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1 | #ifndef _LINUX_FS_H |
1 | #ifndef _LINUX_FS_H |
2 | #define _LINUX_FS_H |
2 | #define _LINUX_FS_H |
- | 3 | #include |
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- | 4 | #include |
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- | 5 | #include |
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- | 6 | #include |
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- | 7 | #define MAY_EXEC 0x00000001 |
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- | 8 | #define MAY_WRITE 0x00000002 |
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- | 9 | #define MAY_READ 0x00000004 |
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- | 10 | #define MAY_APPEND 0x00000008 |
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- | 11 | #define MAY_ACCESS 0x00000010 |
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- | 12 | #define MAY_OPEN 0x00000020 |
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- | 13 | #define MAY_CHDIR 0x00000040 |
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- | 14 | /* called from RCU mode, don't block */ |
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- | 15 | #define MAY_NOT_BLOCK 0x00000080 |
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- | 16 | /* |
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- | 17 | * Attribute flags. These should be or-ed together to figure out what |
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- | 18 | * has been changed! |
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- | 19 | */ |
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- | 20 | #define ATTR_MODE (1 << 0) |
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- | 21 | #define ATTR_UID (1 << 1) |
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- | 22 | #define ATTR_GID (1 << 2) |
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- | 23 | #define ATTR_SIZE (1 << 3) |
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- | 24 | #define ATTR_ATIME (1 << 4) |
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- | 25 | #define ATTR_MTIME (1 << 5) |
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- | 26 | #define ATTR_CTIME (1 << 6) |
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- | 27 | #define ATTR_ATIME_SET (1 << 7) |
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- | 28 | #define ATTR_MTIME_SET (1 << 8) |
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- | 29 | #define ATTR_FORCE (1 << 9) /* Not a change, but a change it */ |
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- | 30 | #define ATTR_ATTR_FLAG (1 << 10) |
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- | 31 | #define ATTR_KILL_SUID (1 << 11) |
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- | 32 | #define ATTR_KILL_SGID (1 << 12) |
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- | 33 | #define ATTR_FILE (1 << 13) |
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- | 34 | #define ATTR_KILL_PRIV (1 << 14) |
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- | 35 | #define ATTR_OPEN (1 << 15) /* Truncating from open(O_TRUNC) */ |
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- | 36 | #define ATTR_TIMES_SET (1 << 16) |
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- | 37 | /* |
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- | 38 | * inode->i_mutex nesting subclasses for the lock validator: |
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- | 39 | * |
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- | 40 | * 0: the object of the current VFS operation |
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- | 41 | * 1: parent |
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- | 42 | * 2: child/target |
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- | 43 | * 3: xattr |
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- | 44 | * 4: second non-directory |
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- | 45 | * 5: second parent (when locking independent directories in rename) |
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- | 46 | * |
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- | 47 | * I_MUTEX_NONDIR2 is for certain operations (such as rename) which lock two |
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- | 48 | * non-directories at once. |
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- | 49 | * |
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- | 50 | * The locking order between these classes is |
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- | 51 | * parent[2] -> child -> grandchild -> normal -> xattr -> second non-directory |
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- | 52 | */ |
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- | 53 | enum inode_i_mutex_lock_class |
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- | 54 | { |
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- | 55 | I_MUTEX_NORMAL, |
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- | 56 | I_MUTEX_PARENT, |
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- | 57 | I_MUTEX_CHILD, |
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- | 58 | I_MUTEX_XATTR, |
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- | 59 | I_MUTEX_NONDIR2, |
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- | 60 | I_MUTEX_PARENT2, |
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- | 61 | }; |
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- | 62 | struct file { |
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- | 63 | ||
- | 64 | /* |
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- | 65 | * Protects f_ep_links, f_flags. |
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- | 66 | * Must not be taken from IRQ context. |
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- | 67 | */ |
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- | 68 | spinlock_t f_lock; |
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- | 69 | atomic_long_t f_count; |
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- | 70 | unsigned int f_flags; |
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- | 71 | fmode_t f_mode; |
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- | 72 | ||
- | 73 | /* needed for tty driver, and maybe others */ |
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- | 74 | void *private_data; |
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- | 75 | ||
- | 76 | struct page **pages; /* physical memory backend */ |
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- | 77 | unsigned int count; |
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- | 78 | unsigned int allocated; |
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- | 79 | void *vma; |
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- | 80 | ||
- | 81 | } __attribute__((aligned(4))); /* lest something weird decides that 2 is OK */ |
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- | 82 | #define get_file_rcu(x) atomic_long_inc_not_zero(&(x)->f_count) |
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- | 83 | #define fput_atomic(x) atomic_long_add_unless(&(x)->f_count, -1, 1) |
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- | 84 | #define file_count(x) atomic_long_read(&(x)->f_count) |
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- | 85 | #define FL_POSIX 1 |
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- | 86 | #define FL_FLOCK 2 |
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- | 87 | #define FL_DELEG 4 /* NFSv4 delegation */ |
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- | 88 | #define FL_ACCESS 8 /* not trying to lock, just looking */ |
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- | 89 | #define FL_EXISTS 16 /* when unlocking, test for existence */ |
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- | 90 | #define FL_LEASE 32 /* lease held on this file */ |
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- | 91 | #define FL_CLOSE 64 /* unlock on close */ |
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- | 92 | #define FL_SLEEP 128 /* A blocking lock */ |
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- | 93 | #define FL_DOWNGRADE_PENDING 256 /* Lease is being downgraded */ |
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- | 94 | #define FL_UNLOCK_PENDING 512 /* Lease is being broken */ |
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- | 95 | #define FL_OFDLCK 1024 /* lock is "owned" by struct file */ |
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- | 96 | #define FL_LAYOUT 2048 /* outstanding pNFS layout */ |
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3 | #endif /* _LINUX_FS_H */ |
97 | #endif /* _LINUX_FS_H */><>><>><>><>><>><>><>><>><>><>><>><>><>><>><>><>><> |