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2169 lines
50 KiB
2169 lines
50 KiB
/* |
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* Copyright (c) 2004 The Regents of the University of Michigan. |
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* Copyright (c) 2012 Jeff Layton <[email protected]> |
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* All rights reserved. |
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* |
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* Andy Adamson <[email protected]> |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* |
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* 1. Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in the |
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* documentation and/or other materials provided with the distribution. |
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* 3. Neither the name of the University nor the names of its |
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* contributors may be used to endorse or promote products derived |
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* from this software without specific prior written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED |
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF |
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
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* DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR |
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* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF |
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING |
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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* |
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*/ |
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|
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#include <crypto/hash.h> |
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#include <linux/file.h> |
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#include <linux/slab.h> |
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#include <linux/namei.h> |
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#include <linux/sched.h> |
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#include <linux/fs.h> |
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#include <linux/module.h> |
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#include <net/net_namespace.h> |
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#include <linux/sunrpc/rpc_pipe_fs.h> |
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#include <linux/sunrpc/clnt.h> |
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#include <linux/nfsd/cld.h> |
|
|
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#include "nfsd.h" |
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#include "state.h" |
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#include "vfs.h" |
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#include "netns.h" |
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|
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#define NFSDDBG_FACILITY NFSDDBG_PROC |
|
|
|
/* Declarations */ |
|
struct nfsd4_client_tracking_ops { |
|
int (*init)(struct net *); |
|
void (*exit)(struct net *); |
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void (*create)(struct nfs4_client *); |
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void (*remove)(struct nfs4_client *); |
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int (*check)(struct nfs4_client *); |
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void (*grace_done)(struct nfsd_net *); |
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uint8_t version; |
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size_t msglen; |
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}; |
|
|
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static const struct nfsd4_client_tracking_ops nfsd4_cld_tracking_ops; |
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static const struct nfsd4_client_tracking_ops nfsd4_cld_tracking_ops_v2; |
|
|
|
/* Globals */ |
|
static char user_recovery_dirname[PATH_MAX] = "/var/lib/nfs/v4recovery"; |
|
|
|
static int |
|
nfs4_save_creds(const struct cred **original_creds) |
|
{ |
|
struct cred *new; |
|
|
|
new = prepare_creds(); |
|
if (!new) |
|
return -ENOMEM; |
|
|
|
new->fsuid = GLOBAL_ROOT_UID; |
|
new->fsgid = GLOBAL_ROOT_GID; |
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*original_creds = override_creds(new); |
|
put_cred(new); |
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return 0; |
|
} |
|
|
|
static void |
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nfs4_reset_creds(const struct cred *original) |
|
{ |
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revert_creds(original); |
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} |
|
|
|
static void |
|
md5_to_hex(char *out, char *md5) |
|
{ |
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int i; |
|
|
|
for (i=0; i<16; i++) { |
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unsigned char c = md5[i]; |
|
|
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*out++ = '0' + ((c&0xf0)>>4) + (c>=0xa0)*('a'-'9'-1); |
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*out++ = '0' + (c&0x0f) + ((c&0x0f)>=0x0a)*('a'-'9'-1); |
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} |
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*out = '\0'; |
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} |
|
|
|
static int |
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nfs4_make_rec_clidname(char *dname, const struct xdr_netobj *clname) |
|
{ |
|
struct xdr_netobj cksum; |
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struct crypto_shash *tfm; |
|
int status; |
|
|
|
dprintk("NFSD: nfs4_make_rec_clidname for %.*s\n", |
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clname->len, clname->data); |
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tfm = crypto_alloc_shash("md5", 0, 0); |
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if (IS_ERR(tfm)) { |
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status = PTR_ERR(tfm); |
|
goto out_no_tfm; |
|
} |
|
|
|
cksum.len = crypto_shash_digestsize(tfm); |
|
cksum.data = kmalloc(cksum.len, GFP_KERNEL); |
|
if (cksum.data == NULL) { |
|
status = -ENOMEM; |
|
goto out; |
|
} |
|
|
|
status = crypto_shash_tfm_digest(tfm, clname->data, clname->len, |
|
cksum.data); |
|
if (status) |
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goto out; |
|
|
|
md5_to_hex(dname, cksum.data); |
|
|
|
status = 0; |
|
out: |
|
kfree(cksum.data); |
|
crypto_free_shash(tfm); |
|
out_no_tfm: |
|
return status; |
|
} |
|
|
|
/* |
|
* If we had an error generating the recdir name for the legacy tracker |
|
* then warn the admin. If the error doesn't appear to be transient, |
|
* then disable recovery tracking. |
|
*/ |
|
static void |
|
legacy_recdir_name_error(struct nfs4_client *clp, int error) |
|
{ |
|
printk(KERN_ERR "NFSD: unable to generate recoverydir " |
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"name (%d).\n", error); |
|
|
|
/* |
|
* if the algorithm just doesn't exist, then disable the recovery |
|
* tracker altogether. The crypto libs will generally return this if |
|
* FIPS is enabled as well. |
|
*/ |
|
if (error == -ENOENT) { |
|
printk(KERN_ERR "NFSD: disabling legacy clientid tracking. " |
|
"Reboot recovery will not function correctly!\n"); |
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nfsd4_client_tracking_exit(clp->net); |
|
} |
|
} |
|
|
|
static void |
|
__nfsd4_create_reclaim_record_grace(struct nfs4_client *clp, |
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const char *dname, int len, struct nfsd_net *nn) |
|
{ |
|
struct xdr_netobj name; |
|
struct xdr_netobj princhash = { .len = 0, .data = NULL }; |
|
struct nfs4_client_reclaim *crp; |
|
|
|
name.data = kmemdup(dname, len, GFP_KERNEL); |
|
if (!name.data) { |
|
dprintk("%s: failed to allocate memory for name.data!\n", |
|
__func__); |
|
return; |
|
} |
|
name.len = len; |
|
crp = nfs4_client_to_reclaim(name, princhash, nn); |
|
if (!crp) { |
|
kfree(name.data); |
|
return; |
|
} |
|
crp->cr_clp = clp; |
|
} |
|
|
|
static void |
|
nfsd4_create_clid_dir(struct nfs4_client *clp) |
|
{ |
|
const struct cred *original_cred; |
|
char dname[HEXDIR_LEN]; |
|
struct dentry *dir, *dentry; |
|
int status; |
|
struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id); |
|
|
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if (test_and_set_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags)) |
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return; |
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if (!nn->rec_file) |
|
return; |
|
|
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status = nfs4_make_rec_clidname(dname, &clp->cl_name); |
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if (status) |
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return legacy_recdir_name_error(clp, status); |
|
|
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status = nfs4_save_creds(&original_cred); |
|
if (status < 0) |
|
return; |
|
|
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status = mnt_want_write_file(nn->rec_file); |
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if (status) |
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goto out_creds; |
|
|
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dir = nn->rec_file->f_path.dentry; |
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/* lock the parent */ |
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inode_lock(d_inode(dir)); |
|
|
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dentry = lookup_one_len(dname, dir, HEXDIR_LEN-1); |
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if (IS_ERR(dentry)) { |
|
status = PTR_ERR(dentry); |
|
goto out_unlock; |
|
} |
|
if (d_really_is_positive(dentry)) |
|
/* |
|
* In the 4.1 case, where we're called from |
|
* reclaim_complete(), records from the previous reboot |
|
* may still be left, so this is OK. |
|
* |
|
* In the 4.0 case, we should never get here; but we may |
|
* as well be forgiving and just succeed silently. |
|
*/ |
|
goto out_put; |
|
status = vfs_mkdir(&init_user_ns, d_inode(dir), dentry, S_IRWXU); |
|
out_put: |
|
dput(dentry); |
|
out_unlock: |
|
inode_unlock(d_inode(dir)); |
|
if (status == 0) { |
|
if (nn->in_grace) |
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__nfsd4_create_reclaim_record_grace(clp, dname, |
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HEXDIR_LEN, nn); |
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vfs_fsync(nn->rec_file, 0); |
|
} else { |
|
printk(KERN_ERR "NFSD: failed to write recovery record" |
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" (err %d); please check that %s exists" |
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" and is writeable", status, |
|
user_recovery_dirname); |
|
} |
|
mnt_drop_write_file(nn->rec_file); |
|
out_creds: |
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nfs4_reset_creds(original_cred); |
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} |
|
|
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typedef int (recdir_func)(struct dentry *, struct dentry *, struct nfsd_net *); |
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|
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struct name_list { |
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char name[HEXDIR_LEN]; |
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struct list_head list; |
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}; |
|
|
|
struct nfs4_dir_ctx { |
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struct dir_context ctx; |
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struct list_head names; |
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}; |
|
|
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static bool |
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nfsd4_build_namelist(struct dir_context *__ctx, const char *name, int namlen, |
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loff_t offset, u64 ino, unsigned int d_type) |
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{ |
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struct nfs4_dir_ctx *ctx = |
|
container_of(__ctx, struct nfs4_dir_ctx, ctx); |
|
struct name_list *entry; |
|
|
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if (namlen != HEXDIR_LEN - 1) |
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return true; |
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entry = kmalloc(sizeof(struct name_list), GFP_KERNEL); |
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if (entry == NULL) |
|
return false; |
|
memcpy(entry->name, name, HEXDIR_LEN - 1); |
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entry->name[HEXDIR_LEN - 1] = '\0'; |
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list_add(&entry->list, &ctx->names); |
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return true; |
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} |
|
|
|
static int |
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nfsd4_list_rec_dir(recdir_func *f, struct nfsd_net *nn) |
|
{ |
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const struct cred *original_cred; |
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struct dentry *dir = nn->rec_file->f_path.dentry; |
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struct nfs4_dir_ctx ctx = { |
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.ctx.actor = nfsd4_build_namelist, |
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.names = LIST_HEAD_INIT(ctx.names) |
|
}; |
|
struct name_list *entry, *tmp; |
|
int status; |
|
|
|
status = nfs4_save_creds(&original_cred); |
|
if (status < 0) |
|
return status; |
|
|
|
status = vfs_llseek(nn->rec_file, 0, SEEK_SET); |
|
if (status < 0) { |
|
nfs4_reset_creds(original_cred); |
|
return status; |
|
} |
|
|
|
status = iterate_dir(nn->rec_file, &ctx.ctx); |
|
inode_lock_nested(d_inode(dir), I_MUTEX_PARENT); |
|
|
|
list_for_each_entry_safe(entry, tmp, &ctx.names, list) { |
|
if (!status) { |
|
struct dentry *dentry; |
|
dentry = lookup_one_len(entry->name, dir, HEXDIR_LEN-1); |
|
if (IS_ERR(dentry)) { |
|
status = PTR_ERR(dentry); |
|
break; |
|
} |
|
status = f(dir, dentry, nn); |
|
dput(dentry); |
|
} |
|
list_del(&entry->list); |
|
kfree(entry); |
|
} |
|
inode_unlock(d_inode(dir)); |
|
nfs4_reset_creds(original_cred); |
|
|
|
list_for_each_entry_safe(entry, tmp, &ctx.names, list) { |
|
dprintk("NFSD: %s. Left entry %s\n", __func__, entry->name); |
|
list_del(&entry->list); |
|
kfree(entry); |
|
} |
|
return status; |
|
} |
|
|
|
static int |
|
nfsd4_unlink_clid_dir(char *name, int namlen, struct nfsd_net *nn) |
|
{ |
|
struct dentry *dir, *dentry; |
|
int status; |
|
|
|
dprintk("NFSD: nfsd4_unlink_clid_dir. name %.*s\n", namlen, name); |
|
|
|
dir = nn->rec_file->f_path.dentry; |
|
inode_lock_nested(d_inode(dir), I_MUTEX_PARENT); |
|
dentry = lookup_one_len(name, dir, namlen); |
|
if (IS_ERR(dentry)) { |
|
status = PTR_ERR(dentry); |
|
goto out_unlock; |
|
} |
|
status = -ENOENT; |
|
if (d_really_is_negative(dentry)) |
|
goto out; |
|
status = vfs_rmdir(&init_user_ns, d_inode(dir), dentry); |
|
out: |
|
dput(dentry); |
|
out_unlock: |
|
inode_unlock(d_inode(dir)); |
|
return status; |
|
} |
|
|
|
static void |
|
__nfsd4_remove_reclaim_record_grace(const char *dname, int len, |
|
struct nfsd_net *nn) |
|
{ |
|
struct xdr_netobj name; |
|
struct nfs4_client_reclaim *crp; |
|
|
|
name.data = kmemdup(dname, len, GFP_KERNEL); |
|
if (!name.data) { |
|
dprintk("%s: failed to allocate memory for name.data!\n", |
|
__func__); |
|
return; |
|
} |
|
name.len = len; |
|
crp = nfsd4_find_reclaim_client(name, nn); |
|
kfree(name.data); |
|
if (crp) |
|
nfs4_remove_reclaim_record(crp, nn); |
|
} |
|
|
|
static void |
|
nfsd4_remove_clid_dir(struct nfs4_client *clp) |
|
{ |
|
const struct cred *original_cred; |
|
char dname[HEXDIR_LEN]; |
|
int status; |
|
struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id); |
|
|
|
if (!nn->rec_file || !test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags)) |
|
return; |
|
|
|
status = nfs4_make_rec_clidname(dname, &clp->cl_name); |
|
if (status) |
|
return legacy_recdir_name_error(clp, status); |
|
|
|
status = mnt_want_write_file(nn->rec_file); |
|
if (status) |
|
goto out; |
|
clear_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags); |
|
|
|
status = nfs4_save_creds(&original_cred); |
|
if (status < 0) |
|
goto out_drop_write; |
|
|
|
status = nfsd4_unlink_clid_dir(dname, HEXDIR_LEN-1, nn); |
|
nfs4_reset_creds(original_cred); |
|
if (status == 0) { |
|
vfs_fsync(nn->rec_file, 0); |
|
if (nn->in_grace) |
|
__nfsd4_remove_reclaim_record_grace(dname, |
|
HEXDIR_LEN, nn); |
|
} |
|
out_drop_write: |
|
mnt_drop_write_file(nn->rec_file); |
|
out: |
|
if (status) |
|
printk("NFSD: Failed to remove expired client state directory" |
|
" %.*s\n", HEXDIR_LEN, dname); |
|
} |
|
|
|
static int |
|
purge_old(struct dentry *parent, struct dentry *child, struct nfsd_net *nn) |
|
{ |
|
int status; |
|
struct xdr_netobj name; |
|
|
|
if (child->d_name.len != HEXDIR_LEN - 1) { |
|
printk("%s: illegal name %pd in recovery directory\n", |
|
__func__, child); |
|
/* Keep trying; maybe the others are OK: */ |
|
return 0; |
|
} |
|
name.data = kmemdup_nul(child->d_name.name, child->d_name.len, GFP_KERNEL); |
|
if (!name.data) { |
|
dprintk("%s: failed to allocate memory for name.data!\n", |
|
__func__); |
|
goto out; |
|
} |
|
name.len = HEXDIR_LEN; |
|
if (nfs4_has_reclaimed_state(name, nn)) |
|
goto out_free; |
|
|
|
status = vfs_rmdir(&init_user_ns, d_inode(parent), child); |
|
if (status) |
|
printk("failed to remove client recovery directory %pd\n", |
|
child); |
|
out_free: |
|
kfree(name.data); |
|
out: |
|
/* Keep trying, success or failure: */ |
|
return 0; |
|
} |
|
|
|
static void |
|
nfsd4_recdir_purge_old(struct nfsd_net *nn) |
|
{ |
|
int status; |
|
|
|
nn->in_grace = false; |
|
if (!nn->rec_file) |
|
return; |
|
status = mnt_want_write_file(nn->rec_file); |
|
if (status) |
|
goto out; |
|
status = nfsd4_list_rec_dir(purge_old, nn); |
|
if (status == 0) |
|
vfs_fsync(nn->rec_file, 0); |
|
mnt_drop_write_file(nn->rec_file); |
|
out: |
|
nfs4_release_reclaim(nn); |
|
if (status) |
|
printk("nfsd4: failed to purge old clients from recovery" |
|
" directory %pD\n", nn->rec_file); |
|
} |
|
|
|
static int |
|
load_recdir(struct dentry *parent, struct dentry *child, struct nfsd_net *nn) |
|
{ |
|
struct xdr_netobj name; |
|
struct xdr_netobj princhash = { .len = 0, .data = NULL }; |
|
|
|
if (child->d_name.len != HEXDIR_LEN - 1) { |
|
printk("%s: illegal name %pd in recovery directory\n", |
|
__func__, child); |
|
/* Keep trying; maybe the others are OK: */ |
|
return 0; |
|
} |
|
name.data = kmemdup_nul(child->d_name.name, child->d_name.len, GFP_KERNEL); |
|
if (!name.data) { |
|
dprintk("%s: failed to allocate memory for name.data!\n", |
|
__func__); |
|
goto out; |
|
} |
|
name.len = HEXDIR_LEN; |
|
if (!nfs4_client_to_reclaim(name, princhash, nn)) |
|
kfree(name.data); |
|
out: |
|
return 0; |
|
} |
|
|
|
static int |
|
nfsd4_recdir_load(struct net *net) { |
|
int status; |
|
struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
|
|
|
if (!nn->rec_file) |
|
return 0; |
|
|
|
status = nfsd4_list_rec_dir(load_recdir, nn); |
|
if (status) |
|
printk("nfsd4: failed loading clients from recovery" |
|
" directory %pD\n", nn->rec_file); |
|
return status; |
|
} |
|
|
|
/* |
|
* Hold reference to the recovery directory. |
|
*/ |
|
|
|
static int |
|
nfsd4_init_recdir(struct net *net) |
|
{ |
|
struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
|
const struct cred *original_cred; |
|
int status; |
|
|
|
printk("NFSD: Using %s as the NFSv4 state recovery directory\n", |
|
user_recovery_dirname); |
|
|
|
BUG_ON(nn->rec_file); |
|
|
|
status = nfs4_save_creds(&original_cred); |
|
if (status < 0) { |
|
printk("NFSD: Unable to change credentials to find recovery" |
|
" directory: error %d\n", |
|
status); |
|
return status; |
|
} |
|
|
|
nn->rec_file = filp_open(user_recovery_dirname, O_RDONLY | O_DIRECTORY, 0); |
|
if (IS_ERR(nn->rec_file)) { |
|
printk("NFSD: unable to find recovery directory %s\n", |
|
user_recovery_dirname); |
|
status = PTR_ERR(nn->rec_file); |
|
nn->rec_file = NULL; |
|
} |
|
|
|
nfs4_reset_creds(original_cred); |
|
if (!status) |
|
nn->in_grace = true; |
|
return status; |
|
} |
|
|
|
static void |
|
nfsd4_shutdown_recdir(struct net *net) |
|
{ |
|
struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
|
|
|
if (!nn->rec_file) |
|
return; |
|
fput(nn->rec_file); |
|
nn->rec_file = NULL; |
|
} |
|
|
|
static int |
|
nfs4_legacy_state_init(struct net *net) |
|
{ |
|
struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
|
int i; |
|
|
|
nn->reclaim_str_hashtbl = kmalloc_array(CLIENT_HASH_SIZE, |
|
sizeof(struct list_head), |
|
GFP_KERNEL); |
|
if (!nn->reclaim_str_hashtbl) |
|
return -ENOMEM; |
|
|
|
for (i = 0; i < CLIENT_HASH_SIZE; i++) |
|
INIT_LIST_HEAD(&nn->reclaim_str_hashtbl[i]); |
|
nn->reclaim_str_hashtbl_size = 0; |
|
|
|
return 0; |
|
} |
|
|
|
static void |
|
nfs4_legacy_state_shutdown(struct net *net) |
|
{ |
|
struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
|
|
|
kfree(nn->reclaim_str_hashtbl); |
|
} |
|
|
|
static int |
|
nfsd4_load_reboot_recovery_data(struct net *net) |
|
{ |
|
int status; |
|
|
|
status = nfsd4_init_recdir(net); |
|
if (status) |
|
return status; |
|
|
|
status = nfsd4_recdir_load(net); |
|
if (status) |
|
nfsd4_shutdown_recdir(net); |
|
|
|
return status; |
|
} |
|
|
|
static int |
|
nfsd4_legacy_tracking_init(struct net *net) |
|
{ |
|
int status; |
|
|
|
/* XXX: The legacy code won't work in a container */ |
|
if (net != &init_net) { |
|
pr_warn("NFSD: attempt to initialize legacy client tracking in a container ignored.\n"); |
|
return -EINVAL; |
|
} |
|
|
|
status = nfs4_legacy_state_init(net); |
|
if (status) |
|
return status; |
|
|
|
status = nfsd4_load_reboot_recovery_data(net); |
|
if (status) |
|
goto err; |
|
pr_info("NFSD: Using legacy client tracking operations.\n"); |
|
return 0; |
|
|
|
err: |
|
nfs4_legacy_state_shutdown(net); |
|
return status; |
|
} |
|
|
|
static void |
|
nfsd4_legacy_tracking_exit(struct net *net) |
|
{ |
|
struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
|
|
|
nfs4_release_reclaim(nn); |
|
nfsd4_shutdown_recdir(net); |
|
nfs4_legacy_state_shutdown(net); |
|
} |
|
|
|
/* |
|
* Change the NFSv4 recovery directory to recdir. |
|
*/ |
|
int |
|
nfs4_reset_recoverydir(char *recdir) |
|
{ |
|
int status; |
|
struct path path; |
|
|
|
status = kern_path(recdir, LOOKUP_FOLLOW, &path); |
|
if (status) |
|
return status; |
|
status = -ENOTDIR; |
|
if (d_is_dir(path.dentry)) { |
|
strcpy(user_recovery_dirname, recdir); |
|
status = 0; |
|
} |
|
path_put(&path); |
|
return status; |
|
} |
|
|
|
char * |
|
nfs4_recoverydir(void) |
|
{ |
|
return user_recovery_dirname; |
|
} |
|
|
|
static int |
|
nfsd4_check_legacy_client(struct nfs4_client *clp) |
|
{ |
|
int status; |
|
char dname[HEXDIR_LEN]; |
|
struct nfs4_client_reclaim *crp; |
|
struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id); |
|
struct xdr_netobj name; |
|
|
|
/* did we already find that this client is stable? */ |
|
if (test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags)) |
|
return 0; |
|
|
|
status = nfs4_make_rec_clidname(dname, &clp->cl_name); |
|
if (status) { |
|
legacy_recdir_name_error(clp, status); |
|
return status; |
|
} |
|
|
|
/* look for it in the reclaim hashtable otherwise */ |
|
name.data = kmemdup(dname, HEXDIR_LEN, GFP_KERNEL); |
|
if (!name.data) { |
|
dprintk("%s: failed to allocate memory for name.data!\n", |
|
__func__); |
|
goto out_enoent; |
|
} |
|
name.len = HEXDIR_LEN; |
|
crp = nfsd4_find_reclaim_client(name, nn); |
|
kfree(name.data); |
|
if (crp) { |
|
set_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags); |
|
crp->cr_clp = clp; |
|
return 0; |
|
} |
|
|
|
out_enoent: |
|
return -ENOENT; |
|
} |
|
|
|
static const struct nfsd4_client_tracking_ops nfsd4_legacy_tracking_ops = { |
|
.init = nfsd4_legacy_tracking_init, |
|
.exit = nfsd4_legacy_tracking_exit, |
|
.create = nfsd4_create_clid_dir, |
|
.remove = nfsd4_remove_clid_dir, |
|
.check = nfsd4_check_legacy_client, |
|
.grace_done = nfsd4_recdir_purge_old, |
|
.version = 1, |
|
.msglen = 0, |
|
}; |
|
|
|
/* Globals */ |
|
#define NFSD_PIPE_DIR "nfsd" |
|
#define NFSD_CLD_PIPE "cld" |
|
|
|
/* per-net-ns structure for holding cld upcall info */ |
|
struct cld_net { |
|
struct rpc_pipe *cn_pipe; |
|
spinlock_t cn_lock; |
|
struct list_head cn_list; |
|
unsigned int cn_xid; |
|
bool cn_has_legacy; |
|
struct crypto_shash *cn_tfm; |
|
}; |
|
|
|
struct cld_upcall { |
|
struct list_head cu_list; |
|
struct cld_net *cu_net; |
|
struct completion cu_done; |
|
union { |
|
struct cld_msg_hdr cu_hdr; |
|
struct cld_msg cu_msg; |
|
struct cld_msg_v2 cu_msg_v2; |
|
} cu_u; |
|
}; |
|
|
|
static int |
|
__cld_pipe_upcall(struct rpc_pipe *pipe, void *cmsg, struct nfsd_net *nn) |
|
{ |
|
int ret; |
|
struct rpc_pipe_msg msg; |
|
struct cld_upcall *cup = container_of(cmsg, struct cld_upcall, cu_u); |
|
|
|
memset(&msg, 0, sizeof(msg)); |
|
msg.data = cmsg; |
|
msg.len = nn->client_tracking_ops->msglen; |
|
|
|
ret = rpc_queue_upcall(pipe, &msg); |
|
if (ret < 0) { |
|
goto out; |
|
} |
|
|
|
wait_for_completion(&cup->cu_done); |
|
|
|
if (msg.errno < 0) |
|
ret = msg.errno; |
|
out: |
|
return ret; |
|
} |
|
|
|
static int |
|
cld_pipe_upcall(struct rpc_pipe *pipe, void *cmsg, struct nfsd_net *nn) |
|
{ |
|
int ret; |
|
|
|
/* |
|
* -EAGAIN occurs when pipe is closed and reopened while there are |
|
* upcalls queued. |
|
*/ |
|
do { |
|
ret = __cld_pipe_upcall(pipe, cmsg, nn); |
|
} while (ret == -EAGAIN); |
|
|
|
return ret; |
|
} |
|
|
|
static ssize_t |
|
__cld_pipe_inprogress_downcall(const struct cld_msg_v2 __user *cmsg, |
|
struct nfsd_net *nn) |
|
{ |
|
uint8_t cmd, princhashlen; |
|
struct xdr_netobj name, princhash = { .len = 0, .data = NULL }; |
|
uint16_t namelen; |
|
struct cld_net *cn = nn->cld_net; |
|
|
|
if (get_user(cmd, &cmsg->cm_cmd)) { |
|
dprintk("%s: error when copying cmd from userspace", __func__); |
|
return -EFAULT; |
|
} |
|
if (cmd == Cld_GraceStart) { |
|
if (nn->client_tracking_ops->version >= 2) { |
|
const struct cld_clntinfo __user *ci; |
|
|
|
ci = &cmsg->cm_u.cm_clntinfo; |
|
if (get_user(namelen, &ci->cc_name.cn_len)) |
|
return -EFAULT; |
|
name.data = memdup_user(&ci->cc_name.cn_id, namelen); |
|
if (IS_ERR(name.data)) |
|
return PTR_ERR(name.data); |
|
name.len = namelen; |
|
get_user(princhashlen, &ci->cc_princhash.cp_len); |
|
if (princhashlen > 0) { |
|
princhash.data = memdup_user( |
|
&ci->cc_princhash.cp_data, |
|
princhashlen); |
|
if (IS_ERR(princhash.data)) { |
|
kfree(name.data); |
|
return PTR_ERR(princhash.data); |
|
} |
|
princhash.len = princhashlen; |
|
} else |
|
princhash.len = 0; |
|
} else { |
|
const struct cld_name __user *cnm; |
|
|
|
cnm = &cmsg->cm_u.cm_name; |
|
if (get_user(namelen, &cnm->cn_len)) |
|
return -EFAULT; |
|
name.data = memdup_user(&cnm->cn_id, namelen); |
|
if (IS_ERR(name.data)) |
|
return PTR_ERR(name.data); |
|
name.len = namelen; |
|
} |
|
if (name.len > 5 && memcmp(name.data, "hash:", 5) == 0) { |
|
name.len = name.len - 5; |
|
memmove(name.data, name.data + 5, name.len); |
|
cn->cn_has_legacy = true; |
|
} |
|
if (!nfs4_client_to_reclaim(name, princhash, nn)) { |
|
kfree(name.data); |
|
kfree(princhash.data); |
|
return -EFAULT; |
|
} |
|
return nn->client_tracking_ops->msglen; |
|
} |
|
return -EFAULT; |
|
} |
|
|
|
static ssize_t |
|
cld_pipe_downcall(struct file *filp, const char __user *src, size_t mlen) |
|
{ |
|
struct cld_upcall *tmp, *cup; |
|
struct cld_msg_hdr __user *hdr = (struct cld_msg_hdr __user *)src; |
|
struct cld_msg_v2 __user *cmsg = (struct cld_msg_v2 __user *)src; |
|
uint32_t xid; |
|
struct nfsd_net *nn = net_generic(file_inode(filp)->i_sb->s_fs_info, |
|
nfsd_net_id); |
|
struct cld_net *cn = nn->cld_net; |
|
int16_t status; |
|
|
|
if (mlen != nn->client_tracking_ops->msglen) { |
|
dprintk("%s: got %zu bytes, expected %zu\n", __func__, mlen, |
|
nn->client_tracking_ops->msglen); |
|
return -EINVAL; |
|
} |
|
|
|
/* copy just the xid so we can try to find that */ |
|
if (copy_from_user(&xid, &hdr->cm_xid, sizeof(xid)) != 0) { |
|
dprintk("%s: error when copying xid from userspace", __func__); |
|
return -EFAULT; |
|
} |
|
|
|
/* |
|
* copy the status so we know whether to remove the upcall from the |
|
* list (for -EINPROGRESS, we just want to make sure the xid is |
|
* valid, not remove the upcall from the list) |
|
*/ |
|
if (get_user(status, &hdr->cm_status)) { |
|
dprintk("%s: error when copying status from userspace", __func__); |
|
return -EFAULT; |
|
} |
|
|
|
/* walk the list and find corresponding xid */ |
|
cup = NULL; |
|
spin_lock(&cn->cn_lock); |
|
list_for_each_entry(tmp, &cn->cn_list, cu_list) { |
|
if (get_unaligned(&tmp->cu_u.cu_hdr.cm_xid) == xid) { |
|
cup = tmp; |
|
if (status != -EINPROGRESS) |
|
list_del_init(&cup->cu_list); |
|
break; |
|
} |
|
} |
|
spin_unlock(&cn->cn_lock); |
|
|
|
/* couldn't find upcall? */ |
|
if (!cup) { |
|
dprintk("%s: couldn't find upcall -- xid=%u\n", __func__, xid); |
|
return -EINVAL; |
|
} |
|
|
|
if (status == -EINPROGRESS) |
|
return __cld_pipe_inprogress_downcall(cmsg, nn); |
|
|
|
if (copy_from_user(&cup->cu_u.cu_msg_v2, src, mlen) != 0) |
|
return -EFAULT; |
|
|
|
complete(&cup->cu_done); |
|
return mlen; |
|
} |
|
|
|
static void |
|
cld_pipe_destroy_msg(struct rpc_pipe_msg *msg) |
|
{ |
|
struct cld_msg *cmsg = msg->data; |
|
struct cld_upcall *cup = container_of(cmsg, struct cld_upcall, |
|
cu_u.cu_msg); |
|
|
|
/* errno >= 0 means we got a downcall */ |
|
if (msg->errno >= 0) |
|
return; |
|
|
|
complete(&cup->cu_done); |
|
} |
|
|
|
static const struct rpc_pipe_ops cld_upcall_ops = { |
|
.upcall = rpc_pipe_generic_upcall, |
|
.downcall = cld_pipe_downcall, |
|
.destroy_msg = cld_pipe_destroy_msg, |
|
}; |
|
|
|
static struct dentry * |
|
nfsd4_cld_register_sb(struct super_block *sb, struct rpc_pipe *pipe) |
|
{ |
|
struct dentry *dir, *dentry; |
|
|
|
dir = rpc_d_lookup_sb(sb, NFSD_PIPE_DIR); |
|
if (dir == NULL) |
|
return ERR_PTR(-ENOENT); |
|
dentry = rpc_mkpipe_dentry(dir, NFSD_CLD_PIPE, NULL, pipe); |
|
dput(dir); |
|
return dentry; |
|
} |
|
|
|
static void |
|
nfsd4_cld_unregister_sb(struct rpc_pipe *pipe) |
|
{ |
|
if (pipe->dentry) |
|
rpc_unlink(pipe->dentry); |
|
} |
|
|
|
static struct dentry * |
|
nfsd4_cld_register_net(struct net *net, struct rpc_pipe *pipe) |
|
{ |
|
struct super_block *sb; |
|
struct dentry *dentry; |
|
|
|
sb = rpc_get_sb_net(net); |
|
if (!sb) |
|
return NULL; |
|
dentry = nfsd4_cld_register_sb(sb, pipe); |
|
rpc_put_sb_net(net); |
|
return dentry; |
|
} |
|
|
|
static void |
|
nfsd4_cld_unregister_net(struct net *net, struct rpc_pipe *pipe) |
|
{ |
|
struct super_block *sb; |
|
|
|
sb = rpc_get_sb_net(net); |
|
if (sb) { |
|
nfsd4_cld_unregister_sb(pipe); |
|
rpc_put_sb_net(net); |
|
} |
|
} |
|
|
|
/* Initialize rpc_pipefs pipe for communication with client tracking daemon */ |
|
static int |
|
__nfsd4_init_cld_pipe(struct net *net) |
|
{ |
|
int ret; |
|
struct dentry *dentry; |
|
struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
|
struct cld_net *cn; |
|
|
|
if (nn->cld_net) |
|
return 0; |
|
|
|
cn = kzalloc(sizeof(*cn), GFP_KERNEL); |
|
if (!cn) { |
|
ret = -ENOMEM; |
|
goto err; |
|
} |
|
|
|
cn->cn_pipe = rpc_mkpipe_data(&cld_upcall_ops, RPC_PIPE_WAIT_FOR_OPEN); |
|
if (IS_ERR(cn->cn_pipe)) { |
|
ret = PTR_ERR(cn->cn_pipe); |
|
goto err; |
|
} |
|
spin_lock_init(&cn->cn_lock); |
|
INIT_LIST_HEAD(&cn->cn_list); |
|
|
|
dentry = nfsd4_cld_register_net(net, cn->cn_pipe); |
|
if (IS_ERR(dentry)) { |
|
ret = PTR_ERR(dentry); |
|
goto err_destroy_data; |
|
} |
|
|
|
cn->cn_pipe->dentry = dentry; |
|
cn->cn_has_legacy = false; |
|
nn->cld_net = cn; |
|
return 0; |
|
|
|
err_destroy_data: |
|
rpc_destroy_pipe_data(cn->cn_pipe); |
|
err: |
|
kfree(cn); |
|
printk(KERN_ERR "NFSD: unable to create nfsdcld upcall pipe (%d)\n", |
|
ret); |
|
return ret; |
|
} |
|
|
|
static int |
|
nfsd4_init_cld_pipe(struct net *net) |
|
{ |
|
int status; |
|
|
|
status = __nfsd4_init_cld_pipe(net); |
|
if (!status) |
|
pr_info("NFSD: Using old nfsdcld client tracking operations.\n"); |
|
return status; |
|
} |
|
|
|
static void |
|
nfsd4_remove_cld_pipe(struct net *net) |
|
{ |
|
struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
|
struct cld_net *cn = nn->cld_net; |
|
|
|
nfsd4_cld_unregister_net(net, cn->cn_pipe); |
|
rpc_destroy_pipe_data(cn->cn_pipe); |
|
if (cn->cn_tfm) |
|
crypto_free_shash(cn->cn_tfm); |
|
kfree(nn->cld_net); |
|
nn->cld_net = NULL; |
|
} |
|
|
|
static struct cld_upcall * |
|
alloc_cld_upcall(struct nfsd_net *nn) |
|
{ |
|
struct cld_upcall *new, *tmp; |
|
struct cld_net *cn = nn->cld_net; |
|
|
|
new = kzalloc(sizeof(*new), GFP_KERNEL); |
|
if (!new) |
|
return new; |
|
|
|
/* FIXME: hard cap on number in flight? */ |
|
restart_search: |
|
spin_lock(&cn->cn_lock); |
|
list_for_each_entry(tmp, &cn->cn_list, cu_list) { |
|
if (tmp->cu_u.cu_msg.cm_xid == cn->cn_xid) { |
|
cn->cn_xid++; |
|
spin_unlock(&cn->cn_lock); |
|
goto restart_search; |
|
} |
|
} |
|
init_completion(&new->cu_done); |
|
new->cu_u.cu_msg.cm_vers = nn->client_tracking_ops->version; |
|
put_unaligned(cn->cn_xid++, &new->cu_u.cu_msg.cm_xid); |
|
new->cu_net = cn; |
|
list_add(&new->cu_list, &cn->cn_list); |
|
spin_unlock(&cn->cn_lock); |
|
|
|
dprintk("%s: allocated xid %u\n", __func__, new->cu_u.cu_msg.cm_xid); |
|
|
|
return new; |
|
} |
|
|
|
static void |
|
free_cld_upcall(struct cld_upcall *victim) |
|
{ |
|
struct cld_net *cn = victim->cu_net; |
|
|
|
spin_lock(&cn->cn_lock); |
|
list_del(&victim->cu_list); |
|
spin_unlock(&cn->cn_lock); |
|
kfree(victim); |
|
} |
|
|
|
/* Ask daemon to create a new record */ |
|
static void |
|
nfsd4_cld_create(struct nfs4_client *clp) |
|
{ |
|
int ret; |
|
struct cld_upcall *cup; |
|
struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id); |
|
struct cld_net *cn = nn->cld_net; |
|
|
|
/* Don't upcall if it's already stored */ |
|
if (test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags)) |
|
return; |
|
|
|
cup = alloc_cld_upcall(nn); |
|
if (!cup) { |
|
ret = -ENOMEM; |
|
goto out_err; |
|
} |
|
|
|
cup->cu_u.cu_msg.cm_cmd = Cld_Create; |
|
cup->cu_u.cu_msg.cm_u.cm_name.cn_len = clp->cl_name.len; |
|
memcpy(cup->cu_u.cu_msg.cm_u.cm_name.cn_id, clp->cl_name.data, |
|
clp->cl_name.len); |
|
|
|
ret = cld_pipe_upcall(cn->cn_pipe, &cup->cu_u.cu_msg, nn); |
|
if (!ret) { |
|
ret = cup->cu_u.cu_msg.cm_status; |
|
set_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags); |
|
} |
|
|
|
free_cld_upcall(cup); |
|
out_err: |
|
if (ret) |
|
printk(KERN_ERR "NFSD: Unable to create client " |
|
"record on stable storage: %d\n", ret); |
|
} |
|
|
|
/* Ask daemon to create a new record */ |
|
static void |
|
nfsd4_cld_create_v2(struct nfs4_client *clp) |
|
{ |
|
int ret; |
|
struct cld_upcall *cup; |
|
struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id); |
|
struct cld_net *cn = nn->cld_net; |
|
struct cld_msg_v2 *cmsg; |
|
struct crypto_shash *tfm = cn->cn_tfm; |
|
struct xdr_netobj cksum; |
|
char *principal = NULL; |
|
|
|
/* Don't upcall if it's already stored */ |
|
if (test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags)) |
|
return; |
|
|
|
cup = alloc_cld_upcall(nn); |
|
if (!cup) { |
|
ret = -ENOMEM; |
|
goto out_err; |
|
} |
|
|
|
cmsg = &cup->cu_u.cu_msg_v2; |
|
cmsg->cm_cmd = Cld_Create; |
|
cmsg->cm_u.cm_clntinfo.cc_name.cn_len = clp->cl_name.len; |
|
memcpy(cmsg->cm_u.cm_clntinfo.cc_name.cn_id, clp->cl_name.data, |
|
clp->cl_name.len); |
|
if (clp->cl_cred.cr_raw_principal) |
|
principal = clp->cl_cred.cr_raw_principal; |
|
else if (clp->cl_cred.cr_principal) |
|
principal = clp->cl_cred.cr_principal; |
|
if (principal) { |
|
cksum.len = crypto_shash_digestsize(tfm); |
|
cksum.data = kmalloc(cksum.len, GFP_KERNEL); |
|
if (cksum.data == NULL) { |
|
ret = -ENOMEM; |
|
goto out; |
|
} |
|
ret = crypto_shash_tfm_digest(tfm, principal, strlen(principal), |
|
cksum.data); |
|
if (ret) { |
|
kfree(cksum.data); |
|
goto out; |
|
} |
|
cmsg->cm_u.cm_clntinfo.cc_princhash.cp_len = cksum.len; |
|
memcpy(cmsg->cm_u.cm_clntinfo.cc_princhash.cp_data, |
|
cksum.data, cksum.len); |
|
kfree(cksum.data); |
|
} else |
|
cmsg->cm_u.cm_clntinfo.cc_princhash.cp_len = 0; |
|
|
|
ret = cld_pipe_upcall(cn->cn_pipe, cmsg, nn); |
|
if (!ret) { |
|
ret = cmsg->cm_status; |
|
set_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags); |
|
} |
|
|
|
out: |
|
free_cld_upcall(cup); |
|
out_err: |
|
if (ret) |
|
pr_err("NFSD: Unable to create client record on stable storage: %d\n", |
|
ret); |
|
} |
|
|
|
/* Ask daemon to create a new record */ |
|
static void |
|
nfsd4_cld_remove(struct nfs4_client *clp) |
|
{ |
|
int ret; |
|
struct cld_upcall *cup; |
|
struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id); |
|
struct cld_net *cn = nn->cld_net; |
|
|
|
/* Don't upcall if it's already removed */ |
|
if (!test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags)) |
|
return; |
|
|
|
cup = alloc_cld_upcall(nn); |
|
if (!cup) { |
|
ret = -ENOMEM; |
|
goto out_err; |
|
} |
|
|
|
cup->cu_u.cu_msg.cm_cmd = Cld_Remove; |
|
cup->cu_u.cu_msg.cm_u.cm_name.cn_len = clp->cl_name.len; |
|
memcpy(cup->cu_u.cu_msg.cm_u.cm_name.cn_id, clp->cl_name.data, |
|
clp->cl_name.len); |
|
|
|
ret = cld_pipe_upcall(cn->cn_pipe, &cup->cu_u.cu_msg, nn); |
|
if (!ret) { |
|
ret = cup->cu_u.cu_msg.cm_status; |
|
clear_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags); |
|
} |
|
|
|
free_cld_upcall(cup); |
|
out_err: |
|
if (ret) |
|
printk(KERN_ERR "NFSD: Unable to remove client " |
|
"record from stable storage: %d\n", ret); |
|
} |
|
|
|
/* |
|
* For older nfsdcld's that do not allow us to "slurp" the clients |
|
* from the tracking database during startup. |
|
* |
|
* Check for presence of a record, and update its timestamp |
|
*/ |
|
static int |
|
nfsd4_cld_check_v0(struct nfs4_client *clp) |
|
{ |
|
int ret; |
|
struct cld_upcall *cup; |
|
struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id); |
|
struct cld_net *cn = nn->cld_net; |
|
|
|
/* Don't upcall if one was already stored during this grace pd */ |
|
if (test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags)) |
|
return 0; |
|
|
|
cup = alloc_cld_upcall(nn); |
|
if (!cup) { |
|
printk(KERN_ERR "NFSD: Unable to check client record on " |
|
"stable storage: %d\n", -ENOMEM); |
|
return -ENOMEM; |
|
} |
|
|
|
cup->cu_u.cu_msg.cm_cmd = Cld_Check; |
|
cup->cu_u.cu_msg.cm_u.cm_name.cn_len = clp->cl_name.len; |
|
memcpy(cup->cu_u.cu_msg.cm_u.cm_name.cn_id, clp->cl_name.data, |
|
clp->cl_name.len); |
|
|
|
ret = cld_pipe_upcall(cn->cn_pipe, &cup->cu_u.cu_msg, nn); |
|
if (!ret) { |
|
ret = cup->cu_u.cu_msg.cm_status; |
|
set_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags); |
|
} |
|
|
|
free_cld_upcall(cup); |
|
return ret; |
|
} |
|
|
|
/* |
|
* For newer nfsdcld's that allow us to "slurp" the clients |
|
* from the tracking database during startup. |
|
* |
|
* Check for presence of a record in the reclaim_str_hashtbl |
|
*/ |
|
static int |
|
nfsd4_cld_check(struct nfs4_client *clp) |
|
{ |
|
struct nfs4_client_reclaim *crp; |
|
struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id); |
|
struct cld_net *cn = nn->cld_net; |
|
int status; |
|
char dname[HEXDIR_LEN]; |
|
struct xdr_netobj name; |
|
|
|
/* did we already find that this client is stable? */ |
|
if (test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags)) |
|
return 0; |
|
|
|
/* look for it in the reclaim hashtable otherwise */ |
|
crp = nfsd4_find_reclaim_client(clp->cl_name, nn); |
|
if (crp) |
|
goto found; |
|
|
|
if (cn->cn_has_legacy) { |
|
status = nfs4_make_rec_clidname(dname, &clp->cl_name); |
|
if (status) |
|
return -ENOENT; |
|
|
|
name.data = kmemdup(dname, HEXDIR_LEN, GFP_KERNEL); |
|
if (!name.data) { |
|
dprintk("%s: failed to allocate memory for name.data!\n", |
|
__func__); |
|
return -ENOENT; |
|
} |
|
name.len = HEXDIR_LEN; |
|
crp = nfsd4_find_reclaim_client(name, nn); |
|
kfree(name.data); |
|
if (crp) |
|
goto found; |
|
|
|
} |
|
return -ENOENT; |
|
found: |
|
crp->cr_clp = clp; |
|
return 0; |
|
} |
|
|
|
static int |
|
nfsd4_cld_check_v2(struct nfs4_client *clp) |
|
{ |
|
struct nfs4_client_reclaim *crp; |
|
struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id); |
|
struct cld_net *cn = nn->cld_net; |
|
int status; |
|
char dname[HEXDIR_LEN]; |
|
struct xdr_netobj name; |
|
struct crypto_shash *tfm = cn->cn_tfm; |
|
struct xdr_netobj cksum; |
|
char *principal = NULL; |
|
|
|
/* did we already find that this client is stable? */ |
|
if (test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags)) |
|
return 0; |
|
|
|
/* look for it in the reclaim hashtable otherwise */ |
|
crp = nfsd4_find_reclaim_client(clp->cl_name, nn); |
|
if (crp) |
|
goto found; |
|
|
|
if (cn->cn_has_legacy) { |
|
status = nfs4_make_rec_clidname(dname, &clp->cl_name); |
|
if (status) |
|
return -ENOENT; |
|
|
|
name.data = kmemdup(dname, HEXDIR_LEN, GFP_KERNEL); |
|
if (!name.data) { |
|
dprintk("%s: failed to allocate memory for name.data\n", |
|
__func__); |
|
return -ENOENT; |
|
} |
|
name.len = HEXDIR_LEN; |
|
crp = nfsd4_find_reclaim_client(name, nn); |
|
kfree(name.data); |
|
if (crp) |
|
goto found; |
|
|
|
} |
|
return -ENOENT; |
|
found: |
|
if (crp->cr_princhash.len) { |
|
if (clp->cl_cred.cr_raw_principal) |
|
principal = clp->cl_cred.cr_raw_principal; |
|
else if (clp->cl_cred.cr_principal) |
|
principal = clp->cl_cred.cr_principal; |
|
if (principal == NULL) |
|
return -ENOENT; |
|
cksum.len = crypto_shash_digestsize(tfm); |
|
cksum.data = kmalloc(cksum.len, GFP_KERNEL); |
|
if (cksum.data == NULL) |
|
return -ENOENT; |
|
status = crypto_shash_tfm_digest(tfm, principal, |
|
strlen(principal), cksum.data); |
|
if (status) { |
|
kfree(cksum.data); |
|
return -ENOENT; |
|
} |
|
if (memcmp(crp->cr_princhash.data, cksum.data, |
|
crp->cr_princhash.len)) { |
|
kfree(cksum.data); |
|
return -ENOENT; |
|
} |
|
kfree(cksum.data); |
|
} |
|
crp->cr_clp = clp; |
|
return 0; |
|
} |
|
|
|
static int |
|
nfsd4_cld_grace_start(struct nfsd_net *nn) |
|
{ |
|
int ret; |
|
struct cld_upcall *cup; |
|
struct cld_net *cn = nn->cld_net; |
|
|
|
cup = alloc_cld_upcall(nn); |
|
if (!cup) { |
|
ret = -ENOMEM; |
|
goto out_err; |
|
} |
|
|
|
cup->cu_u.cu_msg.cm_cmd = Cld_GraceStart; |
|
ret = cld_pipe_upcall(cn->cn_pipe, &cup->cu_u.cu_msg, nn); |
|
if (!ret) |
|
ret = cup->cu_u.cu_msg.cm_status; |
|
|
|
free_cld_upcall(cup); |
|
out_err: |
|
if (ret) |
|
dprintk("%s: Unable to get clients from userspace: %d\n", |
|
__func__, ret); |
|
return ret; |
|
} |
|
|
|
/* For older nfsdcld's that need cm_gracetime */ |
|
static void |
|
nfsd4_cld_grace_done_v0(struct nfsd_net *nn) |
|
{ |
|
int ret; |
|
struct cld_upcall *cup; |
|
struct cld_net *cn = nn->cld_net; |
|
|
|
cup = alloc_cld_upcall(nn); |
|
if (!cup) { |
|
ret = -ENOMEM; |
|
goto out_err; |
|
} |
|
|
|
cup->cu_u.cu_msg.cm_cmd = Cld_GraceDone; |
|
cup->cu_u.cu_msg.cm_u.cm_gracetime = nn->boot_time; |
|
ret = cld_pipe_upcall(cn->cn_pipe, &cup->cu_u.cu_msg, nn); |
|
if (!ret) |
|
ret = cup->cu_u.cu_msg.cm_status; |
|
|
|
free_cld_upcall(cup); |
|
out_err: |
|
if (ret) |
|
printk(KERN_ERR "NFSD: Unable to end grace period: %d\n", ret); |
|
} |
|
|
|
/* |
|
* For newer nfsdcld's that do not need cm_gracetime. We also need to call |
|
* nfs4_release_reclaim() to clear out the reclaim_str_hashtbl. |
|
*/ |
|
static void |
|
nfsd4_cld_grace_done(struct nfsd_net *nn) |
|
{ |
|
int ret; |
|
struct cld_upcall *cup; |
|
struct cld_net *cn = nn->cld_net; |
|
|
|
cup = alloc_cld_upcall(nn); |
|
if (!cup) { |
|
ret = -ENOMEM; |
|
goto out_err; |
|
} |
|
|
|
cup->cu_u.cu_msg.cm_cmd = Cld_GraceDone; |
|
ret = cld_pipe_upcall(cn->cn_pipe, &cup->cu_u.cu_msg, nn); |
|
if (!ret) |
|
ret = cup->cu_u.cu_msg.cm_status; |
|
|
|
free_cld_upcall(cup); |
|
out_err: |
|
nfs4_release_reclaim(nn); |
|
if (ret) |
|
printk(KERN_ERR "NFSD: Unable to end grace period: %d\n", ret); |
|
} |
|
|
|
static int |
|
nfs4_cld_state_init(struct net *net) |
|
{ |
|
struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
|
int i; |
|
|
|
nn->reclaim_str_hashtbl = kmalloc_array(CLIENT_HASH_SIZE, |
|
sizeof(struct list_head), |
|
GFP_KERNEL); |
|
if (!nn->reclaim_str_hashtbl) |
|
return -ENOMEM; |
|
|
|
for (i = 0; i < CLIENT_HASH_SIZE; i++) |
|
INIT_LIST_HEAD(&nn->reclaim_str_hashtbl[i]); |
|
nn->reclaim_str_hashtbl_size = 0; |
|
nn->track_reclaim_completes = true; |
|
atomic_set(&nn->nr_reclaim_complete, 0); |
|
|
|
return 0; |
|
} |
|
|
|
static void |
|
nfs4_cld_state_shutdown(struct net *net) |
|
{ |
|
struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
|
|
|
nn->track_reclaim_completes = false; |
|
kfree(nn->reclaim_str_hashtbl); |
|
} |
|
|
|
static bool |
|
cld_running(struct nfsd_net *nn) |
|
{ |
|
struct cld_net *cn = nn->cld_net; |
|
struct rpc_pipe *pipe = cn->cn_pipe; |
|
|
|
return pipe->nreaders || pipe->nwriters; |
|
} |
|
|
|
static int |
|
nfsd4_cld_get_version(struct nfsd_net *nn) |
|
{ |
|
int ret = 0; |
|
struct cld_upcall *cup; |
|
struct cld_net *cn = nn->cld_net; |
|
uint8_t version; |
|
|
|
cup = alloc_cld_upcall(nn); |
|
if (!cup) { |
|
ret = -ENOMEM; |
|
goto out_err; |
|
} |
|
cup->cu_u.cu_msg.cm_cmd = Cld_GetVersion; |
|
ret = cld_pipe_upcall(cn->cn_pipe, &cup->cu_u.cu_msg, nn); |
|
if (!ret) { |
|
ret = cup->cu_u.cu_msg.cm_status; |
|
if (ret) |
|
goto out_free; |
|
version = cup->cu_u.cu_msg.cm_u.cm_version; |
|
dprintk("%s: userspace returned version %u\n", |
|
__func__, version); |
|
if (version < 1) |
|
version = 1; |
|
else if (version > CLD_UPCALL_VERSION) |
|
version = CLD_UPCALL_VERSION; |
|
|
|
switch (version) { |
|
case 1: |
|
nn->client_tracking_ops = &nfsd4_cld_tracking_ops; |
|
break; |
|
case 2: |
|
nn->client_tracking_ops = &nfsd4_cld_tracking_ops_v2; |
|
break; |
|
default: |
|
break; |
|
} |
|
} |
|
out_free: |
|
free_cld_upcall(cup); |
|
out_err: |
|
if (ret) |
|
dprintk("%s: Unable to get version from userspace: %d\n", |
|
__func__, ret); |
|
return ret; |
|
} |
|
|
|
static int |
|
nfsd4_cld_tracking_init(struct net *net) |
|
{ |
|
int status; |
|
struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
|
bool running; |
|
int retries = 10; |
|
struct crypto_shash *tfm; |
|
|
|
status = nfs4_cld_state_init(net); |
|
if (status) |
|
return status; |
|
|
|
status = __nfsd4_init_cld_pipe(net); |
|
if (status) |
|
goto err_shutdown; |
|
|
|
/* |
|
* rpc pipe upcalls take 30 seconds to time out, so we don't want to |
|
* queue an upcall unless we know that nfsdcld is running (because we |
|
* want this to fail fast so that nfsd4_client_tracking_init() can try |
|
* the next client tracking method). nfsdcld should already be running |
|
* before nfsd is started, so the wait here is for nfsdcld to open the |
|
* pipefs file we just created. |
|
*/ |
|
while (!(running = cld_running(nn)) && retries--) |
|
msleep(100); |
|
|
|
if (!running) { |
|
status = -ETIMEDOUT; |
|
goto err_remove; |
|
} |
|
tfm = crypto_alloc_shash("sha256", 0, 0); |
|
if (IS_ERR(tfm)) { |
|
status = PTR_ERR(tfm); |
|
goto err_remove; |
|
} |
|
nn->cld_net->cn_tfm = tfm; |
|
|
|
status = nfsd4_cld_get_version(nn); |
|
if (status == -EOPNOTSUPP) |
|
pr_warn("NFSD: nfsdcld GetVersion upcall failed. Please upgrade nfsdcld.\n"); |
|
|
|
status = nfsd4_cld_grace_start(nn); |
|
if (status) { |
|
if (status == -EOPNOTSUPP) |
|
pr_warn("NFSD: nfsdcld GraceStart upcall failed. Please upgrade nfsdcld.\n"); |
|
nfs4_release_reclaim(nn); |
|
goto err_remove; |
|
} else |
|
pr_info("NFSD: Using nfsdcld client tracking operations.\n"); |
|
return 0; |
|
|
|
err_remove: |
|
nfsd4_remove_cld_pipe(net); |
|
err_shutdown: |
|
nfs4_cld_state_shutdown(net); |
|
return status; |
|
} |
|
|
|
static void |
|
nfsd4_cld_tracking_exit(struct net *net) |
|
{ |
|
struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
|
|
|
nfs4_release_reclaim(nn); |
|
nfsd4_remove_cld_pipe(net); |
|
nfs4_cld_state_shutdown(net); |
|
} |
|
|
|
/* For older nfsdcld's */ |
|
static const struct nfsd4_client_tracking_ops nfsd4_cld_tracking_ops_v0 = { |
|
.init = nfsd4_init_cld_pipe, |
|
.exit = nfsd4_remove_cld_pipe, |
|
.create = nfsd4_cld_create, |
|
.remove = nfsd4_cld_remove, |
|
.check = nfsd4_cld_check_v0, |
|
.grace_done = nfsd4_cld_grace_done_v0, |
|
.version = 1, |
|
.msglen = sizeof(struct cld_msg), |
|
}; |
|
|
|
/* For newer nfsdcld's */ |
|
static const struct nfsd4_client_tracking_ops nfsd4_cld_tracking_ops = { |
|
.init = nfsd4_cld_tracking_init, |
|
.exit = nfsd4_cld_tracking_exit, |
|
.create = nfsd4_cld_create, |
|
.remove = nfsd4_cld_remove, |
|
.check = nfsd4_cld_check, |
|
.grace_done = nfsd4_cld_grace_done, |
|
.version = 1, |
|
.msglen = sizeof(struct cld_msg), |
|
}; |
|
|
|
/* v2 create/check ops include the principal, if available */ |
|
static const struct nfsd4_client_tracking_ops nfsd4_cld_tracking_ops_v2 = { |
|
.init = nfsd4_cld_tracking_init, |
|
.exit = nfsd4_cld_tracking_exit, |
|
.create = nfsd4_cld_create_v2, |
|
.remove = nfsd4_cld_remove, |
|
.check = nfsd4_cld_check_v2, |
|
.grace_done = nfsd4_cld_grace_done, |
|
.version = 2, |
|
.msglen = sizeof(struct cld_msg_v2), |
|
}; |
|
|
|
/* upcall via usermodehelper */ |
|
static char cltrack_prog[PATH_MAX] = "/sbin/nfsdcltrack"; |
|
module_param_string(cltrack_prog, cltrack_prog, sizeof(cltrack_prog), |
|
S_IRUGO|S_IWUSR); |
|
MODULE_PARM_DESC(cltrack_prog, "Path to the nfsdcltrack upcall program"); |
|
|
|
static bool cltrack_legacy_disable; |
|
module_param(cltrack_legacy_disable, bool, S_IRUGO|S_IWUSR); |
|
MODULE_PARM_DESC(cltrack_legacy_disable, |
|
"Disable legacy recoverydir conversion. Default: false"); |
|
|
|
#define LEGACY_TOPDIR_ENV_PREFIX "NFSDCLTRACK_LEGACY_TOPDIR=" |
|
#define LEGACY_RECDIR_ENV_PREFIX "NFSDCLTRACK_LEGACY_RECDIR=" |
|
#define HAS_SESSION_ENV_PREFIX "NFSDCLTRACK_CLIENT_HAS_SESSION=" |
|
#define GRACE_START_ENV_PREFIX "NFSDCLTRACK_GRACE_START=" |
|
|
|
static char * |
|
nfsd4_cltrack_legacy_topdir(void) |
|
{ |
|
int copied; |
|
size_t len; |
|
char *result; |
|
|
|
if (cltrack_legacy_disable) |
|
return NULL; |
|
|
|
len = strlen(LEGACY_TOPDIR_ENV_PREFIX) + |
|
strlen(nfs4_recoverydir()) + 1; |
|
|
|
result = kmalloc(len, GFP_KERNEL); |
|
if (!result) |
|
return result; |
|
|
|
copied = snprintf(result, len, LEGACY_TOPDIR_ENV_PREFIX "%s", |
|
nfs4_recoverydir()); |
|
if (copied >= len) { |
|
/* just return nothing if output was truncated */ |
|
kfree(result); |
|
return NULL; |
|
} |
|
|
|
return result; |
|
} |
|
|
|
static char * |
|
nfsd4_cltrack_legacy_recdir(const struct xdr_netobj *name) |
|
{ |
|
int copied; |
|
size_t len; |
|
char *result; |
|
|
|
if (cltrack_legacy_disable) |
|
return NULL; |
|
|
|
/* +1 is for '/' between "topdir" and "recdir" */ |
|
len = strlen(LEGACY_RECDIR_ENV_PREFIX) + |
|
strlen(nfs4_recoverydir()) + 1 + HEXDIR_LEN; |
|
|
|
result = kmalloc(len, GFP_KERNEL); |
|
if (!result) |
|
return result; |
|
|
|
copied = snprintf(result, len, LEGACY_RECDIR_ENV_PREFIX "%s/", |
|
nfs4_recoverydir()); |
|
if (copied > (len - HEXDIR_LEN)) { |
|
/* just return nothing if output will be truncated */ |
|
kfree(result); |
|
return NULL; |
|
} |
|
|
|
copied = nfs4_make_rec_clidname(result + copied, name); |
|
if (copied) { |
|
kfree(result); |
|
return NULL; |
|
} |
|
|
|
return result; |
|
} |
|
|
|
static char * |
|
nfsd4_cltrack_client_has_session(struct nfs4_client *clp) |
|
{ |
|
int copied; |
|
size_t len; |
|
char *result; |
|
|
|
/* prefix + Y/N character + terminating NULL */ |
|
len = strlen(HAS_SESSION_ENV_PREFIX) + 1 + 1; |
|
|
|
result = kmalloc(len, GFP_KERNEL); |
|
if (!result) |
|
return result; |
|
|
|
copied = snprintf(result, len, HAS_SESSION_ENV_PREFIX "%c", |
|
clp->cl_minorversion ? 'Y' : 'N'); |
|
if (copied >= len) { |
|
/* just return nothing if output was truncated */ |
|
kfree(result); |
|
return NULL; |
|
} |
|
|
|
return result; |
|
} |
|
|
|
static char * |
|
nfsd4_cltrack_grace_start(time64_t grace_start) |
|
{ |
|
int copied; |
|
size_t len; |
|
char *result; |
|
|
|
/* prefix + max width of int64_t string + terminating NULL */ |
|
len = strlen(GRACE_START_ENV_PREFIX) + 22 + 1; |
|
|
|
result = kmalloc(len, GFP_KERNEL); |
|
if (!result) |
|
return result; |
|
|
|
copied = snprintf(result, len, GRACE_START_ENV_PREFIX "%lld", |
|
grace_start); |
|
if (copied >= len) { |
|
/* just return nothing if output was truncated */ |
|
kfree(result); |
|
return NULL; |
|
} |
|
|
|
return result; |
|
} |
|
|
|
static int |
|
nfsd4_umh_cltrack_upcall(char *cmd, char *arg, char *env0, char *env1) |
|
{ |
|
char *envp[3]; |
|
char *argv[4]; |
|
int ret; |
|
|
|
if (unlikely(!cltrack_prog[0])) { |
|
dprintk("%s: cltrack_prog is disabled\n", __func__); |
|
return -EACCES; |
|
} |
|
|
|
dprintk("%s: cmd: %s\n", __func__, cmd); |
|
dprintk("%s: arg: %s\n", __func__, arg ? arg : "(null)"); |
|
dprintk("%s: env0: %s\n", __func__, env0 ? env0 : "(null)"); |
|
dprintk("%s: env1: %s\n", __func__, env1 ? env1 : "(null)"); |
|
|
|
envp[0] = env0; |
|
envp[1] = env1; |
|
envp[2] = NULL; |
|
|
|
argv[0] = (char *)cltrack_prog; |
|
argv[1] = cmd; |
|
argv[2] = arg; |
|
argv[3] = NULL; |
|
|
|
ret = call_usermodehelper(argv[0], argv, envp, UMH_WAIT_PROC); |
|
/* |
|
* Disable the upcall mechanism if we're getting an ENOENT or EACCES |
|
* error. The admin can re-enable it on the fly by using sysfs |
|
* once the problem has been fixed. |
|
*/ |
|
if (ret == -ENOENT || ret == -EACCES) { |
|
dprintk("NFSD: %s was not found or isn't executable (%d). " |
|
"Setting cltrack_prog to blank string!", |
|
cltrack_prog, ret); |
|
cltrack_prog[0] = '\0'; |
|
} |
|
dprintk("%s: %s return value: %d\n", __func__, cltrack_prog, ret); |
|
|
|
return ret; |
|
} |
|
|
|
static char * |
|
bin_to_hex_dup(const unsigned char *src, int srclen) |
|
{ |
|
char *buf; |
|
|
|
/* +1 for terminating NULL */ |
|
buf = kzalloc((srclen * 2) + 1, GFP_KERNEL); |
|
if (!buf) |
|
return buf; |
|
|
|
bin2hex(buf, src, srclen); |
|
return buf; |
|
} |
|
|
|
static int |
|
nfsd4_umh_cltrack_init(struct net *net) |
|
{ |
|
int ret; |
|
struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
|
char *grace_start = nfsd4_cltrack_grace_start(nn->boot_time); |
|
|
|
/* XXX: The usermode helper s not working in container yet. */ |
|
if (net != &init_net) { |
|
pr_warn("NFSD: attempt to initialize umh client tracking in a container ignored.\n"); |
|
kfree(grace_start); |
|
return -EINVAL; |
|
} |
|
|
|
ret = nfsd4_umh_cltrack_upcall("init", NULL, grace_start, NULL); |
|
kfree(grace_start); |
|
if (!ret) |
|
pr_info("NFSD: Using UMH upcall client tracking operations.\n"); |
|
return ret; |
|
} |
|
|
|
static void |
|
nfsd4_cltrack_upcall_lock(struct nfs4_client *clp) |
|
{ |
|
wait_on_bit_lock(&clp->cl_flags, NFSD4_CLIENT_UPCALL_LOCK, |
|
TASK_UNINTERRUPTIBLE); |
|
} |
|
|
|
static void |
|
nfsd4_cltrack_upcall_unlock(struct nfs4_client *clp) |
|
{ |
|
smp_mb__before_atomic(); |
|
clear_bit(NFSD4_CLIENT_UPCALL_LOCK, &clp->cl_flags); |
|
smp_mb__after_atomic(); |
|
wake_up_bit(&clp->cl_flags, NFSD4_CLIENT_UPCALL_LOCK); |
|
} |
|
|
|
static void |
|
nfsd4_umh_cltrack_create(struct nfs4_client *clp) |
|
{ |
|
char *hexid, *has_session, *grace_start; |
|
struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id); |
|
|
|
/* |
|
* With v4.0 clients, there's little difference in outcome between a |
|
* create and check operation, and we can end up calling into this |
|
* function multiple times per client (once for each openowner). So, |
|
* for v4.0 clients skip upcalling once the client has been recorded |
|
* on stable storage. |
|
* |
|
* For v4.1+ clients, the outcome of the two operations is different, |
|
* so we must ensure that we upcall for the create operation. v4.1+ |
|
* clients call this on RECLAIM_COMPLETE though, so we should only end |
|
* up doing a single create upcall per client. |
|
*/ |
|
if (clp->cl_minorversion == 0 && |
|
test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags)) |
|
return; |
|
|
|
hexid = bin_to_hex_dup(clp->cl_name.data, clp->cl_name.len); |
|
if (!hexid) { |
|
dprintk("%s: can't allocate memory for upcall!\n", __func__); |
|
return; |
|
} |
|
|
|
has_session = nfsd4_cltrack_client_has_session(clp); |
|
grace_start = nfsd4_cltrack_grace_start(nn->boot_time); |
|
|
|
nfsd4_cltrack_upcall_lock(clp); |
|
if (!nfsd4_umh_cltrack_upcall("create", hexid, has_session, grace_start)) |
|
set_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags); |
|
nfsd4_cltrack_upcall_unlock(clp); |
|
|
|
kfree(has_session); |
|
kfree(grace_start); |
|
kfree(hexid); |
|
} |
|
|
|
static void |
|
nfsd4_umh_cltrack_remove(struct nfs4_client *clp) |
|
{ |
|
char *hexid; |
|
|
|
if (!test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags)) |
|
return; |
|
|
|
hexid = bin_to_hex_dup(clp->cl_name.data, clp->cl_name.len); |
|
if (!hexid) { |
|
dprintk("%s: can't allocate memory for upcall!\n", __func__); |
|
return; |
|
} |
|
|
|
nfsd4_cltrack_upcall_lock(clp); |
|
if (test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags) && |
|
nfsd4_umh_cltrack_upcall("remove", hexid, NULL, NULL) == 0) |
|
clear_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags); |
|
nfsd4_cltrack_upcall_unlock(clp); |
|
|
|
kfree(hexid); |
|
} |
|
|
|
static int |
|
nfsd4_umh_cltrack_check(struct nfs4_client *clp) |
|
{ |
|
int ret; |
|
char *hexid, *has_session, *legacy; |
|
|
|
if (test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags)) |
|
return 0; |
|
|
|
hexid = bin_to_hex_dup(clp->cl_name.data, clp->cl_name.len); |
|
if (!hexid) { |
|
dprintk("%s: can't allocate memory for upcall!\n", __func__); |
|
return -ENOMEM; |
|
} |
|
|
|
has_session = nfsd4_cltrack_client_has_session(clp); |
|
legacy = nfsd4_cltrack_legacy_recdir(&clp->cl_name); |
|
|
|
nfsd4_cltrack_upcall_lock(clp); |
|
if (test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags)) { |
|
ret = 0; |
|
} else { |
|
ret = nfsd4_umh_cltrack_upcall("check", hexid, has_session, legacy); |
|
if (ret == 0) |
|
set_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags); |
|
} |
|
nfsd4_cltrack_upcall_unlock(clp); |
|
kfree(has_session); |
|
kfree(legacy); |
|
kfree(hexid); |
|
|
|
return ret; |
|
} |
|
|
|
static void |
|
nfsd4_umh_cltrack_grace_done(struct nfsd_net *nn) |
|
{ |
|
char *legacy; |
|
char timestr[22]; /* FIXME: better way to determine max size? */ |
|
|
|
sprintf(timestr, "%lld", nn->boot_time); |
|
legacy = nfsd4_cltrack_legacy_topdir(); |
|
nfsd4_umh_cltrack_upcall("gracedone", timestr, legacy, NULL); |
|
kfree(legacy); |
|
} |
|
|
|
static const struct nfsd4_client_tracking_ops nfsd4_umh_tracking_ops = { |
|
.init = nfsd4_umh_cltrack_init, |
|
.exit = NULL, |
|
.create = nfsd4_umh_cltrack_create, |
|
.remove = nfsd4_umh_cltrack_remove, |
|
.check = nfsd4_umh_cltrack_check, |
|
.grace_done = nfsd4_umh_cltrack_grace_done, |
|
.version = 1, |
|
.msglen = 0, |
|
}; |
|
|
|
int |
|
nfsd4_client_tracking_init(struct net *net) |
|
{ |
|
int status; |
|
struct path path; |
|
struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
|
|
|
/* just run the init if it the method is already decided */ |
|
if (nn->client_tracking_ops) |
|
goto do_init; |
|
|
|
/* First, try to use nfsdcld */ |
|
nn->client_tracking_ops = &nfsd4_cld_tracking_ops; |
|
status = nn->client_tracking_ops->init(net); |
|
if (!status) |
|
return status; |
|
if (status != -ETIMEDOUT) { |
|
nn->client_tracking_ops = &nfsd4_cld_tracking_ops_v0; |
|
status = nn->client_tracking_ops->init(net); |
|
if (!status) |
|
return status; |
|
} |
|
|
|
/* |
|
* Next, try the UMH upcall. |
|
*/ |
|
nn->client_tracking_ops = &nfsd4_umh_tracking_ops; |
|
status = nn->client_tracking_ops->init(net); |
|
if (!status) |
|
return status; |
|
|
|
/* |
|
* Finally, See if the recoverydir exists and is a directory. |
|
* If it is, then use the legacy ops. |
|
*/ |
|
nn->client_tracking_ops = &nfsd4_legacy_tracking_ops; |
|
status = kern_path(nfs4_recoverydir(), LOOKUP_FOLLOW, &path); |
|
if (!status) { |
|
status = d_is_dir(path.dentry); |
|
path_put(&path); |
|
if (!status) { |
|
status = -EINVAL; |
|
goto out; |
|
} |
|
} |
|
|
|
do_init: |
|
status = nn->client_tracking_ops->init(net); |
|
out: |
|
if (status) { |
|
printk(KERN_WARNING "NFSD: Unable to initialize client " |
|
"recovery tracking! (%d)\n", status); |
|
nn->client_tracking_ops = NULL; |
|
} |
|
return status; |
|
} |
|
|
|
void |
|
nfsd4_client_tracking_exit(struct net *net) |
|
{ |
|
struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
|
|
|
if (nn->client_tracking_ops) { |
|
if (nn->client_tracking_ops->exit) |
|
nn->client_tracking_ops->exit(net); |
|
nn->client_tracking_ops = NULL; |
|
} |
|
} |
|
|
|
void |
|
nfsd4_client_record_create(struct nfs4_client *clp) |
|
{ |
|
struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id); |
|
|
|
if (nn->client_tracking_ops) |
|
nn->client_tracking_ops->create(clp); |
|
} |
|
|
|
void |
|
nfsd4_client_record_remove(struct nfs4_client *clp) |
|
{ |
|
struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id); |
|
|
|
if (nn->client_tracking_ops) |
|
nn->client_tracking_ops->remove(clp); |
|
} |
|
|
|
int |
|
nfsd4_client_record_check(struct nfs4_client *clp) |
|
{ |
|
struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id); |
|
|
|
if (nn->client_tracking_ops) |
|
return nn->client_tracking_ops->check(clp); |
|
|
|
return -EOPNOTSUPP; |
|
} |
|
|
|
void |
|
nfsd4_record_grace_done(struct nfsd_net *nn) |
|
{ |
|
if (nn->client_tracking_ops) |
|
nn->client_tracking_ops->grace_done(nn); |
|
} |
|
|
|
static int |
|
rpc_pipefs_event(struct notifier_block *nb, unsigned long event, void *ptr) |
|
{ |
|
struct super_block *sb = ptr; |
|
struct net *net = sb->s_fs_info; |
|
struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
|
struct cld_net *cn = nn->cld_net; |
|
struct dentry *dentry; |
|
int ret = 0; |
|
|
|
if (!try_module_get(THIS_MODULE)) |
|
return 0; |
|
|
|
if (!cn) { |
|
module_put(THIS_MODULE); |
|
return 0; |
|
} |
|
|
|
switch (event) { |
|
case RPC_PIPEFS_MOUNT: |
|
dentry = nfsd4_cld_register_sb(sb, cn->cn_pipe); |
|
if (IS_ERR(dentry)) { |
|
ret = PTR_ERR(dentry); |
|
break; |
|
} |
|
cn->cn_pipe->dentry = dentry; |
|
break; |
|
case RPC_PIPEFS_UMOUNT: |
|
if (cn->cn_pipe->dentry) |
|
nfsd4_cld_unregister_sb(cn->cn_pipe); |
|
break; |
|
default: |
|
ret = -ENOTSUPP; |
|
break; |
|
} |
|
module_put(THIS_MODULE); |
|
return ret; |
|
} |
|
|
|
static struct notifier_block nfsd4_cld_block = { |
|
.notifier_call = rpc_pipefs_event, |
|
}; |
|
|
|
int |
|
register_cld_notifier(void) |
|
{ |
|
WARN_ON(!nfsd_net_id); |
|
return rpc_pipefs_notifier_register(&nfsd4_cld_block); |
|
} |
|
|
|
void |
|
unregister_cld_notifier(void) |
|
{ |
|
rpc_pipefs_notifier_unregister(&nfsd4_cld_block); |
|
}
|
|
|