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gfile: Eliminate a stat() call from the file copy code

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The start of the `g_file_copy()` implementation stats the source file to
find all the attributes to copy onto the destination file, so it makes
sense to get it to store the source file size at the same time.

This saves a subsequent `stat()` call on the source FD in the btrfs
reflink or splice code. Every little helps.

Signed-off-by: Philip Withnall <pwithnall@endlessos.org>
This commit is contained in:
Philip Withnall 2023-03-17 13:16:02 +00:00
parent 63e1e83c33
commit 0da948a5d1
1 changed files with 13 additions and 10 deletions
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23
gio/gfile.c
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@ -2807,6 +2807,11 @@ g_file_build_attribute_list_for_copy (GFile *file,
first = TRUE;
s = g_string_new ("");
/* Always query the source file size, even though we can’t set that on the
* destination. This is useful for the copy functions. */
first = FALSE;
g_string_append (s, G_FILE_ATTRIBUTE_STANDARD_SIZE);
if (attributes)
{
for (i = 0; i < attributes->n_infos; i++)
@ -3042,6 +3047,7 @@ retry:
static gboolean
splice_stream_with_progress (GInputStream *in,
GFileInfo *in_info,
GOutputStream *out,
GCancellable *cancellable,
GFileProgressCallback progress_callback,
@ -3085,10 +3091,8 @@ splice_stream_with_progress (GInputStream *in,
/* avoid performance impact of querying total size when it's not needed */
if (progress_callback)
{
struct stat sbuf;
if (fstat (fd_in, &sbuf) == 0)
total_size = sbuf.st_size;
g_assert (g_file_info_has_attribute (in_info, G_FILE_ATTRIBUTE_STANDARD_SIZE));
total_size = g_file_info_get_size (in_info);
}
if (total_size == -1)
@ -3151,6 +3155,7 @@ splice_stream_with_progress (GInputStream *in,
#ifdef __linux__
static gboolean
btrfs_reflink_with_progress (GInputStream *in,
GFileInfo *in_info,
GOutputStream *out,
GFileInfo *info,
GCancellable *cancellable,
@ -3169,10 +3174,8 @@ btrfs_reflink_with_progress (GInputStream *in,
/* avoid performance impact of querying total size when it's not needed */
if (progress_callback)
{
struct stat sbuf;
if (fstat (fd_in, &sbuf) == 0)
total_size = sbuf.st_size;
g_assert (g_file_info_has_attribute (in_info, G_FILE_ATTRIBUTE_STANDARD_SIZE));
total_size = g_file_info_get_size (in_info);
}
if (total_size == -1)
@ -3376,7 +3379,7 @@ file_copy_fallback (GFile *source,
{
GError *reflink_err = NULL;
if (!btrfs_reflink_with_progress (in, out, info, cancellable,
if (!btrfs_reflink_with_progress (in, info, out, info, cancellable,
progress_callback, progress_callback_data,
&reflink_err))
{
@ -3403,7 +3406,7 @@ file_copy_fallback (GFile *source,
{
GError *splice_err = NULL;
if (!splice_stream_with_progress (in, out, cancellable,
if (!splice_stream_with_progress (in, info, out, cancellable,
progress_callback, progress_callback_data,
&splice_err))
{