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authorAl Viro <viro@zeniv.linux.org.uk>2019-03-16 05:23:19 +0300
committerAl Viro <viro@zeniv.linux.org.uk>2019-04-10 02:18:04 +0300
commit5467a68cbf6884c9a9d91e2a89140afb1839c835 (patch)
tree06501c271a2d4140c50b3643a64e30086170f134 /include/linux/dcache.h
parent9419a3191dcb27f24478d288abaab697228d28e6 (diff)
downloadlinux-5467a68cbf6884c9a9d91e2a89140afb1839c835.tar.xz
dcache: sort the freeing-without-RCU-delay mess for good.
For lockless accesses to dentries we don't have pinned we rely (among other things) upon having an RCU delay between dropping the last reference and actually freeing the memory. On the other hand, for things like pipes and sockets we neither do that kind of lockless access, nor want to deal with the overhead of an RCU delay every time a socket gets closed. So delay was made optional - setting DCACHE_RCUACCESS in ->d_flags made sure it would happen. We tried to avoid setting it unless we knew we need it. Unfortunately, that had led to recurring class of bugs, in which we missed the need to set it. We only really need it for dentries that are created by d_alloc_pseudo(), so let's not bother with trying to be smart - just make having an RCU delay the default. The ones that do *not* get it set the replacement flag (DCACHE_NORCU) and we'd better use that sparingly. d_alloc_pseudo() is the only such user right now. FWIW, the race that finally prompted that switch had been between __lock_parent() of immediate subdirectory of what's currently the root of a disconnected tree (e.g. from open-by-handle in progress) racing with d_splice_alias() elsewhere picking another alias for the same inode, either on outright corrupted fs image, or (in case of open-by-handle on NFS) that subdirectory having been just moved on server. It's not easy to hit, so the sky is not falling, but that's not the first race on similar missed cases and the logics for settinf DCACHE_RCUACCESS has gotten ridiculously convoluted. Cc: stable@vger.kernel.org Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'include/linux/dcache.h')
-rw-r--r--include/linux/dcache.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/include/linux/dcache.h b/include/linux/dcache.h
index 60996e64c579..6e1e8e6602c6 100644
--- a/include/linux/dcache.h
+++ b/include/linux/dcache.h
@@ -176,7 +176,6 @@ struct dentry_operations {
* typically using d_splice_alias. */
#define DCACHE_REFERENCED 0x00000040 /* Recently used, don't discard. */
-#define DCACHE_RCUACCESS 0x00000080 /* Entry has ever been RCU-visible */
#define DCACHE_CANT_MOUNT 0x00000100
#define DCACHE_GENOCIDE 0x00000200
@@ -217,6 +216,7 @@ struct dentry_operations {
#define DCACHE_PAR_LOOKUP 0x10000000 /* being looked up (with parent locked shared) */
#define DCACHE_DENTRY_CURSOR 0x20000000
+#define DCACHE_NORCU 0x40000000 /* No RCU delay for freeing */
extern seqlock_t rename_lock;