gluster: add fallocate fop support

Implement support for the fallocate file operation. fallocate
allocates blocks for a particular inode such that future writes
to the associated region of the file are guaranteed not to fail
with ENOSPC.

This patch adds fallocate support to the following areas:

	- libglusterfs
	- mount/fuse
	- io-stats
	- performance/md-cache,open-behind
	- quota
	- cluster/afr,dht,stripe
	- rpc/xdr
	- protocol/client,server
	- io-threads
	- marker
	- storage/posix
	- libgfapi

BUG: 949242
Change-Id: Ice8e61351f9d6115c5df68768bc844abbf0ce8bd
Signed-off-by: Brian Foster <bfoster@redhat.com>
Reviewed-on: http://review.gluster.org/4969
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Anand Avati <avati@redhat.com>

13 files changed, 212 insertions, 0 deletions

diff --git a/libglusterfs/src/call-stub.c b/libglusterfs/src/call-stub.c
index bd81c4ed..2bb99341 100644
--- a/libglusterfs/src/call-stub.c
+++ b/libglusterfs/src/call-stub.c
@@ -2130,6 +2130,61 @@ out:
         return stub;
 }
 
+call_stub_t *
+fop_fallocate_cbk_stub(call_frame_t *frame, fop_fallocate_cbk_t fn,
+                       int32_t op_ret, int32_t op_errno,
+                       struct iatt *statpre, struct iatt *statpost,
+		       dict_t *xdata)
+{
+        call_stub_t *stub = NULL;
+
+        GF_VALIDATE_OR_GOTO ("call-stub", frame, out);
+
+        stub = stub_new (frame, 0, GF_FOP_FALLOCATE);
+        GF_VALIDATE_OR_GOTO ("call-stub", stub, out);
+
+        stub->fn_cbk.fallocate = fn;
+
+        stub->args_cbk.op_ret = op_ret;
+        stub->args_cbk.op_errno = op_errno;
+
+        if (statpre)
+                stub->args_cbk.prestat = *statpre;
+        if (statpost)
+                stub->args_cbk.poststat = *statpost;
+        if (xdata)
+                stub->args_cbk.xdata = dict_ref (xdata);
+out:
+        return stub;
+}
+
+call_stub_t *
+fop_fallocate_stub(call_frame_t *frame, fop_fallocate_t fn, fd_t *fd,
+		   int32_t mode, off_t offset, size_t len, dict_t *xdata)
+{
+        call_stub_t *stub = NULL;
+
+        GF_VALIDATE_OR_GOTO ("call-stub", frame, out);
+        GF_VALIDATE_OR_GOTO ("call-stub", fn, out);
+
+        stub = stub_new (frame, 1, GF_FOP_FALLOCATE);
+        GF_VALIDATE_OR_GOTO ("call-stub", stub, out);
+
+        stub->fn.fallocate = fn;
+
+        if (fd)
+                stub->args.fd = fd_ref (fd);
+
+	stub->args.flags = mode;
+	stub->args.offset = offset;
+	stub->args.size = len;
+
+        if (xdata)
+                stub->args.xdata = dict_ref (xdata);
+out:
+        return stub;
+
+}
 
 static void
 call_resume_wind (call_stub_t *stub)
@@ -2347,6 +2402,12 @@ call_resume_wind (call_stub_t *stub)
 				   stub->args.fd, &stub->args.stat,
 				   stub->args.valid, stub->args.xdata);
                 break;
+	case GF_FOP_FALLOCATE:
+		stub->fn.fallocate(stub->frame, stub->frame->this,
+				   stub->args.fd, stub->args.flags,
+				   stub->args.offset, stub->args.size,
+				   stub->args.xdata);
+		break;
         default:
                 gf_log_callingfn ("call-stub", GF_LOG_ERROR,
                                   "Invalid value of FOP (%d)",
@@ -2541,6 +2602,10 @@ call_resume_unwind (call_stub_t *stub)
 		STUB_UNWIND (stub, fsetattr, &stub->args_cbk.prestat,
 			     &stub->args_cbk.poststat, stub->args_cbk.xdata);
                 break;
+	case GF_FOP_FALLOCATE:
+		STUB_UNWIND(stub, fallocate, &stub->args_cbk.prestat,
+			    &stub->args_cbk.poststat, stub->args_cbk.xdata);
+		break;
         default:
                 gf_log_callingfn ("call-stub", GF_LOG_ERROR,
                                   "Invalid value of FOP (%d)",
diff --git a/libglusterfs/src/call-stub.h b/libglusterfs/src/call-stub.h
index 33511183..d940fe6f 100644
--- a/libglusterfs/src/call-stub.h
+++ b/libglusterfs/src/call-stub.h
@@ -69,6 +69,7 @@ typedef struct {
 		fop_fxattrop_t fxattrop;
 		fop_setattr_t setattr;
 		fop_fsetattr_t fsetattr;
+		fop_fallocate_t fallocate;
 	} fn;
 
 	union {
@@ -113,6 +114,7 @@ typedef struct {
 		fop_fxattrop_cbk_t fxattrop;
 		fop_setattr_cbk_t setattr;
 		fop_fsetattr_cbk_t fsetattr;
+		fop_fallocate_cbk_t fallocate;
 	} fn_cbk;
 
 	struct {
@@ -713,6 +715,20 @@ fop_fsetattr_cbk_stub (call_frame_t *frame,
                        struct iatt *statpre,
                        struct iatt *statpost, dict_t *xdata);
 
+call_stub_t *
+fop_fallocate_stub(call_frame_t *frame,
+		   fop_fallocate_t fn,
+		   fd_t *fd,
+		   int32_t mode, off_t offset,
+		   size_t len, dict_t *xdata);
+
+call_stub_t *
+fop_fallocate_cbk_stub(call_frame_t *frame,
+		       fop_fallocate_cbk_t fn,
+                       int32_t op_ret, int32_t op_errno,
+                       struct iatt *statpre, struct iatt *statpost,
+                       dict_t *xdata);
+
 void call_resume (call_stub_t *stub);
 void call_stub_destroy (call_stub_t *stub);
 void call_unwind_error (call_stub_t *stub, int op_ret, int op_errno);
diff --git a/libglusterfs/src/compat.h b/libglusterfs/src/compat.h
index 3d0cee1a..2bd98254 100644
--- a/libglusterfs/src/compat.h
+++ b/libglusterfs/src/compat.h
@@ -32,6 +32,12 @@
 #include <linux/limits.h>
 #include <sys/xattr.h>
 #include <endian.h>
+#ifdef HAVE_FALLOC_H
+#include <linux/falloc.h>
+#else
+#define FALLOC_FL_KEEP_SIZE     0x01 /* default is extend size */
+#define FALLOC_FL_PUNCH_HOLE    0x02 /* de-allocates range */
+#endif
 
 
 #ifndef HAVE_LLISTXATTR
diff --git a/libglusterfs/src/defaults.c b/libglusterfs/src/defaults.c
index 5bac845c..32454a1e 100644
--- a/libglusterfs/src/defaults.c
+++ b/libglusterfs/src/defaults.c
@@ -455,6 +455,15 @@ default_fsetattr_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
 }
 
 int32_t
+default_fallocate_cbk(call_frame_t *frame, void *cookie, xlator_t *this,
+                      int32_t op_ret, int32_t op_errno, struct iatt *pre,
+                      struct iatt *post, dict_t *xdata)
+{
+	STACK_UNWIND_STRICT(fallocate, frame, op_ret, op_errno, pre, post, xdata);
+	return 0;
+}
+
+int32_t
 default_getspec_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                      int32_t op_ret, int32_t op_errno, char *spec_data)
 {
@@ -862,6 +871,17 @@ default_fsetattr_resume (call_frame_t *frame, xlator_t *this, fd_t *fd,
         return 0;
 }
 
+int32_t
+default_fallocate_resume(call_frame_t *frame, xlator_t *this, fd_t *fd,
+			 int32_t keep_size, off_t offset, size_t len, dict_t *xdata)
+{
+	STACK_WIND(frame, default_fallocate_cbk, FIRST_CHILD(this),
+		   FIRST_CHILD(this)->fops->fallocate, fd, keep_size, offset, len,
+		   xdata);
+        return 0;
+}
+
+
 /* FOPS */
 
 int32_t
@@ -1266,6 +1286,15 @@ default_fsetattr (call_frame_t *frame, xlator_t *this, fd_t *fd,
         return 0;
 }
 
+int32_t
+default_fallocate(call_frame_t *frame, xlator_t *this, fd_t *fd,
+		  int32_t keep_size, off_t offset, size_t len, dict_t *xdata)
+{
+	STACK_WIND_TAIL(frame, FIRST_CHILD(this),
+			FIRST_CHILD(this)->fops->fallocate, fd, keep_size, offset,
+			len, xdata);
+	return 0;
+}
 
 int32_t
 default_forget (xlator_t *this, inode_t *inode)
diff --git a/libglusterfs/src/defaults.h b/libglusterfs/src/defaults.h
index 8a9de789..bc2f6429 100644
--- a/libglusterfs/src/defaults.h
+++ b/libglusterfs/src/defaults.h
@@ -243,6 +243,12 @@ int32_t default_fsetattr (call_frame_t *frame,
                           struct iatt *stbuf,
                           int32_t valid, dict_t *xdata);
 
+int32_t default_fallocate(call_frame_t *frame,
+			  xlator_t *this,
+			  fd_t *fd,
+			  int32_t keep_size, off_t offset,
+			  size_t len, dict_t *xdata);
+
 /* Resume */
 int32_t default_getspec_resume (call_frame_t *frame,
                                 xlator_t *this,
@@ -453,6 +459,13 @@ int32_t default_fsetattr_resume (call_frame_t *frame,
                           struct iatt *stbuf,
                           int32_t valid, dict_t *xdata);
 
+int32_t default_fallocate_resume(call_frame_t *frame,
+				 xlator_t *this,
+				 fd_t *fd,
+				 int32_t keep_size, off_t offset,
+				 size_t len, dict_t *xdata);
+
+
 /* _cbk */
 
 int32_t
@@ -663,6 +676,11 @@ default_fsetattr_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                       int32_t op_ret, int32_t op_errno, struct iatt *statpre,
                       struct iatt *statpost, dict_t *xdata);
 
+int32_t default_fallocate_cbk(call_frame_t *frame, void *cookie, xlator_t *this,
+			      int32_t op_ret, int32_t op_errno, struct iatt *pre,
+			      struct iatt *post, dict_t *xdata);
+
+
 int32_t
 default_getspec_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
                      int32_t op_ret, int32_t op_errno, char *spec_data);
diff --git a/libglusterfs/src/globals.c b/libglusterfs/src/globals.c
index 05ff52c2..ba5075b2 100644
--- a/libglusterfs/src/globals.c
+++ b/libglusterfs/src/globals.c
@@ -67,6 +67,7 @@ const char *gf_fop_list[GF_FOP_MAXVALUE] = {
         [GF_FOP_RELEASE]     = "RELEASE",
         [GF_FOP_RELEASEDIR]  = "RELEASEDIR",
         [GF_FOP_FREMOVEXATTR]= "FREMOVEXATTR",
+	[GF_FOP_FALLOCATE]   = "FALLOCATE",
 };
 /* THIS */
 
diff --git a/libglusterfs/src/glusterfs.h b/libglusterfs/src/glusterfs.h
index 8ee55c70..013cdfff 100644
--- a/libglusterfs/src/glusterfs.h
+++ b/libglusterfs/src/glusterfs.h
@@ -197,6 +197,7 @@ typedef enum {
         GF_FOP_RELEASEDIR,
         GF_FOP_GETSPEC,
         GF_FOP_FREMOVEXATTR,
+	GF_FOP_FALLOCATE,
         GF_FOP_MAXVALUE,
 } glusterfs_fop_t;
 
diff --git a/libglusterfs/src/syncop.c b/libglusterfs/src/syncop.c
index 8e5db41f..f57e8da5 100644
--- a/libglusterfs/src/syncop.c
+++ b/libglusterfs/src/syncop.c
@@ -1917,6 +1917,37 @@ syncop_access (xlator_t *subvol, loc_t *loc, int32_t mask)
 
 
 int
+syncop_fallocate_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+                      int op_ret, int op_errno, struct iatt *prebuf,
+                      struct iatt *postbuf, dict_t *xdata)
+{
+	struct syncargs *args = NULL;
+
+        args = cookie;
+
+        args->op_ret   = op_ret;
+        args->op_errno = op_errno;
+
+        __wake (args);
+
+	return 0;
+}
+
+int
+syncop_fallocate(xlator_t *subvol, fd_t *fd, int32_t keep_size, off_t offset,
+		 size_t len)
+{
+        struct syncargs args = {0, };
+
+        SYNCOP (subvol, (&args), syncop_fallocate_cbk, subvol->fops->fallocate,
+                fd, keep_size, offset, len, NULL);
+
+        errno = args.op_errno;
+        return args.op_ret;
+}
+
+
+int
 syncop_lk_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
 	       int op_ret, int op_errno, struct gf_flock *flock,
 	       dict_t *xdata)
diff --git a/libglusterfs/src/syncop.h b/libglusterfs/src/syncop.h
index 98e88ff3..59e62ad1 100644
--- a/libglusterfs/src/syncop.h
+++ b/libglusterfs/src/syncop.h
@@ -333,6 +333,8 @@ int syncop_mkdir (xlator_t *subvol, loc_t *loc, mode_t mode, dict_t *dict,
 int syncop_link (xlator_t *subvol, loc_t *oldloc, loc_t *newloc);
 int syncop_fsyncdir (xlator_t *subvol, fd_t *fd, int datasync);
 int syncop_access (xlator_t *subvol, loc_t *loc, int32_t mask);
+int syncop_fallocate(xlator_t *subvol, fd_t *fd, int32_t keep_size, off_t offset,
+		     size_t len);
 
 int syncop_rename (xlator_t *subvol, loc_t *oldloc, loc_t *newloc);
 
diff --git a/libglusterfs/src/syscall.c b/libglusterfs/src/syscall.c
index bb834dbf..e8954cc2 100644
--- a/libglusterfs/src/syscall.c
+++ b/libglusterfs/src/syscall.c
@@ -458,3 +458,26 @@ sys_access (const char *pathname, int mode)
 {
         return access (pathname, mode);
 }
+
+
+int
+sys_fallocate(int fd, int mode, off_t offset, off_t len)
+{
+#ifdef HAVE_FALLOCATE
+	return fallocate(fd, mode, offset, len);
+#endif
+
+#ifdef HAVE_POSIX_FALLOCATE
+	if (mode) {
+		/* keep size not supported */
+		errno = EOPNOTSUPP;
+		return -1;
+	}
+
+	return posix_fallocate(fd, offset, len);
+#endif
+
+	errno = ENOSYS;
+	return -1;
+}
+
diff --git a/libglusterfs/src/syscall.h b/libglusterfs/src/syscall.h
index d5c6ce5f..f1c9f58c 100644
--- a/libglusterfs/src/syscall.h
+++ b/libglusterfs/src/syscall.h
@@ -139,4 +139,6 @@ sys_access (const char *pathname, int mode);
 int
 sys_ftruncate (int fd, off_t length);
 
+int sys_fallocate(int fd, int mode, off_t offset, off_t len);
+
 #endif /* __SYSCALL_H__ */
diff --git a/libglusterfs/src/xlator.c b/libglusterfs/src/xlator.c
index f9e5db67..1926240e 100644
--- a/libglusterfs/src/xlator.c
+++ b/libglusterfs/src/xlator.c
@@ -79,6 +79,7 @@ fill_defaults (xlator_t *xl)
         SET_DEFAULT_FOP (fxattrop);
         SET_DEFAULT_FOP (setattr);
         SET_DEFAULT_FOP (fsetattr);
+	SET_DEFAULT_FOP (fallocate);
 
         SET_DEFAULT_FOP (getspec);
 
diff --git a/libglusterfs/src/xlator.h b/libglusterfs/src/xlator.h
index 43fd0638..ace73f2e 100644
--- a/libglusterfs/src/xlator.h
+++ b/libglusterfs/src/xlator.h
@@ -417,6 +417,14 @@ typedef int32_t (*fop_fsetattr_cbk_t) (call_frame_t *frame,
                                        struct iatt *preop_stbuf,
                                        struct iatt *postop_stbuf, dict_t *xdata);
 
+typedef int32_t (*fop_fallocate_cbk_t) (call_frame_t *frame,
+                                        void *cookie,
+                                        xlator_t *this,
+                                        int32_t op_ret,
+                                        int32_t op_errno,
+                                        struct iatt *preop_stbuf,
+                                        struct iatt *postop_stbuf, dict_t *xdata);
+
 typedef int32_t (*fop_lookup_t) (call_frame_t *frame,
                                  xlator_t *this,
                                  loc_t *loc,
@@ -634,6 +642,13 @@ typedef int32_t (*fop_fsetattr_t) (call_frame_t *frame,
                                    struct iatt *stbuf,
                                    int32_t valid, dict_t *xdata);
 
+typedef int32_t (*fop_fallocate_t) (call_frame_t *frame,
+                                    xlator_t *this,
+                                    fd_t *fd,
+				    int32_t keep_size,
+				    off_t offset,
+				    size_t len,
+                                    dict_t *xdata);
 
 struct xlator_fops {
         fop_lookup_t         lookup;
@@ -678,6 +693,7 @@ struct xlator_fops {
         fop_setattr_t        setattr;
         fop_fsetattr_t       fsetattr;
         fop_getspec_t        getspec;
+	fop_fallocate_t	     fallocate;
 
         /* these entries are used for a typechecking hack in STACK_WIND _only_ */
         fop_lookup_cbk_t         lookup_cbk;
@@ -722,6 +738,7 @@ struct xlator_fops {
         fop_setattr_cbk_t        setattr_cbk;
         fop_fsetattr_cbk_t       fsetattr_cbk;
         fop_getspec_cbk_t        getspec_cbk;
+	fop_fallocate_cbk_t	 fallocate_cbk;
 };
 
 typedef int32_t (*cbk_forget_t) (xlator_t *this,