Commit 7a4439c4 authored by M. Mohan Kumar's avatar M. Mohan Kumar Committed by Eric Van Hensbergen
Browse files

9p: Include fsync support for 9p client 



Implement the fsync in the client side by marking stat field values to 'don't touch' so that server may 
interpret it as a request to guarantee that the contents of the associated file are committed to stable 
storage before the Rwstat message is returned.

Without this patch, calling fsync on a 9p file results in "Invalid argument" error. Please check the attached 
C program.

Signed-off-by: default avatarAneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: default avatarM. Mohan Kumar <mohan@in.ibm.com>
Acked-by: default avatarVenkateswararao Jujjuri (JV) <jvrao@linux.vnet.ibm.com>
Signed-off-by: default avatarEric Van Hensbergen <ericvh@gmail.com>
parent 9d6939da

fs/9p/v9fs_vfs.h

+1 −0
Original line number Diff line number Diff line
@@ -60,3 +60,4 @@ void v9fs_dentry_release(struct dentry *); 
int v9fs_uflags2omode(int uflags, int extended);



ssize_t v9fs_file_readn(struct file *, char *, char __user *, u32, u64);

void v9fs_blank_wstat(struct p9_wstat *wstat);

fs/9p/vfs_file.c

+19 −0
Original line number Diff line number Diff line
@@ -257,6 +257,23 @@ v9fs_file_write(struct file *filp, const char __user * data, 
	return total;

}



static int v9fs_file_fsync(struct file *filp, struct dentry *dentry,

					int datasync)

{

	struct p9_fid *fid;

	struct p9_wstat wstat;

	int retval;



	P9_DPRINTK(P9_DEBUG_VFS, "filp %p dentry %p datasync %x\n", filp,

						dentry, datasync);



	fid = filp->private_data;

	v9fs_blank_wstat(&wstat);



	retval = p9_client_wstat(fid, &wstat);

	return retval;

}



static const struct file_operations v9fs_cached_file_operations = {

	.llseek = generic_file_llseek,

	.read = do_sync_read,
@@ -266,6 +283,7 @@ static const struct file_operations v9fs_cached_file_operations = { 
	.release = v9fs_dir_release,

	.lock = v9fs_file_lock,

	.mmap = generic_file_readonly_mmap,

	.fsync = v9fs_file_fsync,

};



const struct file_operations v9fs_file_operations = {
@@ -276,4 +294,5 @@ const struct file_operations v9fs_file_operations = { 
	.release = v9fs_dir_release,

	.lock = v9fs_file_lock,

	.mmap = generic_file_readonly_mmap,

	.fsync = v9fs_file_fsync,

};

fs/9p/vfs_inode.c

+1 −1
Original line number Diff line number Diff line
@@ -176,7 +176,7 @@ int v9fs_uflags2omode(int uflags, int extended) 
 *

 */



static void

void

v9fs_blank_wstat(struct p9_wstat *wstat)

{

	wstat->type = ~0;

CRA Git | Maintained and supported by SUSTech CRA and CCSE