afs: Support the AFS dynamic root
Support the AFS dynamic root which is a pseudo-volume that doesn't connect to any server resource, but rather is just a root directory that dynamically creates mountpoint directories where the name of such a directory is the name of the cell. Such a mount can be created thus: mount -t afs none /afs -o dyn Dynamic root superblocks aren't shared except by bind mounts and propagation. Cell root volumes can then be mounted by referring to them by name, e.g.: ls /afs/grand.central.org/ ls /afs/.grand.central.org/ The kernel will upcall to consult the DNS if the address wasn't supplied directly. Signed-off-by: David Howells <dhowells@redhat.com>
This commit is contained in:
David Howells
Родитель
16280a15be
Коммит
4d673da145
|
|
@ -7,6 +7,7 @@ Contents:
|
|||
- Overview.
|
||||
- Usage.
|
||||
- Mountpoints.
|
||||
- Dynamic root.
|
||||
- Proc filesystem.
|
||||
- The cell database.
|
||||
- Security.
|
||||
|
|
@ -127,6 +128,22 @@ mounted on /afs in one go by doing:
|
|||
umount /afs
|
||||
|
||||
|
||||
============
|
||||
DYNAMIC ROOT
|
||||
============
|
||||
|
||||
A mount option is available to create a serverless mount that is only usable
|
||||
for dynamic lookup. Creating such a mount can be done by, for example:
|
||||
|
||||
mount -t afs none /afs -o dyn
|
||||
|
||||
This creates a mount that just has an empty directory at the root. Attempting
|
||||
to look up a name in this directory will cause a mountpoint to be created that
|
||||
looks up a cell of the same name, for example:
|
||||
|
||||
ls /afs/grand.central.org/
|
||||
|
||||
|
||||
===============
|
||||
PROC FILESYSTEM
|
||||
===============
|
||||
|
|
|
|||
122
fs/afs/dir.c
122
fs/afs/dir.c
|
|
@ -17,10 +17,13 @@
|
|||
#include <linux/pagemap.h>
|
||||
#include <linux/ctype.h>
|
||||
#include <linux/sched.h>
|
||||
#include <linux/dns_resolver.h>
|
||||
#include "internal.h"
|
||||
|
||||
static struct dentry *afs_lookup(struct inode *dir, struct dentry *dentry,
|
||||
unsigned int flags);
|
||||
static struct dentry *afs_dynroot_lookup(struct inode *dir, struct dentry *dentry,
|
||||
unsigned int flags);
|
||||
static int afs_dir_open(struct inode *inode, struct file *file);
|
||||
static int afs_readdir(struct file *file, struct dir_context *ctx);
|
||||
static int afs_d_revalidate(struct dentry *dentry, unsigned int flags);
|
||||
|
|
@ -64,6 +67,17 @@ const struct inode_operations afs_dir_inode_operations = {
|
|||
.listxattr = afs_listxattr,
|
||||
};
|
||||
|
||||
const struct file_operations afs_dynroot_file_operations = {
|
||||
.open = dcache_dir_open,
|
||||
.release = dcache_dir_close,
|
||||
.iterate_shared = dcache_readdir,
|
||||
.llseek = dcache_dir_lseek,
|
||||
};
|
||||
|
||||
const struct inode_operations afs_dynroot_inode_operations = {
|
||||
.lookup = afs_dynroot_lookup,
|
||||
};
|
||||
|
||||
const struct dentry_operations afs_fs_dentry_operations = {
|
||||
.d_revalidate = afs_d_revalidate,
|
||||
.d_delete = afs_d_delete,
|
||||
|
|
@ -467,26 +481,59 @@ static int afs_do_lookup(struct inode *dir, struct dentry *dentry,
|
|||
return 0;
|
||||
}
|
||||
|
||||
/*
|
||||
* Probe to see if a cell may exist. This prevents positive dentries from
|
||||
* being created unnecessarily.
|
||||
*/
|
||||
static int afs_probe_cell_name(struct dentry *dentry)
|
||||
{
|
||||
struct afs_cell *cell;
|
||||
const char *name = dentry->d_name.name;
|
||||
size_t len = dentry->d_name.len;
|
||||
int ret;
|
||||
|
||||
/* Names prefixed with a dot are R/W mounts. */
|
||||
if (name[0] == '.') {
|
||||
if (len == 1)
|
||||
return -EINVAL;
|
||||
name++;
|
||||
len--;
|
||||
}
|
||||
|
||||
cell = afs_lookup_cell_rcu(afs_d2net(dentry), name, len);
|
||||
if (!IS_ERR(cell)) {
|
||||
afs_put_cell(afs_d2net(dentry), cell);
|
||||
return 0;
|
||||
}
|
||||
|
||||
ret = dns_query("afsdb", name, len, "ipv4", NULL, NULL);
|
||||
if (ret == -ENODATA)
|
||||
ret = -EDESTADDRREQ;
|
||||
return ret;
|
||||
}
|
||||
|
||||
/*
|
||||
* Try to auto mount the mountpoint with pseudo directory, if the autocell
|
||||
* operation is setted.
|
||||
*/
|
||||
static struct inode *afs_try_auto_mntpt(
|
||||
int ret, struct dentry *dentry, struct inode *dir, struct key *key,
|
||||
struct afs_fid *fid)
|
||||
static struct inode *afs_try_auto_mntpt(struct dentry *dentry,
|
||||
struct inode *dir, struct afs_fid *fid)
|
||||
{
|
||||
const char *devname = dentry->d_name.name;
|
||||
struct afs_vnode *vnode = AFS_FS_I(dir);
|
||||
struct inode *inode;
|
||||
int ret = -ENOENT;
|
||||
|
||||
_enter("%d, %p{%pd}, {%x:%u}, %p",
|
||||
ret, dentry, dentry, vnode->fid.vid, vnode->fid.vnode, key);
|
||||
_enter("%p{%pd}, {%x:%u}",
|
||||
dentry, dentry, vnode->fid.vid, vnode->fid.vnode);
|
||||
|
||||
if (ret != -ENOENT ||
|
||||
!test_bit(AFS_VNODE_AUTOCELL, &vnode->flags))
|
||||
if (!test_bit(AFS_VNODE_AUTOCELL, &vnode->flags))
|
||||
goto out;
|
||||
|
||||
inode = afs_iget_autocell(dir, devname, strlen(devname), key);
|
||||
ret = afs_probe_cell_name(dentry);
|
||||
if (ret < 0)
|
||||
goto out;
|
||||
|
||||
inode = afs_iget_pseudo_dir(dir->i_sb, false);
|
||||
if (IS_ERR(inode)) {
|
||||
ret = PTR_ERR(inode);
|
||||
goto out;
|
||||
|
|
@ -545,13 +592,16 @@ static struct dentry *afs_lookup(struct inode *dir, struct dentry *dentry,
|
|||
|
||||
ret = afs_do_lookup(dir, dentry, &fid, key);
|
||||
if (ret < 0) {
|
||||
inode = afs_try_auto_mntpt(ret, dentry, dir, key, &fid);
|
||||
if (!IS_ERR(inode)) {
|
||||
key_put(key);
|
||||
goto success;
|
||||
if (ret == -ENOENT) {
|
||||
inode = afs_try_auto_mntpt(dentry, dir, &fid);
|
||||
if (!IS_ERR(inode)) {
|
||||
key_put(key);
|
||||
goto success;
|
||||
}
|
||||
|
||||
ret = PTR_ERR(inode);
|
||||
}
|
||||
|
||||
ret = PTR_ERR(inode);
|
||||
key_put(key);
|
||||
if (ret == -ENOENT) {
|
||||
d_add(dentry, NULL);
|
||||
|
|
@ -582,6 +632,46 @@ success:
|
|||
return NULL;
|
||||
}
|
||||
|
||||
/*
|
||||
* Look up an entry in a dynroot directory.
|
||||
*/
|
||||
static struct dentry *afs_dynroot_lookup(struct inode *dir, struct dentry *dentry,
|
||||
unsigned int flags)
|
||||
{
|
||||
struct afs_vnode *vnode;
|
||||
struct afs_fid fid;
|
||||
struct inode *inode;
|
||||
int ret;
|
||||
|
||||
vnode = AFS_FS_I(dir);
|
||||
|
||||
_enter("%pd", dentry);
|
||||
|
||||
ASSERTCMP(d_inode(dentry), ==, NULL);
|
||||
|
||||
if (dentry->d_name.len >= AFSNAMEMAX) {
|
||||
_leave(" = -ENAMETOOLONG");
|
||||
return ERR_PTR(-ENAMETOOLONG);
|
||||
}
|
||||
|
||||
inode = afs_try_auto_mntpt(dentry, dir, &fid);
|
||||
if (IS_ERR(inode)) {
|
||||
ret = PTR_ERR(inode);
|
||||
if (ret == -ENOENT) {
|
||||
d_add(dentry, NULL);
|
||||
_leave(" = NULL [negative]");
|
||||
return NULL;
|
||||
}
|
||||
_leave(" = %d [do]", ret);
|
||||
return ERR_PTR(ret);
|
||||
}
|
||||
|
||||
d_add(dentry, inode);
|
||||
_leave(" = 0 { ino=%lu v=%u }",
|
||||
d_inode(dentry)->i_ino, d_inode(dentry)->i_generation);
|
||||
return NULL;
|
||||
}
|
||||
|
||||
/*
|
||||
* check that a dentry lookup hit has found a valid entry
|
||||
* - NOTE! the hit can be a negative hit too, so we can't assume we have an
|
||||
|
|
@ -589,6 +679,7 @@ success:
|
|||
*/
|
||||
static int afs_d_revalidate(struct dentry *dentry, unsigned int flags)
|
||||
{
|
||||
struct afs_super_info *as = dentry->d_sb->s_fs_info;
|
||||
struct afs_vnode *vnode, *dir;
|
||||
struct afs_fid uninitialized_var(fid);
|
||||
struct dentry *parent;
|
||||
|
|
@ -600,6 +691,9 @@ static int afs_d_revalidate(struct dentry *dentry, unsigned int flags)
|
|||
if (flags & LOOKUP_RCU)
|
||||
return -ECHILD;
|
||||
|
||||
if (as->dyn_root)
|
||||
return 1;
|
||||
|
||||
if (d_really_is_positive(dentry)) {
|
||||
vnode = AFS_FS_I(d_inode(dentry));
|
||||
_enter("{v={%x:%u} n=%pd fl=%lx},",
|
||||
|
|
|
|||
|
|
@ -147,7 +147,7 @@ int afs_iget5_test(struct inode *inode, void *opaque)
|
|||
*
|
||||
* These pseudo inodes don't match anything.
|
||||
*/
|
||||
static int afs_iget5_autocell_test(struct inode *inode, void *opaque)
|
||||
static int afs_iget5_pseudo_dir_test(struct inode *inode, void *opaque)
|
||||
{
|
||||
return 0;
|
||||
}
|
||||
|
|
@ -169,31 +169,34 @@ static int afs_iget5_set(struct inode *inode, void *opaque)
|
|||
}
|
||||
|
||||
/*
|
||||
* inode retrieval for autocell
|
||||
* Create an inode for a dynamic root directory or an autocell dynamic
|
||||
* automount dir.
|
||||
*/
|
||||
struct inode *afs_iget_autocell(struct inode *dir, const char *dev_name,
|
||||
int namesz, struct key *key)
|
||||
struct inode *afs_iget_pseudo_dir(struct super_block *sb, bool root)
|
||||
{
|
||||
struct afs_iget_data data;
|
||||
struct afs_super_info *as;
|
||||
struct afs_vnode *vnode;
|
||||
struct super_block *sb;
|
||||
struct inode *inode;
|
||||
static atomic_t afs_autocell_ino;
|
||||
|
||||
_enter("{%x:%u},%*.*s,",
|
||||
AFS_FS_I(dir)->fid.vid, AFS_FS_I(dir)->fid.vnode,
|
||||
namesz, namesz, dev_name ?: "");
|
||||
_enter("");
|
||||
|
||||
sb = dir->i_sb;
|
||||
as = sb->s_fs_info;
|
||||
data.volume = as->volume;
|
||||
data.fid.vid = as->volume->vid;
|
||||
data.fid.unique = 0;
|
||||
data.fid.vnode = 0;
|
||||
if (as->volume) {
|
||||
data.volume = as->volume;
|
||||
data.fid.vid = as->volume->vid;
|
||||
}
|
||||
if (root) {
|
||||
data.fid.vnode = 1;
|
||||
data.fid.unique = 1;
|
||||
} else {
|
||||
data.fid.vnode = atomic_inc_return(&afs_autocell_ino);
|
||||
data.fid.unique = 0;
|
||||
}
|
||||
|
||||
inode = iget5_locked(sb, atomic_inc_return(&afs_autocell_ino),
|
||||
afs_iget5_autocell_test, afs_iget5_set,
|
||||
inode = iget5_locked(sb, data.fid.vnode,
|
||||
afs_iget5_pseudo_dir_test, afs_iget5_set,
|
||||
&data);
|
||||
if (!inode) {
|
||||
_leave(" = -ENOMEM");
|
||||
|
|
@ -211,7 +214,12 @@ struct inode *afs_iget_autocell(struct inode *dir, const char *dev_name,
|
|||
|
||||
inode->i_size = 0;
|
||||
inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO;
|
||||
inode->i_op = &afs_autocell_inode_operations;
|
||||
if (root) {
|
||||
inode->i_op = &afs_dynroot_inode_operations;
|
||||
inode->i_fop = &afs_dynroot_file_operations;
|
||||
} else {
|
||||
inode->i_op = &afs_autocell_inode_operations;
|
||||
}
|
||||
set_nlink(inode, 2);
|
||||
inode->i_uid = GLOBAL_ROOT_UID;
|
||||
inode->i_gid = GLOBAL_ROOT_GID;
|
||||
|
|
@ -223,8 +231,12 @@ struct inode *afs_iget_autocell(struct inode *dir, const char *dev_name,
|
|||
inode->i_generation = 0;
|
||||
|
||||
set_bit(AFS_VNODE_PSEUDODIR, &vnode->flags);
|
||||
set_bit(AFS_VNODE_MOUNTPOINT, &vnode->flags);
|
||||
inode->i_flags |= S_AUTOMOUNT | S_NOATIME;
|
||||
if (!root) {
|
||||
set_bit(AFS_VNODE_MOUNTPOINT, &vnode->flags);
|
||||
inode->i_flags |= S_AUTOMOUNT;
|
||||
}
|
||||
|
||||
inode->i_flags |= S_NOATIME;
|
||||
unlock_new_inode(inode);
|
||||
_leave(" = %p", inode);
|
||||
return inode;
|
||||
|
|
|
|||
|
|
@ -36,6 +36,7 @@ struct afs_mount_params {
|
|||
bool rwpath; /* T if the parent should be considered R/W */
|
||||
bool force; /* T to force cell type */
|
||||
bool autocell; /* T if set auto mount operation */
|
||||
bool dyn_root; /* T if dynamic root */
|
||||
afs_voltype_t type; /* type of volume requested */
|
||||
int volnamesz; /* size of volume name */
|
||||
const char *volname; /* name of volume to mount */
|
||||
|
|
@ -186,6 +187,7 @@ struct afs_super_info {
|
|||
struct afs_net *net; /* Network namespace */
|
||||
struct afs_cell *cell; /* The cell in which the volume resides */
|
||||
struct afs_volume *volume; /* volume record */
|
||||
bool dyn_root; /* True if dynamic root */
|
||||
};
|
||||
|
||||
static inline struct afs_super_info *AFS_FS_S(struct super_block *sb)
|
||||
|
|
@ -634,10 +636,13 @@ extern bool afs_cm_incoming_call(struct afs_call *);
|
|||
/*
|
||||
* dir.c
|
||||
*/
|
||||
extern bool afs_dir_check_page(struct inode *, struct page *);
|
||||
extern const struct inode_operations afs_dir_inode_operations;
|
||||
extern const struct dentry_operations afs_fs_dentry_operations;
|
||||
extern const struct file_operations afs_dir_file_operations;
|
||||
extern const struct inode_operations afs_dir_inode_operations;
|
||||
extern const struct file_operations afs_dynroot_file_operations;
|
||||
extern const struct inode_operations afs_dynroot_inode_operations;
|
||||
extern const struct dentry_operations afs_fs_dentry_operations;
|
||||
|
||||
extern bool afs_dir_check_page(struct inode *, struct page *);
|
||||
|
||||
/*
|
||||
* file.c
|
||||
|
|
@ -695,8 +700,7 @@ extern int afs_fs_get_capabilities(struct afs_net *, struct afs_server *,
|
|||
*/
|
||||
extern int afs_fetch_status(struct afs_vnode *, struct key *);
|
||||
extern int afs_iget5_test(struct inode *, void *);
|
||||
extern struct inode *afs_iget_autocell(struct inode *, const char *, int,
|
||||
struct key *);
|
||||
extern struct inode *afs_iget_pseudo_dir(struct super_block *, bool);
|
||||
extern struct inode *afs_iget(struct super_block *, struct key *,
|
||||
struct afs_fid *, struct afs_file_status *,
|
||||
struct afs_callback *,
|
||||
|
|
|
|||
|
|
@ -72,7 +72,7 @@ static int afs_mntpt_open(struct inode *inode, struct file *file)
|
|||
*/
|
||||
static struct vfsmount *afs_mntpt_do_automount(struct dentry *mntpt)
|
||||
{
|
||||
struct afs_super_info *super;
|
||||
struct afs_super_info *as;
|
||||
struct vfsmount *mnt;
|
||||
struct afs_vnode *vnode;
|
||||
struct page *page;
|
||||
|
|
@ -104,13 +104,13 @@ static struct vfsmount *afs_mntpt_do_automount(struct dentry *mntpt)
|
|||
goto error_no_page;
|
||||
|
||||
if (mntpt->d_name.name[0] == '.') {
|
||||
devname[0] = '#';
|
||||
memcpy(devname + 1, mntpt->d_name.name, size - 1);
|
||||
devname[0] = '%';
|
||||
memcpy(devname + 1, mntpt->d_name.name + 1, size - 1);
|
||||
memcpy(devname + size, afs_root_cell,
|
||||
sizeof(afs_root_cell));
|
||||
rwpath = true;
|
||||
} else {
|
||||
devname[0] = '%';
|
||||
devname[0] = '#';
|
||||
memcpy(devname + 1, mntpt->d_name.name, size);
|
||||
memcpy(devname + size + 1, afs_root_cell,
|
||||
sizeof(afs_root_cell));
|
||||
|
|
@ -142,11 +142,13 @@ static struct vfsmount *afs_mntpt_do_automount(struct dentry *mntpt)
|
|||
}
|
||||
|
||||
/* work out what options we want */
|
||||
super = AFS_FS_S(mntpt->d_sb);
|
||||
memcpy(options, "cell=", 5);
|
||||
strcpy(options + 5, super->volume->cell->name);
|
||||
if (super->volume->type == AFSVL_RWVOL || rwpath)
|
||||
strcat(options, ",rwpath");
|
||||
as = AFS_FS_S(mntpt->d_sb);
|
||||
if (as->cell) {
|
||||
memcpy(options, "cell=", 5);
|
||||
strcpy(options + 5, as->cell->name);
|
||||
if ((as->volume && as->volume->type == AFSVL_RWVOL) || rwpath)
|
||||
strcat(options, ",rwpath");
|
||||
}
|
||||
|
||||
/* try and do the mount */
|
||||
_debug("--- attempting mount %s -o %s ---", devname, options);
|
||||
|
|
|
|||
132
fs/afs/super.c
132
fs/afs/super.c
|
|
@ -64,6 +64,7 @@ static atomic_t afs_count_active_inodes;
|
|||
enum {
|
||||
afs_no_opt,
|
||||
afs_opt_cell,
|
||||
afs_opt_dyn,
|
||||
afs_opt_rwpath,
|
||||
afs_opt_vol,
|
||||
afs_opt_autocell,
|
||||
|
|
@ -71,6 +72,7 @@ enum {
|
|||
|
||||
static const match_table_t afs_options_list = {
|
||||
{ afs_opt_cell, "cell=%s" },
|
||||
{ afs_opt_dyn, "dyn" },
|
||||
{ afs_opt_rwpath, "rwpath" },
|
||||
{ afs_opt_vol, "vol=%s" },
|
||||
{ afs_opt_autocell, "autocell" },
|
||||
|
|
@ -148,6 +150,11 @@ static int afs_show_devname(struct seq_file *m, struct dentry *root)
|
|||
const char *suf = "";
|
||||
char pref = '%';
|
||||
|
||||
if (as->dyn_root) {
|
||||
seq_puts(m, "none");
|
||||
return 0;
|
||||
}
|
||||
|
||||
switch (volume->type) {
|
||||
case AFSVL_RWVOL:
|
||||
break;
|
||||
|
|
@ -171,8 +178,12 @@ static int afs_show_devname(struct seq_file *m, struct dentry *root)
|
|||
*/
|
||||
static int afs_show_options(struct seq_file *m, struct dentry *root)
|
||||
{
|
||||
struct afs_super_info *as = AFS_FS_S(root->d_sb);
|
||||
|
||||
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");
|
||||
seq_puts(m, ",autocell");
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
|
@ -212,7 +223,7 @@ static int afs_parse_options(struct afs_mount_params *params,
|
|||
break;
|
||||
|
||||
case afs_opt_rwpath:
|
||||
params->rwpath = 1;
|
||||
params->rwpath = true;
|
||||
break;
|
||||
|
||||
case afs_opt_vol:
|
||||
|
|
@ -220,7 +231,11 @@ static int afs_parse_options(struct afs_mount_params *params,
|
|||
break;
|
||||
|
||||
case afs_opt_autocell:
|
||||
params->autocell = 1;
|
||||
params->autocell = true;
|
||||
break;
|
||||
|
||||
case afs_opt_dyn:
|
||||
params->dyn_root = true;
|
||||
break;
|
||||
|
||||
default:
|
||||
|
|
@ -254,7 +269,7 @@ static int afs_parse_device_name(struct afs_mount_params *params,
|
|||
int cellnamesz;
|
||||
|
||||
_enter(",%s", name);
|
||||
|
||||
|
||||
if (!name) {
|
||||
printk(KERN_ERR "kAFS: no volume name specified\n");
|
||||
return -EINVAL;
|
||||
|
|
@ -336,7 +351,14 @@ static int afs_test_super(struct super_block *sb, void *data)
|
|||
struct afs_super_info *as1 = data;
|
||||
struct afs_super_info *as = AFS_FS_S(sb);
|
||||
|
||||
return as->net == as1->net && as->volume->vid == as1->volume->vid;
|
||||
return (as->net == as1->net &&
|
||||
as->volume &&
|
||||
as->volume->vid == as1->volume->vid);
|
||||
}
|
||||
|
||||
static int afs_dynroot_test_super(struct super_block *sb, void *data)
|
||||
{
|
||||
return false;
|
||||
}
|
||||
|
||||
static int afs_set_super(struct super_block *sb, void *data)
|
||||
|
|
@ -365,24 +387,30 @@ static int afs_fill_super(struct super_block *sb,
|
|||
sb->s_blocksize_bits = PAGE_SHIFT;
|
||||
sb->s_magic = AFS_FS_MAGIC;
|
||||
sb->s_op = &afs_super_ops;
|
||||
sb->s_xattr = afs_xattr_handlers;
|
||||
if (!as->dyn_root)
|
||||
sb->s_xattr = afs_xattr_handlers;
|
||||
ret = super_setup_bdi(sb);
|
||||
if (ret)
|
||||
return ret;
|
||||
sb->s_bdi->ra_pages = VM_MAX_READAHEAD * 1024 / PAGE_SIZE;
|
||||
sprintf(sb->s_id, "%u", as->volume->vid);
|
||||
|
||||
afs_activate_volume(as->volume);
|
||||
|
||||
/* allocate the root inode and dentry */
|
||||
fid.vid = as->volume->vid;
|
||||
fid.vnode = 1;
|
||||
fid.unique = 1;
|
||||
inode = afs_iget(sb, params->key, &fid, NULL, NULL, NULL);
|
||||
if (as->dyn_root) {
|
||||
inode = afs_iget_pseudo_dir(sb, true);
|
||||
sb->s_flags |= SB_RDONLY;
|
||||
} else {
|
||||
sprintf(sb->s_id, "%u", as->volume->vid);
|
||||
afs_activate_volume(as->volume);
|
||||
fid.vid = as->volume->vid;
|
||||
fid.vnode = 1;
|
||||
fid.unique = 1;
|
||||
inode = afs_iget(sb, params->key, &fid, NULL, NULL, NULL);
|
||||
}
|
||||
|
||||
if (IS_ERR(inode))
|
||||
return PTR_ERR(inode);
|
||||
|
||||
if (params->autocell)
|
||||
if (params->autocell || params->dyn_root)
|
||||
set_bit(AFS_VNODE_AUTOCELL, &AFS_FS_I(inode)->flags);
|
||||
|
||||
ret = -ENOMEM;
|
||||
|
|
@ -407,7 +435,10 @@ static struct afs_super_info *afs_alloc_sbi(struct afs_mount_params *params)
|
|||
as = kzalloc(sizeof(struct afs_super_info), GFP_KERNEL);
|
||||
if (as) {
|
||||
as->net = afs_get_net(params->net);
|
||||
as->cell = afs_get_cell(params->cell);
|
||||
if (params->dyn_root)
|
||||
as->dyn_root = true;
|
||||
else
|
||||
as->cell = afs_get_cell(params->cell);
|
||||
}
|
||||
return as;
|
||||
}
|
||||
|
|
@ -451,18 +482,20 @@ static struct dentry *afs_mount(struct file_system_type *fs_type,
|
|||
goto error;
|
||||
}
|
||||
|
||||
ret = afs_parse_device_name(¶ms, dev_name);
|
||||
if (ret < 0)
|
||||
goto error;
|
||||
if (!params.dyn_root) {
|
||||
ret = afs_parse_device_name(¶ms, dev_name);
|
||||
if (ret < 0)
|
||||
goto error;
|
||||
|
||||
/* 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;
|
||||
/* 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;
|
||||
}
|
||||
params.key = key;
|
||||
|
||||
/* allocate a superblock info record */
|
||||
ret = -ENOMEM;
|
||||
|
|
@ -470,20 +503,25 @@ static struct dentry *afs_mount(struct file_system_type *fs_type,
|
|||
if (!as)
|
||||
goto error_key;
|
||||
|
||||
/* Assume we're going to need a volume record; at the very least we can
|
||||
* use it to update the volume record if we have one already. This
|
||||
* checks that the volume exists within the cell.
|
||||
*/
|
||||
candidate = afs_create_volume(¶ms);
|
||||
if (IS_ERR(candidate)) {
|
||||
ret = PTR_ERR(candidate);
|
||||
goto error_as;
|
||||
if (!params.dyn_root) {
|
||||
/* Assume we're going to need a volume record; at the very
|
||||
* least we can use it to update the volume record if we have
|
||||
* one already. This checks that the volume exists within the
|
||||
* cell.
|
||||
*/
|
||||
candidate = afs_create_volume(¶ms);
|
||||
if (IS_ERR(candidate)) {
|
||||
ret = PTR_ERR(candidate);
|
||||
goto error_as;
|
||||
}
|
||||
|
||||
as->volume = candidate;
|
||||
}
|
||||
|
||||
as->volume = candidate;
|
||||
|
||||
/* allocate a deviceless superblock */
|
||||
sb = sget(fs_type, afs_test_super, afs_set_super, flags, as);
|
||||
sb = sget(fs_type,
|
||||
as->dyn_root ? afs_dynroot_test_super : afs_test_super,
|
||||
afs_set_super, flags, as);
|
||||
if (IS_ERR(sb)) {
|
||||
ret = PTR_ERR(sb);
|
||||
goto error_as;
|
||||
|
|
@ -529,9 +567,11 @@ static void afs_kill_super(struct super_block *sb)
|
|||
/* Clear the callback interests (which will do ilookup5) before
|
||||
* deactivating the superblock.
|
||||
*/
|
||||
afs_clear_callback_interests(as->net, as->volume->servers);
|
||||
if (as->volume)
|
||||
afs_clear_callback_interests(as->net, as->volume->servers);
|
||||
kill_anon_super(sb);
|
||||
afs_deactivate_volume(as->volume);
|
||||
if (as->volume)
|
||||
afs_deactivate_volume(as->volume);
|
||||
afs_destroy_sbi(as);
|
||||
}
|
||||
|
||||
|
|
@ -619,12 +659,24 @@ static void afs_destroy_inode(struct inode *inode)
|
|||
*/
|
||||
static int afs_statfs(struct dentry *dentry, struct kstatfs *buf)
|
||||
{
|
||||
struct afs_super_info *as = AFS_FS_S(dentry->d_sb);
|
||||
struct afs_fs_cursor fc;
|
||||
struct afs_volume_status vs;
|
||||
struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry));
|
||||
struct key *key;
|
||||
int ret;
|
||||
|
||||
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;
|
||||
}
|
||||
|
||||
key = afs_request_key(vnode->volume->cell);
|
||||
if (IS_ERR(key))
|
||||
return PTR_ERR(key);
|
||||
|
|
@ -645,10 +697,6 @@ static int afs_statfs(struct dentry *dentry, struct kstatfs *buf)
|
|||
key_put(key);
|
||||
|
||||
if (ret == 0) {
|
||||
buf->f_type = dentry->d_sb->s_magic;
|
||||
buf->f_bsize = AFS_BLOCK_SIZE;
|
||||
buf->f_namelen = AFSNAMEMAX - 1;
|
||||
|
||||
if (vs.max_quota == 0)
|
||||
buf->f_blocks = vs.part_max_blocks;
|
||||
else
|
||||
|
|
|
|||
|
|
@ -52,11 +52,11 @@
|
|||
* @name: Name to look up
|
||||
* @namelen: Length of name
|
||||
* @options: Request options (or NULL if no options)
|
||||
* @_result: Where to place the returned data.
|
||||
* @_result: Where to place the returned data (or NULL)
|
||||
* @_expiry: Where to store the result expiry time (or NULL)
|
||||
*
|
||||
* The data will be returned in the pointer at *result, and the caller is
|
||||
* responsible for freeing it.
|
||||
* The data will be returned in the pointer at *result, if provided, and the
|
||||
* caller is responsible for freeing it.
|
||||
*
|
||||
* The description should be of the form "[<query_type>:]<domain_name>", and
|
||||
* the options need to be appropriate for the query type requested. If no
|
||||
|
|
@ -81,7 +81,7 @@ int dns_query(const char *type, const char *name, size_t namelen,
|
|||
kenter("%s,%*.*s,%zu,%s",
|
||||
type, (int)namelen, (int)namelen, name, namelen, options);
|
||||
|
||||
if (!name || namelen == 0 || !_result)
|
||||
if (!name || namelen == 0)
|
||||
return -EINVAL;
|
||||
|
||||
/* construct the query key description as "[<type>:]<name>" */
|
||||
|
|
@ -146,13 +146,15 @@ int dns_query(const char *type, const char *name, size_t namelen,
|
|||
upayload = user_key_payload_locked(rkey);
|
||||
len = upayload->datalen;
|
||||
|
||||
ret = -ENOMEM;
|
||||
*_result = kmalloc(len + 1, GFP_KERNEL);
|
||||
if (!*_result)
|
||||
goto put;
|
||||
if (_result) {
|
||||
ret = -ENOMEM;
|
||||
*_result = kmalloc(len + 1, GFP_KERNEL);
|
||||
if (!*_result)
|
||||
goto put;
|
||||
|
||||
memcpy(*_result, upayload->data, len);
|
||||
(*_result)[len] = '\0';
|
||||
memcpy(*_result, upayload->data, len);
|
||||
(*_result)[len] = '\0';
|
||||
}
|
||||
|
||||
if (_expiry)
|
||||
*_expiry = rkey->expiry;
|
||||
|
|
|
|||
Загрузка…
Ссылка в новой задаче