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/*
* include/linux/writeback.h.
*
* These declarations are private to fs/ and mm/.
* Declarations which are exported to filesystems do not
* get placed here.
*/
#ifndef WRITEBACK_H
#define WRITEBACK_H
extern spinlock_t inode_lock;
extern struct list_head inode_in_use;
extern struct list_head inode_unused;
/*
* fs/fs-writeback.c
*/
#define WB_SYNC_NONE 0 /* Don't wait on anything */
#define WB_SYNC_LAST 1 /* Wait on the last-written mapping */
#define WB_SYNC_ALL 2 /* Wait on every mapping */
void try_to_writeback_unused_inodes(unsigned long pexclusive);
void writeback_single_inode(struct inode *inode,
int sync, int *nr_to_write);
void writeback_unlocked_inodes(int *nr_to_write, int sync_mode,
unsigned long *older_than_this);
void writeback_inodes_sb(struct super_block *);
void __wait_on_inode(struct inode * inode);
void sync_inodes(void);
static inline void wait_on_inode(struct inode *inode)
{
if (inode->i_state & I_LOCK)
__wait_on_inode(inode);
}
/*
* mm/page-writeback.c
*/
/*
* How much data to write out at a time in various places. This isn't
* really very important - it's just here to prevent any thread from
* locking an inode for too long and blocking other threads which wish
* to write the same file for allocation throttling purposes.
*/
#define WRITEOUT_PAGES ((4096 * 1024) / PAGE_CACHE_SIZE)
void balance_dirty_pages(struct address_space *mapping);
void balance_dirty_pages_ratelimited(struct address_space *mapping);
int pdflush_flush(unsigned long nr_pages);
int pdflush_operation(void (*fn)(unsigned long), unsigned long arg0);
#endif /* WRITEBACK_H */
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