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author | NeilBrown <neilb@cse.unsw.edu.au> | 2005-11-07 09:00:25 (GMT) |
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committer | Linus Torvalds <torvalds@g5.osdl.org> | 2005-11-07 15:53:48 (GMT) |
commit | 70c3b76c28b012452d63bb27f6d0517afb05d86f (patch) | |
tree | 836c24891039fde8a59ee5db37def144bce16b90 /fs/nfsd/nfsctl.c | |
parent | 7390022d697bcc62a7556d6fdc61ec56ce3a381a (diff) | |
download | linux-fsl-qoriq-70c3b76c28b012452d63bb27f6d0517afb05d86f.tar.xz |
[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 <steved@redhat.com>
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'fs/nfsd/nfsctl.c')
-rw-r--r-- | fs/nfsd/nfsctl.c | 82 |
1 files changed, 82 insertions, 0 deletions
diff --git a/fs/nfsd/nfsctl.c b/fs/nfsd/nfsctl.c index 2a99a0b..a0871b3 100644 --- a/fs/nfsd/nfsctl.c +++ b/fs/nfsd/nfsctl.c @@ -23,6 +23,7 @@ #include <linux/seq_file.h> #include <linux/pagemap.h> #include <linux/init.h> +#include <linux/string.h> #include <linux/nfs.h> #include <linux/nfsd_idmap.h> @@ -35,6 +36,8 @@ #include <asm/uaccess.h> +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}, |