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> |
| 19 | #include <linux/sched.h> |
| 20 | #include <linux/slab.h> |
| 21 | #include <linux/fs.h> |
| 22 | #include <linux/pagemap.h> |
| 23 | #include "volume.h" |
| 24 | #include "vnode.h" |
| 25 | #include "super.h" |
| 26 | #include "internal.h" |
| 27 | |
| 28 | struct afs_iget_data { |
| 29 | struct afs_fid fid; |
| 30 | struct afs_volume *volume; /* volume on which resides */ |
| 31 | }; |
| 32 | |
| 33 | /*****************************************************************************/ |
| 34 | /* |
| 35 | * map the AFS file status to the inode member variables |
| 36 | */ |
| 37 | static int afs_inode_map_status(struct afs_vnode *vnode) |
| 38 | { |
| 39 | struct inode *inode = AFS_VNODE_TO_I(vnode); |
| 40 | |
| 41 | _debug("FS: ft=%d lk=%d sz=%Zu ver=%Lu mod=%hu", |
| 42 | vnode->status.type, |
| 43 | vnode->status.nlink, |
| 44 | vnode->status.size, |
| 45 | vnode->status.version, |
| 46 | vnode->status.mode); |
| 47 | |
| 48 | switch (vnode->status.type) { |
| 49 | case AFS_FTYPE_FILE: |
| 50 | inode->i_mode = S_IFREG | vnode->status.mode; |
| 51 | inode->i_op = &afs_file_inode_operations; |
Christoph Hellwig | a463ddd | 2005-11-07 00:59:46 -0800 | [diff] [blame] | 52 | inode->i_fop = &generic_ro_fops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 53 | break; |
| 54 | case AFS_FTYPE_DIR: |
| 55 | inode->i_mode = S_IFDIR | vnode->status.mode; |
| 56 | inode->i_op = &afs_dir_inode_operations; |
| 57 | inode->i_fop = &afs_dir_file_operations; |
| 58 | break; |
| 59 | case AFS_FTYPE_SYMLINK: |
| 60 | inode->i_mode = S_IFLNK | vnode->status.mode; |
| 61 | inode->i_op = &page_symlink_inode_operations; |
| 62 | break; |
| 63 | default: |
| 64 | printk("kAFS: AFS vnode with undefined type\n"); |
| 65 | return -EBADMSG; |
| 66 | } |
| 67 | |
| 68 | inode->i_nlink = vnode->status.nlink; |
| 69 | inode->i_uid = vnode->status.owner; |
| 70 | inode->i_gid = 0; |
| 71 | inode->i_size = vnode->status.size; |
| 72 | inode->i_ctime.tv_sec = vnode->status.mtime_server; |
| 73 | inode->i_ctime.tv_nsec = 0; |
| 74 | inode->i_atime = inode->i_mtime = inode->i_ctime; |
| 75 | inode->i_blksize = PAGE_CACHE_SIZE; |
| 76 | inode->i_blocks = 0; |
| 77 | inode->i_version = vnode->fid.unique; |
| 78 | inode->i_mapping->a_ops = &afs_fs_aops; |
| 79 | |
| 80 | /* check to see whether a symbolic link is really a mountpoint */ |
| 81 | if (vnode->status.type == AFS_FTYPE_SYMLINK) { |
| 82 | afs_mntpt_check_symlink(vnode); |
| 83 | |
| 84 | if (vnode->flags & AFS_VNODE_MOUNTPOINT) { |
| 85 | inode->i_mode = S_IFDIR | vnode->status.mode; |
| 86 | inode->i_op = &afs_mntpt_inode_operations; |
| 87 | inode->i_fop = &afs_mntpt_file_operations; |
| 88 | } |
| 89 | } |
| 90 | |
| 91 | return 0; |
| 92 | } /* end afs_inode_map_status() */ |
| 93 | |
| 94 | /*****************************************************************************/ |
| 95 | /* |
| 96 | * attempt to fetch the status of an inode, coelescing multiple simultaneous |
| 97 | * fetches |
| 98 | */ |
| 99 | static int afs_inode_fetch_status(struct inode *inode) |
| 100 | { |
| 101 | struct afs_vnode *vnode; |
| 102 | int ret; |
| 103 | |
| 104 | vnode = AFS_FS_I(inode); |
| 105 | |
| 106 | ret = afs_vnode_fetch_status(vnode); |
| 107 | |
| 108 | if (ret == 0) |
| 109 | ret = afs_inode_map_status(vnode); |
| 110 | |
| 111 | return ret; |
| 112 | |
| 113 | } /* end afs_inode_fetch_status() */ |
| 114 | |
| 115 | /*****************************************************************************/ |
| 116 | /* |
| 117 | * iget5() comparator |
| 118 | */ |
| 119 | static int afs_iget5_test(struct inode *inode, void *opaque) |
| 120 | { |
| 121 | struct afs_iget_data *data = opaque; |
| 122 | |
| 123 | return inode->i_ino == data->fid.vnode && |
| 124 | inode->i_version == data->fid.unique; |
| 125 | } /* end afs_iget5_test() */ |
| 126 | |
| 127 | /*****************************************************************************/ |
| 128 | /* |
| 129 | * iget5() inode initialiser |
| 130 | */ |
| 131 | static int afs_iget5_set(struct inode *inode, void *opaque) |
| 132 | { |
| 133 | struct afs_iget_data *data = opaque; |
| 134 | struct afs_vnode *vnode = AFS_FS_I(inode); |
| 135 | |
| 136 | inode->i_ino = data->fid.vnode; |
| 137 | inode->i_version = data->fid.unique; |
| 138 | vnode->fid = data->fid; |
| 139 | vnode->volume = data->volume; |
| 140 | |
| 141 | return 0; |
| 142 | } /* end afs_iget5_set() */ |
| 143 | |
| 144 | /*****************************************************************************/ |
| 145 | /* |
| 146 | * inode retrieval |
| 147 | */ |
| 148 | inline int afs_iget(struct super_block *sb, struct afs_fid *fid, |
| 149 | struct inode **_inode) |
| 150 | { |
| 151 | struct afs_iget_data data = { .fid = *fid }; |
| 152 | struct afs_super_info *as; |
| 153 | struct afs_vnode *vnode; |
| 154 | struct inode *inode; |
| 155 | int ret; |
| 156 | |
| 157 | _enter(",{%u,%u,%u},,", fid->vid, fid->vnode, fid->unique); |
| 158 | |
| 159 | as = sb->s_fs_info; |
| 160 | data.volume = as->volume; |
| 161 | |
| 162 | inode = iget5_locked(sb, fid->vnode, afs_iget5_test, afs_iget5_set, |
| 163 | &data); |
| 164 | if (!inode) { |
| 165 | _leave(" = -ENOMEM"); |
| 166 | return -ENOMEM; |
| 167 | } |
| 168 | |
| 169 | vnode = AFS_FS_I(inode); |
| 170 | |
| 171 | /* deal with an existing inode */ |
| 172 | if (!(inode->i_state & I_NEW)) { |
| 173 | ret = afs_vnode_fetch_status(vnode); |
| 174 | if (ret==0) |
| 175 | *_inode = inode; |
| 176 | else |
| 177 | iput(inode); |
| 178 | _leave(" = %d", ret); |
| 179 | return ret; |
| 180 | } |
| 181 | |
| 182 | #ifdef AFS_CACHING_SUPPORT |
| 183 | /* set up caching before reading the status, as fetch-status reads the |
| 184 | * first page of symlinks to see if they're really mntpts */ |
| 185 | cachefs_acquire_cookie(vnode->volume->cache, |
| 186 | NULL, |
| 187 | vnode, |
| 188 | &vnode->cache); |
| 189 | #endif |
| 190 | |
| 191 | /* okay... it's a new inode */ |
| 192 | inode->i_flags |= S_NOATIME; |
| 193 | vnode->flags |= AFS_VNODE_CHANGED; |
| 194 | ret = afs_inode_fetch_status(inode); |
| 195 | if (ret<0) |
| 196 | goto bad_inode; |
| 197 | |
| 198 | /* success */ |
| 199 | unlock_new_inode(inode); |
| 200 | |
| 201 | *_inode = inode; |
| 202 | _leave(" = 0 [CB { v=%u x=%lu t=%u }]", |
| 203 | vnode->cb_version, |
| 204 | vnode->cb_timeout.timo_jif, |
| 205 | vnode->cb_type); |
| 206 | return 0; |
| 207 | |
| 208 | /* failure */ |
| 209 | bad_inode: |
| 210 | make_bad_inode(inode); |
| 211 | unlock_new_inode(inode); |
| 212 | iput(inode); |
| 213 | |
| 214 | _leave(" = %d [bad]", ret); |
| 215 | return ret; |
| 216 | } /* end afs_iget() */ |
| 217 | |
| 218 | /*****************************************************************************/ |
| 219 | /* |
| 220 | * read the attributes of an inode |
| 221 | */ |
| 222 | int afs_inode_getattr(struct vfsmount *mnt, struct dentry *dentry, |
| 223 | struct kstat *stat) |
| 224 | { |
| 225 | struct afs_vnode *vnode; |
| 226 | struct inode *inode; |
| 227 | int ret; |
| 228 | |
| 229 | inode = dentry->d_inode; |
| 230 | |
| 231 | _enter("{ ino=%lu v=%lu }", inode->i_ino, inode->i_version); |
| 232 | |
| 233 | vnode = AFS_FS_I(inode); |
| 234 | |
| 235 | ret = afs_inode_fetch_status(inode); |
| 236 | if (ret == -ENOENT) { |
| 237 | _leave(" = %d [%d %p]", |
| 238 | ret, atomic_read(&dentry->d_count), dentry->d_inode); |
| 239 | return ret; |
| 240 | } |
| 241 | else if (ret < 0) { |
| 242 | make_bad_inode(inode); |
| 243 | _leave(" = %d", ret); |
| 244 | return ret; |
| 245 | } |
| 246 | |
| 247 | /* transfer attributes from the inode structure to the stat |
| 248 | * structure */ |
| 249 | generic_fillattr(inode, stat); |
| 250 | |
| 251 | _leave(" = 0 CB { v=%u x=%u t=%u }", |
| 252 | vnode->cb_version, |
| 253 | vnode->cb_expiry, |
| 254 | vnode->cb_type); |
| 255 | |
| 256 | return 0; |
| 257 | } /* end afs_inode_getattr() */ |
| 258 | |
| 259 | /*****************************************************************************/ |
| 260 | /* |
| 261 | * clear an AFS inode |
| 262 | */ |
| 263 | void afs_clear_inode(struct inode *inode) |
| 264 | { |
| 265 | struct afs_vnode *vnode; |
| 266 | |
| 267 | vnode = AFS_FS_I(inode); |
| 268 | |
| 269 | _enter("ino=%lu { vn=%08x v=%u x=%u t=%u }", |
| 270 | inode->i_ino, |
| 271 | vnode->fid.vnode, |
| 272 | vnode->cb_version, |
| 273 | vnode->cb_expiry, |
| 274 | vnode->cb_type |
| 275 | ); |
| 276 | |
| 277 | BUG_ON(inode->i_ino != vnode->fid.vnode); |
| 278 | |
| 279 | afs_vnode_give_up_callback(vnode); |
| 280 | |
| 281 | #ifdef AFS_CACHING_SUPPORT |
| 282 | cachefs_relinquish_cookie(vnode->cache, 0); |
| 283 | vnode->cache = NULL; |
| 284 | #endif |
| 285 | |
| 286 | _leave(""); |
| 287 | } /* end afs_clear_inode() */ |