afs: Fix use-after-free due to get/remove race in volume tree

[platform/kernel/linux-rpi.git] / fs / afs / internal.h

diff --git a/fs/afs/internal.h b/fs/afs/internal.h
index 5041eae..c4bf843 100644 (file)
--- a/fs/afs/internal.h
+++ b/fs/afs/internal.h
@@ -586,6 +586,7 @@ struct afs_volume {
 #define AFS_VOLUME_OFFLINE     4       /* - T if volume offline notice given */
 #define AFS_VOLUME_BUSY                5       /* - T if volume busy notice given */
 #define AFS_VOLUME_MAYBE_NO_IBULK 6    /* - T if some servers don't have InlineBulkStatus */
+#define AFS_VOLUME_RM_TREE     7       /* - Set if volume removed from cell->volumes */
 #ifdef CONFIG_AFS_FSCACHE
        struct fscache_volume   *cache;         /* Caching cookie */
 #endif
@@ -1513,6 +1514,7 @@ extern struct afs_vlserver_list *afs_extract_vlserver_list(struct afs_cell *,
 extern struct afs_volume *afs_create_volume(struct afs_fs_context *);
 extern int afs_activate_volume(struct afs_volume *);
 extern void afs_deactivate_volume(struct afs_volume *);
+bool afs_try_get_volume(struct afs_volume *volume, enum afs_volume_trace reason);
 extern struct afs_volume *afs_get_volume(struct afs_volume *, enum afs_volume_trace);
 extern void afs_put_volume(struct afs_net *, struct afs_volume *, enum afs_volume_trace);
 extern int afs_check_volume_status(struct afs_volume *, struct afs_operation *);