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e2fsprogs/SOURCES/e2fsprogs-1.46.1-libext2fs-fix-un-ix_io-s-Direct-I-O-support.patch

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From c001596110e834a85b01a47a20811b318cb3b9e4 Mon Sep 17 00:00:00 2001
From: Theodore Ts'o <tytso@mit.edu>
Date: Fri, 26 Feb 2021 17:41:06 -0500
Subject: [PATCH] libext2fs: fix unix_io's Direct I/O support
The previous Direct I/O support worked on HDD's with 512 byte logical
sector sizes, and on FreeBSD which required 4k aligned memory buffers.
However, it was incomplete and was not correctly working on HDD's with
4k logical sector sizes (aka Advanced Format Disks).
Based on a patch from Alexey Lyashkov <alexey.lyashkov@hpe.com> but
rewritten to work with the latest e2fsprogs and to minimize changes to
make it easier to review.
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Reported-by: Artem Blagodarenko <artem.blagodarenko@gmail.com>
Signed-off-by: Pavel Reichl <preichl@redhat.com>
---
lib/ext2fs/io_manager.c | 6 ++-
lib/ext2fs/unix_io.c | 87 +++++++++++++++++++++++++++++++----------
2 files changed, 70 insertions(+), 23 deletions(-)
Index: e2fsprogs-1.45.6/lib/ext2fs/io_manager.c
===================================================================
--- e2fsprogs-1.45.6.orig/lib/ext2fs/io_manager.c
+++ e2fsprogs-1.45.6/lib/ext2fs/io_manager.c
@@ -134,9 +134,11 @@ errcode_t io_channel_alloc_buf(io_channe
else
size = -count;
- if (io->align)
+ if (io->align) {
+ if (io->align > size)
+ size = io->align;
return ext2fs_get_memalign(size, io->align, ptr);
- else
+ } else
return ext2fs_get_mem(size, ptr);
}
Index: e2fsprogs-1.45.6/lib/ext2fs/unix_io.c
===================================================================
--- e2fsprogs-1.45.6.orig/lib/ext2fs/unix_io.c
+++ e2fsprogs-1.45.6/lib/ext2fs/unix_io.c
@@ -165,13 +165,15 @@ static errcode_t raw_read_blk(io_channel
int actual = 0;
unsigned char *buf = bufv;
ssize_t really_read = 0;
+ unsigned long long aligned_blk;
+ int align_size, offset;
size = (count < 0) ? -count : (ext2_loff_t) count * channel->block_size;
data->io_stats.bytes_read += size;
location = ((ext2_loff_t) block * channel->block_size) + data->offset;
if (data->flags & IO_FLAG_FORCE_BOUNCE) {
- if (ext2fs_llseek(data->dev, location, SEEK_SET) != location) {
+ if (ext2fs_llseek(data->dev, location, SEEK_SET) < 0) {
retval = errno ? errno : EXT2_ET_LLSEEK_FAILED;
goto error_out;
}
@@ -182,6 +184,7 @@ static errcode_t raw_read_blk(io_channel
/* Try an aligned pread */
if ((channel->align == 0) ||
(IS_ALIGNED(buf, channel->align) &&
+ IS_ALIGNED(location, channel->align) &&
IS_ALIGNED(size, channel->align))) {
actual = pread64(data->dev, buf, size, location);
if (actual == size)
@@ -193,6 +196,7 @@ static errcode_t raw_read_blk(io_channel
if ((sizeof(off_t) >= sizeof(ext2_loff_t)) &&
((channel->align == 0) ||
(IS_ALIGNED(buf, channel->align) &&
+ IS_ALIGNED(location, channel->align) &&
IS_ALIGNED(size, channel->align)))) {
actual = pread(data->dev, buf, size, location);
if (actual == size)
@@ -201,12 +205,13 @@ static errcode_t raw_read_blk(io_channel
}
#endif /* HAVE_PREAD */
- if (ext2fs_llseek(data->dev, location, SEEK_SET) != location) {
+ if (ext2fs_llseek(data->dev, location, SEEK_SET) < 0) {
retval = errno ? errno : EXT2_ET_LLSEEK_FAILED;
goto error_out;
}
if ((channel->align == 0) ||
(IS_ALIGNED(buf, channel->align) &&
+ IS_ALIGNED(location, channel->align) &&
IS_ALIGNED(size, channel->align))) {
actual = read(data->dev, buf, size);
if (actual != size) {
@@ -231,21 +236,37 @@ static errcode_t raw_read_blk(io_channel
* to the O_DIRECT rules, so we need to do this the hard way...
*/
bounce_read:
+ if ((channel->block_size > channel->align) &&
+ (channel->block_size % channel->align) == 0)
+ align_size = channel->block_size;
+ else
+ align_size = channel->align;
+ aligned_blk = location / align_size;
+ offset = location % align_size;
+
+ if (ext2fs_llseek(data->dev, aligned_blk * align_size, SEEK_SET) < 0) {
+ retval = errno ? errno : EXT2_ET_LLSEEK_FAILED;
+ goto error_out;
+ }
while (size > 0) {
- actual = read(data->dev, data->bounce, channel->block_size);
- if (actual != channel->block_size) {
+ actual = read(data->dev, data->bounce, align_size);
+ if (actual != align_size) {
actual = really_read;
buf -= really_read;
size += really_read;
goto short_read;
}
- actual = size;
- if (size > channel->block_size)
- actual = channel->block_size;
- memcpy(buf, data->bounce, actual);
+ if ((actual + offset) > align_size)
+ actual = align_size - offset;
+ if (actual > size)
+ actual = size;
+ memcpy(buf, data->bounce + offset, actual);
+
really_read += actual;
size -= actual;
buf += actual;
+ offset = 0;
+ aligned_blk++;
}
return 0;
@@ -268,6 +289,8 @@ static errcode_t raw_write_blk(io_channe
int actual = 0;
errcode_t retval;
const unsigned char *buf = bufv;
+ unsigned long long aligned_blk;
+ int align_size, offset;
if (count == 1)
size = channel->block_size;
@@ -282,7 +305,7 @@ static errcode_t raw_write_blk(io_channe
location = ((ext2_loff_t) block * channel->block_size) + data->offset;
if (data->flags & IO_FLAG_FORCE_BOUNCE) {
- if (ext2fs_llseek(data->dev, location, SEEK_SET) != location) {
+ if (ext2fs_llseek(data->dev, location, SEEK_SET) < 0) {
retval = errno ? errno : EXT2_ET_LLSEEK_FAILED;
goto error_out;
}
@@ -293,6 +316,7 @@ static errcode_t raw_write_blk(io_channe
/* Try an aligned pwrite */
if ((channel->align == 0) ||
(IS_ALIGNED(buf, channel->align) &&
+ IS_ALIGNED(location, channel->align) &&
IS_ALIGNED(size, channel->align))) {
actual = pwrite64(data->dev, buf, size, location);
if (actual == size)
@@ -303,6 +327,7 @@ static errcode_t raw_write_blk(io_channe
if ((sizeof(off_t) >= sizeof(ext2_loff_t)) &&
((channel->align == 0) ||
(IS_ALIGNED(buf, channel->align) &&
+ IS_ALIGNED(location, channel->align) &&
IS_ALIGNED(size, channel->align)))) {
actual = pwrite(data->dev, buf, size, location);
if (actual == size)
@@ -310,13 +335,14 @@ static errcode_t raw_write_blk(io_channe
}
#endif /* HAVE_PWRITE */
- if (ext2fs_llseek(data->dev, location, SEEK_SET) != location) {
+ if (ext2fs_llseek(data->dev, location, SEEK_SET) < 0) {
retval = errno ? errno : EXT2_ET_LLSEEK_FAILED;
goto error_out;
}
if ((channel->align == 0) ||
(IS_ALIGNED(buf, channel->align) &&
+ IS_ALIGNED(location, channel->align) &&
IS_ALIGNED(size, channel->align))) {
actual = write(data->dev, buf, size);
if (actual < 0) {
@@ -340,37 +366,56 @@ static errcode_t raw_write_blk(io_channe
* to the O_DIRECT rules, so we need to do this the hard way...
*/
bounce_write:
+ if ((channel->block_size > channel->align) &&
+ (channel->block_size % channel->align) == 0)
+ align_size = channel->block_size;
+ else
+ align_size = channel->align;
+ aligned_blk = location / align_size;
+ offset = location % align_size;
+
while (size > 0) {
- if (size < channel->block_size) {
+ int actual_w;
+
+ if (size < align_size || offset) {
+ if (ext2fs_llseek(data->dev, aligned_blk * align_size,
+ SEEK_SET) < 0) {
+ retval = errno ? errno : EXT2_ET_LLSEEK_FAILED;
+ goto error_out;
+ }
actual = read(data->dev, data->bounce,
- channel->block_size);
- if (actual != channel->block_size) {
+ align_size);
+ if (actual != align_size) {
if (actual < 0) {
retval = errno;
goto error_out;
}
memset((char *) data->bounce + actual, 0,
- channel->block_size - actual);
+ align_size - actual);
}
}
actual = size;
- if (size > channel->block_size)
- actual = channel->block_size;
- memcpy(data->bounce, buf, actual);
- if (ext2fs_llseek(data->dev, location, SEEK_SET) != location) {
+ if ((actual + offset) > align_size)
+ actual = align_size - offset;
+ if (actual > size)
+ actual = size;
+ memcpy(((char *)data->bounce) + offset, buf, actual);
+ if (ext2fs_llseek(data->dev, aligned_blk * align_size, SEEK_SET) < 0) {
retval = errno ? errno : EXT2_ET_LLSEEK_FAILED;
goto error_out;
}
- actual = write(data->dev, data->bounce, channel->block_size);
- if (actual < 0) {
+ actual_w = write(data->dev, data->bounce, align_size);
+ if (actual_w < 0) {
retval = errno;
goto error_out;
}
- if (actual != channel->block_size)
+ if (actual_w != align_size)
goto short_write;
size -= actual;
buf += actual;
location += actual;
+ aligned_blk++;
+ offset = 0;
}
return 0;
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