summaryrefslogtreecommitdiffstats
path: root/fs/afs/proc.c
diff options
context:
space:
mode:
authorDavid Howells <dhowells@redhat.com>2018-04-06 14:17:23 +0100
committerDavid Howells <dhowells@redhat.com>2018-04-09 21:18:58 +0100
commit37ab636880cbc95ba87a5790bee23a1c813089c6 (patch)
tree931c5387eeefbab0b326b62532644dd6a32c78f0 /fs/afs/proc.c
parent6f8880d8e68155726a2a22e8787cfebf1ffcab08 (diff)
downloadlinux-37ab636880cbc95ba87a5790bee23a1c813089c6.tar.bz2
afs: Implement @cell substitution handling
Implement @cell substitution handling such that if @cell is seen as a name in a dynamic root mount, then the name of the root cell for that network namespace will be substituted for @cell during lookup. The substitution of @cell for the current net namespace is set by writing the cell name to /proc/fs/afs/rootcell. The value can be obtained by reading the file. For example: # mount -t afs none /kafs -o dyn # echo grand.central.org >/proc/fs/afs/rootcell # ls /kafs/@cell archive/ cvs/ doc/ local/ project/ service/ software/ user/ www/ # cat /proc/fs/afs/rootcell grand.central.org Signed-off-by: David Howells <dhowells@redhat.com>
Diffstat (limited to 'fs/afs/proc.c')
-rw-r--r--fs/afs/proc.c35
1 files changed, 34 insertions, 1 deletions
diff --git a/fs/afs/proc.c b/fs/afs/proc.c
index 15650cd59404..76f6df32cde0 100644
--- a/fs/afs/proc.c
+++ b/fs/afs/proc.c
@@ -334,7 +334,40 @@ inval:
static ssize_t afs_proc_rootcell_read(struct file *file, char __user *buf,
size_t size, loff_t *_pos)
{
- return 0;
+ struct afs_cell *cell;
+ struct afs_net *net = afs_proc2net(file);
+ unsigned int seq = 0;
+ char name[AFS_MAXCELLNAME + 1];
+ int len;
+
+ if (*_pos > 0)
+ return 0;
+ if (!net->ws_cell)
+ return 0;
+
+ rcu_read_lock();
+ do {
+ read_seqbegin_or_lock(&net->cells_lock, &seq);
+ len = 0;
+ cell = rcu_dereference_raw(net->ws_cell);
+ if (cell) {
+ len = cell->name_len;
+ memcpy(name, cell->name, len);
+ }
+ } while (need_seqretry(&net->cells_lock, seq));
+ done_seqretry(&net->cells_lock, seq);
+ rcu_read_unlock();
+
+ if (!len)
+ return 0;
+
+ name[len++] = '\n';
+ if (len > size)
+ len = size;
+ if (copy_to_user(buf, name, len) != 0)
+ return -EFAULT;
+ *_pos = 1;
+ return len;
}
/*