| /* |
| * pNFS functions to call and manage layout drivers. |
| * |
| * Copyright (c) 2002 [year of first publication] |
| * The Regents of the University of Michigan |
| * All Rights Reserved |
| * |
| * Dean Hildebrand <dhildebz@umich.edu> |
| * |
| * Permission is granted to use, copy, create derivative works, and |
| * redistribute this software and such derivative works for any purpose, |
| * so long as the name of the University of Michigan is not used in |
| * any advertising or publicity pertaining to the use or distribution |
| * of this software without specific, written prior authorization. If |
| * the above copyright notice or any other identification of the |
| * University of Michigan is included in any copy of any portion of |
| * this software, then the disclaimer below must also be included. |
| * |
| * This software is provided as is, without representation or warranty |
| * of any kind either express or implied, including without limitation |
| * the implied warranties of merchantability, fitness for a particular |
| * purpose, or noninfringement. The Regents of the University of |
| * Michigan shall not be liable for any damages, including special, |
| * indirect, incidental, or consequential damages, with respect to any |
| * claim arising out of or in connection with the use of the software, |
| * even if it has been or is hereafter advised of the possibility of |
| * such damages. |
| */ |
| |
| #include <linux/nfs_fs.h> |
| #include <linux/nfs_page.h> |
| #include <linux/module.h> |
| #include <linux/sort.h> |
| #include "internal.h" |
| #include "pnfs.h" |
| #include "iostat.h" |
| #include "nfs4trace.h" |
| #include "delegation.h" |
| #include "nfs42.h" |
| #include "nfs4_fs.h" |
| |
| #define NFSDBG_FACILITY NFSDBG_PNFS |
| #define PNFS_LAYOUTGET_RETRY_TIMEOUT (120*HZ) |
| |
| /* Locking: |
| * |
| * pnfs_spinlock: |
| * protects pnfs_modules_tbl. |
| */ |
| static DEFINE_SPINLOCK(pnfs_spinlock); |
| |
| /* |
| * pnfs_modules_tbl holds all pnfs modules |
| */ |
| static LIST_HEAD(pnfs_modules_tbl); |
| |
| static void pnfs_layoutreturn_before_put_layout_hdr(struct pnfs_layout_hdr *lo); |
| static void pnfs_free_returned_lsegs(struct pnfs_layout_hdr *lo, |
| struct list_head *free_me, |
| const struct pnfs_layout_range *range, |
| u32 seq); |
| static bool pnfs_lseg_dec_and_remove_zero(struct pnfs_layout_segment *lseg, |
| struct list_head *tmp_list); |
| static int pnfs_layout_return_on_reboot(struct pnfs_layout_hdr *lo); |
| |
| /* Return the registered pnfs layout driver module matching given id */ |
| static struct pnfs_layoutdriver_type * |
| find_pnfs_driver_locked(u32 id) |
| { |
| struct pnfs_layoutdriver_type *local; |
| |
| list_for_each_entry(local, &pnfs_modules_tbl, pnfs_tblid) |
| if (local->id == id) |
| goto out; |
| local = NULL; |
| out: |
| dprintk("%s: Searching for id %u, found %p\n", __func__, id, local); |
| return local; |
| } |
| |
| static struct pnfs_layoutdriver_type * |
| find_pnfs_driver(u32 id) |
| { |
| struct pnfs_layoutdriver_type *local; |
| |
| spin_lock(&pnfs_spinlock); |
| local = find_pnfs_driver_locked(id); |
| if (local != NULL && !try_module_get(local->owner)) { |
| dprintk("%s: Could not grab reference on module\n", __func__); |
| local = NULL; |
| } |
| spin_unlock(&pnfs_spinlock); |
| return local; |
| } |
| |
| const struct pnfs_layoutdriver_type *pnfs_find_layoutdriver(u32 id) |
| { |
| return find_pnfs_driver(id); |
| } |
| |
| void pnfs_put_layoutdriver(const struct pnfs_layoutdriver_type *ld) |
| { |
| if (ld) |
| module_put(ld->owner); |
| } |
| |
| void |
| unset_pnfs_layoutdriver(struct nfs_server *nfss) |
| { |
| if (nfss->pnfs_curr_ld) { |
| if (nfss->pnfs_curr_ld->clear_layoutdriver) |
| nfss->pnfs_curr_ld->clear_layoutdriver(nfss); |
| /* Decrement the MDS count. Purge the deviceid cache if zero */ |
| if (atomic_dec_and_test(&nfss->nfs_client->cl_mds_count)) |
| nfs4_deviceid_purge_client(nfss->nfs_client); |
| module_put(nfss->pnfs_curr_ld->owner); |
| } |
| nfss->pnfs_curr_ld = NULL; |
| } |
| |
| /* |
| * When the server sends a list of layout types, we choose one in the order |
| * given in the list below. |
| * |
| * FIXME: should this list be configurable in some fashion? module param? |
| * mount option? something else? |
| */ |
| static const u32 ld_prefs[] = { |
| LAYOUT_SCSI, |
| LAYOUT_BLOCK_VOLUME, |
| LAYOUT_OSD2_OBJECTS, |
| LAYOUT_FLEX_FILES, |
| LAYOUT_NFSV4_1_FILES, |
| 0 |
| }; |
| |
| static int |
| ld_cmp(const void *e1, const void *e2) |
| { |
| u32 ld1 = *((u32 *)e1); |
| u32 ld2 = *((u32 *)e2); |
| int i; |
| |
| for (i = 0; ld_prefs[i] != 0; i++) { |
| if (ld1 == ld_prefs[i]) |
| return -1; |
| |
| if (ld2 == ld_prefs[i]) |
| return 1; |
| } |
| return 0; |
| } |
| |
| /* |
| * Try to set the server's pnfs module to the pnfs layout type specified by id. |
| * Currently only one pNFS layout driver per filesystem is supported. |
| * |
| * @ids array of layout types supported by MDS. |
| */ |
| void |
| set_pnfs_layoutdriver(struct nfs_server *server, const struct nfs_fh *mntfh, |
| struct nfs_fsinfo *fsinfo) |
| { |
| struct pnfs_layoutdriver_type *ld_type = NULL; |
| u32 id; |
| int i; |
| |
| if (fsinfo->nlayouttypes == 0) |
| goto out_no_driver; |
| if (!(server->nfs_client->cl_exchange_flags & |
| (EXCHGID4_FLAG_USE_NON_PNFS | EXCHGID4_FLAG_USE_PNFS_MDS))) { |
| printk(KERN_ERR "NFS: %s: cl_exchange_flags 0x%x\n", |
| __func__, server->nfs_client->cl_exchange_flags); |
| goto out_no_driver; |
| } |
| |
| sort(fsinfo->layouttype, fsinfo->nlayouttypes, |
| sizeof(*fsinfo->layouttype), ld_cmp, NULL); |
| |
| for (i = 0; i < fsinfo->nlayouttypes; i++) { |
| id = fsinfo->layouttype[i]; |
| ld_type = find_pnfs_driver(id); |
| if (!ld_type) { |
| request_module("%s-%u", LAYOUT_NFSV4_1_MODULE_PREFIX, |
| id); |
| ld_type = find_pnfs_driver(id); |
| } |
| if (ld_type) |
| break; |
| } |
| |
| if (!ld_type) { |
| dprintk("%s: No pNFS module found!\n", __func__); |
| goto out_no_driver; |
| } |
| |
| server->pnfs_curr_ld = ld_type; |
| if (ld_type->set_layoutdriver |
| && ld_type->set_layoutdriver(server, mntfh)) { |
| printk(KERN_ERR "NFS: %s: Error initializing pNFS layout " |
| "driver %u.\n", __func__, id); |
| module_put(ld_type->owner); |
| goto out_no_driver; |
| } |
| /* Bump the MDS count */ |
| atomic_inc(&server->nfs_client->cl_mds_count); |
| |
| dprintk("%s: pNFS module for %u set\n", __func__, id); |
| return; |
| |
| out_no_driver: |
| dprintk("%s: Using NFSv4 I/O\n", __func__); |
| server->pnfs_curr_ld = NULL; |
| } |
| |
| int |
| pnfs_register_layoutdriver(struct pnfs_layoutdriver_type *ld_type) |
| { |
| int status = -EINVAL; |
| struct pnfs_layoutdriver_type *tmp; |
| |
| if (ld_type->id == 0) { |
| printk(KERN_ERR "NFS: %s id 0 is reserved\n", __func__); |
| return status; |
| } |
| if (!ld_type->alloc_lseg || !ld_type->free_lseg) { |
| printk(KERN_ERR "NFS: %s Layout driver must provide " |
| "alloc_lseg and free_lseg.\n", __func__); |
| return status; |
| } |
| |
| spin_lock(&pnfs_spinlock); |
| tmp = find_pnfs_driver_locked(ld_type->id); |
| if (!tmp) { |
| list_add(&ld_type->pnfs_tblid, &pnfs_modules_tbl); |
| status = 0; |
| dprintk("%s Registering id:%u name:%s\n", __func__, ld_type->id, |
| ld_type->name); |
| } else { |
| printk(KERN_ERR "NFS: %s Module with id %d already loaded!\n", |
| __func__, ld_type->id); |
| } |
| spin_unlock(&pnfs_spinlock); |
| |
| return status; |
| } |
| EXPORT_SYMBOL_GPL(pnfs_register_layoutdriver); |
| |
| void |
| pnfs_unregister_layoutdriver(struct pnfs_layoutdriver_type *ld_type) |
| { |
| dprintk("%s Deregistering id:%u\n", __func__, ld_type->id); |
| spin_lock(&pnfs_spinlock); |
| list_del(&ld_type->pnfs_tblid); |
| spin_unlock(&pnfs_spinlock); |
| } |
| EXPORT_SYMBOL_GPL(pnfs_unregister_layoutdriver); |
| |
| /* |
| * pNFS client layout cache |
| */ |
| |
| /* Need to hold i_lock if caller does not already hold reference */ |
| void |
| pnfs_get_layout_hdr(struct pnfs_layout_hdr *lo) |
| { |
| refcount_inc(&lo->plh_refcount); |
| } |
| |
| static struct pnfs_layout_hdr * |
| pnfs_alloc_layout_hdr(struct inode *ino, gfp_t gfp_flags) |
| { |
| struct pnfs_layoutdriver_type *ld = NFS_SERVER(ino)->pnfs_curr_ld; |
| return ld->alloc_layout_hdr(ino, gfp_flags); |
| } |
| |
| static void |
| pnfs_free_layout_hdr(struct pnfs_layout_hdr *lo) |
| { |
| struct nfs_server *server = NFS_SERVER(lo->plh_inode); |
| struct pnfs_layoutdriver_type *ld = server->pnfs_curr_ld; |
| |
| if (test_and_clear_bit(NFS_LAYOUT_HASHED, &lo->plh_flags)) { |
| struct nfs_client *clp = server->nfs_client; |
| |
| spin_lock(&clp->cl_lock); |
| list_del_rcu(&lo->plh_layouts); |
| spin_unlock(&clp->cl_lock); |
| } |
| put_cred(lo->plh_lc_cred); |
| return ld->free_layout_hdr(lo); |
| } |
| |
| static void |
| pnfs_detach_layout_hdr(struct pnfs_layout_hdr *lo) |
| { |
| struct nfs_inode *nfsi = NFS_I(lo->plh_inode); |
| dprintk("%s: freeing layout cache %p\n", __func__, lo); |
| nfsi->layout = NULL; |
| /* Reset MDS Threshold I/O counters */ |
| nfsi->write_io = 0; |
| nfsi->read_io = 0; |
| } |
| |
| void |
| pnfs_put_layout_hdr(struct pnfs_layout_hdr *lo) |
| { |
| struct inode *inode; |
| unsigned long i_state; |
| |
| if (!lo) |
| return; |
| inode = lo->plh_inode; |
| pnfs_layoutreturn_before_put_layout_hdr(lo); |
| |
| if (refcount_dec_and_lock(&lo->plh_refcount, &inode->i_lock)) { |
| if (!list_empty(&lo->plh_segs)) |
| WARN_ONCE(1, "NFS: BUG unfreed layout segments.\n"); |
| pnfs_detach_layout_hdr(lo); |
| i_state = inode->i_state; |
| spin_unlock(&inode->i_lock); |
| pnfs_free_layout_hdr(lo); |
| /* Notify pnfs_destroy_layout_final() that we're done */ |
| if (i_state & (I_FREEING | I_CLEAR)) |
| wake_up_var(lo); |
| } |
| } |
| |
| static struct inode * |
| pnfs_grab_inode_layout_hdr(struct pnfs_layout_hdr *lo) |
| { |
| struct inode *inode = igrab(lo->plh_inode); |
| if (inode) |
| return inode; |
| set_bit(NFS_LAYOUT_INODE_FREEING, &lo->plh_flags); |
| return NULL; |
| } |
| |
| /* |
| * Compare 2 layout stateid sequence ids, to see which is newer, |
| * taking into account wraparound issues. |
| */ |
| static bool pnfs_seqid_is_newer(u32 s1, u32 s2) |
| { |
| return (s32)(s1 - s2) > 0; |
| } |
| |
| static void pnfs_barrier_update(struct pnfs_layout_hdr *lo, u32 newseq) |
| { |
| if (pnfs_seqid_is_newer(newseq, lo->plh_barrier) || !lo->plh_barrier) |
| lo->plh_barrier = newseq; |
| } |
| |
| static void |
| pnfs_set_plh_return_info(struct pnfs_layout_hdr *lo, enum pnfs_iomode iomode, |
| u32 seq) |
| { |
| if (lo->plh_return_iomode != 0 && lo->plh_return_iomode != iomode) |
| iomode = IOMODE_ANY; |
| lo->plh_return_iomode = iomode; |
| set_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags); |
| /* |
| * We must set lo->plh_return_seq to avoid livelocks with |
| * pnfs_layout_need_return() |
| */ |
| if (seq == 0) |
| seq = be32_to_cpu(lo->plh_stateid.seqid); |
| if (!lo->plh_return_seq || pnfs_seqid_is_newer(seq, lo->plh_return_seq)) |
| lo->plh_return_seq = seq; |
| pnfs_barrier_update(lo, seq); |
| } |
| |
| static void |
| pnfs_clear_layoutreturn_info(struct pnfs_layout_hdr *lo) |
| { |
| struct pnfs_layout_segment *lseg; |
| lo->plh_return_iomode = 0; |
| lo->plh_return_seq = 0; |
| clear_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags); |
| list_for_each_entry(lseg, &lo->plh_segs, pls_list) { |
| if (!test_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags)) |
| continue; |
| pnfs_set_plh_return_info(lo, lseg->pls_range.iomode, 0); |
| } |
| } |
| |
| static void pnfs_clear_layoutreturn_waitbit(struct pnfs_layout_hdr *lo) |
| { |
| clear_bit_unlock(NFS_LAYOUT_RETURN, &lo->plh_flags); |
| clear_bit(NFS_LAYOUT_RETURN_LOCK, &lo->plh_flags); |
| smp_mb__after_atomic(); |
| wake_up_bit(&lo->plh_flags, NFS_LAYOUT_RETURN); |
| rpc_wake_up(&NFS_SERVER(lo->plh_inode)->roc_rpcwaitq); |
| } |
| |
| static void |
| pnfs_clear_lseg_state(struct pnfs_layout_segment *lseg, |
| struct list_head *free_me) |
| { |
| clear_bit(NFS_LSEG_ROC, &lseg->pls_flags); |
| clear_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags); |
| if (test_and_clear_bit(NFS_LSEG_VALID, &lseg->pls_flags)) |
| pnfs_lseg_dec_and_remove_zero(lseg, free_me); |
| if (test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags)) |
| pnfs_lseg_dec_and_remove_zero(lseg, free_me); |
| } |
| |
| /* |
| * Update the seqid of a layout stateid after receiving |
| * NFS4ERR_OLD_STATEID |
| */ |
| bool nfs4_layout_refresh_old_stateid(nfs4_stateid *dst, |
| struct pnfs_layout_range *dst_range, |
| struct inode *inode) |
| { |
| struct pnfs_layout_hdr *lo; |
| struct pnfs_layout_range range = { |
| .iomode = IOMODE_ANY, |
| .offset = 0, |
| .length = NFS4_MAX_UINT64, |
| }; |
| bool ret = false; |
| LIST_HEAD(head); |
| int err; |
| |
| spin_lock(&inode->i_lock); |
| lo = NFS_I(inode)->layout; |
| if (lo && pnfs_layout_is_valid(lo) && |
| nfs4_stateid_match_other(dst, &lo->plh_stateid)) { |
| /* Is our call using the most recent seqid? If so, bump it */ |
| if (!nfs4_stateid_is_newer(&lo->plh_stateid, dst)) { |
| nfs4_stateid_seqid_inc(dst); |
| ret = true; |
| goto out; |
| } |
| /* Try to update the seqid to the most recent */ |
| err = pnfs_mark_matching_lsegs_return(lo, &head, &range, 0); |
| if (err != -EBUSY) { |
| dst->seqid = lo->plh_stateid.seqid; |
| *dst_range = range; |
| ret = true; |
| } |
| } |
| out: |
| spin_unlock(&inode->i_lock); |
| pnfs_free_lseg_list(&head); |
| return ret; |
| } |
| |
| /* |
| * Mark a pnfs_layout_hdr and all associated layout segments as invalid |
| * |
| * In order to continue using the pnfs_layout_hdr, a full recovery |
| * is required. |
| * Note that caller must hold inode->i_lock. |
| */ |
| int |
| pnfs_mark_layout_stateid_invalid(struct pnfs_layout_hdr *lo, |
| struct list_head *lseg_list) |
| { |
| struct pnfs_layout_range range = { |
| .iomode = IOMODE_ANY, |
| .offset = 0, |
| .length = NFS4_MAX_UINT64, |
| }; |
| struct pnfs_layout_segment *lseg, *next; |
| |
| set_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags); |
| list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list) |
| pnfs_clear_lseg_state(lseg, lseg_list); |
| pnfs_clear_layoutreturn_info(lo); |
| pnfs_free_returned_lsegs(lo, lseg_list, &range, 0); |
| set_bit(NFS_LAYOUT_DRAIN, &lo->plh_flags); |
| if (test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags) && |
| !test_and_set_bit(NFS_LAYOUT_RETURN_LOCK, &lo->plh_flags)) |
| pnfs_clear_layoutreturn_waitbit(lo); |
| return !list_empty(&lo->plh_segs); |
| } |
| |
| static int pnfs_mark_layout_stateid_return(struct pnfs_layout_hdr *lo, |
| struct list_head *lseg_list, |
| enum pnfs_iomode iomode, u32 seq) |
| { |
| struct pnfs_layout_range range = { |
| .iomode = iomode, |
| .length = NFS4_MAX_UINT64, |
| }; |
| |
| return pnfs_mark_matching_lsegs_return(lo, lseg_list, &range, seq); |
| } |
| |
| static int |
| pnfs_iomode_to_fail_bit(u32 iomode) |
| { |
| return iomode == IOMODE_RW ? |
| NFS_LAYOUT_RW_FAILED : NFS_LAYOUT_RO_FAILED; |
| } |
| |
| static void |
| pnfs_layout_set_fail_bit(struct pnfs_layout_hdr *lo, int fail_bit) |
| { |
| lo->plh_retry_timestamp = jiffies; |
| if (!test_and_set_bit(fail_bit, &lo->plh_flags)) |
| refcount_inc(&lo->plh_refcount); |
| } |
| |
| static void |
| pnfs_layout_clear_fail_bit(struct pnfs_layout_hdr *lo, int fail_bit) |
| { |
| if (test_and_clear_bit(fail_bit, &lo->plh_flags)) |
| refcount_dec(&lo->plh_refcount); |
| } |
| |
| static void |
| pnfs_layout_io_set_failed(struct pnfs_layout_hdr *lo, u32 iomode) |
| { |
| struct inode *inode = lo->plh_inode; |
| struct pnfs_layout_range range = { |
| .iomode = iomode, |
| .offset = 0, |
| .length = NFS4_MAX_UINT64, |
| }; |
| LIST_HEAD(head); |
| |
| spin_lock(&inode->i_lock); |
| pnfs_layout_set_fail_bit(lo, pnfs_iomode_to_fail_bit(iomode)); |
| pnfs_mark_matching_lsegs_return(lo, &head, &range, 0); |
| spin_unlock(&inode->i_lock); |
| pnfs_free_lseg_list(&head); |
| dprintk("%s Setting layout IOMODE_%s fail bit\n", __func__, |
| iomode == IOMODE_RW ? "RW" : "READ"); |
| } |
| |
| static bool |
| pnfs_layout_io_test_failed(struct pnfs_layout_hdr *lo, u32 iomode) |
| { |
| unsigned long start, end; |
| int fail_bit = pnfs_iomode_to_fail_bit(iomode); |
| |
| if (test_bit(fail_bit, &lo->plh_flags) == 0) |
| return false; |
| end = jiffies; |
| start = end - PNFS_LAYOUTGET_RETRY_TIMEOUT; |
| if (!time_in_range(lo->plh_retry_timestamp, start, end)) { |
| /* It is time to retry the failed layoutgets */ |
| pnfs_layout_clear_fail_bit(lo, fail_bit); |
| return false; |
| } |
| return true; |
| } |
| |
| static void |
| pnfs_init_lseg(struct pnfs_layout_hdr *lo, struct pnfs_layout_segment *lseg, |
| const struct pnfs_layout_range *range, |
| const nfs4_stateid *stateid) |
| { |
| INIT_LIST_HEAD(&lseg->pls_list); |
| INIT_LIST_HEAD(&lseg->pls_lc_list); |
| INIT_LIST_HEAD(&lseg->pls_commits); |
| refcount_set(&lseg->pls_refcount, 1); |
| set_bit(NFS_LSEG_VALID, &lseg->pls_flags); |
| lseg->pls_layout = lo; |
| lseg->pls_range = *range; |
| lseg->pls_seq = be32_to_cpu(stateid->seqid); |
| } |
| |
| static void pnfs_free_lseg(struct pnfs_layout_segment *lseg) |
| { |
| if (lseg != NULL) { |
| struct inode *inode = lseg->pls_layout->plh_inode; |
| NFS_SERVER(inode)->pnfs_curr_ld->free_lseg(lseg); |
| } |
| } |
| |
| static void |
| pnfs_layout_remove_lseg(struct pnfs_layout_hdr *lo, |
| struct pnfs_layout_segment *lseg) |
| { |
| WARN_ON(test_bit(NFS_LSEG_VALID, &lseg->pls_flags)); |
| list_del_init(&lseg->pls_list); |
| /* Matched by pnfs_get_layout_hdr in pnfs_layout_insert_lseg */ |
| refcount_dec(&lo->plh_refcount); |
| if (test_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags)) |
| return; |
| if (list_empty(&lo->plh_segs) && |
| !test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags) && |
| !test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags)) { |
| if (atomic_read(&lo->plh_outstanding) == 0) |
| set_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags); |
| clear_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags); |
| } |
| } |
| |
| static bool |
| pnfs_cache_lseg_for_layoutreturn(struct pnfs_layout_hdr *lo, |
| struct pnfs_layout_segment *lseg) |
| { |
| if (test_and_clear_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags) && |
| pnfs_layout_is_valid(lo)) { |
| pnfs_set_plh_return_info(lo, lseg->pls_range.iomode, 0); |
| list_move_tail(&lseg->pls_list, &lo->plh_return_segs); |
| return true; |
| } |
| return false; |
| } |
| |
| void |
| pnfs_put_lseg(struct pnfs_layout_segment *lseg) |
| { |
| struct pnfs_layout_hdr *lo; |
| struct inode *inode; |
| |
| if (!lseg) |
| return; |
| |
| dprintk("%s: lseg %p ref %d valid %d\n", __func__, lseg, |
| refcount_read(&lseg->pls_refcount), |
| test_bit(NFS_LSEG_VALID, &lseg->pls_flags)); |
| |
| lo = lseg->pls_layout; |
| inode = lo->plh_inode; |
| |
| if (refcount_dec_and_lock(&lseg->pls_refcount, &inode->i_lock)) { |
| pnfs_get_layout_hdr(lo); |
| pnfs_layout_remove_lseg(lo, lseg); |
| if (pnfs_cache_lseg_for_layoutreturn(lo, lseg)) |
| lseg = NULL; |
| spin_unlock(&inode->i_lock); |
| pnfs_free_lseg(lseg); |
| pnfs_put_layout_hdr(lo); |
| } |
| } |
| EXPORT_SYMBOL_GPL(pnfs_put_lseg); |
| |
| /* |
| * is l2 fully contained in l1? |
| * start1 end1 |
| * [----------------------------------) |
| * start2 end2 |
| * [----------------) |
| */ |
| static bool |
| pnfs_lseg_range_contained(const struct pnfs_layout_range *l1, |
| const struct pnfs_layout_range *l2) |
| { |
| u64 start1 = l1->offset; |
| u64 end1 = pnfs_end_offset(start1, l1->length); |
| u64 start2 = l2->offset; |
| u64 end2 = pnfs_end_offset(start2, l2->length); |
| |
| return (start1 <= start2) && (end1 >= end2); |
| } |
| |
| static bool pnfs_lseg_dec_and_remove_zero(struct pnfs_layout_segment *lseg, |
| struct list_head *tmp_list) |
| { |
| if (!refcount_dec_and_test(&lseg->pls_refcount)) |
| return false; |
| pnfs_layout_remove_lseg(lseg->pls_layout, lseg); |
| list_add(&lseg->pls_list, tmp_list); |
| return true; |
| } |
| |
| /* Returns 1 if lseg is removed from list, 0 otherwise */ |
| static int mark_lseg_invalid(struct pnfs_layout_segment *lseg, |
| struct list_head *tmp_list) |
| { |
| int rv = 0; |
| |
| if (test_and_clear_bit(NFS_LSEG_VALID, &lseg->pls_flags)) { |
| /* Remove the reference keeping the lseg in the |
| * list. It will now be removed when all |
| * outstanding io is finished. |
| */ |
| dprintk("%s: lseg %p ref %d\n", __func__, lseg, |
| refcount_read(&lseg->pls_refcount)); |
| if (pnfs_lseg_dec_and_remove_zero(lseg, tmp_list)) |
| rv = 1; |
| } |
| return rv; |
| } |
| |
| static bool |
| pnfs_should_free_range(const struct pnfs_layout_range *lseg_range, |
| const struct pnfs_layout_range *recall_range) |
| { |
| return (recall_range->iomode == IOMODE_ANY || |
| lseg_range->iomode == recall_range->iomode) && |
| pnfs_lseg_range_intersecting(lseg_range, recall_range); |
| } |
| |
| static bool |
| pnfs_match_lseg_recall(const struct pnfs_layout_segment *lseg, |
| const struct pnfs_layout_range *recall_range, |
| u32 seq) |
| { |
| if (seq != 0 && pnfs_seqid_is_newer(lseg->pls_seq, seq)) |
| return false; |
| if (recall_range == NULL) |
| return true; |
| return pnfs_should_free_range(&lseg->pls_range, recall_range); |
| } |
| |
| /** |
| * pnfs_mark_matching_lsegs_invalid - tear down lsegs or mark them for later |
| * @lo: layout header containing the lsegs |
| * @tmp_list: list head where doomed lsegs should go |
| * @recall_range: optional recall range argument to match (may be NULL) |
| * @seq: only invalidate lsegs obtained prior to this sequence (may be 0) |
| * |
| * Walk the list of lsegs in the layout header, and tear down any that should |
| * be destroyed. If "recall_range" is specified then the segment must match |
| * that range. If "seq" is non-zero, then only match segments that were handed |
| * out at or before that sequence. |
| * |
| * Returns number of matching invalid lsegs remaining in list after scanning |
| * it and purging them. |
| */ |
| int |
| pnfs_mark_matching_lsegs_invalid(struct pnfs_layout_hdr *lo, |
| struct list_head *tmp_list, |
| const struct pnfs_layout_range *recall_range, |
| u32 seq) |
| { |
| struct pnfs_layout_segment *lseg, *next; |
| struct nfs_server *server = NFS_SERVER(lo->plh_inode); |
| int remaining = 0; |
| |
| dprintk("%s:Begin lo %p\n", __func__, lo); |
| |
| if (list_empty(&lo->plh_segs)) |
| return 0; |
| list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list) |
| if (pnfs_match_lseg_recall(lseg, recall_range, seq)) { |
| dprintk("%s: freeing lseg %p iomode %d seq %u " |
| "offset %llu length %llu\n", __func__, |
| lseg, lseg->pls_range.iomode, lseg->pls_seq, |
| lseg->pls_range.offset, lseg->pls_range.length); |
| if (mark_lseg_invalid(lseg, tmp_list)) |
| continue; |
| remaining++; |
| pnfs_lseg_cancel_io(server, lseg); |
| } |
| dprintk("%s:Return %i\n", __func__, remaining); |
| return remaining; |
| } |
| |
| static void |
| pnfs_free_returned_lsegs(struct pnfs_layout_hdr *lo, |
| struct list_head *free_me, |
| const struct pnfs_layout_range *range, |
| u32 seq) |
| { |
| struct pnfs_layout_segment *lseg, *next; |
| |
| list_for_each_entry_safe(lseg, next, &lo->plh_return_segs, pls_list) { |
| if (pnfs_match_lseg_recall(lseg, range, seq)) |
| list_move_tail(&lseg->pls_list, free_me); |
| } |
| } |
| |
| /* note free_me must contain lsegs from a single layout_hdr */ |
| void |
| pnfs_free_lseg_list(struct list_head *free_me) |
| { |
| struct pnfs_layout_segment *lseg, *tmp; |
| |
| if (list_empty(free_me)) |
| return; |
| |
| list_for_each_entry_safe(lseg, tmp, free_me, pls_list) { |
| list_del(&lseg->pls_list); |
| pnfs_free_lseg(lseg); |
| } |
| } |
| |
| static struct pnfs_layout_hdr *__pnfs_destroy_layout(struct nfs_inode *nfsi) |
| { |
| struct pnfs_layout_hdr *lo; |
| LIST_HEAD(tmp_list); |
| |
| spin_lock(&nfsi->vfs_inode.i_lock); |
| lo = nfsi->layout; |
| if (lo) { |
| pnfs_get_layout_hdr(lo); |
| pnfs_mark_layout_stateid_invalid(lo, &tmp_list); |
| pnfs_layout_clear_fail_bit(lo, NFS_LAYOUT_RO_FAILED); |
| pnfs_layout_clear_fail_bit(lo, NFS_LAYOUT_RW_FAILED); |
| spin_unlock(&nfsi->vfs_inode.i_lock); |
| pnfs_free_lseg_list(&tmp_list); |
| nfs_commit_inode(&nfsi->vfs_inode, 0); |
| pnfs_put_layout_hdr(lo); |
| } else |
| spin_unlock(&nfsi->vfs_inode.i_lock); |
| return lo; |
| } |
| |
| void pnfs_destroy_layout(struct nfs_inode *nfsi) |
| { |
| __pnfs_destroy_layout(nfsi); |
| } |
| EXPORT_SYMBOL_GPL(pnfs_destroy_layout); |
| |
| static bool pnfs_layout_removed(struct nfs_inode *nfsi, |
| struct pnfs_layout_hdr *lo) |
| { |
| bool ret; |
| |
| spin_lock(&nfsi->vfs_inode.i_lock); |
| ret = nfsi->layout != lo; |
| spin_unlock(&nfsi->vfs_inode.i_lock); |
| return ret; |
| } |
| |
| void pnfs_destroy_layout_final(struct nfs_inode *nfsi) |
| { |
| struct pnfs_layout_hdr *lo = __pnfs_destroy_layout(nfsi); |
| |
| if (lo) |
| wait_var_event(lo, pnfs_layout_removed(nfsi, lo)); |
| } |
| |
| static bool |
| pnfs_layout_add_bulk_destroy_list(struct inode *inode, |
| struct list_head *layout_list) |
| { |
| struct pnfs_layout_hdr *lo; |
| bool ret = false; |
| |
| spin_lock(&inode->i_lock); |
| lo = NFS_I(inode)->layout; |
| if (lo != NULL && list_empty(&lo->plh_bulk_destroy)) { |
| pnfs_get_layout_hdr(lo); |
| list_add(&lo->plh_bulk_destroy, layout_list); |
| ret = true; |
| } |
| spin_unlock(&inode->i_lock); |
| return ret; |
| } |
| |
| /* Caller must hold rcu_read_lock and clp->cl_lock */ |
| static int |
| pnfs_layout_bulk_destroy_byserver_locked(struct nfs_client *clp, |
| struct nfs_server *server, |
| struct list_head *layout_list) |
| __must_hold(&clp->cl_lock) |
| __must_hold(RCU) |
| { |
| struct pnfs_layout_hdr *lo, *next; |
| struct inode *inode; |
| |
| list_for_each_entry_safe(lo, next, &server->layouts, plh_layouts) { |
| if (test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags) || |
| test_bit(NFS_LAYOUT_INODE_FREEING, &lo->plh_flags) || |
| !list_empty(&lo->plh_bulk_destroy)) |
| continue; |
| /* If the sb is being destroyed, just bail */ |
| if (!nfs_sb_active(server->super)) |
| break; |
| inode = pnfs_grab_inode_layout_hdr(lo); |
| if (inode != NULL) { |
| if (pnfs_layout_add_bulk_destroy_list(inode, |
| layout_list)) |
| continue; |
| rcu_read_unlock(); |
| spin_unlock(&clp->cl_lock); |
| iput(inode); |
| } else { |
| rcu_read_unlock(); |
| spin_unlock(&clp->cl_lock); |
| } |
| nfs_sb_deactive(server->super); |
| spin_lock(&clp->cl_lock); |
| rcu_read_lock(); |
| return -EAGAIN; |
| } |
| return 0; |
| } |
| |
| static int |
| pnfs_layout_free_bulk_destroy_list(struct list_head *layout_list, |
| enum pnfs_layout_destroy_mode mode) |
| { |
| struct pnfs_layout_hdr *lo; |
| struct inode *inode; |
| LIST_HEAD(lseg_list); |
| int ret = 0; |
| |
| while (!list_empty(layout_list)) { |
| lo = list_entry(layout_list->next, struct pnfs_layout_hdr, |
| plh_bulk_destroy); |
| dprintk("%s freeing layout for inode %lu\n", __func__, |
| lo->plh_inode->i_ino); |
| inode = lo->plh_inode; |
| |
| pnfs_layoutcommit_inode(inode, false); |
| |
| spin_lock(&inode->i_lock); |
| list_del_init(&lo->plh_bulk_destroy); |
| if (mode == PNFS_LAYOUT_FILE_BULK_RETURN) { |
| pnfs_mark_layout_stateid_return(lo, &lseg_list, |
| IOMODE_ANY, 0); |
| } else if (pnfs_mark_layout_stateid_invalid(lo, &lseg_list)) { |
| if (mode == PNFS_LAYOUT_BULK_RETURN) |
| set_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags); |
| ret = -EAGAIN; |
| } |
| spin_unlock(&inode->i_lock); |
| pnfs_free_lseg_list(&lseg_list); |
| /* Free all lsegs that are attached to commit buckets */ |
| nfs_commit_inode(inode, 0); |
| pnfs_put_layout_hdr(lo); |
| nfs_iput_and_deactive(inode); |
| } |
| return ret; |
| } |
| |
| int pnfs_layout_destroy_byfsid(struct nfs_client *clp, struct nfs_fsid *fsid, |
| enum pnfs_layout_destroy_mode mode) |
| { |
| struct nfs_server *server; |
| LIST_HEAD(layout_list); |
| |
| spin_lock(&clp->cl_lock); |
| rcu_read_lock(); |
| restart: |
| list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { |
| if (memcmp(&server->fsid, fsid, sizeof(*fsid)) != 0) |
| continue; |
| if (pnfs_layout_bulk_destroy_byserver_locked(clp, |
| server, |
| &layout_list) != 0) |
| goto restart; |
| } |
| rcu_read_unlock(); |
| spin_unlock(&clp->cl_lock); |
| |
| return pnfs_layout_free_bulk_destroy_list(&layout_list, mode); |
| } |
| |
| static void pnfs_layout_build_destroy_list_byclient(struct nfs_client *clp, |
| struct list_head *list) |
| { |
| struct nfs_server *server; |
| |
| spin_lock(&clp->cl_lock); |
| rcu_read_lock(); |
| restart: |
| list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { |
| if (pnfs_layout_bulk_destroy_byserver_locked(clp, server, |
| list) != 0) |
| goto restart; |
| } |
| rcu_read_unlock(); |
| spin_unlock(&clp->cl_lock); |
| } |
| |
| static int pnfs_layout_do_destroy_byclid(struct nfs_client *clp, |
| struct list_head *list, |
| enum pnfs_layout_destroy_mode mode) |
| { |
| pnfs_layout_build_destroy_list_byclient(clp, list); |
| return pnfs_layout_free_bulk_destroy_list(list, mode); |
| } |
| |
| int pnfs_layout_destroy_byclid(struct nfs_client *clp, |
| enum pnfs_layout_destroy_mode mode) |
| { |
| LIST_HEAD(layout_list); |
| |
| return pnfs_layout_do_destroy_byclid(clp, &layout_list, mode); |
| } |
| |
| /* |
| * Called by the state manager to remove all layouts established under an |
| * expired lease. |
| */ |
| void |
| pnfs_destroy_all_layouts(struct nfs_client *clp) |
| { |
| nfs4_deviceid_mark_client_invalid(clp); |
| nfs4_deviceid_purge_client(clp); |
| |
| pnfs_layout_destroy_byclid(clp, PNFS_LAYOUT_INVALIDATE); |
| } |
| |
| static void pnfs_layout_build_recover_list_byclient(struct nfs_client *clp, |
| struct list_head *list) |
| { |
| struct nfs_server *server; |
| |
| spin_lock(&clp->cl_lock); |
| rcu_read_lock(); |
| restart: |
| list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { |
| if (!(server->caps & NFS_CAP_REBOOT_LAYOUTRETURN)) |
| continue; |
| if (pnfs_layout_bulk_destroy_byserver_locked(clp, server, |
| list) != 0) |
| goto restart; |
| } |
| rcu_read_unlock(); |
| spin_unlock(&clp->cl_lock); |
| } |
| |
| static int pnfs_layout_bulk_list_reboot(struct list_head *list) |
| { |
| struct pnfs_layout_hdr *lo; |
| struct nfs_server *server; |
| int ret; |
| |
| list_for_each_entry(lo, list, plh_bulk_destroy) { |
| server = NFS_SERVER(lo->plh_inode); |
| ret = pnfs_layout_return_on_reboot(lo); |
| switch (ret) { |
| case 0: |
| continue; |
| case -NFS4ERR_BAD_STATEID: |
| server->caps &= ~NFS_CAP_REBOOT_LAYOUTRETURN; |
| break; |
| case -NFS4ERR_NO_GRACE: |
| break; |
| default: |
| goto err; |
| } |
| break; |
| } |
| return 0; |
| err: |
| return ret; |
| } |
| |
| int pnfs_layout_handle_reboot(struct nfs_client *clp) |
| { |
| LIST_HEAD(list); |
| int ret = 0, ret2; |
| |
| pnfs_layout_build_recover_list_byclient(clp, &list); |
| if (!list_empty(&list)) |
| ret = pnfs_layout_bulk_list_reboot(&list); |
| ret2 = pnfs_layout_do_destroy_byclid(clp, &list, |
| PNFS_LAYOUT_INVALIDATE); |
| if (!ret) |
| ret = ret2; |
| return (ret == 0) ? 0 : -EAGAIN; |
| } |
| |
| static void |
| pnfs_set_layout_cred(struct pnfs_layout_hdr *lo, const struct cred *cred) |
| { |
| const struct cred *old; |
| |
| if (cred && cred_fscmp(lo->plh_lc_cred, cred) != 0) { |
| old = xchg(&lo->plh_lc_cred, get_cred(cred)); |
| put_cred(old); |
| } |
| } |
| |
| /* update lo->plh_stateid with new if is more recent */ |
| void |
| pnfs_set_layout_stateid(struct pnfs_layout_hdr *lo, const nfs4_stateid *new, |
| const struct cred *cred, bool update_barrier) |
| { |
| u32 oldseq = be32_to_cpu(lo->plh_stateid.seqid); |
| u32 newseq = be32_to_cpu(new->seqid); |
| |
| if (!pnfs_layout_is_valid(lo)) { |
| pnfs_set_layout_cred(lo, cred); |
| nfs4_stateid_copy(&lo->plh_stateid, new); |
| lo->plh_barrier = newseq; |
| pnfs_clear_layoutreturn_info(lo); |
| clear_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags); |
| return; |
| } |
| |
| if (pnfs_seqid_is_newer(newseq, oldseq)) |
| nfs4_stateid_copy(&lo->plh_stateid, new); |
| |
| if (update_barrier) { |
| pnfs_barrier_update(lo, newseq); |
| return; |
| } |
| /* |
| * Because of wraparound, we want to keep the barrier |
| * "close" to the current seqids. We really only want to |
| * get here from a layoutget call. |
| */ |
| if (atomic_read(&lo->plh_outstanding) == 1) |
| pnfs_barrier_update(lo, be32_to_cpu(lo->plh_stateid.seqid)); |
| } |
| |
| static bool |
| pnfs_layout_stateid_blocked(const struct pnfs_layout_hdr *lo, |
| const nfs4_stateid *stateid) |
| { |
| u32 seqid = be32_to_cpu(stateid->seqid); |
| |
| return lo->plh_barrier && pnfs_seqid_is_newer(lo->plh_barrier, seqid); |
| } |
| |
| /* lget is set to 1 if called from inside send_layoutget call chain */ |
| static bool |
| pnfs_layoutgets_blocked(const struct pnfs_layout_hdr *lo) |
| { |
| return lo->plh_block_lgets || |
| test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags); |
| } |
| |
| static struct nfs_server * |
| pnfs_find_server(struct inode *inode, struct nfs_open_context *ctx) |
| { |
| struct nfs_server *server; |
| |
| if (inode) { |
| server = NFS_SERVER(inode); |
| } else { |
| struct dentry *parent_dir = dget_parent(ctx->dentry); |
| server = NFS_SERVER(parent_dir->d_inode); |
| dput(parent_dir); |
| } |
| return server; |
| } |
| |
| static void nfs4_free_pages(struct page **pages, size_t size) |
| { |
| int i; |
| |
| if (!pages) |
| return; |
| |
| for (i = 0; i < size; i++) { |
| if (!pages[i]) |
| break; |
| __free_page(pages[i]); |
| } |
| kfree(pages); |
| } |
| |
| static struct page **nfs4_alloc_pages(size_t size, gfp_t gfp_flags) |
| { |
| struct page **pages; |
| int i; |
| |
| pages = kmalloc_array(size, sizeof(struct page *), gfp_flags); |
| if (!pages) { |
| dprintk("%s: can't alloc array of %zu pages\n", __func__, size); |
| return NULL; |
| } |
| |
| for (i = 0; i < size; i++) { |
| pages[i] = alloc_page(gfp_flags); |
| if (!pages[i]) { |
| dprintk("%s: failed to allocate page\n", __func__); |
| nfs4_free_pages(pages, i); |
| return NULL; |
| } |
| } |
| |
| return pages; |
| } |
| |
| static struct nfs4_layoutget * |
| pnfs_alloc_init_layoutget_args(struct inode *ino, |
| struct nfs_open_context *ctx, |
| const nfs4_stateid *stateid, |
| const struct pnfs_layout_range *range, |
| gfp_t gfp_flags) |
| { |
| struct nfs_server *server = pnfs_find_server(ino, ctx); |
| size_t max_reply_sz = server->pnfs_curr_ld->max_layoutget_response; |
| size_t max_pages = max_response_pages(server); |
| struct nfs4_layoutget *lgp; |
| |
| dprintk("--> %s\n", __func__); |
| |
| lgp = kzalloc(sizeof(*lgp), gfp_flags); |
| if (lgp == NULL) |
| return NULL; |
| |
| if (max_reply_sz) { |
| size_t npages = (max_reply_sz + PAGE_SIZE - 1) >> PAGE_SHIFT; |
| if (npages < max_pages) |
| max_pages = npages; |
| } |
| |
| lgp->args.layout.pages = nfs4_alloc_pages(max_pages, gfp_flags); |
| if (!lgp->args.layout.pages) { |
| kfree(lgp); |
| return NULL; |
| } |
| lgp->args.layout.pglen = max_pages * PAGE_SIZE; |
| lgp->res.layoutp = &lgp->args.layout; |
| |
| /* Don't confuse uninitialised result and success */ |
| lgp->res.status = -NFS4ERR_DELAY; |
| |
| lgp->args.minlength = PAGE_SIZE; |
| if (lgp->args.minlength > range->length) |
| lgp->args.minlength = range->length; |
| if (ino) { |
| loff_t i_size = i_size_read(ino); |
| |
| if (range->iomode == IOMODE_READ) { |
| if (range->offset >= i_size) |
| lgp->args.minlength = 0; |
| else if (i_size - range->offset < lgp->args.minlength) |
| lgp->args.minlength = i_size - range->offset; |
| } |
| } |
| lgp->args.maxcount = PNFS_LAYOUT_MAXSIZE; |
| pnfs_copy_range(&lgp->args.range, range); |
| lgp->args.type = server->pnfs_curr_ld->id; |
| lgp->args.inode = ino; |
| lgp->args.ctx = get_nfs_open_context(ctx); |
| nfs4_stateid_copy(&lgp->args.stateid, stateid); |
| lgp->gfp_flags = gfp_flags; |
| lgp->cred = ctx->cred; |
| return lgp; |
| } |
| |
| void pnfs_layoutget_free(struct nfs4_layoutget *lgp) |
| { |
| size_t max_pages = lgp->args.layout.pglen / PAGE_SIZE; |
| |
| nfs4_free_pages(lgp->args.layout.pages, max_pages); |
| pnfs_put_layout_hdr(lgp->lo); |
| put_nfs_open_context(lgp->args.ctx); |
| kfree(lgp); |
| } |
| |
| static void pnfs_clear_layoutcommit(struct inode *inode, |
| struct list_head *head) |
| { |
| struct nfs_inode *nfsi = NFS_I(inode); |
| struct pnfs_layout_segment *lseg, *tmp; |
| |
| if (!test_and_clear_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags)) |
| return; |
| list_for_each_entry_safe(lseg, tmp, &nfsi->layout->plh_segs, pls_list) { |
| if (!test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags)) |
| continue; |
| pnfs_lseg_dec_and_remove_zero(lseg, head); |
| } |
| } |
| |
| static void |
| pnfs_layoutreturn_retry_later_locked(struct pnfs_layout_hdr *lo, |
| const nfs4_stateid *arg_stateid, |
| const struct pnfs_layout_range *range) |
| { |
| const struct pnfs_layout_segment *lseg; |
| u32 seq = be32_to_cpu(arg_stateid->seqid); |
| |
| if (pnfs_layout_is_valid(lo) && |
| nfs4_stateid_match_other(&lo->plh_stateid, arg_stateid)) { |
| list_for_each_entry(lseg, &lo->plh_return_segs, pls_list) { |
| if (pnfs_seqid_is_newer(lseg->pls_seq, seq) || |
| !pnfs_should_free_range(&lseg->pls_range, range)) |
| continue; |
| pnfs_set_plh_return_info(lo, range->iomode, seq); |
| break; |
| } |
| } |
| } |
| |
| void pnfs_layoutreturn_retry_later(struct pnfs_layout_hdr *lo, |
| const nfs4_stateid *arg_stateid, |
| const struct pnfs_layout_range *range) |
| { |
| struct inode *inode = lo->plh_inode; |
| |
| spin_lock(&inode->i_lock); |
| pnfs_layoutreturn_retry_later_locked(lo, arg_stateid, range); |
| pnfs_clear_layoutreturn_waitbit(lo); |
| spin_unlock(&inode->i_lock); |
| } |
| |
| void pnfs_layoutreturn_free_lsegs(struct pnfs_layout_hdr *lo, |
| const nfs4_stateid *arg_stateid, |
| const struct pnfs_layout_range *range, |
| const nfs4_stateid *stateid) |
| { |
| struct inode *inode = lo->plh_inode; |
| LIST_HEAD(freeme); |
| |
| spin_lock(&inode->i_lock); |
| if (!nfs4_stateid_match_other(&lo->plh_stateid, arg_stateid)) |
| goto out_unlock; |
| if (stateid && pnfs_layout_is_valid(lo)) { |
| u32 seq = be32_to_cpu(arg_stateid->seqid); |
| |
| pnfs_mark_matching_lsegs_invalid(lo, &freeme, range, seq); |
| pnfs_free_returned_lsegs(lo, &freeme, range, seq); |
| pnfs_set_layout_stateid(lo, stateid, NULL, true); |
| } else |
| pnfs_mark_layout_stateid_invalid(lo, &freeme); |
| out_unlock: |
| pnfs_clear_layoutreturn_waitbit(lo); |
| spin_unlock(&inode->i_lock); |
| pnfs_free_lseg_list(&freeme); |
| |
| } |
| |
| static bool |
| pnfs_prepare_layoutreturn(struct pnfs_layout_hdr *lo, |
| nfs4_stateid *stateid, |
| const struct cred **cred, |
| enum pnfs_iomode *iomode) |
| { |
| /* Serialise LAYOUTGET/LAYOUTRETURN */ |
| if (atomic_read(&lo->plh_outstanding) != 0) |
| return false; |
| if (test_and_set_bit(NFS_LAYOUT_RETURN_LOCK, &lo->plh_flags)) |
| return false; |
| set_bit(NFS_LAYOUT_RETURN, &lo->plh_flags); |
| pnfs_get_layout_hdr(lo); |
| nfs4_stateid_copy(stateid, &lo->plh_stateid); |
| *cred = get_cred(lo->plh_lc_cred); |
| if (test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags)) { |
| if (lo->plh_return_seq != 0) |
| stateid->seqid = cpu_to_be32(lo->plh_return_seq); |
| if (iomode != NULL) |
| *iomode = lo->plh_return_iomode; |
| pnfs_clear_layoutreturn_info(lo); |
| } else if (iomode != NULL) |
| *iomode = IOMODE_ANY; |
| pnfs_barrier_update(lo, be32_to_cpu(stateid->seqid)); |
| return true; |
| } |
| |
| static void |
| pnfs_init_layoutreturn_args(struct nfs4_layoutreturn_args *args, |
| struct pnfs_layout_hdr *lo, |
| const nfs4_stateid *stateid, |
| enum pnfs_iomode iomode) |
| { |
| struct inode *inode = lo->plh_inode; |
| |
| args->layout_type = NFS_SERVER(inode)->pnfs_curr_ld->id; |
| args->inode = inode; |
| args->range.iomode = iomode; |
| args->range.offset = 0; |
| args->range.length = NFS4_MAX_UINT64; |
| args->layout = lo; |
| nfs4_stateid_copy(&args->stateid, stateid); |
| } |
| |
| static int |
| pnfs_send_layoutreturn(struct pnfs_layout_hdr *lo, |
| const nfs4_stateid *stateid, |
| const struct cred **pcred, |
| enum pnfs_iomode iomode, |
| unsigned int flags) |
| { |
| struct inode *ino = lo->plh_inode; |
| struct pnfs_layoutdriver_type *ld = NFS_SERVER(ino)->pnfs_curr_ld; |
| struct nfs4_layoutreturn *lrp; |
| const struct cred *cred = *pcred; |
| int status = 0; |
| |
| *pcred = NULL; |
| lrp = kzalloc(sizeof(*lrp), nfs_io_gfp_mask()); |
| if (unlikely(lrp == NULL)) { |
| status = -ENOMEM; |
| spin_lock(&ino->i_lock); |
| pnfs_clear_layoutreturn_waitbit(lo); |
| spin_unlock(&ino->i_lock); |
| put_cred(cred); |
| pnfs_put_layout_hdr(lo); |
| goto out; |
| } |
| |
| pnfs_init_layoutreturn_args(&lrp->args, lo, stateid, iomode); |
| lrp->args.ld_private = &lrp->ld_private; |
| lrp->clp = NFS_SERVER(ino)->nfs_client; |
| lrp->cred = cred; |
| if (ld->prepare_layoutreturn) |
| ld->prepare_layoutreturn(&lrp->args); |
| |
| status = nfs4_proc_layoutreturn(lrp, flags); |
| out: |
| dprintk("<-- %s status: %d\n", __func__, status); |
| return status; |
| } |
| |
| /* Return true if layoutreturn is needed */ |
| static bool |
| pnfs_layout_need_return(struct pnfs_layout_hdr *lo) |
| { |
| if (!test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags)) |
| return false; |
| return pnfs_mark_layout_stateid_return(lo, &lo->plh_return_segs, |
| lo->plh_return_iomode, |
| lo->plh_return_seq) != EBUSY; |
| } |
| |
| static void pnfs_layoutreturn_before_put_layout_hdr(struct pnfs_layout_hdr *lo) |
| { |
| struct inode *inode= lo->plh_inode; |
| |
| if (!test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags)) |
| return; |
| spin_lock(&inode->i_lock); |
| if (pnfs_layout_need_return(lo)) { |
| const struct cred *cred; |
| nfs4_stateid stateid; |
| enum pnfs_iomode iomode; |
| bool send; |
| |
| send = pnfs_prepare_layoutreturn(lo, &stateid, &cred, &iomode); |
| spin_unlock(&inode->i_lock); |
| if (send) { |
| /* Send an async layoutreturn so we dont deadlock */ |
| pnfs_send_layoutreturn(lo, &stateid, &cred, iomode, |
| PNFS_FL_LAYOUTRETURN_ASYNC); |
| } |
| } else |
| spin_unlock(&inode->i_lock); |
| } |
| |
| /* |
| * Initiates a LAYOUTRETURN(FILE), and removes the pnfs_layout_hdr |
| * when the layout segment list is empty. |
| * |
| * Note that a pnfs_layout_hdr can exist with an empty layout segment |
| * list when LAYOUTGET has failed, or when LAYOUTGET succeeded, but the |
| * deviceid is marked invalid. |
| */ |
| int |
| _pnfs_return_layout(struct inode *ino) |
| { |
| struct pnfs_layout_hdr *lo = NULL; |
| struct nfs_inode *nfsi = NFS_I(ino); |
| struct pnfs_layout_range range = { |
| .iomode = IOMODE_ANY, |
| .offset = 0, |
| .length = NFS4_MAX_UINT64, |
| }; |
| LIST_HEAD(tmp_list); |
| const struct cred *cred; |
| nfs4_stateid stateid; |
| int status = 0; |
| bool send, valid_layout; |
| |
| dprintk("NFS: %s for inode %lu\n", __func__, ino->i_ino); |
| |
| spin_lock(&ino->i_lock); |
| lo = nfsi->layout; |
| if (!lo) { |
| spin_unlock(&ino->i_lock); |
| dprintk("NFS: %s no layout to return\n", __func__); |
| goto out; |
| } |
| /* Reference matched in nfs4_layoutreturn_release */ |
| pnfs_get_layout_hdr(lo); |
| /* Is there an outstanding layoutreturn ? */ |
| if (test_bit(NFS_LAYOUT_RETURN_LOCK, &lo->plh_flags)) { |
| spin_unlock(&ino->i_lock); |
| if (wait_on_bit(&lo->plh_flags, NFS_LAYOUT_RETURN, |
| TASK_UNINTERRUPTIBLE)) |
| goto out_put_layout_hdr; |
| spin_lock(&ino->i_lock); |
| } |
| valid_layout = pnfs_layout_is_valid(lo); |
| pnfs_clear_layoutcommit(ino, &tmp_list); |
| pnfs_mark_matching_lsegs_return(lo, &tmp_list, &range, 0); |
| |
| if (NFS_SERVER(ino)->pnfs_curr_ld->return_range) |
| NFS_SERVER(ino)->pnfs_curr_ld->return_range(lo, &range); |
| |
| /* Don't send a LAYOUTRETURN if list was initially empty */ |
| if (!test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags) || |
| !valid_layout) { |
| spin_unlock(&ino->i_lock); |
| dprintk("NFS: %s no layout segments to return\n", __func__); |
| goto out_wait_layoutreturn; |
| } |
| |
| send = pnfs_prepare_layoutreturn(lo, &stateid, &cred, NULL); |
| spin_unlock(&ino->i_lock); |
| if (send) |
| status = pnfs_send_layoutreturn(lo, &stateid, &cred, IOMODE_ANY, |
| 0); |
| out_wait_layoutreturn: |
| wait_on_bit(&lo->plh_flags, NFS_LAYOUT_RETURN, TASK_UNINTERRUPTIBLE); |
| out_put_layout_hdr: |
| pnfs_free_lseg_list(&tmp_list); |
| pnfs_put_layout_hdr(lo); |
| out: |
| dprintk("<-- %s status: %d\n", __func__, status); |
| return status; |
| } |
| |
| int |
| pnfs_commit_and_return_layout(struct inode *inode) |
| { |
| struct pnfs_layout_hdr *lo; |
| int ret; |
| |
| spin_lock(&inode->i_lock); |
| lo = NFS_I(inode)->layout; |
| if (lo == NULL) { |
| spin_unlock(&inode->i_lock); |
| return 0; |
| } |
| pnfs_get_layout_hdr(lo); |
| /* Block new layoutgets and read/write to ds */ |
| lo->plh_block_lgets++; |
| spin_unlock(&inode->i_lock); |
| filemap_fdatawait(inode->i_mapping); |
| ret = pnfs_layoutcommit_inode(inode, true); |
| if (ret == 0) |
| ret = _pnfs_return_layout(inode); |
| spin_lock(&inode->i_lock); |
| lo->plh_block_lgets--; |
| spin_unlock(&inode->i_lock); |
| pnfs_put_layout_hdr(lo); |
| return ret; |
| } |
| |
| static int pnfs_layout_return_on_reboot(struct pnfs_layout_hdr *lo) |
| { |
| struct inode *inode = lo->plh_inode; |
| const struct cred *cred; |
| |
| spin_lock(&inode->i_lock); |
| if (!pnfs_layout_is_valid(lo)) { |
| spin_unlock(&inode->i_lock); |
| return 0; |
| } |
| cred = get_cred(lo->plh_lc_cred); |
| pnfs_get_layout_hdr(lo); |
| spin_unlock(&inode->i_lock); |
| |
| return pnfs_send_layoutreturn(lo, &zero_stateid, &cred, IOMODE_ANY, |
| PNFS_FL_LAYOUTRETURN_PRIVILEGED); |
| } |
| |
| bool pnfs_roc(struct inode *ino, |
| struct nfs4_layoutreturn_args *args, |
| struct nfs4_layoutreturn_res *res, |
| const struct cred *cred) |
| { |
| struct nfs_inode *nfsi = NFS_I(ino); |
| struct nfs_open_context *ctx; |
| struct nfs4_state *state; |
| struct pnfs_layout_hdr *lo; |
| struct pnfs_layout_segment *lseg, *next; |
| const struct cred *lc_cred; |
| nfs4_stateid stateid; |
| enum pnfs_iomode iomode = 0; |
| bool layoutreturn = false, roc = false; |
| bool skip_read = false; |
| |
| if (!nfs_have_layout(ino)) |
| return false; |
| retry: |
| rcu_read_lock(); |
| spin_lock(&ino->i_lock); |
| lo = nfsi->layout; |
| if (!lo || !pnfs_layout_is_valid(lo) || |
| test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags)) { |
| lo = NULL; |
| goto out_noroc; |
| } |
| pnfs_get_layout_hdr(lo); |
| if (test_bit(NFS_LAYOUT_RETURN_LOCK, &lo->plh_flags)) { |
| spin_unlock(&ino->i_lock); |
| rcu_read_unlock(); |
| wait_on_bit(&lo->plh_flags, NFS_LAYOUT_RETURN, |
| TASK_UNINTERRUPTIBLE); |
| pnfs_put_layout_hdr(lo); |
| goto retry; |
| } |
| |
| /* no roc if we hold a delegation */ |
| if (nfs4_check_delegation(ino, FMODE_READ)) { |
| if (nfs4_check_delegation(ino, FMODE_WRITE)) |
| goto out_noroc; |
| skip_read = true; |
| } |
| |
| list_for_each_entry_rcu(ctx, &nfsi->open_files, list) { |
| state = ctx->state; |
| if (state == NULL) |
| continue; |
| /* Don't return layout if there is open file state */ |
| if (state->state & FMODE_WRITE) |
| goto out_noroc; |
| if (state->state & FMODE_READ) |
| skip_read = true; |
| } |
| |
| |
| list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list) { |
| if (skip_read && lseg->pls_range.iomode == IOMODE_READ) |
| continue; |
| /* If we are sending layoutreturn, invalidate all valid lsegs */ |
| if (!test_and_clear_bit(NFS_LSEG_ROC, &lseg->pls_flags)) |
| continue; |
| /* |
| * Note: mark lseg for return so pnfs_layout_remove_lseg |
| * doesn't invalidate the layout for us. |
| */ |
| set_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags); |
| if (!mark_lseg_invalid(lseg, &lo->plh_return_segs)) |
| continue; |
| pnfs_set_plh_return_info(lo, lseg->pls_range.iomode, 0); |
| } |
| |
| if (!test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags)) |
| goto out_noroc; |
| |
| /* ROC in two conditions: |
| * 1. there are ROC lsegs |
| * 2. we don't send layoutreturn |
| */ |
| /* lo ref dropped in pnfs_roc_release() */ |
| layoutreturn = pnfs_prepare_layoutreturn(lo, &stateid, &lc_cred, &iomode); |
| /* If the creds don't match, we can't compound the layoutreturn */ |
| if (!layoutreturn || cred_fscmp(cred, lc_cred) != 0) |
| goto out_noroc; |
| |
| roc = layoutreturn; |
| pnfs_init_layoutreturn_args(args, lo, &stateid, iomode); |
| res->lrs_present = 0; |
| layoutreturn = false; |
| put_cred(lc_cred); |
| |
| out_noroc: |
| spin_unlock(&ino->i_lock); |
| rcu_read_unlock(); |
| pnfs_layoutcommit_inode(ino, true); |
| if (roc) { |
| struct pnfs_layoutdriver_type *ld = NFS_SERVER(ino)->pnfs_curr_ld; |
| if (ld->prepare_layoutreturn) |
| ld->prepare_layoutreturn(args); |
| pnfs_put_layout_hdr(lo); |
| return true; |
| } |
| if (layoutreturn) |
| pnfs_send_layoutreturn(lo, &stateid, &lc_cred, iomode, 0); |
| pnfs_put_layout_hdr(lo); |
| return false; |
| } |
| |
| int pnfs_roc_done(struct rpc_task *task, struct nfs4_layoutreturn_args **argpp, |
| struct nfs4_layoutreturn_res **respp, int *ret) |
| { |
| struct nfs4_layoutreturn_args *arg = *argpp; |
| int retval = -EAGAIN; |
| |
| if (!arg) |
| return 0; |
| /* Handle Layoutreturn errors */ |
| switch (*ret) { |
| case 0: |
| retval = 0; |
| break; |
| case -NFS4ERR_NOMATCHING_LAYOUT: |
| /* Was there an RPC level error? If not, retry */ |
| if (task->tk_rpc_status == 0) |
| break; |
| /* If the call was not sent, let caller handle it */ |
| if (!RPC_WAS_SENT(task)) |
| return 0; |
| /* |
| * Otherwise, assume the call succeeded and |
| * that we need to release the layout |
| */ |
| *ret = 0; |
| (*respp)->lrs_present = 0; |
| retval = 0; |
| break; |
| case -NFS4ERR_DELAY: |
| /* Let the caller handle the retry */ |
| *ret = -NFS4ERR_NOMATCHING_LAYOUT; |
| return 0; |
| case -NFS4ERR_OLD_STATEID: |
| if (!nfs4_layout_refresh_old_stateid(&arg->stateid, |
| &arg->range, arg->inode)) |
| break; |
| *ret = -NFS4ERR_NOMATCHING_LAYOUT; |
| return -EAGAIN; |
| } |
| *argpp = NULL; |
| *respp = NULL; |
| return retval; |
| } |
| |
| void pnfs_roc_release(struct nfs4_layoutreturn_args *args, |
| struct nfs4_layoutreturn_res *res, int ret) |
| { |
| struct pnfs_layout_hdr *lo = args->layout; |
| struct inode *inode = args->inode; |
| const nfs4_stateid *res_stateid = NULL; |
| struct nfs4_xdr_opaque_data *ld_private = args->ld_private; |
| |
| switch (ret) { |
| case -NFS4ERR_BADSESSION: |
| case -NFS4ERR_DEADSESSION: |
| case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: |
| case -NFS4ERR_NOMATCHING_LAYOUT: |
| spin_lock(&inode->i_lock); |
| pnfs_layoutreturn_retry_later_locked(lo, &args->stateid, |
| &args->range); |
| pnfs_clear_layoutreturn_waitbit(lo); |
| spin_unlock(&inode->i_lock); |
| break; |
| case 0: |
| if (res->lrs_present) |
| res_stateid = &res->stateid; |
| fallthrough; |
| default: |
| pnfs_layoutreturn_free_lsegs(lo, &args->stateid, &args->range, |
| res_stateid); |
| } |
| trace_nfs4_layoutreturn_on_close(args->inode, &args->stateid, ret); |
| if (ld_private && ld_private->ops && ld_private->ops->free) |
| ld_private->ops->free(ld_private); |
| pnfs_put_layout_hdr(lo); |
| } |
| |
| bool pnfs_wait_on_layoutreturn(struct inode *ino, struct rpc_task *task) |
| { |
| struct nfs_inode *nfsi = NFS_I(ino); |
| struct pnfs_layout_hdr *lo; |
| bool sleep = false; |
| |
| /* we might not have grabbed lo reference. so need to check under |
| * i_lock */ |
| spin_lock(&ino->i_lock); |
| lo = nfsi->layout; |
| if (lo && test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags)) { |
| rpc_sleep_on(&NFS_SERVER(ino)->roc_rpcwaitq, task, NULL); |
| sleep = true; |
| } |
| spin_unlock(&ino->i_lock); |
| return sleep; |
| } |
| |
| /* |
| * Compare two layout segments for sorting into layout cache. |
| * We want to preferentially return RW over RO layouts, so ensure those |
| * are seen first. |
| */ |
| static s64 |
| pnfs_lseg_range_cmp(const struct pnfs_layout_range *l1, |
| const struct pnfs_layout_range *l2) |
| { |
| s64 d; |
| |
| /* high offset > low offset */ |
| d = l1->offset - l2->offset; |
| if (d) |
| return d; |
| |
| /* short length > long length */ |
| d = l2->length - l1->length; |
| if (d) |
| return d; |
| |
| /* read > read/write */ |
| return (int)(l1->iomode == IOMODE_READ) - (int)(l2->iomode == IOMODE_READ); |
| } |
| |
| static bool |
| pnfs_lseg_range_is_after(const struct pnfs_layout_range *l1, |
| const struct pnfs_layout_range *l2) |
| { |
| return pnfs_lseg_range_cmp(l1, l2) > 0; |
| } |
| |
| static bool |
| pnfs_lseg_no_merge(struct pnfs_layout_segment *lseg, |
| struct pnfs_layout_segment *old) |
| { |
| return false; |
| } |
| |
| void |
| pnfs_generic_layout_insert_lseg(struct pnfs_layout_hdr *lo, |
| struct pnfs_layout_segment *lseg, |
| bool (*is_after)(const struct pnfs_layout_range *, |
| const struct pnfs_layout_range *), |
| bool (*do_merge)(struct pnfs_layout_segment *, |
| struct pnfs_layout_segment *), |
| struct list_head *free_me) |
| { |
| struct pnfs_layout_segment *lp, *tmp; |
| |
| dprintk("%s:Begin\n", __func__); |
| |
| list_for_each_entry_safe(lp, tmp, &lo->plh_segs, pls_list) { |
| if (test_bit(NFS_LSEG_VALID, &lp->pls_flags) == 0) |
| continue; |
| if (do_merge(lseg, lp)) { |
| mark_lseg_invalid(lp, free_me); |
| continue; |
| } |
| if (is_after(&lseg->pls_range, &lp->pls_range)) |
| continue; |
| list_add_tail(&lseg->pls_list, &lp->pls_list); |
| dprintk("%s: inserted lseg %p " |
| "iomode %d offset %llu length %llu before " |
| "lp %p iomode %d offset %llu length %llu\n", |
| __func__, lseg, lseg->pls_range.iomode, |
| lseg->pls_range.offset, lseg->pls_range.length, |
| lp, lp->pls_range.iomode, lp->pls_range.offset, |
| lp->pls_range.length); |
| goto out; |
| } |
| list_add_tail(&lseg->pls_list, &lo->plh_segs); |
| dprintk("%s: inserted lseg %p " |
| "iomode %d offset %llu length %llu at tail\n", |
| __func__, lseg, lseg->pls_range.iomode, |
| lseg->pls_range.offset, lseg->pls_range.length); |
| out: |
| pnfs_get_layout_hdr(lo); |
| |
| dprintk("%s:Return\n", __func__); |
| } |
| EXPORT_SYMBOL_GPL(pnfs_generic_layout_insert_lseg); |
| |
| static void |
| pnfs_layout_insert_lseg(struct pnfs_layout_hdr *lo, |
| struct pnfs_layout_segment *lseg, |
| struct list_head *free_me) |
| { |
| struct inode *inode = lo->plh_inode; |
| struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld; |
| |
| if (ld->add_lseg != NULL) |
| ld->add_lseg(lo, lseg, free_me); |
| else |
| pnfs_generic_layout_insert_lseg(lo, lseg, |
| pnfs_lseg_range_is_after, |
| pnfs_lseg_no_merge, |
| free_me); |
| } |
| |
| static struct pnfs_layout_hdr * |
| alloc_init_layout_hdr(struct inode *ino, |
| struct nfs_open_context *ctx, |
| gfp_t gfp_flags) |
| { |
| struct pnfs_layout_hdr *lo; |
| |
| lo = pnfs_alloc_layout_hdr(ino, gfp_flags); |
| if (!lo) |
| return NULL; |
| refcount_set(&lo->plh_refcount, 1); |
| INIT_LIST_HEAD(&lo->plh_layouts); |
| INIT_LIST_HEAD(&lo->plh_segs); |
| INIT_LIST_HEAD(&lo->plh_return_segs); |
| INIT_LIST_HEAD(&lo->plh_bulk_destroy); |
| lo->plh_inode = ino; |
| lo->plh_lc_cred = get_cred(ctx->cred); |
| lo->plh_flags |= 1 << NFS_LAYOUT_INVALID_STID; |
| return lo; |
| } |
| |
| static struct pnfs_layout_hdr * |
| pnfs_find_alloc_layout(struct inode *ino, |
| struct nfs_open_context *ctx, |
| gfp_t gfp_flags) |
| __releases(&ino->i_lock) |
| __acquires(&ino->i_lock) |
| { |
| struct nfs_inode *nfsi = NFS_I(ino); |
| struct pnfs_layout_hdr *new = NULL; |
| |
| dprintk("%s Begin ino=%p layout=%p\n", __func__, ino, nfsi->layout); |
| |
| if (nfsi->layout != NULL) |
| goto out_existing; |
| spin_unlock(&ino->i_lock); |
| new = alloc_init_layout_hdr(ino, ctx, gfp_flags); |
| spin_lock(&ino->i_lock); |
| |
| if (likely(nfsi->layout == NULL)) { /* Won the race? */ |
| nfsi->layout = new; |
| return new; |
| } else if (new != NULL) |
| pnfs_free_layout_hdr(new); |
| out_existing: |
| pnfs_get_layout_hdr(nfsi->layout); |
| return nfsi->layout; |
| } |
| |
| /* |
| * iomode matching rules: |
| * iomode lseg strict match |
| * iomode |
| * ----- ----- ------ ----- |
| * ANY READ N/A true |
| * ANY RW N/A true |
| * RW READ N/A false |
| * RW RW N/A true |
| * READ READ N/A true |
| * READ RW true false |
| * READ RW false true |
| */ |
| static bool |
| pnfs_lseg_range_match(const struct pnfs_layout_range *ls_range, |
| const struct pnfs_layout_range *range, |
| bool strict_iomode) |
| { |
| struct pnfs_layout_range range1; |
| |
| if ((range->iomode == IOMODE_RW && |
| ls_range->iomode != IOMODE_RW) || |
| (range->iomode != ls_range->iomode && |
| strict_iomode) || |
| !pnfs_lseg_range_intersecting(ls_range, range)) |
| return false; |
| |
| /* range1 covers only the first byte in the range */ |
| range1 = *range; |
| range1.length = 1; |
| return pnfs_lseg_range_contained(ls_range, &range1); |
| } |
| |
| /* |
| * lookup range in layout |
| */ |
| static struct pnfs_layout_segment * |
| pnfs_find_lseg(struct pnfs_layout_hdr *lo, |
| struct pnfs_layout_range *range, |
| bool strict_iomode) |
| { |
| struct pnfs_layout_segment *lseg, *ret = NULL; |
| |
| dprintk("%s:Begin\n", __func__); |
| |
| list_for_each_entry(lseg, &lo->plh_segs, pls_list) { |
| if (test_bit(NFS_LSEG_VALID, &lseg->pls_flags) && |
| pnfs_lseg_range_match(&lseg->pls_range, range, |
| strict_iomode)) { |
| ret = pnfs_get_lseg(lseg); |
| break; |
| } |
| } |
| |
| dprintk("%s:Return lseg %p ref %d\n", |
| __func__, ret, ret ? refcount_read(&ret->pls_refcount) : 0); |
| return ret; |
| } |
| |
| /* |
| * Use mdsthreshold hints set at each OPEN to determine if I/O should go |
| * to the MDS or over pNFS |
| * |
| * The nfs_inode read_io and write_io fields are cumulative counters reset |
| * when there are no layout segments. Note that in pnfs_update_layout iomode |
| * is set to IOMODE_READ for a READ request, and set to IOMODE_RW for a |
| * WRITE request. |
| * |
| * A return of true means use MDS I/O. |
| * |
| * From rfc 5661: |
| * If a file's size is smaller than the file size threshold, data accesses |
| * SHOULD be sent to the metadata server. If an I/O request has a length that |
| * is below the I/O size threshold, the I/O SHOULD be sent to the metadata |
| * server. If both file size and I/O size are provided, the client SHOULD |
| * reach or exceed both thresholds before sending its read or write |
| * requests to the data server. |
| */ |
| static bool pnfs_within_mdsthreshold(struct nfs_open_context *ctx, |
| struct inode *ino, int iomode) |
| { |
| struct nfs4_threshold *t = ctx->mdsthreshold; |
| struct nfs_inode *nfsi = NFS_I(ino); |
| loff_t fsize = i_size_read(ino); |
| bool size = false, size_set = false, io = false, io_set = false, ret = false; |
| |
| if (t == NULL) |
| return ret; |
| |
| dprintk("%s bm=0x%x rd_sz=%llu wr_sz=%llu rd_io=%llu wr_io=%llu\n", |
| __func__, t->bm, t->rd_sz, t->wr_sz, t->rd_io_sz, t->wr_io_sz); |
| |
| switch (iomode) { |
| case IOMODE_READ: |
| if (t->bm & THRESHOLD_RD) { |
| dprintk("%s fsize %llu\n", __func__, fsize); |
| size_set = true; |
| if (fsize < t->rd_sz) |
| size = true; |
| } |
| if (t->bm & THRESHOLD_RD_IO) { |
| dprintk("%s nfsi->read_io %llu\n", __func__, |
| nfsi->read_io); |
| io_set = true; |
| if (nfsi->read_io < t->rd_io_sz) |
| io = true; |
| } |
| break; |
| case IOMODE_RW: |
| if (t->bm & THRESHOLD_WR) { |
| dprintk("%s fsize %llu\n", __func__, fsize); |
| size_set = true; |
| if (fsize < t->wr_sz) |
| size = true; |
| } |
| if (t->bm & THRESHOLD_WR_IO) { |
| dprintk("%s nfsi->write_io %llu\n", __func__, |
| nfsi->write_io); |
| io_set = true; |
| if (nfsi->write_io < t->wr_io_sz) |
| io = true; |
| } |
| break; |
| } |
| if (size_set && io_set) { |
| if (size && io) |
| ret = true; |
| } else if (size || io) |
| ret = true; |
| |
| dprintk("<-- %s size %d io %d ret %d\n", __func__, size, io, ret); |
| return ret; |
| } |
| |
| static int pnfs_prepare_to_retry_layoutget(struct pnfs_layout_hdr *lo) |
| { |
| /* |
| * send layoutcommit as it can hold up layoutreturn due to lseg |
| * reference |
| */ |
| pnfs_layoutcommit_inode(lo->plh_inode, false); |
| return wait_on_bit_action(&lo->plh_flags, NFS_LAYOUT_RETURN, |
| nfs_wait_bit_killable, |
| TASK_KILLABLE|TASK_FREEZABLE_UNSAFE); |
| } |
| |
| static void nfs_layoutget_begin(struct pnfs_layout_hdr *lo) |
| { |
| atomic_inc(&lo->plh_outstanding); |
| } |
| |
| static void nfs_layoutget_end(struct pnfs_layout_hdr *lo) |
| { |
| if (atomic_dec_and_test(&lo->plh_outstanding) && |
| test_and_clear_bit(NFS_LAYOUT_DRAIN, &lo->plh_flags)) |
| wake_up_bit(&lo->plh_flags, NFS_LAYOUT_DRAIN); |
| } |
| |
| static bool pnfs_is_first_layoutget(struct pnfs_layout_hdr *lo) |
| { |
| return test_bit(NFS_LAYOUT_FIRST_LAYOUTGET, &lo->plh_flags); |
| } |
| |
| static void pnfs_clear_first_layoutget(struct pnfs_layout_hdr *lo) |
| { |
| unsigned long *bitlock = &lo->plh_flags; |
| |
| clear_bit_unlock(NFS_LAYOUT_FIRST_LAYOUTGET, bitlock); |
| smp_mb__after_atomic(); |
| wake_up_bit(bitlock, NFS_LAYOUT_FIRST_LAYOUTGET); |
| } |
| |
| static void _add_to_server_list(struct pnfs_layout_hdr *lo, |
| struct nfs_server *server) |
| { |
| if (!test_and_set_bit(NFS_LAYOUT_HASHED, &lo->plh_flags)) { |
| struct nfs_client *clp = server->nfs_client; |
| |
| /* The lo must be on the clp list if there is any |
| * chance of a CB_LAYOUTRECALL(FILE) coming in. |
| */ |
| spin_lock(&clp->cl_lock); |
| list_add_tail_rcu(&lo->plh_layouts, &server->layouts); |
| spin_unlock(&clp->cl_lock); |
| } |
| } |
| |
| /* |
| * Layout segment is retreived from the server if not cached. |
| * The appropriate layout segment is referenced and returned to the caller. |
| */ |
| struct pnfs_layout_segment * |
| pnfs_update_layout(struct inode *ino, |
| struct nfs_open_context *ctx, |
| loff_t pos, |
| u64 count, |
| enum pnfs_iomode iomode, |
| bool strict_iomode, |
| gfp_t gfp_flags) |
| { |
| struct pnfs_layout_range arg = { |
| .iomode = iomode, |
| .offset = pos, |
| .length = count, |
| }; |
| unsigned pg_offset; |
| struct nfs_server *server = NFS_SERVER(ino); |
| struct nfs_client *clp = server->nfs_client; |
| struct pnfs_layout_hdr *lo = NULL; |
| struct pnfs_layout_segment *lseg = NULL; |
| struct nfs4_layoutget *lgp; |
| nfs4_stateid stateid; |
| struct nfs4_exception exception = { |
| .inode = ino, |
| }; |
| unsigned long giveup = jiffies + (clp->cl_lease_time << 1); |
| bool first; |
| |
| if (!pnfs_enabled_sb(NFS_SERVER(ino))) { |
| trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg, |
| PNFS_UPDATE_LAYOUT_NO_PNFS); |
| goto out; |
| } |
| |
| if (pnfs_within_mdsthreshold(ctx, ino, iomode)) { |
| trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg, |
| PNFS_UPDATE_LAYOUT_MDSTHRESH); |
| goto out; |
| } |
| |
| lookup_again: |
| if (!nfs4_valid_open_stateid(ctx->state)) { |
| trace_pnfs_update_layout(ino, pos, count, |
| iomode, lo, lseg, |
| PNFS_UPDATE_LAYOUT_INVALID_OPEN); |
| lseg = ERR_PTR(-EIO); |
| goto out; |
| } |
| |
| lseg = ERR_PTR(nfs4_client_recover_expired_lease(clp)); |
| if (IS_ERR(lseg)) |
| goto out; |
| first = false; |
| spin_lock(&ino->i_lock); |
| lo = pnfs_find_alloc_layout(ino, ctx, gfp_flags); |
| if (lo == NULL) { |
| spin_unlock(&ino->i_lock); |
| lseg = ERR_PTR(-ENOMEM); |
| trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg, |
| PNFS_UPDATE_LAYOUT_NOMEM); |
| goto out; |
| } |
| |
| /* Do we even need to bother with this? */ |
| if (test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags)) { |
| trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg, |
| PNFS_UPDATE_LAYOUT_BULK_RECALL); |
| dprintk("%s matches recall, use MDS\n", __func__); |
| goto out_unlock; |
| } |
| |
| /* if LAYOUTGET already failed once we don't try again */ |
| if (pnfs_layout_io_test_failed(lo, iomode)) { |
| trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg, |
| PNFS_UPDATE_LAYOUT_IO_TEST_FAIL); |
| goto out_unlock; |
| } |
| |
| /* |
| * If the layout segment list is empty, but there are outstanding |
| * layoutget calls, then they might be subject to a layoutrecall. |
| */ |
| if (test_bit(NFS_LAYOUT_DRAIN, &lo->plh_flags) && |
| atomic_read(&lo->plh_outstanding) != 0) { |
| spin_unlock(&ino->i_lock); |
| lseg = ERR_PTR(wait_on_bit(&lo->plh_flags, NFS_LAYOUT_DRAIN, |
| TASK_KILLABLE)); |
| if (IS_ERR(lseg)) |
| goto out_put_layout_hdr; |
| pnfs_put_layout_hdr(lo); |
| goto lookup_again; |
| } |
| |
| /* |
| * Because we free lsegs when sending LAYOUTRETURN, we need to wait |
| * for LAYOUTRETURN. |
| */ |
| if (test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags)) { |
| spin_unlock(&ino->i_lock); |
| dprintk("%s wait for layoutreturn\n", __func__); |
| lseg = ERR_PTR(pnfs_prepare_to_retry_layoutget(lo)); |
| if (!IS_ERR(lseg)) { |
| pnfs_put_layout_hdr(lo); |
| dprintk("%s retrying\n", __func__); |
| trace_pnfs_update_layout(ino, pos, count, iomode, lo, |
| lseg, |
| PNFS_UPDATE_LAYOUT_RETRY); |
| goto lookup_again; |
| } |
| trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg, |
| PNFS_UPDATE_LAYOUT_RETURN); |
| goto out_put_layout_hdr; |
| } |
| |
| lseg = pnfs_find_lseg(lo, &arg, strict_iomode); |
| if (lseg) { |
| trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg, |
| PNFS_UPDATE_LAYOUT_FOUND_CACHED); |
| goto out_unlock; |
| } |
| |
| /* |
| * Choose a stateid for the LAYOUTGET. If we don't have a layout |
| * stateid, or it has been invalidated, then we must use the open |
| * stateid. |
| */ |
| if (test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags)) { |
| int status; |
| |
| /* |
| * The first layoutget for the file. Need to serialize per |
| * RFC 5661 Errata 3208. |
| */ |
| if (test_and_set_bit(NFS_LAYOUT_FIRST_LAYOUTGET, |
| &lo->plh_flags)) { |
| spin_unlock(&ino->i_lock); |
| lseg = ERR_PTR(wait_on_bit(&lo->plh_flags, |
| NFS_LAYOUT_FIRST_LAYOUTGET, |
| TASK_KILLABLE)); |
| if (IS_ERR(lseg)) |
| goto out_put_layout_hdr; |
| pnfs_put_layout_hdr(lo); |
| dprintk("%s retrying\n", __func__); |
| goto lookup_again; |
| } |
| |
| spin_unlock(&ino->i_lock); |
| first = true; |
| status = nfs4_select_rw_stateid(ctx->state, |
| iomode == IOMODE_RW ? FMODE_WRITE : FMODE_READ, |
| NULL, &stateid, NULL); |
| if (status != 0) { |
| lseg = ERR_PTR(status); |
| trace_pnfs_update_layout(ino, pos, count, |
| iomode, lo, lseg, |
| PNFS_UPDATE_LAYOUT_INVALID_OPEN); |
| nfs4_schedule_stateid_recovery(server, ctx->state); |
| pnfs_clear_first_layoutget(lo); |
| pnfs_put_layout_hdr(lo); |
| goto lookup_again; |
| } |
| spin_lock(&ino->i_lock); |
| } else { |
| nfs4_stateid_copy(&stateid, &lo->plh_stateid); |
| } |
| |
| if (pnfs_layoutgets_blocked(lo)) { |
| trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg, |
| PNFS_UPDATE_LAYOUT_BLOCKED); |
| goto out_unlock; |
| } |
| nfs_layoutget_begin(lo); |
| spin_unlock(&ino->i_lock); |
| |
| _add_to_server_list(lo, server); |
| |
| pg_offset = arg.offset & ~PAGE_MASK; |
| if (pg_offset) { |
| arg.offset -= pg_offset; |
| arg.length += pg_offset; |
| } |
| if (arg.length != NFS4_MAX_UINT64) |
| arg.length = PAGE_ALIGN(arg.length); |
| |
| lgp = pnfs_alloc_init_layoutget_args(ino, ctx, &stateid, &arg, gfp_flags); |
| if (!lgp) { |
| lseg = ERR_PTR(-ENOMEM); |
| trace_pnfs_update_layout(ino, pos, count, iomode, lo, NULL, |
| PNFS_UPDATE_LAYOUT_NOMEM); |
| nfs_layoutget_end(lo); |
| goto out_put_layout_hdr; |
| } |
| |
| lgp->lo = lo; |
| pnfs_get_layout_hdr(lo); |
| |
| lseg = nfs4_proc_layoutget(lgp, &exception); |
| trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg, |
| PNFS_UPDATE_LAYOUT_SEND_LAYOUTGET); |
| nfs_layoutget_end(lo); |
| if (IS_ERR(lseg)) { |
| switch(PTR_ERR(lseg)) { |
| case -EBUSY: |
| if (time_after(jiffies, giveup)) |
| lseg = NULL; |
| break; |
| case -ERECALLCONFLICT: |
| case -EAGAIN: |
| break; |
| case -ENODATA: |
| /* The server returned NFS4ERR_LAYOUTUNAVAILABLE */ |
| pnfs_layout_set_fail_bit( |
| lo, pnfs_iomode_to_fail_bit(iomode)); |
| lseg = NULL; |
| goto out_put_layout_hdr; |
| default: |
| if (!nfs_error_is_fatal(PTR_ERR(lseg))) { |
| pnfs_layout_clear_fail_bit(lo, pnfs_iomode_to_fail_bit(iomode)); |
| lseg = NULL; |
| } |
| goto out_put_layout_hdr; |
| } |
| if (lseg) { |
| if (!exception.retry) |
| goto out_put_layout_hdr; |
| if (first) |
| pnfs_clear_first_layoutget(lo); |
| trace_pnfs_update_layout(ino, pos, count, |
| iomode, lo, lseg, PNFS_UPDATE_LAYOUT_RETRY); |
| pnfs_put_layout_hdr(lo); |
| goto lookup_again; |
| } |
| } else { |
| pnfs_layout_clear_fail_bit(lo, pnfs_iomode_to_fail_bit(iomode)); |
| } |
| |
| out_put_layout_hdr: |
| if (first) |
| pnfs_clear_first_layoutget(lo); |
| trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg, |
| PNFS_UPDATE_LAYOUT_EXIT); |
| pnfs_put_layout_hdr(lo); |
| out: |
| dprintk("%s: inode %s/%llu pNFS layout segment %s for " |
| "(%s, offset: %llu, length: %llu)\n", |
| __func__, ino->i_sb->s_id, |
| (unsigned long long)NFS_FILEID(ino), |
| IS_ERR_OR_NULL(lseg) ? "not found" : "found", |
| iomode==IOMODE_RW ? "read/write" : "read-only", |
| (unsigned long long)pos, |
| (unsigned long long)count); |
| return lseg; |
| out_unlock: |
| spin_unlock(&ino->i_lock); |
| goto out_put_layout_hdr; |
| } |
| EXPORT_SYMBOL_GPL(pnfs_update_layout); |
| |
| static bool |
| pnfs_sanity_check_layout_range(struct pnfs_layout_range *range) |
| { |
| switch (range->iomode) { |
| case IOMODE_READ: |
| case IOMODE_RW: |
| break; |
| default: |
| return false; |
| } |
| if (range->offset == NFS4_MAX_UINT64) |
| return false; |
| if (range->length == 0) |
| return false; |
| if (range->length != NFS4_MAX_UINT64 && |
| range->length > NFS4_MAX_UINT64 - range->offset) |
| return false; |
| return true; |
| } |
| |
| static struct pnfs_layout_hdr * |
| _pnfs_grab_empty_layout(struct inode *ino, struct nfs_open_context *ctx) |
| { |
| struct pnfs_layout_hdr *lo; |
| |
| spin_lock(&ino->i_lock); |
| lo = pnfs_find_alloc_layout(ino, ctx, nfs_io_gfp_mask()); |
| if (!lo) |
| goto out_unlock; |
| if (!test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags)) |
| goto out_unlock; |
| if (test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags)) |
| goto out_unlock; |
| if (pnfs_layoutgets_blocked(lo)) |
| goto out_unlock; |
| if (test_and_set_bit(NFS_LAYOUT_FIRST_LAYOUTGET, &lo->plh_flags)) |
| goto out_unlock; |
| nfs_layoutget_begin(lo); |
| spin_unlock(&ino->i_lock); |
| _add_to_server_list(lo, NFS_SERVER(ino)); |
| return lo; |
| |
| out_unlock: |
| spin_unlock(&ino->i_lock); |
| pnfs_put_layout_hdr(lo); |
| return NULL; |
| } |
| |
| static void _lgopen_prepare_attached(struct nfs4_opendata *data, |
| struct nfs_open_context *ctx) |
| { |
| struct inode *ino = data->dentry->d_inode; |
| struct pnfs_layout_range rng = { |
| .iomode = (data->o_arg.fmode & FMODE_WRITE) ? |
| IOMODE_RW: IOMODE_READ, |
| .offset = 0, |
| .length = NFS4_MAX_UINT64, |
| }; |
| struct nfs4_layoutget *lgp; |
| struct pnfs_layout_hdr *lo; |
| |
| /* Heuristic: don't send layoutget if we have cached data */ |
| if (rng.iomode == IOMODE_READ && |
| (i_size_read(ino) == 0 || ino->i_mapping->nrpages != 0)) |
| return; |
| |
| lo = _pnfs_grab_empty_layout(ino, ctx); |
| if (!lo) |
| return; |
| lgp = pnfs_alloc_init_layoutget_args(ino, ctx, ¤t_stateid, &rng, |
| nfs_io_gfp_mask()); |
| if (!lgp) { |
| pnfs_clear_first_layoutget(lo); |
| nfs_layoutget_end(lo); |
| pnfs_put_layout_hdr(lo); |
| return; |
| } |
| lgp->lo = lo; |
| data->lgp = lgp; |
| data->o_arg.lg_args = &lgp->args; |
| data->o_res.lg_res = &lgp->res; |
| } |
| |
| static void _lgopen_prepare_floating(struct nfs4_opendata *data, |
| struct nfs_open_context *ctx) |
| { |
| struct inode *ino = data->dentry->d_inode; |
| struct pnfs_layout_range rng = { |
| .iomode = (data->o_arg.fmode & FMODE_WRITE) ? |
| IOMODE_RW: IOMODE_READ, |
| .offset = 0, |
| .length = NFS4_MAX_UINT64, |
| }; |
| struct nfs4_layoutget *lgp; |
| |
| lgp = pnfs_alloc_init_layoutget_args(ino, ctx, ¤t_stateid, &rng, |
| nfs_io_gfp_mask()); |
| if (!lgp) |
| return; |
| data->lgp = lgp; |
| data->o_arg.lg_args = &lgp->args; |
| data->o_res.lg_res = &lgp->res; |
| } |
| |
| void pnfs_lgopen_prepare(struct nfs4_opendata *data, |
| struct nfs_open_context *ctx) |
| { |
| struct nfs_server *server = NFS_SERVER(data->dir->d_inode); |
| |
| if (!(pnfs_enabled_sb(server) && |
| server->pnfs_curr_ld->flags & PNFS_LAYOUTGET_ON_OPEN)) |
| return; |
| /* Could check on max_ops, but currently hardcoded high enough */ |
| if (!nfs_server_capable(data->dir->d_inode, NFS_CAP_LGOPEN)) |
| return; |
| if (data->lgp) |
| return; |
| if (data->state) |
| _lgopen_prepare_attached(data, ctx); |
| else |
| _lgopen_prepare_floating(data, ctx); |
| } |
| |
| void pnfs_parse_lgopen(struct inode *ino, struct nfs4_layoutget *lgp, |
| struct nfs_open_context *ctx) |
| { |
| struct pnfs_layout_hdr *lo; |
| struct pnfs_layout_segment *lseg; |
| struct nfs_server *srv = NFS_SERVER(ino); |
| u32 iomode; |
| |
| if (!lgp) |
| return; |
| dprintk("%s: entered with status %i\n", __func__, lgp->res.status); |
| if (lgp->res.status) { |
| switch (lgp->res.status) { |
| default: |
| break; |
| /* |
| * Halt lgopen attempts if the server doesn't recognise |
| * the "current stateid" value, the layout type, or the |
| * layoutget operation as being valid. |
| * Also if it complains about too many ops in the compound |
| * or of the request/reply being too big. |
| */ |
| case -NFS4ERR_BAD_STATEID: |
| case -NFS4ERR_NOTSUPP: |
| case -NFS4ERR_REP_TOO_BIG: |
| case -NFS4ERR_REP_TOO_BIG_TO_CACHE: |
| case -NFS4ERR_REQ_TOO_BIG: |
| case -NFS4ERR_TOO_MANY_OPS: |
| case -NFS4ERR_UNKNOWN_LAYOUTTYPE: |
| srv->caps &= ~NFS_CAP_LGOPEN; |
| } |
| return; |
| } |
| if (!lgp->lo) { |
| lo = _pnfs_grab_empty_layout(ino, ctx); |
| if (!lo) |
| return; |
| lgp->lo = lo; |
| } else |
| lo = lgp->lo; |
| |
| lseg = pnfs_layout_process(lgp); |
| if (!IS_ERR(lseg)) { |
| iomode = lgp->args.range.iomode; |
| pnfs_layout_clear_fail_bit(lo, pnfs_iomode_to_fail_bit(iomode)); |
| pnfs_put_lseg(lseg); |
| } |
| } |
| |
| void nfs4_lgopen_release(struct nfs4_layoutget *lgp) |
| { |
| if (lgp != NULL) { |
| if (lgp->lo) { |
| pnfs_clear_first_layoutget(lgp->lo); |
| nfs_layoutget_end(lgp->lo); |
| } |
| pnfs_layoutget_free(lgp); |
| } |
| } |
| |
| struct pnfs_layout_segment * |
| pnfs_layout_process(struct nfs4_layoutget *lgp) |
| { |
| struct pnfs_layout_hdr *lo = lgp->lo; |
| struct nfs4_layoutget_res *res = &lgp->res; |
| struct pnfs_layout_segment *lseg; |
| struct inode *ino = lo->plh_inode; |
| LIST_HEAD(free_me); |
| |
| if (!pnfs_sanity_check_layout_range(&res->range)) |
| return ERR_PTR(-EINVAL); |
| |
| /* Inject layout blob into I/O device driver */ |
| lseg = NFS_SERVER(ino)->pnfs_curr_ld->alloc_lseg(lo, res, lgp->gfp_flags); |
| if (IS_ERR_OR_NULL(lseg)) { |
| if (!lseg) |
| lseg = ERR_PTR(-ENOMEM); |
| |
| dprintk("%s: Could not allocate layout: error %ld\n", |
| __func__, PTR_ERR(lseg)); |
| return lseg; |
| } |
| |
| pnfs_init_lseg(lo, lseg, &res->range, &res->stateid); |
| |
| spin_lock(&ino->i_lock); |
| if (pnfs_layoutgets_blocked(lo)) { |
| dprintk("%s forget reply due to state\n", __func__); |
| goto out_forget; |
| } |
| |
| if (test_bit(NFS_LAYOUT_DRAIN, &lo->plh_flags) && |
| !pnfs_is_first_layoutget(lo)) |
| goto out_forget; |
| |
| if (nfs4_stateid_match_other(&lo->plh_stateid, &res->stateid)) { |
| /* existing state ID, make sure the sequence number matches. */ |
| if (pnfs_layout_stateid_blocked(lo, &res->stateid)) { |
| if (!pnfs_layout_is_valid(lo)) |
| lo->plh_barrier = 0; |
| dprintk("%s forget reply due to sequence\n", __func__); |
| goto out_forget; |
| } |
| pnfs_set_layout_stateid(lo, &res->stateid, lgp->cred, false); |
| } else if (pnfs_layout_is_valid(lo)) { |
| /* |
| * We got an entirely new state ID. Mark all segments for the |
| * inode invalid, and retry the layoutget |
| */ |
| struct pnfs_layout_range range = { |
| .iomode = IOMODE_ANY, |
| .length = NFS4_MAX_UINT64, |
| }; |
| pnfs_mark_matching_lsegs_return(lo, &free_me, &range, 0); |
| goto out_forget; |
| } else { |
| /* We have a completely new layout */ |
| pnfs_set_layout_stateid(lo, &res->stateid, lgp->cred, true); |
| } |
| |
| pnfs_get_lseg(lseg); |
| pnfs_layout_insert_lseg(lo, lseg, &free_me); |
| |
| |
| if (res->return_on_close) |
| set_bit(NFS_LSEG_ROC, &lseg->pls_flags); |
| |
| spin_unlock(&ino->i_lock); |
| pnfs_free_lseg_list(&free_me); |
| return lseg; |
| |
| out_forget: |
| spin_unlock(&ino->i_lock); |
| lseg->pls_layout = lo; |
| NFS_SERVER(ino)->pnfs_curr_ld->free_lseg(lseg); |
| return ERR_PTR(-EAGAIN); |
| } |
| |
| /** |
| * pnfs_mark_matching_lsegs_return - Free or return matching layout segments |
| * @lo: pointer to layout header |
| * @tmp_list: list header to be used with pnfs_free_lseg_list() |
| * @return_range: describe layout segment ranges to be returned |
| * @seq: stateid seqid to match |
| * |
| * This function is mainly intended for use by layoutrecall. It attempts |
| * to free the layout segment immediately, or else to mark it for return |
| * as soon as its reference count drops to zero. |
| * |
| * Returns |
| * - 0: a layoutreturn needs to be scheduled. |
| * - EBUSY: there are layout segment that are still in use. |
| * - ENOENT: there are no layout segments that need to be returned. |
| */ |
| int |
| pnfs_mark_matching_lsegs_return(struct pnfs_layout_hdr *lo, |
| struct list_head *tmp_list, |
| const struct pnfs_layout_range *return_range, |
| u32 seq) |
| { |
| struct pnfs_layout_segment *lseg, *next; |
| struct nfs_server *server = NFS_SERVER(lo->plh_inode); |
| int remaining = 0; |
| |
| dprintk("%s:Begin lo %p\n", __func__, lo); |
| |
| assert_spin_locked(&lo->plh_inode->i_lock); |
| |
| if (test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags)) |
| tmp_list = &lo->plh_return_segs; |
| |
| list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list) |
| if (pnfs_match_lseg_recall(lseg, return_range, seq)) { |
| dprintk("%s: marking lseg %p iomode %d " |
| "offset %llu length %llu\n", __func__, |
| lseg, lseg->pls_range.iomode, |
| lseg->pls_range.offset, |
| lseg->pls_range.length); |
| if (test_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags)) |
| tmp_list = &lo->plh_return_segs; |
| if (mark_lseg_invalid(lseg, tmp_list)) |
| continue; |
| remaining++; |
| set_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags); |
| pnfs_lseg_cancel_io(server, lseg); |
| } |
| |
| if (remaining) { |
| pnfs_set_plh_return_info(lo, return_range->iomode, seq); |
| return -EBUSY; |
| } |
| |
| if (!list_empty(&lo->plh_return_segs)) { |
| pnfs_set_plh_return_info(lo, return_range->iomode, seq); |
| return 0; |
| } |
| |
| return -ENOENT; |
| } |
| |
| static void |
| pnfs_mark_layout_for_return(struct inode *inode, |
| const struct pnfs_layout_range *range) |
| { |
| struct pnfs_layout_hdr *lo; |
| bool return_now = false; |
| |
| spin_lock(&inode->i_lock); |
| lo = NFS_I(inode)->layout; |
| if (!pnfs_layout_is_valid(lo)) { |
| spin_unlock(&inode->i_lock); |
| return; |
| } |
| pnfs_set_plh_return_info(lo, range->iomode, 0); |
| /* |
| * mark all matching lsegs so that we are sure to have no live |
| * segments at hand when sending layoutreturn. See pnfs_put_lseg() |
| * for how it works. |
| */ |
| if (pnfs_mark_matching_lsegs_return(lo, &lo->plh_return_segs, range, 0) != -EBUSY) { |
| const struct cred *cred; |
| nfs4_stateid stateid; |
| enum pnfs_iomode iomode; |
| |
| return_now = pnfs_prepare_layoutreturn(lo, &stateid, &cred, &iomode); |
| spin_unlock(&inode->i_lock); |
| if (return_now) |
| pnfs_send_layoutreturn(lo, &stateid, &cred, iomode, |
| PNFS_FL_LAYOUTRETURN_ASYNC); |
| } else { |
| spin_unlock(&inode->i_lock); |
| nfs_commit_inode(inode, 0); |
| } |
| } |
| |
| void pnfs_error_mark_layout_for_return(struct inode *inode, |
| struct pnfs_layout_segment *lseg) |
| { |
| struct pnfs_layout_range range = { |
| .iomode = lseg->pls_range.iomode, |
| .offset = 0, |
| .length = NFS4_MAX_UINT64, |
| }; |
| |
| pnfs_mark_layout_for_return(inode, &range); |
| } |
| EXPORT_SYMBOL_GPL(pnfs_error_mark_layout_for_return); |
| |
| static bool |
| pnfs_layout_can_be_returned(struct pnfs_layout_hdr *lo) |
| { |
| return pnfs_layout_is_valid(lo) && |
| !test_bit(NFS_LAYOUT_INODE_FREEING, &lo->plh_flags) && |
| !test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags); |
| } |
| |
| static struct pnfs_layout_segment * |
| pnfs_find_first_lseg(struct pnfs_layout_hdr *lo, |
| const struct pnfs_layout_range *range, |
| enum pnfs_iomode iomode) |
| { |
| struct pnfs_layout_segment *lseg; |
| |
| list_for_each_entry(lseg, &lo->plh_segs, pls_list) { |
| if (!test_bit(NFS_LSEG_VALID, &lseg->pls_flags)) |
| continue; |
| if (test_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags)) |
| continue; |
| if (lseg->pls_range.iomode != iomode && iomode != IOMODE_ANY) |
| continue; |
| if (pnfs_lseg_range_intersecting(&lseg->pls_range, range)) |
| return lseg; |
| } |
| return NULL; |
| } |
| |
| /* Find open file states whose mode matches that of the range */ |
| static bool |
| pnfs_should_return_unused_layout(struct pnfs_layout_hdr *lo, |
| const struct pnfs_layout_range *range) |
| { |
| struct list_head *head; |
| struct nfs_open_context *ctx; |
| fmode_t mode = 0; |
| |
| if (!pnfs_layout_can_be_returned(lo) || |
| !pnfs_find_first_lseg(lo, range, range->iomode)) |
| return false; |
| |
| head = &NFS_I(lo->plh_inode)->open_files; |
| list_for_each_entry_rcu(ctx, head, list) { |
| if (ctx->state) |
| mode |= ctx->state->state & (FMODE_READ|FMODE_WRITE); |
| } |
| |
| switch (range->iomode) { |
| default: |
| break; |
| case IOMODE_READ: |
| mode &= ~FMODE_WRITE; |
| break; |
| case IOMODE_RW: |
| if (pnfs_find_first_lseg(lo, range, IOMODE_READ)) |
| mode &= ~FMODE_READ; |
| } |
| return mode == 0; |
| } |
| |
| static int pnfs_layout_return_unused_byserver(struct nfs_server *server, |
| void *data) |
| { |
| const struct pnfs_layout_range *range = data; |
| const struct cred *cred; |
| struct pnfs_layout_hdr *lo; |
| struct inode *inode; |
| nfs4_stateid stateid; |
| enum pnfs_iomode iomode; |
| |
| restart: |
| rcu_read_lock(); |
| list_for_each_entry_rcu(lo, &server->layouts, plh_layouts) { |
| inode = lo->plh_inode; |
| if (!inode || !pnfs_layout_can_be_returned(lo) || |
| test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags)) |
| continue; |
| spin_lock(&inode->i_lock); |
| if (!lo->plh_inode || |
| !pnfs_should_return_unused_layout(lo, range)) { |
| spin_unlock(&inode->i_lock); |
| continue; |
| } |
| pnfs_get_layout_hdr(lo); |
| pnfs_set_plh_return_info(lo, range->iomode, 0); |
| if (pnfs_mark_matching_lsegs_return(lo, &lo->plh_return_segs, |
| range, 0) != 0 || |
| !pnfs_prepare_layoutreturn(lo, &stateid, &cred, &iomode)) { |
| spin_unlock(&inode->i_lock); |
| rcu_read_unlock(); |
| pnfs_put_layout_hdr(lo); |
| cond_resched(); |
| goto restart; |
| } |
| spin_unlock(&inode->i_lock); |
| rcu_read_unlock(); |
| pnfs_send_layoutreturn(lo, &stateid, &cred, iomode, |
| PNFS_FL_LAYOUTRETURN_ASYNC); |
| pnfs_put_layout_hdr(lo); |
| cond_resched(); |
| goto restart; |
| } |
| rcu_read_unlock(); |
| return 0; |
| } |
| |
| void |
| pnfs_layout_return_unused_byclid(struct nfs_client *clp, |
| enum pnfs_iomode iomode) |
| { |
| struct pnfs_layout_range range = { |
| .iomode = iomode, |
| .offset = 0, |
| .length = NFS4_MAX_UINT64, |
| }; |
| |
| nfs_client_for_each_server(clp, pnfs_layout_return_unused_byserver, |
| &range); |
| } |
| |
| /* Check if we have we have a valid layout but if there isn't an intersection |
| * between the request and the pgio->pg_lseg, put this pgio->pg_lseg away. |
| */ |
| void |
| pnfs_generic_pg_check_layout(struct nfs_pageio_descriptor *pgio, |
| struct nfs_page *req) |
| { |
| if (pgio->pg_lseg == NULL || |
| (test_bit(NFS_LSEG_VALID, &pgio->pg_lseg->pls_flags) && |
| pnfs_lseg_request_intersecting(pgio->pg_lseg, req))) |
| return; |
| pnfs_put_lseg(pgio->pg_lseg); |
| pgio->pg_lseg = NULL; |
| } |
| EXPORT_SYMBOL_GPL(pnfs_generic_pg_check_layout); |
| |
| void |
| pnfs_generic_pg_init_read(struct nfs_pageio_descriptor *pgio, struct nfs_page *req) |
| { |
| u64 rd_size; |
| |
| pnfs_generic_pg_check_layout(pgio, req); |
| if (pgio->pg_lseg == NULL) { |
| if (pgio->pg_dreq == NULL) |
| rd_size = i_size_read(pgio->pg_inode) - req_offset(req); |
| else |
| rd_size = nfs_dreq_bytes_left(pgio->pg_dreq, |
| req_offset(req)); |
| |
| pgio->pg_lseg = |
| pnfs_update_layout(pgio->pg_inode, nfs_req_openctx(req), |
| req_offset(req), rd_size, |
| IOMODE_READ, false, |
| nfs_io_gfp_mask()); |
| if (IS_ERR(pgio->pg_lseg)) { |
| pgio->pg_error = PTR_ERR(pgio->pg_lseg); |
| pgio->pg_lseg = NULL; |
| return; |
| } |
| } |
| /* If no lseg, fall back to read through mds */ |
| if (pgio->pg_lseg == NULL) |
| nfs_pageio_reset_read_mds(pgio); |
| |
| } |
| EXPORT_SYMBOL_GPL(pnfs_generic_pg_init_read); |
| |
| void |
| pnfs_generic_pg_init_write(struct nfs_pageio_descriptor *pgio, |
| struct nfs_page *req, u64 wb_size) |
| { |
| pnfs_generic_pg_check_layout(pgio, req); |
| if (pgio->pg_lseg == NULL) { |
| pgio->pg_lseg = |
| pnfs_update_layout(pgio->pg_inode, nfs_req_openctx(req), |
| req_offset(req), wb_size, IOMODE_RW, |
| false, nfs_io_gfp_mask()); |
| if (IS_ERR(pgio->pg_lseg)) { |
| pgio->pg_error = PTR_ERR(pgio->pg_lseg); |
| pgio->pg_lseg = NULL; |
| return; |
| } |
| } |
| /* If no lseg, fall back to write through mds */ |
| if (pgio->pg_lseg == NULL) |
| nfs_pageio_reset_write_mds(pgio); |
| } |
| EXPORT_SYMBOL_GPL(pnfs_generic_pg_init_write); |
| |
| void |
| pnfs_generic_pg_cleanup(struct nfs_pageio_descriptor *desc) |
| { |
| if (desc->pg_lseg) { |
| pnfs_put_lseg(desc->pg_lseg); |
| desc->pg_lseg = NULL; |
| } |
| } |
| EXPORT_SYMBOL_GPL(pnfs_generic_pg_cleanup); |
| |
| /* |
| * Return 0 if @req cannot be coalesced into @pgio, otherwise return the number |
| * of bytes (maximum @req->wb_bytes) that can be coalesced. |
| */ |
| size_t |
| pnfs_generic_pg_test(struct nfs_pageio_descriptor *pgio, |
| struct nfs_page *prev, struct nfs_page *req) |
| { |
| unsigned int size; |
| u64 seg_end, req_start, seg_left; |
| |
| size = nfs_generic_pg_test(pgio, prev, req); |
| if (!size) |
| return 0; |
| |
| /* |
| * 'size' contains the number of bytes left in the current page (up |
| * to the original size asked for in @req->wb_bytes). |
| * |
| * Calculate how many bytes are left in the layout segment |
| * and if there are less bytes than 'size', return that instead. |
| * |
| * Please also note that 'end_offset' is actually the offset of the |
| * first byte that lies outside the pnfs_layout_range. FIXME? |
| * |
| */ |
| if (pgio->pg_lseg) { |
| seg_end = pnfs_end_offset(pgio->pg_lseg->pls_range.offset, |
| pgio->pg_lseg->pls_range.length); |
| req_start = req_offset(req); |
| |
| /* start of request is past the last byte of this segment */ |
| if (req_start >= seg_end) |
| return 0; |
| |
| /* adjust 'size' iff there are fewer bytes left in the |
| * segment than what nfs_generic_pg_test returned */ |
| seg_left = seg_end - req_start; |
| if (seg_left < size) |
| size = (unsigned int)seg_left; |
| } |
| |
| return size; |
| } |
| EXPORT_SYMBOL_GPL(pnfs_generic_pg_test); |
| |
| int pnfs_write_done_resend_to_mds(struct nfs_pgio_header *hdr) |
| { |
| struct nfs_pageio_descriptor pgio; |
| |
| /* Resend all requests through the MDS */ |
| nfs_pageio_init_write(&pgio, hdr->inode, FLUSH_STABLE, true, |
| hdr->completion_ops); |
| return nfs_pageio_resend(&pgio, hdr); |
| } |
| EXPORT_SYMBOL_GPL(pnfs_write_done_resend_to_mds); |
| |
| static void pnfs_ld_handle_write_error(struct nfs_pgio_header *hdr) |
| { |
| |
| dprintk("pnfs write error = %d\n", hdr->pnfs_error); |
| if (NFS_SERVER(hdr->inode)->pnfs_curr_ld->flags & |
| PNFS_LAYOUTRET_ON_ERROR) { |
| pnfs_return_layout(hdr->inode); |
| } |
| if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) |
| hdr->task.tk_status = pnfs_write_done_resend_to_mds(hdr); |
| } |
| |
| /* |
| * Called by non rpc-based layout drivers |
| */ |
| void pnfs_ld_write_done(struct nfs_pgio_header *hdr) |
| { |
| if (likely(!hdr->pnfs_error)) { |
| pnfs_set_layoutcommit(hdr->inode, hdr->lseg, |
| hdr->mds_offset + hdr->res.count); |
| hdr->mds_ops->rpc_call_done(&hdr->task, hdr); |
| } |
| trace_nfs4_pnfs_write(hdr, hdr->pnfs_error); |
| if (unlikely(hdr->pnfs_error)) |
| pnfs_ld_handle_write_error(hdr); |
| hdr->mds_ops->rpc_release(hdr); |
| } |
| EXPORT_SYMBOL_GPL(pnfs_ld_write_done); |
| |
| static void |
| pnfs_write_through_mds(struct nfs_pageio_descriptor *desc, |
| struct nfs_pgio_header *hdr) |
| { |
| struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc); |
| |
| if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) { |
| list_splice_tail_init(&hdr->pages, &mirror->pg_list); |
| nfs_pageio_reset_write_mds(desc); |
| mirror->pg_recoalesce = 1; |
| } |
| hdr->completion_ops->completion(hdr); |
| } |
| |
| static enum pnfs_try_status |
| pnfs_try_to_write_data(struct nfs_pgio_header *hdr, |
| const struct rpc_call_ops *call_ops, |
| struct pnfs_layout_segment *lseg, |
| int how) |
| { |
| struct inode *inode = hdr->inode; |
| enum pnfs_try_status trypnfs; |
| struct nfs_server *nfss = NFS_SERVER(inode); |
| |
| hdr->mds_ops = call_ops; |
| |
| dprintk("%s: Writing ino:%lu %u@%llu (how %d)\n", __func__, |
| inode->i_ino, hdr->args.count, hdr->args.offset, how); |
| trypnfs = nfss->pnfs_curr_ld->write_pagelist(hdr, how); |
| if (trypnfs != PNFS_NOT_ATTEMPTED) |
| nfs_inc_stats(inode, NFSIOS_PNFS_WRITE); |
| dprintk("%s End (trypnfs:%d)\n", __func__, trypnfs); |
| return trypnfs; |
| } |
| |
| static void |
| pnfs_do_write(struct nfs_pageio_descriptor *desc, |
| struct nfs_pgio_header *hdr, int how) |
| { |
| const struct rpc_call_ops *call_ops = desc->pg_rpc_callops; |
| struct pnfs_layout_segment *lseg = desc->pg_lseg; |
| enum pnfs_try_status trypnfs; |
| |
| trypnfs = pnfs_try_to_write_data(hdr, call_ops, lseg, how); |
| switch (trypnfs) { |
| case PNFS_NOT_ATTEMPTED: |
| pnfs_write_through_mds(desc, hdr); |
| break; |
| case PNFS_ATTEMPTED: |
| break; |