diff options
| -rw-r--r-- | fs/nfs/callback_proc.c | 119 | ||||
| -rw-r--r-- | fs/nfs/nfs4_fs.h | 1 | ||||
| -rw-r--r-- | fs/nfs/pnfs.c | 83 | ||||
| -rw-r--r-- | fs/nfs/pnfs.h | 11 |
4 files changed, 194 insertions, 20 deletions
diff --git a/fs/nfs/callback_proc.c b/fs/nfs/callback_proc.c index c1bb157..6619c05 100644 --- a/fs/nfs/callback_proc.c +++ b/fs/nfs/callback_proc.c @@ -12,6 +12,7 @@ #include "callback.h" #include "delegation.h" #include "internal.h" +#include "pnfs.h" #ifdef NFS_DEBUG #define NFSDBG_FACILITY NFSDBG_CALLBACK @@ -107,10 +108,126 @@ int nfs4_validate_delegation_stateid(struct nfs_delegation *delegation, const nf #if defined(CONFIG_NFS_V4_1) +static u32 initiate_file_draining(struct nfs_client *clp, + struct cb_layoutrecallargs *args) +{ + struct pnfs_layout_hdr *lo; + struct inode *ino; + bool found = false; + u32 rv = NFS4ERR_NOMATCHING_LAYOUT; + LIST_HEAD(free_me_list); + + spin_lock(&clp->cl_lock); + list_for_each_entry(lo, &clp->cl_layouts, plh_layouts) { + if (nfs_compare_fh(&args->cbl_fh, + &NFS_I(lo->plh_inode)->fh)) + continue; + ino = igrab(lo->plh_inode); + if (!ino) + continue; + found = true; + /* Without this, layout can be freed as soon + * as we release cl_lock. + */ + get_layout_hdr(lo); + break; + } + spin_unlock(&clp->cl_lock); + if (!found) + return NFS4ERR_NOMATCHING_LAYOUT; + + spin_lock(&ino->i_lock); + if (test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags) || + mark_matching_lsegs_invalid(lo, &free_me_list, + args->cbl_range.iomode)) + rv = NFS4ERR_DELAY; + else + rv = NFS4ERR_NOMATCHING_LAYOUT; + pnfs_set_layout_stateid(lo, &args->cbl_stateid, true); + spin_unlock(&ino->i_lock); + pnfs_free_lseg_list(&free_me_list); + put_layout_hdr(lo); + iput(ino); + return rv; +} + +static u32 initiate_bulk_draining(struct nfs_client *clp, + struct cb_layoutrecallargs *args) +{ + struct pnfs_layout_hdr *lo; + struct inode *ino; + u32 rv = NFS4ERR_NOMATCHING_LAYOUT; + struct pnfs_layout_hdr *tmp; + LIST_HEAD(recall_list); + LIST_HEAD(free_me_list); + struct pnfs_layout_range range = { + .iomode = IOMODE_ANY, + .offset = 0, + .length = NFS4_MAX_UINT64, + }; + + spin_lock(&clp->cl_lock); + list_for_each_entry(lo, &clp->cl_layouts, plh_layouts) { + if ((args->cbl_recall_type == RETURN_FSID) && + memcmp(&NFS_SERVER(lo->plh_inode)->fsid, + &args->cbl_fsid, sizeof(struct nfs_fsid))) + continue; + if (!igrab(lo->plh_inode)) + continue; + get_layout_hdr(lo); + BUG_ON(!list_empty(&lo->plh_bulk_recall)); + list_add(&lo->plh_bulk_recall, &recall_list); + } + spin_unlock(&clp->cl_lock); + list_for_each_entry_safe(lo, tmp, + &recall_list, plh_bulk_recall) { + ino = lo->plh_inode; + spin_lock(&ino->i_lock); + set_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags); + if (mark_matching_lsegs_invalid(lo, &free_me_list, range.iomode)) + rv = NFS4ERR_DELAY; + list_del_init(&lo->plh_bulk_recall); + spin_unlock(&ino->i_lock); + put_layout_hdr(lo); + iput(ino); + } + pnfs_free_lseg_list(&free_me_list); + return rv; +} + +static u32 do_callback_layoutrecall(struct nfs_client *clp, + struct cb_layoutrecallargs *args) +{ + u32 res = NFS4ERR_DELAY; + + dprintk("%s enter, type=%i\n", __func__, args->cbl_recall_type); + if (test_and_set_bit(NFS4CLNT_LAYOUTRECALL, &clp->cl_state)) + goto out; + if (args->cbl_recall_type == RETURN_FILE) + res = initiate_file_draining(clp, args); + else + res = initiate_bulk_draining(clp, args); + clear_bit(NFS4CLNT_LAYOUTRECALL, &clp->cl_state); +out: + dprintk("%s returning %i\n", __func__, res); + return res; + +} + __be32 nfs4_callback_layoutrecall(struct cb_layoutrecallargs *args, void *dummy, struct cb_process_state *cps) { - return cpu_to_be32(NFS4ERR_NOTSUPP); /* STUB */ + u32 res; + + dprintk("%s: -->\n", __func__); + + if (cps->clp) + res = do_callback_layoutrecall(cps->clp, args); + else + res = NFS4ERR_OP_NOT_IN_SESSION; + + dprintk("%s: exit with status = %d\n", __func__, res); + return cpu_to_be32(res); } int nfs41_validate_delegation_stateid(struct nfs_delegation *delegation, const nfs4_stateid *stateid) diff --git a/fs/nfs/nfs4_fs.h b/fs/nfs/nfs4_fs.h index 3b3829c..8f169dc 100644 --- a/fs/nfs/nfs4_fs.h +++ b/fs/nfs/nfs4_fs.h @@ -44,6 +44,7 @@ enum nfs4_client_state { NFS4CLNT_RECLAIM_REBOOT, NFS4CLNT_RECLAIM_NOGRACE, NFS4CLNT_DELEGRETURN, + NFS4CLNT_LAYOUTRECALL, NFS4CLNT_SESSION_RESET, NFS4CLNT_RECALL_SLOT, }; diff --git a/fs/nfs/pnfs.c b/fs/nfs/pnfs.c index 32b6646..bf4186b 100644 --- a/fs/nfs/pnfs.c +++ b/fs/nfs/pnfs.c @@ -178,7 +178,7 @@ EXPORT_SYMBOL_GPL(pnfs_unregister_layoutdriver); */ /* Need to hold i_lock if caller does not already hold reference */ -static void +void get_layout_hdr(struct pnfs_layout_hdr *lo) { atomic_inc(&lo->plh_refcount); @@ -254,6 +254,7 @@ put_lseg_locked(struct pnfs_layout_segment *lseg, /* List does not take a reference, so no need for put here */ list_del_init(&lseg->pls_layout->plh_layouts); spin_unlock(&clp->cl_lock); + clear_bit(NFS_LAYOUT_BULK_RECALL, &lseg->pls_layout->plh_flags); } list_add(&lseg->pls_list, tmp_list); return 1; @@ -287,7 +288,7 @@ static int mark_lseg_invalid(struct pnfs_layout_segment *lseg, /* Returns count of number of matching invalid lsegs remaining in list * after call. */ -static int +int mark_matching_lsegs_invalid(struct pnfs_layout_hdr *lo, struct list_head *tmp_list, u32 iomode) @@ -310,7 +311,7 @@ mark_matching_lsegs_invalid(struct pnfs_layout_hdr *lo, return invalid - removed; } -static void +void pnfs_free_lseg_list(struct list_head *free_me) { struct pnfs_layout_segment *lseg, *tmp; @@ -363,23 +364,45 @@ pnfs_destroy_all_layouts(struct nfs_client *clp) } /* update lo->plh_stateid with new if is more recent */ -static void -pnfs_set_layout_stateid(struct pnfs_layout_hdr *lo, - const nfs4_stateid *new) +void +pnfs_set_layout_stateid(struct pnfs_layout_hdr *lo, const nfs4_stateid *new, + bool update_barrier) { u32 oldseq, newseq; oldseq = be32_to_cpu(lo->plh_stateid.stateid.seqid); newseq = be32_to_cpu(new->stateid.seqid); - if ((int)(newseq - oldseq) > 0) + if ((int)(newseq - oldseq) > 0) { memcpy(&lo->plh_stateid, &new->stateid, sizeof(new->stateid)); + if (update_barrier) { + u32 new_barrier = be32_to_cpu(new->stateid.seqid); + + if ((int)(new_barrier - lo->plh_barrier)) + lo->plh_barrier = new_barrier; + } else { + /* Because of wraparound, we want to keep the barrier + * "close" to the current seqids. It needs to be + * within 2**31 to count as "behind", so if it + * gets too near that limit, give us a litle leeway + * and bring it to within 2**30. + * NOTE - and yes, this is all unsigned arithmetic. + */ + if (unlikely((newseq - lo->plh_barrier) > (3 << 29))) + lo->plh_barrier = newseq - (1 << 30); + } + } } /* lget is set to 1 if called from inside send_layoutget call chain */ static bool -pnfs_layoutgets_blocked(struct pnfs_layout_hdr *lo, int lget) -{ - return (list_empty(&lo->plh_segs) && +pnfs_layoutgets_blocked(struct pnfs_layout_hdr *lo, nfs4_stateid *stateid, + int lget) +{ + if ((stateid) && + (int)(lo->plh_barrier - be32_to_cpu(stateid->stateid.seqid)) >= 0) + return true; + return test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags) || + (list_empty(&lo->plh_segs) && (atomic_read(&lo->plh_outstanding) > lget)); } @@ -391,7 +414,7 @@ pnfs_choose_layoutget_stateid(nfs4_stateid *dst, struct pnfs_layout_hdr *lo, dprintk("--> %s\n", __func__); spin_lock(&lo->plh_inode->i_lock); - if (pnfs_layoutgets_blocked(lo, 1)) { + if (pnfs_layoutgets_blocked(lo, NULL, 1)) { status = -EAGAIN; } else if (list_empty(&lo->plh_segs)) { int seq; @@ -510,6 +533,7 @@ alloc_init_layout_hdr(struct inode *ino) atomic_set(&lo->plh_refcount, 1); INIT_LIST_HEAD(&lo->plh_layouts); INIT_LIST_HEAD(&lo->plh_segs); + INIT_LIST_HEAD(&lo->plh_bulk_recall); lo->plh_inode = ino; return lo; } @@ -561,7 +585,7 @@ is_matching_lseg(struct pnfs_layout_segment *lseg, u32 iomode) * lookup range in layout */ static struct pnfs_layout_segment * -pnfs_has_layout(struct pnfs_layout_hdr *lo, u32 iomode) +pnfs_find_lseg(struct pnfs_layout_hdr *lo, u32 iomode) { struct pnfs_layout_segment *lseg, *ret = NULL; @@ -606,19 +630,22 @@ pnfs_update_layout(struct inode *ino, goto out_unlock; } - /* Check to see if the layout for the given range already exists */ - lseg = pnfs_has_layout(lo, iomode); - if (lseg) { - dprintk("%s: Using cached lseg %p for iomode %d)\n", - __func__, lseg, iomode); + /* Do we even need to bother with this? */ + if (test_bit(NFS4CLNT_LAYOUTRECALL, &clp->cl_state) || + test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags)) { + dprintk("%s matches recall, use MDS\n", __func__); goto out_unlock; } + /* Check to see if the layout for the given range already exists */ + lseg = pnfs_find_lseg(lo, iomode); + if (lseg) + goto out_unlock; /* if LAYOUTGET already failed once we don't try again */ if (test_bit(lo_fail_bit(iomode), &nfsi->layout->plh_flags)) goto out_unlock; - if (pnfs_layoutgets_blocked(lo, 0)) + if (pnfs_layoutgets_blocked(lo, NULL, 0)) goto out_unlock; atomic_inc(&lo->plh_outstanding); @@ -641,6 +668,7 @@ pnfs_update_layout(struct inode *ino, spin_lock(&clp->cl_lock); list_del_init(&lo->plh_layouts); spin_unlock(&clp->cl_lock); + clear_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags); } spin_unlock(&ino->i_lock); } @@ -662,6 +690,7 @@ pnfs_layout_process(struct nfs4_layoutget *lgp) struct nfs4_layoutget_res *res = &lgp->res; struct pnfs_layout_segment *lseg; struct inode *ino = lo->plh_inode; + struct nfs_client *clp = NFS_SERVER(ino)->nfs_client; int status = 0; /* Verify we got what we asked for. @@ -688,16 +717,32 @@ pnfs_layout_process(struct nfs4_layoutget *lgp) } spin_lock(&ino->i_lock); + if (test_bit(NFS4CLNT_LAYOUTRECALL, &clp->cl_state) || + test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags)) { + dprintk("%s forget reply due to recall\n", __func__); + goto out_forget_reply; + } + + if (pnfs_layoutgets_blocked(lo, &res->stateid, 1)) { + dprintk("%s forget reply due to state\n", __func__); + goto out_forget_reply; + } init_lseg(lo, lseg); lseg->pls_range = res->range; *lgp->lsegpp = lseg; pnfs_insert_layout(lo, lseg); /* Done processing layoutget. Set the layout stateid */ - pnfs_set_layout_stateid(lo, &res->stateid); + pnfs_set_layout_stateid(lo, &res->stateid, false); spin_unlock(&ino->i_lock); out: return status; + +out_forget_reply: + spin_unlock(&ino->i_lock); + lseg->pls_layout = lo; + NFS_SERVER(ino)->pnfs_curr_ld->free_lseg(lseg); + goto out; } /* diff --git a/fs/nfs/pnfs.h b/fs/nfs/pnfs.h index 8aaab56..f91d0d4 100644 --- a/fs/nfs/pnfs.h +++ b/fs/nfs/pnfs.h @@ -49,6 +49,7 @@ struct pnfs_layout_segment { enum { NFS_LAYOUT_RO_FAILED = 0, /* get ro layout failed stop trying */ NFS_LAYOUT_RW_FAILED, /* get rw layout failed stop trying */ + NFS_LAYOUT_BULK_RECALL, /* bulk recall affecting layout */ NFS_LAYOUT_DESTROYED, /* no new use of layout allowed */ }; @@ -67,9 +68,11 @@ struct pnfs_layoutdriver_type { struct pnfs_layout_hdr { atomic_t plh_refcount; struct list_head plh_layouts; /* other client layouts */ + struct list_head plh_bulk_recall; /* clnt list of bulk recalls */ struct list_head plh_segs; /* layout segments list */ nfs4_stateid plh_stateid; atomic_t plh_outstanding; /* number of RPCs out */ + u32 plh_barrier; /* ignore lower seqids */ unsigned long plh_flags; struct inode *plh_inode; }; @@ -139,18 +142,26 @@ extern int nfs4_proc_getdeviceinfo(struct nfs_server *server, extern int nfs4_proc_layoutget(struct nfs4_layoutget *lgp); /* pnfs.c */ +void get_layout_hdr(struct pnfs_layout_hdr *lo); struct pnfs_layout_segment * pnfs_update_layout(struct inode *ino, struct nfs_open_context *ctx, enum pnfs_iomode access_type); void set_pnfs_layoutdriver(struct nfs_server *, u32 id); void unset_pnfs_layoutdriver(struct nfs_server *); int pnfs_layout_process(struct nfs4_layoutget *lgp); +void pnfs_free_lseg_list(struct list_head *tmp_list); void pnfs_destroy_layout(struct nfs_inode *); void pnfs_destroy_all_layouts(struct nfs_client *); void put_layout_hdr(struct pnfs_layout_hdr *lo); +void pnfs_set_layout_stateid(struct pnfs_layout_hdr *lo, + const nfs4_stateid *new, + bool update_barrier); int pnfs_choose_layoutget_stateid(nfs4_stateid *dst, struct pnfs_layout_hdr *lo, struct nfs4_state *open_state); +int mark_matching_lsegs_invalid(struct pnfs_layout_hdr *lo, + struct list_head *tmp_list, + u32 iomode); static inline int lo_fail_bit(u32 iomode) |