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hw/9pfs: Use little-endian format for xattr values 

With security_model=mapped-xattr, we encode the uid,gid and other file
attributes as extended attributes of the file. We save them under
user.virtfs.* namespace.

Use little-endian encoding for on-disk values. This enables us to export
the same directory from both little-endian and big-endian hosts.

NOTE: This will break big-endian host that have virtFS exports
using security model mapped-xattr. They will have to use external tools
to convert the xattr to little-endian format.

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
This commit is contained in:
Aneesh Kumar K.V 2014-08-03 17:02:55 +05:30
parent 30eaca3acd
commit f8ad4a89e9
1 changed files with 20 additions and 24 deletions
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44
hw/9pfs/virtio-9p-local.c
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@ -135,17 +135,17 @@ static int local_lstat(FsContext *fs_ctx, V9fsPath *fs_path, struct stat *stbuf)
mode_t tmp_mode;
dev_t tmp_dev;
if (getxattr(buffer, "user.virtfs.uid", &tmp_uid, sizeof(uid_t)) > 0) {
stbuf->st_uid = tmp_uid;
stbuf->st_uid = le32_to_cpu(tmp_uid);
}
if (getxattr(buffer, "user.virtfs.gid", &tmp_gid, sizeof(gid_t)) > 0) {
stbuf->st_gid = tmp_gid;
stbuf->st_gid = le32_to_cpu(tmp_gid);
}
if (getxattr(buffer, "user.virtfs.mode",
&tmp_mode, sizeof(mode_t)) > 0) {
stbuf->st_mode = tmp_mode;
stbuf->st_mode = le32_to_cpu(tmp_mode);
}
if (getxattr(buffer, "user.virtfs.rdev", &tmp_dev, sizeof(dev_t)) > 0) {
stbuf->st_rdev = tmp_dev;
stbuf->st_rdev = le64_to_cpu(tmp_dev);
}
} else if (fs_ctx->export_flags & V9FS_SM_MAPPED_FILE) {
local_mapped_file_attr(fs_ctx, path, stbuf);
@ -255,29 +255,29 @@ static int local_set_xattr(const char *path, FsCred *credp)
int err;
if (credp->fc_uid != -1) {
err = setxattr(path, "user.virtfs.uid", &credp->fc_uid, sizeof(uid_t),
0);
uint32_t tmp_uid = cpu_to_le32(credp->fc_uid);
err = setxattr(path, "user.virtfs.uid", &tmp_uid, sizeof(uid_t), 0);
if (err) {
return err;
}
}
if (credp->fc_gid != -1) {
err = setxattr(path, "user.virtfs.gid", &credp->fc_gid, sizeof(gid_t),
0);
uint32_t tmp_gid = cpu_to_le32(credp->fc_gid);
err = setxattr(path, "user.virtfs.gid", &tmp_gid, sizeof(gid_t), 0);
if (err) {
return err;
}
}
if (credp->fc_mode != -1) {
err = setxattr(path, "user.virtfs.mode", &credp->fc_mode,
sizeof(mode_t), 0);
uint32_t tmp_mode = cpu_to_le32(credp->fc_mode);
err = setxattr(path, "user.virtfs.mode", &tmp_mode, sizeof(mode_t), 0);
if (err) {
return err;
}
}
if (credp->fc_rdev != -1) {
err = setxattr(path, "user.virtfs.rdev", &credp->fc_rdev,
sizeof(dev_t), 0);
uint64_t tmp_rdev = cpu_to_le64(credp->fc_rdev);
err = setxattr(path, "user.virtfs.rdev", &tmp_rdev, sizeof(dev_t), 0);
if (err) {
return err;
}
@ -630,21 +630,17 @@ static int local_fstat(FsContext *fs_ctx, int fid_type,
mode_t tmp_mode;
dev_t tmp_dev;
if (fgetxattr(fd, "user.virtfs.uid",
&tmp_uid, sizeof(uid_t)) > 0) {
stbuf->st_uid = tmp_uid;
if (fgetxattr(fd, "user.virtfs.uid", &tmp_uid, sizeof(uid_t)) > 0) {
stbuf->st_uid = le32_to_cpu(tmp_uid);
}
if (fgetxattr(fd, "user.virtfs.gid",
&tmp_gid, sizeof(gid_t)) > 0) {
stbuf->st_gid = tmp_gid;
if (fgetxattr(fd, "user.virtfs.gid", &tmp_gid, sizeof(gid_t)) > 0) {
stbuf->st_gid = le32_to_cpu(tmp_gid);
}
if (fgetxattr(fd, "user.virtfs.mode",
&tmp_mode, sizeof(mode_t)) > 0) {
stbuf->st_mode = tmp_mode;
if (fgetxattr(fd, "user.virtfs.mode", &tmp_mode, sizeof(mode_t)) > 0) {
stbuf->st_mode = le32_to_cpu(tmp_mode);
}
if (fgetxattr(fd, "user.virtfs.rdev",
&tmp_dev, sizeof(dev_t)) > 0) {
stbuf->st_rdev = tmp_dev;
if (fgetxattr(fd, "user.virtfs.rdev", &tmp_dev, sizeof(dev_t)) > 0) {
stbuf->st_rdev = le64_to_cpu(tmp_dev);
}
} else if (fs_ctx->export_flags & V9FS_SM_MAPPED_FILE) {
errno = EOPNOTSUPP;