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Rev | Author | Line No. | Line |
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4559 | Serge | 1 | #ifndef _LINUX_FS_H |
2 | #define _LINUX_FS_H |
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6293 | serge | 3 | #include |
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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4559 | Serge | 97 | #endif /* _LINUX_FS_H */><>><>><>><>><>><>><>><>><>><>><>><>><>><>><>><>><> |