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| author | Matthew Wilcox (Oracle) <willy@infradead.org> | 2021-04-07 23:18:56 +0300 |
|---|---|---|
| committer | David Howells <dhowells@redhat.com> | 2021-04-23 11:28:43 +0300 |
| commit | c790fbf20a53e8297c97ddb1c0c9d41c060067f3 (patch) | |
| tree | 30027eae6616f16b38f681284fda601c6b16b2ee /include/linux/fs.h | |
| parent | fcd9ae4f7f3b5fbd549285bab0478a339113620e (diff) | |
| download | linux-c790fbf20a53e8297c97ddb1c0c9d41c060067f3.tar.xz | |
fs: Document file_ra_state
Turn the comments into kernel-doc and improve the wording slightly.
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: David Howells <dhowells@redhat.com>
Tested-by: Jeff Layton <jlayton@kernel.org>
Tested-by: Dave Wysochanski <dwysocha@redhat.com>
Tested-By: Marc Dionne <marc.dionne@auristor.com>
Link: https://lore.kernel.org/r/20210407201857.3582797-3-willy@infradead.org/
Link: https://lore.kernel.org/r/161789068619.6155.1397999970593531574.stgit@warthog.procyon.org.uk/ # v6
Diffstat (limited to 'include/linux/fs.h')
| -rw-r--r-- | include/linux/fs.h | 24 |
1 files changed, 14 insertions, 10 deletions
diff --git a/include/linux/fs.h b/include/linux/fs.h index ec8f3ddf4a6a..33831a8bda52 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -891,18 +891,22 @@ struct fown_struct { int signum; /* posix.1b rt signal to be delivered on IO */ }; -/* - * Track a single file's readahead state +/** + * struct file_ra_state - Track a file's readahead state. + * @start: Where the most recent readahead started. + * @size: Number of pages read in the most recent readahead. + * @async_size: Start next readahead when this many pages are left. + * @ra_pages: Maximum size of a readahead request. + * @mmap_miss: How many mmap accesses missed in the page cache. + * @prev_pos: The last byte in the most recent read request. */ struct file_ra_state { - pgoff_t start; /* where readahead started */ - unsigned int size; /* # of readahead pages */ - unsigned int async_size; /* do asynchronous readahead when - there are only # of pages ahead */ - - unsigned int ra_pages; /* Maximum readahead window */ - unsigned int mmap_miss; /* Cache miss stat for mmap accesses */ - loff_t prev_pos; /* Cache last read() position */ + pgoff_t start; + unsigned int size; + unsigned int async_size; + unsigned int ra_pages; + unsigned int mmap_miss; + loff_t prev_pos; }; /* |