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authorDavid Howells <dhowells@redhat.com>2018-06-15 17:19:22 +0300
committerDavid Howells <dhowells@redhat.com>2018-06-15 17:27:09 +0300
commit0da0b7fd73e4f20e1a987dfade0b36bb4813cf10 (patch)
treee0b6e920d546fc0dbf0d813418ad3e4b0d61eabe /fs/afs/cell.c
parentc88d5a7fff2ef9aeed8aebb06f59d565693d0634 (diff)
downloadlinux-0da0b7fd73e4f20e1a987dfade0b36bb4813cf10.tar.xz
afs: Display manually added cells in dynamic root mount
Alter the dynroot mount so that cells created by manipulation of /proc/fs/afs/cells and /proc/fs/afs/rootcell and by specification of a root cell as a module parameter will cause directories for those cells to be created in the dynamic root superblock for the network namespace[*]. To this end: (1) Only one dynamic root superblock is now created per network namespace and this is shared between all attempts to mount it. This makes it easier to find the superblock to modify. (2) When a dynamic root superblock is created, the list of cells is walked and directories created for each cell already defined. (3) When a new cell is added, if a dynamic root superblock exists, a directory is created for it. (4) When a cell is destroyed, the directory is removed. (5) These directories are created by calling lookup_one_len() on the root dir which automatically creates them if they don't exist. [*] Inasmuch as network namespaces are currently supported here. Signed-off-by: David Howells <dhowells@redhat.com>
Diffstat (limited to 'fs/afs/cell.c')
-rw-r--r--fs/afs/cell.c12
1 files changed, 8 insertions, 4 deletions
diff --git a/fs/afs/cell.c b/fs/afs/cell.c
index bb92b54d2a4a..f3d0bef16d78 100644
--- a/fs/afs/cell.c
+++ b/fs/afs/cell.c
@@ -15,6 +15,7 @@
#include <linux/dns_resolver.h>
#include <linux/sched.h>
#include <linux/inet.h>
+#include <linux/namei.h>
#include <keys/rxrpc-type.h>
#include "internal.h"
@@ -531,9 +532,11 @@ static int afs_activate_cell(struct afs_net *net, struct afs_cell *cell)
ret = afs_proc_cell_setup(cell);
if (ret < 0)
return ret;
- spin_lock(&net->proc_cells_lock);
+
+ mutex_lock(&net->proc_cells_lock);
list_add_tail(&cell->proc_link, &net->proc_cells);
- spin_unlock(&net->proc_cells_lock);
+ afs_dynroot_mkdir(net, cell);
+ mutex_unlock(&net->proc_cells_lock);
return 0;
}
@@ -546,9 +549,10 @@ static void afs_deactivate_cell(struct afs_net *net, struct afs_cell *cell)
afs_proc_cell_remove(cell);
- spin_lock(&net->proc_cells_lock);
+ mutex_lock(&net->proc_cells_lock);
list_del_init(&cell->proc_link);
- spin_unlock(&net->proc_cells_lock);
+ afs_dynroot_rmdir(net, cell);
+ mutex_unlock(&net->proc_cells_lock);
#ifdef CONFIG_AFS_FSCACHE
fscache_relinquish_cookie(cell->cache, NULL, false);