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afs: Fix cell proc list

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Access to the list of cells by /proc/net/afs/cells has a couple of
problems:

 (1) It should be checking against SEQ_START_TOKEN for the keying the
     header line.

 (2) It's only holding the RCU read lock, so it can't just walk over the
     list without following the proper RCU methods.

Fix these by using an hlist instead of an ordinary list and using the
appropriate accessor functions to follow it with RCU.

Since the code that adds a cell to the list must also necessarily change,
sort the list on insertion whilst we're at it.

Fixes: 989782dcdc ("afs: Overhaul cell database management")
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
David Howells 2018-10-11 22:45:49 +01:00 committed by Greg Kroah-Hartman
parent 4ea07abbfb
commit 6b3944e42e
5 changed files with 22 additions and 10 deletions
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17
fs/afs/cell.c
View file

@ -514,6 +514,8 @@ static int afs_alloc_anon_key(struct afs_cell *cell)
*/
static int afs_activate_cell(struct afs_net *net, struct afs_cell *cell)
{
struct hlist_node **p;
struct afs_cell *pcell;
int ret;
if (!cell->anonymous_key) {
@ -534,7 +536,18 @@ static int afs_activate_cell(struct afs_net *net, struct afs_cell *cell)
return ret;
mutex_lock(&net->proc_cells_lock);
list_add_tail(&cell->proc_link, &net->proc_cells);
for (p = &net->proc_cells.first; *p; p = &(*p)->next) {
pcell = hlist_entry(*p, struct afs_cell, proc_link);
if (strcmp(cell->name, pcell->name) < 0)
break;
}
cell->proc_link.pprev = p;
cell->proc_link.next = *p;
rcu_assign_pointer(*p, &cell->proc_link.next);
if (cell->proc_link.next)
cell->proc_link.next->pprev = &cell->proc_link.next;
afs_dynroot_mkdir(net, cell);
mutex_unlock(&net->proc_cells_lock);
return 0;
@ -550,7 +563,7 @@ static void afs_deactivate_cell(struct afs_net *net, struct afs_cell *cell)
afs_proc_cell_remove(cell);
mutex_lock(&net->proc_cells_lock);
list_del_init(&cell->proc_link);
hlist_del_rcu(&cell->proc_link);
afs_dynroot_rmdir(net, cell);
mutex_unlock(&net->proc_cells_lock);

2
fs/afs/dynroot.c
View file

@ -265,7 +265,7 @@ int afs_dynroot_populate(struct super_block *sb)
return -ERESTARTSYS;
net->dynroot_sb = sb;
list_for_each_entry(cell, &net->proc_cells, proc_link) {
hlist_for_each_entry(cell, &net->proc_cells, proc_link) {
ret = afs_dynroot_mkdir(net, cell);
if (ret < 0)
goto error;

4
fs/afs/internal.h
View file

@ -242,7 +242,7 @@ struct afs_net {
seqlock_t cells_lock;
struct mutex proc_cells_lock;
struct list_head proc_cells;
struct hlist_head proc_cells;
/* Known servers. Theoretically each fileserver can only be in one
* cell, but in practice, people create aliases and subsets and there's
@ -320,7 +320,7 @@ struct afs_cell {
struct afs_net *net;
struct key *anonymous_key; /* anonymous user key for this cell */
struct work_struct manager; /* Manager for init/deinit/dns */
struct list_head proc_link; /* /proc cell list link */
struct hlist_node proc_link; /* /proc cell list link */
#ifdef CONFIG_AFS_FSCACHE
struct fscache_cookie *cache; /* caching cookie */
#endif

2
fs/afs/main.c
View file

@ -87,7 +87,7 @@ static int __net_init afs_net_init(struct net *net_ns)
timer_setup(&net->cells_timer, afs_cells_timer, 0);
mutex_init(&net->proc_cells_lock);
INIT_LIST_HEAD(&net->proc_cells);
INIT_HLIST_HEAD(&net->proc_cells);
seqlock_init(&net->fs_lock);
net->fs_servers = RB_ROOT;

7
fs/afs/proc.c
View file

@ -33,9 +33,8 @@ static inline struct afs_net *afs_seq2net_single(struct seq_file *m)
static int afs_proc_cells_show(struct seq_file *m, void *v)
{
struct afs_cell *cell = list_entry(v, struct afs_cell, proc_link);
struct afs_net *net = afs_seq2net(m);
if (v == &net->proc_cells) {
if (v == SEQ_START_TOKEN) {
/* display header on line 1 */
seq_puts(m, "USE NAME\n");
return 0;
@ -50,12 +49,12 @@ static void *afs_proc_cells_start(struct seq_file *m, loff_t *_pos)
__acquires(rcu)
{
rcu_read_lock();
return seq_list_start_head(&afs_seq2net(m)->proc_cells, *_pos);
return seq_hlist_start_head_rcu(&afs_seq2net(m)->proc_cells, *_pos);
}
static void *afs_proc_cells_next(struct seq_file *m, void *v, loff_t *pos)
{
return seq_list_next(v, &afs_seq2net(m)->proc_cells, pos);
return seq_hlist_next_rcu(v, &afs_seq2net(m)->proc_cells, pos);
}
static void afs_proc_cells_stop(struct seq_file *m, void *v)