tree d3d337e52516b3b61cdf4508cf445ef8dcaae2ed
parent 0e75f5da06c05425f4b375eb981c4489fb2d9787
author OGAWA Hirofumi <hirofumi@mail.parknet.co.jp> 1226004837 -0800
committer Linus Torvalds <torvalds@linux-foundation.org> 1226014881 -0800

fat: mmu_private race fix

mmu_private is 64bits value, hence it's not atomic to update.

So, the access rule for mmu_private is we must hold ->i_mutex.  But,
fat_get_block() path doesn't follow the rule on non-allocation path.

This fixes by using i_size instead if non-allocation path.

Signed-off-by: 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>