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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 | /* * Copyright (c) 2002 Red Hat, Inc. All rights reserved. * * This software may be freely redistributed under the terms of the * GNU General Public License. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. * * Authors: David Woodhouse <dwmw2@cambridge.redhat.com> * David Howells <dhowells@redhat.com> * */ #include <linux/kernel.h> #include <linux/module.h> #include <linux/init.h> #include <linux/slab.h> #include <linux/fs.h> #include <linux/pagemap.h> #include "volume.h" #include "vnode.h" #include "super.h" #include "internal.h" struct afs_iget_data { struct afs_fid fid; struct afs_volume *volume; /* volume on which resides */ }; /*****************************************************************************/ /* * map the AFS file status to the inode member variables */ static int afs_inode_map_status(struct afs_vnode *vnode) { struct inode *inode = AFS_VNODE_TO_I(vnode); _debug("FS: ft=%d lk=%d sz=%Zu ver=%Lu mod=%hu", vnode->status.type, vnode->status.nlink, vnode->status.size, vnode->status.version, vnode->status.mode); switch (vnode->status.type) { case AFS_FTYPE_FILE: inode->i_mode = S_IFREG | vnode->status.mode; inode->i_op = &afs_file_inode_operations; inode->i_fop = &generic_ro_fops; break; case AFS_FTYPE_DIR: inode->i_mode = S_IFDIR | vnode->status.mode; inode->i_op = &afs_dir_inode_operations; inode->i_fop = &afs_dir_file_operations; break; case AFS_FTYPE_SYMLINK: inode->i_mode = S_IFLNK | vnode->status.mode; inode->i_op = &page_symlink_inode_operations; break; default: printk("kAFS: AFS vnode with undefined type\n"); return -EBADMSG; } inode->i_nlink = vnode->status.nlink; inode->i_uid = vnode->status.owner; inode->i_gid = 0; inode->i_size = vnode->status.size; inode->i_ctime.tv_sec = vnode->status.mtime_server; inode->i_ctime.tv_nsec = 0; inode->i_atime = inode->i_mtime = inode->i_ctime; inode->i_blocks = 0; inode->i_version = vnode->fid.unique; inode->i_mapping->a_ops = &afs_fs_aops; /* check to see whether a symbolic link is really a mountpoint */ if (vnode->status.type == AFS_FTYPE_SYMLINK) { afs_mntpt_check_symlink(vnode); if (vnode->flags & AFS_VNODE_MOUNTPOINT) { inode->i_mode = S_IFDIR | vnode->status.mode; inode->i_op = &afs_mntpt_inode_operations; inode->i_fop = &afs_mntpt_file_operations; } } return 0; } /* end afs_inode_map_status() */ /*****************************************************************************/ /* * attempt to fetch the status of an inode, coelescing multiple simultaneous * fetches */ static int afs_inode_fetch_status(struct inode *inode) { struct afs_vnode *vnode; int ret; vnode = AFS_FS_I(inode); ret = afs_vnode_fetch_status(vnode); if (ret == 0) ret = afs_inode_map_status(vnode); return ret; } /* end afs_inode_fetch_status() */ /*****************************************************************************/ /* * iget5() comparator */ static int afs_iget5_test(struct inode *inode, void *opaque) { struct afs_iget_data *data = opaque; return inode->i_ino == data->fid.vnode && inode->i_version == data->fid.unique; } /* end afs_iget5_test() */ /*****************************************************************************/ /* * iget5() inode initialiser */ static int afs_iget5_set(struct inode *inode, void *opaque) { struct afs_iget_data *data = opaque; struct afs_vnode *vnode = AFS_FS_I(inode); inode->i_ino = data->fid.vnode; inode->i_version = data->fid.unique; vnode->fid = data->fid; vnode->volume = data->volume; return 0; } /* end afs_iget5_set() */ /*****************************************************************************/ /* * inode retrieval */ inline int afs_iget(struct super_block *sb, struct afs_fid *fid, struct inode **_inode) { struct afs_iget_data data = { .fid = *fid }; struct afs_super_info *as; struct afs_vnode *vnode; struct inode *inode; int ret; _enter(",{%u,%u,%u},,", fid->vid, fid->vnode, fid->unique); as = sb->s_fs_info; data.volume = as->volume; inode = iget5_locked(sb, fid->vnode, afs_iget5_test, afs_iget5_set, &data); if (!inode) { _leave(" = -ENOMEM"); return -ENOMEM; } vnode = AFS_FS_I(inode); /* deal with an existing inode */ if (!(inode->i_state & I_NEW)) { ret = afs_vnode_fetch_status(vnode); if (ret==0) *_inode = inode; else iput(inode); _leave(" = %d", ret); return ret; } #ifdef AFS_CACHING_SUPPORT /* set up caching before reading the status, as fetch-status reads the * first page of symlinks to see if they're really mntpts */ cachefs_acquire_cookie(vnode->volume->cache, NULL, vnode, &vnode->cache); #endif /* okay... it's a new inode */ inode->i_flags |= S_NOATIME; vnode->flags |= AFS_VNODE_CHANGED; ret = afs_inode_fetch_status(inode); if (ret<0) goto bad_inode; /* success */ unlock_new_inode(inode); *_inode = inode; _leave(" = 0 [CB { v=%u x=%lu t=%u }]", vnode->cb_version, vnode->cb_timeout.timo_jif, vnode->cb_type); return 0; /* failure */ bad_inode: make_bad_inode(inode); unlock_new_inode(inode); iput(inode); _leave(" = %d [bad]", ret); return ret; } /* end afs_iget() */ /*****************************************************************************/ /* * read the attributes of an inode */ int afs_inode_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat) { struct afs_vnode *vnode; struct inode *inode; int ret; inode = dentry->d_inode; _enter("{ ino=%lu v=%lu }", inode->i_ino, inode->i_version); vnode = AFS_FS_I(inode); ret = afs_inode_fetch_status(inode); if (ret == -ENOENT) { _leave(" = %d [%d %p]", ret, atomic_read(&dentry->d_count), dentry->d_inode); return ret; } else if (ret < 0) { make_bad_inode(inode); _leave(" = %d", ret); return ret; } /* transfer attributes from the inode structure to the stat * structure */ generic_fillattr(inode, stat); _leave(" = 0 CB { v=%u x=%u t=%u }", vnode->cb_version, vnode->cb_expiry, vnode->cb_type); return 0; } /* end afs_inode_getattr() */ /*****************************************************************************/ /* * clear an AFS inode */ void afs_clear_inode(struct inode *inode) { struct afs_vnode *vnode; vnode = AFS_FS_I(inode); _enter("ino=%lu { vn=%08x v=%u x=%u t=%u }", inode->i_ino, vnode->fid.vnode, vnode->cb_version, vnode->cb_expiry, vnode->cb_type ); BUG_ON(inode->i_ino != vnode->fid.vnode); afs_vnode_give_up_callback(vnode); #ifdef AFS_CACHING_SUPPORT cachefs_relinquish_cookie(vnode->cache, 0); vnode->cache = NULL; #endif _leave(""); } /* end afs_clear_inode() */ |