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NFSv4.1 move deviceid cache to filelayout driver
No need for generic cache with only one user. Keep a simple hash of deviceids in the filelayout driver. Signed-off-by: Christoph Hellwig <hch@infradead.org> Acked-by: Andy Adamson <andros@netapp.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Christoph Hellwig
Trond Myklebust
parent
cbdabc7f8b
commit
ea8eecdd11
@ -42,32 +42,6 @@ MODULE_DESCRIPTION("The NFSv4 file layout driver");
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#define FILELAYOUT_POLL_RETRY_MAX (15*HZ)
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static int
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filelayout_set_layoutdriver(struct nfs_server *nfss)
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{
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int status = pnfs_alloc_init_deviceid_cache(nfss->nfs_client,
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nfs4_fl_free_deviceid_callback);
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if (status) {
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printk(KERN_WARNING "%s: deviceid cache could not be "
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"initialized\n", __func__);
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return status;
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}
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dprintk("%s: deviceid cache has been initialized successfully\n",
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__func__);
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return 0;
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}
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/* Clear out the layout by destroying its device list */
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static int
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filelayout_clear_layoutdriver(struct nfs_server *nfss)
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{
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dprintk("--> %s\n", __func__);
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if (nfss->nfs_client->cl_devid_cache)
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pnfs_put_deviceid_cache(nfss->nfs_client);
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return 0;
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}
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static loff_t
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filelayout_get_dense_offset(struct nfs4_filelayout_segment *flseg,
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loff_t offset)
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@ -295,7 +269,7 @@ filelayout_check_layout(struct pnfs_layout_hdr *lo,
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}
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/* find and reference the deviceid */
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dsaddr = nfs4_fl_find_get_deviceid(nfss->nfs_client, id);
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dsaddr = nfs4_fl_find_get_deviceid(id);
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if (dsaddr == NULL) {
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dsaddr = get_device_info(lo->plh_inode, id);
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if (dsaddr == NULL)
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@ -330,7 +304,7 @@ out:
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dprintk("--> %s returns %d\n", __func__, status);
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return status;
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out_put:
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pnfs_put_deviceid(nfss->nfs_client->cl_devid_cache, &dsaddr->deviceid);
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nfs4_fl_put_deviceid(dsaddr);
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goto out;
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}
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@ -439,12 +413,10 @@ filelayout_alloc_lseg(struct pnfs_layout_hdr *layoutid,
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static void
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filelayout_free_lseg(struct pnfs_layout_segment *lseg)
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{
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struct nfs_server *nfss = NFS_SERVER(lseg->pls_layout->plh_inode);
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struct nfs4_filelayout_segment *fl = FILELAYOUT_LSEG(lseg);
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dprintk("--> %s\n", __func__);
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pnfs_put_deviceid(nfss->nfs_client->cl_devid_cache,
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&fl->dsaddr->deviceid);
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nfs4_fl_put_deviceid(fl->dsaddr);
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_filelayout_free_lseg(fl);
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}
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@ -474,13 +446,11 @@ filelayout_pg_test(struct nfs_pageio_descriptor *pgio, struct nfs_page *prev,
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}
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static struct pnfs_layoutdriver_type filelayout_type = {
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.id = LAYOUT_NFSV4_1_FILES,
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.name = "LAYOUT_NFSV4_1_FILES",
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.owner = THIS_MODULE,
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.set_layoutdriver = filelayout_set_layoutdriver,
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.clear_layoutdriver = filelayout_clear_layoutdriver,
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.alloc_lseg = filelayout_alloc_lseg,
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.free_lseg = filelayout_free_lseg,
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.id = LAYOUT_NFSV4_1_FILES,
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.name = "LAYOUT_NFSV4_1_FILES",
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.owner = THIS_MODULE,
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.alloc_lseg = filelayout_alloc_lseg,
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.free_lseg = filelayout_free_lseg,
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.pg_test = filelayout_pg_test,
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.read_pagelist = filelayout_read_pagelist,
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};
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@ -56,7 +56,9 @@ struct nfs4_pnfs_ds {
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};
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struct nfs4_file_layout_dsaddr {
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struct pnfs_deviceid_node deviceid;
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struct hlist_node node;
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struct nfs4_deviceid deviceid;
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atomic_t ref;
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u32 stripe_count;
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u8 *stripe_indices;
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u32 ds_num;
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@ -86,7 +88,6 @@ FILELAYOUT_LSEG(struct pnfs_layout_segment *lseg)
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extern struct nfs_fh *
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nfs4_fl_select_ds_fh(struct pnfs_layout_segment *lseg, u32 j);
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extern void nfs4_fl_free_deviceid_callback(struct pnfs_deviceid_node *);
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extern void print_ds(struct nfs4_pnfs_ds *ds);
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extern void print_deviceid(struct nfs4_deviceid *dev_id);
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u32 nfs4_fl_calc_j_index(struct pnfs_layout_segment *lseg, loff_t offset);
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@ -94,7 +95,8 @@ u32 nfs4_fl_calc_ds_index(struct pnfs_layout_segment *lseg, u32 j);
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struct nfs4_pnfs_ds *nfs4_fl_prepare_ds(struct pnfs_layout_segment *lseg,
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u32 ds_idx);
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extern struct nfs4_file_layout_dsaddr *
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nfs4_fl_find_get_deviceid(struct nfs_client *, struct nfs4_deviceid *dev_id);
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nfs4_fl_find_get_deviceid(struct nfs4_deviceid *dev_id);
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extern void nfs4_fl_put_deviceid(struct nfs4_file_layout_dsaddr *dsaddr);
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struct nfs4_file_layout_dsaddr *
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get_device_info(struct inode *inode, struct nfs4_deviceid *dev_id);
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@ -36,6 +36,30 @@
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#define NFSDBG_FACILITY NFSDBG_PNFS_LD
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/*
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* Device ID RCU cache. A device ID is unique per client ID and layout type.
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*/
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#define NFS4_FL_DEVICE_ID_HASH_BITS 5
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#define NFS4_FL_DEVICE_ID_HASH_SIZE (1 << NFS4_FL_DEVICE_ID_HASH_BITS)
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#define NFS4_FL_DEVICE_ID_HASH_MASK (NFS4_FL_DEVICE_ID_HASH_SIZE - 1)
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static inline u32
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nfs4_fl_deviceid_hash(struct nfs4_deviceid *id)
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{
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unsigned char *cptr = (unsigned char *)id->data;
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unsigned int nbytes = NFS4_DEVICEID4_SIZE;
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u32 x = 0;
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while (nbytes--) {
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x *= 37;
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x += *cptr++;
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}
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return x & NFS4_FL_DEVICE_ID_HASH_MASK;
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}
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static struct hlist_head filelayout_deviceid_cache[NFS4_FL_DEVICE_ID_HASH_SIZE];
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static DEFINE_SPINLOCK(filelayout_deviceid_lock);
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/*
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* Data server cache
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*
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@ -183,7 +207,7 @@ nfs4_fl_free_deviceid(struct nfs4_file_layout_dsaddr *dsaddr)
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struct nfs4_pnfs_ds *ds;
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int i;
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print_deviceid(&dsaddr->deviceid.de_id);
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print_deviceid(&dsaddr->deviceid);
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for (i = 0; i < dsaddr->ds_num; i++) {
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ds = dsaddr->ds_list[i];
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@ -200,15 +224,6 @@ nfs4_fl_free_deviceid(struct nfs4_file_layout_dsaddr *dsaddr)
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kfree(dsaddr);
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}
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void
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nfs4_fl_free_deviceid_callback(struct pnfs_deviceid_node *device)
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{
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struct nfs4_file_layout_dsaddr *dsaddr =
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container_of(device, struct nfs4_file_layout_dsaddr, deviceid);
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nfs4_fl_free_deviceid(dsaddr);
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}
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static struct nfs4_pnfs_ds *
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nfs4_pnfs_ds_add(struct inode *inode, u32 ip_addr, u32 port)
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{
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@ -361,7 +376,7 @@ decode_device(struct inode *ino, struct pnfs_device *pdev)
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dsaddr->stripe_count = cnt;
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dsaddr->ds_num = num;
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memcpy(&dsaddr->deviceid.de_id, &pdev->dev_id, sizeof(pdev->dev_id));
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memcpy(&dsaddr->deviceid, &pdev->dev_id, sizeof(pdev->dev_id));
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/* Go back an read stripe indices */
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p = indicesp;
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@ -411,28 +426,37 @@ out_err:
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}
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/*
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* Decode the opaque device specified in 'dev'
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* and add it to the list of available devices.
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* If the deviceid is already cached, nfs4_add_deviceid will return
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* a pointer to the cached struct and throw away the new.
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* Decode the opaque device specified in 'dev' and add it to the cache of
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* available devices.
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*/
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static struct nfs4_file_layout_dsaddr*
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static struct nfs4_file_layout_dsaddr *
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decode_and_add_device(struct inode *inode, struct pnfs_device *dev)
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{
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struct nfs4_file_layout_dsaddr *dsaddr;
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struct pnfs_deviceid_node *d;
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struct nfs4_file_layout_dsaddr *d, *new;
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long hash;
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dsaddr = decode_device(inode, dev);
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if (!dsaddr) {
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new = decode_device(inode, dev);
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if (!new) {
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printk(KERN_WARNING "%s: Could not decode or add device\n",
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__func__);
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return NULL;
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}
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d = pnfs_add_deviceid(NFS_SERVER(inode)->nfs_client->cl_devid_cache,
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&dsaddr->deviceid);
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spin_lock(&filelayout_deviceid_lock);
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d = nfs4_fl_find_get_deviceid(&new->deviceid);
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if (d) {
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spin_unlock(&filelayout_deviceid_lock);
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nfs4_fl_free_deviceid(new);
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return d;
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}
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return container_of(d, struct nfs4_file_layout_dsaddr, deviceid);
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INIT_HLIST_NODE(&new->node);
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atomic_set(&new->ref, 1);
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hash = nfs4_fl_deviceid_hash(&new->deviceid);
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hlist_add_head_rcu(&new->node, &filelayout_deviceid_cache[hash]);
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spin_unlock(&filelayout_deviceid_lock);
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return new;
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}
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/*
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@ -507,14 +531,38 @@ out_free:
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return dsaddr;
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}
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struct nfs4_file_layout_dsaddr *
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nfs4_fl_find_get_deviceid(struct nfs_client *clp, struct nfs4_deviceid *id)
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void
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nfs4_fl_put_deviceid(struct nfs4_file_layout_dsaddr *dsaddr)
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{
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struct pnfs_deviceid_node *d;
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if (atomic_dec_and_lock(&dsaddr->ref, &filelayout_deviceid_lock)) {
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hlist_del_rcu(&dsaddr->node);
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spin_unlock(&filelayout_deviceid_lock);
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d = pnfs_find_get_deviceid(clp->cl_devid_cache, id);
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return (d == NULL) ? NULL :
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container_of(d, struct nfs4_file_layout_dsaddr, deviceid);
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synchronize_rcu();
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nfs4_fl_free_deviceid(dsaddr);
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}
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}
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struct nfs4_file_layout_dsaddr *
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nfs4_fl_find_get_deviceid(struct nfs4_deviceid *id)
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{
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struct nfs4_file_layout_dsaddr *d;
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struct hlist_node *n;
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long hash = nfs4_fl_deviceid_hash(id);
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rcu_read_lock();
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hlist_for_each_entry_rcu(d, n, &filelayout_deviceid_cache[hash], node) {
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if (!memcmp(&d->deviceid, id, sizeof(*id))) {
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if (!atomic_inc_not_zero(&d->ref))
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goto fail;
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rcu_read_unlock();
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return d;
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}
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}
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fail:
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rcu_read_unlock();
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return NULL;
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}
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/*
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147
fs/nfs/pnfs.c
147
fs/nfs/pnfs.c
@ -75,10 +75,8 @@ find_pnfs_driver(u32 id)
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void
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unset_pnfs_layoutdriver(struct nfs_server *nfss)
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{
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if (nfss->pnfs_curr_ld) {
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nfss->pnfs_curr_ld->clear_layoutdriver(nfss);
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if (nfss->pnfs_curr_ld)
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module_put(nfss->pnfs_curr_ld->owner);
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}
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nfss->pnfs_curr_ld = NULL;
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}
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@ -116,13 +114,7 @@ set_pnfs_layoutdriver(struct nfs_server *server, u32 id)
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goto out_no_driver;
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}
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server->pnfs_curr_ld = ld_type;
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if (ld_type->set_layoutdriver(server)) {
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printk(KERN_ERR
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"%s: Error initializing mount point for layout driver %u.\n",
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__func__, id);
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module_put(ld_type->owner);
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goto out_no_driver;
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}
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dprintk("%s: pNFS module for %u set\n", __func__, id);
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return;
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@ -906,138 +898,3 @@ pnfs_try_to_read_data(struct nfs_read_data *rdata,
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dprintk("%s End (trypnfs:%d)\n", __func__, trypnfs);
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return trypnfs;
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}
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/*
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* Device ID cache. Currently supports one layout type per struct nfs_client.
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* Add layout type to the lookup key to expand to support multiple types.
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*/
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int
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pnfs_alloc_init_deviceid_cache(struct nfs_client *clp,
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void (*free_callback)(struct pnfs_deviceid_node *))
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{
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struct pnfs_deviceid_cache *c;
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c = kzalloc(sizeof(struct pnfs_deviceid_cache), GFP_KERNEL);
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if (!c)
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return -ENOMEM;
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spin_lock(&clp->cl_lock);
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if (clp->cl_devid_cache != NULL) {
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atomic_inc(&clp->cl_devid_cache->dc_ref);
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dprintk("%s [kref [%d]]\n", __func__,
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atomic_read(&clp->cl_devid_cache->dc_ref));
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kfree(c);
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} else {
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/* kzalloc initializes hlists */
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spin_lock_init(&c->dc_lock);
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atomic_set(&c->dc_ref, 1);
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c->dc_free_callback = free_callback;
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clp->cl_devid_cache = c;
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dprintk("%s [new]\n", __func__);
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}
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spin_unlock(&clp->cl_lock);
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return 0;
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}
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EXPORT_SYMBOL_GPL(pnfs_alloc_init_deviceid_cache);
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/*
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* Called from pnfs_layoutdriver_type->free_lseg
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* last layout segment reference frees deviceid
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*/
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void
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pnfs_put_deviceid(struct pnfs_deviceid_cache *c,
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struct pnfs_deviceid_node *devid)
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{
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struct nfs4_deviceid *id = &devid->de_id;
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struct pnfs_deviceid_node *d;
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struct hlist_node *n;
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long h = nfs4_deviceid_hash(id);
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dprintk("%s [%d]\n", __func__, atomic_read(&devid->de_ref));
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if (!atomic_dec_and_lock(&devid->de_ref, &c->dc_lock))
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return;
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hlist_for_each_entry_rcu(d, n, &c->dc_deviceids[h], de_node)
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if (!memcmp(&d->de_id, id, sizeof(*id))) {
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hlist_del_rcu(&d->de_node);
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spin_unlock(&c->dc_lock);
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synchronize_rcu();
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c->dc_free_callback(devid);
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return;
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}
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spin_unlock(&c->dc_lock);
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/* Why wasn't it found in the list? */
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BUG();
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}
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EXPORT_SYMBOL_GPL(pnfs_put_deviceid);
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/* Find and reference a deviceid */
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struct pnfs_deviceid_node *
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pnfs_find_get_deviceid(struct pnfs_deviceid_cache *c, struct nfs4_deviceid *id)
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{
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struct pnfs_deviceid_node *d;
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struct hlist_node *n;
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long hash = nfs4_deviceid_hash(id);
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dprintk("--> %s hash %ld\n", __func__, hash);
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rcu_read_lock();
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hlist_for_each_entry_rcu(d, n, &c->dc_deviceids[hash], de_node) {
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if (!memcmp(&d->de_id, id, sizeof(*id))) {
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if (!atomic_inc_not_zero(&d->de_ref)) {
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goto fail;
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} else {
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rcu_read_unlock();
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return d;
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}
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}
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}
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fail:
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rcu_read_unlock();
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return NULL;
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}
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EXPORT_SYMBOL_GPL(pnfs_find_get_deviceid);
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/*
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* Add a deviceid to the cache.
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* GETDEVICEINFOs for same deviceid can race. If deviceid is found, discard new
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*/
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struct pnfs_deviceid_node *
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pnfs_add_deviceid(struct pnfs_deviceid_cache *c, struct pnfs_deviceid_node *new)
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{
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struct pnfs_deviceid_node *d;
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long hash = nfs4_deviceid_hash(&new->de_id);
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dprintk("--> %s hash %ld\n", __func__, hash);
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spin_lock(&c->dc_lock);
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d = pnfs_find_get_deviceid(c, &new->de_id);
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if (d) {
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spin_unlock(&c->dc_lock);
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dprintk("%s [discard]\n", __func__);
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c->dc_free_callback(new);
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return d;
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}
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INIT_HLIST_NODE(&new->de_node);
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atomic_set(&new->de_ref, 1);
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hlist_add_head_rcu(&new->de_node, &c->dc_deviceids[hash]);
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spin_unlock(&c->dc_lock);
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dprintk("%s [new]\n", __func__);
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return new;
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}
|
||||
EXPORT_SYMBOL_GPL(pnfs_add_deviceid);
|
||||
|
||||
void
|
||||
pnfs_put_deviceid_cache(struct nfs_client *clp)
|
||||
{
|
||||
struct pnfs_deviceid_cache *local = clp->cl_devid_cache;
|
||||
|
||||
dprintk("--> %s ({%d})\n", __func__, atomic_read(&local->dc_ref));
|
||||
if (atomic_dec_and_lock(&local->dc_ref, &clp->cl_lock)) {
|
||||
int i;
|
||||
/* Verify cache is empty */
|
||||
for (i = 0; i < NFS4_DEVICE_ID_HASH_SIZE; i++)
|
||||
BUG_ON(!hlist_empty(&local->dc_deviceids[i]));
|
||||
clp->cl_devid_cache = NULL;
|
||||
spin_unlock(&clp->cl_lock);
|
||||
kfree(local);
|
||||
}
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(pnfs_put_deviceid_cache);
|
||||
|
||||
@ -68,8 +68,6 @@ struct pnfs_layoutdriver_type {
|
||||
const u32 id;
|
||||
const char *name;
|
||||
struct module *owner;
|
||||
int (*set_layoutdriver) (struct nfs_server *);
|
||||
int (*clear_layoutdriver) (struct nfs_server *);
|
||||
struct pnfs_layout_segment * (*alloc_lseg) (struct pnfs_layout_hdr *layoutid, struct nfs4_layoutget_res *lgr);
|
||||
void (*free_lseg) (struct pnfs_layout_segment *lseg);
|
||||
|
||||
@ -106,52 +104,6 @@ struct pnfs_device {
|
||||
unsigned int pglen;
|
||||
};
|
||||
|
||||
/*
|
||||
* Device ID RCU cache. A device ID is unique per client ID and layout type.
|
||||
*/
|
||||
#define NFS4_DEVICE_ID_HASH_BITS 5
|
||||
#define NFS4_DEVICE_ID_HASH_SIZE (1 << NFS4_DEVICE_ID_HASH_BITS)
|
||||
#define NFS4_DEVICE_ID_HASH_MASK (NFS4_DEVICE_ID_HASH_SIZE - 1)
|
||||
|
||||
static inline u32
|
||||
nfs4_deviceid_hash(struct nfs4_deviceid *id)
|
||||
{
|
||||
unsigned char *cptr = (unsigned char *)id->data;
|
||||
unsigned int nbytes = NFS4_DEVICEID4_SIZE;
|
||||
u32 x = 0;
|
||||
|
||||
while (nbytes--) {
|
||||
x *= 37;
|
||||
x += *cptr++;
|
||||
}
|
||||
return x & NFS4_DEVICE_ID_HASH_MASK;
|
||||
}
|
||||
|
||||
struct pnfs_deviceid_node {
|
||||
struct hlist_node de_node;
|
||||
struct nfs4_deviceid de_id;
|
||||
atomic_t de_ref;
|
||||
};
|
||||
|
||||
struct pnfs_deviceid_cache {
|
||||
spinlock_t dc_lock;
|
||||
atomic_t dc_ref;
|
||||
void (*dc_free_callback)(struct pnfs_deviceid_node *);
|
||||
struct hlist_head dc_deviceids[NFS4_DEVICE_ID_HASH_SIZE];
|
||||
};
|
||||
|
||||
extern int pnfs_alloc_init_deviceid_cache(struct nfs_client *,
|
||||
void (*free_callback)(struct pnfs_deviceid_node *));
|
||||
extern void pnfs_put_deviceid_cache(struct nfs_client *);
|
||||
extern struct pnfs_deviceid_node *pnfs_find_get_deviceid(
|
||||
struct pnfs_deviceid_cache *,
|
||||
struct nfs4_deviceid *);
|
||||
extern struct pnfs_deviceid_node *pnfs_add_deviceid(
|
||||
struct pnfs_deviceid_cache *,
|
||||
struct pnfs_deviceid_node *);
|
||||
extern void pnfs_put_deviceid(struct pnfs_deviceid_cache *c,
|
||||
struct pnfs_deviceid_node *devid);
|
||||
|
||||
extern int pnfs_register_layoutdriver(struct pnfs_layoutdriver_type *);
|
||||
extern void pnfs_unregister_layoutdriver(struct pnfs_layoutdriver_type *);
|
||||
|
||||
|
||||
@ -77,7 +77,6 @@ struct nfs_client {
|
||||
u32 cl_exchange_flags;
|
||||
struct nfs4_session *cl_session; /* sharred session */
|
||||
struct list_head cl_layouts;
|
||||
struct pnfs_deviceid_cache *cl_devid_cache; /* pNFS deviceid cache */
|
||||
#endif /* CONFIG_NFS_V4 */
|
||||
|
||||
#ifdef CONFIG_NFS_FSCACHE
|
||||
|
||||
Loading…
Reference in New Issue
Block a user