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9p: add 9P2000.L statfs operation

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I made a V2 of this patch on top of my patches for VFS switches. The
change was adding v9fs_statfs pointer to v9fs_super_ops_dotl
instead of v9fs_super_ops.

statfs - get file system statistics

size[4] Tstatfs tag[2] fid[4]
size[4] Rstatfs tag[2] type[4] bsize[4] blocks[8] bfree[8] bavail[8]
                files[8] ffree[8] fsid[8] namelen[4]

The statfs message is used to request file system information returned
by the statfs(2) system call, which is used by df(1) to report file
system and disk space usage.

Signed-off-by: Jim Garlick <garlick@llnl.gov>
Signed-off-by: Sripathi Kodi <sripathik@in.ibm.com>
Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
This commit is contained in:
Sripathi Kodi
2010-03-25 12:45:30 +00:00
committed by Eric Van Hensbergen
parent 9b6533c9b3
commit bda8e77520
4 changed files with 98 additions and 1 deletions
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fs/9p/vfs_super.c
+38 -1
View File
@@ -38,6 +38,7 @@
#include <linux/idr.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/statfs.h>
#include <net/9p/9p.h>
#include <net/9p/client.h>
@@ -214,6 +215,42 @@ v9fs_umount_begin(struct super_block *sb)
v9fs_session_begin_cancel(v9ses);
}
static int v9fs_statfs(struct dentry *dentry, struct kstatfs *buf)
{
struct v9fs_session_info *v9ses;
struct p9_fid *fid;
struct p9_rstatfs rs;
int res;
fid = v9fs_fid_lookup(dentry);
if (IS_ERR(fid)) {
res = PTR_ERR(fid);
goto done;
}
v9ses = v9fs_inode2v9ses(dentry->d_inode);
if (v9fs_proto_dotl(v9ses)) {
res = p9_client_statfs(fid, &rs);
if (res == 0) {
buf->f_type = rs.type;
buf->f_bsize = rs.bsize;
buf->f_blocks = rs.blocks;
buf->f_bfree = rs.bfree;
buf->f_bavail = rs.bavail;
buf->f_files = rs.files;
buf->f_ffree = rs.ffree;
buf->f_fsid.val[0] = rs.fsid & 0xFFFFFFFFUL;
buf->f_fsid.val[1] = (rs.fsid >> 32) & 0xFFFFFFFFUL;
buf->f_namelen = rs.namelen;
}
if (res != -ENOSYS)
goto done;
}
res = simple_statfs(dentry, buf);
done:
return res;
}
static const struct super_operations v9fs_super_ops = {
#ifdef CONFIG_9P_FSCACHE
.alloc_inode = v9fs_alloc_inode,
@@ -230,7 +267,7 @@ static const struct super_operations v9fs_super_ops_dotl = {
.alloc_inode = v9fs_alloc_inode,
.destroy_inode = v9fs_destroy_inode,
#endif
.statfs = simple_statfs,
.statfs = v9fs_statfs,
.clear_inode = v9fs_clear_inode,
.show_options = generic_show_options,
.umount_begin = v9fs_umount_begin,