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Documentation/filesystems/vfat.txt: update the limitation for fat fallocate

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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>
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Namjae Jeon 2016-01-20 14:59:49 -08:00 committed by Linus Torvalds
parent 16fab20150
commit 28016128d3
1 changed files with 10 additions and 0 deletions
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Documentation/filesystems/vfat.txt
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@ -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
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* Need to get rid of the raw scanning stuff. Instead, always use