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