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9p: Include fsync support for 9p client

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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: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> 
Signed-off-by: M. Mohan Kumar <mohan@in.ibm.com> 
Acked-by: Venkateswararao Jujjuri (JV) <jvrao@linux.vnet.ibm.com>
Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
This commit is contained in:
M. Mohan Kumar 2010-02-08 15:36:48 -06:00 committed by Eric Van Hensbergen
parent 9d6939dac7
commit 7a4439c406
3 changed files with 21 additions and 1 deletions
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1
fs/9p/v9fs_vfs.h
View File

@ -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);

19
fs/9p/vfs_file.c
View File

@ -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,
};

2
fs/9p/vfs_inode.c
View File

@ -176,7 +176,7 @@ int v9fs_uflags2omode(int uflags, int extended)
*
*/
static void
void
v9fs_blank_wstat(struct p9_wstat *wstat)
{
wstat->type = ~0;