On Wed, 21 Aug 2013, Milosz Tanski wrote: > Adding support for fscache to the Ceph filesystem. This would bring it to on > par with some of the other network filesystems in Linux (like NFS, AFS, > etc...) > > In order to mount the filesystem with fscache the 'fsc' mount option must be > passed. > > Signed-off-by: Milosz Tanski <mil...@adfin.com>
I fixed up a couple build errors when adding this to the tree and realized a few things need to be cleaned up first. Basically, any #ifdef CONFIG_CEPH_FSCACHE outside of a header file is a no-no. Everything in cache.h that is outside of the #ifdef block should be moved in, and no-op variants added in the #else block. More below: > --- > fs/ceph/Kconfig | 9 ++ > fs/ceph/Makefile | 2 + > fs/ceph/addr.c | 37 +++++-- > fs/ceph/cache.c | 311 > +++++++++++++++++++++++++++++++++++++++++++++++++++++++ > fs/ceph/cache.h | 123 ++++++++++++++++++++++ > fs/ceph/caps.c | 19 +++- > fs/ceph/file.c | 17 +++ > fs/ceph/inode.c | 66 +++++++++++- > fs/ceph/super.c | 47 ++++++++- > fs/ceph/super.h | 17 +++ > 10 files changed, 636 insertions(+), 12 deletions(-) > create mode 100644 fs/ceph/cache.c > create mode 100644 fs/ceph/cache.h > > diff --git a/fs/ceph/Kconfig b/fs/ceph/Kconfig > index 49bc782..ac9a2ef 100644 > --- a/fs/ceph/Kconfig > +++ b/fs/ceph/Kconfig > @@ -16,3 +16,12 @@ config CEPH_FS > > If unsure, say N. > > +if CEPH_FS > +config CEPH_FSCACHE > + bool "Enable Ceph client caching support" > + depends on CEPH_FS=m && FSCACHE || CEPH_FS=y && FSCACHE=y > + help > + Choose Y here to enable persistent, read-only local > + caching support for Ceph clients using FS-Cache > + > +endif > diff --git a/fs/ceph/Makefile b/fs/ceph/Makefile > index bd35212..0af0678 100644 > --- a/fs/ceph/Makefile > +++ b/fs/ceph/Makefile > @@ -9,3 +9,5 @@ ceph-y := super.o inode.o dir.o file.o locks.o addr.o ioctl.o > \ > mds_client.o mdsmap.o strings.o ceph_frag.o \ > debugfs.o > > +ceph-$(CONFIG_CEPH_FSCACHE) += cache.o > + > diff --git a/fs/ceph/addr.c b/fs/ceph/addr.c > index cb78ce8..632bb48 100644 > --- a/fs/ceph/addr.c > +++ b/fs/ceph/addr.c > @@ -11,6 +11,7 @@ > > #include "super.h" > #include "mds_client.h" > +#include "cache.h" > #include <linux/ceph/osd_client.h> > > /* > @@ -159,6 +160,11 @@ static void ceph_invalidatepage(struct page *page, > unsigned int offset, > return; > } > > + ceph_invalidate_fscache_page(inode, page); > + > + if (!PagePrivate(page)) > + return; > + > /* > * We can get non-dirty pages here due to races between > * set_page_dirty and truncate_complete_page; just spit out a > @@ -178,14 +184,17 @@ static void ceph_invalidatepage(struct page *page, > unsigned int offset, > ClearPagePrivate(page); > } > > -/* just a sanity check */ > static int ceph_releasepage(struct page *page, gfp_t g) > { > struct inode *inode = page->mapping ? page->mapping->host : NULL; > dout("%p releasepage %p idx %lu\n", inode, page, page->index); > WARN_ON(PageDirty(page)); > - WARN_ON(PagePrivate(page)); > - return 0; > + > + /* Can we release the page from the cache? */ > + if (!ceph_release_fscache_page(page, g)) > + return 0; > + > + return !PagePrivate(page); > } > > /* > @@ -195,11 +204,16 @@ static int readpage_nounlock(struct file *filp, struct > page *page) > { > struct inode *inode = file_inode(filp); > struct ceph_inode_info *ci = ceph_inode(inode); > - struct ceph_osd_client *osdc = > + struct ceph_osd_client *osdc = > &ceph_inode_to_client(inode)->client->osdc; > int err = 0; > u64 len = PAGE_CACHE_SIZE; > > + err = ceph_readpage_from_fscache(inode, page); > + > + if (err == 0) > + goto out; > + > dout("readpage inode %p file %p page %p index %lu\n", > inode, filp, page, page->index); > err = ceph_osdc_readpages(osdc, ceph_vino(inode), &ci->i_layout, > @@ -217,6 +231,9 @@ static int readpage_nounlock(struct file *filp, struct > page *page) > } > SetPageUptodate(page); > > + if (err == 0) > + ceph_readpage_to_fscache(inode, page); > + > out: > return err < 0 ? err : 0; > } > @@ -259,6 +276,7 @@ static void finish_read(struct ceph_osd_request *req, > struct ceph_msg *msg) > page->index); > flush_dcache_page(page); > SetPageUptodate(page); > + ceph_readpage_to_fscache(inode, page); > unlock_page(page); > page_cache_release(page); > bytes -= PAGE_CACHE_SIZE; > @@ -328,7 +346,7 @@ static int start_read(struct inode *inode, struct > list_head *page_list, int max) > page = list_entry(page_list->prev, struct page, lru); > BUG_ON(PageLocked(page)); > list_del(&page->lru); > - > + > dout("start_read %p adding %p idx %lu\n", inode, page, > page->index); > if (add_to_page_cache_lru(page, &inode->i_data, page->index, > @@ -375,6 +393,12 @@ static int ceph_readpages(struct file *file, struct > address_space *mapping, > int rc = 0; > int max = 0; > > + rc = ceph_readpages_from_fscache(mapping->host, mapping, page_list, > + &nr_pages); > + > + if (rc == 0) > + goto out; > + > if (fsc->mount_options->rsize >= PAGE_CACHE_SIZE) > max = (fsc->mount_options->rsize + PAGE_CACHE_SIZE - 1) > >> PAGE_SHIFT; > @@ -494,6 +518,8 @@ static int writepage_nounlock(struct page *page, struct > writeback_control *wbc) > CONGESTION_ON_THRESH(fsc->mount_options->congestion_kb)) > set_bdi_congested(&fsc->backing_dev_info, BLK_RW_ASYNC); > > + ceph_readpage_to_fscache(inode, page); > + > set_page_writeback(page); > err = ceph_osdc_writepages(osdc, ceph_vino(inode), > &ci->i_layout, snapc, > @@ -549,7 +575,6 @@ static void ceph_release_pages(struct page **pages, int > num) > pagevec_release(&pvec); > } > > - > /* > * async writeback completion handler. > * > diff --git a/fs/ceph/cache.c b/fs/ceph/cache.c > new file mode 100644 > index 0000000..a5ad9c3 > --- /dev/null > +++ b/fs/ceph/cache.c > @@ -0,0 +1,311 @@ > +/* > + * Ceph cache definitions. > + * > + * Copyright (C) 2013 by Adfin Solutions, Inc. All Rights Reserved. > + * Written by Milosz Tanski (mil...@adfin.com) > + * > + * This program is free software; you can redistribute it and/or modify > + * it under the terms of the GNU General Public License version 2 > + * as published by the Free Software Foundation. > + * > + * This program is distributed in the hope that it will be useful, > + * but WITHOUT ANY WARRANTY; without even the implied warranty of > + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the > + * GNU General Public License for more details. > + * > + * You should have received a copy of the GNU General Public License > + * along with this program; if not, write to: > + * Free Software Foundation > + * 51 Franklin Street, Fifth Floor > + * Boston, MA 02111-1301 USA > + * > + */ > + > +#include "super.h" > +#include "cache.h" > + > +struct ceph_aux_inode { > + struct timespec mtime; > + loff_t size; > +}; > + > +struct fscache_netfs ceph_cache_netfs = { > + .name = "ceph", > + .version = 0, > +}; > + > +static uint16_t ceph_fscache_session_get_key(const void *cookie_netfs_data, > + void *buffer, uint16_t maxbuf) > +{ > + const struct ceph_fs_client* fsc = cookie_netfs_data; > + uint16_t klen; > + > + klen = sizeof(fsc->client->fsid); > + if (klen > maxbuf) > + return 0; > + > + memcpy(buffer, &fsc->client->fsid, klen); > + return klen; > +} > + > +static const struct fscache_cookie_def ceph_fscache_fsid_object_def = { > + .name = "CEPH.fsid", > + .type = FSCACHE_COOKIE_TYPE_INDEX, > + .get_key = ceph_fscache_session_get_key, > +}; > + > +void ceph_fscache_register_fsid_cookie(struct ceph_fs_client* fsc) > +{ > + fsc->fscache = fscache_acquire_cookie(ceph_cache_netfs.primary_index, > + &ceph_fscache_fsid_object_def, > + fsc); > +} > + > +void ceph_fscache_unregister_fsid_cookie(struct ceph_fs_client* fsc) > +{ > + fscache_relinquish_cookie(fsc->fscache, 0); > + fsc->fscache = NULL; > +} > + > +static uint16_t ceph_fscache_inode_get_key(const void *cookie_netfs_data, > + void *buffer, uint16_t maxbuf) > +{ > + const struct ceph_inode_info* ci = cookie_netfs_data; > + uint16_t klen; > + > + /* use ceph virtual inode (id + snaphot) */ > + klen = sizeof(ci->i_vino); > + if (klen > maxbuf) > + return 0; > + > + memcpy(buffer, &ci->i_vino, klen); > + return klen; > +} > + > +static uint16_t ceph_fscache_inode_get_aux(const void *cookie_netfs_data, > + void *buffer, uint16_t bufmax) > +{ > + struct ceph_aux_inode aux; > + const struct ceph_inode_info* ci = cookie_netfs_data; > + const struct inode* inode = &ci->vfs_inode; > + > + memset(&aux, 0, sizeof(aux)); > + aux.mtime = inode->i_mtime; > + aux.size = inode->i_size; > + > + memcpy(buffer, &aux, sizeof(aux)); > + > + return sizeof(aux); > +} > + > +static void ceph_fscache_inode_get_attr(const void *cookie_netfs_data, > + uint64_t *size) > +{ > + const struct ceph_inode_info* ci = cookie_netfs_data; > + const struct inode* inode = &ci->vfs_inode; > + > + *size = inode->i_size; > +} > + > +static enum fscache_checkaux ceph_fscache_inode_check_aux( > + void *cookie_netfs_data, const void *data, uint16_t dlen) > +{ > + struct ceph_aux_inode aux; > + struct ceph_inode_info* ci = cookie_netfs_data; > + struct inode* inode = &ci->vfs_inode; > + > + if (dlen != sizeof(aux)) > + return FSCACHE_CHECKAUX_OBSOLETE; > + > + memset(&aux, 0, sizeof(aux)); > + aux.mtime = inode->i_mtime; > + aux.size = inode->i_size; > + > + if (memcmp(data, &aux, sizeof(aux)) != 0) > + return FSCACHE_CHECKAUX_OBSOLETE; > + > + dout("ceph inode 0x%p cached okay", ci); > + return FSCACHE_CHECKAUX_OKAY; > +} > + > +static void ceph_fscache_inode_now_uncached(void* cookie_netfs_data) > +{ > + struct ceph_inode_info* ci = cookie_netfs_data; > + struct pagevec pvec; > + pgoff_t first; > + int loop, nr_pages; > + > + pagevec_init(&pvec, 0); > + first = 0; > + > + dout("ceph inode 0x%p now uncached", ci); > + > + while (1) { > + nr_pages = pagevec_lookup(&pvec, ci->vfs_inode.i_mapping, first, > + PAGEVEC_SIZE - pagevec_count(&pvec)); > + > + if (!nr_pages) > + break; > + > + for (loop = 0; loop < nr_pages; loop++) > + ClearPageFsCache(pvec.pages[loop]); > + > + first = pvec.pages[nr_pages - 1]->index + 1; > + > + pvec.nr = nr_pages; > + pagevec_release(&pvec); > + cond_resched(); > + } > +} > + > +static const struct fscache_cookie_def ceph_fscache_inode_object_def = { > + .name = "CEPH.inode", > + .type = FSCACHE_COOKIE_TYPE_DATAFILE, > + .get_key = ceph_fscache_inode_get_key, > + .get_attr = ceph_fscache_inode_get_attr, > + .get_aux = ceph_fscache_inode_get_aux, > + .check_aux = ceph_fscache_inode_check_aux, > + .now_uncached = ceph_fscache_inode_now_uncached, > +}; > + > +void ceph_fscache_register_inode_cookie(struct ceph_fs_client* fsc, > + struct ceph_inode_info* ci) > +{ > + struct inode* inode = &ci->vfs_inode; > + > + /* No caching for filesystem */ > + if (fsc->fscache == NULL) > + return; > + > + /* Only cache for regular files that are read only */ > + if ((ci->vfs_inode.i_mode & S_IFREG) == 0) > + return; > + > + /* Avoid multiple racing open requests */ > + mutex_lock(&inode->i_mutex); > + > + if (ci->fscache) > + goto done; > + > + ci->fscache = fscache_acquire_cookie(fsc->fscache, > + &ceph_fscache_inode_object_def, > + ci); > +done: > + mutex_unlock(&inode->i_mutex); > + > +} > + > +void ceph_fscache_unregister_inode_cookie(struct ceph_inode_info* ci) > +{ > + struct fscache_cookie* cookie; > + > + if ((cookie = ci->fscache) == NULL) > + return; > + > + ci->fscache = NULL; > + > + fscache_uncache_all_inode_pages(cookie, &ci->vfs_inode); > + fscache_relinquish_cookie(cookie, 0); > +} > + > +static void ceph_vfs_readpage_complete(struct page *page, void *data, int > error) > +{ > + if (!error) > + SetPageUptodate(page); > +} > + > +static void ceph_vfs_readpage_complete_unlock(struct page *page, void *data, > int error) > +{ > + if (!error) > + SetPageUptodate(page); > + > + unlock_page(page); > +} > + > +static inline int cache_valid(struct ceph_inode_info *ci) > +{ > + return ((ceph_caps_issued(ci) & CEPH_CAP_FILE_CACHE) && > + (ci->i_fscache_gen == ci->i_rdcache_gen)); > +} > + > + > +/* Atempt to read from the fscache, > + * > + * This function is called from the readpage_nounlock context. DO NOT > attempt to > + * unlock the page here (or in the callback). > + */ > +int __ceph_readpage_from_fscache(struct inode *inode, struct page *page) > +{ > + struct ceph_inode_info *ci = ceph_inode(inode); > + int ret; > + > + if (!cache_valid(ci)) > + return -ENOBUFS; > + > + ret = fscache_read_or_alloc_page(ci->fscache, page, > + ceph_vfs_readpage_complete, NULL, > + GFP_KERNEL); > + > + switch (ret) { > + case 0: /* Page found */ > + dout("page read submitted\n"); > + return 0; > + case -ENOBUFS: /* Pages were not found, and can't be */ > + case -ENODATA: /* Pages were not found */ > + dout("page/inode not in cache\n"); > + return ret; > + default: > + dout("%s: unknown error ret = %i\n", __func__, ret); > + return ret; > + } > +} > + > +int __ceph_readpages_from_fscache(struct inode *inode, > + struct address_space *mapping, > + struct list_head *pages, > + unsigned *nr_pages) > +{ > + struct ceph_inode_info *ci = ceph_inode(inode); > + int ret; > + > + if (!cache_valid(ci)) > + return -ENOBUFS; > + > + ret = fscache_read_or_alloc_pages(ci->fscache, mapping, pages, nr_pages, > + ceph_vfs_readpage_complete_unlock, > + NULL, mapping_gfp_mask(mapping)); > + > + switch (ret) { > + case 0: /* All pages found */ > + dout("all-page read submitted\n"); > + return 0; > + case -ENOBUFS: /* Some pages were not found, and can't be */ > + case -ENODATA: /* some pages were not found */ > + dout("page/inode not in cache\n"); > + return ret; > + default: > + dout("%s: unknown error ret = %i\n", __func__, ret); > + return ret; > + } > +} > + > +void __ceph_readpage_to_fscache(struct inode *inode, struct page *page) > +{ > + struct ceph_inode_info *ci = ceph_inode(inode); > + int ret; > + > + if (!cache_valid(ci)) > + return; > + > + ret = fscache_write_page(ci->fscache, page, GFP_KERNEL); > + if (ret) > + fscache_uncache_page(ci->fscache, page); > +} > + > +void __ceph_invalidate_fscache_page(struct inode* inode, struct page *page) > +{ > + struct ceph_inode_info *ci = ceph_inode(inode); > + > + fscache_wait_on_page_write(ci->fscache, page); > + fscache_uncache_page(ci->fscache, page); > +} > diff --git a/fs/ceph/cache.h b/fs/ceph/cache.h > new file mode 100644 > index 0000000..23f2666 > --- /dev/null > +++ b/fs/ceph/cache.h > @@ -0,0 +1,123 @@ > +/* > + * Ceph cache definitions. > + * > + * Copyright (C) 2013 by Adfin Solutions, Inc. All Rights Reserved. > + * Written by Milosz Tanski (mil...@adfin.com) > + * > + * This program is free software; you can redistribute it and/or modify > + * it under the terms of the GNU General Public License version 2 > + * as published by the Free Software Foundation. > + * > + * This program is distributed in the hope that it will be useful, > + * but WITHOUT ANY WARRANTY; without even the implied warranty of > + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the > + * GNU General Public License for more details. > + * > + * You should have received a copy of the GNU General Public License > + * along with this program; if not, write to: > + * Free Software Foundation > + * 51 Franklin Street, Fifth Floor > + * Boston, MA 02111-1301 USA > + * > + */ > + > +#ifndef _CEPH_CACHE_H > +#define _CEPH_CACHE_H > + > +#include <linux/fscache.h> > + > + > +extern struct fscache_netfs ceph_cache_netfs; > + > + > +void ceph_fscache_register_fsid_cookie(struct ceph_fs_client* fsc); > +void ceph_fscache_unregister_fsid_cookie(struct ceph_fs_client* fsc); > +void ceph_fscache_register_inode_cookie(struct ceph_fs_client* parent_fsc, > + struct ceph_inode_info* ci); > +void ceph_fscache_unregister_inode_cookie(struct ceph_inode_info* ci); > + > +int __ceph_readpage_from_fscache(struct inode *inode, struct page *page); > +int __ceph_readpages_from_fscache(struct inode *inode, > + struct address_space *mapping, > + struct list_head *pages, > + unsigned *nr_pages); > +void __ceph_readpage_to_fscache(struct inode *inode, struct page *page); > +void __ceph_invalidate_fscache_page(struct inode* inode, struct page *page); These should all move down. The revalidate_work method should get moved in here and into cache.c, too. > + > +#ifdef CONFIG_CEPH_FSCACHE > + > + > +static inline int ceph_readpage_from_fscache(struct inode* inode, > + struct page *page) > +{ > + return __ceph_readpage_from_fscache(inode, page); > +} > + > +static inline int ceph_readpages_from_fscache(struct inode *inode, > + struct address_space *mapping, > + struct list_head *pages, > + unsigned *nr_pages) > +{ > + return __ceph_readpages_from_fscache(inode, mapping, pages, > + nr_pages); > +} > + > +static inline void ceph_readpage_to_fscache(struct inode *inode, > + struct page *page) > +{ > + return __ceph_readpage_to_fscache(inode, page); > +} > + > +static inline void ceph_invalidate_fscache_page(struct inode *inode, > + struct page *page) > +{ > + return __ceph_invalidate_fscache_page(inode, page); > +} > + > +static inline int ceph_release_fscache_page(struct page *page, gfp_t gfp) > +{ > + struct inode* inode = page->mapping->host; > + struct ceph_inode_info *ci = ceph_inode(inode); > + return fscache_maybe_release_page(ci->fscache, page, gfp); > +} > + > +#else > + > +static inline int ceph_readpage_from_fscache(struct inode* inode, > + struct page *page) > +{ > + return -ENOBUFS; > +} > + > +static inline int ceph_readpages_from_fscache(struct inode *inode, > + struct address_space *mapping, > + struct list_head *pages, > + unsigned *nr_pages) > +{ > + return -ENOBUFS; > +} > + > +static inline void ceph_readpage_to_fscache(struct inode *inode, > + struct page *page) > +{ > +} > + > +static inline void ceph_invalidate_fscache_page(struct inode *inode, > + struct page *page) > +{ > +} > + > +static inline int ceph_release_fscache_page(struct page *page, gfp_t gfp) > +{ > + return 1; > +} > + > +static void ceph_fscache_readpages_cancel(struct inode *inode, > + struct list_head *pages) > +{ > + > +} > + > +#endif > + > +#endif > diff --git a/fs/ceph/caps.c b/fs/ceph/caps.c > index 5a26bc1..a94ca4b 100644 > --- a/fs/ceph/caps.c > +++ b/fs/ceph/caps.c > @@ -10,6 +10,7 @@ > > #include "super.h" > #include "mds_client.h" > +#include "cache.h" > #include <linux/ceph/decode.h> > #include <linux/ceph/messenger.h> > > @@ -479,8 +480,9 @@ static void __check_cap_issue(struct ceph_inode_info *ci, > struct ceph_cap *cap, > * i_rdcache_gen. > */ > if ((issued & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) && > - (had & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) == 0) > + (had & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) == 0) { > ci->i_rdcache_gen++; > + } > > /* > * if we are newly issued FILE_SHARED, mark dir not complete; we > @@ -2395,6 +2397,7 @@ static void handle_cap_grant(struct inode *inode, > struct ceph_mds_caps *grant, > int writeback = 0; > int queue_invalidate = 0; > int deleted_inode = 0; > + int queue_revalidate = 0; > > dout("handle_cap_grant inode %p cap %p mds%d seq %d %s\n", > inode, cap, mds, seq, ceph_cap_string(newcaps)); > @@ -2417,6 +2420,8 @@ static void handle_cap_grant(struct inode *inode, > struct ceph_mds_caps *grant, > ci->i_rdcache_revoking = ci->i_rdcache_gen; > } > } > + > + fscache_invalidate(ci->fscache); > } > > /* side effects now are allowed */ > @@ -2458,6 +2463,11 @@ static void handle_cap_grant(struct inode *inode, > struct ceph_mds_caps *grant, > } > } > > + /* Do we need to revalidate our fscache cookie. Don't bother on the > + * first cache cap as we already validate at cookie creation time. */ > + if ((issued & CEPH_CAP_FILE_CACHE) && ci->i_rdcache_gen > 1) > + queue_revalidate = 1; > + > /* size/ctime/mtime/atime? */ > ceph_fill_file_size(inode, issued, > le32_to_cpu(grant->truncate_seq), > @@ -2542,6 +2552,7 @@ static void handle_cap_grant(struct inode *inode, > struct ceph_mds_caps *grant, > BUG_ON(cap->issued & ~cap->implemented); > > spin_unlock(&ci->i_ceph_lock); > + > if (writeback) > /* > * queue inode for writeback: we can't actually call > @@ -2553,6 +2564,8 @@ static void handle_cap_grant(struct inode *inode, > struct ceph_mds_caps *grant, > ceph_queue_invalidate(inode); > if (deleted_inode) > invalidate_aliases(inode); > + if (queue_revalidate) > + ceph_queue_revalidate(inode); > if (wake) > wake_up_all(&ci->i_cap_wq); > > @@ -2709,8 +2722,10 @@ static void handle_cap_trunc(struct inode *inode, > truncate_seq, truncate_size, size); > spin_unlock(&ci->i_ceph_lock); > > - if (queue_trunc) > + if (queue_trunc) { > ceph_queue_vmtruncate(inode); > + fscache_invalidate(ci->fscache); This should call ceph_fscache_invalidate(inode), a wrapper in cache.[ch]. (This is fixed in my patch in the ceph-client.git testing branch.) > + } > } > > /* > diff --git a/fs/ceph/file.c b/fs/ceph/file.c > index 68af489..b81c75f 100644 > --- a/fs/ceph/file.c > +++ b/fs/ceph/file.c > @@ -12,6 +12,7 @@ > > #include "super.h" > #include "mds_client.h" > +#include "cache.h" > > /* > * Ceph file operations > @@ -69,9 +70,23 @@ static int ceph_init_file(struct inode *inode, struct file > *file, int fmode) > { > struct ceph_file_info *cf; > int ret = 0; > + struct ceph_inode_info *ci = ceph_inode(inode); > + struct ceph_fs_client *fsc = ceph_sb_to_client(inode->i_sb); > + struct ceph_mds_client *mdsc = fsc->mdsc; > > switch (inode->i_mode & S_IFMT) { > case S_IFREG: > + /* First file open request creates the cookie, we want to keep > + * this cookie around for the filetime of the inode as not to > + * have to worry about fscache register / revoke / operation > + * races. > + * > + * Also, if we know the operation is going to invalidate data > + * (non readonly) just nuke the cache right away. > + */ > + ceph_fscache_register_inode_cookie(mdsc->fsc, ci); > + if ((fmode & CEPH_FILE_MODE_WR)) > + fscache_invalidate(ci->fscache); > case S_IFDIR: > dout("init_file %p %p 0%o (regular)\n", inode, file, > inode->i_mode); > @@ -182,6 +197,7 @@ int ceph_open(struct inode *inode, struct file *file) > spin_unlock(&ci->i_ceph_lock); > return ceph_init_file(inode, file, fmode); > } > + > spin_unlock(&ci->i_ceph_lock); > > dout("open fmode %d wants %s\n", fmode, ceph_cap_string(wanted)); > @@ -192,6 +208,7 @@ int ceph_open(struct inode *inode, struct file *file) > } > req->r_inode = inode; > ihold(inode); > + > req->r_num_caps = 1; > if (flags & (O_CREAT|O_TRUNC)) > parent_inode = ceph_get_dentry_parent_inode(file->f_dentry); > diff --git a/fs/ceph/inode.c b/fs/ceph/inode.c > index 602ccd8..5daf7f8 100644 > --- a/fs/ceph/inode.c > +++ b/fs/ceph/inode.c > @@ -12,6 +12,7 @@ > > #include "super.h" > #include "mds_client.h" > +#include "cache.h" > #include <linux/ceph/decode.h> > > /* > @@ -31,6 +32,7 @@ static const struct inode_operations ceph_symlink_iops; > static void ceph_invalidate_work(struct work_struct *work); > static void ceph_writeback_work(struct work_struct *work); > static void ceph_vmtruncate_work(struct work_struct *work); > +static void ceph_revalidate_work(struct work_struct *work); This can go in cache.h, without the 'static'... > > /* > * find or create an inode, given the ceph ino number > @@ -386,6 +388,13 @@ struct inode *ceph_alloc_inode(struct super_block *sb) > > INIT_WORK(&ci->i_vmtruncate_work, ceph_vmtruncate_work); > > +#ifdef CONFIG_CEPH_FSCACHE > + ci->fscache = NULL; > + /* The first load is verifed cookie open time */ > + ci->i_fscache_gen = 1; > + INIT_WORK(&ci->i_revalidate_work, ceph_revalidate_work); > +#endif > + > return &ci->vfs_inode; > } > > @@ -405,6 +414,8 @@ void ceph_destroy_inode(struct inode *inode) > > dout("destroy_inode %p ino %llx.%llx\n", inode, ceph_vinop(inode)); > > + ceph_fscache_unregister_inode_cookie(ci); > + > ceph_queue_caps_release(inode); > > /* > @@ -439,7 +450,6 @@ void ceph_destroy_inode(struct inode *inode) > call_rcu(&inode->i_rcu, ceph_i_callback); > } > > - > /* > * Helpers to fill in size, ctime, mtime, and atime. We have to be > * careful because either the client or MDS may have more up to date > @@ -491,6 +501,10 @@ int ceph_fill_file_size(struct inode *inode, int issued, > truncate_size); > ci->i_truncate_size = truncate_size; > } > + > + if (queue_trunc) > + fscache_invalidate(ci->fscache); > + > return queue_trunc; > } > > @@ -1079,7 +1093,7 @@ int ceph_fill_trace(struct super_block *sb, struct > ceph_mds_request *req, > * complete. > */ > ceph_set_dentry_offset(req->r_old_dentry); > - dout("dn %p gets new offset %lld\n", req->r_old_dentry, > + dout("dn %p gets new offset %lld\n", req->r_old_dentry, > ceph_dentry(req->r_old_dentry)->offset); > > dn = req->r_old_dentry; /* use old_dentry */ > @@ -1494,6 +1508,7 @@ void ceph_queue_vmtruncate(struct inode *inode) > struct ceph_inode_info *ci = ceph_inode(inode); > > ihold(inode); > + > if (queue_work(ceph_sb_to_client(inode->i_sb)->trunc_wq, > &ci->i_vmtruncate_work)) { > dout("ceph_queue_vmtruncate %p\n", inode); > @@ -1565,6 +1580,53 @@ retry: > wake_up_all(&ci->i_cap_wq); > } > > +static void ceph_revalidate_work(struct work_struct *work) > +{ > + int issued; > + u32 orig_gen; > + struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info, > + i_revalidate_work); > + struct inode *inode = &ci->vfs_inode; > + > + spin_lock(&ci->i_ceph_lock); > + issued = __ceph_caps_issued(ci, NULL); > + orig_gen = ci->i_rdcache_gen; > + spin_unlock(&ci->i_ceph_lock); > + > + if (!(issued & CEPH_CAP_FILE_CACHE)) { > + dout("revalidate_work lost cache before validation %p\n", > + inode); > + goto out; > + } > + > + if (!fscache_check_consistency(ci->fscache)) > + fscache_invalidate(ci->fscache); > + > + spin_lock(&ci->i_ceph_lock); > + /* Update the new valid generation (backwards sanity check too) */ > + if (orig_gen > ci->i_fscache_gen) { > + ci->i_fscache_gen = orig_gen; > + } > + spin_unlock(&ci->i_ceph_lock); > + > +out: > + iput(&ci->vfs_inode); > +} > + > +void ceph_queue_revalidate(struct inode *inode) > +{ > + struct ceph_inode_info *ci = ceph_inode(inode); > + > + ihold(inode); > + > + if (queue_work(ceph_sb_to_client(inode->i_sb)->revalidate_wq, > + &ci->i_revalidate_work)) { > + dout("ceph_queue_revalidate %p\n", inode); > + } else { > + dout("ceph_queue_revalidate %p failed\n)", inode); > + iput(inode); > + } > +} Move these to cache.c, and put a no-op ceph_queue_revalidate() in cache.h's #else block... > > /* > * symlinks > diff --git a/fs/ceph/super.c b/fs/ceph/super.c > index 6627b26..a56baab 100644 > --- a/fs/ceph/super.c > +++ b/fs/ceph/super.c > @@ -17,6 +17,7 @@ > > #include "super.h" > #include "mds_client.h" > +#include "cache.h" > > #include <linux/ceph/ceph_features.h> > #include <linux/ceph/decode.h> > @@ -142,6 +143,8 @@ enum { > Opt_nodcache, > Opt_ino32, > Opt_noino32, > + Opt_fscache, > + Opt_nofscache > }; > > static match_table_t fsopt_tokens = { > @@ -167,6 +170,8 @@ static match_table_t fsopt_tokens = { > {Opt_nodcache, "nodcache"}, > {Opt_ino32, "ino32"}, > {Opt_noino32, "noino32"}, > + {Opt_fscache, "fsc"}, > + {Opt_nofscache, "nofsc"}, > {-1, NULL} > }; > > @@ -260,6 +265,12 @@ static int parse_fsopt_token(char *c, void *private) > case Opt_noino32: > fsopt->flags &= ~CEPH_MOUNT_OPT_INO32; > break; > + case Opt_fscache: > + fsopt->flags |= CEPH_MOUNT_OPT_FSCACHE; > + break; > + case Opt_nofscache: > + fsopt->flags &= ~CEPH_MOUNT_OPT_FSCACHE; > + break; > default: > BUG_ON(token); > } > @@ -422,6 +433,10 @@ static int ceph_show_options(struct seq_file *m, struct > dentry *root) > seq_puts(m, ",dcache"); > else > seq_puts(m, ",nodcache"); > + if (fsopt->flags & CEPH_MOUNT_OPT_FSCACHE) > + seq_puts(m, ",fsc"); > + else > + seq_puts(m, ",nofsc"); > > if (fsopt->wsize) > seq_printf(m, ",wsize=%d", fsopt->wsize); > @@ -530,11 +545,24 @@ static struct ceph_fs_client *create_fs_client(struct > ceph_mount_options *fsopt, > if (!fsc->wb_pagevec_pool) > goto fail_trunc_wq; > > +#ifdef CONFIG_CEPH_FSCACHE > + if ((fsopt->flags & CEPH_MOUNT_OPT_FSCACHE)) > + ceph_fscache_register_fsid_cookie(fsc); > + > + fsc->revalidate_wq = alloc_workqueue("ceph-revalidate", 0, 1); > + if (fsc->revalidate_wq == NULL) > + goto fail_fscache; > +#endif > + Since this is non-trivial, I'd make ceph_fscache_init() and _shutdown() functions (in cache.[ch]) so the #ifdef's go away here, too. > /* caps */ > fsc->min_caps = fsopt->max_readdir; > > return fsc; > > +#ifdef CONFIG_CEPH_FSCACHE > +fail_fscache: > + ceph_fscache_unregister_fsid_cookie(fsc); > +#endif > fail_trunc_wq: > destroy_workqueue(fsc->trunc_wq); > fail_pg_inv_wq: > @@ -554,6 +582,10 @@ static void destroy_fs_client(struct ceph_fs_client *fsc) > { > dout("destroy_fs_client %p\n", fsc); > > +#ifdef CONFIG_CEPH_FSCACHE > + ceph_fscache_unregister_fsid_cookie(fsc); > +#endif > + and here > destroy_workqueue(fsc->wb_wq); > destroy_workqueue(fsc->pg_inv_wq); > destroy_workqueue(fsc->trunc_wq); > @@ -588,6 +620,8 @@ static void ceph_inode_init_once(void *foo) > > static int __init init_caches(void) > { > + int error = -ENOMEM; > + > ceph_inode_cachep = kmem_cache_create("ceph_inode_info", > sizeof(struct ceph_inode_info), > __alignof__(struct ceph_inode_info), > @@ -611,15 +645,19 @@ static int __init init_caches(void) > if (ceph_file_cachep == NULL) > goto bad_file; > > - return 0; > +#ifdef CONFIG_CEPH_FSCACHE > + if ((error = fscache_register_netfs(&ceph_cache_netfs))) > + goto bad_file; > +#endif ceph_fscache_register() (?) in cache.h? > > + return 0; > bad_file: > kmem_cache_destroy(ceph_dentry_cachep); > bad_dentry: > kmem_cache_destroy(ceph_cap_cachep); > bad_cap: > kmem_cache_destroy(ceph_inode_cachep); > - return -ENOMEM; > + return error; > } > > static void destroy_caches(void) > @@ -629,10 +667,15 @@ static void destroy_caches(void) > * destroy cache. > */ > rcu_barrier(); > + > kmem_cache_destroy(ceph_inode_cachep); > kmem_cache_destroy(ceph_cap_cachep); > kmem_cache_destroy(ceph_dentry_cachep); > kmem_cache_destroy(ceph_file_cachep); > + > +#ifdef CONFIG_CEPH_FSCACHE > + fscache_unregister_netfs(&ceph_cache_netfs); > +#endif and ceph_fscache_unregister() We'd also like to make sure this gets tested by our qa suite. That probably means setting up the fscache stuff on the clients in the teuthology.git/teuthology/tests/kclient.py task. I'd settle for a quick run-down of what steps we should take to do that during mount/umount, though. Thanks, Milosz! sage > } > > > diff --git a/fs/ceph/super.h b/fs/ceph/super.h > index f1e4e47..72eac24 100644 > --- a/fs/ceph/super.h > +++ b/fs/ceph/super.h > @@ -16,6 +16,10 @@ > > #include <linux/ceph/libceph.h> > > +#ifdef CONFIG_CEPH_FSCACHE > +#include <linux/fscache.h> > +#endif > + > /* f_type in struct statfs */ > #define CEPH_SUPER_MAGIC 0x00c36400 > > @@ -29,6 +33,7 @@ > #define CEPH_MOUNT_OPT_NOASYNCREADDIR (1<<7) /* no dcache readdir */ > #define CEPH_MOUNT_OPT_INO32 (1<<8) /* 32 bit inos */ > #define CEPH_MOUNT_OPT_DCACHE (1<<9) /* use dcache for readdir etc > */ > +#define CEPH_MOUNT_OPT_FSCACHE (1<<10) /* use fscache */ > > #define CEPH_MOUNT_OPT_DEFAULT (CEPH_MOUNT_OPT_RBYTES) > > @@ -90,6 +95,11 @@ struct ceph_fs_client { > struct dentry *debugfs_bdi; > struct dentry *debugfs_mdsc, *debugfs_mdsmap; > #endif > + > +#ifdef CONFIG_CEPH_FSCACHE > + struct fscache_cookie *fscache; > + struct workqueue_struct *revalidate_wq; > +#endif > }; > > > @@ -320,6 +330,12 @@ struct ceph_inode_info { > > struct work_struct i_vmtruncate_work; > > +#ifdef CONFIG_CEPH_FSCACHE > + struct fscache_cookie *fscache; > + u32 i_fscache_gen; /* sequence, for delayed fscache validate */ > + struct work_struct i_revalidate_work; > +#endif > + > struct inode vfs_inode; /* at end */ > }; > > @@ -700,6 +716,7 @@ extern void ceph_queue_vmtruncate(struct inode *inode); > > extern void ceph_queue_invalidate(struct inode *inode); > extern void ceph_queue_writeback(struct inode *inode); > +extern void ceph_queue_revalidate(struct inode *inode); > > extern int ceph_do_getattr(struct inode *inode, int mask); > extern int ceph_permission(struct inode *inode, int mask); > -- > 1.8.1.2 > > -- > To unsubscribe from this list: send the line "unsubscribe ceph-devel" in > the body of a message to majord...@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > > -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html