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@@ -0,0 +1,126 @@
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+From 093a8b4bfaba60005f14493ce7ef11ed665a0176 Mon Sep 17 00:00:00 2001
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+From: =?UTF-8?q?P=C3=A1draig=20Brady?= <[email protected]>
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+Date: Thu, 23 Mar 2023 13:19:04 +0000
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+Subject: [PATCH] copy: fix --reflink=auto to fallback in more cases
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+
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+On restricted systems like android or some containers,
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+FICLONE could return EPERM, EACCES, or ENOTTY,
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+which would have induced the command to fail to copy
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+rather than falling back to a more standard copy.
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+
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+* src/copy.c (is_terminal_failure): A new function refactored
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+from handle_clone_fail().
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+(is_CLONENOTSUP): Merge in the handling of EACCES, ENOTTY, EPERM
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+as they also pertain to determination of whether cloning is supported
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+if we ever use this function in that context.
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+(handle_clone_fail): Use is_terminal_failure() in all cases,
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+so that we assume a terminal failure in less errno cases.
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+* NEWS: Mention the bug fix.
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+Addresses https://bugs.gnu.org/62404
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+---
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+--- a/src/copy.c
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++++ b/src/copy.c
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+@@ -278,15 +278,27 @@ create_hole (int fd, char const *name, b
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+ }
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+
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+
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+-/* Whether the errno from FICLONE, or copy_file_range
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+- indicates operation is not supported for this file or file system. */
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++/* Whether the errno indicates the operation is a transient failure.
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++ I.e., a failure that would indicate the operation _is_ supported,
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++ but has failed in a terminal way. */
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++
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++static bool
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++is_terminal_error (int err)
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++{
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++ return err == EIO || err == ENOMEM || err == ENOSPC || err == EDQUOT;
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++}
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++
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++
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++/* Whether the errno from FICLONE, or copy_file_range indicates
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++ the operation is not supported/allowed for this file or process. */
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+
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+ static bool
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+ is_CLONENOTSUP (int err)
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+ {
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+- return err == ENOSYS || is_ENOTSUP (err)
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++ return err == ENOSYS || err == ENOTTY || is_ENOTSUP (err)
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+ || err == EINVAL || err == EBADF
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+- || err == EXDEV || err == ETXTBSY;
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++ || err == EXDEV || err == ETXTBSY
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++ || err == EPERM || err == EACCES;
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+ }
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+
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+
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+@@ -339,20 +351,18 @@ sparse_copy (int src_fd, int dest_fd, ch
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+ {
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+ copy_debug.offload = COPY_DEBUG_UNSUPPORTED;
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+
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+- if (is_CLONENOTSUP (errno))
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+- break;
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+-
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+- /* copy_file_range might not be enabled in seccomp filters,
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+- so retry with a standard copy. EPERM can also occur
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+- for immutable files, but that would only be in the edge case
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+- where the file is made immutable after creating/truncating,
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++ /* Consider operation unsupported only if no data copied.
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++ For example, EPERM could occur if copy_file_range not enabled
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++ in seccomp filters, so retry with a standard copy. EPERM can
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++ also occur for immutable files, but that would only be in the
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++ edge case where the file is made immutable after creating,
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+ in which case the (more accurate) error is still shown. */
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+- if (errno == EPERM && *total_n_read == 0)
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++ if (*total_n_read == 0 && is_CLONENOTSUP (errno))
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+ break;
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+
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+ /* ENOENT was seen sometimes across CIFS shares, resulting in
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+ no data being copied, but subsequent standard copies succeed. */
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+- if (errno == ENOENT && *total_n_read == 0)
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++ if (*total_n_read == 0 && errno == ENOENT)
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+ break;
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+
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+ if (errno == EINTR)
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+@@ -1172,17 +1182,15 @@ handle_clone_fail (int dst_dirfd, char c
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+ char const* src_name, char const* dst_name,
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+ int dest_desc, bool new_dst, enum Reflink_type reflink_mode)
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+ {
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+- /* If the clone operation is creating the destination,
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+- then don't try and cater for all non transient file system errors,
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+- and instead only cater for specific transient errors. */
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+- bool transient_failure;
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+- if (dest_desc < 0) /* currently for fclonefileat(). */
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+- transient_failure = errno == EIO || errno == ENOMEM
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+- || errno == ENOSPC || errno == EDQUOT;
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+- else /* currently for FICLONE. */
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+- transient_failure = ! is_CLONENOTSUP (errno);
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++ /* When the clone operation fails, report failure only with errno values
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++ known to mean trouble when the clone is supported and called properly.
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++ Do not report failure merely because !is_CLONENOTSUP (errno),
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++ as systems may yield oddball errno values here with FICLONE.
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++ Also is_CLONENOTSUP() is not appropriate for the range of errnos
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++ possible from fclonefileat(), so it's more consistent to avoid. */
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++ bool report_failure = is_terminal_error (errno);
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+
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+- if (reflink_mode == REFLINK_ALWAYS || transient_failure)
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++ if (reflink_mode == REFLINK_ALWAYS || report_failure)
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+ error (0, errno, _("failed to clone %s from %s"),
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+ quoteaf_n (0, dst_name), quoteaf_n (1, src_name));
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+
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+@@ -1190,14 +1198,14 @@ handle_clone_fail (int dst_dirfd, char c
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+ but cloned no data. */
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+ if (new_dst /* currently not for fclonefileat(). */
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+ && reflink_mode == REFLINK_ALWAYS
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+- && ((! transient_failure) || lseek (dest_desc, 0, SEEK_END) == 0)
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++ && ((! report_failure) || lseek (dest_desc, 0, SEEK_END) == 0)
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+ && unlinkat (dst_dirfd, dst_relname, 0) != 0 && errno != ENOENT)
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+ error (0, errno, _("cannot remove %s"), quoteaf (dst_name));
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+
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+- if (! transient_failure)
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++ if (! report_failure)
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+ copy_debug.reflink = COPY_DEBUG_UNSUPPORTED;
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+
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+- if (reflink_mode == REFLINK_ALWAYS || transient_failure)
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++ if (reflink_mode == REFLINK_ALWAYS || report_failure)
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+ return false;
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+
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+ return true;
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