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orangefs: record userspace version for feature compatbility

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The client reports its version to the kernel on startup. We already test
that it is above the minimum version. Now we record it in a global
variable so code elsewhere can consult it before making a request the
client may not understand.

Signed-off-by: Martin Brandenburg <martin@omnibond.com>
This commit is contained in:
Martin Brandenburg 2016-08-09 15:59:26 -04:00
parent a21aae3bb1
commit f2ee3b7595
2 changed files with 12 additions and 0 deletions
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10
fs/orangefs/devorangefs-req.c
View File

@ -17,6 +17,8 @@
/* this file implements the /dev/pvfs2-req device node */
uint32_t userspace_version;
static int open_access_count;
#define DUMP_DEVICE_ERROR() \
@ -387,6 +389,13 @@ static ssize_t orangefs_devreq_write_iter(struct kiocb *iocb,
return -EPROTO;
}
if (!userspace_version) {
userspace_version = head.version;
} else if (userspace_version != head.version) {
gossip_err("Error: userspace version changes\n");
return -EPROTO;
}
/* remove the op from the in progress hash table */
op = orangefs_devreq_remove_op(head.tag);
if (!op) {
@ -527,6 +536,7 @@ static int orangefs_devreq_release(struct inode *inode, struct file *file)
gossip_debug(GOSSIP_DEV_DEBUG,
"pvfs2-client-core: device close complete\n");
open_access_count = 0;
userspace_version = 0;
mutex_unlock(&devreq_mutex);
return 0;
}

2
fs/orangefs/orangefs-kernel.h
View File

@ -506,6 +506,8 @@ ssize_t orangefs_inode_read(struct inode *inode,
/*
* defined in devorangefs-req.c
*/
extern uint32_t userspace_version;
int orangefs_dev_init(void);
void orangefs_dev_cleanup(void);
int is_daemon_in_service(void);