gfapi: return pre/post attributes from glfs_ftruncate

Updates: #389
Change-Id: I8faea0828921fb17f05f7321c3cb01747373f21e
Signed-off-by: Kinglong Mee <mijinlong@open-fs.com>

4 files changed, 37 insertions, 8 deletions

diff --git a/api/src/gfapi.aliases b/api/src/gfapi.aliases
index 16777fa417c..0445c0ac640 100644
--- a/api/src/gfapi.aliases
+++ b/api/src/gfapi.aliases
@@ -34,7 +34,7 @@ _pub_glfs_preadv_async _glfs_preadv_async$GFAPI_3.4.0
 _pub_glfs_pwritev_async _glfs_pwritev_async$GFAPI_3.4.0
 _pub_glfs_lseek _glfs_lseek$GFAPI_3.4.0
 _pub_glfs_truncate _glfs_truncate$GFAPI_3.7.15
-_pub_glfs_ftruncate _glfs_ftruncate$GFAPI_3.4.0
+_pub_glfs_ftruncate34 _glfs_ftruncate34$GFAPI_3.4.0
 _pub_glfs_ftruncate_async _glfs_ftruncate_async$GFAPI_3.4.0
 _pub_glfs_lstat _glfs_lstat$GFAPI_3.4.0
 _pub_glfs_stat _glfs_stat$GFAPI_3.4.0
@@ -176,3 +176,4 @@ _pub_glfs_pread _glfs_pread$GFAPI_4.0.0
 _pub_glfs_pwrite _glfs_pwrite$GFAPI_4.0.0
 _pub_glfs_fsync _glfs_fsync$GFAPI_4.0.0
 _pub_glfs_fdatasync _glfs_fdatasync$GFAPI_4.0.0
+_pub_glfs_ftruncate _glfs_ftruncate$GFAPI_4.0.0
diff --git a/api/src/gfapi.map b/api/src/gfapi.map
index fec0f4ff807..fbf0985d990 100644
--- a/api/src/gfapi.map
+++ b/api/src/gfapi.map
@@ -37,7 +37,6 @@ GFAPI_3.4.0 {
 		glfs_preadv_async;
 		glfs_pwritev_async;
 		glfs_lseek;
-		glfs_ftruncate;
 		glfs_ftruncate_async;
 		glfs_lstat;
 		glfs_stat;
@@ -227,4 +226,5 @@ GFAPI_4.0.0 {
                 glfs_pwrite;
                 glfs_fsync;
                 glfs_fdatasync;
+                glfs_ftruncate;
 } GFAPI_3.13.0;
diff --git a/api/src/glfs-fops.c b/api/src/glfs-fops.c
index a63c175d052..1cd7669438f 100644
--- a/api/src/glfs-fops.c
+++ b/api/src/glfs-fops.c
@@ -1678,12 +1678,14 @@ invalid_fs:
 GFAPI_SYMVER_PUBLIC_DEFAULT(glfs_fdatasync_async, 3.4.0);
 
 
-int
-pub_glfs_ftruncate (struct glfs_fd *glfd, off_t offset)
+static int
+glfs_ftruncate_common (struct glfs_fd *glfd, off_t offset,
+                       struct stat *prestat, struct stat *poststat)
 {
 	int              ret = -1;
 	xlator_t        *subvol = NULL;
 	fd_t            *fd = NULL;
+        struct iatt      preiatt = {0, }, postiatt = {0, };
 
         DECLARE_OLD_THIS;
         __GLFS_ENTRY_VALIDATE_FD (glfd, invalid_fs);
@@ -1704,8 +1706,16 @@ pub_glfs_ftruncate (struct glfs_fd *glfd, off_t offset)
 		goto out;
 	}
 
-	ret = syncop_ftruncate (subvol, fd, offset, NULL, NULL);
+	ret = syncop_ftruncate (subvol, fd, offset, &preiatt, &postiatt,
+                                NULL, NULL);
         DECODE_SYNCOP_ERR (ret);
+
+        if (ret >= 0) {
+                if (prestat)
+                        glfs_iatt_to_stat (glfd->fs, &preiatt, prestat);
+                if (poststat)
+                        glfs_iatt_to_stat (glfd->fs, &postiatt, poststat);
+        }
 out:
 	if (fd)
 		fd_unref (fd);
@@ -1720,7 +1730,24 @@ invalid_fs:
 	return ret;
 }
 
-GFAPI_SYMVER_PUBLIC_DEFAULT(glfs_ftruncate, 3.4.0);
+int
+pub_glfs_ftruncate34 (struct glfs_fd *glfd, off_t offset)
+{
+        return glfs_ftruncate_common (glfd, offset, NULL, NULL);
+}
+
+GFAPI_SYMVER_PUBLIC(glfs_ftruncate34, glfs_ftruncate, 3.4.0);
+
+
+int
+pub_glfs_ftruncate (struct glfs_fd *glfd, off_t offset, struct stat *prestat,
+                    struct stat *poststat)
+{
+        return glfs_ftruncate_common (glfd, offset, prestat, poststat);
+}
+
+GFAPI_SYMVER_PUBLIC_DEFAULT(glfs_ftruncate, 4.0.0);
+
 
 int
 pub_glfs_truncate (struct glfs *fs, const char *path, off_t length)
diff --git a/api/src/glfs.h b/api/src/glfs.h
index 2addacb7ecf..e2f2a2c1804 100644
--- a/api/src/glfs.h
+++ b/api/src/glfs.h
@@ -571,8 +571,9 @@ off_t glfs_lseek (glfs_fd_t *fd, off_t offset, int whence) __THROW
 int glfs_truncate (glfs_t *fs, const char *path, off_t length) __THROW
         GFAPI_PUBLIC(glfs_truncate, 3.7.15);
 
-int glfs_ftruncate (glfs_fd_t *fd, off_t length) __THROW
-        GFAPI_PUBLIC(glfs_ftruncate, 3.4.0);
+int glfs_ftruncate (glfs_fd_t *fd, off_t length, struct stat *prestat,
+                    struct stat *poststat) __THROW
+        GFAPI_PUBLIC(glfs_ftruncate, 4.0.0);
 int glfs_ftruncate_async (glfs_fd_t *fd, off_t length, glfs_io_cbk fn,
 			  void *data) __THROW
         GFAPI_PUBLIC(glfs_ftruncate_async, 3.4.0);