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Date: Fri, 8 Feb 2013 12:07:02 +0100
From: Lukas Czerner <lczerner@...hat.com>
To: linux-ext4@...r.kernel.org
Cc: sandeen@...hat.com, tytso@....edu,
Lukas Czerner <lczerner@...hat.com>
Subject: [PATCH 2/3] e2fsprogs: Add write_byte64 into struct_io_manager
Current implementation of write_byte() is not able to cover 64bit
offsets. In order to preserve the ABI this commit introduces new
function into struct_io_manager called write_byte64 which is able to
accept 64bit offset.
All io managers are updated to implement write_byte64() and use it even
for write_byte().
Signed-off-by: Lukas Czerner <lczerner@...hat.com>
---
lib/ext2fs/ext2_io.h | 4 +++-
lib/ext2fs/inode_io.c | 18 +++++++++++++++---
lib/ext2fs/io_manager.c | 20 ++++++++++++++++++++
lib/ext2fs/test_io.c | 32 ++++++++++++++++++++++++++++++++
lib/ext2fs/unix_io.c | 17 ++++++++++++++---
5 files changed, 84 insertions(+), 7 deletions(-)
diff --git a/lib/ext2fs/ext2_io.h b/lib/ext2fs/ext2_io.h
index 1894fb8..e49119c 100644
--- a/lib/ext2fs/ext2_io.h
+++ b/lib/ext2fs/ext2_io.h
@@ -90,7 +90,9 @@ struct struct_io_manager {
int count, const void *data);
errcode_t (*discard)(io_channel channel, unsigned long long block,
unsigned long long count);
- long reserved[16];
+ errcode_t (*write_byte64)(io_channel channel, unsigned long long offset,
+ int count, const void *data);
+ long reserved[15];
};
#define IO_FLAG_RW 0x0001
diff --git a/lib/ext2fs/inode_io.c b/lib/ext2fs/inode_io.c
index 8e0944e..9a88c28 100644
--- a/lib/ext2fs/inode_io.c
+++ b/lib/ext2fs/inode_io.c
@@ -57,6 +57,9 @@ static errcode_t inode_write_blk(io_channel channel, unsigned long block,
static errcode_t inode_flush(io_channel channel);
static errcode_t inode_write_byte(io_channel channel, unsigned long offset,
int size, const void *data);
+static errcode_t inode_write_byte64(io_channel channel,
+ unsigned long long offset,
+ int size, const void *data);
static errcode_t inode_read_blk64(io_channel channel,
unsigned long long block, int count, void *data);
static errcode_t inode_write_blk64(io_channel channel,
@@ -75,7 +78,9 @@ static struct struct_io_manager struct_inode_manager = {
NULL,
NULL,
inode_read_blk64,
- inode_write_blk64
+ inode_write_blk64,
+ NULL,
+ inode_write_byte64,
};
io_manager inode_io_manager = &struct_inode_manager;
@@ -259,8 +264,9 @@ static errcode_t inode_write_blk(io_channel channel, unsigned long block,
return inode_write_blk64(channel, block, count, buf);
}
-static errcode_t inode_write_byte(io_channel channel, unsigned long offset,
- int size, const void *buf)
+static errcode_t inode_write_byte64(io_channel channel,
+ unsigned long long offset,
+ int size, const void *buf)
{
struct inode_private_data *data;
errcode_t retval = 0;
@@ -276,6 +282,12 @@ static errcode_t inode_write_byte(io_channel channel, unsigned long offset,
return ext2fs_file_write(data->file, buf, size, 0);
}
+static errcode_t inode_write_byte(io_channel channel, unsigned long offset,
+ int size, const void *buf)
+{
+ return inode_write_byte64(channel, offset, size, buf);
+}
+
/*
* Flush data buffers to disk.
*/
diff --git a/lib/ext2fs/io_manager.c b/lib/ext2fs/io_manager.c
index 34e4859..72f13d7 100644
--- a/lib/ext2fs/io_manager.c
+++ b/lib/ext2fs/io_manager.c
@@ -69,6 +69,26 @@ errcode_t io_channel_write_byte(io_channel channel, unsigned long offset,
return EXT2_ET_UNIMPLEMENTED;
}
+errcode_t io_channel_write_byte64(io_channel channel, unsigned long long offset,
+ int count, const void *data)
+{
+ EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);
+
+ if (channel->manager->write_byte64)
+ return channel->manager->write_byte64(channel, offset,
+ count, data);
+
+ if ((offset >> 32) != 0)
+ return EXT2_ET_IO_CHANNEL_NO_SUPPORT_64;
+
+ if (channel->manager->write_byte)
+ return channel->manager->write_byte(channel, offset,
+ count, data);
+
+ return EXT2_ET_UNIMPLEMENTED;
+}
+
+
errcode_t io_channel_read_blk64(io_channel channel, unsigned long long block,
int count, void *data)
{
diff --git a/lib/ext2fs/test_io.c b/lib/ext2fs/test_io.c
index 7d3cdfe..dc9f0c1 100644
--- a/lib/ext2fs/test_io.c
+++ b/lib/ext2fs/test_io.c
@@ -55,6 +55,8 @@ struct test_private_data {
void (*write_byte)(unsigned long block, int count, errcode_t err);
void (*read_blk64)(unsigned long long block, int count, errcode_t err);
void (*write_blk64)(unsigned long long block, int count, errcode_t err);
+ void (*write_byte64)(unsigned long long block, int count,
+ errcode_t err);
};
static errcode_t test_open(const char *name, int flags, io_channel *channel);
@@ -71,6 +73,9 @@ static errcode_t test_write_blk64(io_channel channel, unsigned long long block,
static errcode_t test_flush(io_channel channel);
static errcode_t test_write_byte(io_channel channel, unsigned long offset,
int count, const void *buf);
+static errcode_t test_write_byte64(io_channel channel,
+ unsigned long long offset,
+ int count, const void *buf);
static errcode_t test_set_option(io_channel channel, const char *option,
const char *arg);
static errcode_t test_get_stats(io_channel channel, io_stats *stats);
@@ -92,6 +97,7 @@ static struct struct_io_manager struct_test_manager = {
test_read_blk64,
test_write_blk64,
test_discard,
+ test_write_byte64,
};
io_manager test_io_manager = &struct_test_manager;
@@ -113,6 +119,8 @@ void (*test_io_cb_set_blksize)
(int blksize, errcode_t err) = 0;
void (*test_io_cb_write_byte)
(unsigned long block, int count, errcode_t err) = 0;
+void (*test_io_cb_write_byte64)
+ (unsigned long long block, int count, errcode_t err) = 0;
/*
* Test flags
@@ -222,6 +230,7 @@ static errcode_t test_open(const char *name, int flags, io_channel *channel)
data->write_blk = test_io_cb_write_blk;
data->set_blksize = test_io_cb_set_blksize;
data->write_byte = test_io_cb_write_byte;
+ data->write_byte64 = test_io_cb_write_byte64;
data->read_blk64 = test_io_cb_read_blk64;
data->write_blk64 = test_io_cb_write_blk64;
@@ -418,6 +427,29 @@ static errcode_t test_write_blk64(io_channel channel, unsigned long long block,
return retval;
}
+static errcode_t test_write_byte64(io_channel channel,
+ unsigned long long offset,
+ int count, const void *buf)
+{
+ struct test_private_data *data;
+ errcode_t retval = 0;
+
+ EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);
+ data = (struct test_private_data *) channel->private_data;
+ EXT2_CHECK_MAGIC(data, EXT2_ET_MAGIC_TEST_IO_CHANNEL);
+
+ if (data->real && data->real->manager->write_byte64)
+ retval = io_channel_write_byte64(data->real, offset,
+ count, buf);
+ if (data->write_byte64)
+ data->write_byte64(offset, count, retval);
+ if (data->flags & TEST_FLAG_WRITE)
+ fprintf(data->outfile,
+ "Test_io: write_byte64(%llu, %d) returned %s\n",
+ offset, count, retval ? error_message(retval) : "OK");
+ return retval;
+}
+
static errcode_t test_write_byte(io_channel channel, unsigned long offset,
int count, const void *buf)
{
diff --git a/lib/ext2fs/unix_io.c b/lib/ext2fs/unix_io.c
index 19be630..e67c682 100644
--- a/lib/ext2fs/unix_io.c
+++ b/lib/ext2fs/unix_io.c
@@ -107,6 +107,9 @@ static errcode_t unix_write_blk(io_channel channel, unsigned long block,
static errcode_t unix_flush(io_channel channel);
static errcode_t unix_write_byte(io_channel channel, unsigned long offset,
int size, const void *data);
+static errcode_t unix_write_byte64(io_channel channel,
+ unsigned long long offset,
+ int size, const void *data);
static errcode_t unix_set_option(io_channel channel, const char *option,
const char *arg);
static errcode_t unix_get_stats(io_channel channel, io_stats *stats)
@@ -135,6 +138,7 @@ static struct struct_io_manager struct_unix_manager = {
unix_read_blk64,
unix_write_blk64,
unix_discard,
+ unix_write_byte64,
};
io_manager unix_io_manager = &struct_unix_manager;
@@ -834,8 +838,9 @@ static errcode_t unix_write_blk(io_channel channel, unsigned long block,
return unix_write_blk64(channel, block, count, buf);
}
-static errcode_t unix_write_byte(io_channel channel, unsigned long offset,
- int size, const void *buf)
+static errcode_t unix_write_byte64(io_channel channel,
+ unsigned long long offset,
+ int size, const void *buf)
{
struct unix_private_data *data;
errcode_t retval = 0;
@@ -860,7 +865,7 @@ static errcode_t unix_write_byte(io_channel channel, unsigned long offset,
return retval;
#endif
- if (lseek(data->dev, offset + data->offset, SEEK_SET) < 0)
+ if (ext2fs_llseek(data->dev, offset + data->offset, SEEK_SET) < 0)
return errno;
actual = write(data->dev, buf, size);
@@ -870,6 +875,12 @@ static errcode_t unix_write_byte(io_channel channel, unsigned long offset,
return 0;
}
+static errcode_t unix_write_byte(io_channel channel, unsigned long offset,
+ int size, const void *buf)
+{
+ return unix_write_byte64(channel, offset, size, buf);
+}
+
/*
* Flush data buffers to disk.
*/
--
1.7.7.6
--
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