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-rw-r--r--fs/cachefiles/interface.c26
-rw-r--r--fs/cachefiles/internal.h1
-rw-r--r--fs/cachefiles/xattr.c36
-rw-r--r--fs/ceph/Kconfig9
-rw-r--r--fs/ceph/Makefile1
-rw-r--r--fs/ceph/addr.c116
-rw-r--r--fs/ceph/cache.c398
-rw-r--r--fs/ceph/cache.h159
-rw-r--r--fs/ceph/caps.c87
-rw-r--r--fs/ceph/dir.c2
-rw-r--r--fs/ceph/file.c299
-rw-r--r--fs/ceph/inode.c46
-rw-r--r--fs/ceph/ioctl.c12
-rw-r--r--fs/ceph/mds_client.c34
-rw-r--r--fs/ceph/super.c35
-rw-r--r--fs/ceph/super.h17
-rw-r--r--fs/fscache/cookie.c71
-rw-r--r--fs/fscache/internal.h6
-rw-r--r--fs/fscache/page.c71
19 files changed, 1271 insertions, 155 deletions
diff --git a/fs/cachefiles/interface.c b/fs/cachefiles/interface.c
index d4c1206af9fc..43eb5592cdea 100644
--- a/fs/cachefiles/interface.c
+++ b/fs/cachefiles/interface.c
@@ -378,6 +378,31 @@ static void cachefiles_sync_cache(struct fscache_cache *_cache)
}
/*
+ * check if the backing cache is updated to FS-Cache
+ * - called by FS-Cache when evaluates if need to invalidate the cache
+ */
+static bool cachefiles_check_consistency(struct fscache_operation *op)
+{
+ struct cachefiles_object *object;
+ struct cachefiles_cache *cache;
+ const struct cred *saved_cred;
+ int ret;
+
+ _enter("{OBJ%x}", op->object->debug_id);
+
+ object = container_of(op->object, struct cachefiles_object, fscache);
+ cache = container_of(object->fscache.cache,
+ struct cachefiles_cache, cache);
+
+ cachefiles_begin_secure(cache, &saved_cred);
+ ret = cachefiles_check_auxdata(object);
+ cachefiles_end_secure(cache, saved_cred);
+
+ _leave(" = %d", ret);
+ return ret;
+}
+
+/*
* notification the attributes on an object have changed
* - called with reads/writes excluded by FS-Cache
*/
@@ -522,4 +547,5 @@ const struct fscache_cache_ops cachefiles_cache_ops = {
.write_page = cachefiles_write_page,
.uncache_page = cachefiles_uncache_page,
.dissociate_pages = cachefiles_dissociate_pages,
+ .check_consistency = cachefiles_check_consistency,
};
diff --git a/fs/cachefiles/internal.h b/fs/cachefiles/internal.h
index 49382519907a..5349473df1b1 100644
--- a/fs/cachefiles/internal.h
+++ b/fs/cachefiles/internal.h
@@ -235,6 +235,7 @@ extern int cachefiles_set_object_xattr(struct cachefiles_object *object,
struct cachefiles_xattr *auxdata);
extern int cachefiles_update_object_xattr(struct cachefiles_object *object,
struct cachefiles_xattr *auxdata);
+extern int cachefiles_check_auxdata(struct cachefiles_object *object);
extern int cachefiles_check_object_xattr(struct cachefiles_object *object,
struct cachefiles_xattr *auxdata);
extern int cachefiles_remove_object_xattr(struct cachefiles_cache *cache,
diff --git a/fs/cachefiles/xattr.c b/fs/cachefiles/xattr.c
index 2476e5162609..34c88b83e39f 100644
--- a/fs/cachefiles/xattr.c
+++ b/fs/cachefiles/xattr.c
@@ -157,6 +157,42 @@ int cachefiles_update_object_xattr(struct cachefiles_object *object,
}
/*
+ * check the consistency between the backing cache and the FS-Cache cookie
+ */
+int cachefiles_check_auxdata(struct cachefiles_object *object)
+{
+ struct cachefiles_xattr *auxbuf;
+ struct dentry *dentry = object->dentry;
+ unsigned int dlen;
+ int ret;
+
+ ASSERT(dentry);
+ ASSERT(dentry->d_inode);
+ ASSERT(object->fscache.cookie->def->check_aux);
+
+ auxbuf = kmalloc(sizeof(struct cachefiles_xattr) + 512, GFP_KERNEL);
+ if (!auxbuf)
+ return -ENOMEM;
+
+ auxbuf->len = vfs_getxattr(dentry, cachefiles_xattr_cache,
+ &auxbuf->type, 512 + 1);
+ if (auxbuf->len < 1)
+ return -ESTALE;
+
+ if (auxbuf->type != object->fscache.cookie->def->type)
+ return -ESTALE;
+
+ dlen = auxbuf->len - 1;
+ ret = fscache_check_aux(&object->fscache, &auxbuf->data, dlen);
+
+ kfree(auxbuf);
+ if (ret != FSCACHE_CHECKAUX_OKAY)
+ return -ESTALE;
+
+ return 0;
+}
+
+/*
* check the state xattr on a cache file
* - return -ESTALE if the object should be deleted
*/
diff --git a/fs/ceph/Kconfig b/fs/ceph/Kconfig
index 49bc78243db9..ac9a2ef5bb9b 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 bd352125e829..32e30106a2f0 100644
--- a/fs/ceph/Makefile
+++ b/fs/ceph/Makefile
@@ -9,3 +9,4 @@ 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 5318a3b704f6..6df8bd481425 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>
/*
@@ -70,15 +71,16 @@ static int ceph_set_page_dirty(struct page *page)
struct address_space *mapping = page->mapping;
struct inode *inode;
struct ceph_inode_info *ci;
- int undo = 0;
struct ceph_snap_context *snapc;
+ int ret;
if (unlikely(!mapping))
return !TestSetPageDirty(page);
- if (TestSetPageDirty(page)) {
+ if (PageDirty(page)) {
dout("%p set_page_dirty %p idx %lu -- already dirty\n",
mapping->host, page, page->index);
+ BUG_ON(!PagePrivate(page));
return 0;
}
@@ -107,35 +109,19 @@ static int ceph_set_page_dirty(struct page *page)
snapc, snapc->seq, snapc->num_snaps);
spin_unlock(&ci->i_ceph_lock);
- /* now adjust page */
- spin_lock_irq(&mapping->tree_lock);
- if (page->mapping) { /* Race with truncate? */
- WARN_ON_ONCE(!PageUptodate(page));
- account_page_dirtied(page, page->mapping);
- radix_tree_tag_set(&mapping->page_tree,
- page_index(page), PAGECACHE_TAG_DIRTY);
-
- /*
- * Reference snap context in page->private. Also set
- * PagePrivate so that we get invalidatepage callback.
- */
- page->private = (unsigned long)snapc;
- SetPagePrivate(page);
- } else {
- dout("ANON set_page_dirty %p (raced truncate?)\n", page);
- undo = 1;
- }
-
- spin_unlock_irq(&mapping->tree_lock);
-
- if (undo)
- /* whoops, we failed to dirty the page */
- ceph_put_wrbuffer_cap_refs(ci, 1, snapc);
+ /*
+ * Reference snap context in page->private. Also set
+ * PagePrivate so that we get invalidatepage callback.
+ */
+ BUG_ON(PagePrivate(page));
+ page->private = (unsigned long)snapc;
+ SetPagePrivate(page);
- __mark_inode_dirty(mapping->host, I_DIRTY_PAGES);
+ ret = __set_page_dirty_nobuffers(page);
+ WARN_ON(!PageLocked(page));
+ WARN_ON(!page->mapping);
- BUG_ON(!PageDirty(page));
- return 1;
+ return ret;
}
/*
@@ -150,11 +136,19 @@ static void ceph_invalidatepage(struct page *page, unsigned int offset,
struct ceph_inode_info *ci;
struct ceph_snap_context *snapc = page_snap_context(page);
- BUG_ON(!PageLocked(page));
- BUG_ON(!PagePrivate(page));
- BUG_ON(!page->mapping);
-
inode = page->mapping->host;
+ ci = ceph_inode(inode);
+
+ if (offset != 0 || length != PAGE_CACHE_SIZE) {
+ dout("%p invalidatepage %p idx %lu partial dirty page %u~%u\n",
+ inode, page, page->index, offset, length);
+ return;
+ }
+
+ ceph_invalidate_fscache_page(inode, page);
+
+ if (!PagePrivate(page))
+ return;
/*
* We can get non-dirty pages here due to races between
@@ -164,31 +158,28 @@ static void ceph_invalidatepage(struct page *page, unsigned int offset,
if (!PageDirty(page))
pr_err("%p invalidatepage %p page not dirty\n", inode, page);
- if (offset == 0 && length == PAGE_CACHE_SIZE)
- ClearPageChecked(page);
+ ClearPageChecked(page);
- ci = ceph_inode(inode);
- if (offset == 0 && length == PAGE_CACHE_SIZE) {
- dout("%p invalidatepage %p idx %lu full dirty page\n",
- inode, page, page->index);
- ceph_put_wrbuffer_cap_refs(ci, 1, snapc);
- ceph_put_snap_context(snapc);
- page->private = 0;
- ClearPagePrivate(page);
- } else {
- dout("%p invalidatepage %p idx %lu partial dirty page %u(%u)\n",
- inode, page, page->index, offset, length);
- }
+ dout("%p invalidatepage %p idx %lu full dirty page\n",
+ inode, page, page->index);
+
+ ceph_put_wrbuffer_cap_refs(ci, 1, snapc);
+ ceph_put_snap_context(snapc);
+ page->private = 0;
+ 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);
}
/*
@@ -198,11 +189,16 @@ 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,
@@ -220,6 +216,9 @@ 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;
}
@@ -262,6 +261,7 @@ 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;
@@ -331,11 +331,12 @@ 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,
GFP_NOFS)) {
+ ceph_fscache_uncache_page(inode, page);
page_cache_release(page);
dout("start_read %p add_to_page_cache failed %p\n",
inode, page);
@@ -378,6 +379,12 @@ 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;
@@ -392,6 +399,8 @@ static int ceph_readpages(struct file *file, struct address_space *mapping,
BUG_ON(rc == 0);
}
out:
+ ceph_fscache_readpages_cancel(inode, page_list);
+
dout("readpages %p file %p ret %d\n", inode, file, rc);
return rc;
}
@@ -497,6 +506,8 @@ 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,
@@ -552,7 +563,6 @@ 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 000000000000..6bfe65e0b038
--- /dev/null
+++ b/fs/ceph/cache.c
@@ -0,0 +1,398 @@
+/*
+ * Ceph cache definitions.
+ *
+ * Copyright (C) 2013 by Adfin Solutions, Inc. All Rights Reserved.
+ * Written by Milosz Tanski (milosz@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,
+};
+
+int ceph_fscache_register(void)
+{
+ return fscache_register_netfs(&ceph_cache_netfs);
+}
+
+void ceph_fscache_unregister(void)
+{
+ fscache_unregister_netfs(&ceph_cache_netfs);
+}
+
+int ceph_fscache_register_fs(struct ceph_fs_client* fsc)
+{
+ fsc->fscache = fscache_acquire_cookie(ceph_cache_netfs.primary_index,
+ &ceph_fscache_fsid_object_def,
+ fsc);
+
+ if (fsc->fscache == NULL) {
+ pr_err("Unable to resgister fsid: %p fscache cookie", fsc);
+ return 0;
+ }
+
+ fsc->revalidate_wq = alloc_workqueue("ceph-revalidate", 0, 1);
+ if (fsc->revalidate_wq == NULL)
+ return -ENOMEM;
+
+ return 0;
+}
+
+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 (!PageFsCache(page))
+ return;
+
+ 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);
+}
+
+void ceph_fscache_unregister_fs(struct ceph_fs_client* fsc)
+{
+ if (fsc->revalidate_wq)
+ destroy_workqueue(fsc->revalidate_wq);
+
+ fscache_relinquish_cookie(fsc->fscache, 0);
+ fsc->fscache = NULL;
+}
+
+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_fs_client *fsc = ceph_sb_to_client(inode->i_sb);
+ struct ceph_inode_info *ci = ceph_inode(inode);
+
+ if (fsc->revalidate_wq == NULL || ci->fscache == NULL)
+ return;
+
+ 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);
+ }
+}
+
+void ceph_fscache_inode_init(struct ceph_inode_info *ci)
+{
+ 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);
+}
diff --git a/fs/ceph/cache.h b/fs/ceph/cache.h
new file mode 100644
index 000000000000..ba949408a336
--- /dev/null
+++ b/fs/ceph/cache.h
@@ -0,0 +1,159 @@
+/*
+ * Ceph cache definitions.
+ *
+ * Copyright (C) 2013 by Adfin Solutions, Inc. All Rights Reserved.
+ * Written by Milosz Tanski (milosz@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
+
+#ifdef CONFIG_CEPH_FSCACHE
+
+extern struct fscache_netfs ceph_cache_netfs;
+
+int ceph_fscache_register(void);
+void ceph_fscache_unregister(void);
+
+int ceph_fscache_register_fs(struct ceph_fs_client* fsc);
+void ceph_fscache_unregister_fs(struct ceph_fs_client* fsc);
+
+void ceph_fscache_inode_init(struct ceph_inode_info *ci);
+void ceph_fscache_register_inode_cookie(struct ceph_fs_client* 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);
+void ceph_queue_revalidate(struct inode *inode);
+
+static inline void ceph_fscache_invalidate(struct inode *inode)
+{
+ fscache_invalidate(ceph_inode(inode)->fscache);
+}
+
+static inline void ceph_fscache_uncache_page(struct inode *inode,
+ struct page *page)
+{
+ struct ceph_inode_info *ci = ceph_inode(inode);
+ return fscache_uncache_page(ci->fscache, 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);
+}
+
+static inline void ceph_fscache_readpages_cancel(struct inode *inode,
+ struct list_head *pages)
+{
+ struct ceph_inode_info *ci = ceph_inode(inode);
+ return fscache_readpages_cancel(ci->fscache, pages);
+}
+
+#else
+
+static inline int ceph_fscache_register(void)
+{
+ return 0;
+}
+
+static inline void ceph_fscache_unregister(void)
+{
+}
+
+static inline int ceph_fscache_register_fs(struct ceph_fs_client* fsc)
+{
+ return 0;
+}
+
+static inline void ceph_fscache_unregister_fs(struct ceph_fs_client* fsc)
+{
+}
+
+static inline void ceph_fscache_inode_init(struct ceph_inode_info *ci)
+{
+}
+
+static inline void ceph_fscache_register_inode_cookie(struct ceph_fs_client* parent_fsc,
+ struct ceph_inode_info* ci)
+{
+}
+
+static inline void ceph_fscache_uncache_page(struct inode *inode,
+ struct page *pages)
+{
+}
+
+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_fscache_invalidate(struct inode *inode)
+{
+}
+
+static inline void ceph_invalidate_fscache_page(struct inode *inode,
+ struct page *page)
+{
+}
+
+static inline void ceph_fscache_unregister_inode_cookie(struct ceph_inode_info* ci)
+{
+}
+
+static inline int ceph_release_fscache_page(struct page *page, gfp_t gfp)
+{
+ return 1;
+}
+
+static inline void ceph_fscache_readpages_cancel(struct inode *inode,
+ struct list_head *pages)
+{
+}
+
+static inline void ceph_queue_revalidate(struct inode *inode)
+{
+}
+
+#endif
+
+#endif
diff --git a/fs/ceph/caps.c b/fs/ceph/caps.c
index 25442b40c25a..13976c33332e 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
@@ -2072,19 +2074,17 @@ static int try_get_cap_refs(struct ceph_inode_info *ci, int need, int want,
/* finish pending truncate */
while (ci->i_truncate_pending) {
spin_unlock(&ci->i_ceph_lock);
- if (!(need & CEPH_CAP_FILE_WR))
- mutex_lock(&inode->i_mutex);
__ceph_do_pending_vmtruncate(inode);
- if (!(need & CEPH_CAP_FILE_WR))
- mutex_unlock(&inode->i_mutex);
spin_lock(&ci->i_ceph_lock);
}
- if (need & CEPH_CAP_FILE_WR) {
+ have = __ceph_caps_issued(ci, &implemented);
+
+ if (have & 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) {
+ if (endoff > ci->i_requested_max_size) {
*check_max = 1;
ret = 1;
}
@@ -2099,7 +2099,6 @@ static int try_get_cap_refs(struct ceph_inode_info *ci, int need, int want,
goto out;
}
}
- have = __ceph_caps_issued(ci, &implemented);
if ((have & need) == need) {
/*
@@ -2141,14 +2140,17 @@ static void check_max_size(struct inode *inode, loff_t endoff)
/* do we need to explicitly request a larger max_size? */
spin_lock(&ci->i_ceph_lock);
- if ((endoff >= ci->i_max_size ||
- endoff > (inode->i_size << 1)) &&
- endoff > ci->i_wanted_max_size) {
+ if (endoff >= ci->i_max_size && 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;
}
+ /* duplicate ceph_check_caps()'s logic */
+ if (ci->i_auth_cap &&
+ (ci->i_auth_cap->issued & CEPH_CAP_FILE_WR) &&
+ ci->i_wanted_max_size > ci->i_max_size &&
+ ci->i_wanted_max_size > ci->i_requested_max_size)
+ check = 1;
spin_unlock(&ci->i_ceph_lock);
if (check)
ceph_check_caps(ci, CHECK_CAPS_AUTHONLY, NULL);
@@ -2334,6 +2336,38 @@ void ceph_put_wrbuffer_cap_refs(struct ceph_inode_info *ci, int nr,
}
/*
+ * Invalidate unlinked inode's aliases, so we can drop the inode ASAP.
+ */
+static void invalidate_aliases(struct inode *inode)
+{
+ struct dentry *dn, *prev = NULL;
+
+ dout("invalidate_aliases inode %p\n", inode);
+ d_prune_aliases(inode);
+ /*
+ * For non-directory inode, d_find_alias() only returns
+ * connected dentry. After calling d_invalidate(), the
+ * dentry become disconnected.
+ *
+ * For directory inode, d_find_alias() can return
+ * disconnected dentry. But directory inode should have
+ * one alias at most.
+ */
+ while ((dn = d_find_alias(inode))) {
+ if (dn == prev) {
+ dput(dn);
+ break;
+ }
+ d_invalidate(dn);
+ if (prev)
+ dput(prev);
+ prev = dn;
+ }
+ if (prev)
+ dput(prev);
+}
+
+/*
* Handle a cap GRANT message from the MDS. (Note that a GRANT may
* actually be a revocation if it specifies a smaller cap set.)
*
@@ -2361,8 +2395,9 @@ static void handle_cap_grant(struct inode *inode, struct ceph_mds_caps *grant,
int check_caps = 0;
int wake = 0;
int writeback = 0;
- int revoked_rdcache = 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));
@@ -2377,9 +2412,7 @@ static void handle_cap_grant(struct inode *inode, struct ceph_mds_caps *grant,
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 {
+ if (try_nonblocking_invalidate(inode)) {
/* there were locked pages.. invalidate later
in a separate thread. */
if (ci->i_rdcache_revoking != ci->i_rdcache_gen) {
@@ -2387,6 +2420,8 @@ static void handle_cap_grant(struct inode *inode, struct ceph_mds_caps *grant,
ci->i_rdcache_revoking = ci->i_rdcache_gen;
}
}
+
+ ceph_fscache_invalidate(inode);
}
/* side effects now are allowed */
@@ -2407,8 +2442,12 @@ static void handle_cap_grant(struct inode *inode, struct ceph_mds_caps *grant,
from_kgid(&init_user_ns, inode->i_gid));
}
- if ((issued & CEPH_CAP_LINK_EXCL) == 0)
+ if ((issued & CEPH_CAP_LINK_EXCL) == 0) {
set_nlink(inode, le32_to_cpu(grant->nlink));
+ if (inode->i_nlink == 0 &&
+ (newcaps & (CEPH_CAP_LINK_SHARED | CEPH_CAP_LINK_EXCL)))
+ deleted_inode = 1;
+ }
if ((issued & CEPH_CAP_XATTR_EXCL) == 0 && grant->xattr_len) {
int len = le32_to_cpu(grant->xattr_len);
@@ -2424,6 +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),
@@ -2508,6 +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
@@ -2517,6 +2562,10 @@ static void handle_cap_grant(struct inode *inode, struct ceph_mds_caps *grant,
ceph_queue_writeback(inode);
if (queue_invalidate)
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);
@@ -2673,8 +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);
+ ceph_fscache_invalidate(inode);
+ }
}
/*
diff --git a/fs/ceph/dir.c b/fs/ceph/dir.c
index a40ceda47a32..868b61d56cac 100644
--- a/fs/ceph/dir.c
+++ b/fs/ceph/dir.c
@@ -793,6 +793,8 @@ static int ceph_link(struct dentry *old_dentry, struct inode *dir,
req->r_locked_dir = dir;
req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
+ /* release LINK_SHARED on source inode (mds will lock it) */
+ req->r_old_inode_drop = CEPH_CAP_LINK_SHARED;
err = ceph_mdsc_do_request(mdsc, dir, req);
if (err) {
d_drop(dentry);
diff --git a/fs/ceph/file.c b/fs/ceph/file.c
index 2ddf061c1c4a..3de89829e2a1 100644
--- a/fs/ceph/file.c
+++ b/fs/ceph/file.c
@@ -8,9 +8,11 @@
#include <linux/namei.h>
#include <linux/writeback.h>
#include <linux/aio.h>
+#include <linux/falloc.h>
#include "super.h"
#include "mds_client.h"
+#include "cache.h"
/*
* Ceph file operations
@@ -68,9 +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))
+ ceph_fscache_invalidate(inode);
case S_IFDIR:
dout("init_file %p %p 0%o (regular)\n", inode, file,
inode->i_mode);
@@ -181,6 +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));
@@ -191,6 +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);
@@ -313,9 +331,9 @@ static int striped_read(struct inode *inode,
{
struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
struct ceph_inode_info *ci = ceph_inode(inode);
- u64 pos, this_len;
+ u64 pos, this_len, left;
int io_align, page_align;
- int left, pages_left;
+ int pages_left;
int read;
struct page **page_pos;
int ret;
@@ -346,47 +364,40 @@ more:
ret = 0;
hit_stripe = this_len < left;
was_short = ret >= 0 && ret < this_len;
- dout("striped_read %llu~%u (read %u) got %d%s%s\n", pos, left, read,
+ dout("striped_read %llu~%llu (read %u) got %d%s%s\n", pos, left, read,
ret, hit_stripe ? " HITSTRIPE" : "", was_short ? " SHORT" : "");
- if (ret > 0) {
- int didpages = (page_align + ret) >> PAGE_CACHE_SHIFT;
-
- if (read < pos - off) {
- dout(" zero gap %llu to %llu\n", off + read, pos);
- ceph_zero_page_vector_range(page_align + read,
- pos - off - read, pages);
+ if (ret >= 0) {
+ int didpages;
+ if (was_short && (pos + ret < inode->i_size)) {
+ u64 tmp = min(this_len - ret,
+ inode->i_size - pos - ret);
+ dout(" zero gap %llu to %llu\n",
+ pos + ret, pos + ret + tmp);
+ ceph_zero_page_vector_range(page_align + read + ret,
+ tmp, pages);
+ ret += tmp;
}
+
+ didpages = (page_align + ret) >> PAGE_CACHE_SHIFT;
pos += ret;
read = pos - off;
left -= ret;
page_pos += didpages;
pages_left -= didpages;
- /* hit stripe? */
- if (left && hit_stripe)
+ /* hit stripe and need continue*/
+ if (left && hit_stripe && pos < inode->i_size)
goto more;
}
- if (was_short) {
+ if (read > 0) {
+ ret = read;
/* did we bounce off eof? */
if (pos + left > inode->i_size)
*checkeof = 1;
-
- /* zero trailing bytes (inside i_size) */
- if (left > 0 && pos < inode->i_size) {
- if (pos + left > inode->i_size)
- left = inode->i_size - pos;
-
- dout("zero tail %d\n", left);
- ceph_zero_page_vector_range(page_align + read, left,
- pages);
- read += left;
- }
}
- if (ret >= 0)
- ret = read;
dout("striped_read returns %d\n", ret);
return ret;
}
@@ -618,6 +629,8 @@ out:
if (check_caps)
ceph_check_caps(ceph_inode(inode), CHECK_CAPS_AUTHONLY,
NULL);
+ } else if (ret != -EOLDSNAPC && written > 0) {
+ ret = written;
}
return ret;
}
@@ -659,7 +672,6 @@ again:
if ((got & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) == 0 ||
(iocb->ki_filp->f_flags & O_DIRECT) ||
- (inode->i_sb->s_flags & MS_SYNCHRONOUS) ||
(fi->flags & CEPH_F_SYNC))
/* hmm, this isn't really async... */
ret = ceph_sync_read(filp, base, len, ppos, &checkeof);
@@ -711,13 +723,11 @@ static ssize_t ceph_aio_write(struct kiocb *iocb, const struct iovec *iov,
&ceph_sb_to_client(inode->i_sb)->client->osdc;
ssize_t count, written = 0;
int err, want, got;
- bool hold_mutex;
if (ceph_snap(inode) != CEPH_NOSNAP)
return -EROFS;
mutex_lock(&inode->i_mutex);
- hold_mutex = true;
err = generic_segment_checks(iov, &nr_segs, &count, VERIFY_READ);
if (err)
@@ -763,18 +773,31 @@ retry_snap:
if ((got & (CEPH_CAP_FILE_BUFFER|CEPH_CAP_FILE_LAZYIO)) == 0 ||
(iocb->ki_filp->f_flags & O_DIRECT) ||
- (inode->i_sb->s_flags & MS_SYNCHRONOUS) ||
(fi->flags & CEPH_F_SYNC)) {
mutex_unlock(&inode->i_mutex);
written = ceph_sync_write(file, iov->iov_base, count,
pos, &iocb->ki_pos);
+ if (written == -EOLDSNAPC) {
+ dout("aio_write %p %llx.%llx %llu~%u"
+ "got EOLDSNAPC, retrying\n",
+ inode, ceph_vinop(inode),
+ pos, (unsigned)iov->iov_len);
+ mutex_lock(&inode->i_mutex);
+ goto retry_snap;
+ }
} else {
+ /*
+ * No need to acquire the i_truncate_mutex. Because
+ * the MDS revokes Fwb caps before sending truncate
+ * message to us. We can't get Fwb cap while there
+ * are pending vmtruncate. So write and vmtruncate
+ * can not run at the same time
+ */
written = generic_file_buffered_write(iocb, iov, nr_segs,
pos, &iocb->ki_pos,
count, 0);
mutex_unlock(&inode->i_mutex);
}
- hold_mutex = false;
if (written >= 0) {
int dirty;
@@ -798,18 +821,12 @@ retry_snap:
written = err;
}
- if (written == -EOLDSNAPC) {
- dout("aio_write %p %llx.%llx %llu~%u got EOLDSNAPC, retrying\n",
- inode, ceph_vinop(inode), pos, (unsigned)iov->iov_len);
- mutex_lock(&inode->i_mutex);
- hold_mutex = true;
- goto retry_snap;
- }
+ goto out_unlocked;
+
out:
- if (hold_mutex)
- mutex_unlock(&inode->i_mutex);
+ mutex_unlock(&inode->i_mutex);
+out_unlocked:
current->backing_dev_info = NULL;
-
return written ? written : err;
}
@@ -822,7 +839,6 @@ static loff_t ceph_llseek(struct file *file, loff_t offset, int whence)
int ret;
mutex_lock(&inode->i_mutex);
- __ceph_do_pending_vmtruncate(inode);
if (whence == SEEK_END || whence == SEEK_DATA || whence == SEEK_HOLE) {
ret = ceph_do_getattr(inode, CEPH_STAT_CAP_SIZE);
@@ -871,6 +887,204 @@ out:
return offset;
}
+static inline void ceph_zero_partial_page(
+ struct inode *inode, loff_t offset, unsigned size)
+{
+ struct page *page;
+ pgoff_t index = offset >> PAGE_CACHE_SHIFT;
+
+ page = find_lock_page(inode->i_mapping, index);
+ if (page) {
+ wait_on_page_writeback(page);
+ zero_user(page, offset & (PAGE_CACHE_SIZE - 1), size);
+ unlock_page(page);
+ page_cache_release(page);
+ }
+}
+
+static void ceph_zero_pagecache_range(struct inode *inode, loff_t offset,
+ loff_t length)
+{
+ loff_t nearly = round_up(offset, PAGE_CACHE_SIZE);
+ if (offset < nearly) {
+ loff_t size = nearly - offset;
+ if (length < size)
+ size = length;
+ ceph_zero_partial_page(inode, offset, size);
+ offset += size;
+ length -= size;
+ }
+ if (length >= PAGE_CACHE_SIZE) {
+ loff_t size = round_down(length, PAGE_CACHE_SIZE);
+ truncate_pagecache_range(inode, offset, offset + size - 1);
+ offset += size;
+ length -= size;
+ }
+ if (length)
+ ceph_zero_partial_page(inode, offset, length);
+}
+
+static int ceph_zero_partial_object(struct inode *inode,
+ loff_t offset, loff_t *length)
+{
+ struct ceph_inode_info *ci = ceph_inode(inode);
+ struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
+ struct ceph_osd_request *req;
+ int ret = 0;
+ loff_t zero = 0;
+ int op;
+
+ if (!length) {
+ op = offset ? CEPH_OSD_OP_DELETE : CEPH_OSD_OP_TRUNCATE;
+ length = &zero;
+ } else {
+ op = CEPH_OSD_OP_ZERO;
+ }
+
+ req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,
+ ceph_vino(inode),
+ offset, length,
+ 1, op,
+ CEPH_OSD_FLAG_WRITE |
+ CEPH_OSD_FLAG_ONDISK,
+ NULL, 0, 0, false);
+ if (IS_ERR(req)) {
+ ret = PTR_ERR(req);
+ goto out;
+ }
+
+ ceph_osdc_build_request(req, offset, NULL, ceph_vino(inode).snap,
+ &inode->i_mtime);
+
+ ret = ceph_osdc_start_request(&fsc->client->osdc, req, false);
+ if (!ret) {
+ ret = ceph_osdc_wait_request(&fsc->client->osdc, req);
+ if (ret == -ENOENT)
+ ret = 0;
+ }
+ ceph_osdc_put_request(req);
+
+out:
+ return ret;
+}
+
+static int ceph_zero_objects(struct inode *inode, loff_t offset, loff_t length)
+{
+ int ret = 0;
+ struct ceph_inode_info *ci = ceph_inode(inode);
+ s32 stripe_unit = ceph_file_layout_su(ci->i_layout);
+ s32 stripe_count = ceph_file_layout_stripe_count(ci->i_layout);
+ s32 object_size = ceph_file_layout_object_size(ci->i_layout);
+ u64 object_set_size = object_size * stripe_count;
+ u64 nearly, t;
+
+ /* round offset up to next period boundary */
+ nearly = offset + object_set_size - 1;
+ t = nearly;
+ nearly -= do_div(t, object_set_size);
+
+ while (length && offset < nearly) {
+ loff_t size = length;
+ ret = ceph_zero_partial_object(inode, offset, &size);
+ if (ret < 0)
+ return ret;
+ offset += size;
+ length -= size;
+ }
+ while (length >= object_set_size) {
+ int i;
+ loff_t pos = offset;
+ for (i = 0; i < stripe_count; ++i) {
+ ret = ceph_zero_partial_object(inode, pos, NULL);
+ if (ret < 0)
+ return ret;
+ pos += stripe_unit;
+ }
+ offset += object_set_size;
+ length -= object_set_size;
+ }
+ while (length) {
+ loff_t size = length;
+ ret = ceph_zero_partial_object(inode, offset, &size);
+ if (ret < 0)
+ return ret;
+ offset += size;
+ length -= size;
+ }
+ return ret;
+}
+
+static long ceph_fallocate(struct file *file, int mode,
+ loff_t offset, loff_t length)
+{
+ struct ceph_file_info *fi = file->private_data;
+ struct inode *inode = file->f_dentry->d_inode;
+ struct ceph_inode_info *ci = ceph_inode(inode);
+ struct ceph_osd_client *osdc =
+ &ceph_inode_to_client(inode)->client->osdc;
+ int want, got = 0;
+ int dirty;
+ int ret = 0;
+ loff_t endoff = 0;
+ loff_t size;
+
+ if (!S_ISREG(inode->i_mode))
+ return -EOPNOTSUPP;
+
+ if (IS_SWAPFILE(inode))
+ return -ETXTBSY;
+
+ mutex_lock(&inode->i_mutex);
+
+ if (ceph_snap(inode) != CEPH_NOSNAP) {
+ ret = -EROFS;
+ goto unlock;
+ }
+
+ if (ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_FULL) &&
+ !(mode & FALLOC_FL_PUNCH_HOLE)) {
+ ret = -ENOSPC;
+ goto unlock;
+ }
+
+ size = i_size_read(inode);
+ if (!(mode & FALLOC_FL_KEEP_SIZE))
+ endoff = offset + length;
+
+ if (fi->fmode & CEPH_FILE_MODE_LAZY)
+ want = CEPH_CAP_FILE_BUFFER | CEPH_CAP_FILE_LAZYIO;
+ else
+ want = CEPH_CAP_FILE_BUFFER;
+
+ ret = ceph_get_caps(ci, CEPH_CAP_FILE_WR, want, &got, endoff);
+ if (ret < 0)
+ goto unlock;
+
+ if (mode & FALLOC_FL_PUNCH_HOLE) {
+ if (offset < size)
+ ceph_zero_pagecache_range(inode, offset, length);
+ ret = ceph_zero_objects(inode, offset, length);
+ } else if (endoff > size) {
+ truncate_pagecache_range(inode, size, -1);
+ if (ceph_inode_set_size(inode, endoff))
+ ceph_check_caps(ceph_inode(inode),
+ CHECK_CAPS_AUTHONLY, NULL);
+ }
+
+ if (!ret) {
+ spin_lock(&ci->i_ceph_lock);
+ dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR);
+ spin_unlock(&ci->i_ceph_lock);
+ if (dirty)
+ __mark_inode_dirty(inode, dirty);
+ }
+
+ ceph_put_cap_refs(ci, got);
+unlock:
+ mutex_unlock(&inode->i_mutex);
+ return ret;
+}
+
const struct file_operations ceph_file_fops = {
.open = ceph_open,
.release = ceph_release,
@@ -887,5 +1101,6 @@ const struct file_operations ceph_file_fops = {
.splice_write = generic_file_splice_write,
.unlocked_ioctl = ceph_ioctl,
.compat_ioctl = ceph_ioctl,
+ .fallocate = ceph_fallocate,
};
diff --git a/fs/ceph/inode.c b/fs/ceph/inode.c
index f3a2abf28a77..8549a48115f7 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>
/*
@@ -344,6 +345,7 @@ struct inode *ceph_alloc_inode(struct super_block *sb)
for (i = 0; i < CEPH_FILE_MODE_NUM; i++)
ci->i_nr_by_mode[i] = 0;
+ mutex_init(&ci->i_truncate_mutex);
ci->i_truncate_seq = 0;
ci->i_truncate_size = 0;
ci->i_truncate_pending = 0;
@@ -377,6 +379,8 @@ struct inode *ceph_alloc_inode(struct super_block *sb)
INIT_WORK(&ci->i_vmtruncate_work, ceph_vmtruncate_work);
+ ceph_fscache_inode_init(ci);
+
return &ci->vfs_inode;
}
@@ -396,6 +400,8 @@ 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);
/*
@@ -430,7 +436,6 @@ 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
@@ -455,16 +460,20 @@ int ceph_fill_file_size(struct inode *inode, int issued,
dout("truncate_seq %u -> %u\n",
ci->i_truncate_seq, truncate_seq);
ci->i_truncate_seq = truncate_seq;
+
+ /* the MDS should have revoked these caps */
+ WARN_ON_ONCE(issued & (CEPH_CAP_FILE_EXCL |
+ CEPH_CAP_FILE_RD |
+ CEPH_CAP_FILE_WR |
+ CEPH_CAP_FILE_LAZYIO));
/*
* If we hold relevant caps, or in the case where we're
* not the only client referencing this file and we
* don't hold those caps, then we need to check whether
* the file is either opened or mmaped
*/
- if ((issued & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_RD|
- CEPH_CAP_FILE_WR|CEPH_CAP_FILE_BUFFER|
- CEPH_CAP_FILE_EXCL|
- CEPH_CAP_FILE_LAZYIO)) ||
+ if ((issued & (CEPH_CAP_FILE_CACHE|
+ CEPH_CAP_FILE_BUFFER)) ||
mapping_mapped(inode->i_mapping) ||
__ceph_caps_file_wanted(ci)) {
ci->i_truncate_pending++;
@@ -478,6 +487,10 @@ int ceph_fill_file_size(struct inode *inode, int issued,
truncate_size);
ci->i_truncate_size = truncate_size;
}
+
+ if (queue_trunc)
+ ceph_fscache_invalidate(inode);
+
return queue_trunc;
}
@@ -1066,7 +1079,7 @@ 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 */
@@ -1419,18 +1432,20 @@ static void ceph_invalidate_work(struct work_struct *work)
u32 orig_gen;
int check = 0;
+ mutex_lock(&ci->i_truncate_mutex);
spin_lock(&ci->i_ceph_lock);
dout("invalidate_pages %p gen %d revoking %d\n", inode,
ci->i_rdcache_gen, ci->i_rdcache_revoking);
if (ci->i_rdcache_revoking != ci->i_rdcache_gen) {
/* nevermind! */
spin_unlock(&ci->i_ceph_lock);
+ mutex_unlock(&ci->i_truncate_mutex);
goto out;
}
orig_gen = ci->i_rdcache_gen;
spin_unlock(&ci->i_ceph_lock);
- truncate_inode_pages(&inode->i_data, 0);
+ truncate_inode_pages(inode->i_mapping, 0);
spin_lock(&ci->i_ceph_lock);
if (orig_gen == ci->i_rdcache_gen &&
@@ -1445,6 +1460,7 @@ static void ceph_invalidate_work(struct work_struct *work)
ci->i_rdcache_revoking);
}
spin_unlock(&ci->i_ceph_lock);
+ mutex_unlock(&ci->i_truncate_mutex);
if (check)
ceph_check_caps(ci, 0, NULL);
@@ -1465,9 +1481,7 @@ static void ceph_vmtruncate_work(struct work_struct *work)
struct inode *inode = &ci->vfs_inode;
dout("vmtruncate_work %p\n", inode);
- mutex_lock(&inode->i_mutex);
__ceph_do_pending_vmtruncate(inode);
- mutex_unlock(&inode->i_mutex);
iput(inode);
}
@@ -1480,6 +1494,7 @@ 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);
@@ -1500,11 +1515,13 @@ void __ceph_do_pending_vmtruncate(struct inode *inode)
u64 to;
int wrbuffer_refs, finish = 0;
+ mutex_lock(&ci->i_truncate_mutex);
retry:
spin_lock(&ci->i_ceph_lock);
if (ci->i_truncate_pending == 0) {
dout("__do_pending_vmtruncate %p none pending\n", inode);
spin_unlock(&ci->i_ceph_lock);
+ mutex_unlock(&ci->i_truncate_mutex);
return;
}
@@ -1521,6 +1538,9 @@ retry:
goto retry;
}
+ /* there should be no reader or writer */
+ WARN_ON_ONCE(ci->i_rd_ref || ci->i_wr_ref);
+
to = ci->i_truncate_size;
wrbuffer_refs = ci->i_wrbuffer_ref;
dout("__do_pending_vmtruncate %p (%d) to %lld\n", inode,
@@ -1538,13 +1558,14 @@ retry:
if (!finish)
goto retry;
+ mutex_unlock(&ci->i_truncate_mutex);
+
if (wrbuffer_refs == 0)
ceph_check_caps(ci, CHECK_CAPS_AUTHONLY, NULL);
wake_up_all(&ci->i_cap_wq);
}
-
/*
* symlinks
*/
@@ -1586,8 +1607,6 @@ int ceph_setattr(struct dentry *dentry, struct iattr *attr)
if (ceph_snap(inode) != CEPH_NOSNAP)
return -EROFS;
- __ceph_do_pending_vmtruncate(inode);
-
err = inode_change_ok(inode, attr);
if (err != 0)
return err;
@@ -1768,7 +1787,8 @@ int ceph_setattr(struct dentry *dentry, struct iattr *attr)
ceph_cap_string(dirtied), mask);
ceph_mdsc_put_request(req);
- __ceph_do_pending_vmtruncate(inode);
+ if (mask & CEPH_SETATTR_SIZE)
+ __ceph_do_pending_vmtruncate(inode);
return err;
out:
spin_unlock(&ci->i_ceph_lock);
diff --git a/fs/ceph/ioctl.c b/fs/ceph/ioctl.c
index e0b4ef31d3c8..669622fd1ae3 100644
--- a/fs/ceph/ioctl.c
+++ b/fs/ceph/ioctl.c
@@ -196,8 +196,10 @@ static long ceph_ioctl_get_dataloc(struct file *file, void __user *arg)
r = ceph_calc_file_object_mapping(&ci->i_layout, dl.file_offset, len,
&dl.object_no, &dl.object_offset,
&olen);
- if (r < 0)
+ if (r < 0) {
+ up_read(&osdc->map_sem);
return -EIO;
+ }
dl.file_offset -= dl.object_offset;
dl.object_size = ceph_file_layout_object_size(ci->i_layout);
dl.block_size = ceph_file_layout_su(ci->i_layout);
@@ -209,8 +211,12 @@ static long ceph_ioctl_get_dataloc(struct file *file, void __user *arg)
snprintf(dl.object_name, sizeof(dl.object_name), "%llx.%08llx",
ceph_ino(inode), dl.object_no);
- ceph_calc_ceph_pg(&pgid, dl.object_name, osdc->osdmap,
- ceph_file_layout_pg_pool(ci->i_layout));
+ r = ceph_calc_ceph_pg(&pgid, dl.object_name, osdc->osdmap,
+ ceph_file_layout_pg_pool(ci->i_layout));
+ if (r < 0) {
+ up_read(&osdc->map_sem);
+ return r;
+ }
dl.osd = ceph_calc_pg_primary(osdc->osdmap, pgid);
if (dl.osd >= 0) {
diff --git a/fs/ceph/mds_client.c b/fs/ceph/mds_client.c
index 187bf214444d..b7bda5d9611d 100644
--- a/fs/ceph/mds_client.c
+++ b/fs/ceph/mds_client.c
@@ -414,6 +414,9 @@ static struct ceph_mds_session *register_session(struct ceph_mds_client *mdsc,
{
struct ceph_mds_session *s;
+ if (mds >= mdsc->mdsmap->m_max_mds)
+ return ERR_PTR(-EINVAL);
+
s = kzalloc(sizeof(*s), GFP_NOFS);
if (!s)
return ERR_PTR(-ENOMEM);
@@ -1028,6 +1031,37 @@ static void remove_session_caps(struct ceph_mds_session *session)
{
dout("remove_session_caps on %p\n", session);
iterate_session_caps(session, remove_session_caps_cb, NULL);
+
+ spin_lock(&session->s_cap_lock);
+ if (session->s_nr_caps > 0) {
+ struct super_block *sb = session->s_mdsc->fsc->sb;
+ struct inode *inode;
+ struct ceph_cap *cap, *prev = NULL;
+ struct ceph_vino vino;
+ /*
+ * iterate_session_caps() skips inodes that are being
+ * deleted, we need to wait until deletions are complete.
+ * __wait_on_freeing_inode() is designed for the job,
+ * but it is not exported, so use lookup inode function
+ * to access it.
+ */
+ while (!list_empty(&session->s_caps)) {
+ cap = list_entry(session->s_caps.next,
+ struct ceph_cap, session_caps);
+ if (cap == prev)
+ break;
+ prev = cap;
+ vino = cap->ci->i_vino;
+ spin_unlock(&session->s_cap_lock);
+
+ inode = ceph_find_inode(sb, vino);
+ iput(inode);
+
+ spin_lock(&session->s_cap_lock);
+ }
+ }
+ spin_unlock(&session->s_cap_lock);
+
BUG_ON(session->s_nr_caps > 0);
BUG_ON(!list_empty(&session->s_cap_flushing));
cleanup_cap_releases(session);
diff --git a/fs/ceph/super.c b/fs/ceph/super.c
index 6627b26a800c..6a0951e43044 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 +545,18 @@ static struct ceph_fs_client *create_fs_client(struct ceph_mount_options *fsopt,
if (!fsc->wb_pagevec_pool)
goto fail_trunc_wq;
+ /* setup fscache */
+ if ((fsopt->flags & CEPH_MOUNT_OPT_FSCACHE) &&
+ (ceph_fscache_register_fs(fsc) != 0))
+ goto fail_fscache;
+
/* caps */
fsc->min_caps = fsopt->max_readdir;
return fsc;
+fail_fscache:
+ ceph_fscache_unregister_fs(fsc);
fail_trunc_wq:
destroy_workqueue(fsc->trunc_wq);
fail_pg_inv_wq:
@@ -554,6 +576,8 @@ static void destroy_fs_client(struct ceph_fs_client *fsc)
{
dout("destroy_fs_client %p\n", fsc);
+ ceph_fscache_unregister_fs(fsc);
+
destroy_workqueue(fsc->wb_wq);
destroy_workqueue(fsc->pg_inv_wq);
destroy_workqueue(fsc->trunc_wq);
@@ -588,6 +612,8 @@ 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 +637,17 @@ static int __init init_caches(void)
if (ceph_file_cachep == NULL)
goto bad_file;
- return 0;
+ if ((error = ceph_fscache_register()))
+ goto bad_file;
+ 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 +657,13 @@ 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);
+
+ ceph_fscache_unregister();
}
diff --git a/fs/ceph/super.h b/fs/ceph/super.h
index cbded572345e..6014b0a3c405 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
};
@@ -288,6 +298,7 @@ struct ceph_inode_info {
int i_nr_by_mode[CEPH_FILE_MODE_NUM]; /* open file counts */
+ struct mutex i_truncate_mutex;
u32 i_truncate_seq; /* last truncate to smaller size */
u64 i_truncate_size; /* and the size we last truncated down to */
int i_truncate_pending; /* still need to call vmtruncate */
@@ -319,6 +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 */
};
diff --git a/fs/fscache/cookie.c b/fs/fscache/cookie.c
index 0e91a3c9fdb2..318e8433527c 100644
--- a/fs/fscache/cookie.c
+++ b/fs/fscache/cookie.c
@@ -558,3 +558,74 @@ void __fscache_cookie_put(struct fscache_cookie *cookie)
_leave("");
}
+
+/*
+ * check the consistency between the netfs inode and the backing cache
+ *
+ * NOTE: it only serves no-index type
+ */
+int __fscache_check_consistency(struct fscache_cookie *cookie)
+{
+ struct fscache_operation *op;
+ struct fscache_object *object;
+ int ret;
+
+ _enter("%p,", cookie);
+
+ ASSERTCMP(cookie->def->type, ==, FSCACHE_COOKIE_TYPE_DATAFILE);
+
+ if (fscache_wait_for_deferred_lookup(cookie) < 0)
+ return -ERESTARTSYS;
+
+ if (hlist_empty(&cookie->backing_objects))
+ return 0;
+
+ op = kzalloc(sizeof(*op), GFP_NOIO | __GFP_NOMEMALLOC | __GFP_NORETRY);
+ if (!op)
+ return -ENOMEM;
+
+ fscache_operation_init(op, NULL, NULL);
+ op->flags = FSCACHE_OP_MYTHREAD |
+ (1 << FSCACHE_OP_WAITING);
+
+ spin_lock(&cookie->lock);
+
+ if (hlist_empty(&cookie->backing_objects))
+ goto inconsistent;
+ object = hlist_entry(cookie->backing_objects.first,
+ struct fscache_object, cookie_link);
+ if (test_bit(FSCACHE_IOERROR, &object->cache->flags))
+ goto inconsistent;
+
+ op->debug_id = atomic_inc_return(&fscache_op_debug_id);
+
+ atomic_inc(&cookie->n_active);
+ if (fscache_submit_op(object, op) < 0)
+ goto submit_failed;
+
+ /* the work queue now carries its own ref on the object */
+ spin_unlock(&cookie->lock);
+
+ ret = fscache_wait_for_operation_activation(object, op,
+ NULL, NULL, NULL);
+ if (ret == 0) {
+ /* ask the cache to honour the operation */
+ ret = object->cache->ops->check_consistency(op);
+ fscache_op_complete(op, false);
+ } else if (ret == -ENOBUFS) {
+ ret = 0;
+ }
+
+ fscache_put_operation(op);
+ _leave(" = %d", ret);
+ return ret;
+
+submit_failed:
+ atomic_dec(&cookie->n_active);
+inconsistent:
+ spin_unlock(&cookie->lock);
+ kfree(op);
+ _leave(" = -ESTALE");
+ return -ESTALE;
+}
+EXPORT_SYMBOL(__fscache_check_consistency);
diff --git a/fs/fscache/internal.h b/fs/fscache/internal.h
index 12d505bedb5c..4226f6680b06 100644
--- a/fs/fscache/internal.h
+++ b/fs/fscache/internal.h
@@ -130,6 +130,12 @@ extern void fscache_operation_gc(struct work_struct *);
/*
* page.c
*/
+extern int fscache_wait_for_deferred_lookup(struct fscache_cookie *);
+extern int fscache_wait_for_operation_activation(struct fscache_object *,
+ struct fscache_operation *,
+ atomic_t *,
+ atomic_t *,
+ void (*)(struct fscache_operation *));
extern void fscache_invalidate_writes(struct fscache_cookie *);
/*
diff --git a/fs/fscache/page.c b/fs/fscache/page.c
index d479ab3c63e4..8702b732109a 100644
--- a/fs/fscache/page.c
+++ b/fs/fscache/page.c
@@ -278,7 +278,7 @@ static struct fscache_retrieval *fscache_alloc_retrieval(
/*
* wait for a deferred lookup to complete
*/
-static int fscache_wait_for_deferred_lookup(struct fscache_cookie *cookie)
+int fscache_wait_for_deferred_lookup(struct fscache_cookie *cookie)
{
unsigned long jif;
@@ -322,42 +322,46 @@ static void fscache_do_cancel_retrieval(struct fscache_operation *_op)
/*
* wait for an object to become active (or dead)
*/
-static int fscache_wait_for_retrieval_activation(struct fscache_object *object,
- struct fscache_retrieval *op,
- atomic_t *stat_op_waits,
- atomic_t *stat_object_dead)
+int fscache_wait_for_operation_activation(struct fscache_object *object,
+ struct fscache_operation *op,
+ atomic_t *stat_op_waits,
+ atomic_t *stat_object_dead,
+ void (*do_cancel)(struct fscache_operation *))
{
int ret;
- if (!test_bit(FSCACHE_OP_WAITING, &op->op.flags))
+ if (!test_bit(FSCACHE_OP_WAITING, &op->flags))
goto check_if_dead;
_debug(">>> WT");
- fscache_stat(stat_op_waits);
- if (wait_on_bit(&op->op.flags, FSCACHE_OP_WAITING,
+ if (stat_op_waits)
+ fscache_stat(stat_op_waits);
+ if (wait_on_bit(&op->flags, FSCACHE_OP_WAITING,
fscache_wait_bit_interruptible,
TASK_INTERRUPTIBLE) != 0) {
- ret = fscache_cancel_op(&op->op, fscache_do_cancel_retrieval);
+ ret = fscache_cancel_op(op, do_cancel);
if (ret == 0)
return -ERESTARTSYS;
/* it's been removed from the pending queue by another party,
* so we should get to run shortly */
- wait_on_bit(&op->op.flags, FSCACHE_OP_WAITING,
+ wait_on_bit(&op->flags, FSCACHE_OP_WAITING,
fscache_wait_bit, TASK_UNINTERRUPTIBLE);
}
_debug("<<< GO");
check_if_dead:
- if (op->op.state == FSCACHE_OP_ST_CANCELLED) {
- fscache_stat(stat_object_dead);
+ if (op->state == FSCACHE_OP_ST_CANCELLED) {
+ if (stat_object_dead)
+ fscache_stat(stat_object_dead);
_leave(" = -ENOBUFS [cancelled]");
return -ENOBUFS;
}
if (unlikely(fscache_object_is_dead(object))) {
- pr_err("%s() = -ENOBUFS [obj dead %d]\n", __func__, op->op.state);
- fscache_cancel_op(&op->op, fscache_do_cancel_retrieval);
- fscache_stat(stat_object_dead);
+ pr_err("%s() = -ENOBUFS [obj dead %d]\n", __func__, op->state);
+ fscache_cancel_op(op, do_cancel);
+ if (stat_object_dead)
+ fscache_stat(stat_object_dead);
return -ENOBUFS;
}
return 0;
@@ -432,10 +436,11 @@ int __fscache_read_or_alloc_page(struct fscache_cookie *cookie,
/* we wait for the operation to become active, and then process it
* *here*, in this thread, and not in the thread pool */
- ret = fscache_wait_for_retrieval_activation(
- object, op,
+ ret = fscache_wait_for_operation_activation(
+ object, &op->op,
__fscache_stat(&fscache_n_retrieval_op_waits),
- __fscache_stat(&fscache_n_retrievals_object_dead));
+ __fscache_stat(&fscache_n_retrievals_object_dead),
+ fscache_do_cancel_retrieval);
if (ret < 0)
goto error;
@@ -557,10 +562,11 @@ int __fscache_read_or_alloc_pages(struct fscache_cookie *cookie,
/* we wait for the operation to become active, and then process it
* *here*, in this thread, and not in the thread pool */
- ret = fscache_wait_for_retrieval_activation(
- object, op,
+ ret = fscache_wait_for_operation_activation(
+ object, &op->op,
__fscache_stat(&fscache_n_retrieval_op_waits),
- __fscache_stat(&fscache_n_retrievals_object_dead));
+ __fscache_stat(&fscache_n_retrievals_object_dead),
+ fscache_do_cancel_retrieval);
if (ret < 0)
goto error;
@@ -658,10 +664,11 @@ int __fscache_alloc_page(struct fscache_cookie *cookie,
fscache_stat(&fscache_n_alloc_ops);
- ret = fscache_wait_for_retrieval_activation(
- object, op,
+ ret = fscache_wait_for_operation_activation(
+ object, &op->op,
__fscache_stat(&fscache_n_alloc_op_waits),
- __fscache_stat(&fscache_n_allocs_object_dead));
+ __fscache_stat(&fscache_n_allocs_object_dead),
+ fscache_do_cancel_retrieval);
if (ret < 0)
goto error;
@@ -694,6 +701,22 @@ nobufs:
EXPORT_SYMBOL(__fscache_alloc_page);
/*
+ * Unmark pages allocate in the readahead code path (via:
+ * fscache_readpages_or_alloc) after delegating to the base filesystem
+ */
+void __fscache_readpages_cancel(struct fscache_cookie *cookie,
+ struct list_head *pages)
+{
+ struct page *page;
+
+ list_for_each_entry(page, pages, lru) {
+ if (PageFsCache(page))
+ __fscache_uncache_page(cookie, page);
+ }
+}
+EXPORT_SYMBOL(__fscache_readpages_cancel);
+
+/*
* release a write op reference
*/
static void fscache_release_write_op(struct fscache_operation *_op)
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.