TheCloud/fuse-overlayfs
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Merge pull request #78 from giuseppe/cleanups

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fuse-overlayfs: some cleanups
This commit is contained in:
Daniel J Walsh 2019-05-25 06:32:12 -04:00 committed by GitHub
commit 2cbd1c4a2d
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 37 additions and 35 deletions
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72
main.c
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@ -397,6 +397,12 @@ node_dirfd (struct ovl_node *n)
return n->layer->fd;
}
static int
upper_layer_fd (struct ovl_data *lo)
{
return lo->layers->fd;
}
static bool
has_prefix (const char *str, const char *pref)
{
@ -514,7 +520,7 @@ create_whiteout (struct ovl_data *lo, struct ovl_node *parent, const char *name,
ret = asprintf (&whiteout_path, "%s/%s", parent->path, name);
if (ret < 0)
return ret;
ret = mknodat (get_upper_layer (lo)->fd, whiteout_path, S_IFCHR|0700, makedev (0, 0));
ret = mknodat (upper_layer_fd (lo), whiteout_path, S_IFCHR|0700, makedev (0, 0));
if (ret == 0)
return 0;
@ -528,7 +534,7 @@ create_whiteout (struct ovl_data *lo, struct ovl_node *parent, const char *name,
ret = asprintf (&whiteout_wh_path, "%s/.wh.%s", parent->path, name);
if (ret < 0)
return ret;
fd = TEMP_FAILURE_RETRY (openat (get_upper_layer (lo)->fd, whiteout_wh_path, O_CREAT|O_WRONLY|O_NONBLOCK, 0700));
fd = TEMP_FAILURE_RETRY (openat (upper_layer_fd (lo), whiteout_wh_path, O_CREAT|O_WRONLY|O_NONBLOCK, 0700));
if (fd < 0 && errno != EEXIST)
return -1;
@ -560,12 +566,12 @@ delete_whiteout (struct ovl_data *lo, int dirfd, struct ovl_node *parent, const
if (ret < 0)
return ret;
if (TEMP_FAILURE_RETRY (fstatat (get_upper_layer (lo)->fd, whiteout_path, &st, AT_SYMLINK_NOFOLLOW)) == 0
if (TEMP_FAILURE_RETRY (fstatat (upper_layer_fd (lo), whiteout_path, &st, AT_SYMLINK_NOFOLLOW)) == 0
&& (st.st_mode & S_IFMT) == S_IFCHR
&& major (st.st_rdev) == 0
&& minor (st.st_rdev) == 0)
{
if (unlinkat (get_upper_layer (lo)->fd, whiteout_path, 0) < 0)
if (unlinkat (upper_layer_fd (lo), whiteout_path, 0) < 0)
return -1;
}
}
@ -593,7 +599,7 @@ delete_whiteout (struct ovl_data *lo, int dirfd, struct ovl_node *parent, const
if (ret < 0)
return ret;
if (unlinkat (get_upper_layer (lo)->fd, whiteout_path, 0) < 0 && errno != ENOENT)
if (unlinkat (upper_layer_fd (lo), whiteout_path, 0) < 0 && errno != ENOENT)
return -1;
}
@ -619,16 +625,16 @@ hide_node (struct ovl_data *lo, struct ovl_node *node, bool unlink_src)
if (unlink_src)
{
/* If the atomic rename+mknod failed, then fallback into doing it in two steps. */
if (syscall (SYS_renameat2, node_dirfd (node), node->path, lo->workdir_fd,
if (syscall (SYS_renameat2, upper_layer_fd (lo), node->path, lo->workdir_fd,
newpath, RENAME_WHITEOUT) < 0)
{
if (renameat (node_dirfd (node), node->path, lo->workdir_fd, newpath) < 0)
return -1;
if (node->parent)
{
if (create_whiteout (lo, node->parent, node->name, false, false) < 0)
return -1;
}
if (renameat (upper_layer_fd (lo), node->path, lo->workdir_fd, newpath) < 0)
return -1;
}
}
else
@ -949,10 +955,6 @@ make_ovl_node (const char *path, struct ovl_layer *layer, const char *name, ino_
if (fstat (fd, &st) == 0)
ret->ino = st.st_ino;
close (fd);
fd = TEMP_FAILURE_RETRY (openat (it->fd, path, O_RDONLY|O_NONBLOCK|O_NOFOLLOW));
if (fd < 0)
continue;
s = safe_read_xattr (&val, fd, PRIVILEGED_ORIGIN_XATTR, PATH_MAX);
if (s > 0)
{
@ -1084,7 +1086,7 @@ load_dir (struct ovl_data *lo, struct ovl_node *n, struct ovl_layer *layer, char
if (dp == NULL)
continue;
cleanup_fd = -1; /* It is not owned by dp. */
cleanup_fd = -1; /* It is now owned by dp. */
fd = dirfd (dp);
for (;;)
@ -1952,7 +1954,7 @@ create_node_directory (struct ovl_data *lo, struct ovl_node *src)
times[0] = st.st_atim;
times[1] = st.st_mtim;
ret = create_directory (lo, get_upper_layer (lo)->fd, src->path, times, src->parent, sfd, st.st_uid, st.st_gid, st.st_mode);
ret = create_directory (lo, upper_layer_fd (lo), src->path, times, src->parent, sfd, st.st_uid, st.st_gid, st.st_mode);
if (ret == 0)
{
src->layer = get_upper_layer (lo);
@ -2052,7 +2054,7 @@ copyup (struct ovl_data *lo, struct ovl_node *node)
p = new;
}
p[ret] = '\0';
ret = symlinkat (p, get_upper_layer (lo)->fd, node->path);
ret = symlinkat (p, upper_layer_fd (lo), node->path);
if (ret < 0)
goto exit;
goto success;
@ -2126,7 +2128,7 @@ copyup (struct ovl_data *lo, struct ovl_node *node)
goto exit;
/* Finally, move the file to its destination. */
ret = renameat (lo->workdir_fd, wd_tmp_file_name, get_upper_layer (lo)->fd, node->path);
ret = renameat (lo->workdir_fd, wd_tmp_file_name, upper_layer_fd (lo), node->path);
if (ret < 0)
goto exit;
@ -2137,7 +2139,7 @@ copyup (struct ovl_data *lo, struct ovl_node *node)
ret = asprintf (&whpath, "%s/.wh.%s", node->parent->path, node->name);
if (ret < 0)
goto exit;
if (unlinkat (get_upper_layer (lo)->fd, whpath, 0) < 0 && errno != ENOENT)
if (unlinkat (upper_layer_fd (lo), whpath, 0) < 0 && errno != ENOENT)
goto exit;
}
@ -2235,7 +2237,7 @@ empty_dir (struct ovl_data *lo, struct ovl_node *node)
cleanup_close int cleanup_fd = -1;
struct dirent *dent;
cleanup_fd = TEMP_FAILURE_RETRY (openat (get_upper_layer (lo)->fd, node->path, O_DIRECTORY));
cleanup_fd = TEMP_FAILURE_RETRY (openat (upper_layer_fd (lo), node->path, O_DIRECTORY));
if (cleanup_fd < 0)
return -1;
@ -2415,7 +2417,7 @@ ovl_setxattr (fuse_req_t req, fuse_ino_t ino, const char *name,
return;
}
fd = TEMP_FAILURE_RETRY (openat (node_dirfd (node), node->path, O_NONBLOCK));
fd = TEMP_FAILURE_RETRY (openat (upper_layer_fd (lo), node->path, O_NONBLOCK));
if (fd < 0)
{
fuse_reply_err (req, errno);
@ -2455,7 +2457,7 @@ ovl_removexattr (fuse_req_t req, fuse_ino_t ino, const char *name)
return;
}
fd = TEMP_FAILURE_RETRY (openat (node_dirfd (node), node->path, O_NONBLOCK));
fd = TEMP_FAILURE_RETRY (openat (upper_layer_fd (lo), node->path, O_NONBLOCK));
if (fd < 0)
{
fuse_reply_err (req, errno);
@ -2543,13 +2545,13 @@ ovl_do_open (fuse_req_t req, fuse_ino_t parent, const char *name, int flags, mod
unlinkat (lo->workdir_fd, wd_tmp_file_name, 0);
return ret;
}
if (unlinkat (get_upper_layer (lo)->fd, path, 0) < 0 && errno != ENOENT)
if (unlinkat (upper_layer_fd (lo), path, 0) < 0 && errno != ENOENT)
return -1;
if (delete_whiteout (lo, -1, p, name) < 0)
return -1;
if (renameat (lo->workdir_fd, wd_tmp_file_name, get_upper_layer (lo)->fd, path) < 0)
if (renameat (lo->workdir_fd, wd_tmp_file_name, upper_layer_fd (lo), path) < 0)
{
unlinkat (lo->workdir_fd, wd_tmp_file_name, 0);
return -1;
@ -2583,7 +2585,7 @@ ovl_do_open (fuse_req_t req, fuse_ino_t parent, const char *name, int flags, mod
if (n == NULL)
return -1;
return TEMP_FAILURE_RETRY (openat (node_dirfd (n), n->path, flags, mode));
return TEMP_FAILURE_RETRY (openat (upper_layer_fd (lo), n->path, flags, mode));
}
}
@ -2760,7 +2762,7 @@ ovl_setattr (fuse_req_t req, fuse_ino_t ino, struct stat *attr, int to_set, stru
return;
}
dirfd = node_dirfd (node);
dirfd = upper_layer_fd (lo);
if (TEMP_FAILURE_RETRY (fstatat (dirfd, node->path, &old_st, AT_SYMLINK_NOFOLLOW)) < 0)
{
@ -2918,20 +2920,20 @@ ovl_link (fuse_req_t req, fuse_ino_t ino, fuse_ino_t newparent, const char *newn
return;
}
if (linkat (node_dirfd (newparentnode), node->path, lo->workdir_fd, wd_tmp_file_name, 0) < 0)
if (linkat (upper_layer_fd (lo), node->path, lo->workdir_fd, wd_tmp_file_name, 0) < 0)
{
fuse_reply_err (req, errno);
return;
}
if (renameat (lo->workdir_fd, wd_tmp_file_name, node_dirfd (newparentnode), path) < 0)
if (renameat (lo->workdir_fd, wd_tmp_file_name, upper_layer_fd (lo), path) < 0)
{
fuse_reply_err (req, errno);
return;
}
else
{
cleanup_close int dfd = TEMP_FAILURE_RETRY (openat (node_dirfd (newparentnode), path, O_WRONLY|O_NONBLOCK));
cleanup_close int dfd = TEMP_FAILURE_RETRY (openat (upper_layer_fd (lo), path, O_WRONLY|O_NONBLOCK));
if (dfd >= 0)
{
bool set = false;
@ -3052,7 +3054,7 @@ ovl_symlink (fuse_req_t req, const char *link, fuse_ino_t parent, const char *na
return;
}
ret = renameat (lo->workdir_fd, wd_tmp_file_name, get_upper_layer (lo)->fd, path);
ret = renameat (lo->workdir_fd, wd_tmp_file_name, upper_layer_fd (lo), path);
if (ret < 0)
{
fuse_reply_err (req, errno);
@ -3150,7 +3152,7 @@ ovl_rename_exchange (fuse_req_t req, fuse_ino_t parent, const char *name,
if (pnode == NULL)
goto error;
ret = TEMP_FAILURE_RETRY (openat (node_dirfd (pnode), pnode->path, O_DIRECTORY));
ret = TEMP_FAILURE_RETRY (openat (upper_layer_fd (lo), pnode->path, O_DIRECTORY));
if (ret < 0)
goto error;
srcfd = ret;
@ -3159,7 +3161,7 @@ ovl_rename_exchange (fuse_req_t req, fuse_ino_t parent, const char *name,
if (destpnode == NULL)
goto error;
ret = TEMP_FAILURE_RETRY (openat (node_dirfd (destpnode), destpnode->path, O_DIRECTORY));
ret = TEMP_FAILURE_RETRY (openat (upper_layer_fd (lo), destpnode->path, O_DIRECTORY));
if (ret < 0)
goto error;
destfd = ret;
@ -3282,7 +3284,7 @@ ovl_rename_direct (fuse_req_t req, fuse_ino_t parent, const char *name,
if (pnode == NULL)
goto error;
ret = TEMP_FAILURE_RETRY (openat (node_dirfd (pnode), pnode->path, O_DIRECTORY));
ret = TEMP_FAILURE_RETRY (openat (upper_layer_fd (lo), pnode->path, O_DIRECTORY));
if (ret < 0)
goto error;
srcfd = ret;
@ -3291,7 +3293,7 @@ ovl_rename_direct (fuse_req_t req, fuse_ino_t parent, const char *name,
if (destpnode == NULL)
goto error;
ret = TEMP_FAILURE_RETRY (openat (node_dirfd (destpnode), destpnode->path, O_DIRECTORY));
ret = TEMP_FAILURE_RETRY (openat (upper_layer_fd (lo), destpnode->path, O_DIRECTORY));
if (ret < 0)
goto error;
destfd = ret;
@ -3456,7 +3458,7 @@ ovl_statfs (fuse_req_t req, fuse_ino_t ino)
if (ovl_debug (req))
fprintf (stderr, "ovl_statfs(ino=%" PRIu64 "s)\n", ino);
ret = fstatvfs (get_upper_layer (lo)->fd, &sfs);
ret = fstatvfs (upper_layer_fd (lo), &sfs);
if (ret < 0)
{
fuse_reply_err (req, errno);
@ -3614,7 +3616,7 @@ ovl_mknod (fuse_req_t req, fuse_ino_t parent, const char *name, mode_t mode, dev
return;
}
ret = renameat (lo->workdir_fd, wd_tmp_file_name, get_upper_layer (lo)->fd, path);
ret = renameat (lo->workdir_fd, wd_tmp_file_name, upper_layer_fd (lo), path);
if (ret < 0)
{
fuse_reply_err (req, errno);
@ -3700,7 +3702,7 @@ ovl_mkdir (fuse_req_t req, fuse_ino_t parent, const char *name, mode_t mode)
return;
}
ret = create_directory (lo, get_upper_layer (lo)->fd, path, NULL, pnode, -1,
ret = create_directory (lo, upper_layer_fd (lo), path, NULL, pnode, -1,
get_uid (lo, ctx->uid), get_gid (lo, ctx->gid), mode & ~ctx->umask);
if (ret < 0)
{