9p: getattr client implementation for 9P2000.L protocol.
SYNOPSIS
size[4] Tgetattr tag[2] fid[4] request_mask[8]
size[4] Rgetattr tag[2] lstat[n]
DESCRIPTION
The getattr transaction inquires about the file identified by fid.
request_mask is a bit mask that specifies which fields of the
stat structure is the client interested in.
The reply will contain a machine-independent directory entry,
laid out as follows:
st_result_mask[8]
Bit mask that indicates which fields in the stat structure
have been populated by the server
qid.type[1]
the type of the file (directory, etc.), represented as a bit
vector corresponding to the high 8 bits of the file's mode
word.
qid.vers[4]
version number for given path
qid.path[8]
the file server's unique identification for the file
st_mode[4]
Permission and flags
st_uid[4]
User id of owner
st_gid[4]
Group ID of owner
st_nlink[8]
Number of hard links
st_rdev[8]
Device ID (if special file)
st_size[8]
Size, in bytes
st_blksize[8]
Block size for file system IO
st_blocks[8]
Number of file system blocks allocated
st_atime_sec[8]
Time of last access, seconds
st_atime_nsec[8]
Time of last access, nanoseconds
st_mtime_sec[8]
Time of last modification, seconds
st_mtime_nsec[8]
Time of last modification, nanoseconds
st_ctime_sec[8]
Time of last status change, seconds
st_ctime_nsec[8]
Time of last status change, nanoseconds
st_btime_sec[8]
Time of creation (birth) of file, seconds
st_btime_nsec[8]
Time of creation (birth) of file, nanoseconds
st_gen[8]
Inode generation
st_data_version[8]
Data version number
request_mask and result_mask bit masks contain the following bits
#define P9_STATS_MODE 0x00000001ULL
#define P9_STATS_NLINK 0x00000002ULL
#define P9_STATS_UID 0x00000004ULL
#define P9_STATS_GID 0x00000008ULL
#define P9_STATS_RDEV 0x00000010ULL
#define P9_STATS_ATIME 0x00000020ULL
#define P9_STATS_MTIME 0x00000040ULL
#define P9_STATS_CTIME 0x00000080ULL
#define P9_STATS_INO 0x00000100ULL
#define P9_STATS_SIZE 0x00000200ULL
#define P9_STATS_BLOCKS 0x00000400ULL
#define P9_STATS_BTIME 0x00000800ULL
#define P9_STATS_GEN 0x00001000ULL
#define P9_STATS_DATA_VERSION 0x00002000ULL
#define P9_STATS_BASIC 0x000007ffULL
#define P9_STATS_ALL 0x00003fffULL
This patch implements the client side of getattr implementation for
9P2000.L. It introduces a new structure p9_stat_dotl for getting
Linux stat information along with QID. The data layout is similar to
stat structure in Linux user space with the following major
differences:
inode (st_ino) is not part of data. Instead qid is.
device (st_dev) is not part of data because this doesn't make sense
on the client.
All time variables are 64 bit wide on the wire. The kernel seems to use
32 bit variables for these variables. However, some of the architectures
have used 64 bit variables and glibc exposes 64 bit variables to user
space on some architectures. Hence to be on the safer side we have made
these 64 bit in the protocol. Refer to the comments in
include/asm-generic/stat.h
There are some additional fields: st_btime_sec, st_btime_nsec, st_gen,
st_data_version apart from the bitmask, st_result_mask. The bit mask
is filled by the server to indicate which stat fields have been
populated by the server. Currently there is no clean way for the
server to obtain these additional fields, so it sends back just the
basic fields.
Signed-off-by: Sripathi Kodi <sripathik@in.ibm.com>
Signed-off-by: Eric Van Hensbegren <ericvh@gmail.com>
diff --git a/fs/9p/v9fs_vfs.h b/fs/9p/v9fs_vfs.h
index 32ef400..f47c6bb 100644
--- a/fs/9p/v9fs_vfs.h
+++ b/fs/9p/v9fs_vfs.h
@@ -55,6 +55,7 @@
void v9fs_clear_inode(struct inode *inode);
ino_t v9fs_qid2ino(struct p9_qid *qid);
void v9fs_stat2inode(struct p9_wstat *, struct inode *, struct super_block *);
+void v9fs_stat2inode_dotl(struct p9_stat_dotl *, struct inode *);
int v9fs_dir_release(struct inode *inode, struct file *filp);
int v9fs_file_open(struct inode *inode, struct file *file);
void v9fs_inode2stat(struct inode *inode, struct p9_wstat *stat);
diff --git a/fs/9p/vfs_inode.c b/fs/9p/vfs_inode.c
index 4331b3b..afcb8d8 100644
--- a/fs/9p/vfs_inode.c
+++ b/fs/9p/vfs_inode.c
@@ -396,23 +396,14 @@
#endif
}
-/**
- * v9fs_inode_from_fid - populate an inode by issuing a attribute request
- * @v9ses: session information
- * @fid: fid to issue attribute request for
- * @sb: superblock on which to create inode
- *
- */
-
static struct inode *
-v9fs_inode_from_fid(struct v9fs_session_info *v9ses, struct p9_fid *fid,
+v9fs_inode(struct v9fs_session_info *v9ses, struct p9_fid *fid,
struct super_block *sb)
{
int err, umode;
- struct inode *ret;
+ struct inode *ret = NULL;
struct p9_wstat *st;
- ret = NULL;
st = p9_client_stat(fid);
if (IS_ERR(st))
return ERR_CAST(st);
@@ -433,15 +424,62 @@
#endif
p9stat_free(st);
kfree(st);
-
return ret;
-
error:
p9stat_free(st);
kfree(st);
return ERR_PTR(err);
}
+static struct inode *
+v9fs_inode_dotl(struct v9fs_session_info *v9ses, struct p9_fid *fid,
+ struct super_block *sb)
+{
+ struct inode *ret = NULL;
+ int err;
+ struct p9_stat_dotl *st;
+
+ st = p9_client_getattr_dotl(fid, P9_STATS_BASIC);
+ if (IS_ERR(st))
+ return ERR_CAST(st);
+
+ ret = v9fs_get_inode(sb, st->st_mode);
+ if (IS_ERR(ret)) {
+ err = PTR_ERR(ret);
+ goto error;
+ }
+
+ v9fs_stat2inode_dotl(st, ret);
+ ret->i_ino = v9fs_qid2ino(&st->qid);
+#ifdef CONFIG_9P_FSCACHE
+ v9fs_vcookie_set_qid(ret, &st->qid);
+ v9fs_cache_inode_get_cookie(ret);
+#endif
+ kfree(st);
+ return ret;
+error:
+ kfree(st);
+ return ERR_PTR(err);
+}
+
+/**
+ * v9fs_inode_from_fid - Helper routine to populate an inode by
+ * issuing a attribute request
+ * @v9ses: session information
+ * @fid: fid to issue attribute request for
+ * @sb: superblock on which to create inode
+ *
+ */
+static inline struct inode *
+v9fs_inode_from_fid(struct v9fs_session_info *v9ses, struct p9_fid *fid,
+ struct super_block *sb)
+{
+ if (v9fs_proto_dotl(v9ses))
+ return v9fs_inode_dotl(v9ses, fid, sb);
+ else
+ return v9fs_inode(v9ses, fid, sb);
+}
+
/**
* v9fs_remove - helper function to remove files and directories
* @dir: directory inode that is being deleted
@@ -853,6 +891,42 @@
return 0;
}
+static int
+v9fs_vfs_getattr_dotl(struct vfsmount *mnt, struct dentry *dentry,
+ struct kstat *stat)
+{
+ int err;
+ struct v9fs_session_info *v9ses;
+ struct p9_fid *fid;
+ struct p9_stat_dotl *st;
+
+ P9_DPRINTK(P9_DEBUG_VFS, "dentry: %p\n", dentry);
+ err = -EPERM;
+ v9ses = v9fs_inode2v9ses(dentry->d_inode);
+ if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE)
+ return simple_getattr(mnt, dentry, stat);
+
+ fid = v9fs_fid_lookup(dentry);
+ if (IS_ERR(fid))
+ return PTR_ERR(fid);
+
+ /* Ask for all the fields in stat structure. Server will return
+ * whatever it supports
+ */
+
+ st = p9_client_getattr_dotl(fid, P9_STATS_ALL);
+ if (IS_ERR(st))
+ return PTR_ERR(st);
+
+ v9fs_stat2inode_dotl(st, dentry->d_inode);
+ generic_fillattr(dentry->d_inode, stat);
+ /* Change block size to what the server returned */
+ stat->blksize = st->st_blksize;
+
+ kfree(st);
+ return 0;
+}
+
/**
* v9fs_vfs_setattr - set file metadata
* @dentry: file whose metadata to set
@@ -980,6 +1054,77 @@
}
/**
+ * v9fs_stat2inode_dotl - populate an inode structure with stat info
+ * @stat: stat structure
+ * @inode: inode to populate
+ * @sb: superblock of filesystem
+ *
+ */
+
+void
+v9fs_stat2inode_dotl(struct p9_stat_dotl *stat, struct inode *inode)
+{
+
+ if ((stat->st_result_mask & P9_STATS_BASIC) == P9_STATS_BASIC) {
+ inode->i_atime.tv_sec = stat->st_atime_sec;
+ inode->i_atime.tv_nsec = stat->st_atime_nsec;
+ inode->i_mtime.tv_sec = stat->st_mtime_sec;
+ inode->i_mtime.tv_nsec = stat->st_mtime_nsec;
+ inode->i_ctime.tv_sec = stat->st_ctime_sec;
+ inode->i_ctime.tv_nsec = stat->st_ctime_nsec;
+ inode->i_uid = stat->st_uid;
+ inode->i_gid = stat->st_gid;
+ inode->i_nlink = stat->st_nlink;
+ inode->i_mode = stat->st_mode;
+ inode->i_rdev = new_decode_dev(stat->st_rdev);
+
+ if ((S_ISBLK(inode->i_mode)) || (S_ISCHR(inode->i_mode)))
+ init_special_inode(inode, inode->i_mode, inode->i_rdev);
+
+ i_size_write(inode, stat->st_size);
+ inode->i_blocks = stat->st_blocks;
+ } else {
+ if (stat->st_result_mask & P9_STATS_ATIME) {
+ inode->i_atime.tv_sec = stat->st_atime_sec;
+ inode->i_atime.tv_nsec = stat->st_atime_nsec;
+ }
+ if (stat->st_result_mask & P9_STATS_MTIME) {
+ inode->i_mtime.tv_sec = stat->st_mtime_sec;
+ inode->i_mtime.tv_nsec = stat->st_mtime_nsec;
+ }
+ if (stat->st_result_mask & P9_STATS_CTIME) {
+ inode->i_ctime.tv_sec = stat->st_ctime_sec;
+ inode->i_ctime.tv_nsec = stat->st_ctime_nsec;
+ }
+ if (stat->st_result_mask & P9_STATS_UID)
+ inode->i_uid = stat->st_uid;
+ if (stat->st_result_mask & P9_STATS_GID)
+ inode->i_gid = stat->st_gid;
+ if (stat->st_result_mask & P9_STATS_NLINK)
+ inode->i_nlink = stat->st_nlink;
+ if (stat->st_result_mask & P9_STATS_MODE) {
+ inode->i_mode = stat->st_mode;
+ if ((S_ISBLK(inode->i_mode)) ||
+ (S_ISCHR(inode->i_mode)))
+ init_special_inode(inode, inode->i_mode,
+ inode->i_rdev);
+ }
+ if (stat->st_result_mask & P9_STATS_RDEV)
+ inode->i_rdev = new_decode_dev(stat->st_rdev);
+ if (stat->st_result_mask & P9_STATS_SIZE)
+ i_size_write(inode, stat->st_size);
+ if (stat->st_result_mask & P9_STATS_BLOCKS)
+ inode->i_blocks = stat->st_blocks;
+ }
+ if (stat->st_result_mask & P9_STATS_GEN)
+ inode->i_generation = stat->st_gen;
+
+ /* Currently we don't support P9_STATS_BTIME and P9_STATS_DATA_VERSION
+ * because the inode structure does not have fields for them.
+ */
+}
+
+/**
* v9fs_qid2ino - convert qid into inode number
* @qid: qid to hash
*
@@ -1254,7 +1399,7 @@
.rmdir = v9fs_vfs_rmdir,
.mknod = v9fs_vfs_mknod,
.rename = v9fs_vfs_rename,
- .getattr = v9fs_vfs_getattr,
+ .getattr = v9fs_vfs_getattr_dotl,
.setattr = v9fs_vfs_setattr,
};
@@ -1276,7 +1421,7 @@
};
static const struct inode_operations v9fs_file_inode_operations_dotl = {
- .getattr = v9fs_vfs_getattr,
+ .getattr = v9fs_vfs_getattr_dotl,
.setattr = v9fs_vfs_setattr,
};
@@ -1292,6 +1437,6 @@
.readlink = generic_readlink,
.follow_link = v9fs_vfs_follow_link,
.put_link = v9fs_vfs_put_link,
- .getattr = v9fs_vfs_getattr,
+ .getattr = v9fs_vfs_getattr_dotl,
.setattr = v9fs_vfs_setattr,
};
diff --git a/fs/9p/vfs_super.c b/fs/9p/vfs_super.c
index be74d02..3623f69 100644
--- a/fs/9p/vfs_super.c
+++ b/fs/9p/vfs_super.c
@@ -107,7 +107,6 @@
struct inode *inode = NULL;
struct dentry *root = NULL;
struct v9fs_session_info *v9ses = NULL;
- struct p9_wstat *st = NULL;
int mode = S_IRWXUGO | S_ISVTX;
struct p9_fid *fid;
int retval = 0;
@@ -124,16 +123,10 @@
goto close_session;
}
- st = p9_client_stat(fid);
- if (IS_ERR(st)) {
- retval = PTR_ERR(st);
- goto clunk_fid;
- }
-
sb = sget(fs_type, NULL, v9fs_set_super, v9ses);
if (IS_ERR(sb)) {
retval = PTR_ERR(sb);
- goto free_stat;
+ goto clunk_fid;
}
v9fs_fill_super(sb, v9ses, flags, data);
@@ -151,22 +144,38 @@
}
sb->s_root = root;
- root->d_inode->i_ino = v9fs_qid2ino(&st->qid);
- v9fs_stat2inode(st, root->d_inode, sb);
+ if (v9fs_proto_dotl(v9ses)) {
+ struct p9_stat_dotl *st = NULL;
+ st = p9_client_getattr_dotl(fid, P9_STATS_BASIC);
+ if (IS_ERR(st)) {
+ retval = PTR_ERR(st);
+ goto clunk_fid;
+ }
+
+ v9fs_stat2inode_dotl(st, root->d_inode);
+ kfree(st);
+ } else {
+ struct p9_wstat *st = NULL;
+ st = p9_client_stat(fid);
+ if (IS_ERR(st)) {
+ retval = PTR_ERR(st);
+ goto clunk_fid;
+ }
+
+ root->d_inode->i_ino = v9fs_qid2ino(&st->qid);
+ v9fs_stat2inode(st, root->d_inode, sb);
+
+ p9stat_free(st);
+ kfree(st);
+ }
v9fs_fid_add(root, fid);
- p9stat_free(st);
- kfree(st);
P9_DPRINTK(P9_DEBUG_VFS, " simple set mount, return 0\n");
simple_set_mnt(mnt, sb);
return 0;
-free_stat:
- p9stat_free(st);
- kfree(st);
-
clunk_fid:
p9_client_clunk(fid);
@@ -176,8 +185,6 @@
return retval;
release_sb:
- p9stat_free(st);
- kfree(st);
deactivate_locked_super(sb);
return retval;
}
diff --git a/include/net/9p/9p.h b/include/net/9p/9p.h
index f1b0b31..ab12e1c 100644
--- a/include/net/9p/9p.h
+++ b/include/net/9p/9p.h
@@ -133,6 +133,8 @@
P9_RSTATFS,
P9_TRENAME = 20,
P9_RRENAME,
+ P9_TGETATTR = 24,
+ P9_RGETATTR,
P9_TREADDIR = 40,
P9_RREADDIR,
P9_TVERSION = 100,
@@ -362,6 +364,48 @@
u32 n_muid; /* 9p2000.u extensions */
};
+struct p9_stat_dotl {
+ u64 st_result_mask;
+ struct p9_qid qid;
+ u32 st_mode;
+ u32 st_uid;
+ u32 st_gid;
+ u64 st_nlink;
+ u64 st_rdev;
+ u64 st_size;
+ u64 st_blksize;
+ u64 st_blocks;
+ u64 st_atime_sec;
+ u64 st_atime_nsec;
+ u64 st_mtime_sec;
+ u64 st_mtime_nsec;
+ u64 st_ctime_sec;
+ u64 st_ctime_nsec;
+ u64 st_btime_sec;
+ u64 st_btime_nsec;
+ u64 st_gen;
+ u64 st_data_version;
+};
+
+#define P9_STATS_MODE 0x00000001ULL
+#define P9_STATS_NLINK 0x00000002ULL
+#define P9_STATS_UID 0x00000004ULL
+#define P9_STATS_GID 0x00000008ULL
+#define P9_STATS_RDEV 0x00000010ULL
+#define P9_STATS_ATIME 0x00000020ULL
+#define P9_STATS_MTIME 0x00000040ULL
+#define P9_STATS_CTIME 0x00000080ULL
+#define P9_STATS_INO 0x00000100ULL
+#define P9_STATS_SIZE 0x00000200ULL
+#define P9_STATS_BLOCKS 0x00000400ULL
+
+#define P9_STATS_BTIME 0x00000800ULL
+#define P9_STATS_GEN 0x00001000ULL
+#define P9_STATS_DATA_VERSION 0x00002000ULL
+
+#define P9_STATS_BASIC 0x000007ffULL /* Mask for fields up to BLOCKS */
+#define P9_STATS_ALL 0x00003fffULL /* Mask for All fields above */
+
/* Structures for Protocol Operations */
struct p9_tstatfs {
u32 fid;
diff --git a/include/net/9p/client.h b/include/net/9p/client.h
index 2ec9368..6462eec 100644
--- a/include/net/9p/client.h
+++ b/include/net/9p/client.h
@@ -238,6 +238,9 @@
struct p9_wstat *p9_client_stat(struct p9_fid *fid);
int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst);
+struct p9_stat_dotl *p9_client_getattr_dotl(struct p9_fid *fid,
+ u64 request_mask);
+
struct p9_req_t *p9_tag_lookup(struct p9_client *, u16);
void p9_client_cb(struct p9_client *c, struct p9_req_t *req);
diff --git a/net/9p/client.c b/net/9p/client.c
index 4ff068e..5e97118 100644
--- a/net/9p/client.c
+++ b/net/9p/client.c
@@ -1303,6 +1303,65 @@
}
EXPORT_SYMBOL(p9_client_stat);
+struct p9_stat_dotl *p9_client_getattr_dotl(struct p9_fid *fid,
+ u64 request_mask)
+{
+ int err;
+ struct p9_client *clnt;
+ struct p9_stat_dotl *ret = kmalloc(sizeof(struct p9_stat_dotl),
+ GFP_KERNEL);
+ struct p9_req_t *req;
+
+ P9_DPRINTK(P9_DEBUG_9P, ">>> TGETATTR fid %d, request_mask %lld\n",
+ fid->fid, request_mask);
+
+ if (!ret)
+ return ERR_PTR(-ENOMEM);
+
+ err = 0;
+ clnt = fid->clnt;
+
+ req = p9_client_rpc(clnt, P9_TGETATTR, "dq", fid->fid, request_mask);
+ if (IS_ERR(req)) {
+ err = PTR_ERR(req);
+ goto error;
+ }
+
+ err = p9pdu_readf(req->rc, clnt->proto_version, "A", ret);
+ if (err) {
+ p9pdu_dump(1, req->rc);
+ p9_free_req(clnt, req);
+ goto error;
+ }
+
+ P9_DPRINTK(P9_DEBUG_9P,
+ "<<< RGETATTR st_result_mask=%lld\n"
+ "<<< qid=%x.%llx.%x\n"
+ "<<< st_mode=%8.8x st_nlink=%llu\n"
+ "<<< st_uid=%d st_gid=%d\n"
+ "<<< st_rdev=%llx st_size=%llx st_blksize=%llu st_blocks=%llu\n"
+ "<<< st_atime_sec=%lld st_atime_nsec=%lld\n"
+ "<<< st_mtime_sec=%lld st_mtime_nsec=%lld\n"
+ "<<< st_ctime_sec=%lld st_ctime_nsec=%lld\n"
+ "<<< st_btime_sec=%lld st_btime_nsec=%lld\n"
+ "<<< st_gen=%lld st_data_version=%lld",
+ ret->st_result_mask, ret->qid.type, ret->qid.path,
+ ret->qid.version, ret->st_mode, ret->st_nlink, ret->st_uid,
+ ret->st_gid, ret->st_rdev, ret->st_size, ret->st_blksize,
+ ret->st_blocks, ret->st_atime_sec, ret->st_atime_nsec,
+ ret->st_mtime_sec, ret->st_mtime_nsec, ret->st_ctime_sec,
+ ret->st_ctime_nsec, ret->st_btime_sec, ret->st_btime_nsec,
+ ret->st_gen, ret->st_data_version);
+
+ p9_free_req(clnt, req);
+ return ret;
+
+error:
+ kfree(ret);
+ return ERR_PTR(err);
+}
+EXPORT_SYMBOL(p9_client_getattr_dotl);
+
static int p9_client_statsize(struct p9_wstat *wst, int proto_version)
{
int ret;
diff --git a/net/9p/protocol.c b/net/9p/protocol.c
index b645c82..3e4f776 100644
--- a/net/9p/protocol.c
+++ b/net/9p/protocol.c
@@ -141,6 +141,7 @@
D - data blob (int32_t size followed by void *, results are not freed)
T - array of strings (int16_t count, followed by strings)
R - array of qids (int16_t count, followed by qids)
+ A - stat for 9p2000.L (p9_stat_dotl)
? - if optional = 1, continue parsing
*/
@@ -340,6 +341,33 @@
}
}
break;
+ case 'A': {
+ struct p9_stat_dotl *stbuf =
+ va_arg(ap, struct p9_stat_dotl *);
+
+ memset(stbuf, 0, sizeof(struct p9_stat_dotl));
+ errcode =
+ p9pdu_readf(pdu, proto_version,
+ "qQdddqqqqqqqqqqqqqqq",
+ &stbuf->st_result_mask,
+ &stbuf->qid,
+ &stbuf->st_mode,
+ &stbuf->st_uid, &stbuf->st_gid,
+ &stbuf->st_nlink,
+ &stbuf->st_rdev, &stbuf->st_size,
+ &stbuf->st_blksize, &stbuf->st_blocks,
+ &stbuf->st_atime_sec,
+ &stbuf->st_atime_nsec,
+ &stbuf->st_mtime_sec,
+ &stbuf->st_mtime_nsec,
+ &stbuf->st_ctime_sec,
+ &stbuf->st_ctime_nsec,
+ &stbuf->st_btime_sec,
+ &stbuf->st_btime_nsec,
+ &stbuf->st_gen,
+ &stbuf->st_data_version);
+ }
+ break;
case '?':
if ((proto_version != p9_proto_2000u) &&
(proto_version != p9_proto_2000L))