fs,extension: Make truncate work on cached file content.

We now remember the path of each cached file, so when someone
truncates that path, we can truncate all open instances of it in
cache. Important when someone pipes to stomp a file / opens with
O_TRUNC (which FUSE disaggregates into an open() and then a truncate()
call). Gets rid of the need for FUSE_CAP_ATOMIC_O_TRUNC, which never
worked on macOS anyway.

Fixes #40.

1 files changed, 0 insertions, 16 deletions

diff --git a/fs/tabfs.c b/fs/tabfs.c
index a7936eb..c74becf 100644
--- a/fs/tabfs.c
+++ b/fs/tabfs.c
@@ -423,20 +423,6 @@ static int tabfs_mknod(const char *path, mode_t mode, dev_t rdev) {
     return 0;
 }
 
-#define want_capability(conn, flag) \
-    do { \
-        if (conn->capable & flag) { \
-            conn->want |= flag; \
-        } else { \
-            eprintln("warning: " #flag " not supported"); \
-        } \
-    } while (0)
-
-static void *tabfs_init(struct fuse_conn_info *conn) {
-    want_capability(conn, FUSE_CAP_ATOMIC_O_TRUNC);
-    return NULL;
-}
-
 static const struct fuse_operations tabfs_oper = {
     .getattr  = tabfs_getattr,
     .readlink = tabfs_readlink,
@@ -455,8 +441,6 @@ static const struct fuse_operations tabfs_oper = {
 
     .mkdir  = tabfs_mkdir,
     .mknod = tabfs_mknod,
-
-    .init = tabfs_init,
 };
 
 int main(int argc, char **argv) {