diff options
Diffstat (limited to 'fs/afs/proc.c')
| -rw-r--r-- | fs/afs/proc.c | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/fs/afs/proc.c b/fs/afs/proc.c index 15eab053af6d..12c88d8be3fe 100644 --- a/fs/afs/proc.c +++ b/fs/afs/proc.c @@ -206,7 +206,7 @@ static int afs_proc_rootcell_show(struct seq_file *m, void *v) net = afs_seq2net_single(m); down_read(&net->cells_lock); - cell = net->ws_cell; + cell = rcu_dereference_protected(net->ws_cell, lockdep_is_held(&net->cells_lock)); if (cell) seq_printf(m, "%s\n", cell->name); up_read(&net->cells_lock); @@ -240,7 +240,13 @@ static int afs_proc_rootcell_write(struct file *file, char *buf, size_t size) /* determine command to perform */ _debug("rootcell=%s", buf); - ret = afs_cell_init(net, buf); + ret = -EEXIST; + inode_lock(file_inode(file)); + if (!rcu_access_pointer(net->ws_cell)) + ret = afs_cell_init(net, buf); + else + printk("busy\n"); + inode_unlock(file_inode(file)); out: _leave(" = %d", ret); |