From 458c5eb191d80591b0acd893f092043cb0590fc2 Mon Sep 17 00:00:00 2001
From: =?utf8?q?Jean-Pierre=20Andr=C3=A9?= <jpandre@users.sourceforge.net>
Date: Mon, 23 Jan 2012 17:49:38 +0100
Subject: [PATCH] Worked around write checks for ftruncate() and access(W_OK)
 on OpenIndiana

When a file is created with no write permissions, ftruncate and
access(W_OK) should be allowed, but this check has to be made by the
file system on OpenIndiana.
This patch is not active on Linux (#ifdef'ed)
---
 src/lowntfs-3g.c | 61 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 61 insertions(+)

diff --git a/src/lowntfs-3g.c b/src/lowntfs-3g.c
index 8c89489e..8898ea4b 100644
--- a/src/lowntfs-3g.c
+++ b/src/lowntfs-3g.c
@@ -174,13 +174,21 @@ struct open_file {
 	fuse_ino_t ino;
 	fuse_ino_t parent;
 	int state;
+#if defined(__sun) && defined (__SVR4)
+	pid_t tid;
+#endif /* defined(__sun) && defined (__SVR4) */
 } ;
 
 enum {
 	CLOSE_GHOST = 1,
 	CLOSE_COMPRESSED = 2,
 	CLOSE_ENCRYPTED = 4,
+#if defined(__sun) && defined (__SVR4)
+	CLOSE_DMTIME = 8,
+	CLOSE_WRITING = 16
+#else /* defined(__sun) && defined (__SVR4) */
 	CLOSE_DMTIME = 8
+#endif /* defined(__sun) && defined (__SVR4) */
 };
 
 static struct ntfs_options opts;
@@ -1178,6 +1186,31 @@ static void ntfs_fuse_readdir(fuse_req_t req, fuse_ino_t ino, size_t size,
 		fuse_reply_err(req, -err);
 }
 
+#if defined(__sun) && defined (__SVR4)
+
+/*
+ *		When a file is created with a read-only mode,
+ *	access for writing and ftruncating are allowed to the thread
+ *	which is creating.
+ */
+
+static BOOL check_open_for_writing(fuse_ino_t ino, pid_t tid)
+{
+	BOOL ok;
+	struct open_file *of;
+
+	ok = FALSE;
+	of = ctx->open_files;
+	while (of && (of->ino != ino))
+		of = of->next;
+	if (of && (of->state & CLOSE_WRITING) && (of->tid == tid)) {
+		ok = TRUE;
+	}
+	return (ok);
+}
+
+#endif /* defined(__sun) && defined (__SVR4) */
+
 static void ntfs_fuse_open(fuse_req_t req, fuse_ino_t ino,
 		      struct fuse_file_info *fi)
 {
@@ -1213,6 +1246,9 @@ static void ntfs_fuse_open(fuse_req_t req, fuse_ino_t ino,
 #endif
 			if ((res >= 0)
 			    && (fi->flags & (O_WRONLY | O_RDWR))) {
+#if defined(__sun) && defined (__SVR4)
+				state |= CLOSE_WRITING;
+#endif /* defined(__sun) && defined (__SVR4) */
 			/* mark a future need to compress the last chunk */
 				if (na->data_flags & ATTR_COMPRESSION_MASK)
 					state |= CLOSE_COMPRESSED;
@@ -1244,6 +1280,13 @@ static void ntfs_fuse_open(fuse_req_t req, fuse_ino_t ino,
 			of->parent = 0;
 			of->ino = ino;
 			of->state = state;
+#if defined(__sun) && defined (__SVR4)
+#if !KERNELPERMS | (POSIXACLS & !KERNELACLS)
+			of->tid = security.tid;
+#else
+			of->tid = fuse_req_ctx(req)->pid;
+#endif
+#endif /* defined(__sun) && defined (__SVR4) */
 			of->next = ctx->open_files;
 			of->previous = (struct open_file*)NULL;
 			if (ctx->open_files)
@@ -1743,8 +1786,14 @@ static void ntfs_fuse_setattr(fuse_req_t req, fuse_ino_t ino, struct stat *attr,
 	}
 						/* size */
 	if (!res && (to_set & FUSE_SET_ATTR_SIZE)) {
+#if defined(__sun) && defined (__SVR4)
+		res = ntfs_fuse_trunc(&security, ino, attr->st_size,
+					!fi && !check_open_for_writing(ino,
+						security.tid), &stbuf);
+#else
 		res = ntfs_fuse_trunc(&security, ino, attr->st_size,
 					!fi, &stbuf);
+#endif /* defined(__sun) && defined (__SVR4) */
 	}
 						/* some set of atime/mtime */
 	if (!res && (to_set & (FUSE_SET_ATTR_ATIME + FUSE_SET_ATTR_MTIME))) {
@@ -1776,6 +1825,13 @@ static void ntfs_fuse_access(fuse_req_t req, fuse_ino_t ino, int mask)
 		else
 			res = -EOPNOTSUPP;
 	} else {
+#if defined(__sun) && defined (__SVR4)
+		if ((mask & W_OK) && check_open_for_writing(ino,
+						security.tid)) {
+			fuse_reply_err(req, 0);
+			return;
+		}
+#endif /* defined(__sun) && defined (__SVR4) */
 		ni = ntfs_inode_open(ctx->vol, INODE(ino));
 		if (!ni) {
 			res = -errno;
@@ -1952,7 +2008,12 @@ exit:
 		if (of) {
 			of->parent = 0;
 			of->ino = e->ino;
+#if defined(__sun) && defined (__SVR4)
+			of->state = state | CLOSE_WRITING;
+			of->tid = security.tid;
+#else /* defined(__sun) && defined (__SVR4) */
 			of->state = state;
+#endif /* defined(__sun) && defined (__SVR4) */
 			of->next = ctx->open_files;
 			of->previous = (struct open_file*)NULL;
 			if (ctx->open_files)
-- 
2.11.0