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reencrypt: use fsync instead of O_DIRECT flag

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O_DIRECT operations directed towards filesystem are problematic:
There's no sane way how to detect specific filesystem requirements
for such operations.

This patch is replacing O_DIRECT flag with O_SYNC flag for all
open() calls related to reencrypt log. The O_SYNC flag is used
when --use-fsync option is detected.

Man page is modified accordingly.
This commit is contained in:
Ondrej Kozina
2014-09-17 16:38:39 +02:00
committed by Milan Broz
parent b8beedb621
commit 3d6bcae84c
2 changed files with 6 additions and 12 deletions
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6
man/cryptsetup-reencrypt.8
View File

@@ -158,13 +158,15 @@ WARNING: This is destructive operation and cannot be reverted.
.TP
.B "\-\-use-directio"
Use direct-io (O_DIRECT) for all read/write data operations.
Use direct-io (O_DIRECT) for all read/write data operations related
to block device undergoing reencryption.
Useful if direct-io operations perform better than normal buffered
operations (e.g. in virtual environments).
.TP
.B "\-\-use-fsync"
Use fsync call after every written block.
Use fsync call after every written block. This applies for reencryption
log files as well.
.TP
.B "\-\-write-log"
Update log file after every block write. This can slow down reencryption

12
src/cryptsetup_reencrypt.c
View File

@@ -76,7 +76,7 @@ struct reenc_ctx {
char crypt_path_org[PATH_MAX];
char crypt_path_new[PATH_MAX];
int log_fd;
char *log_buf;
char log_buf[SECTOR_SIZE];
struct {
char *password;
@@ -351,13 +351,11 @@ static void close_log(struct reenc_ctx *rc)
log_dbg("Closing LUKS reencryption log file %s.", rc->log_file);
if (rc->log_fd != -1)
close(rc->log_fd);
free(rc->log_buf);
rc->log_buf = NULL;
}
static int open_log(struct reenc_ctx *rc)
{
int flags = opt_directio ? O_DIRECT : 0;
int flags = opt_fsync ? O_SYNC : 0;
rc->log_fd = open(rc->log_file, O_RDWR|O_EXCL|O_CREAT|flags, S_IRUSR|S_IWUSR);
if (rc->log_fd != -1) {
@@ -371,12 +369,6 @@ static int open_log(struct reenc_ctx *rc)
if (rc->log_fd == -1)
return -EINVAL;
if (posix_memalign((void *)&rc->log_buf, alignment(rc->log_fd), SECTOR_SIZE)) {
log_err(_("Allocation of aligned memory failed.\n"));
close_log(rc);
return -ENOMEM;
}
if (!rc->in_progress && write_log(rc) < 0) {
close_log(rc);
return -EIO;