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main: simplify setattr

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always use the /proc/self/fd/FD path when the path doesn't refer to a
directory or regular file.

commit 0b0c7a3a01dae4de65ba79016a111d794c1d1719 introduced the
regression.

Closes: https://github.com/containers/fuse-overlayfs/issues/99

Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
This commit is contained in:
Giuseppe Scrivano 2019-08-07 22:01:01 +02:00 committed by Giuseppe Scrivano
parent 80eb59d71d
commit 1faf62ce32
No known key found for this signature in database
GPG Key ID: 67E38F7A8BA21772
1 changed files with 38 additions and 25 deletions
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63
main.c
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@ -1605,7 +1605,6 @@ do_lookup_file (struct ovl_data *lo, fuse_ino_t parent, const char *name)
}
strconcat3 (whpath, PATH_MAX, pnode->path, "/.wh.", name);
ret = file_exists_at (it->fd, whpath);
if (ret < 0 && errno != ENOENT)
return NULL;
@ -3245,8 +3244,8 @@ ovl_setattr (fuse_req_t req, fuse_ino_t ino, struct stat *attr, int to_set, stru
uid_t uid;
gid_t gid;
int ret;
int fd;
char proc_path[PATH_MAX];
int fd = -1;
char path[PATH_MAX];
if (UNLIKELY (ovl_debug (req)))
fprintf (stderr, "ovl_setattr(ino=%" PRIu64 "s, to_set=%d)\n", ino, to_set);
@ -3274,20 +3273,28 @@ ovl_setattr (fuse_req_t req, fuse_ino_t ino, struct stat *attr, int to_set, stru
fd = fi->fh; // use existing fd if fuse_file_info is available
else
{
struct stat st;
int dirfd = node_dirfd (node);
cleaned_up_fd = fd = TEMP_FAILURE_RETRY (openat (dirfd, node->path, O_NOFOLLOW|O_NONBLOCK|O_WRONLY));
if (fd < 0)
ret = fstatat (dirfd, node->path, &st, AT_SYMLINK_NOFOLLOW);
if (ret < 0)
{
if (errno == EISDIR)
goto handle_eisdir;
if (errno == ELOOP)
goto handle_eloop;
fuse_reply_err (req, errno);
return;
}
handle_eisdir:
switch (st.st_mode & S_IFMT)
{
case S_IFREG:
cleaned_up_fd = fd = TEMP_FAILURE_RETRY (openat (dirfd, node->path, O_NOFOLLOW|O_NONBLOCK|O_WRONLY));
if (fd < 0)
{
fuse_reply_err (req, errno);
return;
}
break;
case S_IFDIR:
cleaned_up_fd = fd = TEMP_FAILURE_RETRY (openat (dirfd, node->path, O_NOFOLLOW|O_NONBLOCK));
if (fd < 0)
{
@ -3296,16 +3303,22 @@ handle_eisdir:
fuse_reply_err (req, errno);
return;
}
handle_eloop:
/* It is a symlink and it cannot be used directly. Fallback to the /proc/fd/$FD path. */
cleaned_up_fd = TEMP_FAILURE_RETRY (openat (dirfd, node->path, O_PATH|O_NOFOLLOW|O_NONBLOCK));
if (cleaned_up_fd < 0)
{
fuse_reply_err (req, errno);
return;
}
sprintf (proc_path, "/proc/self/fd/%d", cleaned_up_fd);
}
break;
case S_IFLNK:
cleaned_up_fd = TEMP_FAILURE_RETRY (openat (dirfd, node->path, O_PATH|O_NOFOLLOW|O_NONBLOCK));
if (cleaned_up_fd < 0)
{
fuse_reply_err (req, errno);
return;
}
sprintf (path, "/proc/self/fd/%d", cleaned_up_fd);
break;
default:
strconcat3 (path, PATH_MAX, get_upper_layer (lo)->path, "/", node->path);
break;
}
}
@ -3329,7 +3342,7 @@ handle_eloop:
if (fd >= 0)
ret = futimens (fd, times);
else
ret = utimensat (AT_FDCWD, proc_path, times, AT_SYMLINK_NOFOLLOW);
ret = utimensat (AT_FDCWD, path, times, AT_SYMLINK_NOFOLLOW);
if (ret < 0)
{
fuse_reply_err (req, errno);
@ -3342,7 +3355,7 @@ handle_eloop:
if (fd >= 0)
ret = fchmod (fd, attr->st_mode);
else
ret = chmod (proc_path, attr->st_mode);
ret = chmod (path, attr->st_mode);
if (ret < 0)
{
fuse_reply_err (req, errno);
@ -3355,7 +3368,7 @@ handle_eloop:
if (fd >= 0)
ret = ftruncate (fd, attr->st_size);
else
ret = truncate (proc_path, attr->st_size);
ret = truncate (path, attr->st_size);
if (ret < 0)
{
fuse_reply_err (req, errno);
@ -3375,7 +3388,7 @@ handle_eloop:
if (fd >= 0)
ret = fchown (fd, uid, gid);
else
ret = chown (proc_path, uid, gid);
ret = chown (path, uid, gid);
if (ret < 0)
{
fuse_reply_err (req, errno);
@ -3383,7 +3396,7 @@ handle_eloop:
}
}
if (do_getattr (req, &e, node, fd, proc_path) < 0)
if (do_getattr (req, &e, node, fd, path) < 0)
{
fuse_reply_err (req, errno);
return;