From c43b3e5a349adff40c660ea78f5e856e6ba5d9ec Mon Sep 17 00:00:00 2001
From: Xiang Xiao <xiaoxiang@xiaomi.com>
Date: Wed, 22 Aug 2018 06:08:34 -0600
Subject: [PATCH] fs/hostfs: Add ftruncate support.
---
arch/sim/src/up_hostfs.c | 9 ++++++++
fs/hostfs/hostfs.c | 44 ++++++++++++++++++++++++++++++++++++++++
2 files changed, 53 insertions(+)
diff --git a/arch/sim/src/up_hostfs.c b/arch/sim/src/up_hostfs.c
index 839d951708..df3a03da03 100644
--- a/arch/sim/src/up_hostfs.c
+++ b/arch/sim/src/up_hostfs.c
@@ -250,6 +250,15 @@ int host_fstat(int fd, struct nuttx_stat_s *buf)
return ret;
}
+/****************************************************************************
+ * Name: host_truncate
+ ****************************************************************************/
+
+int host_ftruncate(int fd, off_t length)
+{
+ return ftruncate(fd, length);
+}
+
/****************************************************************************
* Name: host_opendir
****************************************************************************/
diff --git a/fs/hostfs/hostfs.c b/fs/hostfs/hostfs.c
index 715d4ad325..25534941c0 100644
--- a/fs/hostfs/hostfs.c
+++ b/fs/hostfs/hostfs.c
@@ -82,6 +82,8 @@ static int hostfs_dup(FAR const struct file *oldp,
FAR struct file *newp);
static int hostfs_fstat(FAR const struct file *filep,
FAR struct stat *buf);
+static int hostfs_ftruncate(FAR struct file *filep,
+ off_t length);
static int hostfs_opendir(FAR struct inode *mountpt,
FAR const char *relpath,
@@ -139,6 +141,7 @@ const struct mountpt_operations hostfs_operations =
hostfs_sync, /* sync */
hostfs_dup, /* dup */
hostfs_fstat, /* fstat */
+ hostfs_ftruncate, /* ftruncate */
hostfs_opendir, /* opendir */
hostfs_closedir, /* closedir */
@@ -722,6 +725,47 @@ static int hostfs_fstat(FAR const struct file *filep, FAR struct stat *buf)
return ret;
}
+/****************************************************************************
+ * Name: hostfs_ftruncate
+ *
+ * Description:
+ * Set the length of the open, regular file associated with the file
+ * structure 'filep' to 'length'.
+ *
+ ****************************************************************************/
+
+static int hostfs_ftruncate(FAR struct file *filep, off_t length)
+{
+ FAR struct inode *inode;
+ FAR struct hostfs_mountpt_s *fs;
+ FAR struct hostfs_ofile_s *hf;
+ int ret = OK;
+
+ /* Sanity checks */
+
+ DEBUGASSERT(filep != NULL);
+
+ /* Recover our private data from the struct file instance */
+
+ DEBUGASSERT(filep->f_priv != NULL && filep->f_inode != NULL);
+ hf = filep->f_priv;
+ inode = filep->f_inode;
+
+ fs = inode->i_private;
+ DEBUGASSERT(fs != NULL);
+
+ /* Take the semaphore */
+
+ hostfs_semtake(fs);
+
+ /* Call the host to perform the truncate */
+
+ ret = host_ftruncate(hf->fd, length);
+
+ hostfs_semgive(fs);
+ return ret;
+}
+
/****************************************************************************
* Name: hostfs_opendir
*