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afs: Push the net ns pointer to more places

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Push the network namespace pointer to more places in AFS, including the
afs_server structure (which doesn't hold a ref on the netns).

In particular, afs_put_cell() now takes requires a net ns parameter so that
it can safely alter the netns after decrementing the cell usage count - the
cell will be deallocated by a background thread after being cached for a
period, which means that it's not safe to access it after reducing its
usage count.

Signed-off-by: David Howells <dhowells@redhat.com>
This commit is contained in:
David Howells
2017-11-02 15:27:46 +00:00
parent 49566f6f06
commit 9ed900b116
11 changed files with 56 additions and 56 deletions
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7
fs/afs/internal.h
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@@ -335,6 +335,7 @@ struct afs_server {
atomic_t usage;
time64_t time_of_death; /* time at which put reduced usage to 0 */
struct in_addr addr; /* server address */
struct afs_net *net; /* Network namespace in which the server resides */
struct afs_cell *cell; /* cell in which server resides */
struct list_head link; /* link in cell's server list */
struct list_head grave; /* link in master graveyard list */
@@ -513,7 +514,7 @@ extern int afs_cell_init(struct afs_net *, char *);
extern struct afs_cell *afs_cell_create(struct afs_net *, const char *, unsigned, char *, bool);
extern struct afs_cell *afs_cell_lookup(struct afs_net *, const char *, unsigned, bool);
extern struct afs_cell *afs_grab_cell(struct afs_cell *);
extern void afs_put_cell(struct afs_cell *);
extern void afs_put_cell(struct afs_net *, struct afs_cell *);
extern void __net_exit afs_cell_purge(struct afs_net *);
/*
@@ -713,7 +714,7 @@ extern struct afs_server *afs_lookup_server(struct afs_cell *,
const struct in_addr *);
extern struct afs_server *afs_find_server(struct afs_net *,
const struct sockaddr_rxrpc *);
extern void afs_put_server(struct afs_server *);
extern void afs_put_server(struct afs_net *, struct afs_server *);
extern void afs_reap_server(struct work_struct *);
extern void __net_exit afs_purge_servers(struct afs_net *);
@@ -802,7 +803,7 @@ static inline struct afs_volume *afs_get_volume(struct afs_volume *volume)
return volume;
}
extern void afs_put_volume(struct afs_net *, struct afs_volume *);
extern void afs_put_volume(struct afs_cell *, struct afs_volume *);
extern struct afs_volume *afs_volume_lookup(struct afs_mount_params *);
extern struct afs_server *afs_volume_pick_fileserver(struct afs_vnode *);
extern int afs_volume_release_fileserver(struct afs_vnode *,