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Initial, incomplete, support for extended attributes. Extended
attributes are implemented fairly naively, using a second table
in the file database using the primary file table's id as a
foreign key. The ON DELETE CASCADE behavior requires sqlite 3.6.19
or later with foreign key and trigger support compiled in.
To reduce round-trips, the client does not check for existing
attributes, but rather, sends three distinct set messages;
OP_SET_XATTR, OP_CREATE_XATTR, OP_REPLACE_XATTR. A SET message
always succeeds, a CREATE fails if the attribute already
exists, and a REPLACE fails if the attribute does not already
exist.
The /* flags */ feature of makewrappers is used to correct
path names appropriately, so all functions are already working
with complete paths, and can always use functions that work
on links; if they were supposed to dereference, the path
fixup code got that.
The xattr support is enabled, for now, conditional on
whether getfattr --help succeeds.
Not yet implemented: Translation for system.posix_acl_access,
which is used by "cp -a" (or "cp --preserve-all") on some
systems to try to copy modes.
Signed-off-by: Peter Seebach <peter.seebach@windriver.com>
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The PSEUDO_STATBUF change (allowing operations on files over
2GB even on 32-bit systems) introduced a subtle bug; by calling
stat64() rather than real_stat(), pseudo stopped handling
chrooted paths well. In most cases, this was fine, but in the
specific case of a rename, where the stat buffers for the various
parts were actually used, it wasn't. Of particular note, pseudo
could end up creating links which had stack garbage for their
stat buffs, because it assumed that if the rename operation
succeeded, the stat operations must have succeeded.
Of course, there is no real_stat64 in the Linux port, because
there's no need for it; most code is calling __xstat64 or some
relative thereof, and even if you did really call stat64, it'd
end up routed there anyway. So we add that so that it can be
used for calls and we don't have to encode Linux-specific
magic about __xstat into the generic header.
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This is a spiffied-up rebase of a bunch of intermediate changes, presented
as a whole because it is, surprisingly, less confusing that way. The basic
idea is to separate the guts code into categories ranging from generic
stuff that can be the same everywhere and specific variants. The big scary
one is the Darwin support, which actually seems to run okay on 64-bit OS X
10.6. (No other variants were tested.) The other example given is support
for the old clone() syscall on RHEL 4, which affects some wrlinux use cases.
There's a few minor cleanup bits here, such as a function with inconsistent
calling conventions, but nothing really exciting.
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Peter Seebach