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tools/virtiofsd: xattr name mappings: Map client xattr names

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Map xattr names originating at the client; from get/set/remove xattr.

Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Message-Id: <20201023165812.36028-3-dgilbert@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
This commit is contained in:
Dr. David Alan Gilbert 2020-10-23 17:58:09 +01:00
parent 6084633dff
commit 4f088dbf98
1 changed files with 98 additions and 3 deletions
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101
tools/virtiofsd/passthrough_ll.c
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@ -2188,20 +2188,80 @@ static void parse_xattrmap(struct lo_data *lo)
}
}
static void lo_getxattr(fuse_req_t req, fuse_ino_t ino, const char *name,
/*
* For use with getxattr/setxattr/removexattr, where the client
* gives us a name and we may need to choose a different one.
* Allocates a buffer for the result placing it in *out_name.
* If there's no change then *out_name is not set.
* Returns 0 on success
* Can return -EPERM to indicate we block a given attribute
* (in which case out_name is not allocated)
* Can return -ENOMEM to indicate out_name couldn't be allocated.
*/
static int xattr_map_client(const struct lo_data *lo, const char *client_name,
char **out_name)
{
size_t i;
for (i = 0; i < lo->xattr_map_nentries; i++) {
const XattrMapEntry *cur_entry = lo->xattr_map_list + i;
if ((cur_entry->flags & XATTR_MAP_FLAG_CLIENT) &&
(strstart(client_name, cur_entry->key, NULL))) {
if (cur_entry->flags & XATTR_MAP_FLAG_BAD) {
return -EPERM;
}
if (cur_entry->flags & XATTR_MAP_FLAG_OK) {
/* Unmodified name */
return 0;
}
if (cur_entry->flags & XATTR_MAP_FLAG_PREFIX) {
*out_name = g_try_malloc(strlen(client_name) +
strlen(cur_entry->prepend) + 1);
if (!*out_name) {
return -ENOMEM;
}
sprintf(*out_name, "%s%s", cur_entry->prepend, client_name);
return 0;
}
}
}
return -EPERM;
}
static void lo_getxattr(fuse_req_t req, fuse_ino_t ino, const char *in_name,
size_t size)
{
struct lo_data *lo = lo_data(req);
char *value = NULL;
char procname[64];
const char *name;
char *mapped_name;
struct lo_inode *inode;
ssize_t ret;
int saverr;
int fd = -1;
mapped_name = NULL;
name = in_name;
if (lo->xattrmap) {
ret = xattr_map_client(lo, in_name, &mapped_name);
if (ret < 0) {
if (ret == -EPERM) {
ret = -ENODATA;
}
fuse_reply_err(req, -ret);
return;
}
if (mapped_name) {
name = mapped_name;
}
}
inode = lo_inode(req, ino);
if (!inode) {
fuse_reply_err(req, EBADF);
g_free(mapped_name);
return;
}
@ -2266,6 +2326,7 @@ out_err:
saverr = errno;
out:
fuse_reply_err(req, saverr);
g_free(mapped_name);
goto out_free;
}
@ -2343,19 +2404,35 @@ out:
goto out_free;
}
static void lo_setxattr(fuse_req_t req, fuse_ino_t ino, const char *name,
static void lo_setxattr(fuse_req_t req, fuse_ino_t ino, const char *in_name,
const char *value, size_t size, int flags)
{
char procname[64];
const char *name;
char *mapped_name;
struct lo_data *lo = lo_data(req);
struct lo_inode *inode;
ssize_t ret;
int saverr;
int fd = -1;
mapped_name = NULL;
name = in_name;
if (lo->xattrmap) {
ret = xattr_map_client(lo, in_name, &mapped_name);
if (ret < 0) {
fuse_reply_err(req, -ret);
return;
}
if (mapped_name) {
name = mapped_name;
}
}
inode = lo_inode(req, ino);
if (!inode) {
fuse_reply_err(req, EBADF);
g_free(mapped_name);
return;
}
@ -2390,21 +2467,38 @@ out:
}
lo_inode_put(lo, &inode);
g_free(mapped_name);
fuse_reply_err(req, saverr);
}
static void lo_removexattr(fuse_req_t req, fuse_ino_t ino, const char *name)
static void lo_removexattr(fuse_req_t req, fuse_ino_t ino, const char *in_name)
{
char procname[64];
const char *name;
char *mapped_name;
struct lo_data *lo = lo_data(req);
struct lo_inode *inode;
ssize_t ret;
int saverr;
int fd = -1;
mapped_name = NULL;
name = in_name;
if (lo->xattrmap) {
ret = xattr_map_client(lo, in_name, &mapped_name);
if (ret < 0) {
fuse_reply_err(req, -ret);
return;
}
if (mapped_name) {
name = mapped_name;
}
}
inode = lo_inode(req, ino);
if (!inode) {
fuse_reply_err(req, EBADF);
g_free(mapped_name);
return;
}
@ -2439,6 +2533,7 @@ out:
}
lo_inode_put(lo, &inode);
g_free(mapped_name);
fuse_reply_err(req, saverr);
}