[<prev] [next>] [thread-next>] [day] [month] [year] [list]
Message-Id: <20230103190259.30944-1-fmdefrancesco@gmail.com>
Date: Tue, 3 Jan 2023 20:02:59 +0100
From: "Fabio M. De Francesco" <fmdefrancesco@...il.com>
To: Tyler Hicks <code@...icks.com>,
"Matthew Wilcox (Oracle)" <willy@...radead.org>,
Christian Brauner <brauner@...nel.org>,
Damien Le Moal <damien.lemoal@...nsource.wdc.com>,
"Fabio M. De Francesco" <fmdefrancesco@...il.com>,
Al Viro <viro@...iv.linux.org.uk>,
Muchun Song <muchun.song@...ux.dev>, ecryptfs@...r.kernel.org,
linux-kernel@...r.kernel.org
Cc: Ira Weiny <ira.weiny@...el.com>
Subject: [PATCH] fs/ecryptfs: Replace kmap_atomic() with kmap_local_page()
kmap_atomic() is deprecated in favor of kmap_local_page(). Therefore,
replace kmap_atomic() with kmap_local_page() in ecryptfs_write().
kmap_atomic() is implemented like a kmap_local_page() which also disables
page-faults and preemption (the latter only for !PREEMPT_RT kernels).
The code within the mapping/un-mapping in ecryptfs_write() does not
depend on the above-mentioned side effects.
Therefore, a mere replacement of the old API with the new one is all that
is required (i.e., there is no need to explicitly add any calls to
pagefault_disable() and/or preempt_disable()).
Suggested-by: Ira Weiny <ira.weiny@...el.com>
Signed-off-by: Fabio M. De Francesco <fmdefrancesco@...il.com>
---
fs/ecryptfs/read_write.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/fs/ecryptfs/read_write.c b/fs/ecryptfs/read_write.c
index 5edf027c8359..3458f153a588 100644
--- a/fs/ecryptfs/read_write.c
+++ b/fs/ecryptfs/read_write.c
@@ -140,7 +140,7 @@ int ecryptfs_write(struct inode *ecryptfs_inode, char *data, loff_t offset,
ecryptfs_page_idx, rc);
goto out;
}
- ecryptfs_page_virt = kmap_atomic(ecryptfs_page);
+ ecryptfs_page_virt = kmap_local_page(ecryptfs_page);
/*
* pos: where we're now writing, offset: where the request was
@@ -163,7 +163,7 @@ int ecryptfs_write(struct inode *ecryptfs_inode, char *data, loff_t offset,
(data + data_offset), num_bytes);
data_offset += num_bytes;
}
- kunmap_atomic(ecryptfs_page_virt);
+ kunmap_local(ecryptfs_page_virt);
flush_dcache_page(ecryptfs_page);
SetPageUptodate(ecryptfs_page);
unlock_page(ecryptfs_page);
--
2.39.0
Powered by blists - more mailing lists