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e2fsprogs: Use punch hole as "discard" on regular files

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If e2fsprogs tools (mke2fs, e2fsck) is run on regular file instead of
on block device, we can use punch hole instead of regular discard
command which would not work on regular file anyway. This gives us
several advantages. First of all when e2fsck is run with '-E discard'
parameter it will punch out all ununsed space from the image, hence
trimming down the file system image. And secondly, when creating an
file system on regular file (with '-E discard' which is default), we
can use punch hole to clear the file content, hence we can skip inode
table initialization, because reads from sparse area returns zeros. This
will result in faster file system creation (without the need to specify
lazy_itable_init) and smaller images.

This commit also fixes some tests that would fail due to mke2fs showing
discard progress, hence the output would differ.

Signed-off-by: Lukas Czerner <lczerner@redhat.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
This commit is contained in:
Lukas Czerner 2011-09-15 23:44:59 -04:00 committed by Theodore Ts'o
parent c859cb1de0
commit d2bfdc7ff1
8 changed files with 60 additions and 15 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
configure vendored
View File

@ -10314,7 +10314,7 @@ fi
done
fi
for ac_header in dirent.h errno.h execinfo.h getopt.h malloc.h mntent.h paths.h semaphore.h setjmp.h signal.h stdarg.h stdint.h stdlib.h termios.h termio.h unistd.h utime.h linux/fd.h linux/major.h net/if_dl.h netinet/in.h sys/disklabel.h sys/file.h sys/ioctl.h sys/mkdev.h sys/mman.h sys/prctl.h sys/queue.h sys/resource.h sys/select.h sys/socket.h sys/sockio.h sys/stat.h sys/syscall.h sys/sysmacros.h sys/time.h sys/types.h sys/un.h sys/wait.h
for ac_header in dirent.h errno.h execinfo.h getopt.h malloc.h mntent.h paths.h semaphore.h setjmp.h signal.h stdarg.h stdint.h stdlib.h termios.h termio.h unistd.h utime.h linux/falloc.h linux/fd.h linux/major.h net/if_dl.h netinet/in.h sys/disklabel.h sys/file.h sys/ioctl.h sys/mkdev.h sys/mman.h sys/prctl.h sys/queue.h sys/resource.h sys/select.h sys/socket.h sys/sockio.h sys/stat.h sys/syscall.h sys/sysmacros.h sys/time.h sys/types.h sys/un.h sys/wait.h
do :
as_ac_Header=`$as_echo "ac_cv_header_$ac_header" | $as_tr_sh`
ac_fn_c_check_header_mongrel "$LINENO" "$ac_header" "$as_ac_Header" "$ac_includes_default"

2
configure.in
View File

@ -802,7 +802,7 @@ if test $cross_compiling = no; then
else
AC_CHECK_PROGS(BUILD_CC, gcc cc)
fi
AC_CHECK_HEADERS(dirent.h errno.h execinfo.h getopt.h malloc.h mntent.h paths.h semaphore.h setjmp.h signal.h stdarg.h stdint.h stdlib.h termios.h termio.h unistd.h utime.h linux/fd.h linux/major.h net/if_dl.h netinet/in.h sys/disklabel.h sys/file.h sys/ioctl.h sys/mkdev.h sys/mman.h sys/prctl.h sys/queue.h sys/resource.h sys/select.h sys/socket.h sys/sockio.h sys/stat.h sys/syscall.h sys/sysmacros.h sys/time.h sys/types.h sys/un.h sys/wait.h)
AC_CHECK_HEADERS(dirent.h errno.h execinfo.h getopt.h malloc.h mntent.h paths.h semaphore.h setjmp.h signal.h stdarg.h stdint.h stdlib.h termios.h termio.h unistd.h utime.h linux/falloc.h linux/fd.h linux/major.h net/if_dl.h netinet/in.h sys/disklabel.h sys/file.h sys/ioctl.h sys/mkdev.h sys/mman.h sys/prctl.h sys/queue.h sys/resource.h sys/select.h sys/socket.h sys/sockio.h sys/stat.h sys/syscall.h sys/sysmacros.h sys/time.h sys/types.h sys/un.h sys/wait.h)
AC_CHECK_HEADERS(sys/disk.h sys/mount.h,,,
[[
#if HAVE_SYS_QUEUE_H

1
lib/ext2fs/ext2_io.h
View File

@ -30,6 +30,7 @@ typedef struct struct_io_stats *io_stats;
#define CHANNEL_FLAGS_WRITETHROUGH 0x01
#define CHANNEL_FLAGS_DISCARD_ZEROES 0x02
#define CHANNEL_FLAGS_BLOCK_DEVICE 0x04
#define io_channel_discard_zeroes_data(i) (i->flags & CHANNEL_FLAGS_DISCARD_ZEROES)

55
lib/ext2fs/unix_io.c
View File

@ -49,6 +49,9 @@
#if HAVE_SYS_RESOURCE_H
#include <sys/resource.h>
#endif
#if HAVE_LINUX_FALLOC_H
#include <linux/falloc.h>
#endif
#if defined(__linux__) && defined(_IO) && !defined(BLKROGET)
#define BLKROGET _IO(0x12, 94) /* Get read-only status (0 = read_write). */
@ -488,6 +491,20 @@ static errcode_t unix_open(const char *name, int flags, io_channel *channel)
goto cleanup;
}
/*
* If the device is really a block device, then set the
* appropriate flag, otherwise we can set DISCARD_ZEROES flag
* because we are going to use punch hole instead of discard
* and if it succeed, subsequent read from sparse area returns
* zero.
*/
if (ext2fs_stat(io->name, &st) == 0) {
if (S_ISBLK(st.st_mode))
io->flags |= CHANNEL_FLAGS_BLOCK_DEVICE;
else
io->flags |= CHANNEL_FLAGS_DISCARD_ZEROES;
}
#ifdef BLKSSZGET
if (flags & IO_FLAG_DIRECT_IO) {
if (ioctl(data->dev, BLKSSZGET, &data->align) != 0)
@ -853,13 +870,12 @@ static errcode_t unix_set_option(io_channel channel, const char *option,
}
#if defined(__linux__) && !defined(BLKDISCARD)
#define BLKDISCARD _IO(0x12,119)
#define BLKDISCARD _IO(0x12,119)
#endif
static errcode_t unix_discard(io_channel channel, unsigned long long block,
unsigned long long count)
{
#ifdef BLKDISCARD
struct unix_private_data *data;
__uint64_t range[2];
int ret;
@ -868,14 +884,35 @@ static errcode_t unix_discard(io_channel channel, unsigned long long block,
data = (struct unix_private_data *) channel->private_data;
EXT2_CHECK_MAGIC(data, EXT2_ET_MAGIC_UNIX_IO_CHANNEL);
range[0] = (__uint64_t)(block) * channel->block_size;
range[1] = (__uint64_t)(count) * channel->block_size;
if (channel->flags & CHANNEL_FLAGS_BLOCK_DEVICE) {
#ifdef BLKDISCARD
range[0] = (__uint64_t)(block) * channel->block_size;
range[1] = (__uint64_t)(count) * channel->block_size;
ret = ioctl(data->dev, BLKDISCARD, &range);
if (ret < 0)
return errno;
return 0;
ret = ioctl(data->dev, BLKDISCARD, &range);
#else
return EXT2_ET_UNIMPLEMENTED;
goto unimplemented;
#endif
} else {
#ifdef FALLOC_FL_PUNCH_HOLE
/*
* If we are not on block device, try to use punch hole
* to reclaim free space.
*/
ret = fallocate(data->dev,
FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE,
(off_t)(block) * channel->block_size,
(off_t)(count) * channel->block_size);
#else
goto unimplemented;
#endif
}
if (ret < 0) {
if (errno == EOPNOTSUPP)
goto unimplemented;
return errno;
}
return 0;
unimplemented:
return EXT2_ET_UNIMPLEMENTED;
}

10
misc/mke2fs.c
View File

@ -2077,12 +2077,18 @@ static int mke2fs_discard_device(ext2_filsys fs)
struct ext2fs_numeric_progress_struct progress;
blk64_t blocks = ext2fs_blocks_count(fs->super);
blk64_t count = DISCARD_STEP_MB;
blk64_t cur = 0;
blk64_t cur;
int retval = 0;
retval = io_channel_discard(fs->io, 0, 0);
/*
* Let's try if discard really works on the device, so
* we do not print numeric progress resulting in failure
* afterwards.
*/
retval = io_channel_discard(fs->io, 0, fs->blocksize);
if (retval)
return retval;
cur = fs->blocksize;
count *= (1024 * 1024);
count /= fs->blocksize;

1
tests/f_resize_inode/script
View File

@ -17,6 +17,7 @@ dd if=/dev/zero of=$TMPFILE bs=1k count=512 > /dev/null 2>&1
echo mke2fs -F -O resize_inode -o Linux -b 1024 -g 1024 test.img 16384 > $OUT
$MKE2FS -F -O resize_inode -o Linux -b 1024 -g 1024 $TMPFILE 16384 2>&1 \
| sed -e '1d' | grep -v "automatically checked" |
grep -v 'Discarding device blocks' |
grep -v "whichever comes first" >> $OUT
$FSCK $FSCK_OPT -N test_filesys $TMPFILE > $OUT.new 2>&1

2
tests/m_bigjournal/script
View File

@ -1,4 +1,4 @@
DESCRIPTION="journal over 4GB in size"
FS_SIZE=11000000
MKE2FS_OPTS="-t ext4 -G 512 -N 1280 -J size=5000 -q -E lazy_journal_init,lazy_itable_init"
MKE2FS_OPTS="-t ext4 -G 512 -N 1280 -J size=5000 -q -E lazy_journal_init,lazy_itable_init,nodiscard"
. $cmd_dir/run_mke2fs

2
tests/run_mke2fs
View File

@ -11,7 +11,7 @@ MKE2FS_SKIP_PROGRESS=true
MKE2FS_SKIP_CHECK_MSG=true
export MKE2FS_SKIP_PROGRESS MKE2FS_SKIP_CHECK_MSG
> $TMPFILE
PREP_CMD='$MKE2FS -F -o Linux $MKE2FS_OPTS $TMPFILE $FS_SIZE 2>&1 | sed -e 1d | tr -d \\015 > $OUT1 ; $DEBUGFS -R features $TMPFILE 2>&1 | sed -e 1d | tr -d \\015 >> $OUT1 ; echo " " >> $OUT1'
PREP_CMD='$MKE2FS -F -o Linux $MKE2FS_OPTS $TMPFILE $FS_SIZE 2>&1 | sed -e 1d | grep -v "Discarding device blocks" | tr -d \\015 > $OUT1 ; $DEBUGFS -R features $TMPFILE 2>&1 | sed -e 1d | tr -d \\015 >> $OUT1 ; echo " " >> $OUT1'
AFTER_CMD='$DUMPE2FS $TMPFILE 2>&1 | sed -f $cmd_dir/filter_dumpe2fs | tr -d \\015 >> $OUT1'
. $cmd_dir/run_e2fsck