The patch titled
Subject: Documentation/filesystems/vfat.txt: update the limitation for fat fallocate
has been added to the -mm tree. Its filename is
documentation-filesystems-vfattxt-update-the-limitation-for-fat-fallocate.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/documentation-filesystems-vfattxt-update-the-limitation-for-fat-fallocate.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/documentation-filesystems-vfattxt-update-the-limitation-for-fat-fallocate.patch
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------------------------------------------------------
From: Namjae Jeon <namjae.jeon@xxxxxxxxxxx>
Subject: Documentation/filesystems/vfat.txt: update the limitation for fat fallocate
Update the limitation for fat fallocate.
Signed-off-by: Namjae Jeon <namjae.jeon@xxxxxxxxxxx>
Signed-off-by: Amit Sahrawat <a.sahrawat@xxxxxxxxxxx>
Cc: OGAWA Hirofumi <hirofumi@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
Documentation/filesystems/vfat.txt | 10 ++++++++++
1 file changed, 10 insertions(+)
diff -puN Documentation/filesystems/vfat.txt~documentation-filesystems-vfattxt-update-the-limitation-for-fat-fallocate Documentation/filesystems/vfat.txt
--- a/Documentation/filesystems/vfat.txt~documentation-filesystems-vfattxt-update-the-limitation-for-fat-fallocate
+++ a/Documentation/filesystems/vfat.txt
@@ -180,6 +180,16 @@ dos1xfloppy -- If set, use a fallback d
<bool>: 0,1,yes,no,true,false
+LIMITATION
+---------------------------------------------------------------------
+* The fallocated region of file is discarded at umount/evict time
+ when using fallocate with FALLOC_FL_KEEP_SIZE.
+ So, User should assume that fallocated region can be discarded at
+ last close if there is memory pressure resulting in eviction of
+ the inode from the memory. As a result, for any dependency on
+ the fallocated region, user should make sure to recheck fallocate
+ after reopening the file.
+
TODO
----------------------------------------------------------------------
* Need to get rid of the raw scanning stuff. Instead, always use
_
Patches currently in -mm which might be from namjae.jeon@xxxxxxxxxxx are
origin.patch
fat-add-fat_fallocate-operation.patch
fat-skip-cluster-allocation-on-fallocated-region.patch
fat-permit-to-return-phy-block-number-by-fibmap-in-fallocated-region.patch
documentation-filesystems-vfattxt-update-the-limitation-for-fat-fallocate.patch
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