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authorEvgeniy Dushistov <dushistov@mail.ru>2006-08-27 01:23:46 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2006-08-27 11:01:31 -0700
commitecdc63948763586e101108dfe1ba316ec069fe39 (patch)
treea127e8fef9ce30007a357cff51f092ab500f8e7f /Documentation/filesystems
parentc37336b078ba9d2ff38c535b194996a7ad6e69f8 (diff)
[PATCH] ufs: truncate correction
1) When we allocated last fragment in ufs_truncate, we read page, check if block mapped to address, and if not trying to allocate it. This is wrong behaviour, fragment may be NOT allocated, but mapped, this happened because of "block map" function not checked allocated fragment or not, it just take address of the first fragment in the block, add offset of fragment and return result, this is correct behaviour in almost all situation except call from ufs_truncate. 2) Almost all implementation of UFS, which I can investigate have such "defect": if you have full disk, and try truncate file, for example 3GB to 2MB, and have hole in this region, truncate return -ENOSPC. I tried evade from this problem, but "block allocation" algorithm is tied to right value of i_lastfrag, and fix of this corner case may slow down of ordinaries scenarios, so this patch makes behavior of "truncate" operations similar to what other UFS implementations do. Signed-off-by: Evgeniy Dushistov <dushistov@mail.ru> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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