1,3 → 1,97 |
#ifndef _LINUX_FS_H |
#define _LINUX_FS_H |
#include <linux/list.h> |
#include <linux/bug.h> |
#include <linux/mutex.h> |
#include <linux/rwsem.h> |
#define MAY_EXEC 0x00000001 |
#define MAY_WRITE 0x00000002 |
#define MAY_READ 0x00000004 |
#define MAY_APPEND 0x00000008 |
#define MAY_ACCESS 0x00000010 |
#define MAY_OPEN 0x00000020 |
#define MAY_CHDIR 0x00000040 |
/* called from RCU mode, don't block */ |
#define MAY_NOT_BLOCK 0x00000080 |
/* |
* Attribute flags. These should be or-ed together to figure out what |
* has been changed! |
*/ |
#define ATTR_MODE (1 << 0) |
#define ATTR_UID (1 << 1) |
#define ATTR_GID (1 << 2) |
#define ATTR_SIZE (1 << 3) |
#define ATTR_ATIME (1 << 4) |
#define ATTR_MTIME (1 << 5) |
#define ATTR_CTIME (1 << 6) |
#define ATTR_ATIME_SET (1 << 7) |
#define ATTR_MTIME_SET (1 << 8) |
#define ATTR_FORCE (1 << 9) /* Not a change, but a change it */ |
#define ATTR_ATTR_FLAG (1 << 10) |
#define ATTR_KILL_SUID (1 << 11) |
#define ATTR_KILL_SGID (1 << 12) |
#define ATTR_FILE (1 << 13) |
#define ATTR_KILL_PRIV (1 << 14) |
#define ATTR_OPEN (1 << 15) /* Truncating from open(O_TRUNC) */ |
#define ATTR_TIMES_SET (1 << 16) |
/* |
* inode->i_mutex nesting subclasses for the lock validator: |
* |
* 0: the object of the current VFS operation |
* 1: parent |
* 2: child/target |
* 3: xattr |
* 4: second non-directory |
* 5: second parent (when locking independent directories in rename) |
* |
* I_MUTEX_NONDIR2 is for certain operations (such as rename) which lock two |
* non-directories at once. |
* |
* The locking order between these classes is |
* parent[2] -> child -> grandchild -> normal -> xattr -> second non-directory |
*/ |
enum inode_i_mutex_lock_class |
{ |
I_MUTEX_NORMAL, |
I_MUTEX_PARENT, |
I_MUTEX_CHILD, |
I_MUTEX_XATTR, |
I_MUTEX_NONDIR2, |
I_MUTEX_PARENT2, |
}; |
struct file { |
|
/* |
* Protects f_ep_links, f_flags. |
* Must not be taken from IRQ context. |
*/ |
spinlock_t f_lock; |
atomic_long_t f_count; |
unsigned int f_flags; |
fmode_t f_mode; |
|
/* needed for tty driver, and maybe others */ |
void *private_data; |
|
struct page **pages; /* physical memory backend */ |
unsigned int count; |
unsigned int allocated; |
void *vma; |
|
} __attribute__((aligned(4))); /* lest something weird decides that 2 is OK */ |
#define get_file_rcu(x) atomic_long_inc_not_zero(&(x)->f_count) |
#define fput_atomic(x) atomic_long_add_unless(&(x)->f_count, -1, 1) |
#define file_count(x) atomic_long_read(&(x)->f_count) |
#define FL_POSIX 1 |
#define FL_FLOCK 2 |
#define FL_DELEG 4 /* NFSv4 delegation */ |
#define FL_ACCESS 8 /* not trying to lock, just looking */ |
#define FL_EXISTS 16 /* when unlocking, test for existence */ |
#define FL_LEASE 32 /* lease held on this file */ |
#define FL_CLOSE 64 /* unlock on close */ |
#define FL_SLEEP 128 /* A blocking lock */ |
#define FL_DOWNGRADE_PENDING 256 /* Lease is being downgraded */ |
#define FL_UNLOCK_PENDING 512 /* Lease is being broken */ |
#define FL_OFDLCK 1024 /* lock is "owned" by struct file */ |
#define FL_LAYOUT 2048 /* outstanding pNFS layout */ |
#endif /* _LINUX_FS_H */ |