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e2fsprogs
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mke2fs support for BLKDISCARD 

Try calling the BLKDISCARD ioctl at mkfs time to pre-discard all blocks
on an ssd, or a thinly-provisioned storage device.

No real error checking; if it fails, it fails, and that's ok - it's
just an optimization.  Also, it cannot work in conjunction with
the undo io manager, for obvious reasons.

Optionally disabled with a "-K" (mnemonic: Keep) option.

Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
bitmap-optimize
Eric Sandeen 2009-10-07 16:49:17 -05:00 committed by Theodore Ts'o
parent 5f91561ae7
commit 5827d2412d
2 changed files with 60 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
misc/mke2fs.8.in
View File

@ -45,6 +45,9 @@ mke2fs \- create an ext2/ext3/ext4 filesystem
.I journal-options
]
[
.B \-K
]
[
.B \-N
.I number-of-inodes
]
@ -366,6 +369,10 @@ and may be no more than 102,400 filesystem blocks.
@JDEV@.BR size " or " device
@JDEV@options can be given for a filesystem.
.TP
.BI \-K
Keep, do not attempt to discard blocks at mkfs time (discarding blocks initially
is useful on solid state devices and sparse / thin-provisioned storage).
.TP
.BI \-l " filename"
Read the bad blocks list from
.IR filename .

55
misc/mke2fs.c
View File

@ -79,6 +79,7 @@ int cflag;
int verbose;
int quiet;
int super_only;
int discard = 1;
int force;
int noaction;
int journal_size;
@ -111,7 +112,7 @@ static void usage(void)
"\t[-g blocks-per-group] [-L volume-label] "
"[-M last-mounted-directory]\n\t[-O feature[,...]] "
"[-r fs-revision] [-E extended-option[,...]]\n"
"\t[-T fs-type] [-U UUID] [-jnqvFSV] device [blocks-count]\n"),
"\t[-T fs-type] [-U UUID] [-jnqvFKSV] device [blocks-count]\n"),
program_name);
exit(1);
}
@ -1206,7 +1207,7 @@ static void PRS(int argc, char *argv[])
}
while ((c = getopt (argc, argv,
"b:cf:g:G:i:jl:m:no:qr:s:t:vE:FI:J:L:M:N:O:R:ST:U:V")) != EOF) {
"b:cf:g:G:i:jl:m:no:qr:s:t:vE:FI:J:KL:M:N:O:R:ST:U:V")) != EOF) {
switch (c) {
case 'b':
blocksize = strtol(optarg, &tmp, 0);
@ -1285,6 +1286,9 @@ static void PRS(int argc, char *argv[])
case 'J':
parse_journal_opts(optarg);
break;
case 'K':
discard = 0;
break;
case 'j':
if (!journal_size)
journal_size = -1;
@ -1906,6 +1910,48 @@ static int mke2fs_setup_tdb(const char *name, io_manager *io_ptr)
return retval;
}
#ifdef __linux__
#ifndef BLKDISCARD
#define BLKDISCARD _IO(0x12,119)
#endif
static void mke2fs_discard_blocks(ext2_filsys fs)
{
int fd;
int ret;
int blocksize;
__u64 blocks;
__uint64_t range[2];
blocks = ext2fs_blocks_count(fs->super);
blocksize = EXT2_BLOCK_SIZE(fs->super);
range[0] = 0;
range[1] = blocks * blocksize;
fd = open64(fs->device_name, O_RDONLY);
/*
* We don't care about whether the ioctl succeeds; it's only an
* optmization for SSDs or sparse storage.
*/
if (fd > 0) {
ret = ioctl(fd, BLKDISCARD, &range);
if (verbose) {
printf(_("Calling BLKDISCARD from %llu to %llu "),
range[0], range[1]);
if (ret)
printf(_("failed.\n"));
else
printf(_("succeeded.\n"));
}
close(fd);
}
}
#else
#define mke2fs_discard_blocks(fs)
#endif
int main (int argc, char *argv[])
{
errcode_t retval = 0;
@ -1949,6 +1995,11 @@ int main (int argc, char *argv[])
com_err(device_name, retval, _("while setting up superblock"));
exit(1);
}
/* Can't undo discard ... */
if (discard && (io_ptr != undo_io_manager))
mke2fs_discard_blocks(fs);
sprintf(tdb_string, "tdb_data_size=%d", fs->blocksize <= 4096 ?
32768 : fs->blocksize * 8);
io_channel_set_options(fs->io, tdb_string);