^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-or-later
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /* Filesystem index definition
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) * Copyright (C) 2004-2007 Red Hat, Inc. All Rights Reserved.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Written by David Howells (dhowells@redhat.com)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) #define FSCACHE_DEBUG_LEVEL CACHE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include "internal.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) static
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) enum fscache_checkaux fscache_fsdef_netfs_check_aux(void *cookie_netfs_data,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) const void *data,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) uint16_t datalen,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) loff_t object_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) * The root index is owned by FS-Cache itself.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) * When a netfs requests caching facilities, FS-Cache will, if one doesn't
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) * already exist, create an entry in the root index with the key being the name
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) * of the netfs ("AFS" for example), and the auxiliary data holding the index
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) * structure version supplied by the netfs:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) * FSDEF
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) * |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) * +-----------+
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) * | |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) * NFS AFS
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) * [v=1] [v=1]
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) * If an entry with the appropriate name does already exist, the version is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) * compared. If the version is different, the entire subtree from that entry
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) * will be discarded and a new entry created.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) * The new entry will be an index, and a cookie referring to it will be passed
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) * to the netfs. This is then the root handle by which the netfs accesses the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) * cache. It can create whatever objects it likes in that index, including
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) * further indices.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) static struct fscache_cookie_def fscache_fsdef_index_def = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) .name = ".FS-Cache",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) .type = FSCACHE_COOKIE_TYPE_INDEX,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) struct fscache_cookie fscache_fsdef_index = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) .usage = ATOMIC_INIT(1),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) .n_active = ATOMIC_INIT(1),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) .lock = __SPIN_LOCK_UNLOCKED(fscache_fsdef_index.lock),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) .backing_objects = HLIST_HEAD_INIT,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) .def = &fscache_fsdef_index_def,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) .flags = 1 << FSCACHE_COOKIE_ENABLED,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) .type = FSCACHE_COOKIE_TYPE_INDEX,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) EXPORT_SYMBOL(fscache_fsdef_index);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) * Definition of an entry in the root index. Each entry is an index, keyed to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) * a specific netfs and only applicable to a particular version of the index
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) * structure used by that netfs.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) struct fscache_cookie_def fscache_fsdef_netfs_def = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) .name = "FSDEF.netfs",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) .type = FSCACHE_COOKIE_TYPE_INDEX,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) .check_aux = fscache_fsdef_netfs_check_aux,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) * check that the index structure version number stored in the auxiliary data
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) * matches the one the netfs gave us
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) static enum fscache_checkaux fscache_fsdef_netfs_check_aux(
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) void *cookie_netfs_data,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) const void *data,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) uint16_t datalen,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) loff_t object_size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) struct fscache_netfs *netfs = cookie_netfs_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) uint32_t version;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) _enter("{%s},,%hu", netfs->name, datalen);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) if (datalen != sizeof(version)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) _leave(" = OBSOLETE [dl=%d v=%zu]", datalen, sizeof(version));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) return FSCACHE_CHECKAUX_OBSOLETE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) memcpy(&version, data, sizeof(version));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) if (version != netfs->version) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) _leave(" = OBSOLETE [ver=%x net=%x]", version, netfs->version);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) return FSCACHE_CHECKAUX_OBSOLETE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) _leave(" = OKAY");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) return FSCACHE_CHECKAUX_OKAY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) }
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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