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nfsd: new interface to advertise export features 

Soon we will add the new V4ROOT flag, and allow the INSECURE flag to
vary by pseudoflavor.  It would be useful for nfs-utils (for example,
for improved exportfs error reporting) to be able to know when this
happens.  Use this new interface for that purpose.

Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
This commit is contained in:
J. Bruce Fields 2009-12-14 12:53:32 -05:00
parent 9a74af2133
commit e8e8753f7a
2 changed files with 23 additions and 1 deletions
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21
fs/nfsd/nfsctl.c
View File

@ -31,6 +31,7 @@ enum {
NFSD_Getfd,
NFSD_Getfs,
NFSD_List,
NFSD_Export_features,
NFSD_Fh,
NFSD_FO_UnlockIP,
NFSD_FO_UnlockFS,
@ -149,6 +150,24 @@ static const struct file_operations exports_operations = {
.owner = THIS_MODULE,
};
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;
}
static int export_features_open(struct inode *inode, struct file *file)
{
return single_open(file, export_features_show, NULL);
}
static struct file_operations export_features_operations = {
.open = export_features_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
extern int nfsd_pool_stats_open(struct inode *inode, struct file *file);
extern int nfsd_pool_stats_release(struct inode *inode, struct file *file);
@ -1306,6 +1325,8 @@ static int nfsd_fill_super(struct super_block * sb, void * data, int silent)
[NFSD_Getfd] = {".getfd", &transaction_ops, S_IWUSR|S_IRUSR},
[NFSD_Getfs] = {".getfs", &transaction_ops, S_IWUSR|S_IRUSR},
[NFSD_List] = {"exports", &exports_operations, S_IRUGO},
[NFSD_Export_features] = {"export_features",
&export_features_operations, S_IRUGO},
[NFSD_FO_UnlockIP] = {"unlock_ip",
&transaction_ops, S_IWUSR|S_IRUSR},
[NFSD_FO_UnlockFS] = {"unlock_filesystem",

3
include/linux/nfsd/export.h
View File

@ -39,7 +39,8 @@
#define NFSEXP_FSID 0x2000
#define NFSEXP_CROSSMOUNT 0x4000
#define NFSEXP_NOACL 0x8000 /* reserved for possible ACL related use */
#define NFSEXP_ALLFLAGS 0xFE3F
/* All flags that we claim to support. (Note we don't support NOACL.) */
#define NFSEXP_ALLFLAGS 0x7E3F
/* The flags that may vary depending on security flavor: */
#define NFSEXP_SECINFO_FLAGS (NFSEXP_READONLY | NFSEXP_ROOTSQUASH \