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authorNamjae Jeon <namjae.jeon@samsung.com>2016-01-20 23:59:49 +0100
committerLinus Torvalds <torvalds@linux-foundation.org>2016-01-21 02:09:18 +0100
commit28016128d37a46d89ac5d9a450709284148989d6 (patch)
tree93a54c3808f09d9ec7b74bbde0a32236440f8389 /Documentation/filesystems/vfat.txt
parentfat: permit to return phy block number by fibmap in fallocated region (diff)
downloadlinux-28016128d37a46d89ac5d9a450709284148989d6.tar.xz
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Documentation/filesystems/vfat.txt: update the limitation for fat fallocate
Update the limitation for fat fallocate. Signed-off-by: Namjae Jeon <namjae.jeon@samsung.com> Signed-off-by: Amit Sahrawat <a.sahrawat@samsung.com> Cc: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'Documentation/filesystems/vfat.txt')
-rw-r--r--Documentation/filesystems/vfat.txt10
1 files changed, 10 insertions, 0 deletions
diff --git a/Documentation/filesystems/vfat.txt b/Documentation/filesystems/vfat.txt
index ce1126aceed8..223c32171dcc 100644
--- a/Documentation/filesystems/vfat.txt
+++ b/Documentation/filesystems/vfat.txt
@@ -180,6 +180,16 @@ dos1xfloppy -- If set, use a fallback default BIOS Parameter Block
<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