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authorMatthew Wilcox (Oracle) <willy@infradead.org>2020-10-16 05:06:10 +0200
committerLinus Torvalds <torvalds@linux-foundation.org>2020-10-16 20:11:15 +0200
commit1aa83cfa5a20a6bbd39d2355a89c95152e4b37b4 (patch)
tree400b9455fe6fa89c76d77fadb9685f0432a8a569 /fs/ext4/verity.c
parentmm: fix a race during THP splitting (diff)
downloadlinux-1aa83cfa5a20a6bbd39d2355a89c95152e4b37b4.tar.xz
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mm/readahead: add DEFINE_READAHEAD
Patch series "Readahead patches for 5.9/5.10". These are infrastructure for both the THP patchset and for the fscache rewrite, For both pieces of infrastructure being build on top of this patchset, we want the ractl to be available higher in the call-stack. For David's work, he wants to add the 'critical page' to the ractl so that he knows which page NEEDS to be brought in from storage, and which ones are nice-to-have. We might want something similar in block storage too. It used to be simple -- the first page was the critical one, but then mmap added fault-around and so for that usecase, the middle page is the critical one. Anyway, I don't have any code to show that yet, we just know that the lowest point in the callchain where we have that information is do_sync_mmap_readahead() and so the ractl needs to start its life there. For THP, we havew the code that needs it. It's actually the apex patch to the series; the one which finally starts to allocate THPs and present them to consenting filesystems: http://git.infradead.org/users/willy/pagecache.git/commitdiff/798bcf30ab2eff278caad03a9edca74d2f8ae760 This patch (of 8): Allow for a more concise definition of a struct readahead_control. Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Cc: Eric Biggers <ebiggers@google.com> Cc: David Howells <dhowells@redhat.com> Link: https://lkml.kernel.org/r/20200903140844.14194-1-willy@infradead.org Link: https://lkml.kernel.org/r/20200903140844.14194-3-willy@infradead.org Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/ext4/verity.c')
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