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227 lines
5.6 KiB
227 lines
5.6 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Ceph cache definitions. |
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* |
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* Copyright (C) 2013 by Adfin Solutions, Inc. All Rights Reserved. |
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* Written by Milosz Tanski ([email protected]) |
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*/ |
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#include <linux/ceph/ceph_debug.h> |
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#include <linux/fs_context.h> |
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#include "super.h" |
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#include "cache.h" |
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struct ceph_aux_inode { |
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u64 version; |
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u64 mtime_sec; |
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u64 mtime_nsec; |
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}; |
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struct fscache_netfs ceph_cache_netfs = { |
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.name = "ceph", |
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.version = 0, |
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}; |
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static DEFINE_MUTEX(ceph_fscache_lock); |
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static LIST_HEAD(ceph_fscache_list); |
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struct ceph_fscache_entry { |
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struct list_head list; |
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struct fscache_cookie *fscache; |
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size_t uniq_len; |
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/* The following members must be last */ |
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struct ceph_fsid fsid; |
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char uniquifier[]; |
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}; |
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static const struct fscache_cookie_def ceph_fscache_fsid_object_def = { |
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.name = "CEPH.fsid", |
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.type = FSCACHE_COOKIE_TYPE_INDEX, |
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}; |
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int __init ceph_fscache_register(void) |
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{ |
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return fscache_register_netfs(&ceph_cache_netfs); |
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} |
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void ceph_fscache_unregister(void) |
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{ |
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fscache_unregister_netfs(&ceph_cache_netfs); |
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} |
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int ceph_fscache_register_fs(struct ceph_fs_client* fsc, struct fs_context *fc) |
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{ |
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const struct ceph_fsid *fsid = &fsc->client->fsid; |
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const char *fscache_uniq = fsc->mount_options->fscache_uniq; |
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size_t uniq_len = fscache_uniq ? strlen(fscache_uniq) : 0; |
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struct ceph_fscache_entry *ent; |
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int err = 0; |
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mutex_lock(&ceph_fscache_lock); |
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list_for_each_entry(ent, &ceph_fscache_list, list) { |
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if (memcmp(&ent->fsid, fsid, sizeof(*fsid))) |
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continue; |
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if (ent->uniq_len != uniq_len) |
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continue; |
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if (uniq_len && memcmp(ent->uniquifier, fscache_uniq, uniq_len)) |
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continue; |
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errorfc(fc, "fscache cookie already registered for fsid %pU, use fsc=<uniquifier> option", |
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fsid); |
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err = -EBUSY; |
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goto out_unlock; |
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} |
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ent = kzalloc(sizeof(*ent) + uniq_len, GFP_KERNEL); |
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if (!ent) { |
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err = -ENOMEM; |
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goto out_unlock; |
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} |
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memcpy(&ent->fsid, fsid, sizeof(*fsid)); |
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if (uniq_len > 0) { |
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memcpy(&ent->uniquifier, fscache_uniq, uniq_len); |
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ent->uniq_len = uniq_len; |
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} |
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fsc->fscache = fscache_acquire_cookie(ceph_cache_netfs.primary_index, |
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&ceph_fscache_fsid_object_def, |
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&ent->fsid, sizeof(ent->fsid) + uniq_len, |
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NULL, 0, |
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fsc, 0, true); |
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if (fsc->fscache) { |
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ent->fscache = fsc->fscache; |
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list_add_tail(&ent->list, &ceph_fscache_list); |
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} else { |
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kfree(ent); |
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errorfc(fc, "unable to register fscache cookie for fsid %pU", |
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fsid); |
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/* all other fs ignore this error */ |
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} |
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out_unlock: |
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mutex_unlock(&ceph_fscache_lock); |
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return err; |
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} |
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static enum fscache_checkaux ceph_fscache_inode_check_aux( |
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void *cookie_netfs_data, const void *data, uint16_t dlen, |
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loff_t object_size) |
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{ |
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struct ceph_aux_inode aux; |
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struct ceph_inode_info* ci = cookie_netfs_data; |
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struct inode* inode = &ci->vfs_inode; |
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if (dlen != sizeof(aux) || |
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i_size_read(inode) != object_size) |
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return FSCACHE_CHECKAUX_OBSOLETE; |
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memset(&aux, 0, sizeof(aux)); |
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aux.version = ci->i_version; |
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aux.mtime_sec = inode->i_mtime.tv_sec; |
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aux.mtime_nsec = inode->i_mtime.tv_nsec; |
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if (memcmp(data, &aux, sizeof(aux)) != 0) |
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return FSCACHE_CHECKAUX_OBSOLETE; |
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dout("ceph inode 0x%p cached okay\n", ci); |
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return FSCACHE_CHECKAUX_OKAY; |
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} |
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static const struct fscache_cookie_def ceph_fscache_inode_object_def = { |
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.name = "CEPH.inode", |
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.type = FSCACHE_COOKIE_TYPE_DATAFILE, |
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.check_aux = ceph_fscache_inode_check_aux, |
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}; |
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void ceph_fscache_register_inode_cookie(struct inode *inode) |
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{ |
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struct ceph_inode_info *ci = ceph_inode(inode); |
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struct ceph_fs_client *fsc = ceph_inode_to_client(inode); |
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struct ceph_aux_inode aux; |
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/* No caching for filesystem */ |
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if (!fsc->fscache) |
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return; |
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/* Only cache for regular files that are read only */ |
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if (!S_ISREG(inode->i_mode)) |
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return; |
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inode_lock_nested(inode, I_MUTEX_CHILD); |
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if (!ci->fscache) { |
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memset(&aux, 0, sizeof(aux)); |
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aux.version = ci->i_version; |
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aux.mtime_sec = inode->i_mtime.tv_sec; |
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aux.mtime_nsec = inode->i_mtime.tv_nsec; |
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ci->fscache = fscache_acquire_cookie(fsc->fscache, |
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&ceph_fscache_inode_object_def, |
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&ci->i_vino, sizeof(ci->i_vino), |
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&aux, sizeof(aux), |
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ci, i_size_read(inode), false); |
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} |
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inode_unlock(inode); |
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} |
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void ceph_fscache_unregister_inode_cookie(struct ceph_inode_info* ci) |
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{ |
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struct fscache_cookie* cookie; |
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if ((cookie = ci->fscache) == NULL) |
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return; |
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ci->fscache = NULL; |
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fscache_relinquish_cookie(cookie, &ci->i_vino, false); |
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} |
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static bool ceph_fscache_can_enable(void *data) |
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{ |
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struct inode *inode = data; |
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return !inode_is_open_for_write(inode); |
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} |
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void ceph_fscache_file_set_cookie(struct inode *inode, struct file *filp) |
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{ |
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struct ceph_inode_info *ci = ceph_inode(inode); |
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if (!fscache_cookie_valid(ci->fscache)) |
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return; |
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if (inode_is_open_for_write(inode)) { |
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dout("fscache_file_set_cookie %p %p disabling cache\n", |
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inode, filp); |
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fscache_disable_cookie(ci->fscache, &ci->i_vino, false); |
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} else { |
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fscache_enable_cookie(ci->fscache, &ci->i_vino, i_size_read(inode), |
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ceph_fscache_can_enable, inode); |
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if (fscache_cookie_enabled(ci->fscache)) { |
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dout("fscache_file_set_cookie %p %p enabling cache\n", |
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inode, filp); |
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} |
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} |
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} |
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void ceph_fscache_unregister_fs(struct ceph_fs_client* fsc) |
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{ |
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if (fscache_cookie_valid(fsc->fscache)) { |
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struct ceph_fscache_entry *ent; |
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bool found = false; |
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mutex_lock(&ceph_fscache_lock); |
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list_for_each_entry(ent, &ceph_fscache_list, list) { |
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if (ent->fscache == fsc->fscache) { |
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list_del(&ent->list); |
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kfree(ent); |
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found = true; |
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break; |
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} |
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} |
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WARN_ON_ONCE(!found); |
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mutex_unlock(&ceph_fscache_lock); |
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__fscache_relinquish_cookie(fsc->fscache, NULL, false); |
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} |
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fsc->fscache = NULL; |
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}
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