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Improve ntfs_device_size_get for file 

For avoid random read we can use IO callback for get stat.
pull/45/head
Konstantin Germanov 2022-06-29 10:33:26 -04:00
parent 875a1d4e90
commit 1f896b10e6
1 changed files with 13 additions and 0 deletions
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13
libntfs-3g/device.c
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@ -529,6 +529,7 @@ static int ntfs_device_offset_valid(struct ntfs_device *dev, s64 ofs)
s64 ntfs_device_size_get(struct ntfs_device *dev, int block_size)
{
s64 high, low;
struct stat sbuf;
if (!dev || block_size <= 0 || (block_size - 1) & block_size) {
errno = EINVAL;
@ -596,6 +597,18 @@ s64 ntfs_device_size_get(struct ntfs_device *dev, int block_size)
}
}
#endif
/*
* We couldn't figure it out by using a specialized ioctl,
* so do lstat on device.
*/
if (dev->d_ops->stat(dev, &sbuf) == 0) {
ntfs_log_debug("STAT nr bytes = %llu (0x%llx)\n",
(unsigned long long)sbuf.st_size,
(unsigned long long)sbuf.st_size);
return sbuf.st_size / block_size;
}
/*
* We couldn't figure it out by using a specialized ioctl,
* so do binary search to find the size of the device.