diff options
Diffstat (limited to 'fs/dcache.c')
| -rw-r--r-- | fs/dcache.c | 16 |
1 files changed, 14 insertions, 2 deletions
diff --git a/fs/dcache.c b/fs/dcache.c index 0f6b16ba30d0..0099077a2982 100644 --- a/fs/dcache.c +++ b/fs/dcache.c @@ -135,6 +135,7 @@ struct dentry_stat_t { static DEFINE_PER_CPU(long, nr_dentry); static DEFINE_PER_CPU(long, nr_dentry_unused); static DEFINE_PER_CPU(long, nr_dentry_negative); +static int dentry_negative_policy; #if defined(CONFIG_SYSCTL) && defined(CONFIG_PROC_FS) /* Statistics gathering. */ @@ -199,6 +200,15 @@ static struct ctl_table fs_dcache_sysctls[] = { .mode = 0444, .proc_handler = proc_nr_dentry, }, + { + .procname = "dentry-negative", + .data = &dentry_negative_policy, + .maxlen = sizeof(dentry_negative_policy), + .mode = 0644, + .proc_handler = proc_dointvec_minmax, + .extra1 = SYSCTL_ZERO, + .extra2 = SYSCTL_ONE, + }, }; static int __init init_fs_dcache_sysctls(void) @@ -2039,8 +2049,8 @@ EXPORT_SYMBOL(d_obtain_root); /** * d_add_ci - lookup or allocate new dentry with case-exact name - * @inode: the inode case-insensitive lookup has found * @dentry: the negative dentry that was passed to the parent's lookup func + * @inode: the inode case-insensitive lookup has found * @name: the case-exact name to be associated with the returned dentry * * This is to avoid filling the dcache with case-insensitive names to the @@ -2093,8 +2103,8 @@ EXPORT_SYMBOL(d_add_ci); /** * d_same_name - compare dentry name with case-exact name - * @parent: parent dentry * @dentry: the negative dentry that was passed to the parent's lookup func + * @parent: parent dentry * @name: the case-exact name to be associated with the returned dentry * * Return: true if names are same, or false @@ -2401,6 +2411,8 @@ void d_delete(struct dentry * dentry) * Are we the only user? */ if (dentry->d_lockref.count == 1) { + if (dentry_negative_policy) + __d_drop(dentry); dentry->d_flags &= ~DCACHE_CANT_MOUNT; dentry_unlink_inode(dentry); } else { |