Commit c7b9a459 authored by NeilBrown's avatar NeilBrown Committed by Linus Torvalds

[PATCH] knfsd: nfsd4: reboot recovery

This patch adds the code to create and remove client subdirectories from the
recovery directory, as described in the previous patch comment.
Signed-off-by: default avatarAndy Adamson <andros@citi.umich.edu>
Signed-off-by: default avatarJ. Bruce Fields <bfields@citi.umich.edu>
Signed-off-by: default avatarNeil Brown <neilb@cse.unsw.edu.au>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent 190e4fbf
......@@ -120,6 +120,70 @@ out:
return status;
}
static int
nfsd4_rec_fsync(struct dentry *dentry)
{
struct file *filp;
int status = nfs_ok;
dprintk("NFSD: nfs4_fsync_rec_dir\n");
filp = dentry_open(dget(dentry), mntget(rec_dir.mnt), O_RDWR);
if (IS_ERR(filp)) {
status = PTR_ERR(filp);
goto out;
}
if (filp->f_op && filp->f_op->fsync)
status = filp->f_op->fsync(filp, filp->f_dentry, 0);
fput(filp);
out:
if (status)
printk("nfsd4: unable to sync recovery directory\n");
return status;
}
int
nfsd4_create_clid_dir(struct nfs4_client *clp)
{
char *dname = clp->cl_recdir;
struct dentry *dentry;
uid_t uid;
gid_t gid;
int status;
dprintk("NFSD: nfsd4_create_clid_dir for \"%s\"\n", dname);
if (!rec_dir_init || clp->cl_firststate)
return 0;
nfs4_save_user(&uid, &gid);
/* lock the parent */
down(&rec_dir.dentry->d_inode->i_sem);
dentry = lookup_one_len(dname, rec_dir.dentry, HEXDIR_LEN-1);
if (IS_ERR(dentry)) {
status = PTR_ERR(dentry);
goto out_unlock;
}
status = -EEXIST;
if (dentry->d_inode) {
dprintk("NFSD: nfsd4_create_clid_dir: DIRECTORY EXISTS\n");
goto out_put;
}
status = vfs_mkdir(rec_dir.dentry->d_inode, dentry, S_IRWXU);
out_put:
dput(dentry);
out_unlock:
up(&rec_dir.dentry->d_inode->i_sem);
if (status == 0) {
clp->cl_firststate = 1;
status = nfsd4_rec_fsync(rec_dir.dentry);
}
nfs4_reset_user(uid, gid);
dprintk("NFSD: nfsd4_create_clid_dir returns %d\n", status);
return status;
}
typedef int (recdir_func)(struct dentry *, struct dentry *);
struct dentry_list {
......@@ -201,6 +265,111 @@ out:
return status;
}
static int
nfsd4_remove_clid_file(struct dentry *dir, struct dentry *dentry)
{
int status;
if (!S_ISREG(dir->d_inode->i_mode)) {
printk("nfsd4: non-file found in client recovery directory\n");
return -EINVAL;
}
down(&dir->d_inode->i_sem);
status = vfs_unlink(dir->d_inode, dentry);
up(&dir->d_inode->i_sem);
return status;
}
static int
nfsd4_clear_clid_dir(struct dentry *dir, struct dentry *dentry)
{
int status;
/* For now this directory should already be empty, but we empty it of
* any regular files anyway, just in case the directory was created by
* a kernel from the future.... */
nfsd4_list_rec_dir(dentry, nfsd4_remove_clid_file);
down(&dir->d_inode->i_sem);
status = vfs_rmdir(dir->d_inode, dentry);
up(&dir->d_inode->i_sem);
return status;
}
static int
nfsd4_unlink_clid_dir(char *name, int namlen)
{
struct dentry *dentry;
int status;
dprintk("NFSD: nfsd4_unlink_clid_dir. name %.*s\n", namlen, name);
dentry = lookup_one_len(name, rec_dir.dentry, namlen);
if (IS_ERR(dentry)) {
status = PTR_ERR(dentry);
return status;
}
status = -ENOENT;
if (!dentry->d_inode)
goto out;
status = nfsd4_clear_clid_dir(rec_dir.dentry, dentry);
out:
dput(dentry);
return status;
}
void
nfsd4_remove_clid_dir(struct nfs4_client *clp)
{
uid_t uid;
gid_t gid;
int status;
if (!rec_dir_init || !clp->cl_firststate)
return;
nfs4_save_user(&uid, &gid);
status = nfsd4_unlink_clid_dir(clp->cl_recdir, HEXDIR_LEN-1);
nfs4_reset_user(uid, gid);
if (status == 0)
status = nfsd4_rec_fsync(rec_dir.dentry);
if (status)
printk("NFSD: Failed to remove expired client state directory"
" %.*s\n", HEXDIR_LEN, clp->cl_recdir);
return;
}
static int
purge_old(struct dentry *parent, struct dentry *child)
{
int status;
if (nfs4_has_reclaimed_state(child->d_name.name))
return nfs_ok;
status = nfsd4_clear_clid_dir(parent, child);
if (status)
printk("failed to remove client recovery directory %s\n",
child->d_name.name);
/* Keep trying, success or failure: */
return nfs_ok;
}
void
nfsd4_recdir_purge_old(void) {
int status;
if (!rec_dir_init)
return;
status = nfsd4_list_rec_dir(rec_dir.dentry, purge_old);
if (status == 0)
status = nfsd4_rec_fsync(rec_dir.dentry);
if (status)
printk("nfsd4: failed to purge old clients from recovery"
" directory %s\n", rec_dir.dentry->d_name.name);
return;
}
static int
load_recdir(struct dentry *parent, struct dentry *child)
{
......
......@@ -905,6 +905,7 @@ nfsd4_setclientid_confirm(struct svc_rqst *rqstp, struct nfsd4_setclientid_confi
conf = find_confirmed_client_by_str(unconf->cl_recdir,
hash);
if (conf) {
nfsd4_remove_clid_dir(conf);
expire_client(conf);
}
move_to_confirmed(unconf);
......@@ -1691,6 +1692,7 @@ nfs4_set_claim_prev(struct nfsd4_open *open, int *status)
*status = nfserr_reclaim_bad;
else {
open->op_stateowner->so_confirmed = 1;
open->op_stateowner->so_client->cl_firststate = 1;
open->op_stateowner->so_seqid--;
}
}
......@@ -1903,6 +1905,7 @@ static void
end_grace(void)
{
dprintk("NFSD: end of grace period\n");
nfsd4_recdir_purge_old();
in_grace = 0;
}
......@@ -1932,6 +1935,7 @@ nfs4_laundromat(void)
}
dprintk("NFSD: purging unused client (clientid %08x)\n",
clp->cl_clientid.cl_id);
nfsd4_remove_clid_dir(clp);
expire_client(clp);
}
INIT_LIST_HEAD(&reaplist);
......@@ -2320,6 +2324,8 @@ nfsd4_open_confirm(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfs
stp->st_stateid.si_stateownerid,
stp->st_stateid.si_fileid,
stp->st_stateid.si_generation);
nfsd4_create_clid_dir(sop->so_client);
out:
if (oc->oc_stateowner)
nfs4_get_stateowner(oc->oc_stateowner);
......@@ -3089,6 +3095,16 @@ alloc_reclaim(void)
return kmalloc(sizeof(struct nfs4_client_reclaim), GFP_KERNEL);
}
int
nfs4_has_reclaimed_state(const char *name)
{
unsigned int strhashval = clientstr_hashval(name);
struct nfs4_client *clp;
clp = find_confirmed_client_by_str(name, strhashval);
return clp ? 1 : 0;
}
/*
* failure => all reset bets are off, nfserr_no_grace...
*/
......
......@@ -131,6 +131,7 @@ struct nfs4_client {
nfs4_verifier cl_confirm; /* generated by server */
struct nfs4_callback cl_callback; /* callback info */
atomic_t cl_count; /* ref count */
u32 cl_firststate; /* recovery dir creation */
};
/* struct nfs4_client_reset
......@@ -282,6 +283,10 @@ extern void nfsd4_init_recdir(char *recdir_name);
extern int nfsd4_recdir_load(void);
extern void nfsd4_shutdown_recdir(void);
extern int nfs4_client_to_reclaim(const char *name);
extern int nfs4_has_reclaimed_state(const char *name);
extern void nfsd4_recdir_purge_old(void);
extern int nfsd4_create_clid_dir(struct nfs4_client *clp);
extern void nfsd4_remove_clid_dir(struct nfs4_client *clp);
static inline void
nfs4_put_stateowner(struct nfs4_stateowner *so)
......
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