tree d3678ad2cbfb41624af0058b7de1ee2d48b7334c
parent b028fcfc4cd198a6aa1ffcfb872073ccc1db3459
author Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp> 1239069708 -0700
committer Linus Torvalds <torvalds@linux-foundation.org> 1239118277 -0700

nilfs2: fix improper return values of nilfs_get_cpinfo ioctl

A few tool developers gave me requests for fixing inconvenient return
value of nilfs_get_cpinfo() ioctl; if the requested mode is NILFS_SNAPSHOT
and the specified start entry is not a snapshot, the ioctl unnaturally
returns one as the number of acquired snapshot item.

In addition, the ioctl function returns an ENOENT error for checkpoints
within blocks deleted by garbage collection.

These behaviors require corrections for programs which enumerate
snapshots.  This resolves the inconvenience by changing the return values
to zero for the above cases.

Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>