mirror of https://gitee.com/openkylin/linux.git
[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: Andy Adamson <andros@citi.umich.edu> Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu> Signed-off-by: Neil Brown <neilb@cse.unsw.edu.au> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
NeilBrown
Linus Torvalds
parent
190e4fbf96
commit
c7b9a45927
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@ -120,6 +120,70 @@ nfs4_make_rec_clidname(char *dname, struct xdr_netobj *clname)
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return status;
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}
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static int
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nfsd4_rec_fsync(struct dentry *dentry)
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{
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struct file *filp;
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int status = nfs_ok;
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dprintk("NFSD: nfs4_fsync_rec_dir\n");
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filp = dentry_open(dget(dentry), mntget(rec_dir.mnt), O_RDWR);
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if (IS_ERR(filp)) {
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status = PTR_ERR(filp);
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goto out;
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}
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if (filp->f_op && filp->f_op->fsync)
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status = filp->f_op->fsync(filp, filp->f_dentry, 0);
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fput(filp);
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out:
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if (status)
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printk("nfsd4: unable to sync recovery directory\n");
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return status;
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}
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int
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nfsd4_create_clid_dir(struct nfs4_client *clp)
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{
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char *dname = clp->cl_recdir;
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struct dentry *dentry;
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uid_t uid;
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gid_t gid;
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int status;
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dprintk("NFSD: nfsd4_create_clid_dir for \"%s\"\n", dname);
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if (!rec_dir_init || clp->cl_firststate)
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return 0;
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nfs4_save_user(&uid, &gid);
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/* lock the parent */
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down(&rec_dir.dentry->d_inode->i_sem);
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dentry = lookup_one_len(dname, rec_dir.dentry, HEXDIR_LEN-1);
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if (IS_ERR(dentry)) {
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status = PTR_ERR(dentry);
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goto out_unlock;
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}
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status = -EEXIST;
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if (dentry->d_inode) {
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dprintk("NFSD: nfsd4_create_clid_dir: DIRECTORY EXISTS\n");
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goto out_put;
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}
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status = vfs_mkdir(rec_dir.dentry->d_inode, dentry, S_IRWXU);
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out_put:
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dput(dentry);
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out_unlock:
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up(&rec_dir.dentry->d_inode->i_sem);
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if (status == 0) {
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clp->cl_firststate = 1;
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status = nfsd4_rec_fsync(rec_dir.dentry);
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}
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nfs4_reset_user(uid, gid);
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dprintk("NFSD: nfsd4_create_clid_dir returns %d\n", status);
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return status;
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}
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typedef int (recdir_func)(struct dentry *, struct dentry *);
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struct dentry_list {
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@ -201,6 +265,111 @@ nfsd4_list_rec_dir(struct dentry *dir, recdir_func *f)
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return status;
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}
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static int
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nfsd4_remove_clid_file(struct dentry *dir, struct dentry *dentry)
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{
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int status;
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if (!S_ISREG(dir->d_inode->i_mode)) {
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printk("nfsd4: non-file found in client recovery directory\n");
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return -EINVAL;
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}
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down(&dir->d_inode->i_sem);
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status = vfs_unlink(dir->d_inode, dentry);
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up(&dir->d_inode->i_sem);
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return status;
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}
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static int
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nfsd4_clear_clid_dir(struct dentry *dir, struct dentry *dentry)
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{
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int status;
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/* For now this directory should already be empty, but we empty it of
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* any regular files anyway, just in case the directory was created by
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* a kernel from the future.... */
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nfsd4_list_rec_dir(dentry, nfsd4_remove_clid_file);
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down(&dir->d_inode->i_sem);
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status = vfs_rmdir(dir->d_inode, dentry);
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up(&dir->d_inode->i_sem);
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return status;
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}
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static int
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nfsd4_unlink_clid_dir(char *name, int namlen)
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{
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struct dentry *dentry;
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int status;
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dprintk("NFSD: nfsd4_unlink_clid_dir. name %.*s\n", namlen, name);
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dentry = lookup_one_len(name, rec_dir.dentry, namlen);
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if (IS_ERR(dentry)) {
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status = PTR_ERR(dentry);
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return status;
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}
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status = -ENOENT;
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if (!dentry->d_inode)
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goto out;
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status = nfsd4_clear_clid_dir(rec_dir.dentry, dentry);
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out:
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dput(dentry);
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return status;
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}
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void
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nfsd4_remove_clid_dir(struct nfs4_client *clp)
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{
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uid_t uid;
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gid_t gid;
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int status;
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if (!rec_dir_init || !clp->cl_firststate)
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return;
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nfs4_save_user(&uid, &gid);
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status = nfsd4_unlink_clid_dir(clp->cl_recdir, HEXDIR_LEN-1);
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nfs4_reset_user(uid, gid);
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if (status == 0)
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status = nfsd4_rec_fsync(rec_dir.dentry);
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if (status)
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printk("NFSD: Failed to remove expired client state directory"
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" %.*s\n", HEXDIR_LEN, clp->cl_recdir);
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return;
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}
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static int
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purge_old(struct dentry *parent, struct dentry *child)
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{
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int status;
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if (nfs4_has_reclaimed_state(child->d_name.name))
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return nfs_ok;
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status = nfsd4_clear_clid_dir(parent, child);
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if (status)
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printk("failed to remove client recovery directory %s\n",
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child->d_name.name);
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/* Keep trying, success or failure: */
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return nfs_ok;
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}
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void
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nfsd4_recdir_purge_old(void) {
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int status;
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if (!rec_dir_init)
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return;
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status = nfsd4_list_rec_dir(rec_dir.dentry, purge_old);
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if (status == 0)
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status = nfsd4_rec_fsync(rec_dir.dentry);
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if (status)
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printk("nfsd4: failed to purge old clients from recovery"
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" directory %s\n", rec_dir.dentry->d_name.name);
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return;
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}
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static int
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load_recdir(struct dentry *parent, struct dentry *child)
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{
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@ -905,6 +905,7 @@ nfsd4_setclientid_confirm(struct svc_rqst *rqstp, struct nfsd4_setclientid_confi
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conf = find_confirmed_client_by_str(unconf->cl_recdir,
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hash);
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if (conf) {
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nfsd4_remove_clid_dir(conf);
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expire_client(conf);
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}
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move_to_confirmed(unconf);
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@ -1691,6 +1692,7 @@ nfs4_set_claim_prev(struct nfsd4_open *open, int *status)
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*status = nfserr_reclaim_bad;
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else {
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open->op_stateowner->so_confirmed = 1;
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open->op_stateowner->so_client->cl_firststate = 1;
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open->op_stateowner->so_seqid--;
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}
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}
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@ -1903,6 +1905,7 @@ static void
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end_grace(void)
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{
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dprintk("NFSD: end of grace period\n");
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nfsd4_recdir_purge_old();
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in_grace = 0;
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}
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@ -1932,6 +1935,7 @@ nfs4_laundromat(void)
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}
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dprintk("NFSD: purging unused client (clientid %08x)\n",
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clp->cl_clientid.cl_id);
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nfsd4_remove_clid_dir(clp);
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expire_client(clp);
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}
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INIT_LIST_HEAD(&reaplist);
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@ -2320,6 +2324,8 @@ nfsd4_open_confirm(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfs
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stp->st_stateid.si_stateownerid,
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stp->st_stateid.si_fileid,
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stp->st_stateid.si_generation);
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nfsd4_create_clid_dir(sop->so_client);
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out:
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if (oc->oc_stateowner)
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nfs4_get_stateowner(oc->oc_stateowner);
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@ -3089,6 +3095,16 @@ alloc_reclaim(void)
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return kmalloc(sizeof(struct nfs4_client_reclaim), GFP_KERNEL);
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}
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int
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nfs4_has_reclaimed_state(const char *name)
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{
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unsigned int strhashval = clientstr_hashval(name);
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struct nfs4_client *clp;
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clp = find_confirmed_client_by_str(name, strhashval);
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return clp ? 1 : 0;
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}
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/*
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* failure => all reset bets are off, nfserr_no_grace...
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*/
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@ -131,6 +131,7 @@ struct nfs4_client {
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nfs4_verifier cl_confirm; /* generated by server */
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struct nfs4_callback cl_callback; /* callback info */
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atomic_t cl_count; /* ref count */
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u32 cl_firststate; /* recovery dir creation */
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};
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/* struct nfs4_client_reset
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@ -282,6 +283,10 @@ extern void nfsd4_init_recdir(char *recdir_name);
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extern int nfsd4_recdir_load(void);
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extern void nfsd4_shutdown_recdir(void);
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extern int nfs4_client_to_reclaim(const char *name);
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extern int nfs4_has_reclaimed_state(const char *name);
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extern void nfsd4_recdir_purge_old(void);
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extern int nfsd4_create_clid_dir(struct nfs4_client *clp);
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extern void nfsd4_remove_clid_dir(struct nfs4_client *clp);
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static inline void
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nfs4_put_stateowner(struct nfs4_stateowner *so)
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