/* * 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/sched.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() */