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authorDavid Howells <dhowells@redhat.com>2018-02-06 06:26:30 +0000
committerDavid Howells <dhowells@redhat.com>2018-02-06 14:43:37 +0000
commit4d673da14533b32fe8d3125b5b7be4fea14e39a8 (patch)
treed0780b5603a48614696e7e9afebe5b61552c6cd1 /fs/afs/mntpt.c
parent16280a15be751b9994e94c5dc944e93fa4293199 (diff)
downloadlinux-4d673da14533b32fe8d3125b5b7be4fea14e39a8.tar.bz2
afs: Support the AFS dynamic root
Support the AFS dynamic root which is a pseudo-volume that doesn't connect to any server resource, but rather is just a root directory that dynamically creates mountpoint directories where the name of such a directory is the name of the cell. Such a mount can be created thus: mount -t afs none /afs -o dyn Dynamic root superblocks aren't shared except by bind mounts and propagation. Cell root volumes can then be mounted by referring to them by name, e.g.: ls /afs/grand.central.org/ ls /afs/.grand.central.org/ The kernel will upcall to consult the DNS if the address wasn't supplied directly. Signed-off-by: David Howells <dhowells@redhat.com>
Diffstat (limited to 'fs/afs/mntpt.c')
-rw-r--r--fs/afs/mntpt.c20
1 files changed, 11 insertions, 9 deletions
diff --git a/fs/afs/mntpt.c b/fs/afs/mntpt.c
index 690fea9d84c3..99fd13500a97 100644
--- a/fs/afs/mntpt.c
+++ b/fs/afs/mntpt.c
@@ -72,7 +72,7 @@ static int afs_mntpt_open(struct inode *inode, struct file *file)
*/
static struct vfsmount *afs_mntpt_do_automount(struct dentry *mntpt)
{
- struct afs_super_info *super;
+ struct afs_super_info *as;
struct vfsmount *mnt;
struct afs_vnode *vnode;
struct page *page;
@@ -104,13 +104,13 @@ static struct vfsmount *afs_mntpt_do_automount(struct dentry *mntpt)
goto error_no_page;
if (mntpt->d_name.name[0] == '.') {
- devname[0] = '#';
- memcpy(devname + 1, mntpt->d_name.name, size - 1);
+ devname[0] = '%';
+ memcpy(devname + 1, mntpt->d_name.name + 1, size - 1);
memcpy(devname + size, afs_root_cell,
sizeof(afs_root_cell));
rwpath = true;
} else {
- devname[0] = '%';
+ devname[0] = '#';
memcpy(devname + 1, mntpt->d_name.name, size);
memcpy(devname + size + 1, afs_root_cell,
sizeof(afs_root_cell));
@@ -142,11 +142,13 @@ static struct vfsmount *afs_mntpt_do_automount(struct dentry *mntpt)
}
/* work out what options we want */
- super = AFS_FS_S(mntpt->d_sb);
- memcpy(options, "cell=", 5);
- strcpy(options + 5, super->volume->cell->name);
- if (super->volume->type == AFSVL_RWVOL || rwpath)
- strcat(options, ",rwpath");
+ as = AFS_FS_S(mntpt->d_sb);
+ if (as->cell) {
+ memcpy(options, "cell=", 5);
+ strcpy(options + 5, as->cell->name);
+ if ((as->volume && as->volume->type == AFSVL_RWVOL) || rwpath)
+ strcat(options, ",rwpath");
+ }
/* try and do the mount */
_debug("--- attempting mount %s -o %s ---", devname, options);