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Use ioctl(F2FS_IOC_GET_FEATURES) to determine whether or not atomic batch

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writes are available.

FossilOrigin-Name: 532bbf1f2b1028db4e581c756533aa660e482d833caaed4eafb299ef9b584f3a
This commit is contained in:
dan
2017-07-21 21:06:24 +00:00
parent 172861be76
commit 9d70954094
3 changed files with 15 additions and 12 deletions
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11
src/os_unix.c
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@@ -332,6 +332,9 @@ static pid_t randomnessPid = 0;
#define F2FS_IOC_COMMIT_ATOMIC_WRITE _IO(F2FS_IOCTL_MAGIC, 2)
#define F2FS_IOC_START_VOLATILE_WRITE _IO(F2FS_IOCTL_MAGIC, 3)
#define F2FS_IOC_ABORT_VOLATILE_WRITE _IO(F2FS_IOCTL_MAGIC, 5)
#define F2FS_IOC_GET_FEATURES _IOR(F2FS_IOCTL_MAGIC, 12, u32)
#define F2FS_FEATURE_ATOMIC_WRITE 0x0004
/*
@@ -507,7 +510,7 @@ static struct unix_syscall {
#define osLstat ((int(*)(const char*,struct stat*))aSyscall[27].pCurrent)
{ "ioctl", (sqlite3_syscall_ptr)ioctl, 0 },
#define osIoctl ((int(*)(int,int))aSyscall[28].pCurrent)
#define osIoctl ((int(*)(int,int,...))aSyscall[28].pCurrent)
}; /* End of the overrideable system calls */
@@ -3894,12 +3897,12 @@ static int unixFileControl(sqlite3_file *id, int op, void *pArg){
static void setDeviceCharacteristics(unixFile *pFd){
if( pFd->sectorSize==0 ){
int res;
u32 f = 0;
assert( pFd->deviceCharacteristics==0 );
/* Check for support for F2FS atomic batch writes. */
res = osIoctl(pFd->h, F2FS_IOC_START_VOLATILE_WRITE);
if( res==SQLITE_OK ){
osIoctl(pFd->h, F2FS_IOC_ABORT_VOLATILE_WRITE);
res = osIoctl(pFd->h, F2FS_IOC_GET_FEATURES, &f);
if( res==0 && (f & F2FS_FEATURE_ATOMIC_WRITE) ){
pFd->deviceCharacteristics =
SQLITE_IOCAP_BATCH_ATOMIC |
SQLITE_IOCAP_ATOMIC |