From b4868b44c5628995fdd8ef2e24dda73cef963a75 Mon Sep 17 00:00:00 2001 From: Benjamin Coddington Date: Fri, 25 Sep 2020 15:48:39 -0400 Subject: NFSv4: Wait for stateid updates after CLOSE/OPEN_DOWNGRADE Since commit 0e0cb35b417f ("NFSv4: Handle NFS4ERR_OLD_STATEID in CLOSE/OPEN_DOWNGRADE") the following livelock may occur if a CLOSE races with the update of the nfs_state: Process 1 Process 2 Server ========= ========= ======== OPEN file OPEN file Reply OPEN (1) Reply OPEN (2) Update state (1) CLOSE file (1) Reply OLD_STATEID (1) CLOSE file (2) Reply CLOSE (-1) Update state (2) wait for state change OPEN file wake CLOSE file OPEN file wake CLOSE file ... ... We can avoid this situation by not issuing an immediate retry with a bumped seqid when CLOSE/OPEN_DOWNGRADE receives NFS4ERR_OLD_STATEID. Instead, take the same approach used by OPEN and wait at least 5 seconds for outstanding stateid updates to complete if we can detect that we're out of sequence. Note that after this change it is still possible (though unlikely) that CLOSE waits a full 5 seconds, bumps the seqid, and retries -- and that attempt races with another OPEN at the same time. In order to avoid this race (which would result in the livelock), update nfs_need_update_open_stateid() to handle the case where: - the state is NFS_OPEN_STATE, and - the stateid doesn't match the current open stateid Finally, nfs_need_update_open_stateid() is modified to be idempotent and renamed to better suit the purpose of signaling that the stateid passed is the next stateid in sequence. Fixes: 0e0cb35b417f ("NFSv4: Handle NFS4ERR_OLD_STATEID in CLOSE/OPEN_DOWNGRADE") Cc: stable@vger.kernel.org # v5.4+ Signed-off-by: Benjamin Coddington Signed-off-by: Anna Schumaker --- fs/nfs/nfs4_fs.h | 8 ++++++ fs/nfs/nfs4proc.c | 81 +++++++++++++++++++++++++++++++----------------------- fs/nfs/nfs4trace.h | 1 + 3 files changed, 56 insertions(+), 34 deletions(-) (limited to 'fs/nfs') diff --git a/fs/nfs/nfs4_fs.h b/fs/nfs/nfs4_fs.h index 0c9505dc852c..065cb04222a1 100644 --- a/fs/nfs/nfs4_fs.h +++ b/fs/nfs/nfs4_fs.h @@ -599,6 +599,14 @@ static inline bool nfs4_stateid_is_newer(const nfs4_stateid *s1, const nfs4_stat return (s32)(be32_to_cpu(s1->seqid) - be32_to_cpu(s2->seqid)) > 0; } +static inline bool nfs4_stateid_is_next(const nfs4_stateid *s1, const nfs4_stateid *s2) +{ + u32 seq1 = be32_to_cpu(s1->seqid); + u32 seq2 = be32_to_cpu(s2->seqid); + + return seq2 == seq1 + 1U || (seq2 == 1U && seq1 == 0xffffffffU); +} + static inline bool nfs4_stateid_match_or_older(const nfs4_stateid *dst, const nfs4_stateid *src) { return nfs4_stateid_match_other(dst, src) && diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c index 542961ffa529..f7ef2ca699a5 100644 --- a/fs/nfs/nfs4proc.c +++ b/fs/nfs/nfs4proc.c @@ -1550,19 +1550,6 @@ static void nfs_state_log_update_open_stateid(struct nfs4_state *state) wake_up_all(&state->waitq); } -static void nfs_state_log_out_of_order_open_stateid(struct nfs4_state *state, - const nfs4_stateid *stateid) -{ - u32 state_seqid = be32_to_cpu(state->open_stateid.seqid); - u32 stateid_seqid = be32_to_cpu(stateid->seqid); - - if (stateid_seqid == state_seqid + 1U || - (stateid_seqid == 1U && state_seqid == 0xffffffffU)) - nfs_state_log_update_open_stateid(state); - else - set_bit(NFS_STATE_CHANGE_WAIT, &state->flags); -} - static void nfs_test_and_clear_all_open_stateid(struct nfs4_state *state) { struct nfs_client *clp = state->owner->so_server->nfs_client; @@ -1588,21 +1575,19 @@ static void nfs_test_and_clear_all_open_stateid(struct nfs4_state *state) * i.e. The stateid seqids have to be initialised to 1, and * are then incremented on every state transition. */ -static bool nfs_need_update_open_stateid(struct nfs4_state *state, +static bool nfs_stateid_is_sequential(struct nfs4_state *state, const nfs4_stateid *stateid) { - if (test_bit(NFS_OPEN_STATE, &state->flags) == 0 || - !nfs4_stateid_match_other(stateid, &state->open_stateid)) { + if (test_bit(NFS_OPEN_STATE, &state->flags)) { + /* The common case - we're updating to a new sequence number */ + if (nfs4_stateid_match_other(stateid, &state->open_stateid) && + nfs4_stateid_is_next(&state->open_stateid, stateid)) { + return true; + } + } else { + /* This is the first OPEN in this generation */ if (stateid->seqid == cpu_to_be32(1)) - nfs_state_log_update_open_stateid(state); - else - set_bit(NFS_STATE_CHANGE_WAIT, &state->flags); - return true; - } - - if (nfs4_stateid_is_newer(stateid, &state->open_stateid)) { - nfs_state_log_out_of_order_open_stateid(state, stateid); - return true; + return true; } return false; } @@ -1676,16 +1661,16 @@ static void nfs_set_open_stateid_locked(struct nfs4_state *state, int status = 0; for (;;) { - if (!nfs_need_update_open_stateid(state, stateid)) - return; - if (!test_bit(NFS_STATE_CHANGE_WAIT, &state->flags)) + if (nfs_stateid_is_sequential(state, stateid)) break; + if (status) break; /* Rely on seqids for serialisation with NFSv4.0 */ if (!nfs4_has_session(NFS_SERVER(state->inode)->nfs_client)) break; + set_bit(NFS_STATE_CHANGE_WAIT, &state->flags); prepare_to_wait(&state->waitq, &wait, TASK_KILLABLE); /* * Ensure we process the state changes in the same order @@ -1696,6 +1681,7 @@ static void nfs_set_open_stateid_locked(struct nfs4_state *state, spin_unlock(&state->owner->so_lock); rcu_read_unlock(); trace_nfs4_open_stateid_update_wait(state->inode, stateid, 0); + if (!signal_pending(current)) { if (schedule_timeout(5*HZ) == 0) status = -EAGAIN; @@ -3438,7 +3424,8 @@ static bool nfs4_refresh_open_old_stateid(nfs4_stateid *dst, __be32 seqid_open; u32 dst_seqid; bool ret; - int seq; + int seq, status = -EAGAIN; + DEFINE_WAIT(wait); for (;;) { ret = false; @@ -3450,15 +3437,41 @@ static bool nfs4_refresh_open_old_stateid(nfs4_stateid *dst, continue; break; } + + write_seqlock(&state->seqlock); seqid_open = state->open_stateid.seqid; - if (read_seqretry(&state->seqlock, seq)) - continue; dst_seqid = be32_to_cpu(dst->seqid); - if ((s32)(dst_seqid - be32_to_cpu(seqid_open)) >= 0) - dst->seqid = cpu_to_be32(dst_seqid + 1); - else + + /* Did another OPEN bump the state's seqid? try again: */ + if ((s32)(be32_to_cpu(seqid_open) - dst_seqid) > 0) { dst->seqid = seqid_open; + write_sequnlock(&state->seqlock); + ret = true; + break; + } + + /* server says we're behind but we haven't seen the update yet */ + set_bit(NFS_STATE_CHANGE_WAIT, &state->flags); + prepare_to_wait(&state->waitq, &wait, TASK_KILLABLE); + write_sequnlock(&state->seqlock); + trace_nfs4_close_stateid_update_wait(state->inode, dst, 0); + + if (signal_pending(current)) + status = -EINTR; + else + if (schedule_timeout(5*HZ) != 0) + status = 0; + + finish_wait(&state->waitq, &wait); + + if (!status) + continue; + if (status == -EINTR) + break; + + /* we slept the whole 5 seconds, we must have lost a seqid */ + dst->seqid = cpu_to_be32(dst_seqid + 1); ret = true; break; } diff --git a/fs/nfs/nfs4trace.h b/fs/nfs/nfs4trace.h index b4f852d4d099..484c1da96dea 100644 --- a/fs/nfs/nfs4trace.h +++ b/fs/nfs/nfs4trace.h @@ -1511,6 +1511,7 @@ DEFINE_NFS4_INODE_STATEID_EVENT(nfs4_setattr); DEFINE_NFS4_INODE_STATEID_EVENT(nfs4_delegreturn); DEFINE_NFS4_INODE_STATEID_EVENT(nfs4_open_stateid_update); DEFINE_NFS4_INODE_STATEID_EVENT(nfs4_open_stateid_update_wait); +DEFINE_NFS4_INODE_STATEID_EVENT(nfs4_close_stateid_update_wait); DECLARE_EVENT_CLASS(nfs4_getattr_event, TP_PROTO( -- cgit v1.2.3-58-ga151