On Wed, 2010-08-04 at 09:06 +0100, Kleen, Andi wrote: > > > I believe the latest version of Nick's patchkit has a likely fix for > > that. > > > > > > http://git.kernel.org/?p=linux/kernel/git/npiggin/linux- > > npiggin.git;a=commitdiff;h=9edd35f9aeafc8a5e1688b84cf4488a94898ca45 > > > > Thanks Andi. The patch has no ext3 part. > > Good point. But perhaps the ext2 patch can be adapted. The ACL code > should be similar in ext2 and ext3 (and 4) I ported ext2 part to ext3. aim7 testing on Nehalem EX 4 socket machine shows the regression disappears. --- diff -Nraup linux-2.6.35-rc5_nick/fs/ext3/acl.c linux-2.6.35-rc5_npymz/fs/ext3/acl.c --- linux-2.6.35-rc5_nick/fs/ext3/acl.c 2010-08-05 16:23:19.000000000 +0800 +++ linux-2.6.35-rc5_npymz/fs/ext3/acl.c 2010-08-05 15:47:38.000000000 +0800 @@ -240,13 +240,21 @@ ext3_set_acl(handle_t *handle, struct in } int -ext3_check_acl(struct inode *inode, int mask) +ext3_check_acl_rcu(struct inode *inode, int mask, unsigned int flags) { - struct posix_acl *acl = ext3_get_acl(inode, ACL_TYPE_ACCESS); + struct posix_acl *acl; - if (IS_ERR(acl)) - return PTR_ERR(acl); - if (acl) { + if (flags & IPERM_FLAG_RCU) { + if (!negative_cached_acl(inode, ACL_TYPE_ACCESS)) + return -ECHILD; + return -EAGAIN; + } + + acl = ext3_get_acl(inode, ACL_TYPE_ACCESS); + if (IS_ERR(acl)) + return PTR_ERR(acl); + + if (acl) { int error = posix_acl_permission(inode, acl, mask); posix_acl_release(acl); return error; diff -Nraup linux-2.6.35-rc5_nick/fs/ext3/acl.h linux-2.6.35-rc5_npymz/fs/ext3/acl.h --- linux-2.6.35-rc5_nick/fs/ext3/acl.h 2010-08-05 16:23:19.000000000 +0800 +++ linux-2.6.35-rc5_npymz/fs/ext3/acl.h 2010-08-05 15:48:51.000000000 +0800 @@ -54,7 +54,7 @@ static inline int ext3_acl_count(size_t #ifdef CONFIG_EXT3_FS_POSIX_ACL /* acl.c */ -extern int ext3_check_acl (struct inode *, int); +extern int ext3_check_acl_rcu(struct inode *inode, int mask, unsigned int flags); extern int ext3_acl_chmod (struct inode *); extern int ext3_init_acl (handle_t *, struct inode *, struct inode *); diff -Nraup linux-2.6.35-rc5_nick/fs/ext3/file.c linux-2.6.35-rc5_npymz/fs/ext3/file.c --- linux-2.6.35-rc5_nick/fs/ext3/file.c 2010-08-05 16:23:19.000000000 +0800 +++ linux-2.6.35-rc5_npymz/fs/ext3/file.c 2010-08-05 15:52:39.000000000 +0800 @@ -79,7 +79,7 @@ const struct inode_operations ext3_file_ .listxattr = ext3_listxattr, .removexattr = generic_removexattr, #endif - .check_acl = ext3_check_acl, + .check_acl_rcu = ext3_check_acl_rcu, .fiemap = ext3_fiemap, }; diff -Nraup linux-2.6.35-rc5_nick/fs/ext3/namei.c linux-2.6.35-rc5_npymz/fs/ext3/namei.c --- linux-2.6.35-rc5_nick/fs/ext3/namei.c 2010-08-05 16:25:08.000000000 +0800 +++ linux-2.6.35-rc5_npymz/fs/ext3/namei.c 2010-08-05 16:01:47.000000000 +0800 @@ -2465,7 +2465,7 @@ const struct inode_operations ext3_dir_i .listxattr = ext3_listxattr, .removexattr = generic_removexattr, #endif - .check_acl = ext3_check_acl, + .check_acl_rcu = ext3_check_acl_rcu, }; const struct inode_operations ext3_special_inode_operations = { @@ -2476,5 +2476,5 @@ const struct inode_operations ext3_speci .listxattr = ext3_listxattr, .removexattr = generic_removexattr, #endif - .check_acl = ext3_check_acl, + .check_acl_rcu = ext3_check_acl_rcu, }; -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxxx For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>