s3:vfs_gpfs: Implement fallocate callback for GPFS

GPFS provides the gpfs_prealloc call. Implement the fallocate
callback with mode VFS_FALLOCATE_EXTEND_SIZE using this call.
There is no support for VFS_FALLOCATE_KEEP_SIZE, so report
this mode as not available.

1 files changed, 12 insertions, 0 deletions

diff --git a/source3/modules/gpfs.c b/source3/modules/gpfs.c
index f17c6bb252..2cbf0b501a 100644
--- a/source3/modules/gpfs.c
+++ b/source3/modules/gpfs.c
@@ -35,6 +35,7 @@ static int (*gpfs_get_realfilename_path_fn)(char *pathname, char *filenamep,
 static int (*gpfs_set_winattrs_path_fn)(char *pathname, int flags, struct gpfs_winattr *attrs);
 static int (*gpfs_get_winattrs_path_fn)(char *pathname, struct gpfs_winattr *attrs);
 static int (*gpfs_get_winattrs_fn)(int fd, struct gpfs_winattr *attrs);
+static int (*gpfs_prealloc_fn)(int fd, gpfs_off64_t startOffset, gpfs_off64_t bytesToPrealloc);
 static int (*gpfs_ftruncate_fn)(int fd, gpfs_off64_t length);
 static int (*gpfs_lib_init_fn)(int flags);
 static int (*gpfs_quotactl_fn)(char *pathname, int cmd, int id, void *bufferP);
@@ -177,6 +178,16 @@ int smbd_fget_gpfs_winattrs(int fd, struct gpfs_winattr *attrs)
         return gpfs_get_winattrs_fn(fd, attrs);
 }
 
+int smbd_gpfs_prealloc(int fd, gpfs_off64_t start, gpfs_off64_t bytes)
+{
+	if (gpfs_prealloc_fn == NULL) {
+		errno = ENOSYS;
+		return -1;
+	}
+
+	return gpfs_prealloc_fn(fd, start, bytes);
+}
+
 int set_gpfs_winattrs(char *pathname,int flags,struct gpfs_winattr *attrs)
 {
 	if (gpfs_set_winattrs_path_fn == NULL) {
@@ -329,6 +340,7 @@ void init_gpfs(void)
 	init_gpfs_function(&gpfs_get_winattrs_path_fn,"gpfs_get_winattrs_path");
         init_gpfs_function(&gpfs_set_winattrs_path_fn,"gpfs_set_winattrs_path");
         init_gpfs_function(&gpfs_get_winattrs_fn,"gpfs_get_winattrs");
+	init_gpfs_function(&gpfs_prealloc_fn, "gpfs_prealloc");
 	init_gpfs_function(&gpfs_ftruncate_fn, "gpfs_ftruncate");
         init_gpfs_function(&gpfs_lib_init_fn,"gpfs_lib_init");
 	init_gpfs_function(&gpfs_quotactl_fn, "gpfs_quotactl");