diff options
Diffstat (limited to 'include/linux/fs.h')
| -rw-r--r-- | include/linux/fs.h | 61 |
1 files changed, 6 insertions, 55 deletions
diff --git a/include/linux/fs.h b/include/linux/fs.h index 29cb32d3a849..d33beadd9a43 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -695,16 +695,12 @@ struct fown_struct { /* * Track a single file's readahead state - * - * ================#============|==================#==================| - * ^ ^ ^ ^ - * file_ra_state.la_index .ra_index .lookahead_index .readahead_index */ struct file_ra_state { - pgoff_t la_index; /* enqueue time */ - pgoff_t ra_index; /* begin offset */ - pgoff_t lookahead_index; /* time to do next readahead */ - pgoff_t readahead_index; /* end offset */ + pgoff_t start; /* where readahead started */ + unsigned long size; /* # of readahead pages */ + unsigned long async_size; /* do asynchronous readahead when + there are only # of pages ahead */ unsigned long ra_pages; /* Maximum readahead window */ unsigned long mmap_hit; /* Cache hit stat for mmap accesses */ @@ -714,59 +710,14 @@ struct file_ra_state { }; /* - * Measuring read-ahead sizes. - * - * |----------- readahead size ------------>| - * ===#============|==================#=====================| - * |------- invoke interval ------>|-- lookahead size -->| - */ -static inline unsigned long ra_readahead_size(struct file_ra_state *ra) -{ - return ra->readahead_index - ra->ra_index; -} - -static inline unsigned long ra_lookahead_size(struct file_ra_state *ra) -{ - return ra->readahead_index - ra->lookahead_index; -} - -static inline unsigned long ra_invoke_interval(struct file_ra_state *ra) -{ - return ra->lookahead_index - ra->la_index; -} - -/* * Check if @index falls in the readahead windows. */ static inline int ra_has_index(struct file_ra_state *ra, pgoff_t index) { - return (index >= ra->la_index && - index < ra->readahead_index); -} - -/* - * Where is the old read-ahead and look-ahead? - */ -static inline void ra_set_index(struct file_ra_state *ra, - pgoff_t la_index, pgoff_t ra_index) -{ - ra->la_index = la_index; - ra->ra_index = ra_index; + return (index >= ra->start && + index < ra->start + ra->size); } -/* - * Where is the new read-ahead and look-ahead? - */ -static inline void ra_set_size(struct file_ra_state *ra, - unsigned long ra_size, unsigned long la_size) -{ - ra->readahead_index = ra->ra_index + ra_size; - ra->lookahead_index = ra->ra_index + ra_size - la_size; -} - -unsigned long ra_submit(struct file_ra_state *ra, - struct address_space *mapping, struct file *filp); - struct file { /* * fu_list becomes invalid after file_free is called and queued via |