Loading...
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 | /* * include/linux/writeback.h. */ #ifndef WRITEBACK_H #define WRITEBACK_H struct backing_dev_info; extern spinlock_t inode_lock; extern struct list_head inode_in_use; extern struct list_head inode_unused; /* * Yes, writeback.h requires sched.h * No, sched.h is not included from here. */ static inline int task_is_pdflush(struct task_struct *task) { return task->flags & PF_FLUSHER; } #define current_is_pdflush() task_is_pdflush(current) /* * fs/fs-writeback.c */ enum writeback_sync_modes { WB_SYNC_NONE, /* Don't wait on anything */ WB_SYNC_ALL, /* Wait on every mapping */ WB_SYNC_HOLD, /* Hold the inode on sb_dirty for sys_sync() */ }; /* * A control structure which tells the writeback code what to do. These are * always on the stack, and hence need no locking. They are always initialised * in a manner such that unspecified fields are set to zero. */ struct writeback_control { struct backing_dev_info *bdi; /* If !NULL, only write back this queue */ enum writeback_sync_modes sync_mode; unsigned long *older_than_this; /* If !NULL, only write back inodes older than this */ long nr_to_write; /* Write this many pages, and decrement this for each page written */ long pages_skipped; /* Pages which were not written */ /* * For a_ops->writepages(): is start or end are non-zero then this is * a hint that the filesystem need only write out the pages inside that * byterange. The byte at `end' is included in the writeout request. */ loff_t start; loff_t end; unsigned nonblocking:1; /* Don't get stuck on request queues */ unsigned encountered_congestion:1; /* An output: a queue is full */ unsigned for_kupdate:1; /* A kupdate writeback */ unsigned for_reclaim:1; /* Invoked from the page allocator */ unsigned for_writepages:1; /* This is a writepages() call */ }; /* * fs/fs-writeback.c */ void writeback_inodes(struct writeback_control *wbc); void wake_up_inode(struct inode *inode); int inode_wait(void *); void sync_inodes_sb(struct super_block *, int wait); void sync_inodes(int wait); /* writeback.h requires fs.h; it, too, is not included from here. */ static inline void wait_on_inode(struct inode *inode) { might_sleep(); wait_on_bit(&inode->i_state, __I_LOCK, inode_wait, TASK_UNINTERRUPTIBLE); } /* * mm/page-writeback.c */ int wakeup_pdflush(long nr_pages); void laptop_io_completion(void); void laptop_sync_completion(void); void throttle_vm_writeout(void); /* These are exported to sysctl. */ extern int dirty_background_ratio; extern int vm_dirty_ratio; extern int dirty_writeback_interval; extern int dirty_expire_interval; extern int block_dump; extern int laptop_mode; struct ctl_table; struct file; int dirty_writeback_centisecs_handler(struct ctl_table *, int, struct file *, void __user *, size_t *, loff_t *); void page_writeback_init(void); void balance_dirty_pages_ratelimited_nr(struct address_space *mapping, unsigned long nr_pages_dirtied); static inline void balance_dirty_pages_ratelimited(struct address_space *mapping) { balance_dirty_pages_ratelimited_nr(mapping, 1); } int pdflush_operation(void (*fn)(unsigned long), unsigned long arg0); int do_writepages(struct address_space *mapping, struct writeback_control *wbc); int sync_page_range(struct inode *inode, struct address_space *mapping, loff_t pos, loff_t count); int sync_page_range_nolock(struct inode *inode, struct address_space *mapping, loff_t pos, loff_t count); /* pdflush.c */ extern int nr_pdflush_threads; /* Global so it can be exported to sysctl read-only. */ #endif /* WRITEBACK_H */ |