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authorAnton Ivanov <anton.ivanov@cambridgegreys.com>2018-11-14 18:41:09 +0000
committerRichard Weinberger <richard@nod.at>2018-12-27 22:48:20 +0100
commit50109b5a03b4024eb6b8df3ab8f427625f54fe92 (patch)
tree763dffe32e8a11bf9c6ac69bbf4a45cbc8e1ebff /arch/um/os-Linux
parenta41421edb926fcc8f212742b2e7a1f21c9047853 (diff)
um: Add support for DISCARD in the UBD Driver
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>
Diffstat (limited to 'arch/um/os-Linux')
-rw-r--r--arch/um/os-Linux/file.c10
1 files changed, 10 insertions, 0 deletions
diff --git a/arch/um/os-Linux/file.c b/arch/um/os-Linux/file.c
index c0197097c86e..f25b110d4e70 100644
--- a/arch/um/os-Linux/file.c
+++ b/arch/um/os-Linux/file.c
@@ -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;
+}
+