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author | David Howells <dhowells@redhat.com> | 2018-02-06 06:26:30 +0000 |
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committer | David Howells <dhowells@redhat.com> | 2018-02-06 14:43:37 +0000 |
commit | 4d673da14533b32fe8d3125b5b7be4fea14e39a8 (patch) | |
tree | d0780b5603a48614696e7e9afebe5b61552c6cd1 /fs/afs/mntpt.c | |
parent | 16280a15be751b9994e94c5dc944e93fa4293199 (diff) | |
download | linux-stable-4d673da14533b32fe8d3125b5b7be4fea14e39a8.tar.gz linux-stable-4d673da14533b32fe8d3125b5b7be4fea14e39a8.tar.bz2 linux-stable-4d673da14533b32fe8d3125b5b7be4fea14e39a8.zip |
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.c | 20 |
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); |