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Retain readahead of underlying device.

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(If libdevmapper version supports it).



git-svn-id: https://cryptsetup.googlecode.com/svn/trunk@54 36d66b0a-2a48-0410-832c-cd162a569da5
This commit is contained in:
Milan Broz
2009-06-20 20:22:27 +00:00
parent 8ce294ae3e
commit 9160fb0894
1 changed files with 27 additions and 0 deletions
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27
lib/libdevmapper.c
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@@ -6,10 +6,13 @@
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/sysmacros.h>
#include <sys/ioctl.h>
#include <unistd.h>
#include <dirent.h>
#include <errno.h>
#include <libdevmapper.h>
#include <fcntl.h>
#include <linux/fs.h>
#include "libcryptsetup.h"
#include "internal.h"
@@ -111,6 +114,23 @@ static char *lookup_dev(const char *dev)
return __lookup_dev(buf, makedev(major, minor));
}
static int _dev_read_ahead(const char *dev, uint32_t *read_ahead)
{
int fd, r = 0;
long read_ahead_long;
if ((fd = open(dev, O_RDONLY)) < 0)
return 0;
r = ioctl(fd, BLKRAGET, &read_ahead_long) ? 0 : 1;
close(fd);
if (r)
*read_ahead = (uint32_t) read_ahead_long;
return r;
}
static char *get_params(struct crypt_options *options, const char *key)
{
char *params;
@@ -235,6 +255,7 @@ static int dm_create_device(int reload, struct crypt_options *options,
char *params = NULL;
char *error = NULL;
int r = -EINVAL;
uint32_t read_ahead = 0;
params = get_params(options, key);
if (!params)
@@ -248,6 +269,12 @@ static int dm_create_device(int reload, struct crypt_options *options,
goto out;
if (!dm_task_add_target(dmt, 0, options->size, CRYPT_TARGET, params))
goto out;
#ifdef DM_READ_AHEAD_MINIMUM_FLAG
if (_dev_read_ahead(options->device, &read_ahead) &&
!dm_task_set_read_ahead(dmt, read_ahead, DM_READ_AHEAD_MINIMUM_FLAG))
goto out;
#endif
if (!dm_task_run(dmt))
goto out;