diff options
| -rw-r--r-- | fs/cifs/connect.c | 35 | ||||
| -rw-r--r-- | fs/cifs/dfs_cache.c | 33 |
2 files changed, 51 insertions, 17 deletions
diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c index 1a6d6e1e2c71..b2447cea45ae 100644 --- a/fs/cifs/connect.c +++ b/fs/cifs/connect.c @@ -3333,6 +3333,33 @@ out: return rc; } +/* Check if resolved targets can handle any DFS referrals */ +static int is_referral_server(const char *ref_path, struct cifs_tcon *tcon, bool *ref_server) +{ + int rc; + struct dfs_info3_param ref = {0}; + + if (is_tcon_dfs(tcon)) { + *ref_server = true; + } else { + cifs_dbg(FYI, "%s: ref_path=%s\n", __func__, ref_path); + + rc = dfs_cache_noreq_find(ref_path, &ref, NULL); + if (rc) { + cifs_dbg(VFS, "%s: dfs_cache_noreq_find: failed (rc=%d)\n", __func__, rc); + return rc; + } + cifs_dbg(FYI, "%s: ref.flags=0x%x\n", __func__, ref.flags); + /* + * Check if all targets are capable of handling DFS referrals as per + * MS-DFSC 2.2.4 RESP_GET_DFS_REFERRAL. + */ + *ref_server = !!(ref.flags & DFSREF_REFERRAL_SERVER); + free_dfs_info_param(&ref); + } + return 0; +} + int cifs_mount(struct cifs_sb_info *cifs_sb, struct smb3_fs_context *ctx) { int rc = 0; @@ -3344,6 +3371,7 @@ int cifs_mount(struct cifs_sb_info *cifs_sb, struct smb3_fs_context *ctx) char *ref_path = NULL, *full_path = NULL; char *oldmnt = NULL; char *mntdata = NULL; + bool ref_server = false; rc = mount_get_conns(ctx, cifs_sb, &xid, &server, &ses, &tcon); /* @@ -3409,11 +3437,16 @@ int cifs_mount(struct cifs_sb_info *cifs_sb, struct smb3_fs_context *ctx) break; if (!tcon) continue; + /* Make sure that requests go through new root servers */ - if (is_tcon_dfs(tcon)) { + rc = is_referral_server(ref_path + 1, tcon, &ref_server); + if (rc) + break; + if (ref_server) { put_root_ses(root_ses); set_root_ses(cifs_sb, ses, &root_ses); } + /* Get next dfs path and then continue chasing them if -EREMOTE */ rc = next_dfs_prepath(cifs_sb, ctx, xid, server, tcon, &ref_path); /* Prevent recursion on broken link referrals */ diff --git a/fs/cifs/dfs_cache.c b/fs/cifs/dfs_cache.c index 4950ab0486ae..098b4bc8da59 100644 --- a/fs/cifs/dfs_cache.c +++ b/fs/cifs/dfs_cache.c @@ -37,11 +37,12 @@ struct cache_dfs_tgt { struct cache_entry { struct hlist_node hlist; const char *path; - int ttl; - int srvtype; - int flags; + int hdr_flags; /* RESP_GET_DFS_REFERRAL.ReferralHeaderFlags */ + int ttl; /* DFS_REREFERRAL_V3.TimeToLive */ + int srvtype; /* DFS_REREFERRAL_V3.ServerType */ + int ref_flags; /* DFS_REREFERRAL_V3.ReferralEntryFlags */ struct timespec64 etime; - int path_consumed; + int path_consumed; /* RESP_GET_DFS_REFERRAL.PathConsumed */ int numtgts; struct list_head tlist; struct cache_dfs_tgt *tgthint; @@ -166,14 +167,11 @@ static int dfscache_proc_show(struct seq_file *m, void *v) continue; seq_printf(m, - "cache entry: path=%s,type=%s,ttl=%d,etime=%ld," - "interlink=%s,path_consumed=%d,expired=%s\n", - ce->path, - ce->srvtype == DFS_TYPE_ROOT ? "root" : "link", - ce->ttl, ce->etime.tv_nsec, - IS_INTERLINK_SET(ce->flags) ? "yes" : "no", - ce->path_consumed, - cache_entry_expired(ce) ? "yes" : "no"); + "cache entry: path=%s,type=%s,ttl=%d,etime=%ld,hdr_flags=0x%x,ref_flags=0x%x,interlink=%s,path_consumed=%d,expired=%s\n", + ce->path, ce->srvtype == DFS_TYPE_ROOT ? "root" : "link", + ce->ttl, ce->etime.tv_nsec, ce->ref_flags, ce->hdr_flags, + IS_INTERLINK_SET(ce->hdr_flags) ? "yes" : "no", + ce->path_consumed, cache_entry_expired(ce) ? "yes" : "no"); list_for_each_entry(t, &ce->tlist, list) { seq_printf(m, " %s%s\n", @@ -236,11 +234,12 @@ static inline void dump_tgts(const struct cache_entry *ce) static inline void dump_ce(const struct cache_entry *ce) { - cifs_dbg(FYI, "cache entry: path=%s,type=%s,ttl=%d,etime=%ld,interlink=%s,path_consumed=%d,expired=%s\n", + cifs_dbg(FYI, "cache entry: path=%s,type=%s,ttl=%d,etime=%ld,hdr_flags=0x%x,ref_flags=0x%x,interlink=%s,path_consumed=%d,expired=%s\n", ce->path, ce->srvtype == DFS_TYPE_ROOT ? "root" : "link", ce->ttl, ce->etime.tv_nsec, - IS_INTERLINK_SET(ce->flags) ? "yes" : "no", + ce->hdr_flags, ce->ref_flags, + IS_INTERLINK_SET(ce->hdr_flags) ? "yes" : "no", ce->path_consumed, cache_entry_expired(ce) ? "yes" : "no"); dump_tgts(ce); @@ -381,7 +380,8 @@ static int copy_ref_data(const struct dfs_info3_param *refs, int numrefs, ce->ttl = refs[0].ttl; ce->etime = get_expire_time(ce->ttl); ce->srvtype = refs[0].server_type; - ce->flags = refs[0].ref_flag; + ce->hdr_flags = refs[0].flags; + ce->ref_flags = refs[0].ref_flag; ce->path_consumed = refs[0].path_consumed; for (i = 0; i < numrefs; i++) { @@ -799,7 +799,8 @@ static int setup_referral(const char *path, struct cache_entry *ce, ref->path_consumed = ce->path_consumed; ref->ttl = ce->ttl; ref->server_type = ce->srvtype; - ref->ref_flag = ce->flags; + ref->ref_flag = ce->ref_flags; + ref->flags = ce->hdr_flags; return 0; |