From 2e4bef41a0f7df31be140ef354b9c12f2299016a Mon Sep 17 00:00:00 2001 From: Eric Van Hensbergen Date: Tue, 24 Jun 2008 17:39:39 -0500 Subject: [PATCH] 9p: fix O_APPEND in legacy mode The legacy protocol's open operation doesn't handle an append operation (it is expected that the client take care of it). We were incorrectly passing the extended protocol's flag through even in legacy mode. This was reported in bugzilla report #10689. This patch fixes the problem by disallowing extended protocol open modes from being passed in legacy mode and implemented append functionality on the client side by adding a seek after the open. Signed-off-by: Eric Van Hensbergen --- fs/9p/v9fs_vfs.h | 2 +- fs/9p/vfs_file.c | 4 +++- fs/9p/vfs_inode.c | 18 ++++++++++-------- 3 files changed, 14 insertions(+), 10 deletions(-) diff --git a/fs/9p/v9fs_vfs.h b/fs/9p/v9fs_vfs.h index fd01d90cad..57997fa14e 100644 --- a/fs/9p/v9fs_vfs.h +++ b/fs/9p/v9fs_vfs.h @@ -51,4 +51,4 @@ int v9fs_dir_release(struct inode *inode, struct file *filp); int v9fs_file_open(struct inode *inode, struct file *file); void v9fs_inode2stat(struct inode *inode, struct p9_stat *stat); void v9fs_dentry_release(struct dentry *); -int v9fs_uflags2omode(int uflags); +int v9fs_uflags2omode(int uflags, int extended); diff --git a/fs/9p/vfs_file.c b/fs/9p/vfs_file.c index 0d55affe37..52944d2249 100644 --- a/fs/9p/vfs_file.c +++ b/fs/9p/vfs_file.c @@ -59,7 +59,7 @@ int v9fs_file_open(struct inode *inode, struct file *file) P9_DPRINTK(P9_DEBUG_VFS, "inode: %p file: %p \n", inode, file); v9ses = v9fs_inode2v9ses(inode); - omode = v9fs_uflags2omode(file->f_flags); + omode = v9fs_uflags2omode(file->f_flags, v9fs_extended(v9ses)); fid = file->private_data; if (!fid) { fid = v9fs_fid_clone(file->f_path.dentry); @@ -75,6 +75,8 @@ int v9fs_file_open(struct inode *inode, struct file *file) inode->i_size = 0; inode->i_blocks = 0; } + if ((file->f_flags & O_APPEND) && (!v9fs_extended(v9ses))) + generic_file_llseek(file, 0, SEEK_END); } file->private_data = fid; diff --git a/fs/9p/vfs_inode.c b/fs/9p/vfs_inode.c index 40fa807bd9..c95295c650 100644 --- a/fs/9p/vfs_inode.c +++ b/fs/9p/vfs_inode.c @@ -132,10 +132,10 @@ static int p9mode2unixmode(struct v9fs_session_info *v9ses, int mode) /** * v9fs_uflags2omode- convert posix open flags to plan 9 mode bits * @uflags: flags to convert - * + * @extended: if .u extensions are active */ -int v9fs_uflags2omode(int uflags) +int v9fs_uflags2omode(int uflags, int extended) { int ret; @@ -155,14 +155,16 @@ int v9fs_uflags2omode(int uflags) break; } - if (uflags & O_EXCL) - ret |= P9_OEXCL; - if (uflags & O_TRUNC) ret |= P9_OTRUNC; - if (uflags & O_APPEND) - ret |= P9_OAPPEND; + if (extended) { + if (uflags & O_EXCL) + ret |= P9_OEXCL; + + if (uflags & O_APPEND) + ret |= P9_OAPPEND; + } return ret; } @@ -506,7 +508,7 @@ v9fs_vfs_create(struct inode *dir, struct dentry *dentry, int mode, flags = O_RDWR; fid = v9fs_create(v9ses, dir, dentry, NULL, perm, - v9fs_uflags2omode(flags)); + v9fs_uflags2omode(flags, v9fs_extended(v9ses))); if (IS_ERR(fid)) { err = PTR_ERR(fid); fid = NULL; -- 2.39.5