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b98f85d480
freebsd-skq/sys
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avg b98f85d480 fix l2arc compression buffers leak 
We have observed that arc_release() can be called concurrently with a
l2arc in-flight write.
Also, we have observed that arc_hdr_destroy() can be called from
arc_write_done() for a zio with ZIO_FLAG_IO_REWRITE flag in similar
circumstances.

Previously the l2arc headers would be freed while leaking their
associated compression buffers.  Now the buffers are placed on
l2arc_free_on_write list for delayed freeing.  This is similar to what
was already done to arc buffers that were supposed to be freed
concurrently with in-flight writes of those buffers.

In addition to fixing the discovered leaks this change also adds some
protective code to assert that a compression buffer associated with a
l2arc header is never leaked.

A new kstat l2_cdata_free_on_write is added.  It keeps a count of
delayed compression buffer frees which previously would have been leaks.

Tested by:	Vitalij Satanivskij <satan@ukr.net> et al
Requested by:	many
MFC after:	2 weeks
Sponsored by:	HybridCluster / ClusterHQ
2014-11-06 11:08:02 +00:00
..
amd64 Add support for netmap in GENERIC by default. 2014-11-05 06:22:37 +00:00
arm Fix usage of kern_getenv(). 2014-10-31 15:07:51 +00:00
boot In alloc_pread() and kern_pread(), print errors only when DEBUG is 2014-11-05 04:18:41 +00:00
bsm
cam Add to CTL support for logical block provisioning threshold notifications. 2014-11-06 00:48:36 +00:00
cddl fix l2arc compression buffers leak 2014-11-06 11:08:02 +00:00
compat Replace some calls to fuword() by fueword() with proper error checking. 2014-10-28 15:28:20 +00:00
conf Add VirtIO console to the x86 NOTES and files 2014-11-03 22:37:10 +00:00
contrib krping: In verbose mode print only first 128 bytes of krping data. 2014-10-27 22:41:55 +00:00
crypto Put the aesni_cipher_setup() and aesni_cipher_process() functions into 2014-06-24 06:55:49 +00:00
ddb ddb: ANSI-fy function declarations. 2014-10-12 18:01:52 +00:00
dev vt(4): Support syscons' SC_HISTORY_SIZE to configure history size 2014-11-04 23:51:35 +00:00
fs Fix up some session-related races in devfs. 2014-11-03 03:12:15 +00:00
gdb Add support for gdb's memory searching capabilities to our in-kernel gdb 2014-09-05 16:40:47 +00:00
geom Add to CTL support for logical block provisioning threshold notifications. 2014-11-06 00:48:36 +00:00
gnu reiserfs: Use signed i_nlink 2014-09-25 19:10:32 +00:00
i386 Add VirtIO console to the x86 NOTES and files 2014-11-03 22:37:10 +00:00
isa
kern Add sysctl kern.proc.cwd 2014-11-06 08:12:34 +00:00
kgssapi Avoid dynamic syscall overhead for statically compiled modules. 2014-10-26 19:42:44 +00:00
libkern Add a complete implementation of MurmurHash3. Tweak both implementations 2014-10-18 22:15:11 +00:00
mips Use search method instead of fixed offsets for finding rootfs. This unbreaks 2014-10-30 23:47:28 +00:00
modules Remove duplicate macro settings (probably due to an SVN merge /faux pas/ on my part. 2014-11-01 17:52:04 +00:00
net Clarify TSO segment limit comment and remove two TABs to make lines a 2014-11-03 13:02:58 +00:00
net80211 Fix multiple incorrect SYSCTL arguments in the kernel: 2014-10-21 07:31:21 +00:00
netgraph NG_NODE_NAME(node) is always not NULL. Use correct macro. 2014-11-02 05:51:31 +00:00
netinet Remove old hack abusing domattach from NFS code. 2014-11-05 00:58:01 +00:00
netinet6 Remove old hack abusing domattach from NFS code. 2014-11-05 00:58:01 +00:00
netipsec Use in_localip() instead of handmade implementation. 2014-10-31 12:19:22 +00:00
netnatm
netpfil Remove unused variable. 2014-11-04 10:25:52 +00:00
netsmb
nfs Avoid dynamic syscall overhead for statically compiled modules. 2014-10-26 19:42:44 +00:00
nfsclient Follow up to r225617. In order to maximize the re-usability of kernel code 2014-10-16 18:04:43 +00:00
nfsserver Change NFS readdir() to only ignore cookies preceding the given offset for 2014-07-01 20:00:35 +00:00
nlm Avoid dynamic syscall overhead for statically compiled modules. 2014-10-26 19:42:44 +00:00
ofed Fix compile warning by removing unused variable. 2014-10-30 16:57:56 +00:00
opencrypto Fix build for kernels without COMPAT_FREEBSD32. 2014-09-22 17:32:27 +00:00
pc98 Add COMPAT_FREEBSD9 and COMPAT_FREEBSD10 options to wrap code that 2014-10-24 19:58:24 +00:00
powerpc Add type qualifier volatile to the base (userspace) address argument 2014-10-31 17:43:21 +00:00
rpc Merge the NFSv4.1 server code in projects/nfsv4.1-server over 2014-07-01 20:47:16 +00:00
security Replace dev_clone with cdevpriv(9) KPI in audit_pipe code. 2014-08-20 16:04:30 +00:00
sparc64 Add fueword(9) and casueword(9) functions. They are like fuword(9) 2014-10-28 15:22:13 +00:00
sys Add sysctl kern.proc.cwd 2014-11-06 08:12:34 +00:00
teken
tools Allow the make_dtb script to work outside of a "make buildkernel" context 2014-08-30 22:39:15 +00:00
ufs When non-forced unmount or remount rw->ro is performed, writes on UFS 2014-11-02 13:14:55 +00:00
vm Fix mis-spelling of bits and types names in the 2014-11-04 19:56:04 +00:00
x86 MFamd64: Add support for extended FPU states on i386. This includes 2014-11-02 22:58:30 +00:00
xdr
xen xen: implement the privcmd user-space device 2014-10-22 17:07:20 +00:00
Makefile Remove "pci" from CSCOPEDIRS. 2014-09-23 06:32:19 +00:00