int fuse_reverse_inval_entry(struct super_block *sb, u64 parent_nodeid,
u64 child_nodeid, struct qstr *name)
{
int err = -ENOTDIR;
struct inode *parent;
struct dentry *dir;
struct dentry *entry;
parent = ilookup5(sb, parent_nodeid, fuse_inode_eq, &parent_nodeid);
if (!parent)
return -ENOENT;
inode_lock(parent);
if (!S_ISDIR(parent->i_mode))
goto unlock;
err = -ENOENT;
dir = d_find_alias(parent);
if (!dir)
goto unlock;
name->hash = full_name_hash(dir, name->name, name->len);
entry = d_lookup(dir, name);
dput(dir);
if (!entry)
goto unlock;
fuse_dir_changed(parent);
fuse_invalidate_entry(entry);
if (child_nodeid != 0 && d_really_is_positive(entry)) {
inode_lock(d_inode(entry));
if (get_node_id(d_inode(entry)) != child_nodeid) {
err = -ENOENT;
goto badentry;
}
if (d_mountpoint(entry)) {
err = -EBUSY;
goto badentry;
}
if (d_is_dir(entry)) {
shrink_dcache_parent(entry);
if (!simple_empty(entry)) {
err = -ENOTEMPTY;
goto badentry;
}
d_inode(entry)->i_flags |= S_DEAD;
}
dont_mount(entry);
clear_nlink(d_inode(entry));
err = 0;
badentry:
inode_unlock(d_inode(entry));
if (!err)
d_delete(entry);
} else {
err = 0;
}
dput(entry);
unlock:
inode_unlock(parent);
iput(parent);
return err;
}
static int gfs2_drevalidate(struct dentry *dentry, struct nameidata *nd)
{
struct dentry *parent = dget_parent(dentry);
struct gfs2_sbd *sdp = GFS2_SB(parent->d_inode);
struct gfs2_inode *dip = GFS2_I(parent->d_inode);
struct inode *inode = dentry->d_inode;
struct gfs2_holder d_gh;
struct gfs2_inode *ip = NULL;
int error;
int had_lock=0;
if (inode) {
if (is_bad_inode(inode))
goto invalid;
ip = GFS2_I(inode);
}
if (sdp->sd_args.ar_localcaching)
goto valid;
had_lock = (gfs2_glock_is_locked_by_me(dip->i_gl) != NULL);
if (!had_lock) {
error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh);
if (error)
goto fail;
}
error = gfs2_dir_check(parent->d_inode, &dentry->d_name, ip);
switch (error) {
case 0:
if (!inode)
goto invalid_gunlock;
break;
case -ENOENT:
if (!inode)
goto valid_gunlock;
goto invalid_gunlock;
default:
goto fail_gunlock;
}
valid_gunlock:
if (!had_lock)
gfs2_glock_dq_uninit(&d_gh);
valid:
dput(parent);
return 1;
invalid_gunlock:
if (!had_lock)
gfs2_glock_dq_uninit(&d_gh);
invalid:
if (inode && S_ISDIR(inode->i_mode)) {
if (have_submounts(dentry))
goto valid;
shrink_dcache_parent(dentry);
}
d_drop(dentry);
dput(parent);
return 0;
fail_gunlock:
gfs2_glock_dq_uninit(&d_gh);
fail:
dput(parent);
return 0;
}
int lefuse_reverse_inval_entry(struct super_block *sb, u64 parent_nodeid,
u64 child_nodeid, struct qstr *name)
{
int err = -ENOTDIR;
struct inode *parent;
struct dentry *dir;
struct dentry *entry;
parent = ilookup5(sb, parent_nodeid, lefuse_inode_eq, &parent_nodeid);
if (!parent)
return -ENOENT;
mutex_lock(&parent->i_mutex);
if (!S_ISDIR(parent->i_mode))
goto unlock;
err = -ENOENT;
dir = d_find_alias(parent);
if (!dir)
goto unlock;
entry = d_lookup(dir, name);
dput(dir);
if (!entry)
goto unlock;
lefuse_invalidate_attr(parent);
fuse_invalidate_entry(entry);
if (child_nodeid != 0 && entry->d_inode) {
mutex_lock(&entry->d_inode->i_mutex);
if (get_node_id(entry->d_inode) != child_nodeid) {
err = -ENOENT;
goto badentry;
}
if (d_mountpoint(entry)) {
err = -EBUSY;
goto badentry;
}
if (S_ISDIR(entry->d_inode->i_mode)) {
shrink_dcache_parent(entry);
if (!simple_empty(entry)) {
err = -ENOTEMPTY;
goto badentry;
}
entry->d_inode->i_flags |= S_DEAD;
}
dont_mount(entry);
clear_nlink(entry->d_inode);
err = 0;
badentry:
mutex_unlock(&entry->d_inode->i_mutex);
if (!err)
d_delete(entry);
} else {
err = 0;
}
dput(entry);
unlock:
mutex_unlock(&parent->i_mutex);
iput(parent);
return err;
}
/**
* nilfs_tree_is_busy() - try to shrink dentries of a checkpoint
* @root_dentry: root dentry of the tree to be shrunk
*
* This function returns true if the tree was in-use.
*/
static bool nilfs_tree_is_busy(struct dentry *root_dentry)
{
shrink_dcache_parent(root_dentry);
return d_count(root_dentry) > 1;
}
/*
* Check whether the dentry is still valid
*
* If the entry validity timeout has expired and the dentry is
* positive, try to redo the lookup. If the lookup results in a
* different inode, then let the VFS invalidate the dentry and redo
* the lookup once more. If the lookup results in the same inode,
* then refresh the attributes, timeouts and mark the dentry valid.
*/
static int fuse_dentry_revalidate(struct dentry *entry, struct nameidata *nd)
{
struct inode *inode = entry->d_inode;
struct dentry *parent;
struct fuse_conn *fc;
int ret;
if (inode && is_bad_inode(inode))
goto invalid;
else if (time_before64(fuse_dentry_time(entry), get_jiffies_64()) ||
(nd->flags & LOOKUP_REVAL)) {
int err;
struct fuse_entry_out outarg;
struct fuse_req *req;
struct fuse_forget_link *forget;
u64 attr_version;
/* For negative dentries, always do a fresh lookup */
if (!inode)
goto invalid;
fc = get_fuse_conn(inode);
req = fuse_get_req_nopages(fc);
ret = PTR_ERR(req);
if (IS_ERR(req))
goto out;
forget = fuse_alloc_forget();
if (!forget) {
fuse_put_request(fc, req);
ret = -ENOMEM;
goto out;
}
attr_version = fuse_get_attr_version(fc);
parent = dget_parent(entry);
fuse_lookup_init(fc, req, get_node_id(parent->d_inode),
&entry->d_name, &outarg);
fuse_request_send(fc, req);
dput(parent);
err = req->out.h.error;
fuse_put_request(fc, req);
/* Zero nodeid is same as -ENOENT */
if (!err && !outarg.nodeid)
err = -ENOENT;
if (!err) {
struct fuse_inode *fi = get_fuse_inode(inode);
if (outarg.nodeid != get_node_id(inode)) {
fuse_queue_forget(fc, forget, outarg.nodeid, 1);
goto invalid;
}
spin_lock(&fc->lock);
fi->nlookup++;
spin_unlock(&fc->lock);
}
kfree(forget);
if (err || (outarg.attr.mode ^ inode->i_mode) & S_IFMT)
goto invalid;
fuse_change_attributes(inode, &outarg.attr,
entry_attr_timeout(&outarg),
attr_version);
fuse_change_entry_timeout(entry, &outarg);
} else if (inode) {
fc = get_fuse_conn(inode);
if (fc->readdirplus_auto) {
parent = dget_parent(entry);
fuse_advise_use_readdirplus(parent->d_inode);
dput(parent);
}
}
ret = 1;
out:
return ret;
invalid:
ret = 0;
if (inode) {
if (S_ISDIR(inode->i_mode)) {
if (have_submounts(entry)) {
ret = 1;
goto out;
}
shrink_dcache_parent(entry);
} else {
if (d_mountpoint(entry)) {
ret = 1;
goto out;
}
}
}
d_drop(entry);
goto out;
}
static void sel_remove_entries(struct dentry *de)
{
d_genocide(de);
shrink_dcache_parent(de);
}
static void presto_put_super(struct super_block *sb)
{
struct presto_cache *cache;
struct upc_channel *channel;
struct super_operations *sops;
struct list_head *lh;
int err;
ENTRY;
cache = presto_cache_find(sb->s_dev);
if (!cache) {
EXIT;
goto exit;
}
channel = &izo_channels[presto_c2m(cache)];
sops = filter_c2csops(cache->cache_filter);
err = izo_clear_all_fsetroots(cache);
if (err) {
CERROR("%s: err %d\n", __FUNCTION__, err);
}
PRESTO_FREE(cache->cache_vfsmount, sizeof(struct vfsmount));
/* look at kill_super - fsync_super is not exported GRRR but
probably not needed */
unlock_super(sb);
shrink_dcache_parent(cache->cache_root);
dput(cache->cache_root);
//fsync_super(sb);
lock_super(sb);
if (sops->write_super)
sops->write_super(sb);
if (sops->put_super)
sops->put_super(sb);
/* free any remaining async upcalls when the filesystem is unmounted */
spin_lock(&channel->uc_lock);
lh = channel->uc_pending.next;
while ( lh != &channel->uc_pending) {
struct upc_req *req;
req = list_entry(lh, struct upc_req, rq_chain);
/* assignment must be here: we are about to free &lh */
lh = lh->next;
if ( ! (req->rq_flags & REQ_ASYNC) )
continue;
list_del(&(req->rq_chain));
PRESTO_FREE(req->rq_data, req->rq_bufsize);
PRESTO_FREE(req, sizeof(struct upc_req));
}
list_del(&cache->cache_channel_list);
spin_unlock(&channel->uc_lock);
presto_free_cache(cache);
exit:
CDEBUG(D_MALLOC, "after umount: kmem %ld, vmem %ld\n",
presto_kmemory, presto_vmemory);
MOD_DEC_USE_COUNT;
return ;
}
static int afs_d_revalidate(struct dentry *dentry, struct nameidata *nd)
{
struct afs_vnode *vnode, *dir;
struct afs_fid uninitialized_var(fid);
struct dentry *parent;
struct key *key;
void *dir_version;
int ret;
vnode = AFS_FS_I(dentry->d_inode);
if (dentry->d_inode)
_enter("{v={%x:%u} n=%s fl=%lx},",
vnode->fid.vid, vnode->fid.vnode, dentry->d_name.name,
vnode->flags);
else
_enter("{neg n=%s}", dentry->d_name.name);
key = afs_request_key(AFS_FS_S(dentry->d_sb)->volume->cell);
if (IS_ERR(key))
key = NULL;
/* lock down the parent dentry so we can peer at it */
parent = dget_parent(dentry);
if (!parent->d_inode)
goto out_bad;
dir = AFS_FS_I(parent->d_inode);
/* validate the parent directory */
if (test_bit(AFS_VNODE_MODIFIED, &dir->flags))
afs_validate(dir, key);
if (test_bit(AFS_VNODE_DELETED, &dir->flags)) {
_debug("%s: parent dir deleted", dentry->d_name.name);
goto out_bad;
}
dir_version = (void *) (unsigned long) dir->status.data_version;
if (dentry->d_fsdata == dir_version)
goto out_valid; /* the dir contents are unchanged */
_debug("dir modified");
/* search the directory for this vnode */
ret = afs_do_lookup(&dir->vfs_inode, dentry, &fid, key);
switch (ret) {
case 0:
/* the filename maps to something */
if (!dentry->d_inode)
goto out_bad;
if (is_bad_inode(dentry->d_inode)) {
printk("kAFS: afs_d_revalidate: %s/%s has bad inode\n",
parent->d_name.name, dentry->d_name.name);
goto out_bad;
}
/* if the vnode ID has changed, then the dirent points to a
* different file */
if (fid.vnode != vnode->fid.vnode) {
_debug("%s: dirent changed [%u != %u]",
dentry->d_name.name, fid.vnode,
vnode->fid.vnode);
goto not_found;
}
/* if the vnode ID uniqifier has changed, then the file has
* been deleted and replaced, and the original vnode ID has
* been reused */
if (fid.unique != vnode->fid.unique) {
_debug("%s: file deleted (uq %u -> %u I:%llu)",
dentry->d_name.name, fid.unique,
vnode->fid.unique,
(unsigned long long)dentry->d_inode->i_version);
spin_lock(&vnode->lock);
set_bit(AFS_VNODE_DELETED, &vnode->flags);
spin_unlock(&vnode->lock);
goto not_found;
}
goto out_valid;
case -ENOENT:
/* the filename is unknown */
_debug("%s: dirent not found", dentry->d_name.name);
if (dentry->d_inode)
goto not_found;
goto out_valid;
default:
_debug("failed to iterate dir %s: %d",
parent->d_name.name, ret);
goto out_bad;
}
out_valid:
dentry->d_fsdata = dir_version;
out_skip:
dput(parent);
key_put(key);
_leave(" = 1 [valid]");
return 1;
/* the dirent, if it exists, now points to a different vnode */
not_found:
spin_lock(&dentry->d_lock);
dentry->d_flags |= DCACHE_NFSFS_RENAMED;
spin_unlock(&dentry->d_lock);
out_bad:
if (dentry->d_inode) {
/* don't unhash if we have submounts */
if (have_submounts(dentry))
goto out_skip;
}
_debug("dropping dentry %s/%s",
parent->d_name.name, dentry->d_name.name);
shrink_dcache_parent(dentry);
d_drop(dentry);
dput(parent);
key_put(key);
_leave(" = 0 [bad]");
return 0;
}
/*
* rename uses retrying to avoid race-conditions: at least they should be minimal.
* it tries to allocate all the blocks, then sanity-checks, and if the sanity-
* checks fail, it tries to restart itself again. Very practical - no changes
* are done until we know everything works ok.. and then all the changes can be
* done in one fell swoop when we have claimed all the buffers needed.
*
* Anybody can rename anything with this: the permission checks are left to the
* higher-level routines.
*/
static int do_sysv_rename(struct inode * old_dir, struct dentry * old_dentry,
struct inode * new_dir, struct dentry * new_dentry)
{
struct inode * old_inode, * new_inode;
struct buffer_head * old_bh, * new_bh, * dir_bh;
struct sysv_dir_entry * old_de, * new_de;
int retval;
goto start_up;
try_again:
brelse(old_bh);
brelse(new_bh);
brelse(dir_bh);
current->counter = 0;
schedule();
start_up:
old_inode = new_inode = NULL;
old_bh = new_bh = dir_bh = NULL;
old_bh = sysv_find_entry(old_dir, old_dentry->d_name.name,
old_dentry->d_name.len, &old_de);
retval = -ENOENT;
if (!old_bh)
goto end_rename;
old_inode = old_dentry->d_inode; /* don't cross mnt-points */
retval = -EPERM;
new_inode = new_dentry->d_inode;
new_bh = sysv_find_entry(new_dir, new_dentry->d_name.name,
new_dentry->d_name.len, &new_de);
if (new_bh) {
if (!new_inode) {
brelse(new_bh);
new_bh = NULL;
}
}
if (new_inode == old_inode) {
retval = 0;
goto end_rename;
}
if (S_ISDIR(old_inode->i_mode)) {
retval = -EINVAL;
if (is_subdir(new_dentry, old_dentry))
goto end_rename;
if (new_inode) {
if (new_dentry->d_count > 1)
shrink_dcache_parent(new_dentry);
retval = -EBUSY;
if (new_dentry->d_count > 1)
goto end_rename;
retval = -ENOTEMPTY;
if (!empty_dir(new_inode))
goto end_rename;
}
retval = -EIO;
dir_bh = sysv_file_bread(old_inode, 0, 0);
if (!dir_bh)
goto end_rename;
if (PARENT_INO(dir_bh->b_data) != old_dir->i_ino)
goto end_rename;
retval = -EMLINK;
if (!new_inode && new_dir->i_nlink >= new_dir->i_sb->sv_link_max)
goto end_rename;
}
if (!new_bh) {
retval = sysv_add_entry(new_dir, new_dentry->d_name.name,
new_dentry->d_name.len, &new_bh, &new_de);
if (retval)
goto end_rename;
}
/* sanity checking before doing the rename - avoid races */
if (new_inode && (new_de->inode != new_inode->i_ino))
goto try_again;
if (new_de->inode && !new_inode)
goto try_again;
if (old_de->inode != old_inode->i_ino)
goto try_again;
/* ok, that's it */
old_de->inode = 0;
new_de->inode = old_inode->i_ino;
old_dir->i_ctime = old_dir->i_mtime = CURRENT_TIME;
mark_inode_dirty(old_dir);
new_dir->i_ctime = new_dir->i_mtime = CURRENT_TIME;
mark_inode_dirty(new_dir);
if (new_inode) {
new_inode->i_nlink--;
new_inode->i_ctime = CURRENT_TIME;
mark_inode_dirty(new_inode);
}
mark_buffer_dirty(old_bh, 1);
mark_buffer_dirty(new_bh, 1);
if (dir_bh) {
PARENT_INO(dir_bh->b_data) = new_dir->i_ino;
mark_buffer_dirty(dir_bh, 1);
old_dir->i_nlink--;
mark_inode_dirty(old_dir);
if (new_inode) {
new_inode->i_nlink--;
mark_inode_dirty(new_inode);
} else {
new_dir->i_nlink++;
mark_inode_dirty(new_dir);
}
}
d_move(old_dentry, new_dentry);
retval = 0;
end_rename:
brelse(dir_bh);
brelse(old_bh);
brelse(new_bh);
return retval;
}
/*
* This is called every time the dcache has a lookup hit,
* and we should check whether we can really trust that
* lookup.
*
* NOTE! The hit can be a negative hit too, don't assume
* we have an inode!
*
* If the parent directory is seen to have changed, we throw out the
* cached dentry and do a new lookup.
*/
static int nfs_lookup_revalidate(struct dentry * dentry, struct nameidata *nd)
{
struct inode *dir;
struct inode *inode;
struct dentry *parent;
int error;
struct nfs_fh fhandle;
struct nfs_fattr fattr;
unsigned long verifier;
int isopen = 0;
parent = dget_parent(dentry);
lock_kernel();
dir = parent->d_inode;
inode = dentry->d_inode;
if (nd && !(nd->flags & LOOKUP_CONTINUE) && (nd->flags & LOOKUP_OPEN))
isopen = 1;
if (!inode) {
if (nfs_neg_need_reval(dir, dentry, nd))
goto out_bad;
goto out_valid;
}
if (is_bad_inode(inode)) {
dfprintk(VFS, "nfs_lookup_validate: %s/%s has dud inode\n",
dentry->d_parent->d_name.name, dentry->d_name.name);
goto out_bad;
}
/* Revalidate parent directory attribute cache */
nfs_revalidate_inode(NFS_SERVER(dir), dir);
/* Force a full look up iff the parent directory has changed */
if (nfs_check_verifier(dir, dentry)) {
if (nfs_lookup_verify_inode(inode, isopen))
goto out_zap_parent;
goto out_valid;
}
/*
* Note: we're not holding inode->i_sem and so may be racing with
* operations that change the directory. We therefore save the
* change attribute *before* we do the RPC call.
*/
verifier = nfs_save_change_attribute(dir);
error = nfs_cached_lookup(dir, dentry, &fhandle, &fattr);
if (!error) {
if (memcmp(NFS_FH(inode), &fhandle, sizeof(struct nfs_fh))!= 0)
goto out_bad;
if (nfs_lookup_verify_inode(inode, isopen))
goto out_zap_parent;
goto out_valid_renew;
}
if (NFS_STALE(inode))
goto out_bad;
error = NFS_PROTO(dir)->lookup(dir, &dentry->d_name, &fhandle, &fattr);
if (error)
goto out_bad;
if (memcmp(NFS_FH(inode), &fhandle, sizeof(struct nfs_fh))!= 0)
goto out_bad;
if ((error = nfs_refresh_inode(inode, &fattr)) != 0)
goto out_bad;
out_valid_renew:
nfs_renew_times(dentry);
nfs_set_verifier(dentry, verifier);
out_valid:
unlock_kernel();
dput(parent);
return 1;
out_zap_parent:
nfs_zap_caches(dir);
out_bad:
NFS_CACHEINV(dir);
if (inode && S_ISDIR(inode->i_mode)) {
/* Purge readdir caches. */
nfs_zap_caches(inode);
/* If we have submounts, don't unhash ! */
if (have_submounts(dentry))
goto out_valid;
shrink_dcache_parent(dentry);
}
d_drop(dentry);
unlock_kernel();
dput(parent);
return 0;
}
/*
* RENAME
* FIXME: Some nfsds, like the Linux user space nfsd, may generate a
* different file handle for the same inode after a rename (e.g. when
* moving to a different directory). A fail-safe method to do so would
* be to look up old_dir/old_name, create a link to new_dir/new_name and
* rename the old file using the sillyrename stuff. This way, the original
* file in old_dir will go away when the last process iput()s the inode.
*
* FIXED.
*
* It actually works quite well. One needs to have the possibility for
* at least one ".nfs..." file in each directory the file ever gets
* moved or linked to which happens automagically with the new
* implementation that only depends on the dcache stuff instead of
* using the inode layer
*
* Unfortunately, things are a little more complicated than indicated
* above. For a cross-directory move, we want to make sure we can get
* rid of the old inode after the operation. This means there must be
* no pending writes (if it's a file), and the use count must be 1.
* If these conditions are met, we can drop the dentries before doing
* the rename.
*/
static int nfs_rename(struct inode *old_dir, struct dentry *old_dentry,
struct inode *new_dir, struct dentry *new_dentry)
{
struct inode *old_inode = old_dentry->d_inode;
struct inode *new_inode = new_dentry->d_inode;
struct dentry *dentry = NULL, *rehash = NULL;
int error = -EBUSY;
/*
* To prevent any new references to the target during the rename,
* we unhash the dentry and free the inode in advance.
*/
lock_kernel();
if (!d_unhashed(new_dentry)) {
d_drop(new_dentry);
rehash = new_dentry;
}
dfprintk(VFS, "NFS: rename(%s/%s -> %s/%s, ct=%d)\n",
old_dentry->d_parent->d_name.name, old_dentry->d_name.name,
new_dentry->d_parent->d_name.name, new_dentry->d_name.name,
atomic_read(&new_dentry->d_count));
/*
* First check whether the target is busy ... we can't
* safely do _any_ rename if the target is in use.
*
* For files, make a copy of the dentry and then do a
* silly-rename. If the silly-rename succeeds, the
* copied dentry is hashed and becomes the new target.
*/
if (!new_inode)
goto go_ahead;
if (S_ISDIR(new_inode->i_mode))
goto out;
else if (atomic_read(&new_dentry->d_count) > 1) {
int err;
/* copy the target dentry's name */
dentry = d_alloc(new_dentry->d_parent,
&new_dentry->d_name);
if (!dentry)
goto out;
/* silly-rename the existing target ... */
err = nfs_sillyrename(new_dir, new_dentry);
if (!err) {
new_dentry = rehash = dentry;
new_inode = NULL;
/* instantiate the replacement target */
d_instantiate(new_dentry, NULL);
}
/* dentry still busy? */
if (atomic_read(&new_dentry->d_count) > 1) {
#ifdef NFS_PARANOIA
printk("nfs_rename: target %s/%s busy, d_count=%d\n",
new_dentry->d_parent->d_name.name,
new_dentry->d_name.name,
atomic_read(&new_dentry->d_count));
#endif
goto out;
}
}
go_ahead:
/*
* ... prune child dentries and writebacks if needed.
*/
if (atomic_read(&old_dentry->d_count) > 1) {
nfs_wb_all(old_inode);
shrink_dcache_parent(old_dentry);
}
if (new_inode)
d_delete(new_dentry);
nfs_begin_data_update(old_dir);
nfs_begin_data_update(new_dir);
nfs_begin_data_update(old_inode);
error = NFS_PROTO(old_dir)->rename(old_dir, &old_dentry->d_name,
new_dir, &new_dentry->d_name);
nfs_end_data_update(old_inode);
nfs_end_data_update(new_dir);
nfs_end_data_update(old_dir);
out:
if (rehash)
d_rehash(rehash);
if (!error) {
if (!S_ISDIR(old_inode->i_mode))
d_move(old_dentry, new_dentry);
nfs_renew_times(new_dentry);
nfs_set_verifier(new_dentry, nfs_save_change_attribute(new_dir));
}
/* new dentry created? */
if (dentry)
dput(dentry);
unlock_kernel();
return error;
}
/*
* check that a dentry lookup hit has found a valid entry
* - NOTE! the hit can be a negative hit too, so we can't assume we have an inode
* (derived from nfs_lookup_revalidate)
*/
static int afs_d_revalidate(struct dentry *dentry, struct nameidata *nd)
{
struct afs_dir_lookup_cookie cookie;
struct dentry *parent;
struct inode *inode, *dir;
unsigned fpos;
int ret;
_enter("{sb=%p n=%s},",dentry->d_sb,dentry->d_name.name);
/* lock down the parent dentry so we can peer at it */
parent = dget_parent(dentry->d_parent);
dir = parent->d_inode;
inode = dentry->d_inode;
/* handle a negative inode */
if (!inode)
goto out_bad;
/* handle a bad inode */
if (is_bad_inode(inode)) {
printk("kAFS: afs_d_revalidate: %s/%s has bad inode\n",
dentry->d_parent->d_name.name,dentry->d_name.name);
goto out_bad;
}
/* force a full look up if the parent directory changed since last the server was consulted
* - otherwise this inode must still exist, even if the inode details themselves have
* changed
*/
if (AFS_FS_I(dir)->flags & AFS_VNODE_CHANGED)
afs_vnode_fetch_status(AFS_FS_I(dir));
if (AFS_FS_I(dir)->flags & AFS_VNODE_DELETED) {
_debug("%s: parent dir deleted",dentry->d_name.name);
goto out_bad;
}
if (AFS_FS_I(inode)->flags & AFS_VNODE_DELETED) {
_debug("%s: file already deleted",dentry->d_name.name);
goto out_bad;
}
if ((unsigned long)dentry->d_fsdata != (unsigned long)AFS_FS_I(dir)->status.version) {
_debug("%s: parent changed %lu -> %u",
dentry->d_name.name,
(unsigned long)dentry->d_fsdata,
(unsigned)AFS_FS_I(dir)->status.version);
/* search the directory for this vnode */
cookie.name = dentry->d_name.name;
cookie.nlen = dentry->d_name.len;
cookie.fid.vid = AFS_FS_I(inode)->volume->vid;
cookie.found = 0;
fpos = 0;
ret = afs_dir_iterate(dir,&fpos,&cookie,afs_dir_lookup_filldir);
if (ret<0) {
_debug("failed to iterate dir %s: %d",parent->d_name.name,ret);
goto out_bad;
}
if (!cookie.found) {
_debug("%s: dirent not found",dentry->d_name.name);
goto not_found;
}
/* if the vnode ID has changed, then the dirent points to a different file */
if (cookie.fid.vnode!=AFS_FS_I(inode)->fid.vnode) {
_debug("%s: dirent changed",dentry->d_name.name);
goto not_found;
}
/* if the vnode ID uniqifier has changed, then the file has been deleted */
if (cookie.fid.unique!=AFS_FS_I(inode)->fid.unique) {
_debug("%s: file deleted (uq %u -> %u I:%lu)",
dentry->d_name.name,
cookie.fid.unique,
AFS_FS_I(inode)->fid.unique,
inode->i_version);
spin_lock(&AFS_FS_I(inode)->lock);
AFS_FS_I(inode)->flags |= AFS_VNODE_DELETED;
spin_unlock(&AFS_FS_I(inode)->lock);
invalidate_remote_inode(inode);
goto out_bad;
}
dentry->d_fsdata = (void*) (unsigned long) AFS_FS_I(dir)->status.version;
}
out_valid:
dput(parent);
_leave(" = 1 [valid]");
return 1;
/* the dirent, if it exists, now points to a different vnode */
not_found:
dentry->d_flags |= DCACHE_NFSFS_RENAMED;
out_bad:
if (inode) {
/* don't unhash if we have submounts */
if (have_submounts(dentry))
goto out_valid;
}
shrink_dcache_parent(dentry);
_debug("dropping dentry %s/%s",dentry->d_parent->d_name.name,dentry->d_name.name);
d_drop(dentry);
dput(parent);
_leave(" = 0 [bad]");
return 0;
} /* end afs_d_revalidate() */