Rename vfs operation posix_fallocate to just fallocate and add the vfs_fallocate_mode parameter.

It turns out we need the fallocate operations to be able to both
allocate and extend filesize, and to allocate and not extend
filesize, and posix_fallocate can only do the former. So by defining
the vfs op as posix_fallocate we lose the opportunity to use any
underlying syscalls (like Linux fallocate) that can do the latter
as well.

We don't currently use the non-extending filesize call, but now
I've changed the vfs op definition we can in the future. For the
moment simply map the fallocate op onto posix_fallocate for the
VFS_FALLOCATE_EXTEND_SIZE case and return ENOSYS for the
VFS_FALLOCATE_KEEP_SIZE case.

Jeremy.

Autobuild-User: Jeremy Allison <jra@samba.org>
Autobuild-Date: Sat Dec 18 08:59:27 CET 2010 on sn-devel-104

11 files changed, 72 insertions, 47 deletions

diff --git a/examples/VFS/skel_opaque.c b/examples/VFS/skel_opaque.c
index 40ee5e9d6e..e506a2060d 100644
--- a/examples/VFS/skel_opaque.c
+++ b/examples/VFS/skel_opaque.c
@@ -308,7 +308,8 @@ static int skel_ftruncate(vfs_handle_struct *handle, files_struct *fsp, SMB_OFF_
 	return -1;
 }
 
-static int skel_posix_fallocate(vfs_handle_struct *handle, files_struct *fsp,
+static int skel_fallocate(vfs_handle_struct *handle, files_struct *fsp,
+			enum vfs_fallocate_mode mode,
 			SMB_OFF_T offset, SMB_OFF_T len)
 {
 	errno = ENOSYS;
@@ -820,7 +821,7 @@ struct vfs_fn_pointers skel_transparent_fns = {
 	.getwd = skel_getwd,
 	.ntimes = skel_ntimes,
 	.ftruncate = skel_ftruncate,
-	.posix_fallocate = skel_posix_fallocate,
+	.fallocate = skel_fallocate,
 	.lock = skel_lock,
 	.kernel_flock = skel_kernel_flock,
 	.linux_setlease = skel_linux_setlease,
diff --git a/examples/VFS/skel_transparent.c b/examples/VFS/skel_transparent.c
index ca22a30564..3ab3b63eaf 100644
--- a/examples/VFS/skel_transparent.c
+++ b/examples/VFS/skel_transparent.c
@@ -292,11 +292,12 @@ static int skel_ftruncate(vfs_handle_struct *handle, files_struct *fsp, SMB_OFF_
 	return SMB_VFS_NEXT_FTRUNCATE(handle, fsp, offset);
 }
 
-static int skel_posix_fallocate(vfs_handle_struct *handle, files_struct *fsp,
+static int skel_fallocate(vfs_handle_struct *handle, files_struct *fsp,
+			enum vfs_fallocate_mode,
 			SMB_OFF_T offset,
 			SMB_OFF_T len)
 {
-	return SMB_VFS_NEXT_POSIX_FALLOCATE(handle, fsp, offset, len);
+	return SMB_VFS_NEXT_FALLOCATE(handle, fsp, mode, offset, len);
 }
 
 static bool skel_lock(vfs_handle_struct *handle, files_struct *fsp, int op, SMB_OFF_T offset, SMB_OFF_T count, int type)
@@ -764,7 +765,7 @@ struct vfs_fn_pointers skel_transparent_fns = {
 	.getwd = skel_getwd,
 	.ntimes = skel_ntimes,
 	.ftruncate = skel_ftruncate,
-	.posix_fallocate = skel_posix_fallocate,
+	.fallocate = skel_fallocate,
 	.lock = skel_lock,
 	.kernel_flock = skel_kernel_flock,
 	.linux_setlease = skel_linux_setlease,
diff --git a/source3/include/smbprofile.h b/source3/include/smbprofile.h
index 647bf17e64..ff8ab90ce1 100644
--- a/source3/include/smbprofile.h
+++ b/source3/include/smbprofile.h
@@ -179,9 +179,9 @@ enum profile_stats_values
 #define syscall_ftruncate_count __profile_stats_value(PR_VALUE_SYSCALL_FTRUNCATE, count)
 #define syscall_ftruncate_time __profile_stats_value(PR_VALUE_SYSCALL_FTRUNCATE, time)
 
-	PR_VALUE_SYSCALL_POSIX_FALLOCATE,
-#define syscall_posix_fallocate_count __profile_stats_value(PR_VALUE_SYSCALL_POSIX_FALLOCATE, count)
-#define syscall_posix_fallocate_time __profile_stats_value(PR_VALUE_SYSCALL_POSIX_FALLOCATE, time)
+	PR_VALUE_SYSCALL_FALLOCATE,
+#define syscall_fallocate_count __profile_stats_value(PR_VALUE_SYSCALL_FALLOCATE, count)
+#define syscall_fallocate_time __profile_stats_value(PR_VALUE_SYSCALL_FALLOCATE, time)
 
 	PR_VALUE_SYSCALL_FCNTL_LOCK,
 #define syscall_fcntl_lock_count __profile_stats_value(PR_VALUE_SYSCALL_FCNTL_LOCK, count)
diff --git a/source3/include/vfs.h b/source3/include/vfs.h
index cb49a17ce2..72d61e330f 100644
--- a/source3/include/vfs.h
+++ b/source3/include/vfs.h
@@ -130,6 +130,8 @@
 		 malloc'ed path. JRA. */
 /* Leave at 28 - not yet released. Move posix_fallocate into the VFS
 		where it belongs. JRA. */
+/* Leave at 28 - not yet released. Rename posix_fallocate to fallocate
+		to split out the two possible uses. JRA. */
 #define SMB_VFS_INTERFACE_VERSION 28
 
 
@@ -168,6 +170,11 @@ enum vfs_translate_direction {
 	vfs_translate_to_windows
 };
 
+enum vfs_fallocate_mode {
+	VFS_FALLOCATE_EXTEND_SIZE = 0,
+	VFS_FALLOCATE_KEEP_SIZE = 1
+};
+
 /*
     Available VFS operations. These values must be in sync with vfs_ops struct
     (struct vfs_fn_pointers and struct vfs_handle_pointers inside of struct vfs_ops).
@@ -252,8 +259,9 @@ struct vfs_fn_pointers {
 		      const struct smb_filename *smb_fname,
 		      struct smb_file_time *ft);
 	int (*ftruncate)(struct vfs_handle_struct *handle, struct files_struct *fsp, SMB_OFF_T offset);
-	int (*posix_fallocate)(struct vfs_handle_struct *handle,
+	int (*fallocate)(struct vfs_handle_struct *handle,
 				struct files_struct *fsp,
+				enum vfs_fallocate_mode mode,
 				SMB_OFF_T offset,
 				SMB_OFF_T len);
 	bool (*lock)(struct vfs_handle_struct *handle, struct files_struct *fsp, int op, SMB_OFF_T offset, SMB_OFF_T count, int type);
@@ -608,8 +616,9 @@ int smb_vfs_call_ntimes(struct vfs_handle_struct *handle,
 			struct smb_file_time *ft);
 int smb_vfs_call_ftruncate(struct vfs_handle_struct *handle,
 			   struct files_struct *fsp, SMB_OFF_T offset);
-int smb_vfs_call_posix_fallocate(struct vfs_handle_struct *handle,
+int smb_vfs_call_fallocate(struct vfs_handle_struct *handle,
 			struct files_struct *fsp,
+			enum vfs_fallocate_mode mode,
 			SMB_OFF_T offset,
 			SMB_OFF_T len);
 bool smb_vfs_call_lock(struct vfs_handle_struct *handle,
diff --git a/source3/include/vfs_macros.h b/source3/include/vfs_macros.h
index 2eedd2bfbb..bb6428ead5 100644
--- a/source3/include/vfs_macros.h
+++ b/source3/include/vfs_macros.h
@@ -249,10 +249,10 @@
 #define SMB_VFS_NEXT_FTRUNCATE(handle, fsp, offset) \
 	smb_vfs_call_ftruncate((handle)->next, (fsp), (offset))
 
-#define SMB_VFS_POSIX_FALLOCATE(fsp, offset, len) \
-	smb_vfs_call_posix_fallocate((fsp)->conn->vfs_handles, (fsp), (offset), (len))
-#define SMB_VFS_NEXT_POSIX_FALLOCATE(handle, fsp, offset, len) \
-	smb_vfs_call_posix_fallocate((handle)->next, (fsp), (offset), (len))
+#define SMB_VFS_FALLOCATE(fsp, mode, offset, len) \
+	smb_vfs_call_fallocate((fsp)->conn->vfs_handles, (fsp), (mode), (offset), (len))
+#define SMB_VFS_NEXT_FALLOCATE(handle, fsp, mode, offset, len) \
+	smb_vfs_call_fallocate((handle)->next, (fsp), (mode), (offset), (len))
 
 #define SMB_VFS_LOCK(fsp, op, offset, count, type) \
 	smb_vfs_call_lock((fsp)->conn->vfs_handles, (fsp), (op), (offset), (count), (type))
diff --git a/source3/modules/vfs_default.c b/source3/modules/vfs_default.c
index 66dd5a912d..e08d48ff5f 100644
--- a/source3/modules/vfs_default.c
+++ b/source3/modules/vfs_default.c
@@ -848,12 +848,13 @@ static int strict_allocate_ftruncate(vfs_handle_struct *handle, files_struct *fs
 
 	space_to_write = len - pst->st_ex_size;
 
-	/* for allocation try posix_fallocate first. This can fail on some
+	/* for allocation try fallocate first. This can fail on some
 	   platforms e.g. when the filesystem doesn't support it and no
 	   emulation is being done by the libc (like on AIX with JFS1). In that
-	   case we do our own emulation. posix_fallocate implementations can
+	   case we do our own emulation. fallocate implementations can
 	   return ENOTSUP or EINVAL in cases like that. */
-	ret = SMB_VFS_POSIX_FALLOCATE(fsp, pst->st_ex_size, space_to_write);
+	ret = SMB_VFS_FALLOCATE(fsp, VFS_FALLOCATE_EXTEND_SIZE,
+				pst->st_ex_size, space_to_write);
 	if (ret == ENOSPC) {
 		errno = ENOSPC;
 		return -1;
@@ -861,7 +862,7 @@ static int strict_allocate_ftruncate(vfs_handle_struct *handle, files_struct *fs
 	if (ret == 0) {
 		return 0;
 	}
-	DEBUG(10,("strict_allocate_ftruncate: SMB_VFS_POSIX_FALLOCATE failed with "
+	DEBUG(10,("strict_allocate_ftruncate: SMB_VFS_FALLOCATE failed with "
 		"error %d. Falling back to slow manual allocation\n", ret));
 
 	/* available disk space is enough or not? */
@@ -953,16 +954,23 @@ static int vfswrap_ftruncate(vfs_handle_struct *handle, files_struct *fsp, SMB_O
 	return result;
 }
 
-static int vfswrap_posix_fallocate(vfs_handle_struct *handle,
+static int vfswrap_fallocate(vfs_handle_struct *handle,
 			files_struct *fsp,
+			enum vfs_fallocate_mode mode,
 			SMB_OFF_T offset,
 			SMB_OFF_T len)
 {
 	int result;
 
-	START_PROFILE(syscall_posix_fallocate);
-	result = sys_posix_fallocate(fsp->fh->fd, offset, len);
-	END_PROFILE(syscall_posix_fallocate);
+	START_PROFILE(syscall_fallocate);
+	if (mode == VFS_FALLOCATE_EXTEND_SIZE) {
+		result = sys_posix_fallocate(fsp->fh->fd, offset, len);
+	} else {
+		/* TODO - implement call into Linux fallocate call. */
+		errno = ENOSYS;
+		result = -1;
+	}
+	END_PROFILE(syscall_fallocate);
 	return result;
 }
 
@@ -1651,7 +1659,7 @@ static struct vfs_fn_pointers vfs_default_fns = {
 	.getwd = vfswrap_getwd,
 	.ntimes = vfswrap_ntimes,
 	.ftruncate = vfswrap_ftruncate,
-	.posix_fallocate = vfswrap_posix_fallocate,
+	.fallocate = vfswrap_fallocate,
 	.lock = vfswrap_lock,
 	.kernel_flock = vfswrap_kernel_flock,
 	.linux_setlease = vfswrap_linux_setlease,
diff --git a/source3/modules/vfs_full_audit.c b/source3/modules/vfs_full_audit.c
index b7c0888a22..10422fca79 100644
--- a/source3/modules/vfs_full_audit.c
+++ b/source3/modules/vfs_full_audit.c
@@ -124,7 +124,7 @@ typedef enum _vfs_op_type {
 	SMB_VFS_OP_GETWD,
 	SMB_VFS_OP_NTIMES,
 	SMB_VFS_OP_FTRUNCATE,
-	SMB_VFS_OP_POSIX_FALLOCATE,
+	SMB_VFS_OP_FALLOCATE,
 	SMB_VFS_OP_LOCK,
 	SMB_VFS_OP_KERNEL_FLOCK,
 	SMB_VFS_OP_LINUX_SETLEASE,
@@ -263,7 +263,7 @@ static struct {
 	{ SMB_VFS_OP_GETWD,	"getwd" },
 	{ SMB_VFS_OP_NTIMES,	"ntimes" },
 	{ SMB_VFS_OP_FTRUNCATE,	"ftruncate" },
-	{ SMB_VFS_OP_POSIX_FALLOCATE,"posix_fallocate" },
+	{ SMB_VFS_OP_FALLOCATE,"fallocate" },
 	{ SMB_VFS_OP_LOCK,	"lock" },
 	{ SMB_VFS_OP_KERNEL_FLOCK,	"kernel_flock" },
 	{ SMB_VFS_OP_LINUX_SETLEASE, "linux_setlease" },
@@ -1224,15 +1224,16 @@ static int smb_full_audit_ftruncate(vfs_handle_struct *handle, files_struct *fsp
 	return result;
 }
 
-static int smb_full_audit_posix_fallocate(vfs_handle_struct *handle, files_struct *fsp,
+static int smb_full_audit_fallocate(vfs_handle_struct *handle, files_struct *fsp,
+			   enum vfs_fallocate_mode mode,
 			   SMB_OFF_T offset,
 			   SMB_OFF_T len)
 {
 	int result;
 
-	result = SMB_VFS_NEXT_POSIX_FALLOCATE(handle, fsp, offset, len);
+	result = SMB_VFS_NEXT_FALLOCATE(handle, fsp, mode, offset, len);
 
-	do_log(SMB_VFS_OP_POSIX_FALLOCATE, (result >= 0), handle,
+	do_log(SMB_VFS_OP_FALLOCATE, (result >= 0), handle,
 	       "%s", fsp_str_do_log(fsp));
 
 	return result;
@@ -2234,7 +2235,7 @@ static struct vfs_fn_pointers vfs_full_audit_fns = {
 	.getwd = smb_full_audit_getwd,
 	.ntimes = smb_full_audit_ntimes,
 	.ftruncate = smb_full_audit_ftruncate,
-	.posix_fallocate = smb_full_audit_posix_fallocate,
+	.fallocate = smb_full_audit_fallocate,
 	.lock = smb_full_audit_lock,
 	.kernel_flock = smb_full_audit_kernel_flock,
 	.linux_setlease = smb_full_audit_linux_setlease,
diff --git a/source3/modules/vfs_streams_xattr.c b/source3/modules/vfs_streams_xattr.c
index 819f33d36e..fb83c5b789 100644
--- a/source3/modules/vfs_streams_xattr.c
+++ b/source3/modules/vfs_streams_xattr.c
@@ -1023,20 +1023,21 @@ static int streams_xattr_ftruncate(struct vfs_handle_struct *handle,
 	return 0;
 }
 
-static int streams_xattr_posix_fallocate(struct vfs_handle_struct *handle,
+static int streams_xattr_fallocate(struct vfs_handle_struct *handle,
 					struct files_struct *fsp,
+					enum vfs_fallocate_mode mode,
 					SMB_OFF_T offset,
 					SMB_OFF_T len)
 {
         struct stream_io *sio =
 		(struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
 
-	DEBUG(10, ("streams_xattr_posix_fallocate called for file %s offset %.0f"
+	DEBUG(10, ("streams_xattr_fallocate called for file %s offset %.0f"
 		"len = %.0f\n",
 		fsp_str_dbg(fsp), (double)offset, (double)len));
 
 	if (sio == NULL) {
-		return SMB_VFS_NEXT_POSIX_FALLOCATE(handle, fsp, offset, len);
+		return SMB_VFS_NEXT_FALLOCATE(handle, fsp, mode, offset, len);
 	}
 
 	if (!streams_xattr_recheck(sio)) {
@@ -1059,7 +1060,7 @@ static struct vfs_fn_pointers vfs_streams_xattr_fns = {
 	.unlink = streams_xattr_unlink,
 	.rename = streams_xattr_rename,
         .ftruncate = streams_xattr_ftruncate,
-        .posix_fallocate = streams_xattr_posix_fallocate,
+        .fallocate = streams_xattr_fallocate,
 	.streaminfo = streams_xattr_streaminfo,
 };
 
diff --git a/source3/modules/vfs_time_audit.c b/source3/modules/vfs_time_audit.c
index e9481b5d67..136807f067 100644
--- a/source3/modules/vfs_time_audit.c
+++ b/source3/modules/vfs_time_audit.c
@@ -905,8 +905,9 @@ static int smb_time_audit_ftruncate(vfs_handle_struct *handle,
 	return result;
 }
 
-static int smb_time_audit_posix_fallocate(vfs_handle_struct *handle,
+static int smb_time_audit_fallocate(vfs_handle_struct *handle,
 				    files_struct *fsp,
+				    enum vfs_fallocate_mode mode,
 				    SMB_OFF_T offset,
 				    SMB_OFF_T len)
 {
@@ -915,12 +916,12 @@ static int smb_time_audit_posix_fallocate(vfs_handle_struct *handle,
 	double timediff;
 
 	clock_gettime_mono(&ts1);
-	result = SMB_VFS_NEXT_POSIX_FALLOCATE(handle, fsp, offset, len);
+	result = SMB_VFS_NEXT_FALLOCATE(handle, fsp, mode, offset, len);
 	clock_gettime_mono(&ts2);
 	timediff = nsec_time_diff(&ts2,&ts1)*1.0e-9;
 
 	if (timediff > audit_timeout) {
-		smb_time_audit_log("posix_fallocate", timediff);
+		smb_time_audit_log("fallocate", timediff);
 	}
 
 	return result;
@@ -2357,7 +2358,7 @@ static struct vfs_fn_pointers vfs_time_audit_fns = {
 	.getwd = smb_time_audit_getwd,
 	.ntimes = smb_time_audit_ntimes,
 	.ftruncate = smb_time_audit_ftruncate,
-	.posix_fallocate = smb_time_audit_posix_fallocate,
+	.fallocate = smb_time_audit_fallocate,
 	.lock = smb_time_audit_lock,
 	.kernel_flock = smb_time_audit_kernel_flock,
 	.linux_setlease = smb_time_audit_linux_setlease,
diff --git a/source3/profile/profile.c b/source3/profile/profile.c
index 8013fc3956..c2704a1f0e 100644
--- a/source3/profile/profile.c
+++ b/source3/profile/profile.c
@@ -234,7 +234,7 @@ bool profile_setup(struct messaging_context *msg_ctx, bool rdonly)
 	    "syscall_getwd",		/* PR_VALUE_SYSCALL_GETWD */
 	    "syscall_ntimes",		/* PR_VALUE_SYSCALL_NTIMES */
 	    "syscall_ftruncate",	/* PR_VALUE_SYSCALL_FTRUNCATE */
-	    "syscall_posix_fallocate",	/* PR_VALUE_SYSCALL_POSIX_FALLOCATE */
+	    "syscall_fallocate",	/* PR_VALUE_SYSCALL_FALLOCATE */
 	    "syscall_fcntl_lock",	/* PR_VALUE_SYSCALL_FCNTL_LOCK */
 	    "syscall_kernel_flock",     /* PR_VALUE_SYSCALL_KERNEL_FLOCK */
 	    "syscall_linux_setlease",   /* PR_VALUE_SYSCALL_LINUX_SETLEASE */
diff --git a/source3/smbd/vfs.c b/source3/smbd/vfs.c
index 3055e37663..ee70a3d583 100644
--- a/source3/smbd/vfs.c
+++ b/source3/smbd/vfs.c
@@ -559,9 +559,10 @@ int vfs_set_filelen(files_struct *fsp, SMB_OFF_T len)
 }
 
 /****************************************************************************
- A slow version of posix_fallocate. Fallback code if SMB_VFS_POSIX_FALLOCATE
- fails. Needs to be outside of the default version of SMB_VFS_POSIX_FALLOCATE
+ A slow version of fallocate. Fallback code if SMB_VFS_FALLOCATE
+ fails. Needs to be outside of the default version of SMB_VFS_FALLOCATE
  as this is also called from the default SMB_VFS_FTRUNCATE code.
+ Always extends the file size.
  Returns 0 on success, errno on failure.
 ****************************************************************************/
 
@@ -639,12 +640,13 @@ int vfs_fill_sparse(files_struct *fsp, SMB_OFF_T len)
 
 	/* Only do this on non-stream file handles. */
 	if (fsp->base_fsp == NULL) {
-		/* for allocation try posix_fallocate first. This can fail on some
+		/* for allocation try fallocate first. This can fail on some
 		 * platforms e.g. when the filesystem doesn't support it and no
 		 * emulation is being done by the libc (like on AIX with JFS1). In that
-		 * case we do our own emulation. posix_fallocate implementations can
+		 * case we do our own emulation. fallocate implementations can
 		 * return ENOTSUP or EINVAL in cases like that. */
-		ret = SMB_VFS_POSIX_FALLOCATE(fsp, offset, num_to_write);
+		ret = SMB_VFS_FALLOCATE(fsp, VFS_FALLOCATE_EXTEND_SIZE,
+				offset, num_to_write);
 		if (ret == ENOSPC) {
 			errno = ENOSPC;
 			ret = -1;
@@ -653,7 +655,7 @@ int vfs_fill_sparse(files_struct *fsp, SMB_OFF_T len)
 		if (ret == 0) {
 			goto out;
 		}
-		DEBUG(10,("vfs_fill_sparse: SMB_VFS_POSIX_FALLOCATE failed with "
+		DEBUG(10,("vfs_fill_sparse: SMB_VFS_FALLOCATE failed with "
 			"error %d. Falling back to slow manual allocation\n", ret));
 	}
 
@@ -1451,13 +1453,14 @@ int smb_vfs_call_ftruncate(struct vfs_handle_struct *handle,
 	return handle->fns->ftruncate(handle, fsp, offset);
 }
 
-int smb_vfs_call_posix_fallocate(struct vfs_handle_struct *handle,
+int smb_vfs_call_fallocate(struct vfs_handle_struct *handle,
 				struct files_struct *fsp,
+				enum vfs_fallocate_mode mode,
 				SMB_OFF_T offset,
 				SMB_OFF_T len)
 {
-	VFS_FIND(posix_fallocate);
-	return handle->fns->posix_fallocate(handle, fsp, offset, len);
+	VFS_FIND(fallocate);
+	return handle->fns->fallocate(handle, fsp, mode, offset, len);
 }
 
 int smb_vfs_call_kernel_flock(struct vfs_handle_struct *handle,