Commit 55ec8217 authored by Paul Turner's avatar Paul Turner Committed by Linus Torvalds

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: default avatarPaul 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: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent b851ee79
...@@ -54,24 +54,30 @@ struct inodes_stat_t { ...@@ -54,24 +54,30 @@ struct inodes_stat_t {
#define MAY_ACCESS 16 #define MAY_ACCESS 16
#define MAY_OPEN 32 #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 */ /* file is open for reading */
#define FMODE_READ ((__force fmode_t)1) #define FMODE_READ ((__force fmode_t)1)
/* file is open for writing */ /* file is open for writing */
#define FMODE_WRITE ((__force fmode_t)2) #define FMODE_WRITE ((__force fmode_t)2)
/* file is seekable */ /* file is seekable */
#define FMODE_LSEEK ((__force fmode_t)4) #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_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 */ /* 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) */ /* 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) */ /* 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 /* File is opened using open(.., 3, ..) and is writeable only for ioctls
(specialy hack for floppy.c) */ (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. * Don't update ctime and mtime.
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment