diff options
Diffstat (limited to 'fs/smb/client/cifsfs.c')
| -rw-r--r-- | fs/smb/client/cifsfs.c | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/fs/smb/client/cifsfs.c b/fs/smb/client/cifsfs.c index dcb39d1b5958..1775c2b7528f 100644 --- a/fs/smb/client/cifsfs.c +++ b/fs/smb/client/cifsfs.c @@ -121,6 +121,46 @@ unsigned int dir_cache_timeout = 30; module_param(dir_cache_timeout, uint, 0644); MODULE_PARM_DESC(dir_cache_timeout, "Number of seconds to cache directory contents for which we have a lease. Default: 30 " "Range: 1 to 65000 seconds, 0 to disable caching dir contents"); +/* Module-wide total cached dirents (in bytes) across all tcons */ +atomic64_t cifs_dircache_bytes_used = ATOMIC64_INIT(0); + +/* + * Write-only module parameter to drop all cached directory entries across + * all CIFS mounts. Echo a non-zero value to trigger. + */ +static void cifs_drop_all_dir_caches(void) +{ + struct TCP_Server_Info *server; + struct cifs_ses *ses; + struct cifs_tcon *tcon; + + spin_lock(&cifs_tcp_ses_lock); + list_for_each_entry(server, &cifs_tcp_ses_list, tcp_ses_list) { + list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) { + if (cifs_ses_exiting(ses)) + continue; + list_for_each_entry(tcon, &ses->tcon_list, tcon_list) + invalidate_all_cached_dirs(tcon); + } + } + spin_unlock(&cifs_tcp_ses_lock); +} + +static int cifs_param_set_drop_dir_cache(const char *val, const struct kernel_param *kp) +{ + bool bv; + int rc = kstrtobool(val, &bv); + + if (rc) + return rc; + if (bv) + cifs_drop_all_dir_caches(); + return 0; +} + +module_param_call(drop_dir_cache, cifs_param_set_drop_dir_cache, NULL, NULL, 0200); +MODULE_PARM_DESC(drop_dir_cache, "Write 1 to drop all cached directory entries across all CIFS mounts"); + #ifdef CONFIG_CIFS_STATS2 unsigned int slow_rsp_threshold = 1; module_param(slow_rsp_threshold, uint, 0644); |