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vfs: mnt_want_write_file(): fix special file handling

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I suspect that mnt_want_write_file() may have wrong assumption.  I think
mnt_want_write_file() is assuming it increments ->mnt_writers if
(file->f_mode & FMODE_WRITE).  But, if it's special_file(), it is false?

Signed-off-by: OGAWA Hirofumi <[email protected]>
Acked-by: Dave Hansen <[email protected]>
Cc: Al Viro <[email protected]>
Cc: Nick Piggin <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
OGAWA Hirofumi 2009-08-06 15:07:39 -07:00 • committed by Linus Torvalds
commit 2d8dd38a5a
1 changed files with 2 additions and 1 deletions
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3
fs/namespace.c
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@ -316,7 +316,8 @@ EXPORT_SYMBOL_GPL(mnt_clone_write);
*/
int mnt_want_write_file(struct file *file)
{
if (!(file->f_mode & FMODE_WRITE))
struct inode *inode = file->f_dentry->d_inode;
if (!(file->f_mode & FMODE_WRITE) || special_file(inode->i_mode))
return mnt_want_write(file->f_path.mnt);
else
return mnt_clone_write(file->f_path.mnt);