/* AFS superblock handling
|
*
|
* Copyright (c) 2002, 2007, 2018 Red Hat, Inc. All rights reserved.
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*
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* This software may be freely redistributed under the terms of the
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* GNU General Public License.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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* Authors: David Howells <dhowells@redhat.com>
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* David Woodhouse <dwmw2@infradead.org>
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*
|
*/
|
|
#include <linux/kernel.h>
|
#include <linux/module.h>
|
#include <linux/mount.h>
|
#include <linux/init.h>
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#include <linux/slab.h>
|
#include <linux/fs.h>
|
#include <linux/pagemap.h>
|
#include <linux/fs_parser.h>
|
#include <linux/statfs.h>
|
#include <linux/sched.h>
|
#include <linux/nsproxy.h>
|
#include <linux/magic.h>
|
#include <net/net_namespace.h>
|
#include "internal.h"
|
|
static void afs_i_init_once(void *foo);
|
static void afs_kill_super(struct super_block *sb);
|
static struct inode *afs_alloc_inode(struct super_block *sb);
|
static void afs_destroy_inode(struct inode *inode);
|
static void afs_free_inode(struct inode *inode);
|
static int afs_statfs(struct dentry *dentry, struct kstatfs *buf);
|
static int afs_show_devname(struct seq_file *m, struct dentry *root);
|
static int afs_show_options(struct seq_file *m, struct dentry *root);
|
static int afs_init_fs_context(struct fs_context *fc);
|
static const struct fs_parameter_spec afs_fs_parameters[];
|
|
struct file_system_type afs_fs_type = {
|
.owner = THIS_MODULE,
|
.name = "afs",
|
.init_fs_context = afs_init_fs_context,
|
.parameters = afs_fs_parameters,
|
.kill_sb = afs_kill_super,
|
.fs_flags = FS_RENAME_DOES_D_MOVE,
|
};
|
MODULE_ALIAS_FS("afs");
|
|
int afs_net_id;
|
|
static const struct super_operations afs_super_ops = {
|
.statfs = afs_statfs,
|
.alloc_inode = afs_alloc_inode,
|
.drop_inode = afs_drop_inode,
|
.destroy_inode = afs_destroy_inode,
|
.free_inode = afs_free_inode,
|
.evict_inode = afs_evict_inode,
|
.show_devname = afs_show_devname,
|
.show_options = afs_show_options,
|
};
|
|
static struct kmem_cache *afs_inode_cachep;
|
static atomic_t afs_count_active_inodes;
|
|
enum afs_param {
|
Opt_autocell,
|
Opt_dyn,
|
Opt_flock,
|
Opt_source,
|
};
|
|
static const struct constant_table afs_param_flock[] = {
|
{"local", afs_flock_mode_local },
|
{"openafs", afs_flock_mode_openafs },
|
{"strict", afs_flock_mode_strict },
|
{"write", afs_flock_mode_write },
|
{}
|
};
|
|
static const struct fs_parameter_spec afs_fs_parameters[] = {
|
fsparam_flag ("autocell", Opt_autocell),
|
fsparam_flag ("dyn", Opt_dyn),
|
fsparam_enum ("flock", Opt_flock, afs_param_flock),
|
fsparam_string("source", Opt_source),
|
{}
|
};
|
|
/*
|
* initialise the filesystem
|
*/
|
int __init afs_fs_init(void)
|
{
|
int ret;
|
|
_enter("");
|
|
/* create ourselves an inode cache */
|
atomic_set(&afs_count_active_inodes, 0);
|
|
ret = -ENOMEM;
|
afs_inode_cachep = kmem_cache_create("afs_inode_cache",
|
sizeof(struct afs_vnode),
|
0,
|
SLAB_HWCACHE_ALIGN|SLAB_ACCOUNT,
|
afs_i_init_once);
|
if (!afs_inode_cachep) {
|
printk(KERN_NOTICE "kAFS: Failed to allocate inode cache\n");
|
return ret;
|
}
|
|
/* now export our filesystem to lesser mortals */
|
ret = register_filesystem(&afs_fs_type);
|
if (ret < 0) {
|
kmem_cache_destroy(afs_inode_cachep);
|
_leave(" = %d", ret);
|
return ret;
|
}
|
|
_leave(" = 0");
|
return 0;
|
}
|
|
/*
|
* clean up the filesystem
|
*/
|
void afs_fs_exit(void)
|
{
|
_enter("");
|
|
afs_mntpt_kill_timer();
|
unregister_filesystem(&afs_fs_type);
|
|
if (atomic_read(&afs_count_active_inodes) != 0) {
|
printk("kAFS: %d active inode objects still present\n",
|
atomic_read(&afs_count_active_inodes));
|
BUG();
|
}
|
|
/*
|
* Make sure all delayed rcu free inodes are flushed before we
|
* destroy cache.
|
*/
|
rcu_barrier();
|
kmem_cache_destroy(afs_inode_cachep);
|
_leave("");
|
}
|
|
/*
|
* Display the mount device name in /proc/mounts.
|
*/
|
static int afs_show_devname(struct seq_file *m, struct dentry *root)
|
{
|
struct afs_super_info *as = AFS_FS_S(root->d_sb);
|
struct afs_volume *volume = as->volume;
|
struct afs_cell *cell = as->cell;
|
const char *suf = "";
|
char pref = '%';
|
|
if (as->dyn_root) {
|
seq_puts(m, "none");
|
return 0;
|
}
|
|
switch (volume->type) {
|
case AFSVL_RWVOL:
|
break;
|
case AFSVL_ROVOL:
|
pref = '#';
|
if (volume->type_force)
|
suf = ".readonly";
|
break;
|
case AFSVL_BACKVOL:
|
pref = '#';
|
suf = ".backup";
|
break;
|
}
|
|
seq_printf(m, "%c%s:%s%s", pref, cell->name, volume->name, suf);
|
return 0;
|
}
|
|
/*
|
* Display the mount options in /proc/mounts.
|
*/
|
static int afs_show_options(struct seq_file *m, struct dentry *root)
|
{
|
struct afs_super_info *as = AFS_FS_S(root->d_sb);
|
const char *p = NULL;
|
|
if (as->dyn_root)
|
seq_puts(m, ",dyn");
|
if (test_bit(AFS_VNODE_AUTOCELL, &AFS_FS_I(d_inode(root))->flags))
|
seq_puts(m, ",autocell");
|
switch (as->flock_mode) {
|
case afs_flock_mode_unset: break;
|
case afs_flock_mode_local: p = "local"; break;
|
case afs_flock_mode_openafs: p = "openafs"; break;
|
case afs_flock_mode_strict: p = "strict"; break;
|
case afs_flock_mode_write: p = "write"; break;
|
}
|
if (p)
|
seq_printf(m, ",flock=%s", p);
|
|
return 0;
|
}
|
|
/*
|
* Parse the source 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 (R/O parent),
|
* or R/W (R/W parent) 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_source(struct fs_context *fc, struct fs_parameter *param)
|
{
|
struct afs_fs_context *ctx = fc->fs_private;
|
struct afs_cell *cell;
|
const char *cellname, *suffix, *name = param->string;
|
int cellnamesz;
|
|
_enter(",%s", name);
|
|
if (fc->source)
|
return invalf(fc, "kAFS: Multiple sources not supported");
|
|
if (!name) {
|
printk(KERN_ERR "kAFS: no volume name specified\n");
|
return -EINVAL;
|
}
|
|
if ((name[0] != '%' && name[0] != '#') || !name[1]) {
|
/* To use dynroot, we don't want to have to provide a source */
|
if (strcmp(name, "none") == 0) {
|
ctx->no_cell = true;
|
return 0;
|
}
|
printk(KERN_ERR "kAFS: unparsable volume name\n");
|
return -EINVAL;
|
}
|
|
/* determine the type of volume we're looking for */
|
if (name[0] == '%') {
|
ctx->type = AFSVL_RWVOL;
|
ctx->force = true;
|
}
|
name++;
|
|
/* split the cell name out if there is one */
|
ctx->volname = strchr(name, ':');
|
if (ctx->volname) {
|
cellname = name;
|
cellnamesz = ctx->volname - name;
|
ctx->volname++;
|
} else {
|
ctx->volname = name;
|
cellname = NULL;
|
cellnamesz = 0;
|
}
|
|
/* the volume type is further affected by a possible suffix */
|
suffix = strrchr(ctx->volname, '.');
|
if (suffix) {
|
if (strcmp(suffix, ".readonly") == 0) {
|
ctx->type = AFSVL_ROVOL;
|
ctx->force = true;
|
} else if (strcmp(suffix, ".backup") == 0) {
|
ctx->type = AFSVL_BACKVOL;
|
ctx->force = true;
|
} else if (suffix[1] == 0) {
|
} else {
|
suffix = NULL;
|
}
|
}
|
|
ctx->volnamesz = suffix ?
|
suffix - ctx->volname : strlen(ctx->volname);
|
|
_debug("cell %*.*s [%p]",
|
cellnamesz, cellnamesz, cellname ?: "", ctx->cell);
|
|
/* lookup the cell record */
|
if (cellname) {
|
cell = afs_lookup_cell(ctx->net, cellname, cellnamesz,
|
NULL, false);
|
if (IS_ERR(cell)) {
|
pr_err("kAFS: unable to lookup cell '%*.*s'\n",
|
cellnamesz, cellnamesz, cellname ?: "");
|
return PTR_ERR(cell);
|
}
|
afs_unuse_cell(ctx->net, ctx->cell, afs_cell_trace_unuse_parse);
|
afs_see_cell(cell, afs_cell_trace_see_source);
|
ctx->cell = cell;
|
}
|
|
_debug("CELL:%s [%p] VOLUME:%*.*s SUFFIX:%s TYPE:%d%s",
|
ctx->cell->name, ctx->cell,
|
ctx->volnamesz, ctx->volnamesz, ctx->volname,
|
suffix ?: "-", ctx->type, ctx->force ? " FORCE" : "");
|
|
fc->source = param->string;
|
param->string = NULL;
|
return 0;
|
}
|
|
/*
|
* Parse a single mount parameter.
|
*/
|
static int afs_parse_param(struct fs_context *fc, struct fs_parameter *param)
|
{
|
struct fs_parse_result result;
|
struct afs_fs_context *ctx = fc->fs_private;
|
int opt;
|
|
opt = fs_parse(fc, afs_fs_parameters, param, &result);
|
if (opt < 0)
|
return opt;
|
|
switch (opt) {
|
case Opt_source:
|
return afs_parse_source(fc, param);
|
|
case Opt_autocell:
|
ctx->autocell = true;
|
break;
|
|
case Opt_dyn:
|
ctx->dyn_root = true;
|
break;
|
|
case Opt_flock:
|
ctx->flock_mode = result.uint_32;
|
break;
|
|
default:
|
return -EINVAL;
|
}
|
|
_leave(" = 0");
|
return 0;
|
}
|
|
/*
|
* Validate the options, get the cell key and look up the volume.
|
*/
|
static int afs_validate_fc(struct fs_context *fc)
|
{
|
struct afs_fs_context *ctx = fc->fs_private;
|
struct afs_volume *volume;
|
struct afs_cell *cell;
|
struct key *key;
|
int ret;
|
|
if (!ctx->dyn_root) {
|
if (ctx->no_cell) {
|
pr_warn("kAFS: Can only specify source 'none' with -o dyn\n");
|
return -EINVAL;
|
}
|
|
if (!ctx->cell) {
|
pr_warn("kAFS: No cell specified\n");
|
return -EDESTADDRREQ;
|
}
|
|
reget_key:
|
/* We try to do the mount securely. */
|
key = afs_request_key(ctx->cell);
|
if (IS_ERR(key))
|
return PTR_ERR(key);
|
|
ctx->key = key;
|
|
if (ctx->volume) {
|
afs_put_volume(ctx->net, ctx->volume,
|
afs_volume_trace_put_validate_fc);
|
ctx->volume = NULL;
|
}
|
|
if (test_bit(AFS_CELL_FL_CHECK_ALIAS, &ctx->cell->flags)) {
|
ret = afs_cell_detect_alias(ctx->cell, key);
|
if (ret < 0)
|
return ret;
|
if (ret == 1) {
|
_debug("switch to alias");
|
key_put(ctx->key);
|
ctx->key = NULL;
|
cell = afs_use_cell(ctx->cell->alias_of,
|
afs_cell_trace_use_fc_alias);
|
afs_unuse_cell(ctx->net, ctx->cell, afs_cell_trace_unuse_fc);
|
ctx->cell = cell;
|
goto reget_key;
|
}
|
}
|
|
volume = afs_create_volume(ctx);
|
if (IS_ERR(volume))
|
return PTR_ERR(volume);
|
|
ctx->volume = volume;
|
}
|
|
return 0;
|
}
|
|
/*
|
* check a superblock to see if it's the one we're looking for
|
*/
|
static int afs_test_super(struct super_block *sb, struct fs_context *fc)
|
{
|
struct afs_fs_context *ctx = fc->fs_private;
|
struct afs_super_info *as = AFS_FS_S(sb);
|
|
return (as->net_ns == fc->net_ns &&
|
as->volume &&
|
as->volume->vid == ctx->volume->vid &&
|
as->cell == ctx->cell &&
|
!as->dyn_root);
|
}
|
|
static int afs_dynroot_test_super(struct super_block *sb, struct fs_context *fc)
|
{
|
struct afs_super_info *as = AFS_FS_S(sb);
|
|
return (as->net_ns == fc->net_ns &&
|
as->dyn_root);
|
}
|
|
static int afs_set_super(struct super_block *sb, struct fs_context *fc)
|
{
|
return set_anon_super(sb, NULL);
|
}
|
|
/*
|
* fill in the superblock
|
*/
|
static int afs_fill_super(struct super_block *sb, struct afs_fs_context *ctx)
|
{
|
struct afs_super_info *as = AFS_FS_S(sb);
|
struct inode *inode = NULL;
|
int ret;
|
|
_enter("");
|
|
/* fill in the superblock */
|
sb->s_blocksize = PAGE_SIZE;
|
sb->s_blocksize_bits = PAGE_SHIFT;
|
sb->s_maxbytes = MAX_LFS_FILESIZE;
|
sb->s_magic = AFS_FS_MAGIC;
|
sb->s_op = &afs_super_ops;
|
if (!as->dyn_root)
|
sb->s_xattr = afs_xattr_handlers;
|
ret = super_setup_bdi(sb);
|
if (ret)
|
return ret;
|
|
/* allocate the root inode and dentry */
|
if (as->dyn_root) {
|
inode = afs_iget_pseudo_dir(sb, true);
|
} else {
|
sprintf(sb->s_id, "%llu", as->volume->vid);
|
afs_activate_volume(as->volume);
|
inode = afs_root_iget(sb, ctx->key);
|
}
|
|
if (IS_ERR(inode))
|
return PTR_ERR(inode);
|
|
if (ctx->autocell || as->dyn_root)
|
set_bit(AFS_VNODE_AUTOCELL, &AFS_FS_I(inode)->flags);
|
|
ret = -ENOMEM;
|
sb->s_root = d_make_root(inode);
|
if (!sb->s_root)
|
goto error;
|
|
if (as->dyn_root) {
|
sb->s_d_op = &afs_dynroot_dentry_operations;
|
ret = afs_dynroot_populate(sb);
|
if (ret < 0)
|
goto error;
|
} else {
|
sb->s_d_op = &afs_fs_dentry_operations;
|
rcu_assign_pointer(as->volume->sb, sb);
|
}
|
|
_leave(" = 0");
|
return 0;
|
|
error:
|
_leave(" = %d", ret);
|
return ret;
|
}
|
|
static struct afs_super_info *afs_alloc_sbi(struct fs_context *fc)
|
{
|
struct afs_fs_context *ctx = fc->fs_private;
|
struct afs_super_info *as;
|
|
as = kzalloc(sizeof(struct afs_super_info), GFP_KERNEL);
|
if (as) {
|
as->net_ns = get_net(fc->net_ns);
|
as->flock_mode = ctx->flock_mode;
|
if (ctx->dyn_root) {
|
as->dyn_root = true;
|
} else {
|
as->cell = afs_use_cell(ctx->cell, afs_cell_trace_use_sbi);
|
as->volume = afs_get_volume(ctx->volume,
|
afs_volume_trace_get_alloc_sbi);
|
}
|
}
|
return as;
|
}
|
|
static void afs_destroy_sbi(struct afs_super_info *as)
|
{
|
if (as) {
|
struct afs_net *net = afs_net(as->net_ns);
|
afs_put_volume(net, as->volume, afs_volume_trace_put_destroy_sbi);
|
afs_unuse_cell(net, as->cell, afs_cell_trace_unuse_sbi);
|
put_net(as->net_ns);
|
kfree(as);
|
}
|
}
|
|
static void afs_kill_super(struct super_block *sb)
|
{
|
struct afs_super_info *as = AFS_FS_S(sb);
|
|
if (as->dyn_root)
|
afs_dynroot_depopulate(sb);
|
|
/* Clear the callback interests (which will do ilookup5) before
|
* deactivating the superblock.
|
*/
|
if (as->volume)
|
rcu_assign_pointer(as->volume->sb, NULL);
|
kill_anon_super(sb);
|
if (as->volume)
|
afs_deactivate_volume(as->volume);
|
afs_destroy_sbi(as);
|
}
|
|
/*
|
* Get an AFS superblock and root directory.
|
*/
|
static int afs_get_tree(struct fs_context *fc)
|
{
|
struct afs_fs_context *ctx = fc->fs_private;
|
struct super_block *sb;
|
struct afs_super_info *as;
|
int ret;
|
|
ret = afs_validate_fc(fc);
|
if (ret)
|
goto error;
|
|
_enter("");
|
|
/* allocate a superblock info record */
|
ret = -ENOMEM;
|
as = afs_alloc_sbi(fc);
|
if (!as)
|
goto error;
|
fc->s_fs_info = as;
|
|
/* allocate a deviceless superblock */
|
sb = sget_fc(fc,
|
as->dyn_root ? afs_dynroot_test_super : afs_test_super,
|
afs_set_super);
|
if (IS_ERR(sb)) {
|
ret = PTR_ERR(sb);
|
goto error;
|
}
|
|
if (!sb->s_root) {
|
/* initial superblock/root creation */
|
_debug("create");
|
ret = afs_fill_super(sb, ctx);
|
if (ret < 0)
|
goto error_sb;
|
sb->s_flags |= SB_ACTIVE;
|
} else {
|
_debug("reuse");
|
ASSERTCMP(sb->s_flags, &, SB_ACTIVE);
|
}
|
|
fc->root = dget(sb->s_root);
|
trace_afs_get_tree(as->cell, as->volume);
|
_leave(" = 0 [%p]", sb);
|
return 0;
|
|
error_sb:
|
deactivate_locked_super(sb);
|
error:
|
_leave(" = %d", ret);
|
return ret;
|
}
|
|
static void afs_free_fc(struct fs_context *fc)
|
{
|
struct afs_fs_context *ctx = fc->fs_private;
|
|
afs_destroy_sbi(fc->s_fs_info);
|
afs_put_volume(ctx->net, ctx->volume, afs_volume_trace_put_free_fc);
|
afs_unuse_cell(ctx->net, ctx->cell, afs_cell_trace_unuse_fc);
|
key_put(ctx->key);
|
kfree(ctx);
|
}
|
|
static const struct fs_context_operations afs_context_ops = {
|
.free = afs_free_fc,
|
.parse_param = afs_parse_param,
|
.get_tree = afs_get_tree,
|
};
|
|
/*
|
* Set up the filesystem mount context.
|
*/
|
static int afs_init_fs_context(struct fs_context *fc)
|
{
|
struct afs_fs_context *ctx;
|
struct afs_cell *cell;
|
|
ctx = kzalloc(sizeof(struct afs_fs_context), GFP_KERNEL);
|
if (!ctx)
|
return -ENOMEM;
|
|
ctx->type = AFSVL_ROVOL;
|
ctx->net = afs_net(fc->net_ns);
|
|
/* Default to the workstation cell. */
|
cell = afs_find_cell(ctx->net, NULL, 0, afs_cell_trace_use_fc);
|
if (IS_ERR(cell))
|
cell = NULL;
|
ctx->cell = cell;
|
|
fc->fs_private = ctx;
|
fc->ops = &afs_context_ops;
|
return 0;
|
}
|
|
/*
|
* Initialise an inode cache slab element prior to any use. Note that
|
* afs_alloc_inode() *must* reset anything that could incorrectly leak from one
|
* inode to another.
|
*/
|
static void afs_i_init_once(void *_vnode)
|
{
|
struct afs_vnode *vnode = _vnode;
|
|
memset(vnode, 0, sizeof(*vnode));
|
inode_init_once(&vnode->vfs_inode);
|
mutex_init(&vnode->io_lock);
|
init_rwsem(&vnode->validate_lock);
|
spin_lock_init(&vnode->wb_lock);
|
spin_lock_init(&vnode->lock);
|
INIT_LIST_HEAD(&vnode->wb_keys);
|
INIT_LIST_HEAD(&vnode->pending_locks);
|
INIT_LIST_HEAD(&vnode->granted_locks);
|
INIT_DELAYED_WORK(&vnode->lock_work, afs_lock_work);
|
seqlock_init(&vnode->cb_lock);
|
}
|
|
/*
|
* allocate an AFS inode struct from our slab cache
|
*/
|
static struct inode *afs_alloc_inode(struct super_block *sb)
|
{
|
struct afs_vnode *vnode;
|
|
vnode = kmem_cache_alloc(afs_inode_cachep, GFP_KERNEL);
|
if (!vnode)
|
return NULL;
|
|
atomic_inc(&afs_count_active_inodes);
|
|
/* Reset anything that shouldn't leak from one inode to the next. */
|
memset(&vnode->fid, 0, sizeof(vnode->fid));
|
memset(&vnode->status, 0, sizeof(vnode->status));
|
|
vnode->volume = NULL;
|
vnode->lock_key = NULL;
|
vnode->permit_cache = NULL;
|
#ifdef CONFIG_AFS_FSCACHE
|
vnode->cache = NULL;
|
#endif
|
|
vnode->flags = 1 << AFS_VNODE_UNSET;
|
vnode->lock_state = AFS_VNODE_LOCK_NONE;
|
|
init_rwsem(&vnode->rmdir_lock);
|
|
_leave(" = %p", &vnode->vfs_inode);
|
return &vnode->vfs_inode;
|
}
|
|
static void afs_free_inode(struct inode *inode)
|
{
|
kmem_cache_free(afs_inode_cachep, AFS_FS_I(inode));
|
}
|
|
/*
|
* destroy an AFS inode struct
|
*/
|
static void afs_destroy_inode(struct inode *inode)
|
{
|
struct afs_vnode *vnode = AFS_FS_I(inode);
|
|
_enter("%p{%llx:%llu}", inode, vnode->fid.vid, vnode->fid.vnode);
|
|
_debug("DESTROY INODE %p", inode);
|
|
atomic_dec(&afs_count_active_inodes);
|
}
|
|
static void afs_get_volume_status_success(struct afs_operation *op)
|
{
|
struct afs_volume_status *vs = &op->volstatus.vs;
|
struct kstatfs *buf = op->volstatus.buf;
|
|
if (vs->max_quota == 0)
|
buf->f_blocks = vs->part_max_blocks;
|
else
|
buf->f_blocks = vs->max_quota;
|
|
if (buf->f_blocks > vs->blocks_in_use)
|
buf->f_bavail = buf->f_bfree =
|
buf->f_blocks - vs->blocks_in_use;
|
}
|
|
static const struct afs_operation_ops afs_get_volume_status_operation = {
|
.issue_afs_rpc = afs_fs_get_volume_status,
|
.issue_yfs_rpc = yfs_fs_get_volume_status,
|
.success = afs_get_volume_status_success,
|
};
|
|
/*
|
* return information about an AFS volume
|
*/
|
static int afs_statfs(struct dentry *dentry, struct kstatfs *buf)
|
{
|
struct afs_super_info *as = AFS_FS_S(dentry->d_sb);
|
struct afs_operation *op;
|
struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry));
|
|
buf->f_type = dentry->d_sb->s_magic;
|
buf->f_bsize = AFS_BLOCK_SIZE;
|
buf->f_namelen = AFSNAMEMAX - 1;
|
|
if (as->dyn_root) {
|
buf->f_blocks = 1;
|
buf->f_bavail = 0;
|
buf->f_bfree = 0;
|
return 0;
|
}
|
|
op = afs_alloc_operation(NULL, as->volume);
|
if (IS_ERR(op))
|
return PTR_ERR(op);
|
|
afs_op_set_vnode(op, 0, vnode);
|
op->nr_files = 1;
|
op->volstatus.buf = buf;
|
op->ops = &afs_get_volume_status_operation;
|
return afs_do_sync_operation(op);
|
}
|
