative(dold)) |
Jan Kara | 4a55c10 | 2012-06-12 16:20:33 +0200 | [diff] [blame] | 1640 | goto out_dput; |
J. Bruce Fields | 146a859 | 2011-09-20 17:14:31 -0400 | [diff] [blame] | 1641 | host_err = vfs_link(dold, dirp, dnew, NULL); |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1642 | if (!host_err) { |
Ben Myers | f501912 | 2010-02-17 14:05:11 -0600 | [diff] [blame] | 1643 | err = nfserrno(commit_metadata(ffhp)); |
| 1644 | if (!err) |
| 1645 | err = nfserrno(commit_metadata(tfhp)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1646 | } else { |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1647 | if (host_err == -EXDEV && rqstp->rq_vers == 2) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1648 | err = nfserr_acces; |
| 1649 | else |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1650 | err = nfserrno(host_err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1651 | } |
Dave Hansen | 75c3f29 | 2008-02-15 14:37:45 -0800 | [diff] [blame] | 1652 | out_dput: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1653 | dput(dnew); |
David M. Richter | 270d56e | 2006-06-30 01:56:15 -0700 | [diff] [blame] | 1654 | out_unlock: |
| 1655 | fh_unlock(ffhp); |
Jan Kara | 4a55c10 | 2012-06-12 16:20:33 +0200 | [diff] [blame] | 1656 | fh_drop_write(tfhp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1657 | out: |
| 1658 | return err; |
| 1659 | |
| 1660 | out_nfserr: |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1661 | err = nfserrno(host_err); |
David M. Richter | 270d56e | 2006-06-30 01:56:15 -0700 | [diff] [blame] | 1662 | goto out_unlock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1663 | } |
| 1664 | |
| 1665 | /* |
| 1666 | * Rename a file |
| 1667 | * N.B. After this call _both_ ffhp and tfhp need an fh_put |
| 1668 | */ |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1669 | __be32 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1670 | nfsd_rename(struct svc_rqst *rqstp, struct svc_fh *ffhp, char *fname, int flen, |
| 1671 | struct svc_fh *tfhp, char *tname, int tlen) |
| 1672 | { |
| 1673 | struct dentry *fdentry, *tdentry, *odentry, *ndentry, *trap; |
| 1674 | struct inode *fdir, *tdir; |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1675 | __be32 err; |
| 1676 | int host_err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1677 | |
Miklos Szeredi | 8837abc | 2008-06-16 13:20:29 +0200 | [diff] [blame] | 1678 | err = fh_verify(rqstp, ffhp, S_IFDIR, NFSD_MAY_REMOVE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1679 | if (err) |
| 1680 | goto out; |
Miklos Szeredi | 8837abc | 2008-06-16 13:20:29 +0200 | [diff] [blame] | 1681 | err = fh_verify(rqstp, tfhp, S_IFDIR, NFSD_MAY_CREATE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1682 | if (err) |
| 1683 | goto out; |
| 1684 | |
| 1685 | fdentry = ffhp->fh_dentry; |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 1686 | fdir = d_inode(fdentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1687 | |
| 1688 | tdentry = tfhp->fh_dentry; |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 1689 | tdir = d_inode(tdentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1690 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1691 | err = nfserr_perm; |
| 1692 | if (!flen || isdotent(fname, flen) || !tlen || isdotent(tname, tlen)) |
| 1693 | goto out; |
| 1694 | |
Jan Kara | 4a55c10 | 2012-06-12 16:20:33 +0200 | [diff] [blame] | 1695 | host_err = fh_want_write(ffhp); |
| 1696 | if (host_err) { |
| 1697 | err = nfserrno(host_err); |
| 1698 | goto out; |
| 1699 | } |
| 1700 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1701 | /* cannot use fh_lock as we need deadlock protective ordering |
| 1702 | * so do it by hand */ |
| 1703 | trap = lock_rename(tdentry, fdentry); |
Jeff Layton | aaf91ec | 2015-09-17 08:28:39 -0400 | [diff] [blame] | 1704 | ffhp->fh_locked = tfhp->fh_locked = true; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1705 | fill_pre_wcc(ffhp); |
| 1706 | fill_pre_wcc(tfhp); |
| 1707 | |
| 1708 | odentry = lookup_one_len(fname, fdentry, flen); |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1709 | host_err = PTR_ERR(odentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1710 | if (IS_ERR(odentry)) |
| 1711 | goto out_nfserr; |
| 1712 | |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1713 | host_err = -ENOENT; |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 1714 | if (d_really_is_negative(odentry)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1715 | goto out_dput_old; |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1716 | host_err = -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1717 | if (odentry == trap) |
| 1718 | goto out_dput_old; |
| 1719 | |
| 1720 | ndentry = lookup_one_len(tname, tdentry, tlen); |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1721 | host_err = PTR_ERR(ndentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1722 | if (IS_ERR(ndentry)) |
| 1723 | goto out_dput_old; |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1724 | host_err = -ENOTEMPTY; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1725 | if (ndentry == trap) |
| 1726 | goto out_dput_new; |
| 1727 | |
Dave Hansen | 9079b1e | 2008-02-15 14:37:49 -0800 | [diff] [blame] | 1728 | host_err = -EXDEV; |
| 1729 | if (ffhp->fh_export->ex_path.mnt != tfhp->fh_export->ex_path.mnt) |
| 1730 | goto out_dput_new; |
J. Bruce Fields | aa387d6c | 2013-04-15 16:03:46 -0400 | [diff] [blame] | 1731 | if (ffhp->fh_export->ex_path.dentry != tfhp->fh_export->ex_path.dentry) |
| 1732 | goto out_dput_new; |
Dave Hansen | 9079b1e | 2008-02-15 14:37:49 -0800 | [diff] [blame] | 1733 | |
Miklos Szeredi | 520c8b1 | 2014-04-01 17:08:42 +0200 | [diff] [blame] | 1734 | host_err = vfs_rename(fdir, odentry, tdir, ndentry, NULL, 0); |
Ben Myers | f501912 | 2010-02-17 14:05:11 -0600 | [diff] [blame] | 1735 | if (!host_err) { |
| 1736 | host_err = commit_metadata(tfhp); |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1737 | if (!host_err) |
Ben Myers | f501912 | 2010-02-17 14:05:11 -0600 | [diff] [blame] | 1738 | host_err = commit_metadata(ffhp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1739 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1740 | out_dput_new: |
| 1741 | dput(ndentry); |
| 1742 | out_dput_old: |
| 1743 | dput(odentry); |
| 1744 | out_nfserr: |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1745 | err = nfserrno(host_err); |
J. Bruce Fields | fbb74a3 | 2014-03-28 16:43:17 -0400 | [diff] [blame] | 1746 | /* |
| 1747 | * We cannot rely on fh_unlock on the two filehandles, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1748 | * as that would do the wrong thing if the two directories |
J. Bruce Fields | fbb74a3 | 2014-03-28 16:43:17 -0400 | [diff] [blame] | 1749 | * were the same, so again we do it by hand. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1750 | */ |
| 1751 | fill_post_wcc(ffhp); |
| 1752 | fill_post_wcc(tfhp); |
| 1753 | unlock_rename(tdentry, fdentry); |
Jeff Layton | aaf91ec | 2015-09-17 08:28:39 -0400 | [diff] [blame] | 1754 | ffhp->fh_locked = tfhp->fh_locked = false; |
Jan Kara | 4a55c10 | 2012-06-12 16:20:33 +0200 | [diff] [blame] | 1755 | fh_drop_write(ffhp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1756 | |
| 1757 | out: |
| 1758 | return err; |
| 1759 | } |
| 1760 | |
| 1761 | /* |
| 1762 | * Unlink a file or directory |
| 1763 | * N.B. After this call fhp needs an fh_put |
| 1764 | */ |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1765 | __be32 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1766 | nfsd_unlink(struct svc_rqst *rqstp, struct svc_fh *fhp, int type, |
| 1767 | char *fname, int flen) |
| 1768 | { |
| 1769 | struct dentry *dentry, *rdentry; |
| 1770 | struct inode *dirp; |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1771 | __be32 err; |
| 1772 | int host_err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1773 | |
| 1774 | err = nfserr_acces; |
| 1775 | if (!flen || isdotent(fname, flen)) |
| 1776 | goto out; |
Miklos Szeredi | 8837abc | 2008-06-16 13:20:29 +0200 | [diff] [blame] | 1777 | err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_REMOVE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1778 | if (err) |
| 1779 | goto out; |
| 1780 | |
Jan Kara | 4a55c10 | 2012-06-12 16:20:33 +0200 | [diff] [blame] | 1781 | host_err = fh_want_write(fhp); |
| 1782 | if (host_err) |
| 1783 | goto out_nfserr; |
| 1784 | |
Peter Zijlstra | 12fd352 | 2006-10-02 02:18:03 -0700 | [diff] [blame] | 1785 | fh_lock_nested(fhp, I_MUTEX_PARENT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1786 | dentry = fhp->fh_dentry; |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 1787 | dirp = d_inode(dentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1788 | |
| 1789 | rdentry = lookup_one_len(fname, dentry, flen); |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1790 | host_err = PTR_ERR(rdentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1791 | if (IS_ERR(rdentry)) |
| 1792 | goto out_nfserr; |
| 1793 | |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 1794 | if (d_really_is_negative(rdentry)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1795 | dput(rdentry); |
| 1796 | err = nfserr_noent; |
| 1797 | goto out; |
| 1798 | } |
| 1799 | |
| 1800 | if (!type) |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 1801 | type = d_inode(rdentry)->i_mode & S_IFMT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1802 | |
J. Bruce Fields | 9ce137e | 2011-01-11 14:07:12 -0500 | [diff] [blame] | 1803 | if (type != S_IFDIR) |
J. Bruce Fields | b21996e | 2011-09-20 09:14:34 -0400 | [diff] [blame] | 1804 | host_err = vfs_unlink(dirp, rdentry, NULL); |
J. Bruce Fields | 9ce137e | 2011-01-11 14:07:12 -0500 | [diff] [blame] | 1805 | else |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1806 | host_err = vfs_rmdir(dirp, rdentry); |
J. Bruce Fields | 541ce98 | 2011-01-14 20:00:02 -0500 | [diff] [blame] | 1807 | if (!host_err) |
| 1808 | host_err = commit_metadata(fhp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1809 | dput(rdentry); |
| 1810 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1811 | out_nfserr: |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1812 | err = nfserrno(host_err); |
YAMAMOTO Takashi | f193fba | 2006-01-18 17:43:13 -0800 | [diff] [blame] | 1813 | out: |
| 1814 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1815 | } |
| 1816 | |
| 1817 | /* |
David Woodhouse | 14f7dd6 | 2008-07-31 20:29:12 +0100 | [diff] [blame] | 1818 | * We do this buffering because we must not call back into the file |
| 1819 | * system's ->lookup() method from the filldir callback. That may well |
| 1820 | * deadlock a number of file systems. |
| 1821 | * |
| 1822 | * This is based heavily on the implementation of same in XFS. |
| 1823 | */ |
| 1824 | struct buffered_dirent { |
| 1825 | u64 ino; |
| 1826 | loff_t offset; |
| 1827 | int namlen; |
| 1828 | unsigned int d_type; |
| 1829 | char name[]; |
| 1830 | }; |
| 1831 | |
| 1832 | struct readdir_data { |
Al Viro | 5c0ba4e | 2013-05-15 13:52:59 -0400 | [diff] [blame] | 1833 | struct dir_context ctx; |
David Woodhouse | 14f7dd6 | 2008-07-31 20:29:12 +0100 | [diff] [blame] | 1834 | char *dirent; |
| 1835 | size_t used; |
Al Viro | 53c9c5c | 2008-08-24 07:29:52 -0400 | [diff] [blame] | 1836 | int full; |
David Woodhouse | 14f7dd6 | 2008-07-31 20:29:12 +0100 | [diff] [blame] | 1837 | }; |
| 1838 | |
Miklos Szeredi | ac7576f | 2014-10-30 17:37:34 +0100 | [diff] [blame] | 1839 | static int nfsd_buffered_filldir(struct dir_context *ctx, const char *name, |
| 1840 | int namlen, loff_t offset, u64 ino, |
| 1841 | unsigned int d_type) |
David Woodhouse | 2628b76 | 2008-07-31 17:16:51 +0100 | [diff] [blame] | 1842 | { |
Miklos Szeredi | ac7576f | 2014-10-30 17:37:34 +0100 | [diff] [blame] | 1843 | struct readdir_data *buf = |
| 1844 | container_of(ctx, struct readdir_data, ctx); |
David Woodhouse | 14f7dd6 | 2008-07-31 20:29:12 +0100 | [diff] [blame] | 1845 | struct buffered_dirent *de = (void *)(buf->dirent + buf->used); |
| 1846 | unsigned int reclen; |
| 1847 | |
| 1848 | reclen = ALIGN(sizeof(struct buffered_dirent) + namlen, sizeof(u64)); |
Al Viro | 53c9c5c | 2008-08-24 07:29:52 -0400 | [diff] [blame] | 1849 | if (buf->used + reclen > PAGE_SIZE) { |
| 1850 | buf->full = 1; |
David Woodhouse | 14f7dd6 | 2008-07-31 20:29:12 +0100 | [diff] [blame] | 1851 | return -EINVAL; |
Al Viro | 53c9c5c | 2008-08-24 07:29:52 -0400 | [diff] [blame] | 1852 | } |
David Woodhouse | 14f7dd6 | 2008-07-31 20:29:12 +0100 | [diff] [blame] | 1853 | |
| 1854 | de->namlen = namlen; |
| 1855 | de->offset = offset; |
| 1856 | de->ino = ino; |
| 1857 | de->d_type = d_type; |
| 1858 | memcpy(de->name, name, namlen); |
| 1859 | buf->used += reclen; |
| 1860 | |
| 1861 | return 0; |
| 1862 | } |
| 1863 | |
Miklos Szeredi | ac7576f | 2014-10-30 17:37:34 +0100 | [diff] [blame] | 1864 | static __be32 nfsd_buffered_readdir(struct file *file, nfsd_filldir_t func, |
David Woodhouse | 2f9092e | 2009-04-20 23:18:37 +0100 | [diff] [blame] | 1865 | struct readdir_cd *cdp, loff_t *offsetp) |
David Woodhouse | 14f7dd6 | 2008-07-31 20:29:12 +0100 | [diff] [blame] | 1866 | { |
David Woodhouse | 14f7dd6 | 2008-07-31 20:29:12 +0100 | [diff] [blame] | 1867 | struct buffered_dirent *de; |
David Woodhouse | 2628b76 | 2008-07-31 17:16:51 +0100 | [diff] [blame] | 1868 | int host_err; |
David Woodhouse | 14f7dd6 | 2008-07-31 20:29:12 +0100 | [diff] [blame] | 1869 | int size; |
| 1870 | loff_t offset; |
Al Viro | ac6614b | 2013-05-22 22:22:04 -0400 | [diff] [blame] | 1871 | struct readdir_data buf = { |
| 1872 | .ctx.actor = nfsd_buffered_filldir, |
| 1873 | .dirent = (void *)__get_free_page(GFP_KERNEL) |
| 1874 | }; |
David Woodhouse | 2628b76 | 2008-07-31 17:16:51 +0100 | [diff] [blame] | 1875 | |
David Woodhouse | 14f7dd6 | 2008-07-31 20:29:12 +0100 | [diff] [blame] | 1876 | if (!buf.dirent) |
David Woodhouse | 2f9092e | 2009-04-20 23:18:37 +0100 | [diff] [blame] | 1877 | return nfserrno(-ENOMEM); |
David Woodhouse | 2628b76 | 2008-07-31 17:16:51 +0100 | [diff] [blame] | 1878 | |
David Woodhouse | 14f7dd6 | 2008-07-31 20:29:12 +0100 | [diff] [blame] | 1879 | offset = *offsetp; |
David Woodhouse | 14f7dd6 | 2008-07-31 20:29:12 +0100 | [diff] [blame] | 1880 | |
| 1881 | while (1) { |
| 1882 | unsigned int reclen; |
| 1883 | |
Doug Nazar | b726e92 | 2008-11-05 06:16:28 -0500 | [diff] [blame] | 1884 | cdp->err = nfserr_eof; /* will be cleared on successful read */ |
David Woodhouse | 14f7dd6 | 2008-07-31 20:29:12 +0100 | [diff] [blame] | 1885 | buf.used = 0; |
Al Viro | 53c9c5c | 2008-08-24 07:29:52 -0400 | [diff] [blame] | 1886 | buf.full = 0; |
David Woodhouse | 14f7dd6 | 2008-07-31 20:29:12 +0100 | [diff] [blame] | 1887 | |
Al Viro | 5c0ba4e | 2013-05-15 13:52:59 -0400 | [diff] [blame] | 1888 | host_err = iterate_dir(file, &buf.ctx); |
Al Viro | 53c9c5c | 2008-08-24 07:29:52 -0400 | [diff] [blame] | 1889 | if (buf.full) |
| 1890 | host_err = 0; |
| 1891 | |
| 1892 | if (host_err < 0) |
David Woodhouse | 14f7dd6 | 2008-07-31 20:29:12 +0100 | [diff] [blame] | 1893 | break; |
| 1894 | |
| 1895 | size = buf.used; |
| 1896 | |
| 1897 | if (!size) |
| 1898 | break; |
| 1899 | |
David Woodhouse | 14f7dd6 | 2008-07-31 20:29:12 +0100 | [diff] [blame] | 1900 | de = (struct buffered_dirent *)buf.dirent; |
| 1901 | while (size > 0) { |
| 1902 | offset = de->offset; |
| 1903 | |
| 1904 | if (func(cdp, de->name, de->namlen, de->offset, |
| 1905 | de->ino, de->d_type)) |
David Woodhouse | 2f9092e | 2009-04-20 23:18:37 +0100 | [diff] [blame] | 1906 | break; |
David Woodhouse | 14f7dd6 | 2008-07-31 20:29:12 +0100 | [diff] [blame] | 1907 | |
| 1908 | if (cdp->err != nfs_ok) |
David Woodhouse | 2f9092e | 2009-04-20 23:18:37 +0100 | [diff] [blame] | 1909 | break; |
David Woodhouse | 14f7dd6 | 2008-07-31 20:29:12 +0100 | [diff] [blame] | 1910 | |
| 1911 | reclen = ALIGN(sizeof(*de) + de->namlen, |
| 1912 | sizeof(u64)); |
| 1913 | size -= reclen; |
| 1914 | de = (struct buffered_dirent *)((char *)de + reclen); |
| 1915 | } |
David Woodhouse | 2f9092e | 2009-04-20 23:18:37 +0100 | [diff] [blame] | 1916 | if (size > 0) /* We bailed out early */ |
| 1917 | break; |
| 1918 | |
David Woodhouse | c002a6c | 2008-08-17 17:21:18 +0100 | [diff] [blame] | 1919 | offset = vfs_llseek(file, 0, SEEK_CUR); |
David Woodhouse | 14f7dd6 | 2008-07-31 20:29:12 +0100 | [diff] [blame] | 1920 | } |
| 1921 | |
David Woodhouse | 14f7dd6 | 2008-07-31 20:29:12 +0100 | [diff] [blame] | 1922 | free_page((unsigned long)(buf.dirent)); |
David Woodhouse | 2628b76 | 2008-07-31 17:16:51 +0100 | [diff] [blame] | 1923 | |
| 1924 | if (host_err) |
| 1925 | return nfserrno(host_err); |
David Woodhouse | 14f7dd6 | 2008-07-31 20:29:12 +0100 | [diff] [blame] | 1926 | |
| 1927 | *offsetp = offset; |
| 1928 | return cdp->err; |
David Woodhouse | 2628b76 | 2008-07-31 17:16:51 +0100 | [diff] [blame] | 1929 | } |
| 1930 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1931 | /* |
| 1932 | * Read entries from a directory. |
| 1933 | * The NFSv3/4 verifier we ignore for now. |
| 1934 | */ |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1935 | __be32 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1936 | nfsd_readdir(struct svc_rqst *rqstp, struct svc_fh *fhp, loff_t *offsetp, |
Miklos Szeredi | ac7576f | 2014-10-30 17:37:34 +0100 | [diff] [blame] | 1937 | struct readdir_cd *cdp, nfsd_filldir_t func) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1938 | { |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1939 | __be32 err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1940 | struct file *file; |
| 1941 | loff_t offset = *offsetp; |
Bernd Schubert | 06effdb | 2012-03-18 22:44:50 -0400 | [diff] [blame] | 1942 | int may_flags = NFSD_MAY_READ; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1943 | |
Bernd Schubert | 06effdb | 2012-03-18 22:44:50 -0400 | [diff] [blame] | 1944 | /* NFSv2 only supports 32 bit cookies */ |
| 1945 | if (rqstp->rq_vers > 2) |
| 1946 | may_flags |= NFSD_MAY_64BIT_COOKIE; |
| 1947 | |
| 1948 | err = nfsd_open(rqstp, fhp, S_IFDIR, may_flags, &file); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1949 | if (err) |
| 1950 | goto out; |
| 1951 | |
Jeff Layton | b108fe6 | 2012-04-25 15:30:00 -0400 | [diff] [blame] | 1952 | offset = vfs_llseek(file, offset, SEEK_SET); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1953 | if (offset < 0) { |
| 1954 | err = nfserrno((int)offset); |
| 1955 | goto out_close; |
| 1956 | } |
| 1957 | |
David Woodhouse | 14f7dd6 | 2008-07-31 20:29:12 +0100 | [diff] [blame] | 1958 | err = nfsd_buffered_readdir(file, func, cdp, offsetp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1959 | |
| 1960 | if (err == nfserr_eof || err == nfserr_toosmall) |
| 1961 | err = nfs_ok; /* can still be found in ->err */ |
| 1962 | out_close: |
Christoph Hellwig | fd89145 | 2015-04-28 15:41:16 +0200 | [diff] [blame] | 1963 | fput(file); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1964 | out: |
| 1965 | return err; |
| 1966 | } |
| 1967 | |
| 1968 | /* |
| 1969 | * Get file system stats |
| 1970 | * N.B. After this call fhp needs an fh_put |
| 1971 | */ |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1972 | __be32 |
J. Bruce Fields | 04716e6 | 2008-08-07 13:00:20 -0400 | [diff] [blame] | 1973 | 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] | 1974 | { |
Christoph Hellwig | ebabe9a | 2010-07-07 18:53:11 +0200 | [diff] [blame] | 1975 | __be32 err; |
| 1976 | |
| 1977 | err = fh_verify(rqstp, fhp, 0, NFSD_MAY_NOP | access); |
Takashi Iwai | f6360ef | 2010-08-13 15:53:49 +0200 | [diff] [blame] | 1978 | if (!err) { |
| 1979 | struct path path = { |
| 1980 | .mnt = fhp->fh_export->ex_path.mnt, |
| 1981 | .dentry = fhp->fh_dentry, |
| 1982 | }; |
| 1983 | if (vfs_statfs(&path, stat)) |
| 1984 | err = nfserr_io; |
| 1985 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1986 | return err; |
| 1987 | } |
| 1988 | |
J. Bruce Fields | c7d5140 | 2007-07-19 01:49:20 -0700 | [diff] [blame] | 1989 | 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] | 1990 | { |
J. Bruce Fields | c7d5140 | 2007-07-19 01:49:20 -0700 | [diff] [blame] | 1991 | return nfsexp_flags(rqstp, exp) & NFSEXP_READONLY; |
J. Bruce Fields | e22841c | 2007-07-19 01:49:20 -0700 | [diff] [blame] | 1992 | } |
| 1993 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1994 | /* |
| 1995 | * Check for a user's access permissions to this inode. |
| 1996 | */ |
Al Viro | 6264d69 | 2006-10-19 23:28:58 -0700 | [diff] [blame] | 1997 | __be32 |
J. Bruce Fields | 0ec757d | 2007-07-17 04:04:48 -0700 | [diff] [blame] | 1998 | nfsd_permission(struct svc_rqst *rqstp, struct svc_export *exp, |
| 1999 | struct dentry *dentry, int acc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2000 | { |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 2001 | struct inode *inode = d_inode(dentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2002 | int err; |
| 2003 | |
J. Bruce Fields | aea9339 | 2011-04-10 10:35:12 -0400 | [diff] [blame] | 2004 | if ((acc & NFSD_MAY_MASK) == NFSD_MAY_NOP) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2005 | return 0; |
| 2006 | #if 0 |
| 2007 | dprintk("nfsd: permission 0x%x%s%s%s%s%s%s%s mode 0%o%s%s%s\n", |
| 2008 | acc, |
Miklos Szeredi | 8837abc | 2008-06-16 13:20:29 +0200 | [diff] [blame] | 2009 | (acc & NFSD_MAY_READ)? " read" : "", |
| 2010 | (acc & NFSD_MAY_WRITE)? " write" : "", |
| 2011 | (acc & NFSD_MAY_EXEC)? " exec" : "", |
| 2012 | (acc & NFSD_MAY_SATTR)? " sattr" : "", |
| 2013 | (acc & NFSD_MAY_TRUNC)? " trunc" : "", |
| 2014 | (acc & NFSD_MAY_LOCK)? " lock" : "", |
| 2015 | (acc & NFSD_MAY_OWNER_OVERRIDE)? " owneroverride" : "", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2016 | inode->i_mode, |
| 2017 | IS_IMMUTABLE(inode)? " immut" : "", |
| 2018 | IS_APPEND(inode)? " append" : "", |
Dave Hansen | 2c463e9 | 2008-02-15 14:37:56 -0800 | [diff] [blame] | 2019 | __mnt_is_readonly(exp->ex_path.mnt)? " ro" : ""); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2020 | dprintk(" owner %d/%d user %d/%d\n", |
David Howells | 5cc0a84 | 2008-11-14 10:38:58 +1100 | [diff] [blame] | 2021 | inode->i_uid, inode->i_gid, current_fsuid(), current_fsgid()); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2022 | #endif |
| 2023 | |
| 2024 | /* Normally we reject any write/sattr etc access on a read-only file |
| 2025 | * system. But if it is IRIX doing check on write-access for a |
| 2026 | * device special file, we ignore rofs. |
| 2027 | */ |
Miklos Szeredi | 8837abc | 2008-06-16 13:20:29 +0200 | [diff] [blame] | 2028 | if (!(acc & NFSD_MAY_LOCAL_ACCESS)) |
| 2029 | if (acc & (NFSD_MAY_WRITE | NFSD_MAY_SATTR | NFSD_MAY_TRUNC)) { |
Dave Hansen | 2c463e9 | 2008-02-15 14:37:56 -0800 | [diff] [blame] | 2030 | if (exp_rdonly(rqstp, exp) || |
| 2031 | __mnt_is_readonly(exp->ex_path.mnt)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2032 | return nfserr_rofs; |
Miklos Szeredi | 8837abc | 2008-06-16 13:20:29 +0200 | [diff] [blame] | 2033 | if (/* (acc & NFSD_MAY_WRITE) && */ IS_IMMUTABLE(inode)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2034 | return nfserr_perm; |
| 2035 | } |
Miklos Szeredi | 8837abc | 2008-06-16 13:20:29 +0200 | [diff] [blame] | 2036 | if ((acc & NFSD_MAY_TRUNC) && IS_APPEND(inode)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2037 | return nfserr_perm; |
| 2038 | |
Miklos Szeredi | 8837abc | 2008-06-16 13:20:29 +0200 | [diff] [blame] | 2039 | if (acc & NFSD_MAY_LOCK) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2040 | /* If we cannot rely on authentication in NLM requests, |
| 2041 | * just allow locks, otherwise require read permission, or |
| 2042 | * ownership |
| 2043 | */ |
| 2044 | if (exp->ex_flags & NFSEXP_NOAUTHNLM) |
| 2045 | return 0; |
| 2046 | else |
Miklos Szeredi | 8837abc | 2008-06-16 13:20:29 +0200 | [diff] [blame] | 2047 | acc = NFSD_MAY_READ | NFSD_MAY_OWNER_OVERRIDE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2048 | } |
| 2049 | /* |
| 2050 | * The file owner always gets access permission for accesses that |
| 2051 | * would normally be checked at open time. This is to make |
| 2052 | * file access work even when the client has done a fchmod(fd, 0). |
| 2053 | * |
| 2054 | * However, `cp foo bar' should fail nevertheless when bar is |
| 2055 | * readonly. A sensible way to do this might be to reject all |
| 2056 | * attempts to truncate a read-only file, because a creat() call |
| 2057 | * always implies file truncation. |
| 2058 | * ... but this isn't really fair. A process may reasonably call |
| 2059 | * ftruncate on an open file descriptor on a file with perm 000. |
| 2060 | * We must trust the client to do permission checking - using "ACCESS" |
| 2061 | * with NFSv3. |
| 2062 | */ |
Miklos Szeredi | 8837abc | 2008-06-16 13:20:29 +0200 | [diff] [blame] | 2063 | if ((acc & NFSD_MAY_OWNER_OVERRIDE) && |
Eric W. Biederman | 6fab877 | 2013-02-02 06:53:11 -0800 | [diff] [blame] | 2064 | uid_eq(inode->i_uid, current_fsuid())) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2065 | return 0; |
| 2066 | |
Miklos Szeredi | 8837abc | 2008-06-16 13:20:29 +0200 | [diff] [blame] | 2067 | /* This assumes NFSD_MAY_{READ,WRITE,EXEC} == MAY_{READ,WRITE,EXEC} */ |
Al Viro | f419a2e | 2008-07-22 00:07:17 -0400 | [diff] [blame] | 2068 | err = inode_permission(inode, acc & (MAY_READ|MAY_WRITE|MAY_EXEC)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2069 | |
| 2070 | /* Allow read access to binaries even when mode 111 */ |
| 2071 | if (err == -EACCES && S_ISREG(inode->i_mode) && |
J. Bruce Fields | a043226 | 2011-08-25 10:48:39 -0400 | [diff] [blame] | 2072 | (acc == (NFSD_MAY_READ | NFSD_MAY_OWNER_OVERRIDE) || |
| 2073 | acc == (NFSD_MAY_READ | NFSD_MAY_READ_IF_EXEC))) |
Al Viro | f419a2e | 2008-07-22 00:07:17 -0400 | [diff] [blame] | 2074 | err = inode_permission(inode, MAY_EXEC); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2075 | |
| 2076 | return err? nfserrno(err) : 0; |
| 2077 | } |
| 2078 | |
| 2079 | void |
| 2080 | nfsd_racache_shutdown(void) |
| 2081 | { |
Jeff Layton | 54a66e5 | 2008-08-13 22:03:27 -0400 | [diff] [blame] | 2082 | struct raparms *raparm, *last_raparm; |
| 2083 | unsigned int i; |
| 2084 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2085 | dprintk("nfsd: freeing readahead buffers.\n"); |
Jeff Layton | 54a66e5 | 2008-08-13 22:03:27 -0400 | [diff] [blame] | 2086 | |
| 2087 | for (i = 0; i < RAPARM_HASH_SIZE; i++) { |
| 2088 | raparm = raparm_hash[i].pb_head; |
| 2089 | while(raparm) { |
| 2090 | last_raparm = raparm; |
| 2091 | raparm = raparm->p_next; |
| 2092 | kfree(last_raparm); |
| 2093 | } |
| 2094 | raparm_hash[i].pb_head = NULL; |
| 2095 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2096 | } |
| 2097 | /* |
| 2098 | * Initialize readahead param cache |
| 2099 | */ |
| 2100 | int |
| 2101 | nfsd_racache_init(int cache_size) |
| 2102 | { |
| 2103 | int i; |
Greg Banks | fce1456 | 2006-10-04 02:15:49 -0700 | [diff] [blame] | 2104 | int j = 0; |
| 2105 | int nperbucket; |
Jeff Layton | 54a66e5 | 2008-08-13 22:03:27 -0400 | [diff] [blame] | 2106 | struct raparms **raparm = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2107 | |
Greg Banks | fce1456 | 2006-10-04 02:15:49 -0700 | [diff] [blame] | 2108 | |
Jeff Layton | 54a66e5 | 2008-08-13 22:03:27 -0400 | [diff] [blame] | 2109 | if (raparm_hash[0].pb_head) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2110 | return 0; |
Jeff Layton | 54a66e5 | 2008-08-13 22:03:27 -0400 | [diff] [blame] | 2111 | nperbucket = DIV_ROUND_UP(cache_size, RAPARM_HASH_SIZE); |
Kinglong Mee | 3c7aa15 | 2014-06-10 18:08:19 +0800 | [diff] [blame] | 2112 | nperbucket = max(2, nperbucket); |
Jeff Layton | 54a66e5 | 2008-08-13 22:03:27 -0400 | [diff] [blame] | 2113 | cache_size = nperbucket * RAPARM_HASH_SIZE; |
Yan Burman | 4b3bb06 | 2006-12-08 02:39:41 -0800 | [diff] [blame] | 2114 | |
| 2115 | dprintk("nfsd: allocating %d readahead buffers.\n", cache_size); |
Jeff Layton | 54a66e5 | 2008-08-13 22:03:27 -0400 | [diff] [blame] | 2116 | |
| 2117 | for (i = 0; i < RAPARM_HASH_SIZE; i++) { |
Yan Burman | 4b3bb06 | 2006-12-08 02:39:41 -0800 | [diff] [blame] | 2118 | spin_lock_init(&raparm_hash[i].pb_lock); |
Jeff Layton | 54a66e5 | 2008-08-13 22:03:27 -0400 | [diff] [blame] | 2119 | |
| 2120 | raparm = &raparm_hash[i].pb_head; |
| 2121 | for (j = 0; j < nperbucket; j++) { |
| 2122 | *raparm = kzalloc(sizeof(struct raparms), GFP_KERNEL); |
| 2123 | if (!*raparm) |
| 2124 | goto out_nomem; |
| 2125 | raparm = &(*raparm)->p_next; |
| 2126 | } |
| 2127 | *raparm = NULL; |
Yan Burman | 4b3bb06 | 2006-12-08 02:39:41 -0800 | [diff] [blame] | 2128 | } |
| 2129 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2130 | nfsdstats.ra_size = cache_size; |
| 2131 | return 0; |
Jeff Layton | 54a66e5 | 2008-08-13 22:03:27 -0400 | [diff] [blame] | 2132 | |
| 2133 | out_nomem: |
| 2134 | dprintk("nfsd: kmalloc failed, freeing readahead buffers\n"); |
| 2135 | nfsd_racache_shutdown(); |
| 2136 | return -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2137 | } |