xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

um: Add support for DISCARD in the UBD Driver

Browse Source 
Support for DISCARD and WRITE_ZEROES in the ubd driver using
fallocate.

DISCARD is enabled by default and can be disabled using a new
UBD command line flag.

If the underlying fs on which the UBD image is stored does not
support DISCARD the support for both DISCARD and WRITE_ZEROES
is turned off.

Signed-off-by: Anton Ivanov <anton.ivanov@cambridgegreys.com>
Signed-off-by: Richard Weinberger <richard@nod.at>
This commit is contained in:
Anton Ivanov
2018-11-14 18:41:09 +00:00
committed by Richard Weinberger
parent a41421edb9
commit 50109b5a03
3 changed files with 65 additions and 11 deletions
Download Patch File Download Diff File Expand all files Collapse all files

10
arch/um/os-Linux/file.c
View File

@@ -610,3 +610,13 @@ unsigned long long os_makedev(unsigned major, unsigned minor)
{
return makedev(major, minor);
}
int os_falloc_punch(int fd, unsigned long long offset, int len)
{
int n = fallocate(fd, FALLOC_FL_PUNCH_HOLE|FALLOC_FL_KEEP_SIZE, offset, len);
if (n < 0)
return -errno;
return n;
}