Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2002 Red Hat, Inc. All rights reserved. |
| 3 | * |
| 4 | * This software may be freely redistributed under the terms of the |
| 5 | * GNU General Public License. |
| 6 | * |
| 7 | * You should have received a copy of the GNU General Public License |
| 8 | * along with this program; if not, write to the Free Software |
| 9 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
| 10 | * |
| 11 | * Authors: David Woodhouse <dwmw2@cambridge.redhat.com> |
| 12 | * David Howells <dhowells@redhat.com> |
| 13 | * |
| 14 | */ |
| 15 | |
| 16 | #include <linux/kernel.h> |
| 17 | #include <linux/module.h> |
| 18 | #include <linux/init.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 19 | #include <linux/slab.h> |
| 20 | #include <linux/fs.h> |
| 21 | #include <linux/pagemap.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 22 | #include "internal.h" |
| 23 | |
| 24 | struct afs_iget_data { |
| 25 | struct afs_fid fid; |
| 26 | struct afs_volume *volume; /* volume on which resides */ |
| 27 | }; |
| 28 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 29 | /* |
| 30 | * map the AFS file status to the inode member variables |
| 31 | */ |
David Howells | 00d3b7a | 2007-04-26 15:57:07 -0700 | [diff] [blame] | 32 | static int afs_inode_map_status(struct afs_vnode *vnode, struct key *key) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 33 | { |
| 34 | struct inode *inode = AFS_VNODE_TO_I(vnode); |
| 35 | |
| 36 | _debug("FS: ft=%d lk=%d sz=%Zu ver=%Lu mod=%hu", |
| 37 | vnode->status.type, |
| 38 | vnode->status.nlink, |
| 39 | vnode->status.size, |
David Howells | 08e0e7c | 2007-04-26 15:55:03 -0700 | [diff] [blame] | 40 | vnode->status.data_version, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 41 | vnode->status.mode); |
| 42 | |
| 43 | switch (vnode->status.type) { |
| 44 | case AFS_FTYPE_FILE: |
| 45 | inode->i_mode = S_IFREG | vnode->status.mode; |
| 46 | inode->i_op = &afs_file_inode_operations; |
David Howells | 00d3b7a | 2007-04-26 15:57:07 -0700 | [diff] [blame] | 47 | inode->i_fop = &afs_file_operations; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 48 | break; |
| 49 | case AFS_FTYPE_DIR: |
| 50 | inode->i_mode = S_IFDIR | vnode->status.mode; |
| 51 | inode->i_op = &afs_dir_inode_operations; |
| 52 | inode->i_fop = &afs_dir_file_operations; |
| 53 | break; |
| 54 | case AFS_FTYPE_SYMLINK: |
| 55 | inode->i_mode = S_IFLNK | vnode->status.mode; |
| 56 | inode->i_op = &page_symlink_inode_operations; |
| 57 | break; |
| 58 | default: |
| 59 | printk("kAFS: AFS vnode with undefined type\n"); |
| 60 | return -EBADMSG; |
| 61 | } |
| 62 | |
| 63 | inode->i_nlink = vnode->status.nlink; |
| 64 | inode->i_uid = vnode->status.owner; |
| 65 | inode->i_gid = 0; |
| 66 | inode->i_size = vnode->status.size; |
| 67 | inode->i_ctime.tv_sec = vnode->status.mtime_server; |
| 68 | inode->i_ctime.tv_nsec = 0; |
| 69 | inode->i_atime = inode->i_mtime = inode->i_ctime; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 70 | inode->i_blocks = 0; |
| 71 | inode->i_version = vnode->fid.unique; |
| 72 | inode->i_mapping->a_ops = &afs_fs_aops; |
| 73 | |
| 74 | /* check to see whether a symbolic link is really a mountpoint */ |
| 75 | if (vnode->status.type == AFS_FTYPE_SYMLINK) { |
David Howells | 00d3b7a | 2007-04-26 15:57:07 -0700 | [diff] [blame] | 76 | afs_mntpt_check_symlink(vnode, key); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 77 | |
David Howells | 08e0e7c | 2007-04-26 15:55:03 -0700 | [diff] [blame] | 78 | if (test_bit(AFS_VNODE_MOUNTPOINT, &vnode->flags)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 79 | inode->i_mode = S_IFDIR | vnode->status.mode; |
| 80 | inode->i_op = &afs_mntpt_inode_operations; |
| 81 | inode->i_fop = &afs_mntpt_file_operations; |
| 82 | } |
| 83 | } |
| 84 | |
| 85 | return 0; |
David Howells | ec26815 | 2007-04-26 15:49:28 -0700 | [diff] [blame] | 86 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 87 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 88 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 89 | * iget5() comparator |
| 90 | */ |
| 91 | static int afs_iget5_test(struct inode *inode, void *opaque) |
| 92 | { |
| 93 | struct afs_iget_data *data = opaque; |
| 94 | |
| 95 | return inode->i_ino == data->fid.vnode && |
| 96 | inode->i_version == data->fid.unique; |
David Howells | ec26815 | 2007-04-26 15:49:28 -0700 | [diff] [blame] | 97 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 98 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 99 | /* |
| 100 | * iget5() inode initialiser |
| 101 | */ |
| 102 | static int afs_iget5_set(struct inode *inode, void *opaque) |
| 103 | { |
| 104 | struct afs_iget_data *data = opaque; |
| 105 | struct afs_vnode *vnode = AFS_FS_I(inode); |
| 106 | |
| 107 | inode->i_ino = data->fid.vnode; |
| 108 | inode->i_version = data->fid.unique; |
| 109 | vnode->fid = data->fid; |
| 110 | vnode->volume = data->volume; |
| 111 | |
| 112 | return 0; |
David Howells | ec26815 | 2007-04-26 15:49:28 -0700 | [diff] [blame] | 113 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 114 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 115 | /* |
| 116 | * inode retrieval |
| 117 | */ |
David Howells | 00d3b7a | 2007-04-26 15:57:07 -0700 | [diff] [blame] | 118 | inline struct inode *afs_iget(struct super_block *sb, struct key *key, |
| 119 | struct afs_fid *fid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 120 | { |
| 121 | struct afs_iget_data data = { .fid = *fid }; |
| 122 | struct afs_super_info *as; |
| 123 | struct afs_vnode *vnode; |
| 124 | struct inode *inode; |
| 125 | int ret; |
| 126 | |
| 127 | _enter(",{%u,%u,%u},,", fid->vid, fid->vnode, fid->unique); |
| 128 | |
| 129 | as = sb->s_fs_info; |
| 130 | data.volume = as->volume; |
| 131 | |
| 132 | inode = iget5_locked(sb, fid->vnode, afs_iget5_test, afs_iget5_set, |
| 133 | &data); |
| 134 | if (!inode) { |
| 135 | _leave(" = -ENOMEM"); |
David Howells | 08e0e7c | 2007-04-26 15:55:03 -0700 | [diff] [blame] | 136 | return ERR_PTR(-ENOMEM); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 137 | } |
| 138 | |
David Howells | 08e0e7c | 2007-04-26 15:55:03 -0700 | [diff] [blame] | 139 | _debug("GOT INODE %p { vl=%x vn=%x, u=%x }", |
| 140 | inode, fid->vid, fid->vnode, fid->unique); |
| 141 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 142 | vnode = AFS_FS_I(inode); |
| 143 | |
| 144 | /* deal with an existing inode */ |
| 145 | if (!(inode->i_state & I_NEW)) { |
David Howells | 08e0e7c | 2007-04-26 15:55:03 -0700 | [diff] [blame] | 146 | _leave(" = %p", inode); |
| 147 | return inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 148 | } |
| 149 | |
| 150 | #ifdef AFS_CACHING_SUPPORT |
| 151 | /* set up caching before reading the status, as fetch-status reads the |
| 152 | * first page of symlinks to see if they're really mntpts */ |
| 153 | cachefs_acquire_cookie(vnode->volume->cache, |
| 154 | NULL, |
| 155 | vnode, |
| 156 | &vnode->cache); |
| 157 | #endif |
| 158 | |
| 159 | /* okay... it's a new inode */ |
David Howells | 08e0e7c | 2007-04-26 15:55:03 -0700 | [diff] [blame] | 160 | set_bit(AFS_VNODE_CB_BROKEN, &vnode->flags); |
David Howells | 00d3b7a | 2007-04-26 15:57:07 -0700 | [diff] [blame] | 161 | ret = afs_vnode_fetch_status(vnode, NULL, key); |
David Howells | 08e0e7c | 2007-04-26 15:55:03 -0700 | [diff] [blame] | 162 | if (ret < 0) |
| 163 | goto bad_inode; |
David Howells | 00d3b7a | 2007-04-26 15:57:07 -0700 | [diff] [blame] | 164 | ret = afs_inode_map_status(vnode, key); |
David Howells | 08e0e7c | 2007-04-26 15:55:03 -0700 | [diff] [blame] | 165 | if (ret < 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 166 | goto bad_inode; |
| 167 | |
| 168 | /* success */ |
David Howells | 08e0e7c | 2007-04-26 15:55:03 -0700 | [diff] [blame] | 169 | inode->i_flags |= S_NOATIME; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 170 | unlock_new_inode(inode); |
David Howells | 08e0e7c | 2007-04-26 15:55:03 -0700 | [diff] [blame] | 171 | _leave(" = %p [CB { v=%u t=%u }]", inode, vnode->cb_version, vnode->cb_type); |
| 172 | return inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 173 | |
| 174 | /* failure */ |
David Howells | ec26815 | 2007-04-26 15:49:28 -0700 | [diff] [blame] | 175 | bad_inode: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 176 | make_bad_inode(inode); |
| 177 | unlock_new_inode(inode); |
| 178 | iput(inode); |
| 179 | |
| 180 | _leave(" = %d [bad]", ret); |
David Howells | 08e0e7c | 2007-04-26 15:55:03 -0700 | [diff] [blame] | 181 | return ERR_PTR(ret); |
David Howells | ec26815 | 2007-04-26 15:49:28 -0700 | [diff] [blame] | 182 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 183 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 184 | /* |
| 185 | * read the attributes of an inode |
| 186 | */ |
| 187 | int afs_inode_getattr(struct vfsmount *mnt, struct dentry *dentry, |
| 188 | struct kstat *stat) |
| 189 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 190 | struct inode *inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 191 | |
| 192 | inode = dentry->d_inode; |
| 193 | |
| 194 | _enter("{ ino=%lu v=%lu }", inode->i_ino, inode->i_version); |
| 195 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 196 | generic_fillattr(inode, stat); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 197 | return 0; |
David Howells | ec26815 | 2007-04-26 15:49:28 -0700 | [diff] [blame] | 198 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 199 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 200 | /* |
| 201 | * clear an AFS inode |
| 202 | */ |
| 203 | void afs_clear_inode(struct inode *inode) |
| 204 | { |
David Howells | 00d3b7a | 2007-04-26 15:57:07 -0700 | [diff] [blame] | 205 | struct afs_permits *permits; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 206 | struct afs_vnode *vnode; |
| 207 | |
| 208 | vnode = AFS_FS_I(inode); |
| 209 | |
| 210 | _enter("ino=%lu { vn=%08x v=%u x=%u t=%u }", |
| 211 | inode->i_ino, |
| 212 | vnode->fid.vnode, |
| 213 | vnode->cb_version, |
| 214 | vnode->cb_expiry, |
David Howells | 08e0e7c | 2007-04-26 15:55:03 -0700 | [diff] [blame] | 215 | vnode->cb_type); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 216 | |
David Howells | 08e0e7c | 2007-04-26 15:55:03 -0700 | [diff] [blame] | 217 | _debug("CLEAR INODE %p", inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 218 | |
David Howells | 08e0e7c | 2007-04-26 15:55:03 -0700 | [diff] [blame] | 219 | ASSERTCMP(inode->i_ino, ==, vnode->fid.vnode); |
| 220 | |
| 221 | afs_give_up_callback(vnode); |
| 222 | |
| 223 | if (vnode->server) { |
| 224 | spin_lock(&vnode->server->fs_lock); |
| 225 | rb_erase(&vnode->server_rb, &vnode->server->fs_vnodes); |
| 226 | spin_unlock(&vnode->server->fs_lock); |
| 227 | afs_put_server(vnode->server); |
| 228 | vnode->server = NULL; |
| 229 | } |
| 230 | |
| 231 | ASSERT(!vnode->cb_promised); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 232 | |
| 233 | #ifdef AFS_CACHING_SUPPORT |
| 234 | cachefs_relinquish_cookie(vnode->cache, 0); |
| 235 | vnode->cache = NULL; |
| 236 | #endif |
| 237 | |
David Howells | 00d3b7a | 2007-04-26 15:57:07 -0700 | [diff] [blame] | 238 | mutex_lock(&vnode->permits_lock); |
| 239 | permits = vnode->permits; |
| 240 | rcu_assign_pointer(vnode->permits, NULL); |
| 241 | mutex_unlock(&vnode->permits_lock); |
| 242 | if (permits) |
| 243 | call_rcu(&permits->rcu, afs_zap_permits); |
| 244 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 245 | _leave(""); |
David Howells | ec26815 | 2007-04-26 15:49:28 -0700 | [diff] [blame] | 246 | } |