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um: Add support for DISCARD in the UBD Driver

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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
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arch/um/include/shared/os.h
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@@ -175,6 +175,7 @@ extern int os_fchange_dir(int fd);
extern unsigned os_major(unsigned long long dev);
extern unsigned os_minor(unsigned long long dev);
extern unsigned long long os_makedev(unsigned major, unsigned minor);
extern int os_falloc_punch(int fd, unsigned long long offset, int count);
/* start_up.c */
extern void os_early_checks(void);