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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/cell.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/cell.c')
-rw-r--r--fs/afs/cell.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/fs/afs/cell.c b/fs/afs/cell.c
index 721425b98b31..fdf4c36cff79 100644
--- a/fs/afs/cell.c
+++ b/fs/afs/cell.c
@@ -130,6 +130,8 @@ static struct afs_cell *afs_alloc_cell(struct afs_net *net,
_leave(" = -ENAMETOOLONG");
return ERR_PTR(-ENAMETOOLONG);
}
+ if (namelen == 5 && memcmp(name, "@cell", 5) == 0)
+ return ERR_PTR(-EINVAL);
_enter("%*.*s,%s", namelen, namelen, name, vllist);