From 70c3b76c28b012452d63bb27f6d0517afb05d86f Mon Sep 17 00:00:00 2001 From: NeilBrown Date: Mon, 7 Nov 2005 01:00:25 -0800 Subject: [PATCH] knfsd: Allow run-time selection of NFS versions to export Provide a file in the NFSD filesystem that allows setting and querying of which version of NFS are being exported. Changes are only allowed while no server is running. Signed-off-by: Steve Dickson Signed-off-by: Neil Brown Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- fs/nfsd/nfsctl.c | 82 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 82 insertions(+) (limited to 'fs/nfsd/nfsctl.c') diff --git a/fs/nfsd/nfsctl.c b/fs/nfsd/nfsctl.c index 2a99a0bf54f6..a0871b3efeb7 100644 --- a/fs/nfsd/nfsctl.c +++ b/fs/nfsd/nfsctl.c @@ -23,6 +23,7 @@ #include #include #include +#include #include #include @@ -35,6 +36,8 @@ #include +unsigned int nfsd_versbits = ~0; + /* * We have a single directory with 9 nodes in it. */ @@ -50,8 +53,15 @@ enum { NFSD_List, NFSD_Fh, NFSD_Threads, + NFSD_Versions, + /* + * 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_RecoveryDir, +#endif }; /* @@ -66,8 +76,11 @@ static ssize_t write_getfd(struct file *file, char *buf, size_t size); static ssize_t write_getfs(struct file *file, char *buf, size_t size); static ssize_t write_filehandle(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_versions(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_recoverydir(struct file *file, char *buf, size_t size); +#endif static ssize_t (*write_op[])(struct file *, char *, size_t) = { [NFSD_Svc] = write_svc, @@ -79,8 +92,11 @@ static ssize_t (*write_op[])(struct file *, char *, size_t) = { [NFSD_Getfs] = write_getfs, [NFSD_Fh] = write_filehandle, [NFSD_Threads] = write_threads, + [NFSD_Versions] = write_versions, +#ifdef CONFIG_NFSD_V4 [NFSD_Leasetime] = write_leasetime, [NFSD_RecoveryDir] = write_recoverydir, +#endif }; static ssize_t nfsctl_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos) @@ -343,6 +359,70 @@ static ssize_t write_threads(struct file *file, char *buf, size_t size) return strlen(buf); } +static ssize_t write_versions(struct file *file, char *buf, size_t size) +{ + /* + * Format: + * [-/+]vers [-/+]vers ... + */ + char *mesg = buf; + char *vers, sign; + int len, num; + ssize_t tlen = 0; + char *sep; + + if (size>0) { + if (nfsd_serv) + 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), NULL, 0); + else + num = simple_strtol(vers, NULL, 0); + switch(num) { + case 2: + case 3: + case 4: + if (sign != '-') + NFSCTL_VERSET(nfsd_versbits, num); + else + NFSCTL_VERUNSET(nfsd_versbits, num); + break; + default: + return -EINVAL; + } + vers += len + 1; + tlen += len; + } while ((len = qword_get(&mesg, vers, size)) > 0); + /* If all get turned off, turn them back on, as + * having no versions is BAD + */ + if ((nfsd_versbits & NFSCTL_VERALL)==0) + nfsd_versbits = NFSCTL_VERALL; + } + /* Now write current state into reply buffer */ + len = 0; + sep = ""; + for (num=2 ; num <= 4 ; num++) + if (NFSCTL_VERISSET(NFSCTL_VERALL, num)) { + len += sprintf(buf+len, "%s%c%d", sep, + NFSCTL_VERISSET(nfsd_versbits, num)?'+':'-', + num); + sep = " "; + } + len += sprintf(buf+len, "\n"); + return len; +} + +#ifdef CONFIG_NFSD_V4 extern time_t nfs4_leasetime(void); static ssize_t write_leasetime(struct file *file, char *buf, size_t size) @@ -384,6 +464,7 @@ static ssize_t write_recoverydir(struct file *file, char *buf, size_t size) status = nfs4_reset_recoverydir(recdir); return strlen(buf); } +#endif /*----------------------------------------------------------------------------*/ /* @@ -403,6 +484,7 @@ static int nfsd_fill_super(struct super_block * sb, void * data, int silent) [NFSD_List] = {"exports", &exports_operations, S_IRUGO}, [NFSD_Fh] = {"filehandle", &transaction_ops, S_IWUSR|S_IRUSR}, [NFSD_Threads] = {"threads", &transaction_ops, S_IWUSR|S_IRUSR}, + [NFSD_Versions] = {"versions", &transaction_ops, S_IWUSR|S_IRUSR}, #ifdef CONFIG_NFSD_V4 [NFSD_Leasetime] = {"nfsv4leasetime", &transaction_ops, S_IWUSR|S_IRUSR}, [NFSD_RecoveryDir] = {"nfsv4recoverydir", &transaction_ops, S_IWUSR|S_IRUSR}, -- cgit v1.2.3