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authorSripathi Kodi <sripathik@in.ibm.com>2010-06-18 11:50:10 +0530
committerEric Van Hensbergen <ericvh@gmail.com>2010-08-02 14:25:10 -0500
commit87d7845aa0b157a62448dd3e339856f28befe1f4 (patch)
treebae5a5449f4bdb5ccfd1edcb99b285708c123e9f
parentf085312204f384a0277a66c3c48ba8f9edcd58f2 (diff)
9p: Implement client side of setattr for 9P2000.L protocol.
SYNOPSIS size[4] Tsetattr tag[2] attr[n] size[4] Rsetattr tag[2] DESCRIPTION The setattr command changes some of the file status information. attr resembles the iattr structure used in Linux kernel. It specifies which status parameter is to be changed and to what value. It is laid out as follows: valid[4] specifies which status information is to be changed. Possible values are: ATTR_MODE (1 << 0) ATTR_UID (1 << 1) ATTR_GID (1 << 2) ATTR_SIZE (1 << 3) ATTR_ATIME (1 << 4) ATTR_MTIME (1 << 5) ATTR_ATIME_SET (1 << 7) ATTR_MTIME_SET (1 << 8) The last two bits represent whether the time information is being sent by the client's user space. In the absense of these bits the server always uses server's time. mode[4] File permission bits uid[4] Owner id of file gid[4] Group id of the file size[8] File size atime_sec[8] Time of last file access, seconds atime_nsec[8] Time of last file access, nanoseconds mtime_sec[8] Time of last file modification, seconds mtime_nsec[8] Time of last file modification, nanoseconds Explanation of the patches: -------------------------- *) The kernel just copies relevent contents of iattr structure to p9_iattr_dotl structure and passes it down to the client. The only check it has is calling inode_change_ok() *) The p9_iattr_dotl structure does not have ctime and ia_file parameters because I don't think these are needed in our case. The client user space can request updating just ctime by calling chown(fd, -1, -1). This is handled on server side without a need for putting ctime on the wire. *) The server currently supports changing mode, time, ownership and size of the file. *) 9P RFC says "Either all the changes in wstat request happen, or none of them does: if the request succeeds, all changes were made; if it fails, none were." I have not done anything to implement this specifically because I don't see a reason. Signed-off-by: Sripathi Kodi <sripathik@in.ibm.com> Signed-off-by: Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
-rw-r--r--fs/9p/vfs_inode.c49
-rw-r--r--include/net/9p/9p.h28
-rw-r--r--include/net/9p/client.h1
-rw-r--r--net/9p/client.c30
-rw-r--r--net/9p/protocol.c17
5 files changed, 122 insertions, 3 deletions
diff --git a/fs/9p/vfs_inode.c b/fs/9p/vfs_inode.c
index afcb8d88938..a90324f4546 100644
--- a/fs/9p/vfs_inode.c
+++ b/fs/9p/vfs_inode.c
@@ -977,6 +977,49 @@ static int v9fs_vfs_setattr(struct dentry *dentry, struct iattr *iattr)
}
/**
+ * v9fs_vfs_setattr_dotl - set file metadata
+ * @dentry: file whose metadata to set
+ * @iattr: metadata assignment structure
+ *
+ */
+
+static int v9fs_vfs_setattr_dotl(struct dentry *dentry, struct iattr *iattr)
+{
+ int retval;
+ struct v9fs_session_info *v9ses;
+ struct p9_fid *fid;
+ struct p9_iattr_dotl p9attr;
+
+ P9_DPRINTK(P9_DEBUG_VFS, "\n");
+
+ retval = inode_change_ok(dentry->d_inode, iattr);
+ if (retval)
+ return retval;
+
+ p9attr.valid = iattr->ia_valid;
+ p9attr.mode = iattr->ia_mode;
+ p9attr.uid = iattr->ia_uid;
+ p9attr.gid = iattr->ia_gid;
+ p9attr.size = iattr->ia_size;
+ p9attr.atime_sec = iattr->ia_atime.tv_sec;
+ p9attr.atime_nsec = iattr->ia_atime.tv_nsec;
+ p9attr.mtime_sec = iattr->ia_mtime.tv_sec;
+ p9attr.mtime_nsec = iattr->ia_mtime.tv_nsec;
+
+ retval = -EPERM;
+ v9ses = v9fs_inode2v9ses(dentry->d_inode);
+ fid = v9fs_fid_lookup(dentry);
+ if (IS_ERR(fid))
+ return PTR_ERR(fid);
+
+ retval = p9_client_setattr(fid, &p9attr);
+ if (retval >= 0)
+ retval = inode_setattr(dentry->d_inode, iattr);
+
+ return retval;
+}
+
+/**
* v9fs_stat2inode - populate an inode structure with mistat info
* @stat: Plan 9 metadata (mistat) structure
* @inode: inode to populate
@@ -1400,7 +1443,7 @@ static const struct inode_operations v9fs_dir_inode_operations_dotl = {
.mknod = v9fs_vfs_mknod,
.rename = v9fs_vfs_rename,
.getattr = v9fs_vfs_getattr_dotl,
- .setattr = v9fs_vfs_setattr,
+ .setattr = v9fs_vfs_setattr_dotl,
};
static const struct inode_operations v9fs_dir_inode_operations = {
@@ -1422,7 +1465,7 @@ static const struct inode_operations v9fs_file_inode_operations = {
static const struct inode_operations v9fs_file_inode_operations_dotl = {
.getattr = v9fs_vfs_getattr_dotl,
- .setattr = v9fs_vfs_setattr,
+ .setattr = v9fs_vfs_setattr_dotl,
};
static const struct inode_operations v9fs_symlink_inode_operations = {
@@ -1438,5 +1481,5 @@ static const struct inode_operations v9fs_symlink_inode_operations_dotl = {
.follow_link = v9fs_vfs_follow_link,
.put_link = v9fs_vfs_put_link,
.getattr = v9fs_vfs_getattr_dotl,
- .setattr = v9fs_vfs_setattr,
+ .setattr = v9fs_vfs_setattr_dotl,
};
diff --git a/include/net/9p/9p.h b/include/net/9p/9p.h
index ab12e1c9cc7..7f64d72f6c6 100644
--- a/include/net/9p/9p.h
+++ b/include/net/9p/9p.h
@@ -135,6 +135,8 @@ enum p9_msg_t {
P9_RRENAME,
P9_TGETATTR = 24,
P9_RGETATTR,
+ P9_TSETATTR = 26,
+ P9_RSETATTR,
P9_TREADDIR = 40,
P9_RREADDIR,
P9_TVERSION = 100,
@@ -406,6 +408,32 @@ struct p9_stat_dotl {
#define P9_STATS_BASIC 0x000007ffULL /* Mask for fields up to BLOCKS */
#define P9_STATS_ALL 0x00003fffULL /* Mask for All fields above */
+/**
+ * struct p9_iattr_dotl - P9 inode attribute for setattr
+ * @valid: bitfield specifying which fields are valid
+ * same as in struct iattr
+ * @mode: File permission bits
+ * @uid: user id of owner
+ * @gid: group id
+ * @size: File size
+ * @atime_sec: Last access time, seconds
+ * @atime_nsec: Last access time, nanoseconds
+ * @mtime_sec: Last modification time, seconds
+ * @mtime_nsec: Last modification time, nanoseconds
+ */
+
+struct p9_iattr_dotl {
+ u32 valid;
+ u32 mode;
+ u32 uid;
+ u32 gid;
+ u64 size;
+ u64 atime_sec;
+ u64 atime_nsec;
+ u64 mtime_sec;
+ u64 mtime_nsec;
+};
+
/* Structures for Protocol Operations */
struct p9_tstatfs {
u32 fid;
diff --git a/include/net/9p/client.h b/include/net/9p/client.h
index 6462eec435b..afdc385152f 100644
--- a/include/net/9p/client.h
+++ b/include/net/9p/client.h
@@ -237,6 +237,7 @@ int p9dirent_read(char *buf, int len, struct p9_dirent *dirent,
int proto_version);
struct p9_wstat *p9_client_stat(struct p9_fid *fid);
int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst);
+int p9_client_setattr(struct p9_fid *fid, struct p9_iattr_dotl *attr);
struct p9_stat_dotl *p9_client_getattr_dotl(struct p9_fid *fid,
u64 request_mask);
diff --git a/net/9p/client.c b/net/9p/client.c
index 5e97118da3b..b2f70ec889c 100644
--- a/net/9p/client.c
+++ b/net/9p/client.c
@@ -1426,6 +1426,36 @@ error:
}
EXPORT_SYMBOL(p9_client_wstat);
+int p9_client_setattr(struct p9_fid *fid, struct p9_iattr_dotl *p9attr)
+{
+ int err;
+ struct p9_req_t *req;
+ struct p9_client *clnt;
+
+ err = 0;
+ clnt = fid->clnt;
+ P9_DPRINTK(P9_DEBUG_9P, ">>> TSETATTR fid %d\n", fid->fid);
+ P9_DPRINTK(P9_DEBUG_9P,
+ " valid=%x mode=%x uid=%d gid=%d size=%lld\n"
+ " atime_sec=%lld atime_nsec=%lld\n"
+ " mtime_sec=%lld mtime_nsec=%lld\n",
+ p9attr->valid, p9attr->mode, p9attr->uid, p9attr->gid,
+ p9attr->size, p9attr->atime_sec, p9attr->atime_nsec,
+ p9attr->mtime_sec, p9attr->mtime_nsec);
+
+ req = p9_client_rpc(clnt, P9_TSETATTR, "dI", fid->fid, p9attr);
+
+ if (IS_ERR(req)) {
+ err = PTR_ERR(req);
+ goto error;
+ }
+ P9_DPRINTK(P9_DEBUG_9P, "<<< RSETATTR fid %d\n", fid->fid);
+ p9_free_req(clnt, req);
+error:
+ return err;
+}
+EXPORT_SYMBOL(p9_client_setattr);
+
int p9_client_statfs(struct p9_fid *fid, struct p9_rstatfs *sb)
{
int err;
diff --git a/net/9p/protocol.c b/net/9p/protocol.c
index 3e4f7769589..3acd3afb20c 100644
--- a/net/9p/protocol.c
+++ b/net/9p/protocol.c
@@ -516,6 +516,23 @@ p9pdu_vwritef(struct p9_fcall *pdu, int proto_version, const char *fmt,
}
}
break;
+ case 'I':{
+ struct p9_iattr_dotl *p9attr = va_arg(ap,
+ struct p9_iattr_dotl *);
+
+ errcode = p9pdu_writef(pdu, proto_version,
+ "ddddqqqqq",
+ p9attr->valid,
+ p9attr->mode,
+ p9attr->uid,
+ p9attr->gid,
+ p9attr->size,
+ p9attr->atime_sec,
+ p9attr->atime_nsec,
+ p9attr->mtime_sec,
+ p9attr->mtime_nsec);
+ }
+ break;
case '?':
if ((proto_version != p9_proto_2000u) &&
(proto_version != p9_proto_2000L))