955a857e06
This patch creates a new idmapper system that uses the request-key function to place a call into userspace to map user and group ids to names. The old idmapper was single threaded, which prevented more than one request from running at a single time. This means that a user would have to wait for an upcall to finish before accessing a cached result. The upcall result is stored on a keyring of type id_resolver. See the file Documentation/filesystems/nfs/idmapper.txt for instructions. Signed-off-by: Bryan Schumaker <bjschuma@netapp.com> [Trond: fix up the return value of nfs_idmap_lookup_name and clean up code] Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
93 lines
1.9 KiB
C
93 lines
1.9 KiB
C
/*
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* linux/fs/nfs/sysctl.c
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*
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* Sysctl interface to NFS parameters
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*/
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#include <linux/types.h>
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#include <linux/linkage.h>
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#include <linux/ctype.h>
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#include <linux/fs.h>
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#include <linux/sysctl.h>
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#include <linux/module.h>
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#include <linux/nfs4.h>
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#include <linux/nfs_idmap.h>
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#include <linux/nfs_fs.h>
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#include "callback.h"
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#ifdef CONFIG_NFS_V4
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static const int nfs_set_port_min = 0;
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static const int nfs_set_port_max = 65535;
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#endif
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static struct ctl_table_header *nfs_callback_sysctl_table;
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static ctl_table nfs_cb_sysctls[] = {
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#ifdef CONFIG_NFS_V4
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{
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.procname = "nfs_callback_tcpport",
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.data = &nfs_callback_set_tcpport,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = proc_dointvec_minmax,
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.extra1 = (int *)&nfs_set_port_min,
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.extra2 = (int *)&nfs_set_port_max,
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},
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#ifndef CONFIG_NFS_USE_NEW_IDMAPPER
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{
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.procname = "idmap_cache_timeout",
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.data = &nfs_idmap_cache_timeout,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = proc_dointvec_jiffies,
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},
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#endif /* CONFIG_NFS_USE_NEW_IDMAPPER */
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#endif
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{
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.procname = "nfs_mountpoint_timeout",
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.data = &nfs_mountpoint_expiry_timeout,
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.maxlen = sizeof(nfs_mountpoint_expiry_timeout),
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.mode = 0644,
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.proc_handler = proc_dointvec_jiffies,
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},
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{
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.procname = "nfs_congestion_kb",
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.data = &nfs_congestion_kb,
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.maxlen = sizeof(nfs_congestion_kb),
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.mode = 0644,
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.proc_handler = proc_dointvec,
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},
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{ }
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};
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static ctl_table nfs_cb_sysctl_dir[] = {
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{
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.procname = "nfs",
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.mode = 0555,
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.child = nfs_cb_sysctls,
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},
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{ }
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};
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static ctl_table nfs_cb_sysctl_root[] = {
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{
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.procname = "fs",
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.mode = 0555,
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.child = nfs_cb_sysctl_dir,
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},
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{ }
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};
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int nfs_register_sysctl(void)
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{
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nfs_callback_sysctl_table = register_sysctl_table(nfs_cb_sysctl_root);
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if (nfs_callback_sysctl_table == NULL)
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return -ENOMEM;
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return 0;
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}
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void nfs_unregister_sysctl(void)
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{
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unregister_sysctl_table(nfs_callback_sysctl_table);
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nfs_callback_sysctl_table = NULL;
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}
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