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vfs: separate FMODE_PREAD/FMODE_PWRITE into separate flags 

Separate FMODE_PREAD and FMODE_PWRITE into separate flags to reflect the
reality that the read and write paths may have independent restrictions.

A git grep verifies that these flags are always cleared together so this
new behavior will only apply to interfaces that change to clear flags
individually.

This is required for "seq_file: properly cope with pread", a post-2.6.25
regression fix.

[akpm@linux-foundation.org: add comment]
Signed-off-by: Paul Turner <pjt@google.com>
Cc: Eric Biederman <ebiederm@xmission.com>
Cc:  Alexey Dobriyan <adobriyan@gmail.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: <stable@kernel.org>		[2.6.25.x, 2.6.26.x, 2.6.27.x, 2.6.28.x]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Paul Turner 2009-02-18 14:48:15 -08:00 committed by Linus Torvalds
parent b851ee7921
commit 55ec82176e
1 changed files with 12 additions and 6 deletions
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18
include/linux/fs.h
View File

@ -54,24 +54,30 @@ struct inodes_stat_t {
#define MAY_ACCESS 16
#define MAY_OPEN 32
/*
* flags in file.f_mode. Note that FMODE_READ and FMODE_WRITE must correspond
* to O_WRONLY and O_RDWR via the strange trick in __dentry_open()
*/
/* file is open for reading */
#define FMODE_READ ((__force fmode_t)1)
/* file is open for writing */
#define FMODE_WRITE ((__force fmode_t)2)
/* file is seekable */
#define FMODE_LSEEK ((__force fmode_t)4)
/* file can be accessed using pread/pwrite */
/* file can be accessed using pread */
#define FMODE_PREAD ((__force fmode_t)8)
#define FMODE_PWRITE FMODE_PREAD /* These go hand in hand */
/* file can be accessed using pwrite */
#define FMODE_PWRITE ((__force fmode_t)16)
/* File is opened for execution with sys_execve / sys_uselib */
#define FMODE_EXEC ((__force fmode_t)16)
#define FMODE_EXEC ((__force fmode_t)32)
/* File is opened with O_NDELAY (only set for block devices) */
#define FMODE_NDELAY ((__force fmode_t)32)
#define FMODE_NDELAY ((__force fmode_t)64)
/* File is opened with O_EXCL (only set for block devices) */
#define FMODE_EXCL ((__force fmode_t)64)
#define FMODE_EXCL ((__force fmode_t)128)
/* File is opened using open(.., 3, ..) and is writeable only for ioctls
(specialy hack for floppy.c) */
#define FMODE_WRITE_IOCTL ((__force fmode_t)128)
#define FMODE_WRITE_IOCTL ((__force fmode_t)256)
/*
* Don't update ctime and mtime.