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core: Use linkat() rather than link() in threaded checkouts

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This seems to work around a likely Linux kernel VFS bug, where I
randomly see ENOENT on link() when we *definitely* called mkdir() at
an earlier point in time.
This commit is contained in:
Colin Walters 2012-10-15 10:44:20 -04:00
parent d6956bfc19
commit 1642310486
1 changed files with 23 additions and 4 deletions
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27
src/libostree/ostree-repo.c
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@ -3196,6 +3196,7 @@ checkout_file_hardlink (OstreeRepo *self,
OstreeRepoCheckoutOverwriteMode overwrite_mode,
GFile *source,
GFile *destination,
int dirfd,
gboolean *out_was_supported,
GCancellable *cancellable,
GError **error)
@ -3204,7 +3205,11 @@ checkout_file_hardlink (OstreeRepo *self,
gboolean ret_was_supported = FALSE;
ot_lobj GFile *dir = NULL;
if (link (ot_gfile_get_path_cached (source), ot_gfile_get_path_cached (destination)) != -1)
if (dirfd != -1 &&
linkat (-1, ot_gfile_get_path_cached (source),
dirfd, ot_gfile_get_basename_cached (destination), 0) != -1)
ret_was_supported = TRUE;
else if (link (ot_gfile_get_path_cached (source), ot_gfile_get_path_cached (destination)) != -1)
ret_was_supported = TRUE;
else if (errno == EMLINK || errno == EXDEV || errno == EPERM)
{
@ -3318,6 +3323,7 @@ typedef struct {
OstreeRepoCheckoutMode mode;
OstreeRepoCheckoutOverwriteMode overwrite_mode;
GFile *destination;
int dirfd;
OstreeRepoFile *source;
GFileInfo *source_info;
GCancellable *cancellable;
@ -3447,7 +3453,7 @@ checkout_file_thread (GSimpleAsyncResult *result,
/* If we found one, try hardlinking */
if (!checkout_file_hardlink (checkout_data->repo, checkout_data->mode,
checkout_data->overwrite_mode, loose_path,
checkout_data->destination,
checkout_data->destination, checkout_data->dirfd,
&hardlink_supported, cancellable, error))
{
g_prefix_error (error, "Hardlinking loose object %s to %s: ", checksum,
@ -3487,6 +3493,7 @@ checkout_one_file_async (OstreeRepo *self,
OstreeRepoFile *source,
GFileInfo *source_info,
GFile *destination,
int dirfd,
GCancellable *cancellable,
GAsyncReadyCallback callback,
gpointer user_data)
@ -3498,6 +3505,7 @@ checkout_one_file_async (OstreeRepo *self,
checkout_data->mode = mode;
checkout_data->overwrite_mode = overwrite_mode;
checkout_data->destination = g_object_ref (destination);
checkout_data->dirfd = dirfd;
checkout_data->source = g_object_ref (source);
checkout_data->source_info = g_object_ref (source_info);
checkout_data->cancellable = cancellable ? g_object_ref (cancellable) : NULL;
@ -3542,6 +3550,8 @@ typedef struct {
gboolean caught_error;
GError *error;
DIR *dir_handle;
guint pending_ops;
GMainLoop *loop;
GSimpleAsyncResult *result;
@ -3557,6 +3567,8 @@ checkout_tree_async_data_free (gpointer data)
g_clear_object (&checkout_data->source);
g_clear_object (&checkout_data->source_info);
g_clear_object (&checkout_data->cancellable);
if (checkout_data->dir_handle)
(void) closedir (checkout_data->dir_handle);
g_free (checkout_data);
}
@ -3667,8 +3679,8 @@ on_got_next_files (GObject *src,
checkout_one_file_async (data->repo, data->mode,
data->overwrite_mode,
(OstreeRepoFile*)src_child, file_info,
dest_path, data->cancellable,
on_one_file_checked_out,
dest_path, dirfd(data->dir_handle),
data->cancellable, on_one_file_checked_out,
data);
}
data->pending_ops++;
@ -3726,6 +3738,13 @@ ostree_repo_checkout_tree_async (OstreeRepo *self,
cancellable, error))
goto out;
checkout_data->dir_handle = opendir (ot_gfile_get_path_cached (checkout_data->destination));
if (!checkout_data->dir_handle)
{
ot_util_set_error_from_errno (error, errno);
goto out;
}
g_clear_pointer (&xattrs, (GDestroyNotify) g_variant_unref);
dir_enum = g_file_enumerate_children ((GFile*)checkout_data->source,