![Huang Ying](/assets/img/avatar_default.png)
After using the offset of the swap entry as the key of the swap cache, the page_index() becomes exactly same as page_file_index(). So the page_file_index() is removed and the callers are changed to use page_index() instead. Link: http://lkml.kernel.org/r/1473270649-27229-2-git-send-email-ying.huang@intel.com Signed-off-by: "Huang, Ying" <ying.huang@intel.com> Cc: Trond Myklebust <trond.myklebust@primarydata.com> Cc: Anna Schumaker <anna.schumaker@netapp.com> Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> Cc: Michal Hocko <mhocko@suse.com> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Dan Williams <dan.j.williams@intel.com> Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com> Cc: Ross Zwisler <ross.zwisler@linux.intel.com> Cc: Eric Dumazet <edumazet@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
1293 lines
33 KiB
C
1293 lines
33 KiB
C
/*
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* linux/fs/nfs/pagelist.c
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*
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* A set of helper functions for managing NFS read and write requests.
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* The main purpose of these routines is to provide support for the
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* coalescing of several requests into a single RPC call.
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*
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* Copyright 2000, 2001 (c) Trond Myklebust <trond.myklebust@fys.uio.no>
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*
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*/
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#include <linux/slab.h>
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#include <linux/file.h>
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#include <linux/sched.h>
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#include <linux/sunrpc/clnt.h>
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#include <linux/nfs.h>
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#include <linux/nfs3.h>
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#include <linux/nfs4.h>
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#include <linux/nfs_page.h>
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#include <linux/nfs_fs.h>
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#include <linux/nfs_mount.h>
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#include <linux/export.h>
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#include "internal.h"
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#include "pnfs.h"
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#define NFSDBG_FACILITY NFSDBG_PAGECACHE
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static struct kmem_cache *nfs_page_cachep;
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static const struct rpc_call_ops nfs_pgio_common_ops;
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static bool nfs_pgarray_set(struct nfs_page_array *p, unsigned int pagecount)
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{
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p->npages = pagecount;
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if (pagecount <= ARRAY_SIZE(p->page_array))
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p->pagevec = p->page_array;
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else {
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p->pagevec = kcalloc(pagecount, sizeof(struct page *), GFP_KERNEL);
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if (!p->pagevec)
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p->npages = 0;
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}
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return p->pagevec != NULL;
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}
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struct nfs_pgio_mirror *
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nfs_pgio_current_mirror(struct nfs_pageio_descriptor *desc)
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{
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return nfs_pgio_has_mirroring(desc) ?
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&desc->pg_mirrors[desc->pg_mirror_idx] :
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&desc->pg_mirrors[0];
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}
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EXPORT_SYMBOL_GPL(nfs_pgio_current_mirror);
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void nfs_pgheader_init(struct nfs_pageio_descriptor *desc,
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struct nfs_pgio_header *hdr,
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void (*release)(struct nfs_pgio_header *hdr))
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{
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struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc);
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hdr->req = nfs_list_entry(mirror->pg_list.next);
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hdr->inode = desc->pg_inode;
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hdr->cred = hdr->req->wb_context->cred;
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hdr->io_start = req_offset(hdr->req);
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hdr->good_bytes = mirror->pg_count;
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hdr->dreq = desc->pg_dreq;
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hdr->layout_private = desc->pg_layout_private;
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hdr->release = release;
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hdr->completion_ops = desc->pg_completion_ops;
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if (hdr->completion_ops->init_hdr)
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hdr->completion_ops->init_hdr(hdr);
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hdr->pgio_mirror_idx = desc->pg_mirror_idx;
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}
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EXPORT_SYMBOL_GPL(nfs_pgheader_init);
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void nfs_set_pgio_error(struct nfs_pgio_header *hdr, int error, loff_t pos)
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{
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spin_lock(&hdr->lock);
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if (!test_and_set_bit(NFS_IOHDR_ERROR, &hdr->flags)
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|| pos < hdr->io_start + hdr->good_bytes) {
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clear_bit(NFS_IOHDR_EOF, &hdr->flags);
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hdr->good_bytes = pos - hdr->io_start;
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hdr->error = error;
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}
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spin_unlock(&hdr->lock);
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}
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static inline struct nfs_page *
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nfs_page_alloc(void)
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{
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struct nfs_page *p = kmem_cache_zalloc(nfs_page_cachep, GFP_NOIO);
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if (p)
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INIT_LIST_HEAD(&p->wb_list);
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return p;
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}
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static inline void
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nfs_page_free(struct nfs_page *p)
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{
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kmem_cache_free(nfs_page_cachep, p);
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}
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/**
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* nfs_iocounter_wait - wait for i/o to complete
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* @l_ctx: nfs_lock_context with io_counter to use
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*
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* returns -ERESTARTSYS if interrupted by a fatal signal.
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* Otherwise returns 0 once the io_count hits 0.
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*/
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int
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nfs_iocounter_wait(struct nfs_lock_context *l_ctx)
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{
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return wait_on_atomic_t(&l_ctx->io_count, nfs_wait_atomic_killable,
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TASK_KILLABLE);
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}
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/*
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* nfs_page_group_lock - lock the head of the page group
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* @req - request in group that is to be locked
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* @nonblock - if true don't block waiting for lock
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*
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* this lock must be held if modifying the page group list
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*
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* return 0 on success, < 0 on error: -EDELAY if nonblocking or the
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* result from wait_on_bit_lock
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*
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* NOTE: calling with nonblock=false should always have set the
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* lock bit (see fs/buffer.c and other uses of wait_on_bit_lock
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* with TASK_UNINTERRUPTIBLE), so there is no need to check the result.
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*/
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int
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nfs_page_group_lock(struct nfs_page *req, bool nonblock)
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{
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struct nfs_page *head = req->wb_head;
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WARN_ON_ONCE(head != head->wb_head);
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if (!test_and_set_bit(PG_HEADLOCK, &head->wb_flags))
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return 0;
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if (!nonblock)
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return wait_on_bit_lock(&head->wb_flags, PG_HEADLOCK,
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TASK_UNINTERRUPTIBLE);
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return -EAGAIN;
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}
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/*
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* nfs_page_group_lock_wait - wait for the lock to clear, but don't grab it
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* @req - a request in the group
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*
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* This is a blocking call to wait for the group lock to be cleared.
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*/
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void
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nfs_page_group_lock_wait(struct nfs_page *req)
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{
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struct nfs_page *head = req->wb_head;
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WARN_ON_ONCE(head != head->wb_head);
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wait_on_bit(&head->wb_flags, PG_HEADLOCK,
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TASK_UNINTERRUPTIBLE);
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}
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/*
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* nfs_page_group_unlock - unlock the head of the page group
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* @req - request in group that is to be unlocked
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*/
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void
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nfs_page_group_unlock(struct nfs_page *req)
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{
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struct nfs_page *head = req->wb_head;
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WARN_ON_ONCE(head != head->wb_head);
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smp_mb__before_atomic();
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clear_bit(PG_HEADLOCK, &head->wb_flags);
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smp_mb__after_atomic();
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wake_up_bit(&head->wb_flags, PG_HEADLOCK);
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}
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/*
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* nfs_page_group_sync_on_bit_locked
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*
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* must be called with page group lock held
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*/
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static bool
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nfs_page_group_sync_on_bit_locked(struct nfs_page *req, unsigned int bit)
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{
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struct nfs_page *head = req->wb_head;
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struct nfs_page *tmp;
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WARN_ON_ONCE(!test_bit(PG_HEADLOCK, &head->wb_flags));
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WARN_ON_ONCE(test_and_set_bit(bit, &req->wb_flags));
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tmp = req->wb_this_page;
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while (tmp != req) {
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if (!test_bit(bit, &tmp->wb_flags))
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return false;
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tmp = tmp->wb_this_page;
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}
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/* true! reset all bits */
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tmp = req;
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do {
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clear_bit(bit, &tmp->wb_flags);
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tmp = tmp->wb_this_page;
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} while (tmp != req);
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return true;
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}
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/*
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* nfs_page_group_sync_on_bit - set bit on current request, but only
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* return true if the bit is set for all requests in page group
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* @req - request in page group
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* @bit - PG_* bit that is used to sync page group
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*/
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bool nfs_page_group_sync_on_bit(struct nfs_page *req, unsigned int bit)
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{
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bool ret;
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nfs_page_group_lock(req, false);
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ret = nfs_page_group_sync_on_bit_locked(req, bit);
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nfs_page_group_unlock(req);
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return ret;
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}
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/*
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* nfs_page_group_init - Initialize the page group linkage for @req
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* @req - a new nfs request
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* @prev - the previous request in page group, or NULL if @req is the first
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* or only request in the group (the head).
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*/
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static inline void
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nfs_page_group_init(struct nfs_page *req, struct nfs_page *prev)
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{
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struct inode *inode;
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WARN_ON_ONCE(prev == req);
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if (!prev) {
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/* a head request */
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req->wb_head = req;
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req->wb_this_page = req;
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} else {
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/* a subrequest */
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WARN_ON_ONCE(prev->wb_this_page != prev->wb_head);
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WARN_ON_ONCE(!test_bit(PG_HEADLOCK, &prev->wb_head->wb_flags));
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req->wb_head = prev->wb_head;
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req->wb_this_page = prev->wb_this_page;
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prev->wb_this_page = req;
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/* All subrequests take a ref on the head request until
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* nfs_page_group_destroy is called */
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kref_get(&req->wb_head->wb_kref);
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/* grab extra ref and bump the request count if head request
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* has extra ref from the write/commit path to handle handoff
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* between write and commit lists. */
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if (test_bit(PG_INODE_REF, &prev->wb_head->wb_flags)) {
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inode = page_file_mapping(req->wb_page)->host;
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set_bit(PG_INODE_REF, &req->wb_flags);
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kref_get(&req->wb_kref);
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spin_lock(&inode->i_lock);
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NFS_I(inode)->nrequests++;
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spin_unlock(&inode->i_lock);
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}
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}
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}
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/*
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* nfs_page_group_destroy - sync the destruction of page groups
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* @req - request that no longer needs the page group
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*
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* releases the page group reference from each member once all
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* members have called this function.
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*/
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static void
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nfs_page_group_destroy(struct kref *kref)
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{
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struct nfs_page *req = container_of(kref, struct nfs_page, wb_kref);
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struct nfs_page *tmp, *next;
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/* subrequests must release the ref on the head request */
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if (req->wb_head != req)
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nfs_release_request(req->wb_head);
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if (!nfs_page_group_sync_on_bit(req, PG_TEARDOWN))
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return;
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tmp = req;
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do {
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next = tmp->wb_this_page;
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/* unlink and free */
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tmp->wb_this_page = tmp;
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tmp->wb_head = tmp;
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nfs_free_request(tmp);
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tmp = next;
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} while (tmp != req);
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}
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/**
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* nfs_create_request - Create an NFS read/write request.
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* @ctx: open context to use
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* @page: page to write
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* @last: last nfs request created for this page group or NULL if head
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* @offset: starting offset within the page for the write
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* @count: number of bytes to read/write
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*
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* The page must be locked by the caller. This makes sure we never
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* create two different requests for the same page.
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* User should ensure it is safe to sleep in this function.
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*/
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struct nfs_page *
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nfs_create_request(struct nfs_open_context *ctx, struct page *page,
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struct nfs_page *last, unsigned int offset,
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unsigned int count)
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{
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struct nfs_page *req;
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struct nfs_lock_context *l_ctx;
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if (test_bit(NFS_CONTEXT_BAD, &ctx->flags))
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return ERR_PTR(-EBADF);
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/* try to allocate the request struct */
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req = nfs_page_alloc();
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if (req == NULL)
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return ERR_PTR(-ENOMEM);
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/* get lock context early so we can deal with alloc failures */
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l_ctx = nfs_get_lock_context(ctx);
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if (IS_ERR(l_ctx)) {
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nfs_page_free(req);
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return ERR_CAST(l_ctx);
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}
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req->wb_lock_context = l_ctx;
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atomic_inc(&l_ctx->io_count);
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/* Initialize the request struct. Initially, we assume a
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* long write-back delay. This will be adjusted in
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* update_nfs_request below if the region is not locked. */
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req->wb_page = page;
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if (page) {
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req->wb_index = page_index(page);
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get_page(page);
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}
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req->wb_offset = offset;
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req->wb_pgbase = offset;
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req->wb_bytes = count;
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req->wb_context = get_nfs_open_context(ctx);
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kref_init(&req->wb_kref);
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nfs_page_group_init(req, last);
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return req;
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}
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/**
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* nfs_unlock_request - Unlock request and wake up sleepers.
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* @req:
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*/
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void nfs_unlock_request(struct nfs_page *req)
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{
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if (!NFS_WBACK_BUSY(req)) {
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printk(KERN_ERR "NFS: Invalid unlock attempted\n");
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BUG();
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}
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smp_mb__before_atomic();
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clear_bit(PG_BUSY, &req->wb_flags);
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smp_mb__after_atomic();
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wake_up_bit(&req->wb_flags, PG_BUSY);
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}
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/**
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* nfs_unlock_and_release_request - Unlock request and release the nfs_page
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* @req:
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*/
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void nfs_unlock_and_release_request(struct nfs_page *req)
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{
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nfs_unlock_request(req);
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nfs_release_request(req);
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}
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/*
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* nfs_clear_request - Free up all resources allocated to the request
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* @req:
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*
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* Release page and open context resources associated with a read/write
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* request after it has completed.
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*/
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static void nfs_clear_request(struct nfs_page *req)
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{
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struct page *page = req->wb_page;
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struct nfs_open_context *ctx = req->wb_context;
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struct nfs_lock_context *l_ctx = req->wb_lock_context;
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if (page != NULL) {
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put_page(page);
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req->wb_page = NULL;
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}
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if (l_ctx != NULL) {
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if (atomic_dec_and_test(&l_ctx->io_count))
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wake_up_atomic_t(&l_ctx->io_count);
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nfs_put_lock_context(l_ctx);
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req->wb_lock_context = NULL;
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}
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if (ctx != NULL) {
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put_nfs_open_context(ctx);
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req->wb_context = NULL;
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}
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}
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/**
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* nfs_release_request - Release the count on an NFS read/write request
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* @req: request to release
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*
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* Note: Should never be called with the spinlock held!
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*/
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void nfs_free_request(struct nfs_page *req)
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{
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WARN_ON_ONCE(req->wb_this_page != req);
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/* extra debug: make sure no sync bits are still set */
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WARN_ON_ONCE(test_bit(PG_TEARDOWN, &req->wb_flags));
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WARN_ON_ONCE(test_bit(PG_UNLOCKPAGE, &req->wb_flags));
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WARN_ON_ONCE(test_bit(PG_UPTODATE, &req->wb_flags));
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WARN_ON_ONCE(test_bit(PG_WB_END, &req->wb_flags));
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WARN_ON_ONCE(test_bit(PG_REMOVE, &req->wb_flags));
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/* Release struct file and open context */
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nfs_clear_request(req);
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nfs_page_free(req);
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}
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void nfs_release_request(struct nfs_page *req)
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{
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kref_put(&req->wb_kref, nfs_page_group_destroy);
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}
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/**
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* nfs_wait_on_request - Wait for a request to complete.
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* @req: request to wait upon.
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*
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* Interruptible by fatal signals only.
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* The user is responsible for holding a count on the request.
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*/
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int
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nfs_wait_on_request(struct nfs_page *req)
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{
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return wait_on_bit_io(&req->wb_flags, PG_BUSY,
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TASK_UNINTERRUPTIBLE);
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}
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/*
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* nfs_generic_pg_test - determine if requests can be coalesced
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* @desc: pointer to descriptor
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* @prev: previous request in desc, or NULL
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* @req: this request
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*
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* Returns zero if @req can be coalesced into @desc, otherwise it returns
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* the size of the request.
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*/
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size_t nfs_generic_pg_test(struct nfs_pageio_descriptor *desc,
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struct nfs_page *prev, struct nfs_page *req)
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{
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struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc);
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if (mirror->pg_count > mirror->pg_bsize) {
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/* should never happen */
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WARN_ON_ONCE(1);
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return 0;
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}
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/*
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* Limit the request size so that we can still allocate a page array
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* for it without upsetting the slab allocator.
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*/
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if (((mirror->pg_count + req->wb_bytes) >> PAGE_SHIFT) *
|
|
sizeof(struct page *) > PAGE_SIZE)
|
|
return 0;
|
|
|
|
return min(mirror->pg_bsize - mirror->pg_count, (size_t)req->wb_bytes);
|
|
}
|
|
EXPORT_SYMBOL_GPL(nfs_generic_pg_test);
|
|
|
|
struct nfs_pgio_header *nfs_pgio_header_alloc(const struct nfs_rw_ops *ops)
|
|
{
|
|
struct nfs_pgio_header *hdr = ops->rw_alloc_header();
|
|
|
|
if (hdr) {
|
|
INIT_LIST_HEAD(&hdr->pages);
|
|
spin_lock_init(&hdr->lock);
|
|
hdr->rw_ops = ops;
|
|
}
|
|
return hdr;
|
|
}
|
|
EXPORT_SYMBOL_GPL(nfs_pgio_header_alloc);
|
|
|
|
/*
|
|
* nfs_pgio_header_free - Free a read or write header
|
|
* @hdr: The header to free
|
|
*/
|
|
void nfs_pgio_header_free(struct nfs_pgio_header *hdr)
|
|
{
|
|
hdr->rw_ops->rw_free_header(hdr);
|
|
}
|
|
EXPORT_SYMBOL_GPL(nfs_pgio_header_free);
|
|
|
|
/**
|
|
* nfs_pgio_data_destroy - make @hdr suitable for reuse
|
|
*
|
|
* Frees memory and releases refs from nfs_generic_pgio, so that it may
|
|
* be called again.
|
|
*
|
|
* @hdr: A header that has had nfs_generic_pgio called
|
|
*/
|
|
void nfs_pgio_data_destroy(struct nfs_pgio_header *hdr)
|
|
{
|
|
if (hdr->args.context)
|
|
put_nfs_open_context(hdr->args.context);
|
|
if (hdr->page_array.pagevec != hdr->page_array.page_array)
|
|
kfree(hdr->page_array.pagevec);
|
|
}
|
|
EXPORT_SYMBOL_GPL(nfs_pgio_data_destroy);
|
|
|
|
/**
|
|
* nfs_pgio_rpcsetup - Set up arguments for a pageio call
|
|
* @hdr: The pageio hdr
|
|
* @count: Number of bytes to read
|
|
* @offset: Initial offset
|
|
* @how: How to commit data (writes only)
|
|
* @cinfo: Commit information for the call (writes only)
|
|
*/
|
|
static void nfs_pgio_rpcsetup(struct nfs_pgio_header *hdr,
|
|
unsigned int count, unsigned int offset,
|
|
int how, struct nfs_commit_info *cinfo)
|
|
{
|
|
struct nfs_page *req = hdr->req;
|
|
|
|
/* Set up the RPC argument and reply structs
|
|
* NB: take care not to mess about with hdr->commit et al. */
|
|
|
|
hdr->args.fh = NFS_FH(hdr->inode);
|
|
hdr->args.offset = req_offset(req) + offset;
|
|
/* pnfs_set_layoutcommit needs this */
|
|
hdr->mds_offset = hdr->args.offset;
|
|
hdr->args.pgbase = req->wb_pgbase + offset;
|
|
hdr->args.pages = hdr->page_array.pagevec;
|
|
hdr->args.count = count;
|
|
hdr->args.context = get_nfs_open_context(req->wb_context);
|
|
hdr->args.lock_context = req->wb_lock_context;
|
|
hdr->args.stable = NFS_UNSTABLE;
|
|
switch (how & (FLUSH_STABLE | FLUSH_COND_STABLE)) {
|
|
case 0:
|
|
break;
|
|
case FLUSH_COND_STABLE:
|
|
if (nfs_reqs_to_commit(cinfo))
|
|
break;
|
|
default:
|
|
hdr->args.stable = NFS_FILE_SYNC;
|
|
}
|
|
|
|
hdr->res.fattr = &hdr->fattr;
|
|
hdr->res.count = count;
|
|
hdr->res.eof = 0;
|
|
hdr->res.verf = &hdr->verf;
|
|
nfs_fattr_init(&hdr->fattr);
|
|
}
|
|
|
|
/**
|
|
* nfs_pgio_prepare - Prepare pageio hdr to go over the wire
|
|
* @task: The current task
|
|
* @calldata: pageio header to prepare
|
|
*/
|
|
static void nfs_pgio_prepare(struct rpc_task *task, void *calldata)
|
|
{
|
|
struct nfs_pgio_header *hdr = calldata;
|
|
int err;
|
|
err = NFS_PROTO(hdr->inode)->pgio_rpc_prepare(task, hdr);
|
|
if (err)
|
|
rpc_exit(task, err);
|
|
}
|
|
|
|
int nfs_initiate_pgio(struct rpc_clnt *clnt, struct nfs_pgio_header *hdr,
|
|
struct rpc_cred *cred, const struct nfs_rpc_ops *rpc_ops,
|
|
const struct rpc_call_ops *call_ops, int how, int flags)
|
|
{
|
|
struct rpc_task *task;
|
|
struct rpc_message msg = {
|
|
.rpc_argp = &hdr->args,
|
|
.rpc_resp = &hdr->res,
|
|
.rpc_cred = cred,
|
|
};
|
|
struct rpc_task_setup task_setup_data = {
|
|
.rpc_client = clnt,
|
|
.task = &hdr->task,
|
|
.rpc_message = &msg,
|
|
.callback_ops = call_ops,
|
|
.callback_data = hdr,
|
|
.workqueue = nfsiod_workqueue,
|
|
.flags = RPC_TASK_ASYNC | flags,
|
|
};
|
|
int ret = 0;
|
|
|
|
hdr->rw_ops->rw_initiate(hdr, &msg, rpc_ops, &task_setup_data, how);
|
|
|
|
dprintk("NFS: initiated pgio call "
|
|
"(req %s/%llu, %u bytes @ offset %llu)\n",
|
|
hdr->inode->i_sb->s_id,
|
|
(unsigned long long)NFS_FILEID(hdr->inode),
|
|
hdr->args.count,
|
|
(unsigned long long)hdr->args.offset);
|
|
|
|
task = rpc_run_task(&task_setup_data);
|
|
if (IS_ERR(task)) {
|
|
ret = PTR_ERR(task);
|
|
goto out;
|
|
}
|
|
if (how & FLUSH_SYNC) {
|
|
ret = rpc_wait_for_completion_task(task);
|
|
if (ret == 0)
|
|
ret = task->tk_status;
|
|
}
|
|
rpc_put_task(task);
|
|
out:
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(nfs_initiate_pgio);
|
|
|
|
/**
|
|
* nfs_pgio_error - Clean up from a pageio error
|
|
* @desc: IO descriptor
|
|
* @hdr: pageio header
|
|
*/
|
|
static void nfs_pgio_error(struct nfs_pgio_header *hdr)
|
|
{
|
|
set_bit(NFS_IOHDR_REDO, &hdr->flags);
|
|
nfs_pgio_data_destroy(hdr);
|
|
hdr->completion_ops->completion(hdr);
|
|
}
|
|
|
|
/**
|
|
* nfs_pgio_release - Release pageio data
|
|
* @calldata: The pageio header to release
|
|
*/
|
|
static void nfs_pgio_release(void *calldata)
|
|
{
|
|
struct nfs_pgio_header *hdr = calldata;
|
|
nfs_pgio_data_destroy(hdr);
|
|
hdr->completion_ops->completion(hdr);
|
|
}
|
|
|
|
static void nfs_pageio_mirror_init(struct nfs_pgio_mirror *mirror,
|
|
unsigned int bsize)
|
|
{
|
|
INIT_LIST_HEAD(&mirror->pg_list);
|
|
mirror->pg_bytes_written = 0;
|
|
mirror->pg_count = 0;
|
|
mirror->pg_bsize = bsize;
|
|
mirror->pg_base = 0;
|
|
mirror->pg_recoalesce = 0;
|
|
}
|
|
|
|
/**
|
|
* nfs_pageio_init - initialise a page io descriptor
|
|
* @desc: pointer to descriptor
|
|
* @inode: pointer to inode
|
|
* @pg_ops: pointer to pageio operations
|
|
* @compl_ops: pointer to pageio completion operations
|
|
* @rw_ops: pointer to nfs read/write operations
|
|
* @bsize: io block size
|
|
* @io_flags: extra parameters for the io function
|
|
*/
|
|
void nfs_pageio_init(struct nfs_pageio_descriptor *desc,
|
|
struct inode *inode,
|
|
const struct nfs_pageio_ops *pg_ops,
|
|
const struct nfs_pgio_completion_ops *compl_ops,
|
|
const struct nfs_rw_ops *rw_ops,
|
|
size_t bsize,
|
|
int io_flags)
|
|
{
|
|
struct nfs_pgio_mirror *new;
|
|
int i;
|
|
|
|
desc->pg_moreio = 0;
|
|
desc->pg_inode = inode;
|
|
desc->pg_ops = pg_ops;
|
|
desc->pg_completion_ops = compl_ops;
|
|
desc->pg_rw_ops = rw_ops;
|
|
desc->pg_ioflags = io_flags;
|
|
desc->pg_error = 0;
|
|
desc->pg_lseg = NULL;
|
|
desc->pg_dreq = NULL;
|
|
desc->pg_layout_private = NULL;
|
|
desc->pg_bsize = bsize;
|
|
|
|
desc->pg_mirror_count = 1;
|
|
desc->pg_mirror_idx = 0;
|
|
|
|
if (pg_ops->pg_get_mirror_count) {
|
|
/* until we have a request, we don't have an lseg and no
|
|
* idea how many mirrors there will be */
|
|
new = kcalloc(NFS_PAGEIO_DESCRIPTOR_MIRROR_MAX,
|
|
sizeof(struct nfs_pgio_mirror), GFP_KERNEL);
|
|
desc->pg_mirrors_dynamic = new;
|
|
desc->pg_mirrors = new;
|
|
|
|
for (i = 0; i < NFS_PAGEIO_DESCRIPTOR_MIRROR_MAX; i++)
|
|
nfs_pageio_mirror_init(&desc->pg_mirrors[i], bsize);
|
|
} else {
|
|
desc->pg_mirrors_dynamic = NULL;
|
|
desc->pg_mirrors = desc->pg_mirrors_static;
|
|
nfs_pageio_mirror_init(&desc->pg_mirrors[0], bsize);
|
|
}
|
|
}
|
|
EXPORT_SYMBOL_GPL(nfs_pageio_init);
|
|
|
|
/**
|
|
* nfs_pgio_result - Basic pageio error handling
|
|
* @task: The task that ran
|
|
* @calldata: Pageio header to check
|
|
*/
|
|
static void nfs_pgio_result(struct rpc_task *task, void *calldata)
|
|
{
|
|
struct nfs_pgio_header *hdr = calldata;
|
|
struct inode *inode = hdr->inode;
|
|
|
|
dprintk("NFS: %s: %5u, (status %d)\n", __func__,
|
|
task->tk_pid, task->tk_status);
|
|
|
|
if (hdr->rw_ops->rw_done(task, hdr, inode) != 0)
|
|
return;
|
|
if (task->tk_status < 0)
|
|
nfs_set_pgio_error(hdr, task->tk_status, hdr->args.offset);
|
|
else
|
|
hdr->rw_ops->rw_result(task, hdr);
|
|
}
|
|
|
|
/*
|
|
* Create an RPC task for the given read or write request and kick it.
|
|
* The page must have been locked by the caller.
|
|
*
|
|
* It may happen that the page we're passed is not marked dirty.
|
|
* This is the case if nfs_updatepage detects a conflicting request
|
|
* that has been written but not committed.
|
|
*/
|
|
int nfs_generic_pgio(struct nfs_pageio_descriptor *desc,
|
|
struct nfs_pgio_header *hdr)
|
|
{
|
|
struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc);
|
|
|
|
struct nfs_page *req;
|
|
struct page **pages,
|
|
*last_page;
|
|
struct list_head *head = &mirror->pg_list;
|
|
struct nfs_commit_info cinfo;
|
|
unsigned int pagecount, pageused;
|
|
|
|
pagecount = nfs_page_array_len(mirror->pg_base, mirror->pg_count);
|
|
if (!nfs_pgarray_set(&hdr->page_array, pagecount)) {
|
|
nfs_pgio_error(hdr);
|
|
desc->pg_error = -ENOMEM;
|
|
return desc->pg_error;
|
|
}
|
|
|
|
nfs_init_cinfo(&cinfo, desc->pg_inode, desc->pg_dreq);
|
|
pages = hdr->page_array.pagevec;
|
|
last_page = NULL;
|
|
pageused = 0;
|
|
while (!list_empty(head)) {
|
|
req = nfs_list_entry(head->next);
|
|
nfs_list_remove_request(req);
|
|
nfs_list_add_request(req, &hdr->pages);
|
|
|
|
if (!last_page || last_page != req->wb_page) {
|
|
pageused++;
|
|
if (pageused > pagecount)
|
|
break;
|
|
*pages++ = last_page = req->wb_page;
|
|
}
|
|
}
|
|
if (WARN_ON_ONCE(pageused != pagecount)) {
|
|
nfs_pgio_error(hdr);
|
|
desc->pg_error = -EINVAL;
|
|
return desc->pg_error;
|
|
}
|
|
|
|
if ((desc->pg_ioflags & FLUSH_COND_STABLE) &&
|
|
(desc->pg_moreio || nfs_reqs_to_commit(&cinfo)))
|
|
desc->pg_ioflags &= ~FLUSH_COND_STABLE;
|
|
|
|
/* Set up the argument struct */
|
|
nfs_pgio_rpcsetup(hdr, mirror->pg_count, 0, desc->pg_ioflags, &cinfo);
|
|
desc->pg_rpc_callops = &nfs_pgio_common_ops;
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(nfs_generic_pgio);
|
|
|
|
static int nfs_generic_pg_pgios(struct nfs_pageio_descriptor *desc)
|
|
{
|
|
struct nfs_pgio_header *hdr;
|
|
int ret;
|
|
|
|
hdr = nfs_pgio_header_alloc(desc->pg_rw_ops);
|
|
if (!hdr) {
|
|
desc->pg_error = -ENOMEM;
|
|
return desc->pg_error;
|
|
}
|
|
nfs_pgheader_init(desc, hdr, nfs_pgio_header_free);
|
|
ret = nfs_generic_pgio(desc, hdr);
|
|
if (ret == 0)
|
|
ret = nfs_initiate_pgio(NFS_CLIENT(hdr->inode),
|
|
hdr,
|
|
hdr->cred,
|
|
NFS_PROTO(hdr->inode),
|
|
desc->pg_rpc_callops,
|
|
desc->pg_ioflags, 0);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* nfs_pageio_setup_mirroring - determine if mirroring is to be used
|
|
* by calling the pg_get_mirror_count op
|
|
*/
|
|
static int nfs_pageio_setup_mirroring(struct nfs_pageio_descriptor *pgio,
|
|
struct nfs_page *req)
|
|
{
|
|
int mirror_count = 1;
|
|
|
|
if (!pgio->pg_ops->pg_get_mirror_count)
|
|
return 0;
|
|
|
|
mirror_count = pgio->pg_ops->pg_get_mirror_count(pgio, req);
|
|
|
|
if (pgio->pg_error < 0)
|
|
return pgio->pg_error;
|
|
|
|
if (!mirror_count || mirror_count > NFS_PAGEIO_DESCRIPTOR_MIRROR_MAX)
|
|
return -EINVAL;
|
|
|
|
if (WARN_ON_ONCE(!pgio->pg_mirrors_dynamic))
|
|
return -EINVAL;
|
|
|
|
pgio->pg_mirror_count = mirror_count;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* nfs_pageio_stop_mirroring - stop using mirroring (set mirror count to 1)
|
|
*/
|
|
void nfs_pageio_stop_mirroring(struct nfs_pageio_descriptor *pgio)
|
|
{
|
|
pgio->pg_mirror_count = 1;
|
|
pgio->pg_mirror_idx = 0;
|
|
}
|
|
|
|
static void nfs_pageio_cleanup_mirroring(struct nfs_pageio_descriptor *pgio)
|
|
{
|
|
pgio->pg_mirror_count = 1;
|
|
pgio->pg_mirror_idx = 0;
|
|
pgio->pg_mirrors = pgio->pg_mirrors_static;
|
|
kfree(pgio->pg_mirrors_dynamic);
|
|
pgio->pg_mirrors_dynamic = NULL;
|
|
}
|
|
|
|
static bool nfs_match_lock_context(const struct nfs_lock_context *l1,
|
|
const struct nfs_lock_context *l2)
|
|
{
|
|
return l1->lockowner.l_owner == l2->lockowner.l_owner
|
|
&& l1->lockowner.l_pid == l2->lockowner.l_pid;
|
|
}
|
|
|
|
/**
|
|
* nfs_can_coalesce_requests - test two requests for compatibility
|
|
* @prev: pointer to nfs_page
|
|
* @req: pointer to nfs_page
|
|
*
|
|
* The nfs_page structures 'prev' and 'req' are compared to ensure that the
|
|
* page data area they describe is contiguous, and that their RPC
|
|
* credentials, NFSv4 open state, and lockowners are the same.
|
|
*
|
|
* Return 'true' if this is the case, else return 'false'.
|
|
*/
|
|
static bool nfs_can_coalesce_requests(struct nfs_page *prev,
|
|
struct nfs_page *req,
|
|
struct nfs_pageio_descriptor *pgio)
|
|
{
|
|
size_t size;
|
|
struct file_lock_context *flctx;
|
|
|
|
if (prev) {
|
|
if (!nfs_match_open_context(req->wb_context, prev->wb_context))
|
|
return false;
|
|
flctx = d_inode(req->wb_context->dentry)->i_flctx;
|
|
if (flctx != NULL &&
|
|
!(list_empty_careful(&flctx->flc_posix) &&
|
|
list_empty_careful(&flctx->flc_flock)) &&
|
|
!nfs_match_lock_context(req->wb_lock_context,
|
|
prev->wb_lock_context))
|
|
return false;
|
|
if (req_offset(req) != req_offset(prev) + prev->wb_bytes)
|
|
return false;
|
|
if (req->wb_page == prev->wb_page) {
|
|
if (req->wb_pgbase != prev->wb_pgbase + prev->wb_bytes)
|
|
return false;
|
|
} else {
|
|
if (req->wb_pgbase != 0 ||
|
|
prev->wb_pgbase + prev->wb_bytes != PAGE_SIZE)
|
|
return false;
|
|
}
|
|
}
|
|
size = pgio->pg_ops->pg_test(pgio, prev, req);
|
|
WARN_ON_ONCE(size > req->wb_bytes);
|
|
if (size && size < req->wb_bytes)
|
|
req->wb_bytes = size;
|
|
return size > 0;
|
|
}
|
|
|
|
/**
|
|
* nfs_pageio_do_add_request - Attempt to coalesce a request into a page list.
|
|
* @desc: destination io descriptor
|
|
* @req: request
|
|
*
|
|
* Returns true if the request 'req' was successfully coalesced into the
|
|
* existing list of pages 'desc'.
|
|
*/
|
|
static int nfs_pageio_do_add_request(struct nfs_pageio_descriptor *desc,
|
|
struct nfs_page *req)
|
|
{
|
|
struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc);
|
|
|
|
struct nfs_page *prev = NULL;
|
|
|
|
if (mirror->pg_count != 0) {
|
|
prev = nfs_list_entry(mirror->pg_list.prev);
|
|
} else {
|
|
if (desc->pg_ops->pg_init)
|
|
desc->pg_ops->pg_init(desc, req);
|
|
if (desc->pg_error < 0)
|
|
return 0;
|
|
mirror->pg_base = req->wb_pgbase;
|
|
}
|
|
if (!nfs_can_coalesce_requests(prev, req, desc))
|
|
return 0;
|
|
nfs_list_remove_request(req);
|
|
nfs_list_add_request(req, &mirror->pg_list);
|
|
mirror->pg_count += req->wb_bytes;
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* Helper for nfs_pageio_add_request and nfs_pageio_complete
|
|
*/
|
|
static void nfs_pageio_doio(struct nfs_pageio_descriptor *desc)
|
|
{
|
|
struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc);
|
|
|
|
|
|
if (!list_empty(&mirror->pg_list)) {
|
|
int error = desc->pg_ops->pg_doio(desc);
|
|
if (error < 0)
|
|
desc->pg_error = error;
|
|
else
|
|
mirror->pg_bytes_written += mirror->pg_count;
|
|
}
|
|
if (list_empty(&mirror->pg_list)) {
|
|
mirror->pg_count = 0;
|
|
mirror->pg_base = 0;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* nfs_pageio_add_request - Attempt to coalesce a request into a page list.
|
|
* @desc: destination io descriptor
|
|
* @req: request
|
|
*
|
|
* This may split a request into subrequests which are all part of the
|
|
* same page group.
|
|
*
|
|
* Returns true if the request 'req' was successfully coalesced into the
|
|
* existing list of pages 'desc'.
|
|
*/
|
|
static int __nfs_pageio_add_request(struct nfs_pageio_descriptor *desc,
|
|
struct nfs_page *req)
|
|
{
|
|
struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc);
|
|
|
|
struct nfs_page *subreq;
|
|
unsigned int bytes_left = 0;
|
|
unsigned int offset, pgbase;
|
|
|
|
nfs_page_group_lock(req, false);
|
|
|
|
subreq = req;
|
|
bytes_left = subreq->wb_bytes;
|
|
offset = subreq->wb_offset;
|
|
pgbase = subreq->wb_pgbase;
|
|
|
|
do {
|
|
if (!nfs_pageio_do_add_request(desc, subreq)) {
|
|
/* make sure pg_test call(s) did nothing */
|
|
WARN_ON_ONCE(subreq->wb_bytes != bytes_left);
|
|
WARN_ON_ONCE(subreq->wb_offset != offset);
|
|
WARN_ON_ONCE(subreq->wb_pgbase != pgbase);
|
|
|
|
nfs_page_group_unlock(req);
|
|
desc->pg_moreio = 1;
|
|
nfs_pageio_doio(desc);
|
|
if (desc->pg_error < 0)
|
|
return 0;
|
|
if (mirror->pg_recoalesce)
|
|
return 0;
|
|
/* retry add_request for this subreq */
|
|
nfs_page_group_lock(req, false);
|
|
continue;
|
|
}
|
|
|
|
/* check for buggy pg_test call(s) */
|
|
WARN_ON_ONCE(subreq->wb_bytes + subreq->wb_pgbase > PAGE_SIZE);
|
|
WARN_ON_ONCE(subreq->wb_bytes > bytes_left);
|
|
WARN_ON_ONCE(subreq->wb_bytes == 0);
|
|
|
|
bytes_left -= subreq->wb_bytes;
|
|
offset += subreq->wb_bytes;
|
|
pgbase += subreq->wb_bytes;
|
|
|
|
if (bytes_left) {
|
|
subreq = nfs_create_request(req->wb_context,
|
|
req->wb_page,
|
|
subreq, pgbase, bytes_left);
|
|
if (IS_ERR(subreq))
|
|
goto err_ptr;
|
|
nfs_lock_request(subreq);
|
|
subreq->wb_offset = offset;
|
|
subreq->wb_index = req->wb_index;
|
|
}
|
|
} while (bytes_left > 0);
|
|
|
|
nfs_page_group_unlock(req);
|
|
return 1;
|
|
err_ptr:
|
|
desc->pg_error = PTR_ERR(subreq);
|
|
nfs_page_group_unlock(req);
|
|
return 0;
|
|
}
|
|
|
|
static int nfs_do_recoalesce(struct nfs_pageio_descriptor *desc)
|
|
{
|
|
struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc);
|
|
LIST_HEAD(head);
|
|
|
|
do {
|
|
list_splice_init(&mirror->pg_list, &head);
|
|
mirror->pg_bytes_written -= mirror->pg_count;
|
|
mirror->pg_count = 0;
|
|
mirror->pg_base = 0;
|
|
mirror->pg_recoalesce = 0;
|
|
|
|
while (!list_empty(&head)) {
|
|
struct nfs_page *req;
|
|
|
|
req = list_first_entry(&head, struct nfs_page, wb_list);
|
|
nfs_list_remove_request(req);
|
|
if (__nfs_pageio_add_request(desc, req))
|
|
continue;
|
|
if (desc->pg_error < 0) {
|
|
list_splice_tail(&head, &mirror->pg_list);
|
|
mirror->pg_recoalesce = 1;
|
|
return 0;
|
|
}
|
|
break;
|
|
}
|
|
} while (mirror->pg_recoalesce);
|
|
return 1;
|
|
}
|
|
|
|
static int nfs_pageio_add_request_mirror(struct nfs_pageio_descriptor *desc,
|
|
struct nfs_page *req)
|
|
{
|
|
int ret;
|
|
|
|
do {
|
|
ret = __nfs_pageio_add_request(desc, req);
|
|
if (ret)
|
|
break;
|
|
if (desc->pg_error < 0)
|
|
break;
|
|
ret = nfs_do_recoalesce(desc);
|
|
} while (ret);
|
|
|
|
return ret;
|
|
}
|
|
|
|
int nfs_pageio_add_request(struct nfs_pageio_descriptor *desc,
|
|
struct nfs_page *req)
|
|
{
|
|
u32 midx;
|
|
unsigned int pgbase, offset, bytes;
|
|
struct nfs_page *dupreq, *lastreq;
|
|
|
|
pgbase = req->wb_pgbase;
|
|
offset = req->wb_offset;
|
|
bytes = req->wb_bytes;
|
|
|
|
nfs_pageio_setup_mirroring(desc, req);
|
|
if (desc->pg_error < 0)
|
|
goto out_failed;
|
|
|
|
for (midx = 0; midx < desc->pg_mirror_count; midx++) {
|
|
if (midx) {
|
|
nfs_page_group_lock(req, false);
|
|
|
|
/* find the last request */
|
|
for (lastreq = req->wb_head;
|
|
lastreq->wb_this_page != req->wb_head;
|
|
lastreq = lastreq->wb_this_page)
|
|
;
|
|
|
|
dupreq = nfs_create_request(req->wb_context,
|
|
req->wb_page, lastreq, pgbase, bytes);
|
|
|
|
if (IS_ERR(dupreq)) {
|
|
nfs_page_group_unlock(req);
|
|
desc->pg_error = PTR_ERR(dupreq);
|
|
goto out_failed;
|
|
}
|
|
|
|
nfs_lock_request(dupreq);
|
|
nfs_page_group_unlock(req);
|
|
dupreq->wb_offset = offset;
|
|
dupreq->wb_index = req->wb_index;
|
|
} else
|
|
dupreq = req;
|
|
|
|
if (nfs_pgio_has_mirroring(desc))
|
|
desc->pg_mirror_idx = midx;
|
|
if (!nfs_pageio_add_request_mirror(desc, dupreq))
|
|
goto out_failed;
|
|
}
|
|
|
|
return 1;
|
|
|
|
out_failed:
|
|
/*
|
|
* We might have failed before sending any reqs over wire.
|
|
* Clean up rest of the reqs in mirror pg_list.
|
|
*/
|
|
if (desc->pg_error) {
|
|
struct nfs_pgio_mirror *mirror;
|
|
void (*func)(struct list_head *);
|
|
|
|
/* remember fatal errors */
|
|
if (nfs_error_is_fatal(desc->pg_error))
|
|
mapping_set_error(desc->pg_inode->i_mapping,
|
|
desc->pg_error);
|
|
|
|
func = desc->pg_completion_ops->error_cleanup;
|
|
for (midx = 0; midx < desc->pg_mirror_count; midx++) {
|
|
mirror = &desc->pg_mirrors[midx];
|
|
func(&mirror->pg_list);
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* nfs_pageio_complete_mirror - Complete I/O on the current mirror of an
|
|
* nfs_pageio_descriptor
|
|
* @desc: pointer to io descriptor
|
|
* @mirror_idx: pointer to mirror index
|
|
*/
|
|
static void nfs_pageio_complete_mirror(struct nfs_pageio_descriptor *desc,
|
|
u32 mirror_idx)
|
|
{
|
|
struct nfs_pgio_mirror *mirror = &desc->pg_mirrors[mirror_idx];
|
|
u32 restore_idx = desc->pg_mirror_idx;
|
|
|
|
if (nfs_pgio_has_mirroring(desc))
|
|
desc->pg_mirror_idx = mirror_idx;
|
|
for (;;) {
|
|
nfs_pageio_doio(desc);
|
|
if (!mirror->pg_recoalesce)
|
|
break;
|
|
if (!nfs_do_recoalesce(desc))
|
|
break;
|
|
}
|
|
desc->pg_mirror_idx = restore_idx;
|
|
}
|
|
|
|
/*
|
|
* nfs_pageio_resend - Transfer requests to new descriptor and resend
|
|
* @hdr - the pgio header to move request from
|
|
* @desc - the pageio descriptor to add requests to
|
|
*
|
|
* Try to move each request (nfs_page) from @hdr to @desc then attempt
|
|
* to send them.
|
|
*
|
|
* Returns 0 on success and < 0 on error.
|
|
*/
|
|
int nfs_pageio_resend(struct nfs_pageio_descriptor *desc,
|
|
struct nfs_pgio_header *hdr)
|
|
{
|
|
LIST_HEAD(failed);
|
|
|
|
desc->pg_dreq = hdr->dreq;
|
|
while (!list_empty(&hdr->pages)) {
|
|
struct nfs_page *req = nfs_list_entry(hdr->pages.next);
|
|
|
|
nfs_list_remove_request(req);
|
|
if (!nfs_pageio_add_request(desc, req))
|
|
nfs_list_add_request(req, &failed);
|
|
}
|
|
nfs_pageio_complete(desc);
|
|
if (!list_empty(&failed)) {
|
|
list_move(&failed, &hdr->pages);
|
|
return desc->pg_error < 0 ? desc->pg_error : -EIO;
|
|
}
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(nfs_pageio_resend);
|
|
|
|
/**
|
|
* nfs_pageio_complete - Complete I/O then cleanup an nfs_pageio_descriptor
|
|
* @desc: pointer to io descriptor
|
|
*/
|
|
void nfs_pageio_complete(struct nfs_pageio_descriptor *desc)
|
|
{
|
|
u32 midx;
|
|
|
|
for (midx = 0; midx < desc->pg_mirror_count; midx++)
|
|
nfs_pageio_complete_mirror(desc, midx);
|
|
|
|
if (desc->pg_ops->pg_cleanup)
|
|
desc->pg_ops->pg_cleanup(desc);
|
|
nfs_pageio_cleanup_mirroring(desc);
|
|
}
|
|
|
|
/**
|
|
* nfs_pageio_cond_complete - Conditional I/O completion
|
|
* @desc: pointer to io descriptor
|
|
* @index: page index
|
|
*
|
|
* It is important to ensure that processes don't try to take locks
|
|
* on non-contiguous ranges of pages as that might deadlock. This
|
|
* function should be called before attempting to wait on a locked
|
|
* nfs_page. It will complete the I/O if the page index 'index'
|
|
* is not contiguous with the existing list of pages in 'desc'.
|
|
*/
|
|
void nfs_pageio_cond_complete(struct nfs_pageio_descriptor *desc, pgoff_t index)
|
|
{
|
|
struct nfs_pgio_mirror *mirror;
|
|
struct nfs_page *prev;
|
|
u32 midx;
|
|
|
|
for (midx = 0; midx < desc->pg_mirror_count; midx++) {
|
|
mirror = &desc->pg_mirrors[midx];
|
|
if (!list_empty(&mirror->pg_list)) {
|
|
prev = nfs_list_entry(mirror->pg_list.prev);
|
|
if (index != prev->wb_index + 1)
|
|
nfs_pageio_complete_mirror(desc, midx);
|
|
}
|
|
}
|
|
}
|
|
|
|
int __init nfs_init_nfspagecache(void)
|
|
{
|
|
nfs_page_cachep = kmem_cache_create("nfs_page",
|
|
sizeof(struct nfs_page),
|
|
0, SLAB_HWCACHE_ALIGN,
|
|
NULL);
|
|
if (nfs_page_cachep == NULL)
|
|
return -ENOMEM;
|
|
|
|
return 0;
|
|
}
|
|
|
|
void nfs_destroy_nfspagecache(void)
|
|
{
|
|
kmem_cache_destroy(nfs_page_cachep);
|
|
}
|
|
|
|
static const struct rpc_call_ops nfs_pgio_common_ops = {
|
|
.rpc_call_prepare = nfs_pgio_prepare,
|
|
.rpc_call_done = nfs_pgio_result,
|
|
.rpc_release = nfs_pgio_release,
|
|
};
|
|
|
|
const struct nfs_pageio_ops nfs_pgio_rw_ops = {
|
|
.pg_test = nfs_generic_pg_test,
|
|
.pg_doio = nfs_generic_pg_pgios,
|
|
};
|