@@ -2907,11 +2907,13 @@ static long fuse_file_fallocate(struct file *file, int mode, loff_t offset,
};
int err;
bool lock_inode = !(mode & FALLOC_FL_KEEP_SIZE) ||
- (mode & FALLOC_FL_PUNCH_HOLE);
+ (mode & FALLOC_FL_PUNCH_HOLE) ||
+ (mode & FALLOC_FL_ZERO_RANGE);
bool block_faults = FUSE_IS_DAX(inode) && lock_inode;
- if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE))
+ if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE |
+ FALLOC_FL_ZERO_RANGE))
return -EOPNOTSUPP;
if (fm->fc->no_fallocate)
@@ -2926,7 +2928,8 @@ static long fuse_file_fallocate(struct file *file, int mode, loff_t offset,
goto out;
}
- if (mode & FALLOC_FL_PUNCH_HOLE) {
+ if ((mode & FALLOC_FL_PUNCH_HOLE) ||
+ (mode & FALLOC_FL_ZERO_RANGE)) {
loff_t endbyte = offset + length - 1;
err = fuse_writeback_range(inode, offset, endbyte);
libnbd's nbdfuse utility would like to translate fallocate zero requests into NBD_CMD_WRITE_ZEROES. Currently the fuse module filters these out, returning -EOPNOTSUPP. This commit treats these almost the same way as FALLOC_FL_PUNCH_HOLE except not calling truncate_pagecache_range. A way to test this is with the following script: -------------------- set -e set -x export output=$PWD/output rm -f test.img $output nbdkit sh - <<'EOF' case "$1" in get_size) echo 1M ;; can_write|can_trim|can_zero|can_fast_zero) ;; pread) echo "$@" >>$output; dd if=/dev/zero count=$3 iflag=count_bytes ;; pwrite) echo "$@" >>$output; cat >/dev/null ;; trim|zero) echo "$@" >>$output ;; *) exit 2 ;; esac EOF touch test.img nbdfuse --version nbdfuse test.img nbd://localhost & sleep 2 ls -lh test.img dd if=test.img of=/dev/null bs=512 skip=1024 count=1 dd if=/dev/zero of=test.img bs=512 skip=2048 count=1 fallocate -p -l 512 -o 4096 test.img fallocate -z -l 512 -o 8192 test.img cat $output fusermount3 -u test.img killall nbdkit rm test.img $output -------------------- which will print: pread 4096 524288 # number depends on readahea pwrite 512 0 trim 512 4096 zero 512 8192 may_trim with the last line indicating that the FALLOC_FL_ZERO_RANGE request was successfully passed through by the kernel module to nbdfuse, translated to NBD_CMD_WRITE_ZEROES and sent through to the server. Signed-off-by: Richard W.M. Jones <rjones@redhat.com> --- fs/fuse/file.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-)