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SubjectRe: Proposal: restrict link(2)
Date

Steve VanDevender was overheard whispering ...
#
#
# Harald Koenig writes:
# > * clobber other user's disk quoatas, disk usage and disk space accounting etc.
#
# No.
#
# $ mkdir tmp; cd tmp
# $ dd if=/dev/zero of=foo bs=1024 count=1024
# 1024+0 records in
# 1024+0 records out
# $ du
# 1030 .
# $ ln foo bar
# $ du
# 1030 .
# $ rm foo
# $ du
# 1030 .
#
# You have only a cursory understanding of how hard links work.
#

Your example doesn't demostrate that if:

user1 $ dd if=/dev/zero of=foo bs=1k count=1k
# repquota -a | grep user1
user1 -- 1029 0 0 1 0 0
user2 $ ln ~user1/foo ~/bar
user1 $ rm foo
# repquota -a | grep user1
user1 -- 1029 0 0 1 0 0

at this point the quota's for user1 still show the usage, as they
should considering the blocks are still allocated. So user2 could fill
user1's quotas by hard linking foo as many times as needed.

N!
------------------------------------------------------------------------------
Nicholas J. Leon nicholas@binary9.net
"Elegance through Simplicity" http://www.binary9.net/nicholas

SF/F Reading Suggestion #3: Magic of Recluse by L.E. Modesitt, Jr.


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