[AFS]: Add "directory write" support.

Add support for the create, link, symlink, unlink, mkdir, rmdir and
rename VFS operations to the in-kernel AFS filesystem.

Also:

 (1) Fix dentry and inode revalidation.  d_revalidate should only look at
     state of the dentry.  Revalidation of the contents of an inode pointed to
     by a dentry is now separate.

 (2) Fix afs_lookup() to hash negative dentries as well as positive ones.

Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 46 insertions, 8 deletions

diff --git a/fs/afs/internal.h b/fs/afs/internal.h
index 6120d4bd19e..73bfa0b2d99 100644
--- a/fs/afs/internal.h
+++ b/fs/afs/internal.h
@@ -80,6 +80,7 @@ struct afs_call {
         void                    *reply;         /* reply buffer (first part) */
         void                    *reply2;        /* reply buffer (second part) */
         void                    *reply3;        /* reply buffer (third part) */
+        void                    *reply4;        /* reply buffer (fourth part) */
         enum {                                  /* call state */
                 AFS_CALL_REQUESTING,    /* request is being sent for outgoing call */
                 AFS_CALL_AWAIT_REPLY,   /* awaiting reply to outgoing call */
@@ -300,19 +301,18 @@ struct afs_vnode {
 #endif
         struct afs_permits      *permits;       /* cache of permits so far obtained */
         struct mutex            permits_lock;   /* lock for altering permits list */
+        struct mutex            validate_lock;  /* lock for validating this vnode */
         wait_queue_head_t       update_waitq;   /* status fetch waitqueue */
-        unsigned                update_cnt;     /* number of outstanding ops that will update the
+        int                     update_cnt;     /* number of outstanding ops that will update the
                                                  * status */
         spinlock_t              lock;           /* waitqueue/flags lock */
         unsigned long           flags;
 #define AFS_VNODE_CB_BROKEN     0               /* set if vnode's callback was broken */
-#define AFS_VNODE_CHANGED       1               /* set if vnode's metadata changed */
+#define AFS_VNODE_UNSET         1               /* set if vnode attributes not yet set */
 #define AFS_VNODE_MODIFIED      2               /* set if vnode's data modified */
 #define AFS_VNODE_ZAP_DATA      3               /* set if vnode's data should be invalidated */
 #define AFS_VNODE_DELETED       4               /* set if vnode deleted on server */
 #define AFS_VNODE_MOUNTPOINT    5               /* set if vnode is a mountpoint symlink */
-#define AFS_VNODE_DIR_CHANGED   6               /* set if vnode's parent dir metadata changed */
-#define AFS_VNODE_DIR_MODIFIED  7               /* set if vnode's parent dir data modified */
 
         long                    acl_order;      /* ACL check count (callback break count) */
 
@@ -320,7 +320,6 @@ struct afs_vnode {
         struct rb_node          server_rb;      /* link in server->fs_vnodes */
         struct rb_node          cb_promise;     /* link in server->cb_promises */
         struct work_struct      cb_broken_work; /* work to be done on callback break */
-        struct mutex            cb_broken_lock; /* lock against multiple attempts to fix break */
         time_t                  cb_expires;     /* time at which callback expires */
         time_t                  cb_expires_at;  /* time used to order cb_promise */
         unsigned                cb_version;     /* callback version */
@@ -388,6 +387,7 @@ extern void afs_init_callback_state(struct afs_server *);
 extern void afs_broken_callback_work(struct work_struct *);
 extern void afs_break_callbacks(struct afs_server *, size_t,
                                 struct afs_callback[]);
+extern void afs_discard_callback_on_delete(struct afs_vnode *);
 extern void afs_give_up_callback(struct afs_vnode *);
 extern void afs_dispatch_give_up_callbacks(struct work_struct *);
 extern void afs_flush_callback_breaks(struct afs_server *);
@@ -448,14 +448,34 @@ extern int afs_fs_give_up_callbacks(struct afs_server *,
                                     const struct afs_wait_mode *);
 extern int afs_fs_fetch_data(struct afs_server *, struct key *,
                              struct afs_vnode *, off_t, size_t, struct page *,
-                             struct afs_volsync *,
                              const struct afs_wait_mode *);
+extern int afs_fs_create(struct afs_server *, struct key *,
+                         struct afs_vnode *, const char *, umode_t,
+                         struct afs_fid *, struct afs_file_status *,
+                         struct afs_callback *,
+                         const struct afs_wait_mode *);
+extern int afs_fs_remove(struct afs_server *, struct key *,
+                         struct afs_vnode *, const char *, bool,
+                         const struct afs_wait_mode *);
+extern int afs_fs_link(struct afs_server *, struct key *, struct afs_vnode *,
+                       struct afs_vnode *, const char *,
+                       const struct afs_wait_mode *);
+extern int afs_fs_symlink(struct afs_server *, struct key *,
+                          struct afs_vnode *, const char *, const char *,
+                          struct afs_fid *, struct afs_file_status *,
+                          const struct afs_wait_mode *);
+extern int afs_fs_rename(struct afs_server *, struct key *,
+                         struct afs_vnode *, const char *,
+                         struct afs_vnode *, const char *,
+                         const struct afs_wait_mode *);
 
 /*
  * inode.c
  */
 extern struct inode *afs_iget(struct super_block *, struct key *,
-                              struct afs_fid *);
+                              struct afs_fid *, struct afs_file_status *,
+                              struct afs_callback *);
+extern int afs_validate(struct afs_vnode *, struct key *);
 extern int afs_inode_getattr(struct vfsmount *, struct dentry *,
                              struct kstat *);
 extern void afs_zap_permits(struct rcu_head *);
@@ -522,7 +542,11 @@ extern int afs_permission(struct inode *, int, struct nameidata *);
  */
 extern spinlock_t afs_server_peer_lock;
 
-#define afs_get_server(S) do { atomic_inc(&(S)->usage); } while(0)
+#define afs_get_server(S)                                       \
+do {                                                            \
+        _debug("GET SERVER %d", atomic_read(&(S)->usage));      \
+        atomic_inc(&(S)->usage);                                \
+} while(0)
 
 extern struct afs_server *afs_lookup_server(struct afs_cell *,
                                             const struct in_addr *);
@@ -588,10 +612,24 @@ static inline struct inode *AFS_VNODE_TO_I(struct afs_vnode *vnode)
         return &vnode->vfs_inode;
 }
 
+extern void afs_vnode_finalise_status_update(struct afs_vnode *,
+                                             struct afs_server *);
 extern int afs_vnode_fetch_status(struct afs_vnode *, struct afs_vnode *,
                                   struct key *);
 extern int afs_vnode_fetch_data(struct afs_vnode *, struct key *,
                                 off_t, size_t, struct page *);
+extern int afs_vnode_create(struct afs_vnode *, struct key *, const char *,
+                            umode_t, struct afs_fid *, struct afs_file_status *,
+                            struct afs_callback *, struct afs_server **);
+extern int afs_vnode_remove(struct afs_vnode *, struct key *, const char *,
+                            bool);
+extern int afs_vnode_link(struct afs_vnode *, struct afs_vnode *, struct key *,
+                          const char *);
+extern int afs_vnode_symlink(struct afs_vnode *, struct key *, const char *,
+                             const char *, struct afs_fid *,
+                             struct afs_file_status *, struct afs_server **);
+extern int afs_vnode_rename(struct afs_vnode *, struct afs_vnode *,
+                            struct key *, const char *, const char *);
 
 /*
  * volume.c