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Use *at() functions for native filesystem commits 

This is just an efficiency optimization.  We're getting fairly close
to all of the hot code paths using `*at()`.

Note that we end up maintaining a half-duplicate code path set here,
because we still need to support commits from an arbitrary GFile *,
which in a possible common case is an OSTree commit.

I think it's worth it though.
This commit is contained in:
Colin Walters 2014-12-15 22:23:37 -05:00
parent cf8d6848b3
commit 026c5c60d3
4 changed files with 250 additions and 34 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

208
src/libostree/ostree-repo-commit.c
View File

@ -24,6 +24,7 @@
#include <glib-unix.h>
#include <gio/gfiledescriptorbased.h>
#include <gio/gunixinputstream.h>
#include "otutil.h"
#include "libgsystem.h"
@ -1901,6 +1902,8 @@ get_modified_xattrs (OstreeRepo *self,
const char *relpath,
GFileInfo *file_info,
GFile *path,
int dfd,
const char *dfd_subpath,
GVariant **out_xattrs,
GCancellable *cancellable,
GError **error)
@ -1914,10 +1917,27 @@ get_modified_xattrs (OstreeRepo *self,
modifier->xattr_user_data);
}
else if (!(modifier && (modifier->flags & OSTREE_REPO_COMMIT_MODIFIER_FLAGS_SKIP_XATTRS) > 0))
{
if (path)
{
if (!gs_file_get_all_xattrs (path, &ret_xattrs, cancellable, error))
goto out;
}
else if (dfd_subpath == NULL)
{
g_assert (dfd != -1);
if (!gs_fd_get_all_xattrs (dfd, &ret_xattrs,
cancellable, error))
goto out;
}
else
{
g_assert (dfd != -1);
if (!gs_dfd_and_name_get_all_xattrs (dfd, dfd_subpath, &ret_xattrs,
cancellable, error))
goto out;
}
}
if (modifier && modifier->sepolicy)
{
@ -1964,11 +1984,20 @@ write_directory_to_mtree_internal (OstreeRepo *self,
GPtrArray *path,
GCancellable *cancellable,
GError **error);
static gboolean
write_dfd_iter_to_mtree_internal (OstreeRepo *self,
GSDirFdIterator *src_dfd_iter,
OstreeMutableTree *mtree,
OstreeRepoCommitModifier *modifier,
GPtrArray *path,
GCancellable *cancellable,
GError **error);
static gboolean
write_directory_content_to_mtree_internal (OstreeRepo *self,
OstreeRepoFile *repo_dir,
GFileEnumerator *dir_enum,
GSDirFdIterator *dfd_iter,
GFileInfo *child_info,
OstreeMutableTree *mtree,
OstreeRepoCommitModifier *modifier,
@ -1985,6 +2014,8 @@ write_directory_content_to_mtree_internal (OstreeRepo *self,
GFileType file_type;
OstreeRepoCommitFilterResult filter_result;
g_assert (dir_enum != NULL || dfd_iter != NULL);
name = g_file_info_get_name (child_info);
g_ptr_array_add (path, (char*)name);
@ -2000,8 +2031,6 @@ write_directory_content_to_mtree_internal (OstreeRepo *self,
goto out;
}
child = g_file_enumerator_get_child (dir_enum, child_info);
file_type = g_file_info_get_file_type (child_info);
switch (file_type)
{
@ -2016,18 +2045,37 @@ write_directory_content_to_mtree_internal (OstreeRepo *self,
goto out;
}
if (dir_enum != NULL)
child = g_file_enumerator_get_child (dir_enum, child_info);
if (file_type == G_FILE_TYPE_DIRECTORY)
{
if (!ostree_mutable_tree_ensure_dir (mtree, name, &child_mtree, error))
goto out;
if (dir_enum != NULL)
{
if (!write_directory_to_mtree_internal (self, child, child_mtree,
modifier, path,
cancellable, error))
goto out;
}
else
{
gs_dirfd_iterator_cleanup GSDirFdIterator child_dfd_iter = { 0, };
if (!gs_dirfd_iterator_init_at (dfd_iter->fd, name, FALSE, &child_dfd_iter, error))
goto out;
if (!write_dfd_iter_to_mtree_internal (self, &child_dfd_iter, child_mtree,
modifier, path,
cancellable, error))
goto out;
}
}
else if (repo_dir)
{
g_assert (dir_enum != NULL);
g_debug ("Adding: %s", gs_file_get_path_cached (child));
if (!ostree_mutable_tree_replace_file (mtree, name,
ostree_repo_file_get_checksum ((OstreeRepoFile*) child),
@ -2044,7 +2092,6 @@ write_directory_content_to_mtree_internal (OstreeRepo *self,
gs_free guchar *child_file_csum = NULL;
gs_free char *tmp_checksum = NULL;
g_debug ("Adding: %s", gs_file_get_path_cached (child));
loose_checksum = devino_cache_lookup (self, child_info);
if (loose_checksum)
@ -2056,14 +2103,27 @@ write_directory_content_to_mtree_internal (OstreeRepo *self,
else
{
if (g_file_info_get_file_type (modified_info) == G_FILE_TYPE_REGULAR)
{
if (child != NULL)
{
file_input = (GInputStream*)g_file_read (child, cancellable, error);
if (!file_input)
goto out;
}
else
{
int filefd = openat (dfd_iter->fd, name, O_RDONLY | O_CLOEXEC, 0);
if (filefd == -1)
{
gs_set_error_from_errno (error, errno);
goto out;
}
file_input = (GInputStream*)g_unix_input_stream_new (filefd, TRUE);
}
}
if (!get_modified_xattrs (self, modifier,
child_relpath, child_info, child,
child_relpath, child_info, child, dfd_iter->fd, name,
&xattrs,
cancellable, error))
goto out;
@ -2107,11 +2167,12 @@ write_directory_to_mtree_internal (OstreeRepo *self,
gs_unref_object GFileEnumerator *dir_enum = NULL;
gs_unref_object GFileInfo *child_info = NULL;
if (dir)
g_debug ("Examining: %s", gs_file_get_path_cached (dir));
/* If the directory is already in the repository, we can try to
* reuse checksums to skip checksumming. */
if (OSTREE_IS_REPO_FILE (dir) && modifier == NULL)
if (dir && OSTREE_IS_REPO_FILE (dir) && modifier == NULL)
repo_dir = (OstreeRepoFile *) dir;
if (repo_dir)
@ -2154,8 +2215,8 @@ write_directory_to_mtree_internal (OstreeRepo *self,
if (filter_result == OSTREE_REPO_COMMIT_FILTER_ALLOW)
{
g_debug ("Adding: %s", gs_file_get_path_cached (dir));
if (!get_modified_xattrs (self, modifier, relpath, child_info, dir,
if (!get_modified_xattrs (self, modifier, relpath, child_info,
dir, -1, NULL,
&xattrs,
cancellable, error))
goto out;
@ -2193,7 +2254,8 @@ write_directory_to_mtree_internal (OstreeRepo *self,
if (child_info == NULL)
break;
if (!write_directory_content_to_mtree_internal (self, repo_dir, dir_enum, child_info,
if (!write_directory_content_to_mtree_internal (self, repo_dir, dir_enum, NULL,
child_info,
mtree, modifier, path,
cancellable, error))
goto out;
@ -2205,6 +2267,121 @@ write_directory_to_mtree_internal (OstreeRepo *self,
return ret;
}
static gboolean
write_dfd_iter_to_mtree_internal (OstreeRepo *self,
GSDirFdIterator *src_dfd_iter,
OstreeMutableTree *mtree,
OstreeRepoCommitModifier *modifier,
GPtrArray *path,
GCancellable *cancellable,
GError **error)
{
gboolean ret = FALSE;
gs_unref_object GFileInfo *child_info = NULL;
gs_unref_object GFileInfo *modified_info = NULL;
gs_unref_variant GVariant *xattrs = NULL;
gs_free guchar *child_file_csum = NULL;
gs_free char *tmp_checksum = NULL;
gs_free char *relpath = NULL;
OstreeRepoCommitFilterResult filter_result;
struct stat dir_stbuf;
if (fstat (src_dfd_iter->fd, &dir_stbuf) != 0)
{
gs_set_error_from_errno (error, errno);
goto out;
}
child_info = _ostree_header_gfile_info_new (dir_stbuf.st_mode, dir_stbuf.st_uid, dir_stbuf.st_gid);
if (modifier != NULL)
{
relpath = ptrarray_path_join (path);
filter_result = apply_commit_filter (self, modifier, relpath, child_info, &modified_info);
}
else
{
filter_result = OSTREE_REPO_COMMIT_FILTER_ALLOW;
modified_info = g_object_ref (child_info);
}
if (filter_result == OSTREE_REPO_COMMIT_FILTER_ALLOW)
{
if (!get_modified_xattrs (self, modifier, relpath, modified_info,
NULL, src_dfd_iter->fd, NULL,
&xattrs,
cancellable, error))
goto out;
if (!_ostree_repo_write_directory_meta (self, modified_info, xattrs, &child_file_csum,
cancellable, error))
goto out;
g_free (tmp_checksum);
tmp_checksum = ostree_checksum_from_bytes (child_file_csum);
ostree_mutable_tree_set_metadata_checksum (mtree, tmp_checksum);
}
if (filter_result != OSTREE_REPO_COMMIT_FILTER_ALLOW)
{
ret = TRUE;
goto out;
}
while (TRUE)
{
struct dirent *dent;
struct stat stbuf;
gs_unref_object GFileInfo *child_info = NULL;
if (!gs_dirfd_iterator_next_dent (src_dfd_iter, &dent, cancellable, error))
goto out;
if (dent == NULL)
break;
if (fstatat (src_dfd_iter->fd, dent->d_name, &stbuf, AT_SYMLINK_NOFOLLOW) == -1)
{
gs_set_error_from_errno (error, errno);
goto out;
}
child_info = _ostree_header_gfile_info_new (stbuf.st_mode, stbuf.st_uid, stbuf.st_gid);
g_file_info_set_name (child_info, dent->d_name);
if (S_ISREG (stbuf.st_mode))
{
g_file_info_set_size (child_info, stbuf.st_size);
}
else if (S_ISLNK (stbuf.st_mode))
{
if (!ot_readlinkat_gfile_info (src_dfd_iter->fd, dent->d_name,
child_info, cancellable, error))
goto out;
}
else if (S_ISDIR (stbuf.st_mode))
;
else
{
g_set_error (error, G_IO_ERROR, G_IO_ERROR_FAILED,
"Not a regular file or symlink: %s",
dent->d_name);
goto out;
}
if (!write_directory_content_to_mtree_internal (self, NULL, NULL, src_dfd_iter,
child_info,
mtree, modifier, path,
cancellable, error))
goto out;
}
ret = TRUE;
out:
return ret;
}
/**
* ostree_repo_write_directory_to_mtree:
* @self: Repo
@ -2234,9 +2411,24 @@ ostree_repo_write_directory_to_mtree (OstreeRepo *self,
}
path = g_ptr_array_new ();
if (g_file_is_native (dir))
{
gs_dirfd_iterator_cleanup GSDirFdIterator dfd_iter = { 0, };
if (!gs_dirfd_iterator_init_at (AT_FDCWD, gs_file_get_path_cached (dir), FALSE,
&dfd_iter, error))
goto out;
if (!write_dfd_iter_to_mtree_internal (self, &dfd_iter, mtree, modifier, path,
cancellable, error))
goto out;
}
else
{
if (!write_directory_to_mtree_internal (self, dir, mtree, modifier, path,
cancellable, error))
goto out;
}
ret = TRUE;
out:

14
src/libostree/ostree-repo.c
View File

@ -1810,20 +1810,10 @@ query_info_for_bare_content_object (OstreeRepo *self,
}
else if (S_ISLNK (stbuf.st_mode))
{
char targetbuf[PATH_MAX+1];
ssize_t len;
do
len = readlinkat (self->objects_dir_fd, loose_path_buf, targetbuf, sizeof (targetbuf) - 1);
while (G_UNLIKELY (len == -1 && errno == EINTR));
if (len == -1)
{
gs_set_error_from_errno (error, errno);
if (!ot_readlinkat_gfile_info (self->objects_dir_fd, loose_path_buf,
ret_info, cancellable, error))
goto out;
}
targetbuf[len] = '\0';
g_file_info_set_symlink_target (ret_info, targetbuf);
}
else
{
g_set_error (error, G_IO_ERROR, G_IO_ERROR_FAILED,

28
src/libotutil/ot-fs-utils.c
View File

@ -115,3 +115,31 @@ ot_lsetxattrat (int dfd,
return TRUE;
}
gboolean
ot_readlinkat_gfile_info (int dfd,
const char *path,
GFileInfo *target_info,
GCancellable *cancellable,
GError **error)
{
gboolean ret = FALSE;
char targetbuf[PATH_MAX+1];
ssize_t len;
do
len = readlinkat (dfd, path, targetbuf, sizeof (targetbuf) - 1);
while (G_UNLIKELY (len == -1 && errno == EINTR));
if (len == -1)
{
gs_set_error_from_errno (error, errno);
goto out;
}
targetbuf[len] = '\0';
g_file_info_set_symlink_target (target_info, targetbuf);
ret = TRUE;
out:
return ret;
}

6
src/libotutil/ot-fs-utils.h
View File

@ -44,5 +44,11 @@ gboolean ot_lsetxattrat (int dfd,
int flags,
GError **error);
gboolean ot_readlinkat_gfile_info (int dfd,
const char *path,
GFileInfo *target_info,
GCancellable *cancellable,
GError **error);
G_END_DECLS