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authorChristoph Hellwig <hch@lst.de>2016-06-21 09:23:11 +1000
committerDave Chinner <david@fromorbit.com>2016-06-21 09:23:11 +1000
commitae259a9c8593f98aa60d045df978a5482a67c53f (patch)
treea3c07fa9fb8c61475ff85f4d8812d83c287258ff /fs/Kconfig
parent199a31c6d93ba9dc6f831fa1e77d9926f34f4e8a (diff)
downloadop-kernel-dev-ae259a9c8593f98aa60d045df978a5482a67c53f.zip
op-kernel-dev-ae259a9c8593f98aa60d045df978a5482a67c53f.tar.gz
fs: introduce iomap infrastructure
Add infrastructure for multipage buffered writes. This is implemented using an main iterator that applies an actor function to a range that can be written. This infrastucture is used to implement a buffered write helper, one to zero file ranges and one to implement the ->page_mkwrite VM operations. All of them borrow a fair amount of code from fs/buffers. for now by using an internal version of __block_write_begin that gets passed an iomap and builds the corresponding buffer head. The file system is gets a set of paired ->iomap_begin and ->iomap_end calls which allow it to map/reserve a range and get a notification once the write code is finished with it. Based on earlier code from Dave Chinner. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Bob Peterson <rpeterso@redhat.com> Signed-off-by: Dave Chinner <david@fromorbit.com>
Diffstat (limited to 'fs/Kconfig')
-rw-r--r--fs/Kconfig3
1 files changed, 3 insertions, 0 deletions
diff --git a/fs/Kconfig b/fs/Kconfig
index b8fcb41..4524916 100644
--- a/fs/Kconfig
+++ b/fs/Kconfig
@@ -10,6 +10,9 @@ config DCACHE_WORD_ACCESS
if BLOCK
+config FS_IOMAP
+ bool
+
source "fs/ext2/Kconfig"
source "fs/ext4/Kconfig"
source "fs/jbd2/Kconfig"
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