Rev 422 | Details | Compare with Previous | Last modification | View Log | RSS feed
| Rev | Author | Line No. | Line |
|---|---|---|---|
| 422 | giacomo | 1 | /* |
| 2 | * include/linux/writeback.h. |
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| 3 | */ |
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| 4 | #ifndef WRITEBACK_H |
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| 5 | #define WRITEBACK_H |
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| 6 | |||
| 7 | struct backing_dev_info; |
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| 8 | |||
| 9 | extern spinlock_t inode_lock; |
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| 10 | extern struct list_head inode_in_use; |
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| 11 | extern struct list_head inode_unused; |
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| 12 | |||
| 13 | /* |
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| 14 | * Yes, writeback.h requires sched.h |
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| 15 | * No, sched.h is not included from here. |
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| 16 | */ |
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| 17 | static inline int current_is_pdflush(void) |
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| 18 | { |
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| 19 | return current->flags & PF_FLUSHER; |
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| 20 | } |
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| 21 | |||
| 22 | /* |
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| 23 | * fs/fs-writeback.c |
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| 24 | */ |
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| 25 | enum writeback_sync_modes { |
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| 26 | WB_SYNC_NONE, /* Don't wait on anything */ |
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| 27 | WB_SYNC_ALL, /* Wait on every mapping */ |
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| 28 | WB_SYNC_HOLD, /* Hold the inode on sb_dirty for sys_sync() */ |
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| 29 | }; |
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| 30 | |||
| 31 | /* |
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| 32 | * A control structure which tells the writeback code what to do |
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| 33 | */ |
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| 34 | struct writeback_control { |
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| 35 | struct backing_dev_info *bdi; /* If !NULL, only write back this |
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| 36 | queue */ |
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| 37 | enum writeback_sync_modes sync_mode; |
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| 38 | unsigned long *older_than_this; /* If !NULL, only write back inodes |
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| 39 | older than this */ |
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| 40 | long nr_to_write; /* Write this many pages, and decrement |
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| 41 | this for each page written */ |
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| 42 | int nonblocking; /* Don't get stuck on request queues */ |
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| 43 | int encountered_congestion; /* An output: a queue is full */ |
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| 44 | int for_kupdate; /* A kupdate writeback */ |
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| 45 | int for_reclaim; /* Invoked from the page allocator */ |
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| 46 | }; |
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| 47 | |||
| 48 | /* |
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| 49 | * ->writepage() return values (make these much larger than a pagesize, in |
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| 50 | * case some fs is returning number-of-bytes-written from writepage) |
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| 51 | */ |
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| 52 | #define WRITEPAGE_ACTIVATE 0x80000 /* IO was not started: activate page */ |
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| 53 | |||
| 54 | /* |
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| 55 | * fs/fs-writeback.c |
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| 56 | */ |
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| 57 | void writeback_inodes(struct writeback_control *wbc); |
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| 58 | void wake_up_inode(struct inode *inode); |
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| 59 | void __wait_on_inode(struct inode * inode); |
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| 60 | void sync_inodes_sb(struct super_block *, int wait); |
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| 61 | void sync_inodes(int wait); |
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| 62 | |||
| 63 | /* writeback.h requires fs.h; it, too, is not included from here. */ |
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| 64 | static inline void wait_on_inode(struct inode *inode) |
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| 65 | { |
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| 66 | if (inode->i_state & I_LOCK) |
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| 67 | __wait_on_inode(inode); |
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| 68 | } |
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| 69 | |||
| 70 | /* |
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| 71 | * mm/page-writeback.c |
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| 72 | */ |
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| 73 | int wakeup_bdflush(long nr_pages); |
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| 74 | |||
| 75 | /* These 5 are exported to sysctl. */ |
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| 76 | extern int dirty_background_ratio; |
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| 77 | extern int vm_dirty_ratio; |
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| 78 | extern int dirty_writeback_centisecs; |
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| 79 | extern int dirty_expire_centisecs; |
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| 80 | |||
| 81 | struct ctl_table; |
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| 82 | struct file; |
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| 83 | int dirty_writeback_centisecs_handler(struct ctl_table *, int, struct file *, |
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| 84 | void __user *, size_t *); |
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| 85 | |||
| 86 | void page_writeback_init(void); |
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| 87 | void balance_dirty_pages_ratelimited(struct address_space *mapping); |
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| 88 | int pdflush_operation(void (*fn)(unsigned long), unsigned long arg0); |
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| 89 | int do_writepages(struct address_space *mapping, struct writeback_control *wbc); |
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| 90 | |||
| 91 | /* pdflush.c */ |
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| 92 | extern int nr_pdflush_threads; /* Global so it can be exported to sysctl |
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| 93 | read-only. */ |
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| 94 | |||
| 95 | |||
| 96 | #endif /* WRITEBACK_H */ |