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| author | Ralph Boehme <slow@samba.org> | 2021-06-22 18:58:21 +0200 |
|---|---|---|
| committer | Jeremy Allison <jra@samba.org> | 2021-10-08 19:28:32 +0000 |
| commit | 2f523a03f5061feb68c614f39ae0061748c2d9b3 (patch) | |
| tree | d072321b72adb55d6a32a4353d1b77476c7ab8cf /lib/util/sys_rw.c | |
| parent | 8fa7848b4a002900e0c3384d2e0d41ea0fdf6ea9 (diff) | |
| download | samba-2f523a03f5061feb68c614f39ae0061748c2d9b3.tar.gz | |
lib: add sys_block_align[_truncate]()
This implements MS-FSA algorithms BlockAlign() and BlockAlignTruncate().
Signed-off-by: Ralph Boehme <slow@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
Diffstat (limited to 'lib/util/sys_rw.c')
| -rw-r--r-- | lib/util/sys_rw.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/lib/util/sys_rw.c b/lib/util/sys_rw.c index 02aaa871a39..d25a42b7082 100644 --- a/lib/util/sys_rw.c +++ b/lib/util/sys_rw.c @@ -23,6 +23,7 @@ #include "replace.h" #include "system/filesys.h" #include "lib/util/sys_rw.h" +#include <assert.h> bool sys_valid_io_range(off_t offset, size_t length) { @@ -73,6 +74,20 @@ bool sys_io_ranges_overlap(size_t c1, off_t o1, } } +off_t sys_block_align_truncate(off_t len, off_t align) +{ + assert(align > 1); + assert(((align - 1) & align) == 0); + return len & (~align + 1); +} + +off_t sys_block_align(off_t len, off_t align) +{ + assert(align > 1); + assert(((align - 1) & align) == 0); + return (len + (align - 1)) & ~(align - 1); +} + /******************************************************************* A read wrapper that will deal with EINTR/EWOULDBLOCK ********************************************************************/ |