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authorFrédéric Danis <frederic.danis@collabora.com>2022-01-25 20:14:05 +0300
committerRichard Weinberger <richard@nod.at>2022-03-11 12:46:34 +0300
commitd2a0a616ab2246aab9527eeacf86a033679c8b22 (patch)
treef20757bf5efbfacc01c905f417b35fadc9eaf9fe /arch/um/os-Linux
parentb35507a4cfb26b7fcc0c97de6367828d5902bbba (diff)
downloadlinux-d2a0a616ab2246aab9527eeacf86a033679c8b22.tar.xz
um: Fix WRITE_ZEROES in the UBD Driver
Call to fallocate with FALLOC_FL_PUNCH_HOLE on a device backed by a sparse file can end up by missing data, zeroes data range, if the underlying file is used with a tool like bmaptool which will referenced only used spaces. Signed-off-by: Frédéric Danis <frederic.danis@collabora.com> Acked-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.c9
1 files changed, 9 insertions, 0 deletions
diff --git a/arch/um/os-Linux/file.c b/arch/um/os-Linux/file.c
index e4421dbc4c36..fc4450db59bd 100644
--- a/arch/um/os-Linux/file.c
+++ b/arch/um/os-Linux/file.c
@@ -625,6 +625,15 @@ int os_falloc_punch(int fd, unsigned long long offset, int len)
return n;
}
+int os_falloc_zeroes(int fd, unsigned long long offset, int len)
+{
+ int n = fallocate(fd, FALLOC_FL_ZERO_RANGE|FALLOC_FL_KEEP_SIZE, offset, len);
+
+ if (n < 0)
+ return -errno;
+ return n;
+}
+
int os_eventfd(unsigned int initval, int flags)
{
int fd = eventfd(initval, flags);