diff options
Diffstat (limited to 'lib/ext2fs/getsectsize.c')
| -rw-r--r-- | lib/ext2fs/getsectsize.c | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/lib/ext2fs/getsectsize.c b/lib/ext2fs/getsectsize.c index 30faecc7..9c3f4a2e 100644 --- a/lib/ext2fs/getsectsize.c +++ b/lib/ext2fs/getsectsize.c @@ -62,6 +62,32 @@ errcode_t ext2fs_get_device_sectsize(const char *file, int *sectsize) } /* + * Return desired alignment for direct I/O + */ +int ext2fs_get_dio_alignment(int fd) +{ + int align = 0; + +#ifdef BLKSSZGET + if (ioctl(fd, BLKSSZGET, &align) < 0) + align = 0; +#endif + +#ifdef _SC_PAGESIZE + if (align <= 0) + align = sysconf(_SC_PAGESIZE); +#endif +#ifdef HAVE_GETPAGESIZE + if (align <= 0) + align = getpagesize(); +#endif + if (align <= 0) + align = 4096; + + return align; +} + +/* * Returns the physical sector size of a device */ errcode_t ext2fs_get_device_phys_sectsize(const char *file, int *sectsize) |