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Date: Sat, 18 Oct 2014 19:21:28 +0400
From: Dmitry Monakhov <dmonakhov@...nvz.org>
To: linux-kernel@...r.kernel.org
Cc: linux-fsdevel@...r.kernel.org, viro@...iv.linux.org.uk,
hch@...radead.org, Dmitry Monakhov <dmonakhov@...nvz.org>
Subject: [PATCH 4/4] cifs: add set_flag callback
Add set_flag callback which is called from fcntl(F_SETFL)
Share common logic for cifs_open and cifs_set_flags
I'm not cifs expert, but it is looks like toggling O_DIRECT on file is
unsafe operation so disable it temporally.
Signed-off-by: Dmitry Monakhov <dmonakhov@...nvz.org>
---
fs/cifs/cifsfs.c | 6 ++++++
fs/cifs/cifsfs.h | 1 +
fs/cifs/file.c | 37 ++++++++++++++++++++++++++++++-------
3 files changed, 37 insertions(+), 7 deletions(-)
diff --git a/fs/cifs/cifsfs.c b/fs/cifs/cifsfs.c
index 889b984..18ad412 100644
--- a/fs/cifs/cifsfs.c
+++ b/fs/cifs/cifsfs.c
@@ -918,6 +918,7 @@ const struct file_operations cifs_file_ops = {
.mmap = cifs_file_mmap,
.splice_read = generic_file_splice_read,
.llseek = cifs_llseek,
+ .set_flags = cifs_set_flags,
#ifdef CONFIG_CIFS_POSIX
.unlocked_ioctl = cifs_ioctl,
#endif /* CONFIG_CIFS_POSIX */
@@ -938,6 +939,7 @@ const struct file_operations cifs_file_strict_ops = {
.mmap = cifs_file_strict_mmap,
.splice_read = generic_file_splice_read,
.llseek = cifs_llseek,
+ .set_flags = cifs_set_flags,
#ifdef CONFIG_CIFS_POSIX
.unlocked_ioctl = cifs_ioctl,
#endif /* CONFIG_CIFS_POSIX */
@@ -958,6 +960,7 @@ const struct file_operations cifs_file_direct_ops = {
.flush = cifs_flush,
.mmap = cifs_file_mmap,
.splice_read = generic_file_splice_read,
+ .set_flags = cifs_set_flags,
#ifdef CONFIG_CIFS_POSIX
.unlocked_ioctl = cifs_ioctl,
#endif /* CONFIG_CIFS_POSIX */
@@ -978,6 +981,7 @@ const struct file_operations cifs_file_nobrl_ops = {
.mmap = cifs_file_mmap,
.splice_read = generic_file_splice_read,
.llseek = cifs_llseek,
+ .set_flags = cifs_set_flags,
#ifdef CONFIG_CIFS_POSIX
.unlocked_ioctl = cifs_ioctl,
#endif /* CONFIG_CIFS_POSIX */
@@ -997,6 +1001,7 @@ const struct file_operations cifs_file_strict_nobrl_ops = {
.mmap = cifs_file_strict_mmap,
.splice_read = generic_file_splice_read,
.llseek = cifs_llseek,
+ .set_flags = cifs_set_flags,
#ifdef CONFIG_CIFS_POSIX
.unlocked_ioctl = cifs_ioctl,
#endif /* CONFIG_CIFS_POSIX */
@@ -1016,6 +1021,7 @@ const struct file_operations cifs_file_direct_nobrl_ops = {
.flush = cifs_flush,
.mmap = cifs_file_mmap,
.splice_read = generic_file_splice_read,
+ .set_flags = cifs_set_flags,
#ifdef CONFIG_CIFS_POSIX
.unlocked_ioctl = cifs_ioctl,
#endif /* CONFIG_CIFS_POSIX */
diff --git a/fs/cifs/cifsfs.h b/fs/cifs/cifsfs.h
index 002e0c1..353190d 100644
--- a/fs/cifs/cifsfs.h
+++ b/fs/cifs/cifsfs.h
@@ -92,6 +92,7 @@ extern const struct file_operations cifs_file_strict_ops; /* if strictio mnt */
extern const struct file_operations cifs_file_nobrl_ops; /* no brlocks */
extern const struct file_operations cifs_file_direct_nobrl_ops;
extern const struct file_operations cifs_file_strict_nobrl_ops;
+extern int cifs_set_flags(struct file *filp, unsigned arg);
extern int cifs_open(struct inode *inode, struct file *file);
extern int cifs_close(struct inode *inode, struct file *file);
extern int cifs_closedir(struct inode *inode, struct file *file);
diff --git a/fs/cifs/file.c b/fs/cifs/file.c
index dc3c7e6..5167ecb 100644
--- a/fs/cifs/file.c
+++ b/fs/cifs/file.c
@@ -431,6 +431,33 @@ void cifsFileInfo_put(struct cifsFileInfo *cifs_file)
kfree(cifs_file);
}
+int cifs_set_flags(struct file *file, unsigned arg)
+{
+ struct cifs_sb_info *cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
+ int rc = 0;
+
+ spin_lock(&file->f_lock);
+ if ((file->f_flags ^ arg) & O_DIRECT) {
+ /*
+ * TODO: Toggling O_DIRECT is not obvious task,
+ * temproraly disabled for safity reason
+ */
+ rc = -EINVAL;
+ goto out;
+ }
+ file->f_flags = (arg & SETFL_MASK) | (file->f_flags & ~SETFL_MASK);
+ if (file->f_flags & O_DIRECT &&
+ cifs_sb->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO) {
+ if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
+ file->f_op = &cifs_file_direct_nobrl_ops;
+ else
+ file->f_op = &cifs_file_direct_ops;
+ }
+out:
+ spin_unlock(&file->f_lock);
+ return rc;
+}
+
int cifs_open(struct inode *inode, struct file *file)
{
@@ -467,13 +494,9 @@ int cifs_open(struct inode *inode, struct file *file)
cifs_dbg(FYI, "inode = 0x%p file flags are 0x%x for %s\n",
inode, file->f_flags, full_path);
- if (file->f_flags & O_DIRECT &&
- cifs_sb->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO) {
- if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
- file->f_op = &cifs_file_direct_nobrl_ops;
- else
- file->f_op = &cifs_file_direct_ops;
- }
+ rc = cifs_set_flags(file, file->f_flags);
+ if (rc)
+ goto out;
if (server->oplocks)
oplock = REQ_OPLOCK;
--
1.7.1
--
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