-/*
- * Copyright (c) 2002 Red Hat, Inc. All rights reserved.
+/* AFS superblock handling
+ *
+ * Copyright (c) 2002, 2007 Red Hat, Inc. All rights reserved.
*
* This software may be freely redistributed under the terms of the
* GNU General Public License.
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
* Authors: David Howells <dhowells@redhat.com>
- * David Woodhouse <dwmw2@cambridge.redhat.com>
+ * David Woodhouse <dwmw2@redhat.com>
*
*/
#include <linux/slab.h>
#include <linux/fs.h>
#include <linux/pagemap.h>
-#include "vnode.h"
-#include "volume.h"
-#include "cell.h"
-#include "cmservice.h"
-#include "fsclient.h"
-#include "super.h"
#include "internal.h"
#define AFS_FS_MAGIC 0x6B414653 /* 'kAFS' */
-struct afs_mount_params {
- int rwpath;
- struct afs_cell *default_cell;
- struct afs_volume *volume;
-};
-
static void afs_i_init_once(void *foo, struct kmem_cache *cachep,
unsigned long flags);
.fs_flags = FS_BINARY_MOUNTDATA,
};
-static struct super_operations afs_super_ops = {
+static const struct super_operations afs_super_ops = {
.statfs = simple_statfs,
.alloc_inode = afs_alloc_inode,
.drop_inode = generic_delete_inode,
.destroy_inode = afs_destroy_inode,
.clear_inode = afs_clear_inode,
+ .umount_begin = afs_umount_begin,
.put_super = afs_put_super,
};
static struct kmem_cache *afs_inode_cachep;
static atomic_t afs_count_active_inodes;
-/*****************************************************************************/
/*
* initialise the filesystem
*/
_enter("");
- afs_timer_init(&afs_mntpt_expiry_timer, &afs_mntpt_expiry_timer_ops);
-
/* create ourselves an inode cache */
atomic_set(&afs_count_active_inodes, 0);
ret = register_filesystem(&afs_fs_type);
if (ret < 0) {
kmem_cache_destroy(afs_inode_cachep);
- kleave(" = %d", ret);
+ _leave(" = %d", ret);
return ret;
}
- kleave(" = 0");
+ _leave(" = 0");
return 0;
-} /* end afs_fs_init() */
+}
-/*****************************************************************************/
/*
* clean up the filesystem
*/
void __exit afs_fs_exit(void)
{
+ _enter("");
+
+ afs_mntpt_kill_timer();
unregister_filesystem(&afs_fs_type);
if (atomic_read(&afs_count_active_inodes) != 0) {
}
kmem_cache_destroy(afs_inode_cachep);
+ _leave("");
+}
-} /* end afs_fs_exit() */
-
-/*****************************************************************************/
/*
* check that an argument has a value
*/
return 0;
}
return 1;
-} /* end want_arg() */
+}
-/*****************************************************************************/
/*
* check that there's no subsequent value
*/
return 0;
}
return 1;
-} /* end want_no_value() */
+}
-/*****************************************************************************/
/*
* parse the mount options
* - this function has been shamelessly adapted from the ext3 fs which
* shamelessly adapted it from the msdos fs
*/
-static int afs_super_parse_options(struct afs_mount_params *params,
- char *options,
- const char **devname)
+static int afs_parse_options(struct afs_mount_params *params,
+ char *options, const char **devname)
{
+ struct afs_cell *cell;
char *key, *value;
int ret;
options[PAGE_SIZE - 1] = 0;
ret = 0;
- while ((key = strsep(&options, ",")) != 0)
- {
+ while ((key = strsep(&options, ","))) {
value = strchr(key, '=');
if (value)
*value++ = 0;
- printk("kAFS: KEY: %s, VAL:%s\n", key, value ?: "-");
+ _debug("kAFS: KEY: %s, VAL:%s", key, value ?: "-");
if (strcmp(key, "rwpath") == 0) {
if (!want_no_value(&value, "rwpath"))
return -EINVAL;
params->rwpath = 1;
- continue;
- }
- else if (strcmp(key, "vol") == 0) {
+ } else if (strcmp(key, "vol") == 0) {
if (!want_arg(&value, "vol"))
return -EINVAL;
*devname = value;
- continue;
- }
- else if (strcmp(key, "cell") == 0) {
+ } else if (strcmp(key, "cell") == 0) {
if (!want_arg(&value, "cell"))
return -EINVAL;
- afs_put_cell(params->default_cell);
- ret = afs_cell_lookup(value,
- strlen(value),
- ¶ms->default_cell);
- if (ret < 0)
- return -EINVAL;
- continue;
+ cell = afs_cell_lookup(value, strlen(value));
+ if (IS_ERR(cell))
+ return PTR_ERR(cell);
+ afs_put_cell(params->cell);
+ params->cell = cell;
+ } else {
+ printk("kAFS: Unknown mount option: '%s'\n", key);
+ ret = -EINVAL;
+ goto error;
}
-
- printk("kAFS: Unknown mount option: '%s'\n", key);
- ret = -EINVAL;
- goto error;
}
ret = 0;
-
- error:
+error:
_leave(" = %d", ret);
return ret;
-} /* end afs_super_parse_options() */
+}
+
+/*
+ * parse a device name to get cell name, volume name, volume type and R/W
+ * selector
+ * - this can be one of the following:
+ * "%[cell:]volume[.]" R/W volume
+ * "#[cell:]volume[.]" R/O or R/W volume (rwpath=0),
+ * or R/W (rwpath=1) volume
+ * "%[cell:]volume.readonly" R/O volume
+ * "#[cell:]volume.readonly" R/O volume
+ * "%[cell:]volume.backup" Backup volume
+ * "#[cell:]volume.backup" Backup volume
+ */
+static int afs_parse_device_name(struct afs_mount_params *params,
+ const char *name)
+{
+ struct afs_cell *cell;
+ const char *cellname, *suffix;
+ int cellnamesz;
+
+ _enter(",%s", name);
+
+ if (!name) {
+ printk(KERN_ERR "kAFS: no volume name specified\n");
+ return -EINVAL;
+ }
+
+ if ((name[0] != '%' && name[0] != '#') || !name[1]) {
+ printk(KERN_ERR "kAFS: unparsable volume name\n");
+ return -EINVAL;
+ }
+
+ /* determine the type of volume we're looking for */
+ params->type = AFSVL_ROVOL;
+ params->force = false;
+ if (params->rwpath || name[0] == '%') {
+ params->type = AFSVL_RWVOL;
+ params->force = true;
+ }
+ name++;
+
+ /* split the cell name out if there is one */
+ params->volname = strchr(name, ':');
+ if (params->volname) {
+ cellname = name;
+ cellnamesz = params->volname - name;
+ params->volname++;
+ } else {
+ params->volname = name;
+ cellname = NULL;
+ cellnamesz = 0;
+ }
+
+ /* the volume type is further affected by a possible suffix */
+ suffix = strrchr(params->volname, '.');
+ if (suffix) {
+ if (strcmp(suffix, ".readonly") == 0) {
+ params->type = AFSVL_ROVOL;
+ params->force = true;
+ } else if (strcmp(suffix, ".backup") == 0) {
+ params->type = AFSVL_BACKVOL;
+ params->force = true;
+ } else if (suffix[1] == 0) {
+ } else {
+ suffix = NULL;
+ }
+ }
+
+ params->volnamesz = suffix ?
+ suffix - params->volname : strlen(params->volname);
+
+ _debug("cell %*.*s [%p]",
+ cellnamesz, cellnamesz, cellname ?: "", params->cell);
+
+ /* lookup the cell record */
+ if (cellname || !params->cell) {
+ cell = afs_cell_lookup(cellname, cellnamesz);
+ if (IS_ERR(cell)) {
+ printk(KERN_ERR "kAFS: unable to lookup cell '%s'\n",
+ cellname ?: "");
+ return PTR_ERR(cell);
+ }
+ afs_put_cell(params->cell);
+ params->cell = cell;
+ }
+
+ _debug("CELL:%s [%p] VOLUME:%*.*s SUFFIX:%s TYPE:%d%s",
+ params->cell->name, params->cell,
+ params->volnamesz, params->volnamesz, params->volname,
+ suffix ?: "-", params->type, params->force ? " FORCE" : "");
+
+ return 0;
+}
-/*****************************************************************************/
/*
* check a superblock to see if it's the one we're looking for
*/
struct afs_super_info *as = sb->s_fs_info;
return as->volume == params->volume;
-} /* end afs_test_super() */
+}
-/*****************************************************************************/
/*
* fill in the superblock
*/
-static int afs_fill_super(struct super_block *sb, void *data, int silent)
+static int afs_fill_super(struct super_block *sb, void *data)
{
struct afs_mount_params *params = data;
struct afs_super_info *as = NULL;
struct inode *inode = NULL;
int ret;
- kenter("");
+ _enter("");
/* allocate a superblock info record */
as = kzalloc(sizeof(struct afs_super_info), GFP_KERNEL);
fid.vid = as->volume->vid;
fid.vnode = 1;
fid.unique = 1;
- ret = afs_iget(sb, &fid, &inode);
- if (ret < 0)
- goto error;
+ inode = afs_iget(sb, params->key, &fid);
+ if (IS_ERR(inode))
+ goto error_inode;
ret = -ENOMEM;
root = d_alloc_root(inode);
sb->s_root = root;
- kleave(" = 0");
+ _leave(" = 0");
return 0;
- error:
+error_inode:
+ ret = PTR_ERR(inode);
+ inode = NULL;
+error:
iput(inode);
afs_put_volume(as->volume);
kfree(as);
sb->s_fs_info = NULL;
- kleave(" = %d", ret);
+ _leave(" = %d", ret);
return ret;
-} /* end afs_fill_super() */
+}
-/*****************************************************************************/
/*
* get an AFS superblock
* - TODO: don't use get_sb_nodev(), but rather call sget() directly
{
struct afs_mount_params params;
struct super_block *sb;
+ struct afs_volume *vol;
+ struct key *key;
int ret;
_enter(",,%s,%p", dev_name, options);
memset(¶ms, 0, sizeof(params));
- /* start the cache manager */
- ret = afscm_start();
- if (ret < 0) {
- _leave(" = %d", ret);
- return ret;
- }
-
- /* parse the options */
+ /* parse the options and device name */
if (options) {
- ret = afs_super_parse_options(¶ms, options, &dev_name);
+ ret = afs_parse_options(¶ms, options, &dev_name);
if (ret < 0)
goto error;
- if (!dev_name) {
- printk("kAFS: no volume name specified\n");
- ret = -EINVAL;
- goto error;
- }
}
- /* parse the device name */
- ret = afs_volume_lookup(dev_name,
- params.default_cell,
- params.rwpath,
- ¶ms.volume);
+
+ ret = afs_parse_device_name(¶ms, dev_name);
if (ret < 0)
goto error;
- /* allocate a deviceless superblock */
- sb = sget(fs_type, afs_test_super, set_anon_super, ¶ms);
- if (IS_ERR(sb))
+ /* try and do the mount securely */
+ key = afs_request_key(params.cell);
+ if (IS_ERR(key)) {
+ _leave(" = %ld [key]", PTR_ERR(key));
+ ret = PTR_ERR(key);
goto error;
+ }
+ params.key = key;
- sb->s_flags = flags;
+ /* parse the device name */
+ vol = afs_volume_lookup(¶ms);
+ if (IS_ERR(vol)) {
+ ret = PTR_ERR(vol);
+ goto error;
+ }
+ params.volume = vol;
- ret = afs_fill_super(sb, ¶ms, flags & MS_SILENT ? 1 : 0);
- if (ret < 0) {
- up_write(&sb->s_umount);
- deactivate_super(sb);
+ /* allocate a deviceless superblock */
+ sb = sget(fs_type, afs_test_super, set_anon_super, ¶ms);
+ if (IS_ERR(sb)) {
+ ret = PTR_ERR(sb);
goto error;
}
- sb->s_flags |= MS_ACTIVE;
- simple_set_mnt(mnt, sb);
+ if (!sb->s_root) {
+ /* initial superblock/root creation */
+ _debug("create");
+ sb->s_flags = flags;
+ ret = afs_fill_super(sb, ¶ms);
+ if (ret < 0) {
+ up_write(&sb->s_umount);
+ deactivate_super(sb);
+ goto error;
+ }
+ sb->s_flags |= MS_ACTIVE;
+ } else {
+ _debug("reuse");
+ ASSERTCMP(sb->s_flags, &, MS_ACTIVE);
+ }
+
+ simple_set_mnt(mnt, sb);
afs_put_volume(params.volume);
- afs_put_cell(params.default_cell);
- _leave(" = 0 [%p]", 0, sb);
+ afs_put_cell(params.cell);
+ _leave(" = 0 [%p]", sb);
return 0;
- error:
+error:
afs_put_volume(params.volume);
- afs_put_cell(params.default_cell);
- afscm_stop();
+ afs_put_cell(params.cell);
+ key_put(params.key);
_leave(" = %d", ret);
return ret;
-} /* end afs_get_sb() */
+}
-/*****************************************************************************/
/*
* finish the unmounting process on the superblock
*/
_enter("");
afs_put_volume(as->volume);
- afscm_stop();
_leave("");
-} /* end afs_put_super() */
+}
-/*****************************************************************************/
/*
* initialise an inode cache slab element prior to any use
*/
static void afs_i_init_once(void *_vnode, struct kmem_cache *cachep,
unsigned long flags)
{
- struct afs_vnode *vnode = (struct afs_vnode *) _vnode;
+ struct afs_vnode *vnode = _vnode;
if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
SLAB_CTOR_CONSTRUCTOR) {
memset(vnode, 0, sizeof(*vnode));
inode_init_once(&vnode->vfs_inode);
init_waitqueue_head(&vnode->update_waitq);
+ mutex_init(&vnode->permits_lock);
spin_lock_init(&vnode->lock);
- INIT_LIST_HEAD(&vnode->cb_link);
- INIT_LIST_HEAD(&vnode->cb_hash_link);
- afs_timer_init(&vnode->cb_timeout,
- &afs_vnode_cb_timed_out_ops);
+ INIT_WORK(&vnode->cb_broken_work, afs_broken_callback_work);
+ mutex_init(&vnode->cb_broken_lock);
}
+}
-} /* end afs_i_init_once() */
-
-/*****************************************************************************/
/*
* allocate an AFS inode struct from our slab cache
*/
{
struct afs_vnode *vnode;
- vnode = (struct afs_vnode *)
- kmem_cache_alloc(afs_inode_cachep, GFP_KERNEL);
+ vnode = kmem_cache_alloc(afs_inode_cachep, GFP_KERNEL);
if (!vnode)
return NULL;
vnode->volume = NULL;
vnode->update_cnt = 0;
vnode->flags = 0;
+ vnode->cb_promised = false;
return &vnode->vfs_inode;
-} /* end afs_alloc_inode() */
+}
-/*****************************************************************************/
/*
* destroy an AFS inode struct
*/
static void afs_destroy_inode(struct inode *inode)
{
+ struct afs_vnode *vnode = AFS_FS_I(inode);
+
_enter("{%lu}", inode->i_ino);
- kmem_cache_free(afs_inode_cachep, AFS_FS_I(inode));
+ _debug("DESTROY INODE %p", inode);
- atomic_dec(&afs_count_active_inodes);
+ ASSERTCMP(vnode->server, ==, NULL);
-} /* end afs_destroy_inode() */
+ kmem_cache_free(afs_inode_cachep, vnode);
+ atomic_dec(&afs_count_active_inodes);
+}
Code Review / linux-2.6.git / blobdiff