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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-17 02:20:36 +0400
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-17 02:20:36 +0400
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /fs/afs/volume.h
downloadlinux-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.xz
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'fs/afs/volume.h')
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diff --git a/fs/afs/volume.h b/fs/afs/volume.h
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+/* volume.h: AFS volume management
+ *
+ * Copyright (C) 2002 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#ifndef _LINUX_AFS_VOLUME_H
+#define _LINUX_AFS_VOLUME_H
+
+#include "types.h"
+#include "fsclient.h"
+#include "kafstimod.h"
+#include "kafsasyncd.h"
+#include "cache.h"
+
+#define __packed __attribute__((packed))
+
+typedef enum {
+ AFS_VLUPD_SLEEP, /* sleeping waiting for update timer to fire */
+ AFS_VLUPD_PENDING, /* on pending queue */
+ AFS_VLUPD_INPROGRESS, /* op in progress */
+ AFS_VLUPD_BUSYSLEEP, /* sleeping because server returned EBUSY */
+
+} __attribute__((packed)) afs_vlocation_upd_t;
+
+/*****************************************************************************/
+/*
+ * entry in the cached volume location catalogue
+ */
+struct afs_cache_vlocation
+{
+ uint8_t name[64]; /* volume name (lowercase, padded with NULs) */
+ uint8_t nservers; /* number of entries used in servers[] */
+ uint8_t vidmask; /* voltype mask for vid[] */
+ uint8_t srvtmask[8]; /* voltype masks for servers[] */
+#define AFS_VOL_VTM_RW 0x01 /* R/W version of the volume is available (on this server) */
+#define AFS_VOL_VTM_RO 0x02 /* R/O version of the volume is available (on this server) */
+#define AFS_VOL_VTM_BAK 0x04 /* backup version of the volume is available (on this server) */
+
+ afs_volid_t vid[3]; /* volume IDs for R/W, R/O and Bak volumes */
+ struct in_addr servers[8]; /* fileserver addresses */
+ time_t rtime; /* last retrieval time */
+};
+
+#ifdef AFS_CACHING_SUPPORT
+extern struct cachefs_index_def afs_vlocation_cache_index_def;
+#endif
+
+/*****************************************************************************/
+/*
+ * volume -> vnode hash table entry
+ */
+struct afs_cache_vhash
+{
+ afs_voltype_t vtype; /* which volume variation */
+ uint8_t hash_bucket; /* which hash bucket this represents */
+} __attribute__((packed));
+
+#ifdef AFS_CACHING_SUPPORT
+extern struct cachefs_index_def afs_volume_cache_index_def;
+#endif
+
+/*****************************************************************************/
+/*
+ * AFS volume location record
+ */
+struct afs_vlocation
+{
+ atomic_t usage;
+ struct list_head link; /* link in cell volume location list */
+ struct afs_timer timeout; /* decaching timer */
+ struct afs_cell *cell; /* cell to which volume belongs */
+#ifdef AFS_CACHING_SUPPORT
+ struct cachefs_cookie *cache; /* caching cookie */
+#endif
+ struct afs_cache_vlocation vldb; /* volume information DB record */
+ struct afs_volume *vols[3]; /* volume access record pointer (index by type) */
+ rwlock_t lock; /* access lock */
+ unsigned long read_jif; /* time at which last read from vlserver */
+ struct afs_timer upd_timer; /* update timer */
+ struct afs_async_op upd_op; /* update operation */
+ afs_vlocation_upd_t upd_state; /* update state */
+ unsigned short upd_first_svix; /* first server index during update */
+ unsigned short upd_curr_svix; /* current server index during update */
+ unsigned short upd_rej_cnt; /* ENOMEDIUM count during update */
+ unsigned short upd_busy_cnt; /* EBUSY count during update */
+ unsigned short valid; /* T if valid */
+};
+
+extern int afs_vlocation_lookup(struct afs_cell *cell,
+ const char *name,
+ unsigned namesz,
+ struct afs_vlocation **_vlocation);
+
+#define afs_get_vlocation(V) do { atomic_inc(&(V)->usage); } while(0)
+
+extern void afs_put_vlocation(struct afs_vlocation *vlocation);
+extern void afs_vlocation_do_timeout(struct afs_vlocation *vlocation);
+
+/*****************************************************************************/
+/*
+ * AFS volume access record
+ */
+struct afs_volume
+{
+ atomic_t usage;
+ struct afs_cell *cell; /* cell to which belongs (unrefd ptr) */
+ struct afs_vlocation *vlocation; /* volume location */
+#ifdef AFS_CACHING_SUPPORT
+ struct cachefs_cookie *cache; /* caching cookie */
+#endif
+ afs_volid_t vid; /* volume ID */
+ afs_voltype_t __packed type; /* type of volume */
+ char type_force; /* force volume type (suppress R/O -> R/W) */
+ unsigned short nservers; /* number of server slots filled */
+ unsigned short rjservers; /* number of servers discarded due to -ENOMEDIUM */
+ struct afs_server *servers[8]; /* servers on which volume resides (ordered) */
+ struct rw_semaphore server_sem; /* lock for accessing current server */
+};
+
+extern int afs_volume_lookup(const char *name,
+ struct afs_cell *cell,
+ int rwpath,
+ struct afs_volume **_volume);
+
+#define afs_get_volume(V) do { atomic_inc(&(V)->usage); } while(0)
+
+extern void afs_put_volume(struct afs_volume *volume);
+
+extern int afs_volume_pick_fileserver(struct afs_volume *volume,
+ struct afs_server **_server);
+
+extern int afs_volume_release_fileserver(struct afs_volume *volume,
+ struct afs_server *server,
+ int result);
+
+#endif /* _LINUX_AFS_VOLUME_H */