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ec96ea690e
tdb transactions were designed to be robust against the machine powering off, but interestingly were never designed to handle the case where an administrator kill -9's a process during commit. Because recovery is only done on tdb_open, processes with the tdb already mapped will simply use it despite it being corrupt and needing recovery. The solution to this is to check for recovery every time we grab a data lock: we could have gained the lock because a process just died. This has no measurable cost: here is the time for tdbtorture -s 0 -n 1 -l 10000: Before: 2.75 2.50 2.81 3.19 2.91 2.53 2.72 2.50 2.78 2.77 = Avg 2.75 After: 2.81 2.57 3.42 2.49 3.02 2.49 2.84 2.48 2.80 2.43 = Avg 2.74 Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
compression - Various compression algorithms (MSZIP, lzxpress)
nss_wrapper - Wrapper for the user and group NSS API allowing the use
of other data sources.
popt - Command-line option parsing library
replace - Provides replacements for standard (POSIX, C99) functions
not provided by the host platform.
socket_wrapper - Wrapper library allowing TCP/IP traffic to be redirected
over Unix domain sockets.
talloc - Hierarchical pool based memory allocator
tdb - Simple but fast key/value database library, supporting multiple writers
torture - Simple unit testing helper library