mirror of https://gitee.com/openkylin/linux.git
3089 lines
84 KiB
C
3089 lines
84 KiB
C
#include <linux/ceph/ceph_debug.h>
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#include <linux/fs.h>
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <linux/slab.h>
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#include <linux/vmalloc.h>
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#include <linux/wait.h>
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#include <linux/writeback.h>
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#include "super.h"
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#include "mds_client.h"
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#include <linux/ceph/decode.h>
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#include <linux/ceph/messenger.h>
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/*
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* Capability management
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*
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* The Ceph metadata servers control client access to inode metadata
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* and file data by issuing capabilities, granting clients permission
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* to read and/or write both inode field and file data to OSDs
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* (storage nodes). Each capability consists of a set of bits
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* indicating which operations are allowed.
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*
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* If the client holds a *_SHARED cap, the client has a coherent value
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* that can be safely read from the cached inode.
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*
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* In the case of a *_EXCL (exclusive) or FILE_WR capabilities, the
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* client is allowed to change inode attributes (e.g., file size,
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* mtime), note its dirty state in the ceph_cap, and asynchronously
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* flush that metadata change to the MDS.
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*
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* In the event of a conflicting operation (perhaps by another
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* client), the MDS will revoke the conflicting client capabilities.
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*
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* In order for a client to cache an inode, it must hold a capability
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* with at least one MDS server. When inodes are released, release
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* notifications are batched and periodically sent en masse to the MDS
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* cluster to release server state.
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*/
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/*
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* Generate readable cap strings for debugging output.
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*/
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#define MAX_CAP_STR 20
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static char cap_str[MAX_CAP_STR][40];
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static DEFINE_SPINLOCK(cap_str_lock);
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static int last_cap_str;
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static char *gcap_string(char *s, int c)
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{
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if (c & CEPH_CAP_GSHARED)
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*s++ = 's';
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if (c & CEPH_CAP_GEXCL)
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*s++ = 'x';
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if (c & CEPH_CAP_GCACHE)
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*s++ = 'c';
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if (c & CEPH_CAP_GRD)
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*s++ = 'r';
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if (c & CEPH_CAP_GWR)
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*s++ = 'w';
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if (c & CEPH_CAP_GBUFFER)
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*s++ = 'b';
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if (c & CEPH_CAP_GLAZYIO)
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*s++ = 'l';
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return s;
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}
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const char *ceph_cap_string(int caps)
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{
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int i;
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char *s;
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int c;
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spin_lock(&cap_str_lock);
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i = last_cap_str++;
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if (last_cap_str == MAX_CAP_STR)
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last_cap_str = 0;
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spin_unlock(&cap_str_lock);
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s = cap_str[i];
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if (caps & CEPH_CAP_PIN)
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*s++ = 'p';
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c = (caps >> CEPH_CAP_SAUTH) & 3;
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if (c) {
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*s++ = 'A';
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s = gcap_string(s, c);
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}
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c = (caps >> CEPH_CAP_SLINK) & 3;
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if (c) {
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*s++ = 'L';
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s = gcap_string(s, c);
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}
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c = (caps >> CEPH_CAP_SXATTR) & 3;
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if (c) {
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*s++ = 'X';
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s = gcap_string(s, c);
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}
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c = caps >> CEPH_CAP_SFILE;
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if (c) {
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*s++ = 'F';
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s = gcap_string(s, c);
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}
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if (s == cap_str[i])
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*s++ = '-';
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*s = 0;
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return cap_str[i];
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}
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void ceph_caps_init(struct ceph_mds_client *mdsc)
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{
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INIT_LIST_HEAD(&mdsc->caps_list);
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spin_lock_init(&mdsc->caps_list_lock);
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}
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void ceph_caps_finalize(struct ceph_mds_client *mdsc)
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{
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struct ceph_cap *cap;
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spin_lock(&mdsc->caps_list_lock);
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while (!list_empty(&mdsc->caps_list)) {
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cap = list_first_entry(&mdsc->caps_list,
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struct ceph_cap, caps_item);
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list_del(&cap->caps_item);
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kmem_cache_free(ceph_cap_cachep, cap);
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}
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mdsc->caps_total_count = 0;
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mdsc->caps_avail_count = 0;
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mdsc->caps_use_count = 0;
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mdsc->caps_reserve_count = 0;
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mdsc->caps_min_count = 0;
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spin_unlock(&mdsc->caps_list_lock);
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}
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void ceph_adjust_min_caps(struct ceph_mds_client *mdsc, int delta)
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{
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spin_lock(&mdsc->caps_list_lock);
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mdsc->caps_min_count += delta;
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BUG_ON(mdsc->caps_min_count < 0);
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spin_unlock(&mdsc->caps_list_lock);
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}
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int ceph_reserve_caps(struct ceph_mds_client *mdsc,
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struct ceph_cap_reservation *ctx, int need)
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{
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int i;
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struct ceph_cap *cap;
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int have;
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int alloc = 0;
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LIST_HEAD(newcaps);
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int ret = 0;
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dout("reserve caps ctx=%p need=%d\n", ctx, need);
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/* first reserve any caps that are already allocated */
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spin_lock(&mdsc->caps_list_lock);
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if (mdsc->caps_avail_count >= need)
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have = need;
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else
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have = mdsc->caps_avail_count;
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mdsc->caps_avail_count -= have;
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mdsc->caps_reserve_count += have;
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BUG_ON(mdsc->caps_total_count != mdsc->caps_use_count +
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mdsc->caps_reserve_count +
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mdsc->caps_avail_count);
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spin_unlock(&mdsc->caps_list_lock);
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for (i = have; i < need; i++) {
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cap = kmem_cache_alloc(ceph_cap_cachep, GFP_NOFS);
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if (!cap) {
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ret = -ENOMEM;
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goto out_alloc_count;
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}
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list_add(&cap->caps_item, &newcaps);
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alloc++;
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}
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BUG_ON(have + alloc != need);
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spin_lock(&mdsc->caps_list_lock);
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mdsc->caps_total_count += alloc;
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mdsc->caps_reserve_count += alloc;
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list_splice(&newcaps, &mdsc->caps_list);
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BUG_ON(mdsc->caps_total_count != mdsc->caps_use_count +
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mdsc->caps_reserve_count +
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mdsc->caps_avail_count);
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spin_unlock(&mdsc->caps_list_lock);
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ctx->count = need;
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dout("reserve caps ctx=%p %d = %d used + %d resv + %d avail\n",
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ctx, mdsc->caps_total_count, mdsc->caps_use_count,
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mdsc->caps_reserve_count, mdsc->caps_avail_count);
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return 0;
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out_alloc_count:
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/* we didn't manage to reserve as much as we needed */
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pr_warning("reserve caps ctx=%p ENOMEM need=%d got=%d\n",
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ctx, need, have);
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return ret;
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}
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int ceph_unreserve_caps(struct ceph_mds_client *mdsc,
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struct ceph_cap_reservation *ctx)
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{
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dout("unreserve caps ctx=%p count=%d\n", ctx, ctx->count);
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if (ctx->count) {
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spin_lock(&mdsc->caps_list_lock);
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BUG_ON(mdsc->caps_reserve_count < ctx->count);
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mdsc->caps_reserve_count -= ctx->count;
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mdsc->caps_avail_count += ctx->count;
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ctx->count = 0;
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dout("unreserve caps %d = %d used + %d resv + %d avail\n",
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mdsc->caps_total_count, mdsc->caps_use_count,
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mdsc->caps_reserve_count, mdsc->caps_avail_count);
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BUG_ON(mdsc->caps_total_count != mdsc->caps_use_count +
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mdsc->caps_reserve_count +
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mdsc->caps_avail_count);
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spin_unlock(&mdsc->caps_list_lock);
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}
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return 0;
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}
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static struct ceph_cap *get_cap(struct ceph_mds_client *mdsc,
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struct ceph_cap_reservation *ctx)
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{
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struct ceph_cap *cap = NULL;
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/* temporary, until we do something about cap import/export */
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if (!ctx) {
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cap = kmem_cache_alloc(ceph_cap_cachep, GFP_NOFS);
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if (cap) {
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mdsc->caps_use_count++;
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mdsc->caps_total_count++;
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}
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return cap;
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}
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spin_lock(&mdsc->caps_list_lock);
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dout("get_cap ctx=%p (%d) %d = %d used + %d resv + %d avail\n",
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ctx, ctx->count, mdsc->caps_total_count, mdsc->caps_use_count,
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mdsc->caps_reserve_count, mdsc->caps_avail_count);
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BUG_ON(!ctx->count);
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BUG_ON(ctx->count > mdsc->caps_reserve_count);
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BUG_ON(list_empty(&mdsc->caps_list));
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ctx->count--;
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mdsc->caps_reserve_count--;
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mdsc->caps_use_count++;
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cap = list_first_entry(&mdsc->caps_list, struct ceph_cap, caps_item);
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list_del(&cap->caps_item);
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BUG_ON(mdsc->caps_total_count != mdsc->caps_use_count +
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mdsc->caps_reserve_count + mdsc->caps_avail_count);
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spin_unlock(&mdsc->caps_list_lock);
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return cap;
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}
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void ceph_put_cap(struct ceph_mds_client *mdsc, struct ceph_cap *cap)
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{
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spin_lock(&mdsc->caps_list_lock);
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dout("put_cap %p %d = %d used + %d resv + %d avail\n",
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cap, mdsc->caps_total_count, mdsc->caps_use_count,
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mdsc->caps_reserve_count, mdsc->caps_avail_count);
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mdsc->caps_use_count--;
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/*
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* Keep some preallocated caps around (ceph_min_count), to
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* avoid lots of free/alloc churn.
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*/
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if (mdsc->caps_avail_count >= mdsc->caps_reserve_count +
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mdsc->caps_min_count) {
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mdsc->caps_total_count--;
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kmem_cache_free(ceph_cap_cachep, cap);
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} else {
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mdsc->caps_avail_count++;
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list_add(&cap->caps_item, &mdsc->caps_list);
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}
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BUG_ON(mdsc->caps_total_count != mdsc->caps_use_count +
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mdsc->caps_reserve_count + mdsc->caps_avail_count);
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spin_unlock(&mdsc->caps_list_lock);
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}
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void ceph_reservation_status(struct ceph_fs_client *fsc,
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int *total, int *avail, int *used, int *reserved,
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int *min)
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{
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struct ceph_mds_client *mdsc = fsc->mdsc;
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if (total)
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*total = mdsc->caps_total_count;
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if (avail)
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*avail = mdsc->caps_avail_count;
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if (used)
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*used = mdsc->caps_use_count;
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if (reserved)
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*reserved = mdsc->caps_reserve_count;
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if (min)
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*min = mdsc->caps_min_count;
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}
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/*
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* Find ceph_cap for given mds, if any.
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*
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* Called with i_lock held.
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*/
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static struct ceph_cap *__get_cap_for_mds(struct ceph_inode_info *ci, int mds)
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{
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struct ceph_cap *cap;
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struct rb_node *n = ci->i_caps.rb_node;
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while (n) {
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cap = rb_entry(n, struct ceph_cap, ci_node);
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if (mds < cap->mds)
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n = n->rb_left;
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else if (mds > cap->mds)
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n = n->rb_right;
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else
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return cap;
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}
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return NULL;
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}
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struct ceph_cap *ceph_get_cap_for_mds(struct ceph_inode_info *ci, int mds)
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{
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struct ceph_cap *cap;
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spin_lock(&ci->vfs_inode.i_lock);
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cap = __get_cap_for_mds(ci, mds);
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spin_unlock(&ci->vfs_inode.i_lock);
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return cap;
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}
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/*
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* Return id of any MDS with a cap, preferably FILE_WR|BUFFER|EXCL, else -1.
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*/
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static int __ceph_get_cap_mds(struct ceph_inode_info *ci)
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{
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struct ceph_cap *cap;
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int mds = -1;
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struct rb_node *p;
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/* prefer mds with WR|BUFFER|EXCL caps */
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for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
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cap = rb_entry(p, struct ceph_cap, ci_node);
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mds = cap->mds;
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if (cap->issued & (CEPH_CAP_FILE_WR |
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CEPH_CAP_FILE_BUFFER |
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CEPH_CAP_FILE_EXCL))
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break;
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}
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return mds;
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}
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int ceph_get_cap_mds(struct inode *inode)
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{
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int mds;
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spin_lock(&inode->i_lock);
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mds = __ceph_get_cap_mds(ceph_inode(inode));
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spin_unlock(&inode->i_lock);
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return mds;
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}
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/*
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* Called under i_lock.
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*/
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static void __insert_cap_node(struct ceph_inode_info *ci,
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struct ceph_cap *new)
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{
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struct rb_node **p = &ci->i_caps.rb_node;
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struct rb_node *parent = NULL;
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struct ceph_cap *cap = NULL;
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while (*p) {
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parent = *p;
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cap = rb_entry(parent, struct ceph_cap, ci_node);
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if (new->mds < cap->mds)
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p = &(*p)->rb_left;
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else if (new->mds > cap->mds)
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p = &(*p)->rb_right;
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else
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BUG();
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}
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rb_link_node(&new->ci_node, parent, p);
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rb_insert_color(&new->ci_node, &ci->i_caps);
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}
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/*
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* (re)set cap hold timeouts, which control the delayed release
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* of unused caps back to the MDS. Should be called on cap use.
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*/
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static void __cap_set_timeouts(struct ceph_mds_client *mdsc,
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struct ceph_inode_info *ci)
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{
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struct ceph_mount_options *ma = mdsc->fsc->mount_options;
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ci->i_hold_caps_min = round_jiffies(jiffies +
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ma->caps_wanted_delay_min * HZ);
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ci->i_hold_caps_max = round_jiffies(jiffies +
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ma->caps_wanted_delay_max * HZ);
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dout("__cap_set_timeouts %p min %lu max %lu\n", &ci->vfs_inode,
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ci->i_hold_caps_min - jiffies, ci->i_hold_caps_max - jiffies);
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}
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/*
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* (Re)queue cap at the end of the delayed cap release list.
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*
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* If I_FLUSH is set, leave the inode at the front of the list.
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*
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* Caller holds i_lock
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* -> we take mdsc->cap_delay_lock
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*/
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static void __cap_delay_requeue(struct ceph_mds_client *mdsc,
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struct ceph_inode_info *ci)
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{
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__cap_set_timeouts(mdsc, ci);
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dout("__cap_delay_requeue %p flags %d at %lu\n", &ci->vfs_inode,
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ci->i_ceph_flags, ci->i_hold_caps_max);
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if (!mdsc->stopping) {
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spin_lock(&mdsc->cap_delay_lock);
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if (!list_empty(&ci->i_cap_delay_list)) {
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if (ci->i_ceph_flags & CEPH_I_FLUSH)
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goto no_change;
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list_del_init(&ci->i_cap_delay_list);
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}
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list_add_tail(&ci->i_cap_delay_list, &mdsc->cap_delay_list);
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no_change:
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spin_unlock(&mdsc->cap_delay_lock);
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}
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}
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/*
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* Queue an inode for immediate writeback. Mark inode with I_FLUSH,
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* indicating we should send a cap message to flush dirty metadata
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* asap, and move to the front of the delayed cap list.
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*/
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static void __cap_delay_requeue_front(struct ceph_mds_client *mdsc,
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struct ceph_inode_info *ci)
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{
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dout("__cap_delay_requeue_front %p\n", &ci->vfs_inode);
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spin_lock(&mdsc->cap_delay_lock);
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ci->i_ceph_flags |= CEPH_I_FLUSH;
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if (!list_empty(&ci->i_cap_delay_list))
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list_del_init(&ci->i_cap_delay_list);
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list_add(&ci->i_cap_delay_list, &mdsc->cap_delay_list);
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spin_unlock(&mdsc->cap_delay_lock);
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}
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/*
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* Cancel delayed work on cap.
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*
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* Caller must hold i_lock.
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*/
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static void __cap_delay_cancel(struct ceph_mds_client *mdsc,
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struct ceph_inode_info *ci)
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{
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dout("__cap_delay_cancel %p\n", &ci->vfs_inode);
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if (list_empty(&ci->i_cap_delay_list))
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return;
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spin_lock(&mdsc->cap_delay_lock);
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list_del_init(&ci->i_cap_delay_list);
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spin_unlock(&mdsc->cap_delay_lock);
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}
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|
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/*
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* Common issue checks for add_cap, handle_cap_grant.
|
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*/
|
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static void __check_cap_issue(struct ceph_inode_info *ci, struct ceph_cap *cap,
|
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unsigned issued)
|
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{
|
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unsigned had = __ceph_caps_issued(ci, NULL);
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|
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/*
|
|
* Each time we receive FILE_CACHE anew, we increment
|
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* i_rdcache_gen.
|
|
*/
|
|
if ((issued & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) &&
|
|
(had & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) == 0)
|
|
ci->i_rdcache_gen++;
|
|
|
|
/*
|
|
* if we are newly issued FILE_SHARED, clear I_COMPLETE; we
|
|
* don't know what happened to this directory while we didn't
|
|
* have the cap.
|
|
*/
|
|
if ((issued & CEPH_CAP_FILE_SHARED) &&
|
|
(had & CEPH_CAP_FILE_SHARED) == 0) {
|
|
ci->i_shared_gen++;
|
|
if (S_ISDIR(ci->vfs_inode.i_mode)) {
|
|
dout(" marking %p NOT complete\n", &ci->vfs_inode);
|
|
ci->i_ceph_flags &= ~CEPH_I_COMPLETE;
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Add a capability under the given MDS session.
|
|
*
|
|
* Caller should hold session snap_rwsem (read) and s_mutex.
|
|
*
|
|
* @fmode is the open file mode, if we are opening a file, otherwise
|
|
* it is < 0. (This is so we can atomically add the cap and add an
|
|
* open file reference to it.)
|
|
*/
|
|
int ceph_add_cap(struct inode *inode,
|
|
struct ceph_mds_session *session, u64 cap_id,
|
|
int fmode, unsigned issued, unsigned wanted,
|
|
unsigned seq, unsigned mseq, u64 realmino, int flags,
|
|
struct ceph_cap_reservation *caps_reservation)
|
|
{
|
|
struct ceph_mds_client *mdsc = ceph_inode_to_client(inode)->mdsc;
|
|
struct ceph_inode_info *ci = ceph_inode(inode);
|
|
struct ceph_cap *new_cap = NULL;
|
|
struct ceph_cap *cap;
|
|
int mds = session->s_mds;
|
|
int actual_wanted;
|
|
|
|
dout("add_cap %p mds%d cap %llx %s seq %d\n", inode,
|
|
session->s_mds, cap_id, ceph_cap_string(issued), seq);
|
|
|
|
/*
|
|
* If we are opening the file, include file mode wanted bits
|
|
* in wanted.
|
|
*/
|
|
if (fmode >= 0)
|
|
wanted |= ceph_caps_for_mode(fmode);
|
|
|
|
retry:
|
|
spin_lock(&inode->i_lock);
|
|
cap = __get_cap_for_mds(ci, mds);
|
|
if (!cap) {
|
|
if (new_cap) {
|
|
cap = new_cap;
|
|
new_cap = NULL;
|
|
} else {
|
|
spin_unlock(&inode->i_lock);
|
|
new_cap = get_cap(mdsc, caps_reservation);
|
|
if (new_cap == NULL)
|
|
return -ENOMEM;
|
|
goto retry;
|
|
}
|
|
|
|
cap->issued = 0;
|
|
cap->implemented = 0;
|
|
cap->mds = mds;
|
|
cap->mds_wanted = 0;
|
|
|
|
cap->ci = ci;
|
|
__insert_cap_node(ci, cap);
|
|
|
|
/* clear out old exporting info? (i.e. on cap import) */
|
|
if (ci->i_cap_exporting_mds == mds) {
|
|
ci->i_cap_exporting_issued = 0;
|
|
ci->i_cap_exporting_mseq = 0;
|
|
ci->i_cap_exporting_mds = -1;
|
|
}
|
|
|
|
/* add to session cap list */
|
|
cap->session = session;
|
|
spin_lock(&session->s_cap_lock);
|
|
list_add_tail(&cap->session_caps, &session->s_caps);
|
|
session->s_nr_caps++;
|
|
spin_unlock(&session->s_cap_lock);
|
|
}
|
|
|
|
if (!ci->i_snap_realm) {
|
|
/*
|
|
* add this inode to the appropriate snap realm
|
|
*/
|
|
struct ceph_snap_realm *realm = ceph_lookup_snap_realm(mdsc,
|
|
realmino);
|
|
if (realm) {
|
|
ceph_get_snap_realm(mdsc, realm);
|
|
spin_lock(&realm->inodes_with_caps_lock);
|
|
ci->i_snap_realm = realm;
|
|
list_add(&ci->i_snap_realm_item,
|
|
&realm->inodes_with_caps);
|
|
spin_unlock(&realm->inodes_with_caps_lock);
|
|
} else {
|
|
pr_err("ceph_add_cap: couldn't find snap realm %llx\n",
|
|
realmino);
|
|
WARN_ON(!realm);
|
|
}
|
|
}
|
|
|
|
__check_cap_issue(ci, cap, issued);
|
|
|
|
/*
|
|
* If we are issued caps we don't want, or the mds' wanted
|
|
* value appears to be off, queue a check so we'll release
|
|
* later and/or update the mds wanted value.
|
|
*/
|
|
actual_wanted = __ceph_caps_wanted(ci);
|
|
if ((wanted & ~actual_wanted) ||
|
|
(issued & ~actual_wanted & CEPH_CAP_ANY_WR)) {
|
|
dout(" issued %s, mds wanted %s, actual %s, queueing\n",
|
|
ceph_cap_string(issued), ceph_cap_string(wanted),
|
|
ceph_cap_string(actual_wanted));
|
|
__cap_delay_requeue(mdsc, ci);
|
|
}
|
|
|
|
if (flags & CEPH_CAP_FLAG_AUTH)
|
|
ci->i_auth_cap = cap;
|
|
else if (ci->i_auth_cap == cap)
|
|
ci->i_auth_cap = NULL;
|
|
|
|
dout("add_cap inode %p (%llx.%llx) cap %p %s now %s seq %d mds%d\n",
|
|
inode, ceph_vinop(inode), cap, ceph_cap_string(issued),
|
|
ceph_cap_string(issued|cap->issued), seq, mds);
|
|
cap->cap_id = cap_id;
|
|
cap->issued = issued;
|
|
cap->implemented |= issued;
|
|
cap->mds_wanted |= wanted;
|
|
cap->seq = seq;
|
|
cap->issue_seq = seq;
|
|
cap->mseq = mseq;
|
|
cap->cap_gen = session->s_cap_gen;
|
|
|
|
if (fmode >= 0)
|
|
__ceph_get_fmode(ci, fmode);
|
|
spin_unlock(&inode->i_lock);
|
|
wake_up_all(&ci->i_cap_wq);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Return true if cap has not timed out and belongs to the current
|
|
* generation of the MDS session (i.e. has not gone 'stale' due to
|
|
* us losing touch with the mds).
|
|
*/
|
|
static int __cap_is_valid(struct ceph_cap *cap)
|
|
{
|
|
unsigned long ttl;
|
|
u32 gen;
|
|
|
|
spin_lock(&cap->session->s_cap_lock);
|
|
gen = cap->session->s_cap_gen;
|
|
ttl = cap->session->s_cap_ttl;
|
|
spin_unlock(&cap->session->s_cap_lock);
|
|
|
|
if (cap->cap_gen < gen || time_after_eq(jiffies, ttl)) {
|
|
dout("__cap_is_valid %p cap %p issued %s "
|
|
"but STALE (gen %u vs %u)\n", &cap->ci->vfs_inode,
|
|
cap, ceph_cap_string(cap->issued), cap->cap_gen, gen);
|
|
return 0;
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* Return set of valid cap bits issued to us. Note that caps time
|
|
* out, and may be invalidated in bulk if the client session times out
|
|
* and session->s_cap_gen is bumped.
|
|
*/
|
|
int __ceph_caps_issued(struct ceph_inode_info *ci, int *implemented)
|
|
{
|
|
int have = ci->i_snap_caps | ci->i_cap_exporting_issued;
|
|
struct ceph_cap *cap;
|
|
struct rb_node *p;
|
|
|
|
if (implemented)
|
|
*implemented = 0;
|
|
for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
|
|
cap = rb_entry(p, struct ceph_cap, ci_node);
|
|
if (!__cap_is_valid(cap))
|
|
continue;
|
|
dout("__ceph_caps_issued %p cap %p issued %s\n",
|
|
&ci->vfs_inode, cap, ceph_cap_string(cap->issued));
|
|
have |= cap->issued;
|
|
if (implemented)
|
|
*implemented |= cap->implemented;
|
|
}
|
|
return have;
|
|
}
|
|
|
|
/*
|
|
* Get cap bits issued by caps other than @ocap
|
|
*/
|
|
int __ceph_caps_issued_other(struct ceph_inode_info *ci, struct ceph_cap *ocap)
|
|
{
|
|
int have = ci->i_snap_caps;
|
|
struct ceph_cap *cap;
|
|
struct rb_node *p;
|
|
|
|
for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
|
|
cap = rb_entry(p, struct ceph_cap, ci_node);
|
|
if (cap == ocap)
|
|
continue;
|
|
if (!__cap_is_valid(cap))
|
|
continue;
|
|
have |= cap->issued;
|
|
}
|
|
return have;
|
|
}
|
|
|
|
/*
|
|
* Move a cap to the end of the LRU (oldest caps at list head, newest
|
|
* at list tail).
|
|
*/
|
|
static void __touch_cap(struct ceph_cap *cap)
|
|
{
|
|
struct ceph_mds_session *s = cap->session;
|
|
|
|
spin_lock(&s->s_cap_lock);
|
|
if (s->s_cap_iterator == NULL) {
|
|
dout("__touch_cap %p cap %p mds%d\n", &cap->ci->vfs_inode, cap,
|
|
s->s_mds);
|
|
list_move_tail(&cap->session_caps, &s->s_caps);
|
|
} else {
|
|
dout("__touch_cap %p cap %p mds%d NOP, iterating over caps\n",
|
|
&cap->ci->vfs_inode, cap, s->s_mds);
|
|
}
|
|
spin_unlock(&s->s_cap_lock);
|
|
}
|
|
|
|
/*
|
|
* Check if we hold the given mask. If so, move the cap(s) to the
|
|
* front of their respective LRUs. (This is the preferred way for
|
|
* callers to check for caps they want.)
|
|
*/
|
|
int __ceph_caps_issued_mask(struct ceph_inode_info *ci, int mask, int touch)
|
|
{
|
|
struct ceph_cap *cap;
|
|
struct rb_node *p;
|
|
int have = ci->i_snap_caps;
|
|
|
|
if ((have & mask) == mask) {
|
|
dout("__ceph_caps_issued_mask %p snap issued %s"
|
|
" (mask %s)\n", &ci->vfs_inode,
|
|
ceph_cap_string(have),
|
|
ceph_cap_string(mask));
|
|
return 1;
|
|
}
|
|
|
|
for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
|
|
cap = rb_entry(p, struct ceph_cap, ci_node);
|
|
if (!__cap_is_valid(cap))
|
|
continue;
|
|
if ((cap->issued & mask) == mask) {
|
|
dout("__ceph_caps_issued_mask %p cap %p issued %s"
|
|
" (mask %s)\n", &ci->vfs_inode, cap,
|
|
ceph_cap_string(cap->issued),
|
|
ceph_cap_string(mask));
|
|
if (touch)
|
|
__touch_cap(cap);
|
|
return 1;
|
|
}
|
|
|
|
/* does a combination of caps satisfy mask? */
|
|
have |= cap->issued;
|
|
if ((have & mask) == mask) {
|
|
dout("__ceph_caps_issued_mask %p combo issued %s"
|
|
" (mask %s)\n", &ci->vfs_inode,
|
|
ceph_cap_string(cap->issued),
|
|
ceph_cap_string(mask));
|
|
if (touch) {
|
|
struct rb_node *q;
|
|
|
|
/* touch this + preceeding caps */
|
|
__touch_cap(cap);
|
|
for (q = rb_first(&ci->i_caps); q != p;
|
|
q = rb_next(q)) {
|
|
cap = rb_entry(q, struct ceph_cap,
|
|
ci_node);
|
|
if (!__cap_is_valid(cap))
|
|
continue;
|
|
__touch_cap(cap);
|
|
}
|
|
}
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Return true if mask caps are currently being revoked by an MDS.
|
|
*/
|
|
int ceph_caps_revoking(struct ceph_inode_info *ci, int mask)
|
|
{
|
|
struct inode *inode = &ci->vfs_inode;
|
|
struct ceph_cap *cap;
|
|
struct rb_node *p;
|
|
int ret = 0;
|
|
|
|
spin_lock(&inode->i_lock);
|
|
for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
|
|
cap = rb_entry(p, struct ceph_cap, ci_node);
|
|
if (__cap_is_valid(cap) &&
|
|
(cap->implemented & ~cap->issued & mask)) {
|
|
ret = 1;
|
|
break;
|
|
}
|
|
}
|
|
spin_unlock(&inode->i_lock);
|
|
dout("ceph_caps_revoking %p %s = %d\n", inode,
|
|
ceph_cap_string(mask), ret);
|
|
return ret;
|
|
}
|
|
|
|
int __ceph_caps_used(struct ceph_inode_info *ci)
|
|
{
|
|
int used = 0;
|
|
if (ci->i_pin_ref)
|
|
used |= CEPH_CAP_PIN;
|
|
if (ci->i_rd_ref)
|
|
used |= CEPH_CAP_FILE_RD;
|
|
if (ci->i_rdcache_ref || ci->vfs_inode.i_data.nrpages)
|
|
used |= CEPH_CAP_FILE_CACHE;
|
|
if (ci->i_wr_ref)
|
|
used |= CEPH_CAP_FILE_WR;
|
|
if (ci->i_wrbuffer_ref)
|
|
used |= CEPH_CAP_FILE_BUFFER;
|
|
return used;
|
|
}
|
|
|
|
/*
|
|
* wanted, by virtue of open file modes
|
|
*/
|
|
int __ceph_caps_file_wanted(struct ceph_inode_info *ci)
|
|
{
|
|
int want = 0;
|
|
int mode;
|
|
for (mode = 0; mode < CEPH_FILE_MODE_NUM; mode++)
|
|
if (ci->i_nr_by_mode[mode])
|
|
want |= ceph_caps_for_mode(mode);
|
|
return want;
|
|
}
|
|
|
|
/*
|
|
* Return caps we have registered with the MDS(s) as 'wanted'.
|
|
*/
|
|
int __ceph_caps_mds_wanted(struct ceph_inode_info *ci)
|
|
{
|
|
struct ceph_cap *cap;
|
|
struct rb_node *p;
|
|
int mds_wanted = 0;
|
|
|
|
for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
|
|
cap = rb_entry(p, struct ceph_cap, ci_node);
|
|
if (!__cap_is_valid(cap))
|
|
continue;
|
|
mds_wanted |= cap->mds_wanted;
|
|
}
|
|
return mds_wanted;
|
|
}
|
|
|
|
/*
|
|
* called under i_lock
|
|
*/
|
|
static int __ceph_is_any_caps(struct ceph_inode_info *ci)
|
|
{
|
|
return !RB_EMPTY_ROOT(&ci->i_caps) || ci->i_cap_exporting_mds >= 0;
|
|
}
|
|
|
|
/*
|
|
* Remove a cap. Take steps to deal with a racing iterate_session_caps.
|
|
*
|
|
* caller should hold i_lock.
|
|
* caller will not hold session s_mutex if called from destroy_inode.
|
|
*/
|
|
void __ceph_remove_cap(struct ceph_cap *cap)
|
|
{
|
|
struct ceph_mds_session *session = cap->session;
|
|
struct ceph_inode_info *ci = cap->ci;
|
|
struct ceph_mds_client *mdsc =
|
|
ceph_sb_to_client(ci->vfs_inode.i_sb)->mdsc;
|
|
int removed = 0;
|
|
|
|
dout("__ceph_remove_cap %p from %p\n", cap, &ci->vfs_inode);
|
|
|
|
/* remove from session list */
|
|
spin_lock(&session->s_cap_lock);
|
|
if (session->s_cap_iterator == cap) {
|
|
/* not yet, we are iterating over this very cap */
|
|
dout("__ceph_remove_cap delaying %p removal from session %p\n",
|
|
cap, cap->session);
|
|
} else {
|
|
list_del_init(&cap->session_caps);
|
|
session->s_nr_caps--;
|
|
cap->session = NULL;
|
|
removed = 1;
|
|
}
|
|
/* protect backpointer with s_cap_lock: see iterate_session_caps */
|
|
cap->ci = NULL;
|
|
spin_unlock(&session->s_cap_lock);
|
|
|
|
/* remove from inode list */
|
|
rb_erase(&cap->ci_node, &ci->i_caps);
|
|
if (ci->i_auth_cap == cap)
|
|
ci->i_auth_cap = NULL;
|
|
|
|
if (removed)
|
|
ceph_put_cap(mdsc, cap);
|
|
|
|
if (!__ceph_is_any_caps(ci) && ci->i_snap_realm) {
|
|
struct ceph_snap_realm *realm = ci->i_snap_realm;
|
|
spin_lock(&realm->inodes_with_caps_lock);
|
|
list_del_init(&ci->i_snap_realm_item);
|
|
ci->i_snap_realm_counter++;
|
|
ci->i_snap_realm = NULL;
|
|
spin_unlock(&realm->inodes_with_caps_lock);
|
|
ceph_put_snap_realm(mdsc, realm);
|
|
}
|
|
if (!__ceph_is_any_real_caps(ci))
|
|
__cap_delay_cancel(mdsc, ci);
|
|
}
|
|
|
|
/*
|
|
* Build and send a cap message to the given MDS.
|
|
*
|
|
* Caller should be holding s_mutex.
|
|
*/
|
|
static int send_cap_msg(struct ceph_mds_session *session,
|
|
u64 ino, u64 cid, int op,
|
|
int caps, int wanted, int dirty,
|
|
u32 seq, u64 flush_tid, u32 issue_seq, u32 mseq,
|
|
u64 size, u64 max_size,
|
|
struct timespec *mtime, struct timespec *atime,
|
|
u64 time_warp_seq,
|
|
uid_t uid, gid_t gid, mode_t mode,
|
|
u64 xattr_version,
|
|
struct ceph_buffer *xattrs_buf,
|
|
u64 follows)
|
|
{
|
|
struct ceph_mds_caps *fc;
|
|
struct ceph_msg *msg;
|
|
|
|
dout("send_cap_msg %s %llx %llx caps %s wanted %s dirty %s"
|
|
" seq %u/%u mseq %u follows %lld size %llu/%llu"
|
|
" xattr_ver %llu xattr_len %d\n", ceph_cap_op_name(op),
|
|
cid, ino, ceph_cap_string(caps), ceph_cap_string(wanted),
|
|
ceph_cap_string(dirty),
|
|
seq, issue_seq, mseq, follows, size, max_size,
|
|
xattr_version, xattrs_buf ? (int)xattrs_buf->vec.iov_len : 0);
|
|
|
|
msg = ceph_msg_new(CEPH_MSG_CLIENT_CAPS, sizeof(*fc), GFP_NOFS);
|
|
if (!msg)
|
|
return -ENOMEM;
|
|
|
|
msg->hdr.tid = cpu_to_le64(flush_tid);
|
|
|
|
fc = msg->front.iov_base;
|
|
memset(fc, 0, sizeof(*fc));
|
|
|
|
fc->cap_id = cpu_to_le64(cid);
|
|
fc->op = cpu_to_le32(op);
|
|
fc->seq = cpu_to_le32(seq);
|
|
fc->issue_seq = cpu_to_le32(issue_seq);
|
|
fc->migrate_seq = cpu_to_le32(mseq);
|
|
fc->caps = cpu_to_le32(caps);
|
|
fc->wanted = cpu_to_le32(wanted);
|
|
fc->dirty = cpu_to_le32(dirty);
|
|
fc->ino = cpu_to_le64(ino);
|
|
fc->snap_follows = cpu_to_le64(follows);
|
|
|
|
fc->size = cpu_to_le64(size);
|
|
fc->max_size = cpu_to_le64(max_size);
|
|
if (mtime)
|
|
ceph_encode_timespec(&fc->mtime, mtime);
|
|
if (atime)
|
|
ceph_encode_timespec(&fc->atime, atime);
|
|
fc->time_warp_seq = cpu_to_le32(time_warp_seq);
|
|
|
|
fc->uid = cpu_to_le32(uid);
|
|
fc->gid = cpu_to_le32(gid);
|
|
fc->mode = cpu_to_le32(mode);
|
|
|
|
fc->xattr_version = cpu_to_le64(xattr_version);
|
|
if (xattrs_buf) {
|
|
msg->middle = ceph_buffer_get(xattrs_buf);
|
|
fc->xattr_len = cpu_to_le32(xattrs_buf->vec.iov_len);
|
|
msg->hdr.middle_len = cpu_to_le32(xattrs_buf->vec.iov_len);
|
|
}
|
|
|
|
ceph_con_send(&session->s_con, msg);
|
|
return 0;
|
|
}
|
|
|
|
static void __queue_cap_release(struct ceph_mds_session *session,
|
|
u64 ino, u64 cap_id, u32 migrate_seq,
|
|
u32 issue_seq)
|
|
{
|
|
struct ceph_msg *msg;
|
|
struct ceph_mds_cap_release *head;
|
|
struct ceph_mds_cap_item *item;
|
|
|
|
spin_lock(&session->s_cap_lock);
|
|
BUG_ON(!session->s_num_cap_releases);
|
|
msg = list_first_entry(&session->s_cap_releases,
|
|
struct ceph_msg, list_head);
|
|
|
|
dout(" adding %llx release to mds%d msg %p (%d left)\n",
|
|
ino, session->s_mds, msg, session->s_num_cap_releases);
|
|
|
|
BUG_ON(msg->front.iov_len + sizeof(*item) > PAGE_CACHE_SIZE);
|
|
head = msg->front.iov_base;
|
|
head->num = cpu_to_le32(le32_to_cpu(head->num) + 1);
|
|
item = msg->front.iov_base + msg->front.iov_len;
|
|
item->ino = cpu_to_le64(ino);
|
|
item->cap_id = cpu_to_le64(cap_id);
|
|
item->migrate_seq = cpu_to_le32(migrate_seq);
|
|
item->seq = cpu_to_le32(issue_seq);
|
|
|
|
session->s_num_cap_releases--;
|
|
|
|
msg->front.iov_len += sizeof(*item);
|
|
if (le32_to_cpu(head->num) == CEPH_CAPS_PER_RELEASE) {
|
|
dout(" release msg %p full\n", msg);
|
|
list_move_tail(&msg->list_head, &session->s_cap_releases_done);
|
|
} else {
|
|
dout(" release msg %p at %d/%d (%d)\n", msg,
|
|
(int)le32_to_cpu(head->num),
|
|
(int)CEPH_CAPS_PER_RELEASE,
|
|
(int)msg->front.iov_len);
|
|
}
|
|
spin_unlock(&session->s_cap_lock);
|
|
}
|
|
|
|
/*
|
|
* Queue cap releases when an inode is dropped from our cache. Since
|
|
* inode is about to be destroyed, there is no need for i_lock.
|
|
*/
|
|
void ceph_queue_caps_release(struct inode *inode)
|
|
{
|
|
struct ceph_inode_info *ci = ceph_inode(inode);
|
|
struct rb_node *p;
|
|
|
|
p = rb_first(&ci->i_caps);
|
|
while (p) {
|
|
struct ceph_cap *cap = rb_entry(p, struct ceph_cap, ci_node);
|
|
struct ceph_mds_session *session = cap->session;
|
|
|
|
__queue_cap_release(session, ceph_ino(inode), cap->cap_id,
|
|
cap->mseq, cap->issue_seq);
|
|
p = rb_next(p);
|
|
__ceph_remove_cap(cap);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Send a cap msg on the given inode. Update our caps state, then
|
|
* drop i_lock and send the message.
|
|
*
|
|
* Make note of max_size reported/requested from mds, revoked caps
|
|
* that have now been implemented.
|
|
*
|
|
* Make half-hearted attempt ot to invalidate page cache if we are
|
|
* dropping RDCACHE. Note that this will leave behind locked pages
|
|
* that we'll then need to deal with elsewhere.
|
|
*
|
|
* Return non-zero if delayed release, or we experienced an error
|
|
* such that the caller should requeue + retry later.
|
|
*
|
|
* called with i_lock, then drops it.
|
|
* caller should hold snap_rwsem (read), s_mutex.
|
|
*/
|
|
static int __send_cap(struct ceph_mds_client *mdsc, struct ceph_cap *cap,
|
|
int op, int used, int want, int retain, int flushing,
|
|
unsigned *pflush_tid)
|
|
__releases(cap->ci->vfs_inode->i_lock)
|
|
{
|
|
struct ceph_inode_info *ci = cap->ci;
|
|
struct inode *inode = &ci->vfs_inode;
|
|
u64 cap_id = cap->cap_id;
|
|
int held, revoking, dropping, keep;
|
|
u64 seq, issue_seq, mseq, time_warp_seq, follows;
|
|
u64 size, max_size;
|
|
struct timespec mtime, atime;
|
|
int wake = 0;
|
|
mode_t mode;
|
|
uid_t uid;
|
|
gid_t gid;
|
|
struct ceph_mds_session *session;
|
|
u64 xattr_version = 0;
|
|
struct ceph_buffer *xattr_blob = NULL;
|
|
int delayed = 0;
|
|
u64 flush_tid = 0;
|
|
int i;
|
|
int ret;
|
|
|
|
held = cap->issued | cap->implemented;
|
|
revoking = cap->implemented & ~cap->issued;
|
|
retain &= ~revoking;
|
|
dropping = cap->issued & ~retain;
|
|
|
|
dout("__send_cap %p cap %p session %p %s -> %s (revoking %s)\n",
|
|
inode, cap, cap->session,
|
|
ceph_cap_string(held), ceph_cap_string(held & retain),
|
|
ceph_cap_string(revoking));
|
|
BUG_ON((retain & CEPH_CAP_PIN) == 0);
|
|
|
|
session = cap->session;
|
|
|
|
/* don't release wanted unless we've waited a bit. */
|
|
if ((ci->i_ceph_flags & CEPH_I_NODELAY) == 0 &&
|
|
time_before(jiffies, ci->i_hold_caps_min)) {
|
|
dout(" delaying issued %s -> %s, wanted %s -> %s on send\n",
|
|
ceph_cap_string(cap->issued),
|
|
ceph_cap_string(cap->issued & retain),
|
|
ceph_cap_string(cap->mds_wanted),
|
|
ceph_cap_string(want));
|
|
want |= cap->mds_wanted;
|
|
retain |= cap->issued;
|
|
delayed = 1;
|
|
}
|
|
ci->i_ceph_flags &= ~(CEPH_I_NODELAY | CEPH_I_FLUSH);
|
|
|
|
cap->issued &= retain; /* drop bits we don't want */
|
|
if (cap->implemented & ~cap->issued) {
|
|
/*
|
|
* Wake up any waiters on wanted -> needed transition.
|
|
* This is due to the weird transition from buffered
|
|
* to sync IO... we need to flush dirty pages _before_
|
|
* allowing sync writes to avoid reordering.
|
|
*/
|
|
wake = 1;
|
|
}
|
|
cap->implemented &= cap->issued | used;
|
|
cap->mds_wanted = want;
|
|
|
|
if (flushing) {
|
|
/*
|
|
* assign a tid for flush operations so we can avoid
|
|
* flush1 -> dirty1 -> flush2 -> flushack1 -> mark
|
|
* clean type races. track latest tid for every bit
|
|
* so we can handle flush AxFw, flush Fw, and have the
|
|
* first ack clean Ax.
|
|
*/
|
|
flush_tid = ++ci->i_cap_flush_last_tid;
|
|
if (pflush_tid)
|
|
*pflush_tid = flush_tid;
|
|
dout(" cap_flush_tid %d\n", (int)flush_tid);
|
|
for (i = 0; i < CEPH_CAP_BITS; i++)
|
|
if (flushing & (1 << i))
|
|
ci->i_cap_flush_tid[i] = flush_tid;
|
|
|
|
follows = ci->i_head_snapc->seq;
|
|
} else {
|
|
follows = 0;
|
|
}
|
|
|
|
keep = cap->implemented;
|
|
seq = cap->seq;
|
|
issue_seq = cap->issue_seq;
|
|
mseq = cap->mseq;
|
|
size = inode->i_size;
|
|
ci->i_reported_size = size;
|
|
max_size = ci->i_wanted_max_size;
|
|
ci->i_requested_max_size = max_size;
|
|
mtime = inode->i_mtime;
|
|
atime = inode->i_atime;
|
|
time_warp_seq = ci->i_time_warp_seq;
|
|
uid = inode->i_uid;
|
|
gid = inode->i_gid;
|
|
mode = inode->i_mode;
|
|
|
|
if (flushing & CEPH_CAP_XATTR_EXCL) {
|
|
__ceph_build_xattrs_blob(ci);
|
|
xattr_blob = ci->i_xattrs.blob;
|
|
xattr_version = ci->i_xattrs.version;
|
|
}
|
|
|
|
spin_unlock(&inode->i_lock);
|
|
|
|
ret = send_cap_msg(session, ceph_vino(inode).ino, cap_id,
|
|
op, keep, want, flushing, seq, flush_tid, issue_seq, mseq,
|
|
size, max_size, &mtime, &atime, time_warp_seq,
|
|
uid, gid, mode, xattr_version, xattr_blob,
|
|
follows);
|
|
if (ret < 0) {
|
|
dout("error sending cap msg, must requeue %p\n", inode);
|
|
delayed = 1;
|
|
}
|
|
|
|
if (wake)
|
|
wake_up_all(&ci->i_cap_wq);
|
|
|
|
return delayed;
|
|
}
|
|
|
|
/*
|
|
* When a snapshot is taken, clients accumulate dirty metadata on
|
|
* inodes with capabilities in ceph_cap_snaps to describe the file
|
|
* state at the time the snapshot was taken. This must be flushed
|
|
* asynchronously back to the MDS once sync writes complete and dirty
|
|
* data is written out.
|
|
*
|
|
* Unless @again is true, skip cap_snaps that were already sent to
|
|
* the MDS (i.e., during this session).
|
|
*
|
|
* Called under i_lock. Takes s_mutex as needed.
|
|
*/
|
|
void __ceph_flush_snaps(struct ceph_inode_info *ci,
|
|
struct ceph_mds_session **psession,
|
|
int again)
|
|
__releases(ci->vfs_inode->i_lock)
|
|
__acquires(ci->vfs_inode->i_lock)
|
|
{
|
|
struct inode *inode = &ci->vfs_inode;
|
|
int mds;
|
|
struct ceph_cap_snap *capsnap;
|
|
u32 mseq;
|
|
struct ceph_mds_client *mdsc = ceph_inode_to_client(inode)->mdsc;
|
|
struct ceph_mds_session *session = NULL; /* if session != NULL, we hold
|
|
session->s_mutex */
|
|
u64 next_follows = 0; /* keep track of how far we've gotten through the
|
|
i_cap_snaps list, and skip these entries next time
|
|
around to avoid an infinite loop */
|
|
|
|
if (psession)
|
|
session = *psession;
|
|
|
|
dout("__flush_snaps %p\n", inode);
|
|
retry:
|
|
list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) {
|
|
/* avoid an infiniute loop after retry */
|
|
if (capsnap->follows < next_follows)
|
|
continue;
|
|
/*
|
|
* we need to wait for sync writes to complete and for dirty
|
|
* pages to be written out.
|
|
*/
|
|
if (capsnap->dirty_pages || capsnap->writing)
|
|
break;
|
|
|
|
/*
|
|
* if cap writeback already occurred, we should have dropped
|
|
* the capsnap in ceph_put_wrbuffer_cap_refs.
|
|
*/
|
|
BUG_ON(capsnap->dirty == 0);
|
|
|
|
/* pick mds, take s_mutex */
|
|
if (ci->i_auth_cap == NULL) {
|
|
dout("no auth cap (migrating?), doing nothing\n");
|
|
goto out;
|
|
}
|
|
|
|
/* only flush each capsnap once */
|
|
if (!again && !list_empty(&capsnap->flushing_item)) {
|
|
dout("already flushed %p, skipping\n", capsnap);
|
|
continue;
|
|
}
|
|
|
|
mds = ci->i_auth_cap->session->s_mds;
|
|
mseq = ci->i_auth_cap->mseq;
|
|
|
|
if (session && session->s_mds != mds) {
|
|
dout("oops, wrong session %p mutex\n", session);
|
|
mutex_unlock(&session->s_mutex);
|
|
ceph_put_mds_session(session);
|
|
session = NULL;
|
|
}
|
|
if (!session) {
|
|
spin_unlock(&inode->i_lock);
|
|
mutex_lock(&mdsc->mutex);
|
|
session = __ceph_lookup_mds_session(mdsc, mds);
|
|
mutex_unlock(&mdsc->mutex);
|
|
if (session) {
|
|
dout("inverting session/ino locks on %p\n",
|
|
session);
|
|
mutex_lock(&session->s_mutex);
|
|
}
|
|
/*
|
|
* if session == NULL, we raced against a cap
|
|
* deletion or migration. retry, and we'll
|
|
* get a better @mds value next time.
|
|
*/
|
|
spin_lock(&inode->i_lock);
|
|
goto retry;
|
|
}
|
|
|
|
capsnap->flush_tid = ++ci->i_cap_flush_last_tid;
|
|
atomic_inc(&capsnap->nref);
|
|
if (!list_empty(&capsnap->flushing_item))
|
|
list_del_init(&capsnap->flushing_item);
|
|
list_add_tail(&capsnap->flushing_item,
|
|
&session->s_cap_snaps_flushing);
|
|
spin_unlock(&inode->i_lock);
|
|
|
|
dout("flush_snaps %p cap_snap %p follows %lld tid %llu\n",
|
|
inode, capsnap, capsnap->follows, capsnap->flush_tid);
|
|
send_cap_msg(session, ceph_vino(inode).ino, 0,
|
|
CEPH_CAP_OP_FLUSHSNAP, capsnap->issued, 0,
|
|
capsnap->dirty, 0, capsnap->flush_tid, 0, mseq,
|
|
capsnap->size, 0,
|
|
&capsnap->mtime, &capsnap->atime,
|
|
capsnap->time_warp_seq,
|
|
capsnap->uid, capsnap->gid, capsnap->mode,
|
|
capsnap->xattr_version, capsnap->xattr_blob,
|
|
capsnap->follows);
|
|
|
|
next_follows = capsnap->follows + 1;
|
|
ceph_put_cap_snap(capsnap);
|
|
|
|
spin_lock(&inode->i_lock);
|
|
goto retry;
|
|
}
|
|
|
|
/* we flushed them all; remove this inode from the queue */
|
|
spin_lock(&mdsc->snap_flush_lock);
|
|
list_del_init(&ci->i_snap_flush_item);
|
|
spin_unlock(&mdsc->snap_flush_lock);
|
|
|
|
out:
|
|
if (psession)
|
|
*psession = session;
|
|
else if (session) {
|
|
mutex_unlock(&session->s_mutex);
|
|
ceph_put_mds_session(session);
|
|
}
|
|
}
|
|
|
|
static void ceph_flush_snaps(struct ceph_inode_info *ci)
|
|
{
|
|
struct inode *inode = &ci->vfs_inode;
|
|
|
|
spin_lock(&inode->i_lock);
|
|
__ceph_flush_snaps(ci, NULL, 0);
|
|
spin_unlock(&inode->i_lock);
|
|
}
|
|
|
|
/*
|
|
* Mark caps dirty. If inode is newly dirty, add to the global dirty
|
|
* list.
|
|
*/
|
|
void __ceph_mark_dirty_caps(struct ceph_inode_info *ci, int mask)
|
|
{
|
|
struct ceph_mds_client *mdsc =
|
|
ceph_sb_to_client(ci->vfs_inode.i_sb)->mdsc;
|
|
struct inode *inode = &ci->vfs_inode;
|
|
int was = ci->i_dirty_caps;
|
|
int dirty = 0;
|
|
|
|
dout("__mark_dirty_caps %p %s dirty %s -> %s\n", &ci->vfs_inode,
|
|
ceph_cap_string(mask), ceph_cap_string(was),
|
|
ceph_cap_string(was | mask));
|
|
ci->i_dirty_caps |= mask;
|
|
if (was == 0) {
|
|
if (!ci->i_head_snapc)
|
|
ci->i_head_snapc = ceph_get_snap_context(
|
|
ci->i_snap_realm->cached_context);
|
|
dout(" inode %p now dirty snapc %p\n", &ci->vfs_inode,
|
|
ci->i_head_snapc);
|
|
BUG_ON(!list_empty(&ci->i_dirty_item));
|
|
spin_lock(&mdsc->cap_dirty_lock);
|
|
list_add(&ci->i_dirty_item, &mdsc->cap_dirty);
|
|
spin_unlock(&mdsc->cap_dirty_lock);
|
|
if (ci->i_flushing_caps == 0) {
|
|
igrab(inode);
|
|
dirty |= I_DIRTY_SYNC;
|
|
}
|
|
}
|
|
BUG_ON(list_empty(&ci->i_dirty_item));
|
|
if (((was | ci->i_flushing_caps) & CEPH_CAP_FILE_BUFFER) &&
|
|
(mask & CEPH_CAP_FILE_BUFFER))
|
|
dirty |= I_DIRTY_DATASYNC;
|
|
if (dirty)
|
|
__mark_inode_dirty(inode, dirty);
|
|
__cap_delay_requeue(mdsc, ci);
|
|
}
|
|
|
|
/*
|
|
* Add dirty inode to the flushing list. Assigned a seq number so we
|
|
* can wait for caps to flush without starving.
|
|
*
|
|
* Called under i_lock.
|
|
*/
|
|
static int __mark_caps_flushing(struct inode *inode,
|
|
struct ceph_mds_session *session)
|
|
{
|
|
struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
|
|
struct ceph_inode_info *ci = ceph_inode(inode);
|
|
int flushing;
|
|
|
|
BUG_ON(ci->i_dirty_caps == 0);
|
|
BUG_ON(list_empty(&ci->i_dirty_item));
|
|
|
|
flushing = ci->i_dirty_caps;
|
|
dout("__mark_caps_flushing flushing %s, flushing_caps %s -> %s\n",
|
|
ceph_cap_string(flushing),
|
|
ceph_cap_string(ci->i_flushing_caps),
|
|
ceph_cap_string(ci->i_flushing_caps | flushing));
|
|
ci->i_flushing_caps |= flushing;
|
|
ci->i_dirty_caps = 0;
|
|
dout(" inode %p now !dirty\n", inode);
|
|
|
|
spin_lock(&mdsc->cap_dirty_lock);
|
|
list_del_init(&ci->i_dirty_item);
|
|
|
|
ci->i_cap_flush_seq = ++mdsc->cap_flush_seq;
|
|
if (list_empty(&ci->i_flushing_item)) {
|
|
list_add_tail(&ci->i_flushing_item, &session->s_cap_flushing);
|
|
mdsc->num_cap_flushing++;
|
|
dout(" inode %p now flushing seq %lld\n", inode,
|
|
ci->i_cap_flush_seq);
|
|
} else {
|
|
list_move_tail(&ci->i_flushing_item, &session->s_cap_flushing);
|
|
dout(" inode %p now flushing (more) seq %lld\n", inode,
|
|
ci->i_cap_flush_seq);
|
|
}
|
|
spin_unlock(&mdsc->cap_dirty_lock);
|
|
|
|
return flushing;
|
|
}
|
|
|
|
/*
|
|
* try to invalidate mapping pages without blocking.
|
|
*/
|
|
static int try_nonblocking_invalidate(struct inode *inode)
|
|
{
|
|
struct ceph_inode_info *ci = ceph_inode(inode);
|
|
u32 invalidating_gen = ci->i_rdcache_gen;
|
|
|
|
spin_unlock(&inode->i_lock);
|
|
invalidate_mapping_pages(&inode->i_data, 0, -1);
|
|
spin_lock(&inode->i_lock);
|
|
|
|
if (inode->i_data.nrpages == 0 &&
|
|
invalidating_gen == ci->i_rdcache_gen) {
|
|
/* success. */
|
|
dout("try_nonblocking_invalidate %p success\n", inode);
|
|
/* save any racing async invalidate some trouble */
|
|
ci->i_rdcache_revoking = ci->i_rdcache_gen - 1;
|
|
return 0;
|
|
}
|
|
dout("try_nonblocking_invalidate %p failed\n", inode);
|
|
return -1;
|
|
}
|
|
|
|
/*
|
|
* Swiss army knife function to examine currently used and wanted
|
|
* versus held caps. Release, flush, ack revoked caps to mds as
|
|
* appropriate.
|
|
*
|
|
* CHECK_CAPS_NODELAY - caller is delayed work and we should not delay
|
|
* cap release further.
|
|
* CHECK_CAPS_AUTHONLY - we should only check the auth cap
|
|
* CHECK_CAPS_FLUSH - we should flush any dirty caps immediately, without
|
|
* further delay.
|
|
*/
|
|
void ceph_check_caps(struct ceph_inode_info *ci, int flags,
|
|
struct ceph_mds_session *session)
|
|
{
|
|
struct ceph_fs_client *fsc = ceph_inode_to_client(&ci->vfs_inode);
|
|
struct ceph_mds_client *mdsc = fsc->mdsc;
|
|
struct inode *inode = &ci->vfs_inode;
|
|
struct ceph_cap *cap;
|
|
int file_wanted, used;
|
|
int took_snap_rwsem = 0; /* true if mdsc->snap_rwsem held */
|
|
int issued, implemented, want, retain, revoking, flushing = 0;
|
|
int mds = -1; /* keep track of how far we've gone through i_caps list
|
|
to avoid an infinite loop on retry */
|
|
struct rb_node *p;
|
|
int tried_invalidate = 0;
|
|
int delayed = 0, sent = 0, force_requeue = 0, num;
|
|
int queue_invalidate = 0;
|
|
int is_delayed = flags & CHECK_CAPS_NODELAY;
|
|
|
|
/* if we are unmounting, flush any unused caps immediately. */
|
|
if (mdsc->stopping)
|
|
is_delayed = 1;
|
|
|
|
spin_lock(&inode->i_lock);
|
|
|
|
if (ci->i_ceph_flags & CEPH_I_FLUSH)
|
|
flags |= CHECK_CAPS_FLUSH;
|
|
|
|
/* flush snaps first time around only */
|
|
if (!list_empty(&ci->i_cap_snaps))
|
|
__ceph_flush_snaps(ci, &session, 0);
|
|
goto retry_locked;
|
|
retry:
|
|
spin_lock(&inode->i_lock);
|
|
retry_locked:
|
|
file_wanted = __ceph_caps_file_wanted(ci);
|
|
used = __ceph_caps_used(ci);
|
|
want = file_wanted | used;
|
|
issued = __ceph_caps_issued(ci, &implemented);
|
|
revoking = implemented & ~issued;
|
|
|
|
retain = want | CEPH_CAP_PIN;
|
|
if (!mdsc->stopping && inode->i_nlink > 0) {
|
|
if (want) {
|
|
retain |= CEPH_CAP_ANY; /* be greedy */
|
|
} else {
|
|
retain |= CEPH_CAP_ANY_SHARED;
|
|
/*
|
|
* keep RD only if we didn't have the file open RW,
|
|
* because then the mds would revoke it anyway to
|
|
* journal max_size=0.
|
|
*/
|
|
if (ci->i_max_size == 0)
|
|
retain |= CEPH_CAP_ANY_RD;
|
|
}
|
|
}
|
|
|
|
dout("check_caps %p file_want %s used %s dirty %s flushing %s"
|
|
" issued %s revoking %s retain %s %s%s%s\n", inode,
|
|
ceph_cap_string(file_wanted),
|
|
ceph_cap_string(used), ceph_cap_string(ci->i_dirty_caps),
|
|
ceph_cap_string(ci->i_flushing_caps),
|
|
ceph_cap_string(issued), ceph_cap_string(revoking),
|
|
ceph_cap_string(retain),
|
|
(flags & CHECK_CAPS_AUTHONLY) ? " AUTHONLY" : "",
|
|
(flags & CHECK_CAPS_NODELAY) ? " NODELAY" : "",
|
|
(flags & CHECK_CAPS_FLUSH) ? " FLUSH" : "");
|
|
|
|
/*
|
|
* If we no longer need to hold onto old our caps, and we may
|
|
* have cached pages, but don't want them, then try to invalidate.
|
|
* If we fail, it's because pages are locked.... try again later.
|
|
*/
|
|
if ((!is_delayed || mdsc->stopping) &&
|
|
ci->i_wrbuffer_ref == 0 && /* no dirty pages... */
|
|
inode->i_data.nrpages && /* have cached pages */
|
|
(file_wanted == 0 || /* no open files */
|
|
(revoking & (CEPH_CAP_FILE_CACHE|
|
|
CEPH_CAP_FILE_LAZYIO))) && /* or revoking cache */
|
|
!tried_invalidate) {
|
|
dout("check_caps trying to invalidate on %p\n", inode);
|
|
if (try_nonblocking_invalidate(inode) < 0) {
|
|
if (revoking & (CEPH_CAP_FILE_CACHE|
|
|
CEPH_CAP_FILE_LAZYIO)) {
|
|
dout("check_caps queuing invalidate\n");
|
|
queue_invalidate = 1;
|
|
ci->i_rdcache_revoking = ci->i_rdcache_gen;
|
|
} else {
|
|
dout("check_caps failed to invalidate pages\n");
|
|
/* we failed to invalidate pages. check these
|
|
caps again later. */
|
|
force_requeue = 1;
|
|
__cap_set_timeouts(mdsc, ci);
|
|
}
|
|
}
|
|
tried_invalidate = 1;
|
|
goto retry_locked;
|
|
}
|
|
|
|
num = 0;
|
|
for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
|
|
cap = rb_entry(p, struct ceph_cap, ci_node);
|
|
num++;
|
|
|
|
/* avoid looping forever */
|
|
if (mds >= cap->mds ||
|
|
((flags & CHECK_CAPS_AUTHONLY) && cap != ci->i_auth_cap))
|
|
continue;
|
|
|
|
/* NOTE: no side-effects allowed, until we take s_mutex */
|
|
|
|
revoking = cap->implemented & ~cap->issued;
|
|
dout(" mds%d cap %p issued %s implemented %s revoking %s\n",
|
|
cap->mds, cap, ceph_cap_string(cap->issued),
|
|
ceph_cap_string(cap->implemented),
|
|
ceph_cap_string(revoking));
|
|
|
|
if (cap == ci->i_auth_cap &&
|
|
(cap->issued & CEPH_CAP_FILE_WR)) {
|
|
/* request larger max_size from MDS? */
|
|
if (ci->i_wanted_max_size > ci->i_max_size &&
|
|
ci->i_wanted_max_size > ci->i_requested_max_size) {
|
|
dout("requesting new max_size\n");
|
|
goto ack;
|
|
}
|
|
|
|
/* approaching file_max? */
|
|
if ((inode->i_size << 1) >= ci->i_max_size &&
|
|
(ci->i_reported_size << 1) < ci->i_max_size) {
|
|
dout("i_size approaching max_size\n");
|
|
goto ack;
|
|
}
|
|
}
|
|
/* flush anything dirty? */
|
|
if (cap == ci->i_auth_cap && (flags & CHECK_CAPS_FLUSH) &&
|
|
ci->i_dirty_caps) {
|
|
dout("flushing dirty caps\n");
|
|
goto ack;
|
|
}
|
|
|
|
/* completed revocation? going down and there are no caps? */
|
|
if (revoking && (revoking & used) == 0) {
|
|
dout("completed revocation of %s\n",
|
|
ceph_cap_string(cap->implemented & ~cap->issued));
|
|
goto ack;
|
|
}
|
|
|
|
/* want more caps from mds? */
|
|
if (want & ~(cap->mds_wanted | cap->issued))
|
|
goto ack;
|
|
|
|
/* things we might delay */
|
|
if ((cap->issued & ~retain) == 0 &&
|
|
cap->mds_wanted == want)
|
|
continue; /* nope, all good */
|
|
|
|
if (is_delayed)
|
|
goto ack;
|
|
|
|
/* delay? */
|
|
if ((ci->i_ceph_flags & CEPH_I_NODELAY) == 0 &&
|
|
time_before(jiffies, ci->i_hold_caps_max)) {
|
|
dout(" delaying issued %s -> %s, wanted %s -> %s\n",
|
|
ceph_cap_string(cap->issued),
|
|
ceph_cap_string(cap->issued & retain),
|
|
ceph_cap_string(cap->mds_wanted),
|
|
ceph_cap_string(want));
|
|
delayed++;
|
|
continue;
|
|
}
|
|
|
|
ack:
|
|
if (ci->i_ceph_flags & CEPH_I_NOFLUSH) {
|
|
dout(" skipping %p I_NOFLUSH set\n", inode);
|
|
continue;
|
|
}
|
|
|
|
if (session && session != cap->session) {
|
|
dout("oops, wrong session %p mutex\n", session);
|
|
mutex_unlock(&session->s_mutex);
|
|
session = NULL;
|
|
}
|
|
if (!session) {
|
|
session = cap->session;
|
|
if (mutex_trylock(&session->s_mutex) == 0) {
|
|
dout("inverting session/ino locks on %p\n",
|
|
session);
|
|
spin_unlock(&inode->i_lock);
|
|
if (took_snap_rwsem) {
|
|
up_read(&mdsc->snap_rwsem);
|
|
took_snap_rwsem = 0;
|
|
}
|
|
mutex_lock(&session->s_mutex);
|
|
goto retry;
|
|
}
|
|
}
|
|
/* take snap_rwsem after session mutex */
|
|
if (!took_snap_rwsem) {
|
|
if (down_read_trylock(&mdsc->snap_rwsem) == 0) {
|
|
dout("inverting snap/in locks on %p\n",
|
|
inode);
|
|
spin_unlock(&inode->i_lock);
|
|
down_read(&mdsc->snap_rwsem);
|
|
took_snap_rwsem = 1;
|
|
goto retry;
|
|
}
|
|
took_snap_rwsem = 1;
|
|
}
|
|
|
|
if (cap == ci->i_auth_cap && ci->i_dirty_caps)
|
|
flushing = __mark_caps_flushing(inode, session);
|
|
else
|
|
flushing = 0;
|
|
|
|
mds = cap->mds; /* remember mds, so we don't repeat */
|
|
sent++;
|
|
|
|
/* __send_cap drops i_lock */
|
|
delayed += __send_cap(mdsc, cap, CEPH_CAP_OP_UPDATE, used, want,
|
|
retain, flushing, NULL);
|
|
goto retry; /* retake i_lock and restart our cap scan. */
|
|
}
|
|
|
|
/*
|
|
* Reschedule delayed caps release if we delayed anything,
|
|
* otherwise cancel.
|
|
*/
|
|
if (delayed && is_delayed)
|
|
force_requeue = 1; /* __send_cap delayed release; requeue */
|
|
if (!delayed && !is_delayed)
|
|
__cap_delay_cancel(mdsc, ci);
|
|
else if (!is_delayed || force_requeue)
|
|
__cap_delay_requeue(mdsc, ci);
|
|
|
|
spin_unlock(&inode->i_lock);
|
|
|
|
if (queue_invalidate)
|
|
ceph_queue_invalidate(inode);
|
|
|
|
if (session)
|
|
mutex_unlock(&session->s_mutex);
|
|
if (took_snap_rwsem)
|
|
up_read(&mdsc->snap_rwsem);
|
|
}
|
|
|
|
/*
|
|
* Try to flush dirty caps back to the auth mds.
|
|
*/
|
|
static int try_flush_caps(struct inode *inode, struct ceph_mds_session *session,
|
|
unsigned *flush_tid)
|
|
{
|
|
struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
|
|
struct ceph_inode_info *ci = ceph_inode(inode);
|
|
int unlock_session = session ? 0 : 1;
|
|
int flushing = 0;
|
|
|
|
retry:
|
|
spin_lock(&inode->i_lock);
|
|
if (ci->i_ceph_flags & CEPH_I_NOFLUSH) {
|
|
dout("try_flush_caps skipping %p I_NOFLUSH set\n", inode);
|
|
goto out;
|
|
}
|
|
if (ci->i_dirty_caps && ci->i_auth_cap) {
|
|
struct ceph_cap *cap = ci->i_auth_cap;
|
|
int used = __ceph_caps_used(ci);
|
|
int want = __ceph_caps_wanted(ci);
|
|
int delayed;
|
|
|
|
if (!session) {
|
|
spin_unlock(&inode->i_lock);
|
|
session = cap->session;
|
|
mutex_lock(&session->s_mutex);
|
|
goto retry;
|
|
}
|
|
BUG_ON(session != cap->session);
|
|
if (cap->session->s_state < CEPH_MDS_SESSION_OPEN)
|
|
goto out;
|
|
|
|
flushing = __mark_caps_flushing(inode, session);
|
|
|
|
/* __send_cap drops i_lock */
|
|
delayed = __send_cap(mdsc, cap, CEPH_CAP_OP_FLUSH, used, want,
|
|
cap->issued | cap->implemented, flushing,
|
|
flush_tid);
|
|
if (!delayed)
|
|
goto out_unlocked;
|
|
|
|
spin_lock(&inode->i_lock);
|
|
__cap_delay_requeue(mdsc, ci);
|
|
}
|
|
out:
|
|
spin_unlock(&inode->i_lock);
|
|
out_unlocked:
|
|
if (session && unlock_session)
|
|
mutex_unlock(&session->s_mutex);
|
|
return flushing;
|
|
}
|
|
|
|
/*
|
|
* Return true if we've flushed caps through the given flush_tid.
|
|
*/
|
|
static int caps_are_flushed(struct inode *inode, unsigned tid)
|
|
{
|
|
struct ceph_inode_info *ci = ceph_inode(inode);
|
|
int i, ret = 1;
|
|
|
|
spin_lock(&inode->i_lock);
|
|
for (i = 0; i < CEPH_CAP_BITS; i++)
|
|
if ((ci->i_flushing_caps & (1 << i)) &&
|
|
ci->i_cap_flush_tid[i] <= tid) {
|
|
/* still flushing this bit */
|
|
ret = 0;
|
|
break;
|
|
}
|
|
spin_unlock(&inode->i_lock);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Wait on any unsafe replies for the given inode. First wait on the
|
|
* newest request, and make that the upper bound. Then, if there are
|
|
* more requests, keep waiting on the oldest as long as it is still older
|
|
* than the original request.
|
|
*/
|
|
static void sync_write_wait(struct inode *inode)
|
|
{
|
|
struct ceph_inode_info *ci = ceph_inode(inode);
|
|
struct list_head *head = &ci->i_unsafe_writes;
|
|
struct ceph_osd_request *req;
|
|
u64 last_tid;
|
|
|
|
spin_lock(&ci->i_unsafe_lock);
|
|
if (list_empty(head))
|
|
goto out;
|
|
|
|
/* set upper bound as _last_ entry in chain */
|
|
req = list_entry(head->prev, struct ceph_osd_request,
|
|
r_unsafe_item);
|
|
last_tid = req->r_tid;
|
|
|
|
do {
|
|
ceph_osdc_get_request(req);
|
|
spin_unlock(&ci->i_unsafe_lock);
|
|
dout("sync_write_wait on tid %llu (until %llu)\n",
|
|
req->r_tid, last_tid);
|
|
wait_for_completion(&req->r_safe_completion);
|
|
spin_lock(&ci->i_unsafe_lock);
|
|
ceph_osdc_put_request(req);
|
|
|
|
/*
|
|
* from here on look at first entry in chain, since we
|
|
* only want to wait for anything older than last_tid
|
|
*/
|
|
if (list_empty(head))
|
|
break;
|
|
req = list_entry(head->next, struct ceph_osd_request,
|
|
r_unsafe_item);
|
|
} while (req->r_tid < last_tid);
|
|
out:
|
|
spin_unlock(&ci->i_unsafe_lock);
|
|
}
|
|
|
|
int ceph_fsync(struct file *file, int datasync)
|
|
{
|
|
struct inode *inode = file->f_mapping->host;
|
|
struct ceph_inode_info *ci = ceph_inode(inode);
|
|
unsigned flush_tid;
|
|
int ret;
|
|
int dirty;
|
|
|
|
dout("fsync %p%s\n", inode, datasync ? " datasync" : "");
|
|
sync_write_wait(inode);
|
|
|
|
ret = filemap_write_and_wait(inode->i_mapping);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
dirty = try_flush_caps(inode, NULL, &flush_tid);
|
|
dout("fsync dirty caps are %s\n", ceph_cap_string(dirty));
|
|
|
|
/*
|
|
* only wait on non-file metadata writeback (the mds
|
|
* can recover size and mtime, so we don't need to
|
|
* wait for that)
|
|
*/
|
|
if (!datasync && (dirty & ~CEPH_CAP_ANY_FILE_WR)) {
|
|
dout("fsync waiting for flush_tid %u\n", flush_tid);
|
|
ret = wait_event_interruptible(ci->i_cap_wq,
|
|
caps_are_flushed(inode, flush_tid));
|
|
}
|
|
|
|
dout("fsync %p%s done\n", inode, datasync ? " datasync" : "");
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Flush any dirty caps back to the mds. If we aren't asked to wait,
|
|
* queue inode for flush but don't do so immediately, because we can
|
|
* get by with fewer MDS messages if we wait for data writeback to
|
|
* complete first.
|
|
*/
|
|
int ceph_write_inode(struct inode *inode, struct writeback_control *wbc)
|
|
{
|
|
struct ceph_inode_info *ci = ceph_inode(inode);
|
|
unsigned flush_tid;
|
|
int err = 0;
|
|
int dirty;
|
|
int wait = wbc->sync_mode == WB_SYNC_ALL;
|
|
|
|
dout("write_inode %p wait=%d\n", inode, wait);
|
|
if (wait) {
|
|
dirty = try_flush_caps(inode, NULL, &flush_tid);
|
|
if (dirty)
|
|
err = wait_event_interruptible(ci->i_cap_wq,
|
|
caps_are_flushed(inode, flush_tid));
|
|
} else {
|
|
struct ceph_mds_client *mdsc =
|
|
ceph_sb_to_client(inode->i_sb)->mdsc;
|
|
|
|
spin_lock(&inode->i_lock);
|
|
if (__ceph_caps_dirty(ci))
|
|
__cap_delay_requeue_front(mdsc, ci);
|
|
spin_unlock(&inode->i_lock);
|
|
}
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* After a recovering MDS goes active, we need to resend any caps
|
|
* we were flushing.
|
|
*
|
|
* Caller holds session->s_mutex.
|
|
*/
|
|
static void kick_flushing_capsnaps(struct ceph_mds_client *mdsc,
|
|
struct ceph_mds_session *session)
|
|
{
|
|
struct ceph_cap_snap *capsnap;
|
|
|
|
dout("kick_flushing_capsnaps mds%d\n", session->s_mds);
|
|
list_for_each_entry(capsnap, &session->s_cap_snaps_flushing,
|
|
flushing_item) {
|
|
struct ceph_inode_info *ci = capsnap->ci;
|
|
struct inode *inode = &ci->vfs_inode;
|
|
struct ceph_cap *cap;
|
|
|
|
spin_lock(&inode->i_lock);
|
|
cap = ci->i_auth_cap;
|
|
if (cap && cap->session == session) {
|
|
dout("kick_flushing_caps %p cap %p capsnap %p\n", inode,
|
|
cap, capsnap);
|
|
__ceph_flush_snaps(ci, &session, 1);
|
|
} else {
|
|
pr_err("%p auth cap %p not mds%d ???\n", inode,
|
|
cap, session->s_mds);
|
|
}
|
|
spin_unlock(&inode->i_lock);
|
|
}
|
|
}
|
|
|
|
void ceph_kick_flushing_caps(struct ceph_mds_client *mdsc,
|
|
struct ceph_mds_session *session)
|
|
{
|
|
struct ceph_inode_info *ci;
|
|
|
|
kick_flushing_capsnaps(mdsc, session);
|
|
|
|
dout("kick_flushing_caps mds%d\n", session->s_mds);
|
|
list_for_each_entry(ci, &session->s_cap_flushing, i_flushing_item) {
|
|
struct inode *inode = &ci->vfs_inode;
|
|
struct ceph_cap *cap;
|
|
int delayed = 0;
|
|
|
|
spin_lock(&inode->i_lock);
|
|
cap = ci->i_auth_cap;
|
|
if (cap && cap->session == session) {
|
|
dout("kick_flushing_caps %p cap %p %s\n", inode,
|
|
cap, ceph_cap_string(ci->i_flushing_caps));
|
|
delayed = __send_cap(mdsc, cap, CEPH_CAP_OP_FLUSH,
|
|
__ceph_caps_used(ci),
|
|
__ceph_caps_wanted(ci),
|
|
cap->issued | cap->implemented,
|
|
ci->i_flushing_caps, NULL);
|
|
if (delayed) {
|
|
spin_lock(&inode->i_lock);
|
|
__cap_delay_requeue(mdsc, ci);
|
|
spin_unlock(&inode->i_lock);
|
|
}
|
|
} else {
|
|
pr_err("%p auth cap %p not mds%d ???\n", inode,
|
|
cap, session->s_mds);
|
|
spin_unlock(&inode->i_lock);
|
|
}
|
|
}
|
|
}
|
|
|
|
static void kick_flushing_inode_caps(struct ceph_mds_client *mdsc,
|
|
struct ceph_mds_session *session,
|
|
struct inode *inode)
|
|
{
|
|
struct ceph_inode_info *ci = ceph_inode(inode);
|
|
struct ceph_cap *cap;
|
|
int delayed = 0;
|
|
|
|
spin_lock(&inode->i_lock);
|
|
cap = ci->i_auth_cap;
|
|
dout("kick_flushing_inode_caps %p flushing %s flush_seq %lld\n", inode,
|
|
ceph_cap_string(ci->i_flushing_caps), ci->i_cap_flush_seq);
|
|
__ceph_flush_snaps(ci, &session, 1);
|
|
if (ci->i_flushing_caps) {
|
|
delayed = __send_cap(mdsc, cap, CEPH_CAP_OP_FLUSH,
|
|
__ceph_caps_used(ci),
|
|
__ceph_caps_wanted(ci),
|
|
cap->issued | cap->implemented,
|
|
ci->i_flushing_caps, NULL);
|
|
if (delayed) {
|
|
spin_lock(&inode->i_lock);
|
|
__cap_delay_requeue(mdsc, ci);
|
|
spin_unlock(&inode->i_lock);
|
|
}
|
|
} else {
|
|
spin_unlock(&inode->i_lock);
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
* Take references to capabilities we hold, so that we don't release
|
|
* them to the MDS prematurely.
|
|
*
|
|
* Protected by i_lock.
|
|
*/
|
|
static void __take_cap_refs(struct ceph_inode_info *ci, int got)
|
|
{
|
|
if (got & CEPH_CAP_PIN)
|
|
ci->i_pin_ref++;
|
|
if (got & CEPH_CAP_FILE_RD)
|
|
ci->i_rd_ref++;
|
|
if (got & CEPH_CAP_FILE_CACHE)
|
|
ci->i_rdcache_ref++;
|
|
if (got & CEPH_CAP_FILE_WR)
|
|
ci->i_wr_ref++;
|
|
if (got & CEPH_CAP_FILE_BUFFER) {
|
|
if (ci->i_wrbuffer_ref == 0)
|
|
igrab(&ci->vfs_inode);
|
|
ci->i_wrbuffer_ref++;
|
|
dout("__take_cap_refs %p wrbuffer %d -> %d (?)\n",
|
|
&ci->vfs_inode, ci->i_wrbuffer_ref-1, ci->i_wrbuffer_ref);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Try to grab cap references. Specify those refs we @want, and the
|
|
* minimal set we @need. Also include the larger offset we are writing
|
|
* to (when applicable), and check against max_size here as well.
|
|
* Note that caller is responsible for ensuring max_size increases are
|
|
* requested from the MDS.
|
|
*/
|
|
static int try_get_cap_refs(struct ceph_inode_info *ci, int need, int want,
|
|
int *got, loff_t endoff, int *check_max, int *err)
|
|
{
|
|
struct inode *inode = &ci->vfs_inode;
|
|
int ret = 0;
|
|
int have, implemented;
|
|
int file_wanted;
|
|
|
|
dout("get_cap_refs %p need %s want %s\n", inode,
|
|
ceph_cap_string(need), ceph_cap_string(want));
|
|
spin_lock(&inode->i_lock);
|
|
|
|
/* make sure file is actually open */
|
|
file_wanted = __ceph_caps_file_wanted(ci);
|
|
if ((file_wanted & need) == 0) {
|
|
dout("try_get_cap_refs need %s file_wanted %s, EBADF\n",
|
|
ceph_cap_string(need), ceph_cap_string(file_wanted));
|
|
*err = -EBADF;
|
|
ret = 1;
|
|
goto out;
|
|
}
|
|
|
|
if (need & CEPH_CAP_FILE_WR) {
|
|
if (endoff >= 0 && endoff > (loff_t)ci->i_max_size) {
|
|
dout("get_cap_refs %p endoff %llu > maxsize %llu\n",
|
|
inode, endoff, ci->i_max_size);
|
|
if (endoff > ci->i_wanted_max_size) {
|
|
*check_max = 1;
|
|
ret = 1;
|
|
}
|
|
goto out;
|
|
}
|
|
/*
|
|
* If a sync write is in progress, we must wait, so that we
|
|
* can get a final snapshot value for size+mtime.
|
|
*/
|
|
if (__ceph_have_pending_cap_snap(ci)) {
|
|
dout("get_cap_refs %p cap_snap_pending\n", inode);
|
|
goto out;
|
|
}
|
|
}
|
|
have = __ceph_caps_issued(ci, &implemented);
|
|
|
|
/*
|
|
* disallow writes while a truncate is pending
|
|
*/
|
|
if (ci->i_truncate_pending)
|
|
have &= ~CEPH_CAP_FILE_WR;
|
|
|
|
if ((have & need) == need) {
|
|
/*
|
|
* Look at (implemented & ~have & not) so that we keep waiting
|
|
* on transition from wanted -> needed caps. This is needed
|
|
* for WRBUFFER|WR -> WR to avoid a new WR sync write from
|
|
* going before a prior buffered writeback happens.
|
|
*/
|
|
int not = want & ~(have & need);
|
|
int revoking = implemented & ~have;
|
|
dout("get_cap_refs %p have %s but not %s (revoking %s)\n",
|
|
inode, ceph_cap_string(have), ceph_cap_string(not),
|
|
ceph_cap_string(revoking));
|
|
if ((revoking & not) == 0) {
|
|
*got = need | (have & want);
|
|
__take_cap_refs(ci, *got);
|
|
ret = 1;
|
|
}
|
|
} else {
|
|
dout("get_cap_refs %p have %s needed %s\n", inode,
|
|
ceph_cap_string(have), ceph_cap_string(need));
|
|
}
|
|
out:
|
|
spin_unlock(&inode->i_lock);
|
|
dout("get_cap_refs %p ret %d got %s\n", inode,
|
|
ret, ceph_cap_string(*got));
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Check the offset we are writing up to against our current
|
|
* max_size. If necessary, tell the MDS we want to write to
|
|
* a larger offset.
|
|
*/
|
|
static void check_max_size(struct inode *inode, loff_t endoff)
|
|
{
|
|
struct ceph_inode_info *ci = ceph_inode(inode);
|
|
int check = 0;
|
|
|
|
/* do we need to explicitly request a larger max_size? */
|
|
spin_lock(&inode->i_lock);
|
|
if ((endoff >= ci->i_max_size ||
|
|
endoff > (inode->i_size << 1)) &&
|
|
endoff > ci->i_wanted_max_size) {
|
|
dout("write %p at large endoff %llu, req max_size\n",
|
|
inode, endoff);
|
|
ci->i_wanted_max_size = endoff;
|
|
check = 1;
|
|
}
|
|
spin_unlock(&inode->i_lock);
|
|
if (check)
|
|
ceph_check_caps(ci, CHECK_CAPS_AUTHONLY, NULL);
|
|
}
|
|
|
|
/*
|
|
* Wait for caps, and take cap references. If we can't get a WR cap
|
|
* due to a small max_size, make sure we check_max_size (and possibly
|
|
* ask the mds) so we don't get hung up indefinitely.
|
|
*/
|
|
int ceph_get_caps(struct ceph_inode_info *ci, int need, int want, int *got,
|
|
loff_t endoff)
|
|
{
|
|
int check_max, ret, err;
|
|
|
|
retry:
|
|
if (endoff > 0)
|
|
check_max_size(&ci->vfs_inode, endoff);
|
|
check_max = 0;
|
|
err = 0;
|
|
ret = wait_event_interruptible(ci->i_cap_wq,
|
|
try_get_cap_refs(ci, need, want,
|
|
got, endoff,
|
|
&check_max, &err));
|
|
if (err)
|
|
ret = err;
|
|
if (check_max)
|
|
goto retry;
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Take cap refs. Caller must already know we hold at least one ref
|
|
* on the caps in question or we don't know this is safe.
|
|
*/
|
|
void ceph_get_cap_refs(struct ceph_inode_info *ci, int caps)
|
|
{
|
|
spin_lock(&ci->vfs_inode.i_lock);
|
|
__take_cap_refs(ci, caps);
|
|
spin_unlock(&ci->vfs_inode.i_lock);
|
|
}
|
|
|
|
/*
|
|
* Release cap refs.
|
|
*
|
|
* If we released the last ref on any given cap, call ceph_check_caps
|
|
* to release (or schedule a release).
|
|
*
|
|
* If we are releasing a WR cap (from a sync write), finalize any affected
|
|
* cap_snap, and wake up any waiters.
|
|
*/
|
|
void ceph_put_cap_refs(struct ceph_inode_info *ci, int had)
|
|
{
|
|
struct inode *inode = &ci->vfs_inode;
|
|
int last = 0, put = 0, flushsnaps = 0, wake = 0;
|
|
struct ceph_cap_snap *capsnap;
|
|
|
|
spin_lock(&inode->i_lock);
|
|
if (had & CEPH_CAP_PIN)
|
|
--ci->i_pin_ref;
|
|
if (had & CEPH_CAP_FILE_RD)
|
|
if (--ci->i_rd_ref == 0)
|
|
last++;
|
|
if (had & CEPH_CAP_FILE_CACHE)
|
|
if (--ci->i_rdcache_ref == 0)
|
|
last++;
|
|
if (had & CEPH_CAP_FILE_BUFFER) {
|
|
if (--ci->i_wrbuffer_ref == 0) {
|
|
last++;
|
|
put++;
|
|
}
|
|
dout("put_cap_refs %p wrbuffer %d -> %d (?)\n",
|
|
inode, ci->i_wrbuffer_ref+1, ci->i_wrbuffer_ref);
|
|
}
|
|
if (had & CEPH_CAP_FILE_WR)
|
|
if (--ci->i_wr_ref == 0) {
|
|
last++;
|
|
if (!list_empty(&ci->i_cap_snaps)) {
|
|
capsnap = list_first_entry(&ci->i_cap_snaps,
|
|
struct ceph_cap_snap,
|
|
ci_item);
|
|
if (capsnap->writing) {
|
|
capsnap->writing = 0;
|
|
flushsnaps =
|
|
__ceph_finish_cap_snap(ci,
|
|
capsnap);
|
|
wake = 1;
|
|
}
|
|
}
|
|
}
|
|
spin_unlock(&inode->i_lock);
|
|
|
|
dout("put_cap_refs %p had %s%s%s\n", inode, ceph_cap_string(had),
|
|
last ? " last" : "", put ? " put" : "");
|
|
|
|
if (last && !flushsnaps)
|
|
ceph_check_caps(ci, 0, NULL);
|
|
else if (flushsnaps)
|
|
ceph_flush_snaps(ci);
|
|
if (wake)
|
|
wake_up_all(&ci->i_cap_wq);
|
|
if (put)
|
|
iput(inode);
|
|
}
|
|
|
|
/*
|
|
* Release @nr WRBUFFER refs on dirty pages for the given @snapc snap
|
|
* context. Adjust per-snap dirty page accounting as appropriate.
|
|
* Once all dirty data for a cap_snap is flushed, flush snapped file
|
|
* metadata back to the MDS. If we dropped the last ref, call
|
|
* ceph_check_caps.
|
|
*/
|
|
void ceph_put_wrbuffer_cap_refs(struct ceph_inode_info *ci, int nr,
|
|
struct ceph_snap_context *snapc)
|
|
{
|
|
struct inode *inode = &ci->vfs_inode;
|
|
int last = 0;
|
|
int complete_capsnap = 0;
|
|
int drop_capsnap = 0;
|
|
int found = 0;
|
|
struct ceph_cap_snap *capsnap = NULL;
|
|
|
|
spin_lock(&inode->i_lock);
|
|
ci->i_wrbuffer_ref -= nr;
|
|
last = !ci->i_wrbuffer_ref;
|
|
|
|
if (ci->i_head_snapc == snapc) {
|
|
ci->i_wrbuffer_ref_head -= nr;
|
|
if (ci->i_wrbuffer_ref_head == 0 &&
|
|
ci->i_dirty_caps == 0 && ci->i_flushing_caps == 0) {
|
|
BUG_ON(!ci->i_head_snapc);
|
|
ceph_put_snap_context(ci->i_head_snapc);
|
|
ci->i_head_snapc = NULL;
|
|
}
|
|
dout("put_wrbuffer_cap_refs on %p head %d/%d -> %d/%d %s\n",
|
|
inode,
|
|
ci->i_wrbuffer_ref+nr, ci->i_wrbuffer_ref_head+nr,
|
|
ci->i_wrbuffer_ref, ci->i_wrbuffer_ref_head,
|
|
last ? " LAST" : "");
|
|
} else {
|
|
list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) {
|
|
if (capsnap->context == snapc) {
|
|
found = 1;
|
|
break;
|
|
}
|
|
}
|
|
BUG_ON(!found);
|
|
capsnap->dirty_pages -= nr;
|
|
if (capsnap->dirty_pages == 0) {
|
|
complete_capsnap = 1;
|
|
if (capsnap->dirty == 0)
|
|
/* cap writeback completed before we created
|
|
* the cap_snap; no FLUSHSNAP is needed */
|
|
drop_capsnap = 1;
|
|
}
|
|
dout("put_wrbuffer_cap_refs on %p cap_snap %p "
|
|
" snap %lld %d/%d -> %d/%d %s%s%s\n",
|
|
inode, capsnap, capsnap->context->seq,
|
|
ci->i_wrbuffer_ref+nr, capsnap->dirty_pages + nr,
|
|
ci->i_wrbuffer_ref, capsnap->dirty_pages,
|
|
last ? " (wrbuffer last)" : "",
|
|
complete_capsnap ? " (complete capsnap)" : "",
|
|
drop_capsnap ? " (drop capsnap)" : "");
|
|
if (drop_capsnap) {
|
|
ceph_put_snap_context(capsnap->context);
|
|
list_del(&capsnap->ci_item);
|
|
list_del(&capsnap->flushing_item);
|
|
ceph_put_cap_snap(capsnap);
|
|
}
|
|
}
|
|
|
|
spin_unlock(&inode->i_lock);
|
|
|
|
if (last) {
|
|
ceph_check_caps(ci, CHECK_CAPS_AUTHONLY, NULL);
|
|
iput(inode);
|
|
} else if (complete_capsnap) {
|
|
ceph_flush_snaps(ci);
|
|
wake_up_all(&ci->i_cap_wq);
|
|
}
|
|
if (drop_capsnap)
|
|
iput(inode);
|
|
}
|
|
|
|
/*
|
|
* Handle a cap GRANT message from the MDS. (Note that a GRANT may
|
|
* actually be a revocation if it specifies a smaller cap set.)
|
|
*
|
|
* caller holds s_mutex and i_lock, we drop both.
|
|
*
|
|
* return value:
|
|
* 0 - ok
|
|
* 1 - check_caps on auth cap only (writeback)
|
|
* 2 - check_caps (ack revoke)
|
|
*/
|
|
static void handle_cap_grant(struct inode *inode, struct ceph_mds_caps *grant,
|
|
struct ceph_mds_session *session,
|
|
struct ceph_cap *cap,
|
|
struct ceph_buffer *xattr_buf)
|
|
__releases(inode->i_lock)
|
|
{
|
|
struct ceph_inode_info *ci = ceph_inode(inode);
|
|
int mds = session->s_mds;
|
|
int seq = le32_to_cpu(grant->seq);
|
|
int newcaps = le32_to_cpu(grant->caps);
|
|
int issued, implemented, used, wanted, dirty;
|
|
u64 size = le64_to_cpu(grant->size);
|
|
u64 max_size = le64_to_cpu(grant->max_size);
|
|
struct timespec mtime, atime, ctime;
|
|
int check_caps = 0;
|
|
int wake = 0;
|
|
int writeback = 0;
|
|
int revoked_rdcache = 0;
|
|
int queue_invalidate = 0;
|
|
|
|
dout("handle_cap_grant inode %p cap %p mds%d seq %d %s\n",
|
|
inode, cap, mds, seq, ceph_cap_string(newcaps));
|
|
dout(" size %llu max_size %llu, i_size %llu\n", size, max_size,
|
|
inode->i_size);
|
|
|
|
/*
|
|
* If CACHE is being revoked, and we have no dirty buffers,
|
|
* try to invalidate (once). (If there are dirty buffers, we
|
|
* will invalidate _after_ writeback.)
|
|
*/
|
|
if (((cap->issued & ~newcaps) & CEPH_CAP_FILE_CACHE) &&
|
|
(newcaps & CEPH_CAP_FILE_LAZYIO) == 0 &&
|
|
!ci->i_wrbuffer_ref) {
|
|
if (try_nonblocking_invalidate(inode) == 0) {
|
|
revoked_rdcache = 1;
|
|
} else {
|
|
/* there were locked pages.. invalidate later
|
|
in a separate thread. */
|
|
if (ci->i_rdcache_revoking != ci->i_rdcache_gen) {
|
|
queue_invalidate = 1;
|
|
ci->i_rdcache_revoking = ci->i_rdcache_gen;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* side effects now are allowed */
|
|
|
|
issued = __ceph_caps_issued(ci, &implemented);
|
|
issued |= implemented | __ceph_caps_dirty(ci);
|
|
|
|
cap->cap_gen = session->s_cap_gen;
|
|
|
|
__check_cap_issue(ci, cap, newcaps);
|
|
|
|
if ((issued & CEPH_CAP_AUTH_EXCL) == 0) {
|
|
inode->i_mode = le32_to_cpu(grant->mode);
|
|
inode->i_uid = le32_to_cpu(grant->uid);
|
|
inode->i_gid = le32_to_cpu(grant->gid);
|
|
dout("%p mode 0%o uid.gid %d.%d\n", inode, inode->i_mode,
|
|
inode->i_uid, inode->i_gid);
|
|
}
|
|
|
|
if ((issued & CEPH_CAP_LINK_EXCL) == 0)
|
|
inode->i_nlink = le32_to_cpu(grant->nlink);
|
|
|
|
if ((issued & CEPH_CAP_XATTR_EXCL) == 0 && grant->xattr_len) {
|
|
int len = le32_to_cpu(grant->xattr_len);
|
|
u64 version = le64_to_cpu(grant->xattr_version);
|
|
|
|
if (version > ci->i_xattrs.version) {
|
|
dout(" got new xattrs v%llu on %p len %d\n",
|
|
version, inode, len);
|
|
if (ci->i_xattrs.blob)
|
|
ceph_buffer_put(ci->i_xattrs.blob);
|
|
ci->i_xattrs.blob = ceph_buffer_get(xattr_buf);
|
|
ci->i_xattrs.version = version;
|
|
}
|
|
}
|
|
|
|
/* size/ctime/mtime/atime? */
|
|
ceph_fill_file_size(inode, issued,
|
|
le32_to_cpu(grant->truncate_seq),
|
|
le64_to_cpu(grant->truncate_size), size);
|
|
ceph_decode_timespec(&mtime, &grant->mtime);
|
|
ceph_decode_timespec(&atime, &grant->atime);
|
|
ceph_decode_timespec(&ctime, &grant->ctime);
|
|
ceph_fill_file_time(inode, issued,
|
|
le32_to_cpu(grant->time_warp_seq), &ctime, &mtime,
|
|
&atime);
|
|
|
|
/* max size increase? */
|
|
if (max_size != ci->i_max_size) {
|
|
dout("max_size %lld -> %llu\n", ci->i_max_size, max_size);
|
|
ci->i_max_size = max_size;
|
|
if (max_size >= ci->i_wanted_max_size) {
|
|
ci->i_wanted_max_size = 0; /* reset */
|
|
ci->i_requested_max_size = 0;
|
|
}
|
|
wake = 1;
|
|
}
|
|
|
|
/* check cap bits */
|
|
wanted = __ceph_caps_wanted(ci);
|
|
used = __ceph_caps_used(ci);
|
|
dirty = __ceph_caps_dirty(ci);
|
|
dout(" my wanted = %s, used = %s, dirty %s\n",
|
|
ceph_cap_string(wanted),
|
|
ceph_cap_string(used),
|
|
ceph_cap_string(dirty));
|
|
if (wanted != le32_to_cpu(grant->wanted)) {
|
|
dout("mds wanted %s -> %s\n",
|
|
ceph_cap_string(le32_to_cpu(grant->wanted)),
|
|
ceph_cap_string(wanted));
|
|
grant->wanted = cpu_to_le32(wanted);
|
|
}
|
|
|
|
cap->seq = seq;
|
|
|
|
/* file layout may have changed */
|
|
ci->i_layout = grant->layout;
|
|
|
|
/* revocation, grant, or no-op? */
|
|
if (cap->issued & ~newcaps) {
|
|
int revoking = cap->issued & ~newcaps;
|
|
|
|
dout("revocation: %s -> %s (revoking %s)\n",
|
|
ceph_cap_string(cap->issued),
|
|
ceph_cap_string(newcaps),
|
|
ceph_cap_string(revoking));
|
|
if (revoking & used & CEPH_CAP_FILE_BUFFER)
|
|
writeback = 1; /* initiate writeback; will delay ack */
|
|
else if (revoking == CEPH_CAP_FILE_CACHE &&
|
|
(newcaps & CEPH_CAP_FILE_LAZYIO) == 0 &&
|
|
queue_invalidate)
|
|
; /* do nothing yet, invalidation will be queued */
|
|
else if (cap == ci->i_auth_cap)
|
|
check_caps = 1; /* check auth cap only */
|
|
else
|
|
check_caps = 2; /* check all caps */
|
|
cap->issued = newcaps;
|
|
cap->implemented |= newcaps;
|
|
} else if (cap->issued == newcaps) {
|
|
dout("caps unchanged: %s -> %s\n",
|
|
ceph_cap_string(cap->issued), ceph_cap_string(newcaps));
|
|
} else {
|
|
dout("grant: %s -> %s\n", ceph_cap_string(cap->issued),
|
|
ceph_cap_string(newcaps));
|
|
cap->issued = newcaps;
|
|
cap->implemented |= newcaps; /* add bits only, to
|
|
* avoid stepping on a
|
|
* pending revocation */
|
|
wake = 1;
|
|
}
|
|
BUG_ON(cap->issued & ~cap->implemented);
|
|
|
|
spin_unlock(&inode->i_lock);
|
|
if (writeback)
|
|
/*
|
|
* queue inode for writeback: we can't actually call
|
|
* filemap_write_and_wait, etc. from message handler
|
|
* context.
|
|
*/
|
|
ceph_queue_writeback(inode);
|
|
if (queue_invalidate)
|
|
ceph_queue_invalidate(inode);
|
|
if (wake)
|
|
wake_up_all(&ci->i_cap_wq);
|
|
|
|
if (check_caps == 1)
|
|
ceph_check_caps(ci, CHECK_CAPS_NODELAY|CHECK_CAPS_AUTHONLY,
|
|
session);
|
|
else if (check_caps == 2)
|
|
ceph_check_caps(ci, CHECK_CAPS_NODELAY, session);
|
|
else
|
|
mutex_unlock(&session->s_mutex);
|
|
}
|
|
|
|
/*
|
|
* Handle FLUSH_ACK from MDS, indicating that metadata we sent to the
|
|
* MDS has been safely committed.
|
|
*/
|
|
static void handle_cap_flush_ack(struct inode *inode, u64 flush_tid,
|
|
struct ceph_mds_caps *m,
|
|
struct ceph_mds_session *session,
|
|
struct ceph_cap *cap)
|
|
__releases(inode->i_lock)
|
|
{
|
|
struct ceph_inode_info *ci = ceph_inode(inode);
|
|
struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
|
|
unsigned seq = le32_to_cpu(m->seq);
|
|
int dirty = le32_to_cpu(m->dirty);
|
|
int cleaned = 0;
|
|
int drop = 0;
|
|
int i;
|
|
|
|
for (i = 0; i < CEPH_CAP_BITS; i++)
|
|
if ((dirty & (1 << i)) &&
|
|
flush_tid == ci->i_cap_flush_tid[i])
|
|
cleaned |= 1 << i;
|
|
|
|
dout("handle_cap_flush_ack inode %p mds%d seq %d on %s cleaned %s,"
|
|
" flushing %s -> %s\n",
|
|
inode, session->s_mds, seq, ceph_cap_string(dirty),
|
|
ceph_cap_string(cleaned), ceph_cap_string(ci->i_flushing_caps),
|
|
ceph_cap_string(ci->i_flushing_caps & ~cleaned));
|
|
|
|
if (ci->i_flushing_caps == (ci->i_flushing_caps & ~cleaned))
|
|
goto out;
|
|
|
|
ci->i_flushing_caps &= ~cleaned;
|
|
|
|
spin_lock(&mdsc->cap_dirty_lock);
|
|
if (ci->i_flushing_caps == 0) {
|
|
list_del_init(&ci->i_flushing_item);
|
|
if (!list_empty(&session->s_cap_flushing))
|
|
dout(" mds%d still flushing cap on %p\n",
|
|
session->s_mds,
|
|
&list_entry(session->s_cap_flushing.next,
|
|
struct ceph_inode_info,
|
|
i_flushing_item)->vfs_inode);
|
|
mdsc->num_cap_flushing--;
|
|
wake_up_all(&mdsc->cap_flushing_wq);
|
|
dout(" inode %p now !flushing\n", inode);
|
|
|
|
if (ci->i_dirty_caps == 0) {
|
|
dout(" inode %p now clean\n", inode);
|
|
BUG_ON(!list_empty(&ci->i_dirty_item));
|
|
drop = 1;
|
|
if (ci->i_wrbuffer_ref_head == 0) {
|
|
BUG_ON(!ci->i_head_snapc);
|
|
ceph_put_snap_context(ci->i_head_snapc);
|
|
ci->i_head_snapc = NULL;
|
|
}
|
|
} else {
|
|
BUG_ON(list_empty(&ci->i_dirty_item));
|
|
}
|
|
}
|
|
spin_unlock(&mdsc->cap_dirty_lock);
|
|
wake_up_all(&ci->i_cap_wq);
|
|
|
|
out:
|
|
spin_unlock(&inode->i_lock);
|
|
if (drop)
|
|
iput(inode);
|
|
}
|
|
|
|
/*
|
|
* Handle FLUSHSNAP_ACK. MDS has flushed snap data to disk and we can
|
|
* throw away our cap_snap.
|
|
*
|
|
* Caller hold s_mutex.
|
|
*/
|
|
static void handle_cap_flushsnap_ack(struct inode *inode, u64 flush_tid,
|
|
struct ceph_mds_caps *m,
|
|
struct ceph_mds_session *session)
|
|
{
|
|
struct ceph_inode_info *ci = ceph_inode(inode);
|
|
u64 follows = le64_to_cpu(m->snap_follows);
|
|
struct ceph_cap_snap *capsnap;
|
|
int drop = 0;
|
|
|
|
dout("handle_cap_flushsnap_ack inode %p ci %p mds%d follows %lld\n",
|
|
inode, ci, session->s_mds, follows);
|
|
|
|
spin_lock(&inode->i_lock);
|
|
list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) {
|
|
if (capsnap->follows == follows) {
|
|
if (capsnap->flush_tid != flush_tid) {
|
|
dout(" cap_snap %p follows %lld tid %lld !="
|
|
" %lld\n", capsnap, follows,
|
|
flush_tid, capsnap->flush_tid);
|
|
break;
|
|
}
|
|
WARN_ON(capsnap->dirty_pages || capsnap->writing);
|
|
dout(" removing %p cap_snap %p follows %lld\n",
|
|
inode, capsnap, follows);
|
|
ceph_put_snap_context(capsnap->context);
|
|
list_del(&capsnap->ci_item);
|
|
list_del(&capsnap->flushing_item);
|
|
ceph_put_cap_snap(capsnap);
|
|
drop = 1;
|
|
break;
|
|
} else {
|
|
dout(" skipping cap_snap %p follows %lld\n",
|
|
capsnap, capsnap->follows);
|
|
}
|
|
}
|
|
spin_unlock(&inode->i_lock);
|
|
if (drop)
|
|
iput(inode);
|
|
}
|
|
|
|
/*
|
|
* Handle TRUNC from MDS, indicating file truncation.
|
|
*
|
|
* caller hold s_mutex.
|
|
*/
|
|
static void handle_cap_trunc(struct inode *inode,
|
|
struct ceph_mds_caps *trunc,
|
|
struct ceph_mds_session *session)
|
|
__releases(inode->i_lock)
|
|
{
|
|
struct ceph_inode_info *ci = ceph_inode(inode);
|
|
int mds = session->s_mds;
|
|
int seq = le32_to_cpu(trunc->seq);
|
|
u32 truncate_seq = le32_to_cpu(trunc->truncate_seq);
|
|
u64 truncate_size = le64_to_cpu(trunc->truncate_size);
|
|
u64 size = le64_to_cpu(trunc->size);
|
|
int implemented = 0;
|
|
int dirty = __ceph_caps_dirty(ci);
|
|
int issued = __ceph_caps_issued(ceph_inode(inode), &implemented);
|
|
int queue_trunc = 0;
|
|
|
|
issued |= implemented | dirty;
|
|
|
|
dout("handle_cap_trunc inode %p mds%d seq %d to %lld seq %d\n",
|
|
inode, mds, seq, truncate_size, truncate_seq);
|
|
queue_trunc = ceph_fill_file_size(inode, issued,
|
|
truncate_seq, truncate_size, size);
|
|
spin_unlock(&inode->i_lock);
|
|
|
|
if (queue_trunc)
|
|
ceph_queue_vmtruncate(inode);
|
|
}
|
|
|
|
/*
|
|
* Handle EXPORT from MDS. Cap is being migrated _from_ this mds to a
|
|
* different one. If we are the most recent migration we've seen (as
|
|
* indicated by mseq), make note of the migrating cap bits for the
|
|
* duration (until we see the corresponding IMPORT).
|
|
*
|
|
* caller holds s_mutex
|
|
*/
|
|
static void handle_cap_export(struct inode *inode, struct ceph_mds_caps *ex,
|
|
struct ceph_mds_session *session,
|
|
int *open_target_sessions)
|
|
{
|
|
struct ceph_inode_info *ci = ceph_inode(inode);
|
|
int mds = session->s_mds;
|
|
unsigned mseq = le32_to_cpu(ex->migrate_seq);
|
|
struct ceph_cap *cap = NULL, *t;
|
|
struct rb_node *p;
|
|
int remember = 1;
|
|
|
|
dout("handle_cap_export inode %p ci %p mds%d mseq %d\n",
|
|
inode, ci, mds, mseq);
|
|
|
|
spin_lock(&inode->i_lock);
|
|
|
|
/* make sure we haven't seen a higher mseq */
|
|
for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) {
|
|
t = rb_entry(p, struct ceph_cap, ci_node);
|
|
if (ceph_seq_cmp(t->mseq, mseq) > 0) {
|
|
dout(" higher mseq on cap from mds%d\n",
|
|
t->session->s_mds);
|
|
remember = 0;
|
|
}
|
|
if (t->session->s_mds == mds)
|
|
cap = t;
|
|
}
|
|
|
|
if (cap) {
|
|
if (remember) {
|
|
/* make note */
|
|
ci->i_cap_exporting_mds = mds;
|
|
ci->i_cap_exporting_mseq = mseq;
|
|
ci->i_cap_exporting_issued = cap->issued;
|
|
|
|
/*
|
|
* make sure we have open sessions with all possible
|
|
* export targets, so that we get the matching IMPORT
|
|
*/
|
|
*open_target_sessions = 1;
|
|
}
|
|
__ceph_remove_cap(cap);
|
|
}
|
|
/* else, we already released it */
|
|
|
|
spin_unlock(&inode->i_lock);
|
|
}
|
|
|
|
/*
|
|
* Handle cap IMPORT. If there are temp bits from an older EXPORT,
|
|
* clean them up.
|
|
*
|
|
* caller holds s_mutex.
|
|
*/
|
|
static void handle_cap_import(struct ceph_mds_client *mdsc,
|
|
struct inode *inode, struct ceph_mds_caps *im,
|
|
struct ceph_mds_session *session,
|
|
void *snaptrace, int snaptrace_len)
|
|
{
|
|
struct ceph_inode_info *ci = ceph_inode(inode);
|
|
int mds = session->s_mds;
|
|
unsigned issued = le32_to_cpu(im->caps);
|
|
unsigned wanted = le32_to_cpu(im->wanted);
|
|
unsigned seq = le32_to_cpu(im->seq);
|
|
unsigned mseq = le32_to_cpu(im->migrate_seq);
|
|
u64 realmino = le64_to_cpu(im->realm);
|
|
u64 cap_id = le64_to_cpu(im->cap_id);
|
|
|
|
if (ci->i_cap_exporting_mds >= 0 &&
|
|
ceph_seq_cmp(ci->i_cap_exporting_mseq, mseq) < 0) {
|
|
dout("handle_cap_import inode %p ci %p mds%d mseq %d"
|
|
" - cleared exporting from mds%d\n",
|
|
inode, ci, mds, mseq,
|
|
ci->i_cap_exporting_mds);
|
|
ci->i_cap_exporting_issued = 0;
|
|
ci->i_cap_exporting_mseq = 0;
|
|
ci->i_cap_exporting_mds = -1;
|
|
} else {
|
|
dout("handle_cap_import inode %p ci %p mds%d mseq %d\n",
|
|
inode, ci, mds, mseq);
|
|
}
|
|
|
|
down_write(&mdsc->snap_rwsem);
|
|
ceph_update_snap_trace(mdsc, snaptrace, snaptrace+snaptrace_len,
|
|
false);
|
|
downgrade_write(&mdsc->snap_rwsem);
|
|
ceph_add_cap(inode, session, cap_id, -1,
|
|
issued, wanted, seq, mseq, realmino, CEPH_CAP_FLAG_AUTH,
|
|
NULL /* no caps context */);
|
|
kick_flushing_inode_caps(mdsc, session, inode);
|
|
up_read(&mdsc->snap_rwsem);
|
|
|
|
/* make sure we re-request max_size, if necessary */
|
|
spin_lock(&inode->i_lock);
|
|
ci->i_requested_max_size = 0;
|
|
spin_unlock(&inode->i_lock);
|
|
}
|
|
|
|
/*
|
|
* Handle a caps message from the MDS.
|
|
*
|
|
* Identify the appropriate session, inode, and call the right handler
|
|
* based on the cap op.
|
|
*/
|
|
void ceph_handle_caps(struct ceph_mds_session *session,
|
|
struct ceph_msg *msg)
|
|
{
|
|
struct ceph_mds_client *mdsc = session->s_mdsc;
|
|
struct super_block *sb = mdsc->fsc->sb;
|
|
struct inode *inode;
|
|
struct ceph_cap *cap;
|
|
struct ceph_mds_caps *h;
|
|
int mds = session->s_mds;
|
|
int op;
|
|
u32 seq, mseq;
|
|
struct ceph_vino vino;
|
|
u64 cap_id;
|
|
u64 size, max_size;
|
|
u64 tid;
|
|
void *snaptrace;
|
|
size_t snaptrace_len;
|
|
void *flock;
|
|
u32 flock_len;
|
|
int open_target_sessions = 0;
|
|
|
|
dout("handle_caps from mds%d\n", mds);
|
|
|
|
/* decode */
|
|
tid = le64_to_cpu(msg->hdr.tid);
|
|
if (msg->front.iov_len < sizeof(*h))
|
|
goto bad;
|
|
h = msg->front.iov_base;
|
|
op = le32_to_cpu(h->op);
|
|
vino.ino = le64_to_cpu(h->ino);
|
|
vino.snap = CEPH_NOSNAP;
|
|
cap_id = le64_to_cpu(h->cap_id);
|
|
seq = le32_to_cpu(h->seq);
|
|
mseq = le32_to_cpu(h->migrate_seq);
|
|
size = le64_to_cpu(h->size);
|
|
max_size = le64_to_cpu(h->max_size);
|
|
|
|
snaptrace = h + 1;
|
|
snaptrace_len = le32_to_cpu(h->snap_trace_len);
|
|
|
|
if (le16_to_cpu(msg->hdr.version) >= 2) {
|
|
void *p, *end;
|
|
|
|
p = snaptrace + snaptrace_len;
|
|
end = msg->front.iov_base + msg->front.iov_len;
|
|
ceph_decode_32_safe(&p, end, flock_len, bad);
|
|
flock = p;
|
|
} else {
|
|
flock = NULL;
|
|
flock_len = 0;
|
|
}
|
|
|
|
mutex_lock(&session->s_mutex);
|
|
session->s_seq++;
|
|
dout(" mds%d seq %lld cap seq %u\n", session->s_mds, session->s_seq,
|
|
(unsigned)seq);
|
|
|
|
/* lookup ino */
|
|
inode = ceph_find_inode(sb, vino);
|
|
dout(" op %s ino %llx.%llx inode %p\n", ceph_cap_op_name(op), vino.ino,
|
|
vino.snap, inode);
|
|
if (!inode) {
|
|
dout(" i don't have ino %llx\n", vino.ino);
|
|
|
|
if (op == CEPH_CAP_OP_IMPORT)
|
|
__queue_cap_release(session, vino.ino, cap_id,
|
|
mseq, seq);
|
|
goto flush_cap_releases;
|
|
}
|
|
|
|
/* these will work even if we don't have a cap yet */
|
|
switch (op) {
|
|
case CEPH_CAP_OP_FLUSHSNAP_ACK:
|
|
handle_cap_flushsnap_ack(inode, tid, h, session);
|
|
goto done;
|
|
|
|
case CEPH_CAP_OP_EXPORT:
|
|
handle_cap_export(inode, h, session, &open_target_sessions);
|
|
goto done;
|
|
|
|
case CEPH_CAP_OP_IMPORT:
|
|
handle_cap_import(mdsc, inode, h, session,
|
|
snaptrace, snaptrace_len);
|
|
ceph_check_caps(ceph_inode(inode), 0, session);
|
|
goto done_unlocked;
|
|
}
|
|
|
|
/* the rest require a cap */
|
|
spin_lock(&inode->i_lock);
|
|
cap = __get_cap_for_mds(ceph_inode(inode), mds);
|
|
if (!cap) {
|
|
dout(" no cap on %p ino %llx.%llx from mds%d\n",
|
|
inode, ceph_ino(inode), ceph_snap(inode), mds);
|
|
spin_unlock(&inode->i_lock);
|
|
goto flush_cap_releases;
|
|
}
|
|
|
|
/* note that each of these drops i_lock for us */
|
|
switch (op) {
|
|
case CEPH_CAP_OP_REVOKE:
|
|
case CEPH_CAP_OP_GRANT:
|
|
handle_cap_grant(inode, h, session, cap, msg->middle);
|
|
goto done_unlocked;
|
|
|
|
case CEPH_CAP_OP_FLUSH_ACK:
|
|
handle_cap_flush_ack(inode, tid, h, session, cap);
|
|
break;
|
|
|
|
case CEPH_CAP_OP_TRUNC:
|
|
handle_cap_trunc(inode, h, session);
|
|
break;
|
|
|
|
default:
|
|
spin_unlock(&inode->i_lock);
|
|
pr_err("ceph_handle_caps: unknown cap op %d %s\n", op,
|
|
ceph_cap_op_name(op));
|
|
}
|
|
|
|
goto done;
|
|
|
|
flush_cap_releases:
|
|
/*
|
|
* send any full release message to try to move things
|
|
* along for the mds (who clearly thinks we still have this
|
|
* cap).
|
|
*/
|
|
ceph_add_cap_releases(mdsc, session);
|
|
ceph_send_cap_releases(mdsc, session);
|
|
|
|
done:
|
|
mutex_unlock(&session->s_mutex);
|
|
done_unlocked:
|
|
if (inode)
|
|
iput(inode);
|
|
if (open_target_sessions)
|
|
ceph_mdsc_open_export_target_sessions(mdsc, session);
|
|
return;
|
|
|
|
bad:
|
|
pr_err("ceph_handle_caps: corrupt message\n");
|
|
ceph_msg_dump(msg);
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Delayed work handler to process end of delayed cap release LRU list.
|
|
*/
|
|
void ceph_check_delayed_caps(struct ceph_mds_client *mdsc)
|
|
{
|
|
struct ceph_inode_info *ci;
|
|
int flags = CHECK_CAPS_NODELAY;
|
|
|
|
dout("check_delayed_caps\n");
|
|
while (1) {
|
|
spin_lock(&mdsc->cap_delay_lock);
|
|
if (list_empty(&mdsc->cap_delay_list))
|
|
break;
|
|
ci = list_first_entry(&mdsc->cap_delay_list,
|
|
struct ceph_inode_info,
|
|
i_cap_delay_list);
|
|
if ((ci->i_ceph_flags & CEPH_I_FLUSH) == 0 &&
|
|
time_before(jiffies, ci->i_hold_caps_max))
|
|
break;
|
|
list_del_init(&ci->i_cap_delay_list);
|
|
spin_unlock(&mdsc->cap_delay_lock);
|
|
dout("check_delayed_caps on %p\n", &ci->vfs_inode);
|
|
ceph_check_caps(ci, flags, NULL);
|
|
}
|
|
spin_unlock(&mdsc->cap_delay_lock);
|
|
}
|
|
|
|
/*
|
|
* Flush all dirty caps to the mds
|
|
*/
|
|
void ceph_flush_dirty_caps(struct ceph_mds_client *mdsc)
|
|
{
|
|
struct ceph_inode_info *ci, *nci = NULL;
|
|
struct inode *inode, *ninode = NULL;
|
|
struct list_head *p, *n;
|
|
|
|
dout("flush_dirty_caps\n");
|
|
spin_lock(&mdsc->cap_dirty_lock);
|
|
list_for_each_safe(p, n, &mdsc->cap_dirty) {
|
|
if (nci) {
|
|
ci = nci;
|
|
inode = ninode;
|
|
ci->i_ceph_flags &= ~CEPH_I_NOFLUSH;
|
|
dout("flush_dirty_caps inode %p (was next inode)\n",
|
|
inode);
|
|
} else {
|
|
ci = list_entry(p, struct ceph_inode_info,
|
|
i_dirty_item);
|
|
inode = igrab(&ci->vfs_inode);
|
|
BUG_ON(!inode);
|
|
dout("flush_dirty_caps inode %p\n", inode);
|
|
}
|
|
if (n != &mdsc->cap_dirty) {
|
|
nci = list_entry(n, struct ceph_inode_info,
|
|
i_dirty_item);
|
|
ninode = igrab(&nci->vfs_inode);
|
|
BUG_ON(!ninode);
|
|
nci->i_ceph_flags |= CEPH_I_NOFLUSH;
|
|
dout("flush_dirty_caps next inode %p, noflush\n",
|
|
ninode);
|
|
} else {
|
|
nci = NULL;
|
|
ninode = NULL;
|
|
}
|
|
spin_unlock(&mdsc->cap_dirty_lock);
|
|
if (inode) {
|
|
ceph_check_caps(ci, CHECK_CAPS_NODELAY|CHECK_CAPS_FLUSH,
|
|
NULL);
|
|
iput(inode);
|
|
}
|
|
spin_lock(&mdsc->cap_dirty_lock);
|
|
}
|
|
spin_unlock(&mdsc->cap_dirty_lock);
|
|
}
|
|
|
|
/*
|
|
* Drop open file reference. If we were the last open file,
|
|
* we may need to release capabilities to the MDS (or schedule
|
|
* their delayed release).
|
|
*/
|
|
void ceph_put_fmode(struct ceph_inode_info *ci, int fmode)
|
|
{
|
|
struct inode *inode = &ci->vfs_inode;
|
|
int last = 0;
|
|
|
|
spin_lock(&inode->i_lock);
|
|
dout("put_fmode %p fmode %d %d -> %d\n", inode, fmode,
|
|
ci->i_nr_by_mode[fmode], ci->i_nr_by_mode[fmode]-1);
|
|
BUG_ON(ci->i_nr_by_mode[fmode] == 0);
|
|
if (--ci->i_nr_by_mode[fmode] == 0)
|
|
last++;
|
|
spin_unlock(&inode->i_lock);
|
|
|
|
if (last && ci->i_vino.snap == CEPH_NOSNAP)
|
|
ceph_check_caps(ci, 0, NULL);
|
|
}
|
|
|
|
/*
|
|
* Helpers for embedding cap and dentry lease releases into mds
|
|
* requests.
|
|
*
|
|
* @force is used by dentry_release (below) to force inclusion of a
|
|
* record for the directory inode, even when there aren't any caps to
|
|
* drop.
|
|
*/
|
|
int ceph_encode_inode_release(void **p, struct inode *inode,
|
|
int mds, int drop, int unless, int force)
|
|
{
|
|
struct ceph_inode_info *ci = ceph_inode(inode);
|
|
struct ceph_cap *cap;
|
|
struct ceph_mds_request_release *rel = *p;
|
|
int used, dirty;
|
|
int ret = 0;
|
|
|
|
spin_lock(&inode->i_lock);
|
|
used = __ceph_caps_used(ci);
|
|
dirty = __ceph_caps_dirty(ci);
|
|
|
|
dout("encode_inode_release %p mds%d used|dirty %s drop %s unless %s\n",
|
|
inode, mds, ceph_cap_string(used|dirty), ceph_cap_string(drop),
|
|
ceph_cap_string(unless));
|
|
|
|
/* only drop unused, clean caps */
|
|
drop &= ~(used | dirty);
|
|
|
|
cap = __get_cap_for_mds(ci, mds);
|
|
if (cap && __cap_is_valid(cap)) {
|
|
if (force ||
|
|
((cap->issued & drop) &&
|
|
(cap->issued & unless) == 0)) {
|
|
if ((cap->issued & drop) &&
|
|
(cap->issued & unless) == 0) {
|
|
dout("encode_inode_release %p cap %p %s -> "
|
|
"%s\n", inode, cap,
|
|
ceph_cap_string(cap->issued),
|
|
ceph_cap_string(cap->issued & ~drop));
|
|
cap->issued &= ~drop;
|
|
cap->implemented &= ~drop;
|
|
if (ci->i_ceph_flags & CEPH_I_NODELAY) {
|
|
int wanted = __ceph_caps_wanted(ci);
|
|
dout(" wanted %s -> %s (act %s)\n",
|
|
ceph_cap_string(cap->mds_wanted),
|
|
ceph_cap_string(cap->mds_wanted &
|
|
~wanted),
|
|
ceph_cap_string(wanted));
|
|
cap->mds_wanted &= wanted;
|
|
}
|
|
} else {
|
|
dout("encode_inode_release %p cap %p %s"
|
|
" (force)\n", inode, cap,
|
|
ceph_cap_string(cap->issued));
|
|
}
|
|
|
|
rel->ino = cpu_to_le64(ceph_ino(inode));
|
|
rel->cap_id = cpu_to_le64(cap->cap_id);
|
|
rel->seq = cpu_to_le32(cap->seq);
|
|
rel->issue_seq = cpu_to_le32(cap->issue_seq),
|
|
rel->mseq = cpu_to_le32(cap->mseq);
|
|
rel->caps = cpu_to_le32(cap->issued);
|
|
rel->wanted = cpu_to_le32(cap->mds_wanted);
|
|
rel->dname_len = 0;
|
|
rel->dname_seq = 0;
|
|
*p += sizeof(*rel);
|
|
ret = 1;
|
|
} else {
|
|
dout("encode_inode_release %p cap %p %s\n",
|
|
inode, cap, ceph_cap_string(cap->issued));
|
|
}
|
|
}
|
|
spin_unlock(&inode->i_lock);
|
|
return ret;
|
|
}
|
|
|
|
int ceph_encode_dentry_release(void **p, struct dentry *dentry,
|
|
int mds, int drop, int unless)
|
|
{
|
|
struct inode *dir = dentry->d_parent->d_inode;
|
|
struct ceph_mds_request_release *rel = *p;
|
|
struct ceph_dentry_info *di = ceph_dentry(dentry);
|
|
int force = 0;
|
|
int ret;
|
|
|
|
/*
|
|
* force an record for the directory caps if we have a dentry lease.
|
|
* this is racy (can't take i_lock and d_lock together), but it
|
|
* doesn't have to be perfect; the mds will revoke anything we don't
|
|
* release.
|
|
*/
|
|
spin_lock(&dentry->d_lock);
|
|
if (di->lease_session && di->lease_session->s_mds == mds)
|
|
force = 1;
|
|
spin_unlock(&dentry->d_lock);
|
|
|
|
ret = ceph_encode_inode_release(p, dir, mds, drop, unless, force);
|
|
|
|
spin_lock(&dentry->d_lock);
|
|
if (ret && di->lease_session && di->lease_session->s_mds == mds) {
|
|
dout("encode_dentry_release %p mds%d seq %d\n",
|
|
dentry, mds, (int)di->lease_seq);
|
|
rel->dname_len = cpu_to_le32(dentry->d_name.len);
|
|
memcpy(*p, dentry->d_name.name, dentry->d_name.len);
|
|
*p += dentry->d_name.len;
|
|
rel->dname_seq = cpu_to_le32(di->lease_seq);
|
|
__ceph_mdsc_drop_dentry_lease(dentry);
|
|
}
|
|
spin_unlock(&dentry->d_lock);
|
|
return ret;
|
|
}
|