From: David Howells <dhowells@redhat.com>
To: "Matthew Wilcox (Oracle)" <willy@infradead.org>
Cc: Jeff Layton <jlayton@kernel.org>,
Dominique Martinet <asmadeus@codewreck.org>,
kafs-testing@auristor.com, dhowells@redhat.com,
Jeff Layton <jlayton@kernel.org>,
Ilya Dryomov <idryomov@gmail.com>,
Dominique Martinet <asmadeus@codewreck.org>,
linux-fsdevel@vger.kernel.org, linux-cachefs@redhat.com,
v9fs-developer@lists.sourceforge.net,
linux-afs@lists.infradead.org, ceph-devel@vger.kernel.org,
linux-cifs@vger.kernel.org, linux-nfs@vger.kernel.org,
devel@lists.orangefs.org, linux-mm@kvack.org,
linux-kernel@vger.kernel.org
Subject: [PATCH v5 2/4] folio: Add a function to get the host inode for a folio
Date: Wed, 10 Nov 2021 21:08:24 +0000 [thread overview]
Message-ID: <163657850401.834781.1031963517399283294.stgit@warthog.procyon.org.uk> (raw)
In-Reply-To: <163657847613.834781.7923681076643317435.stgit@warthog.procyon.org.uk>
Add a convenience function, folio_inode() that will get the host inode from
a folio's mapping.
Changes:
ver #3:
- Fix mistake in function description[2].
ver #2:
- Fix contradiction between doc and implementation by disallowing use
with swap caches[1].
Signed-off-by: David Howells <dhowells@redhat.com>
Reviewed-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Tested-by: Jeff Layton <jlayton@kernel.org>
Tested-by: Dominique Martinet <asmadeus@codewreck.org>
Tested-by: kafs-testing@auristor.com
Link: https://lore.kernel.org/r/YST8OcVNy02Rivbm@casper.infradead.org/ [1]
Link: https://lore.kernel.org/r/YYKLkBwQdtn4ja+i@casper.infradead.org/ [2]
Link: https://lore.kernel.org/r/162880453171.3369675.3704943108660112470.stgit@warthog.procyon.org.uk/ # rfc
Link: https://lore.kernel.org/r/162981151155.1901565.7010079316994382707.stgit@warthog.procyon.org.uk/
Link: https://lore.kernel.org/r/163005744370.2472992.18324470937328925723.stgit@warthog.procyon.org.uk/ # v2
Link: https://lore.kernel.org/r/163584184628.4023316.9386282630968981869.stgit@warthog.procyon.org.uk/ # v3
Link: https://lore.kernel.org/r/163649325519.309189.15072332908703129455.stgit@warthog.procyon.org.uk/ # v4
---
include/linux/pagemap.h | 14 ++++++++++++++
mm/page-writeback.c | 2 +-
2 files changed, 15 insertions(+), 1 deletion(-)
diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h
index 1f560aecd9b5..1a0c646eb6ff 100644
--- a/include/linux/pagemap.h
+++ b/include/linux/pagemap.h
@@ -253,6 +253,20 @@ static inline struct address_space *page_mapping_file(struct page *page)
return folio_mapping(folio);
}
+/**
+ * folio_inode - Get the host inode for this folio.
+ * @folio: The folio.
+ *
+ * For folios which are in the page cache, return the inode that this folio
+ * belongs to.
+ *
+ * Do not call this for folios which aren't in the page cache.
+ */
+static inline struct inode *folio_inode(struct folio *folio)
+{
+ return folio->mapping->host;
+}
+
static inline bool page_cache_add_speculative(struct page *page, int count)
{
VM_BUG_ON_PAGE(PageTail(page), page);
diff --git a/mm/page-writeback.c b/mm/page-writeback.c
index 2d498bb62248..a613f8ef6a02 100644
--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c
@@ -2967,7 +2967,7 @@ EXPORT_SYMBOL_GPL(folio_wait_writeback_killable);
*/
void folio_wait_stable(struct folio *folio)
{
- if (folio->mapping->host->i_sb->s_iflags & SB_I_STABLE_WRITES)
+ if (folio_inode(folio)->i_sb->s_iflags & SB_I_STABLE_WRITES)
folio_wait_writeback(folio);
}
EXPORT_SYMBOL_GPL(folio_wait_stable);
next prev parent reply other threads:[~2021-11-10 21:08 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-11-10 21:07 [PATCH v5 0/4] netfs, 9p, afs, ceph: Support folios, at least partially David Howells
2021-11-10 21:08 ` [PATCH v5 1/4] folio: Add a function to change the private data attached to a folio David Howells
2021-11-10 21:08 ` David Howells [this message]
2021-11-10 21:08 ` [PATCH v5 3/4] netfs, 9p, afs, ceph: Use folios David Howells
2021-11-10 21:09 ` [PATCH v5 4/4] afs: Use folios in directory handling David Howells
2021-11-11 14:28 ` [PATCH v5 0/4] netfs, 9p, afs, ceph: Support folios, at least partially Dominique Martinet
[not found] ` <MDAEMON-F202111101609.AA0938215md5001000000902@sequoia-grove.ad.secure-endpoints.com>
2021-11-11 15:45 ` [kafs-testing] [PATCH v5 4/4] afs: Use folios in directory handling Jeffrey E Altman
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