cregit-Linux how code gets into the kernel

Release 4.10 fs/nfsd/nfsctl.c

Directory: fs/nfsd
/*
 * Syscall interface to knfsd.
 *
 * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
 */

#include <linux/slab.h>
#include <linux/namei.h>
#include <linux/ctype.h>

#include <linux/sunrpc/svcsock.h>
#include <linux/lockd/lockd.h>
#include <linux/sunrpc/addr.h>
#include <linux/sunrpc/gss_api.h>
#include <linux/sunrpc/gss_krb5_enctypes.h>
#include <linux/sunrpc/rpc_pipe_fs.h>
#include <linux/module.h>

#include "idmap.h"
#include "nfsd.h"
#include "cache.h"
#include "state.h"
#include "netns.h"
#include "pnfs.h"

/*
 *      We have a single directory with several nodes in it.
 */
enum {
	
NFSD_Root = 1,
	
NFSD_List,
	
NFSD_Export_features,
	
NFSD_Fh,
	
NFSD_FO_UnlockIP,
	
NFSD_FO_UnlockFS,
	
NFSD_Threads,
	
NFSD_Pool_Threads,
	
NFSD_Pool_Stats,
	
NFSD_Reply_Cache_Stats,
	
NFSD_Versions,
	
NFSD_Ports,
	
NFSD_MaxBlkSize,
	
NFSD_MaxConnections,
	
NFSD_SupportedEnctypes,
	/*
         * The below MUST come last.  Otherwise we leave a hole in nfsd_files[]
         * with !CONFIG_NFSD_V4 and simple_fill_super() goes oops
         */
#ifdef CONFIG_NFSD_V4
	
NFSD_Leasetime,
	
NFSD_Gracetime,
	
NFSD_RecoveryDir,
	
NFSD_V4EndGrace,
#endif
};

/*
 * write() for these nodes.
 */
static ssize_t write_filehandle(struct file *file, char *buf, size_t size);
static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size);
static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size);
static ssize_t write_threads(struct file *file, char *buf, size_t size);
static ssize_t write_pool_threads(struct file *file, char *buf, size_t size);
static ssize_t write_versions(struct file *file, char *buf, size_t size);
static ssize_t write_ports(struct file *file, char *buf, size_t size);
static ssize_t write_maxblksize(struct file *file, char *buf, size_t size);
static ssize_t write_maxconn(struct file *file, char *buf, size_t size);
#ifdef CONFIG_NFSD_V4
static ssize_t write_leasetime(struct file *file, char *buf, size_t size);
static ssize_t write_gracetime(struct file *file, char *buf, size_t size);
static ssize_t write_recoverydir(struct file *file, char *buf, size_t size);
static ssize_t write_v4_end_grace(struct file *file, char *buf, size_t size);
#endif


static ssize_t (*write_op[])(struct file *, char *, size_t) = {
	[NFSD_Fh] = write_filehandle,
	[NFSD_FO_UnlockIP] = write_unlock_ip,
	[NFSD_FO_UnlockFS] = write_unlock_fs,
	[NFSD_Threads] = write_threads,
	[NFSD_Pool_Threads] = write_pool_threads,
	[NFSD_Versions] = write_versions,
	[NFSD_Ports] = write_ports,
	[NFSD_MaxBlkSize] = write_maxblksize,
	[NFSD_MaxConnections] = write_maxconn,
#ifdef CONFIG_NFSD_V4
	[NFSD_Leasetime] = write_leasetime,
	[NFSD_Gracetime] = write_gracetime,
	[NFSD_RecoveryDir] = write_recoverydir,
	[NFSD_V4EndGrace] = write_v4_end_grace,
#endif

}; static ssize_t nfsctl_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos) { ino_t ino = file_inode(file)->i_ino; char *data; ssize_t rv; if (ino >= ARRAY_SIZE(write_op) || !write_op[ino]) return -EINVAL; data = simple_transaction_get(file, buf, size); if (IS_ERR(data)) return PTR_ERR(data); rv = write_op[ino](file, data, size); if (rv >= 0) { simple_transaction_set(file, rv); rv = size; } return rv; }

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al viroal viro6049.59%444.44%
neil brownneil brown3831.40%222.22%
james morrisjames morris1512.40%111.11%
pre-gitpre-git75.79%111.11%
tobias klausertobias klauser10.83%111.11%
Total121100.00%9100.00%


static ssize_t nfsctl_transaction_read(struct file *file, char __user *buf, size_t size, loff_t *pos) { if (! file->private_data) { /* An attempt to read a transaction file without writing * causes a 0-byte write so that the file can return * state information */ ssize_t rv = nfsctl_transaction_write(file, buf, 0, pos); if (rv < 0) return rv; } return simple_transaction_read(file, buf, size, pos); }

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neil brownneil brown68100.00%1100.00%
Total68100.00%1100.00%

static const struct file_operations transaction_ops = { .write = nfsctl_transaction_write, .read = nfsctl_transaction_read, .release = simple_transaction_release, .llseek = default_llseek, };
static int exports_net_open(struct net *net, struct file *file) { int err; struct seq_file *seq; struct nfsd_net *nn = net_generic(net, nfsd_net_id); err = seq_open(file, &nfs_exports_op); if (err) return err; seq = file->private_data; seq->private = nn->svc_export_cache; return 0; }

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stanislav kinsburskystanislav kinsbursky4970.00%350.00%
al viroal viro1014.29%116.67%
neil brownneil brown710.00%116.67%
pre-gitpre-git45.71%116.67%
Total70100.00%6100.00%


static int exports_proc_open(struct inode *inode, struct file *file) { return exports_net_open(current->nsproxy->net_ns, file); }

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stanislav kinsburskystanislav kinsbursky28100.00%1100.00%
Total28100.00%1100.00%

static const struct file_operations exports_proc_operations = { .open = exports_proc_open, .read = seq_read, .llseek = seq_lseek, .release = seq_release, };
static int exports_nfsd_open(struct inode *inode, struct file *file) { return exports_net_open(inode->i_sb->s_fs_info, file); }

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stanislav kinsburskystanislav kinsbursky28100.00%1100.00%
Total28100.00%1100.00%

static const struct file_operations exports_nfsd_operations = { .open = exports_nfsd_open, .read = seq_read, .llseek = seq_lseek, .release = seq_release, };
static int export_features_show(struct seq_file *m, void *v) { seq_printf(m, "0x%x 0x%x\n", NFSEXP_ALLFLAGS, NFSEXP_SECINFO_FLAGS); return 0; }

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j. bruce fieldsj. bruce fields29100.00%1100.00%
Total29100.00%1100.00%


static int export_features_open(struct inode *inode, struct file *file) { return single_open(file, export_features_show, NULL); }

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j. bruce fieldsj. bruce fields26100.00%1100.00%
Total26100.00%1100.00%

static const struct file_operations export_features_operations = { .open = export_features_open, .read = seq_read, .llseek = seq_lseek, .release = single_release, }; #if defined(CONFIG_SUNRPC_GSS) || defined(CONFIG_SUNRPC_GSS_MODULE)
static int supported_enctypes_show(struct seq_file *m, void *v) { seq_printf(m, KRB5_SUPPORTED_ENCTYPES); return 0; }

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neil brownneil brown2080.00%150.00%
pre-gitpre-git520.00%150.00%
Total25100.00%2100.00%


static int supported_enctypes_open(struct inode *inode, struct file *file) { return single_open(file, supported_enctypes_show, NULL); }

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neil brownneil brown2076.92%125.00%
pre-gitpre-git519.23%250.00%
al viroal viro13.85%125.00%
Total26100.00%4100.00%

static const struct file_operations supported_enctypes_ops = { .open = supported_enctypes_open, .read = seq_read, .llseek = seq_lseek, .release = single_release, }; #endif /* CONFIG_SUNRPC_GSS or CONFIG_SUNRPC_GSS_MODULE */ static const struct file_operations pool_stats_operations = { .open = nfsd_pool_stats_open, .read = seq_read, .llseek = seq_lseek, .release = nfsd_pool_stats_release, }; static const struct file_operations reply_cache_stats_operations = { .open = nfsd_reply_cache_stats_open, .read = seq_read, .llseek = seq_lseek, .release = single_release, }; /*----------------------------------------------------------------------------*/ /* * payload - write methods */
static inline struct net *netns(struct file *file) { return file_inode(file)->i_sb->s_fs_info; }

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al viroal viro24100.00%1100.00%
Total24100.00%1100.00%

/** * write_unlock_ip - Release all locks used by a client * * Experimental. * * Input: * buf: '\n'-terminated C string containing a * presentation format IP address * size: length of C string in @buf * Output: * On success: returns zero if all specified locks were released; * returns one if one or more locks were not released * On error: return code is negative errno value */
static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size) { struct sockaddr_storage address; struct sockaddr *sap = (struct sockaddr *)&address; size_t salen = sizeof(address); char *fo_path; struct net *net = netns(file); /* sanity check */ if (size == 0) return -EINVAL; if (buf[size-1] != '\n') return -EINVAL; fo_path = buf; if (qword_get(&buf, fo_path, size) < 0) return -EINVAL; if (rpc_pton(net, fo_path, size, sap, salen) == 0) return -EINVAL; return nlmsvc_unlock_all_by_ip(sap); }

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wendy chengwendy cheng8060.61%114.29%
chuck leverchuck lever4030.30%342.86%
stanislav kinsburskystanislav kinsbursky96.82%228.57%
al viroal viro32.27%114.29%
Total132100.00%7100.00%

/** * write_unlock_fs - Release all locks on a local file system * * Experimental. * * Input: * buf: '\n'-terminated C string containing the * absolute pathname of a local file system * size: length of C string in @buf * Output: * On success: returns zero if all specified locks were released; * returns one if one or more locks were not released * On error: return code is negative errno value */
static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size) { struct path path; char *fo_path; int error; /* sanity check */ if (size == 0) return -EINVAL; if (buf[size-1] != '\n') return -EINVAL; fo_path = buf; if (qword_get(&buf, fo_path, size) < 0) return -EINVAL; error = kern_path(fo_path, 0, &path); if (error) return error; /* * XXX: Needs better sanity checking. Otherwise we could end up * releasing locks on the wrong file system. * * For example: * 1. Does the path refer to a directory? * 2. Is that directory a mount point, or * 3. Is that directory the root of an exported file system? */ error = nlmsvc_unlock_all_by_sb(path.dentry->d_sb); path_put(&path); return error; }

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wendy chengwendy cheng10993.16%120.00%
al viroal viro65.13%240.00%
chuck leverchuck lever21.71%240.00%
Total117100.00%5100.00%

/** * write_filehandle - Get a variable-length NFS file handle by path * * On input, the buffer contains a '\n'-terminated C string comprised of * three alphanumeric words separated by whitespace. The string may * contain escape sequences. * * Input: * buf: * domain: client domain name * path: export pathname * maxsize: numeric maximum size of * @buf * size: length of C string in @buf * Output: * On success: passed-in buffer filled with '\n'-terminated C * string containing a ASCII hex text version * of the NFS file handle; * return code is the size in bytes of the string * On error: return code is negative errno value */
static ssize_t write_filehandle(struct file *file, char *buf, size_t size) { char *dname, *path; int uninitialized_var(maxsize); char *mesg = buf; int len; struct auth_domain *dom; struct knfsd_fh fh; if (size == 0) return -EINVAL; if (buf[size-1] != '\n') return -EINVAL; buf[size-1] = 0; dname = mesg; len = qword_get(&mesg, dname, size); if (len <= 0) return -EINVAL; path = dname+len+1; len = qword_get(&mesg, path, size); if (len <= 0) return -EINVAL; len = get_int(&mesg, &maxsize); if (len) return len; if (maxsize < NFS_FHSIZE) return -EINVAL; maxsize = min(maxsize, NFS3_FHSIZE); if (qword_get(&mesg, mesg, size)>0) return -EINVAL; /* we have all the words, they are in buf.. */ dom = unix_domain_find(dname); if (!dom) return -ENOMEM; len = exp_rootfh(netns(file), dom, path, &fh, maxsize); auth_domain_put(dom); if (len) return len; mesg = buf; len = SIMPLE_TRANSACTION_LIMIT; qword_addhex(&mesg, &len, (char*)&fh.fh_base, fh.fh_size); mesg[-1] = '\n'; return mesg - buf; }

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neil brownneil brown26191.58%114.29%
j. bruce fieldsj. bruce fields103.51%114.29%
kinglong meekinglong mee51.75%114.29%
al viroal viro41.40%114.29%
andrew mortonandrew morton31.05%114.29%
stanislav kinsburskystanislav kinsbursky10.35%114.29%
james morrisjames morris10.35%114.29%
Total285100.00%7100.00%

/** * write_threads - Start NFSD, or report the current number of running threads * * Input: * buf: ignored * size: zero * Output: * On success: passed-in buffer filled with '\n'-terminated C * string numeric value representing the number of * running NFSD threads; * return code is the size in bytes of the string * On error: return code is zero * * OR * * Input: * buf: C string containing an unsigned * integer value representing the * number of NFSD threads to start * size: non-zero length of C string in @buf * Output: * On success: NFS service is started; * passed-in buffer filled with '\n'-terminated C * string numeric value representing the number of * running NFSD threads; * return code is the size in bytes of the string * On error: return code is zero or a negative errno value */
static ssize_t write_threads(struct file *file, char *buf, size_t size) { char *mesg = buf; int rv; struct net *net = netns(file); if (size > 0) { int newthreads; rv = get_int(&mesg, &newthreads); if (rv) return rv; if (newthreads < 0) return -EINVAL; rv = nfsd_svc(newthreads, net); if (rv < 0) return rv; } else rv = nfsd_nrthreads(net); return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n", rv); }

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neil brownneil brown9583.33%228.57%
stanislav kinsburskystanislav kinsbursky1210.53%342.86%
chuck leverchuck lever43.51%114.29%
al viroal viro32.63%114.29%
Total114100.00%7100.00%

/** * write_pool_threads - Set or report the current number of threads per pool * * Input: * buf: ignored * size: zero * * OR * * Input: * buf: C string containing whitespace- * separated unsigned integer values * representing the number of NFSD * threads to start in each pool * size: non-zero length of C string in @buf * Output: * On success: passed-in buffer filled with '\n'-terminated C * string containing integer values representing the * number of NFSD threads in each pool; * return code is the size in bytes of the string * On error: return code is zero or a negative errno value */
static ssize_t write_pool_threads(struct file *file, char *buf, size_t size) { /* if size > 0, look for an array of number of threads per node * and apply them then write out number of threads per node as reply */ char *mesg = buf; int i; int rv; int len; int npools; int *nthreads; struct net *net = netns(file); mutex_lock(&nfsd_mutex); npools = nfsd_nrpools(net); if (npools == 0) { /* * NFS is shut down. The admin can start it by * writing to the threads file but NOT the pool_threads * file, sorry. Report zero threads. */ mutex_unlock(&nfsd_mutex); strcpy(buf, "0\n"); return strlen(buf); } nthreads = kcalloc(npools, sizeof(int), GFP_KERNEL); rv = -ENOMEM; if (nthreads == NULL) goto out_free; if (size > 0) { for (i = 0; i < npools; i++) { rv = get_int(&mesg, &nthreads[i]); if (rv == -ENOENT) break; /* fewer numbers than pools */ if (rv) goto out_free; /* syntax error */ rv = -EINVAL; if (nthreads[i] < 0) goto out_free; } rv = nfsd_set_nrthreads(i, nthreads, net); if (rv) goto out_free; } rv = nfsd_get_nrthreads(npools, nthreads, net); if (rv) goto out_free; mesg = buf; size = SIMPLE_TRANSACTION_LIMIT; for (i = 0; i < npools && size > 0; i++) { snprintf(mesg, size, "%d%c", nthreads[i], (i == npools-1 ? '\n' : ' ')); len = strlen(mesg); size -= len; mesg += len; } rv = mesg - buf; out_free: kfree(nthreads); mutex_unlock(&nfsd_mutex); return rv; }

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greg banksgreg banks26784.23%114.29%
neil brownneil brown309.46%114.29%
stanislav kinsburskystanislav kinsbursky144.42%342.86%
al viroal viro30.95%114.29%
j. bruce fieldsj. bruce fields30.95%114.29%
Total317100.00%7100.00%


static ssize_t __write_versions(struct file *file, char *buf, size_t size) { char *mesg = buf; char *vers, *minorp, sign; int len, num, remaining; unsigned minor; ssize_t tlen = 0; char *sep; struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id); if (size>0) { if (nn->nfsd_serv) /* Cannot change versions without updating * nn->nfsd_serv->sv_xdrsize, and reallocing * rq_argp and rq_resp */ return -EBUSY; if (buf[size-1] != '\n') return -EINVAL; buf[size-1] = 0; vers = mesg; len = qword_get(&mesg, vers, size); if (len <= 0) return -EINVAL; do { sign = *vers; if (sign == '+' || sign == '-') num = simple_strtol((vers+1), &minorp, 0); else num = simple_strtol(vers, &minorp, 0); if (*minorp == '.') { if (num != 4) return -EINVAL; minor = simple_strtoul(minorp+1, NULL, 0); if (minor == 0) return -EINVAL; if (nfsd_minorversion(minor, sign == '-' ? NFSD_CLEAR : NFSD_SET) < 0) return -EINVAL; goto next; } switch(num) { case 2: case 3: case 4: nfsd_vers(num, sign == '-' ? NFSD_CLEAR : NFSD_SET); break; default: return -EINVAL; } next: vers += len + 1; } while ((len = qword_get(&mesg, vers, size)) > 0); /* If all get turned off, turn them back on, as * having no versions is BAD */ nfsd_reset_versions(); } /* Now write current state into reply buffer */ len = 0; sep = ""; remaining = SIMPLE_TRANSACTION_LIMIT; for (num=2 ; num <= 4 ; num++) if (nfsd_vers(num, NFSD_AVAIL)) { len = snprintf(buf, remaining, "%s%c%d", sep, nfsd_vers(num, NFSD_TEST)?'+':'-', num); sep = " "; if (len >= remaining) break; remaining -= len; buf += len; tlen += len; } if (nfsd_vers(4, NFSD_AVAIL)) for (minor = 1; minor <= NFSD_SUPPORTED_MINOR_VERSION; minor++) { len = snprintf(buf, remaining, " %c4.%u", (nfsd_vers(4, NFSD_TEST) && nfsd_minorversion(minor, NFSD_TEST)) ? '+' : '-', minor); if (len >= remaining) break; remaining -= len; buf += len; tlen += len; } len = snprintf(buf, remaining, "\n"); if (len >= remaining) return -EINVAL; return tlen + len; }

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neil brownneil brown28656.97%222.22%
benny halevybenny halevy12725.30%111.11%
chuck leverchuck lever6613.15%111.11%
stanislav kinsburskystanislav kinsbursky142.79%111.11%
al viroal viro40.80%111.11%
dan carpenterdan carpenter30.60%111.11%
jeff laytonjeff layton10.20%111.11%
j. bruce fieldsj. bruce fields10.20%111.11%
Total502100.00%9100.00%

/** * write_versions - Set or report the available NFS protocol versions * * Input: * buf: ignored * size: zero * Output: * On success: passed-in buffer filled with '\n'-terminated C * string containing positive or negative integer * values representing the current status of each * protocol version; * return code is the size in bytes of the string * On error: return code is zero or a negative errno value * * OR * * Input: * buf: C string containing whitespace- * separated positive or negative * integer values representing NFS * protocol versions to enable ("+n") * or disable ("-n") * size: non-zero length of C string in @buf * Output: * On success: status of zero or more protocol versions has * been updated; passed-in buffer filled with * '\n'-terminated C string containing positive * or negative integer values representing the * current status of each protocol version; * return code is the size in bytes of the string * On error: return code is zero or a negative errno value */
static ssize_t write_versions(struct file *file, char *buf, size_t size) { ssize_t rv; mutex_lock(&nfsd_mutex); rv = __write_versions(file, buf, size); mutex_unlock(&nfsd_mutex); return rv; }

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jeff laytonjeff layton47100.00%1100.00%
Total47100.00%1100.00%

/* * Zero-length write. Return a list of NFSD's current listener * transports. */
static ssize_t __write_ports_names(char *buf, struct net *net) { struct nfsd_net *nn = net_generic(net, nfsd_net_id); if (nn->nfsd_serv == NULL) return 0; return svc_xprt_names(nn->nfsd_serv, buf, SIMPLE_TRANSACTION_LIMIT); }

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chuck leverchuck lever2958.00%266.67%
stanislav kinsburskystanislav kinsbursky2142.00%133.33%
Total50100.00%3100.00%

/* * A single 'fd' number was written, in which case it must be for * a socket of a supported family/protocol, and we use it as an * nfsd listener. */
static ssize_t __write_ports_addfd(char *buf, struct net *net) { char *mesg = buf; int fd, err; struct nfsd_net *nn = net_generic(net, nfsd_net_id); err = get_int(&mesg, &fd); if (err != 0 || fd < 0) return -EINVAL; if (svc_alien_sock(net, fd)) { printk(KERN_ERR "%s: socket net is different to NFSd's one\n", __func__); return -EINVAL; } err = nfsd_create_serv(net); if (err != 0) return err; err = svc_addsock(nn->nfsd_serv, fd, buf, SIMPLE_TRANSACTION_LIMIT); if (err < 0) { nfsd_destroy(net); return err; } /* Decrease the count, but don't shut down the service */ nn->nfsd_serv->sv_nrthreads--; return err; }

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chuck leverchuck lever8760.42%330.00%
stanislav kinsburskystanislav kinsbursky5236.11%660.00%
jeff laytonjeff layton53.47%110.00%
Total144100.00%10100.00%

/* * A transport listener is added by writing it's transport name and * a port number. */
static ssize_t __write_ports_addxprt(char *buf, struct net *net) { char transport[16]; struct svc_xprt *xprt; int