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Revert "Added error for writing to /dev/ on Linux"

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This reverts commit 860051f1d1.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Paul Dagnelie <pcd@delphix.com>
Reviewed-by: Rich Ercolani <rincebrain@gmail.com>
Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz>
Closes #13133
This commit is contained in:
наб 2022-02-20 14:41:10 +01:00 committed by Brian Behlendorf
parent 3a909fe33e
commit d1a5e9594c
1 changed files with 2 additions and 38 deletions
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40
cmd/zfs/zfs_main.c
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@ -728,34 +728,6 @@ finish_progress(char *done)
pt_header = NULL; pt_header = NULL;
} }
/* This function checks if the passed fd refers to /dev/null or /dev/zero */
#ifdef __linux__
static boolean_t
is_dev_nullzero(int fd)
{
struct stat st;
fstat(fd, &st);
return (major(st.st_rdev) == 1 && (minor(st.st_rdev) == 3 /* null */ ||
minor(st.st_rdev) == 5 /* zero */));
}
#endif
static void
note_dev_error(int err, int fd)
{
#ifdef __linux__
if (err == EINVAL && is_dev_nullzero(fd)) {
(void) fprintf(stderr,
gettext("Error: Writing directly to /dev/{null,zero} files"
" on certain kernels is not currently implemented.\n"
"(As a workaround, "
"try \"zfs send [...] | cat > /dev/null\")\n"));
}
#else
(void) err, (void) fd;
#endif
}
static int static int
zfs_mount_and_share(libzfs_handle_t *hdl, const char *dataset, zfs_type_t type) zfs_mount_and_share(libzfs_handle_t *hdl, const char *dataset, zfs_type_t type)
{ {
@ -4597,16 +4569,11 @@ zfs_do_send(int argc, char **argv)
err = zfs_send_saved(zhp, &flags, STDOUT_FILENO, err = zfs_send_saved(zhp, &flags, STDOUT_FILENO,
resume_token); resume_token);
if (err != 0)
note_dev_error(errno, STDOUT_FILENO);
zfs_close(zhp); zfs_close(zhp);
return (err != 0); return (err != 0);
} else if (resume_token != NULL) { } else if (resume_token != NULL) {
err = zfs_send_resume(g_zfs, &flags, STDOUT_FILENO, return (zfs_send_resume(g_zfs, &flags, STDOUT_FILENO,
resume_token); resume_token));
if (err != 0)
note_dev_error(errno, STDOUT_FILENO);
return (err);
} }
if (flags.skipmissing && !flags.replicate) { if (flags.skipmissing && !flags.replicate) {
@ -4657,8 +4624,6 @@ zfs_do_send(int argc, char **argv)
err = zfs_send_one(zhp, fromname, STDOUT_FILENO, &flags, err = zfs_send_one(zhp, fromname, STDOUT_FILENO, &flags,
redactbook); redactbook);
zfs_close(zhp); zfs_close(zhp);
if (err != 0)
note_dev_error(errno, STDOUT_FILENO);
return (err != 0); return (err != 0);
} }
@ -4735,7 +4700,6 @@ zfs_do_send(int argc, char **argv)
nvlist_free(dbgnv); nvlist_free(dbgnv);
} }
zfs_close(zhp); zfs_close(zhp);
note_dev_error(errno, STDOUT_FILENO);
return (err != 0); return (err != 0);
} }