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btrfs-progs: replace start: add option -K/--nodiscard 

The commands initializing a new device (mkfs, device add) do discard by
default, while this is missing from replace start. For parity add the
options with same name and semantics.

Issue: #390
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
David Sterba 2021-09-27 19:57:03 +02:00
parent c50c448518
commit 2d50b98189
2 changed files with 14 additions and 3 deletions
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4
Documentation/btrfs-replace.asciidoc
View File

@ -55,6 +55,10 @@ never allowed to be used as the <targetdev>.
no background replace.
--enqueue::::
wait if there's another exclusive operation running, otherwise continue
-K|--nodiscard::::
Do not perform whole device TRIM operation on devices that are capable of that.
This does not affect discard/trim operation when the filesystem is mounted.
Please see the mount option 'discard' for that in `btrfs`(5).
*status* [-1] <mount_point>::
Print status and progress information of a running device replace operation.

13
cmds/replace.c
View File

@ -114,8 +114,9 @@ static const char *const cmd_replace_start_usage[] = {
" correct checksum. Devices which are currently mounted are",
" never allowed to be used as the <targetdev>",
"-B do not background",
"--enqueue wait if there's another exclusive operation running,",
" otherwise continue",
"--enqueue wait if there's another exclusive operation running,",
" otherwise continue",
"-K|--nodiscard do not perform whole device TRIM",
NULL
};
@ -141,6 +142,7 @@ static int cmd_replace_start(const struct cmd_struct *cmd,
u64 srcdev_size;
u64 dstdev_size;
bool enqueue = false;
bool discard = true;
optind = 0;
while (1) {
@ -148,16 +150,20 @@ static int cmd_replace_start(const struct cmd_struct *cmd,
enum { GETOPT_VAL_ENQUEUE = 256 };
static const struct option long_options[] = {
{ "enqueue", no_argument, NULL, GETOPT_VAL_ENQUEUE},
{ "nodiscard", no_argument, NULL, 'K' },
{ NULL, 0, NULL, 0}
};
c = getopt_long(argc, argv, "Brf", long_options, NULL);
c = getopt_long(argc, argv, "BKrf", long_options, NULL);
if (c < 0)
break;
switch (c) {
case 'B':
do_not_background = 1;
break;
case 'K':
discard = false;
break;
case 'r':
avoid_reading_from_srcdev = 1;
break;
@ -297,6 +303,7 @@ static int cmd_replace_start(const struct cmd_struct *cmd,
BTRFS_DEVICE_PATH_NAME_MAX);
ret = btrfs_prepare_device(fddstdev, dstdev, &dstdev_block_count, 0,
PREP_DEVICE_ZERO_END | PREP_DEVICE_VERBOSE |
(discard ? PREP_DEVICE_DISCARD : 0) |
(zoned ? PREP_DEVICE_ZONED : 0));
if (ret)
goto leave_with_error;