/* * Cache operations for Coda. * For Linux 2.1: (C) 1997 Carnegie Mellon University * For Linux 2.3: (C) 2000 Carnegie Mellon University * * Carnegie Mellon encourages users of this code to contribute improvements * to the Coda project http://www.coda.cs.cmu.edu/ . */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include "coda_linux.h" #include "coda_cache.h" static atomic_t permission_epoch = ATOMIC_INIT(0); /* replace or extend an acl cache hit */ void coda_cache_enter(struct inode *inode, int mask) { struct coda_inode_info *cii = ITOC(inode); spin_lock(&cii->c_lock); cii->c_cached_epoch = atomic_read(&permission_epoch); if (!uid_eq(cii->c_uid, current_fsuid())) { cii->c_uid = current_fsuid(); cii->c_cached_perm = mask; } else cii->c_cached_perm |= mask; spin_unlock(&cii->c_lock); } /* remove cached acl from an inode */ void coda_cache_clear_inode(struct inode *inode) { struct coda_inode_info *cii = ITOC(inode); spin_lock(&cii->c_lock); cii->c_cached_epoch = atomic_read(&permission_epoch) - 1; spin_unlock(&cii->c_lock); } /* remove all acl caches */ void coda_cache_clear_all(struct super_block *sb) { atomic_inc(&permission_epoch); } /* check if the mask has been matched against the acl already */ int coda_cache_check(struct inode *inode, int mask) { struct coda_inode_info *cii = ITOC(inode); int hit; spin_lock(&cii->c_lock); hit = (mask & cii->c_cached_perm) == mask && uid_eq(cii->c_uid, current_fsuid()) && cii->c_cached_epoch == atomic_read(&permission_epoch); spin_unlock(&cii->c_lock); return hit; } /* Purging dentries and children */ /* The following routines drop dentries which are not in use and flag dentries which are in use to be zapped later. The flags are detected by: - coda_dentry_revalidate (for lookups) if the flag is C_PURGE - coda_dentry_delete: to remove dentry from the cache when d_count falls to zero - an inode method coda_revalidate (for attributes) if the flag is C_VATTR */ /* this won't do any harm: just flag all children */ static void coda_flag_children(struct dentry *parent, int flag) { struct dentry *de; spin_lock(&parent->d_lock); list_for_each_entry(de, &parent->d_subdirs, d_child) { /* don't know what to do with negative dentries */ if (d_inode(de) ) coda_flag_inode(d_inode(de), flag); } spin_unlock(&parent->d_lock); return; } void coda_flag_inode_children(struct inode *inode, int flag) { struct dentry *alias_de; if ( !inode || !S_ISDIR(inode->i_mode)) return; alias_de = d_find_alias(inode); if (!alias_de) return; coda_flag_children(alias_de, flag); shrink_dcache_parent(alias_de); dput(alias_de); } 8'>8space:mode:

author	Julian Anastasov <ja@ssi.bg>	2017-02-06 23:14:16 +0200
committer	David S. Miller <davem@davemloft.net>	2017-02-07 13:07:47 -0500
commit	0dec879f636f11b0ffda1cb5fd96a1754c59ead3 (patch)
tree	fcc479052e78ceb30f8f3b95a881cf986f0564dd
parent	63fca65d08632fbec9d9b655f671cf08aa1aeeb8 (diff)

net: use dst_confirm_neigh for UDP, RAW, ICMP, L2TP

When same struct dst_entry can be used for many different neighbours we can not use it for pending confirmations. The datagram protocols can use MSG_CONFIRM to confirm the neighbour. When used with MSG_PROBE we do not reach the code where neighbour is confirmed, so we have to do the same slow lookup by using the dst_confirm_neigh() helper. When MSG_PROBE is not used, ip_append_data/ip6_append_data will set the skb flag dst_pending_confirm. Reported-by: YueHaibing <yuehaibing@huawei.com> Fixes: 5110effee8fd ("net: Do delayed neigh confirmation.") Fixes: f2bb4bedf35d ("ipv4: Cache output routes in fib_info nexthops.") Signed-off-by: Julian Anastasov <ja@ssi.bg> Acked-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>

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net/ipv6/ip6_output.c

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