On Mon, Mar 5, 2018 at 8:17 PM, Chengguang Xu <cgxu519@xxxxxxx> wrote:
> In current code, regular file and directory use same struct
> ceph_file_info to store fs specific data so the struct has to
> include some fields which are only used for directory
> (e.g., readdir related info), when having plenty of regular files,
> it will lead to memory waste.
>
> This patch introduces dedicated readdir_info cache to separate readdir
> related things from struct ceph_file_info, so that regular file could
> not include those unused fields anymore. Also, chagned to manipulate
> fscache only when reuglar file successfully acquired ceph_file_info.
>
> Signed-off-by: Chengguang Xu <cgxu519@xxxxxxx>
> ---
> fs/ceph/dir.c | 158 +++++++++++++++++++++++--------------------
> fs/ceph/file.c | 88 ++++++++++++++++--------
> fs/ceph/super.c | 14 +++-
> fs/ceph/super.h | 19 ++++--
> include/linux/ceph/libceph.h | 1 +
> 5 files changed, 170 insertions(+), 110 deletions(-)
>
> diff --git a/fs/ceph/dir.c b/fs/ceph/dir.c
> index 0c43468..84bc75a 100644
> --- a/fs/ceph/dir.c
> +++ b/fs/ceph/dir.c
> @@ -105,15 +105,17 @@ static int fpos_cmp(loff_t l, loff_t r)
> static int note_last_dentry(struct ceph_file_info *fi, const char *name,
> int len, unsigned next_offset)
> {
> + struct ceph_readdir_info *ri = fi->readdir_info;
> char *buf = kmalloc(len+1, GFP_KERNEL);
> if (!buf)
> return -ENOMEM;
> - kfree(fi->last_name);
> - fi->last_name = buf;
> - memcpy(fi->last_name, name, len);
> - fi->last_name[len] = 0;
> - fi->next_offset = next_offset;
> - dout("note_last_dentry '%s'\n", fi->last_name);
> +
> + kfree(ri->last_name);
> + ri->last_name = buf;
> + memcpy(ri->last_name, name, len);
> + ri->last_name[len] = 0;
> + ri->next_offset = next_offset;
> + dout("note_last_dentry '%s'\n", ri->last_name);
> return 0;
> }
>
> @@ -176,6 +178,7 @@ static int __dcache_readdir(struct file *file, struct dir_context *ctx,
> int shared_gen)
> {
> struct ceph_file_info *fi = file->private_data;
> + struct ceph_readdir_info *ri = fi->readdir_info;
> struct dentry *parent = file->f_path.dentry;
> struct inode *dir = d_inode(parent);
> struct dentry *dentry, *last = NULL;
> @@ -279,9 +282,9 @@ static int __dcache_readdir(struct file *file, struct dir_context *ctx,
> err = ret;
> dput(last);
> /* last_name no longer match cache index */
> - if (fi->readdir_cache_idx >= 0) {
> - fi->readdir_cache_idx = -1;
> - fi->dir_release_count = 0;
> + if (ri->readdir_cache_idx >= 0) {
> + ri->readdir_cache_idx = -1;
> + ri->dir_release_count = 0;
> }
> }
> return err;
> @@ -289,17 +292,20 @@ static int __dcache_readdir(struct file *file, struct dir_context *ctx,
>
> static bool need_send_readdir(struct ceph_file_info *fi, loff_t pos)
> {
> - if (!fi->last_readdir)
> + struct ceph_readdir_info *ri = fi->readdir_info;
> +
> + if (!ri->last_readdir)
> return true;
> if (is_hash_order(pos))
> - return !ceph_frag_contains_value(fi->frag, fpos_hash(pos));
> + return !ceph_frag_contains_value(ri->frag, fpos_hash(pos));
> else
> - return fi->frag != fpos_frag(pos);
> + return ri->frag != fpos_frag(pos);
> }
>
> static int ceph_readdir(struct file *file, struct dir_context *ctx)
> {
> struct ceph_file_info *fi = file->private_data;
> + struct ceph_readdir_info *ri = fi->readdir_info;
> struct inode *inode = file_inode(file);
> struct ceph_inode_info *ci = ceph_inode(inode);
> struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
> @@ -357,9 +363,9 @@ static int ceph_readdir(struct file *file, struct dir_context *ctx)
> CEPH_MDS_OP_LSSNAP : CEPH_MDS_OP_READDIR;
>
> /* discard old result, if any */
> - if (fi->last_readdir) {
> - ceph_mdsc_put_request(fi->last_readdir);
> - fi->last_readdir = NULL;
> + if (ri->last_readdir) {
> + ceph_mdsc_put_request(ri->last_readdir);
> + ri->last_readdir = NULL;
> }
>
> if (is_hash_order(ctx->pos)) {
> @@ -373,7 +379,7 @@ static int ceph_readdir(struct file *file, struct dir_context *ctx)
> }
>
> dout("readdir fetching %llx.%llx frag %x offset '%s'\n",
> - ceph_vinop(inode), frag, fi->last_name);
> + ceph_vinop(inode), frag, ri->last_name);
> req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS);
> if (IS_ERR(req))
> return PTR_ERR(req);
> @@ -389,8 +395,8 @@ static int ceph_readdir(struct file *file, struct dir_context *ctx)
> __set_bit(CEPH_MDS_R_DIRECT_IS_HASH, &req->r_req_flags);
> req->r_inode_drop = CEPH_CAP_FILE_EXCL;
> }
> - if (fi->last_name) {
> - req->r_path2 = kstrdup(fi->last_name, GFP_KERNEL);
> + if (ri->last_name) {
> + req->r_path2 = kstrdup(ri->last_name, GFP_KERNEL);
> if (!req->r_path2) {
> ceph_mdsc_put_request(req);
> return -ENOMEM;
> @@ -400,10 +406,10 @@ static int ceph_readdir(struct file *file, struct dir_context *ctx)
> cpu_to_le32(fpos_hash(ctx->pos));
> }
>
> - req->r_dir_release_cnt = fi->dir_release_count;
> - req->r_dir_ordered_cnt = fi->dir_ordered_count;
> - req->r_readdir_cache_idx = fi->readdir_cache_idx;
> - req->r_readdir_offset = fi->next_offset;
> + req->r_dir_release_cnt = ri->dir_release_count;
> + req->r_dir_ordered_cnt = ri->dir_ordered_count;
> + req->r_readdir_cache_idx = ri->readdir_cache_idx;
> + req->r_readdir_offset = ri->next_offset;
> req->r_args.readdir.frag = cpu_to_le32(frag);
> req->r_args.readdir.flags =
> cpu_to_le16(CEPH_READDIR_REPLY_BITFLAGS);
> @@ -427,35 +433,35 @@ static int ceph_readdir(struct file *file, struct dir_context *ctx)
> if (le32_to_cpu(rinfo->dir_dir->frag) != frag) {
> frag = le32_to_cpu(rinfo->dir_dir->frag);
> if (!rinfo->hash_order) {
> - fi->next_offset = req->r_readdir_offset;
> + ri->next_offset = req->r_readdir_offset;
> /* adjust ctx->pos to beginning of frag */
> ctx->pos = ceph_make_fpos(frag,
> - fi->next_offset,
> + ri->next_offset,
> false);
> }
> }
>
> - fi->frag = frag;
> - fi->last_readdir = req;
> + ri->frag = frag;
> + ri->last_readdir = req;
>
> if (test_bit(CEPH_MDS_R_DID_PREPOPULATE, &req->r_req_flags)) {
> - fi->readdir_cache_idx = req->r_readdir_cache_idx;
> - if (fi->readdir_cache_idx < 0) {
> + ri->readdir_cache_idx = req->r_readdir_cache_idx;
> + if (ri->readdir_cache_idx < 0) {
> /* preclude from marking dir ordered */
> - fi->dir_ordered_count = 0;
> + ri->dir_ordered_count = 0;
> } else if (ceph_frag_is_leftmost(frag) &&
> - fi->next_offset == 2) {
> + ri->next_offset == 2) {
> /* note dir version at start of readdir so
> * we can tell if any dentries get dropped */
> - fi->dir_release_count = req->r_dir_release_cnt;
> - fi->dir_ordered_count = req->r_dir_ordered_cnt;
> + ri->dir_release_count = req->r_dir_release_cnt;
> + ri->dir_ordered_count = req->r_dir_ordered_cnt;
> }
> } else {
> dout("readdir !did_prepopulate");
> /* disable readdir cache */
> - fi->readdir_cache_idx = -1;
> + ri->readdir_cache_idx = -1;
> /* preclude from marking dir complete */
> - fi->dir_release_count = 0;
> + ri->dir_release_count = 0;
> }
>
> /* note next offset and last dentry name */
> @@ -469,14 +475,14 @@ static int ceph_readdir(struct file *file, struct dir_context *ctx)
> if (err)
> return err;
> } else if (req->r_reply_info.dir_end) {
> - fi->next_offset = 2;
> + ri->next_offset = 2;
> /* keep last name */
> }
> }
>
> - rinfo = &fi->last_readdir->r_reply_info;
> + rinfo = &ri->last_readdir->r_reply_info;
> dout("readdir frag %x num %d pos %llx chunk first %llx\n",
> - fi->frag, rinfo->dir_nr, ctx->pos,
> + ri->frag, rinfo->dir_nr, ctx->pos,
> rinfo->dir_nr ? rinfo->dir_entries[0].offset : 0LL);
>
> i = 0;
> @@ -520,27 +526,27 @@ static int ceph_readdir(struct file *file, struct dir_context *ctx)
> ctx->pos++;
> }
>
> - ceph_mdsc_put_request(fi->last_readdir);
> - fi->last_readdir = NULL;
> + ceph_mdsc_put_request(ri->last_readdir);
> + ri->last_readdir = NULL;
>
> - if (fi->next_offset > 2) {
> - frag = fi->frag;
> + if (ri->next_offset > 2) {
> + frag = ri->frag;
> goto more;
> }
>
> /* more frags? */
> - if (!ceph_frag_is_rightmost(fi->frag)) {
> - frag = ceph_frag_next(fi->frag);
> + if (!ceph_frag_is_rightmost(ri->frag)) {
> + frag = ceph_frag_next(ri->frag);
> if (is_hash_order(ctx->pos)) {
> loff_t new_pos = ceph_make_fpos(ceph_frag_value(frag),
> - fi->next_offset, true);
> + ri->next_offset, true);
> if (new_pos > ctx->pos)
> ctx->pos = new_pos;
> /* keep last_name */
> } else {
> - ctx->pos = ceph_make_fpos(frag, fi->next_offset, false);
> - kfree(fi->last_name);
> - fi->last_name = NULL;
> + ctx->pos = ceph_make_fpos(frag, ri->next_offset, false);
> + kfree(ri->last_name);
> + ri->last_name = NULL;
> }
> dout("readdir next frag is %x\n", frag);
> goto more;
> @@ -552,20 +558,20 @@ static int ceph_readdir(struct file *file, struct dir_context *ctx)
> * were released during the whole readdir, and we should have
> * the complete dir contents in our cache.
> */
> - if (atomic64_read(&ci->i_release_count) == fi->dir_release_count) {
> + if (atomic64_read(&ci->i_release_count) == ri->dir_release_count) {
> spin_lock(&ci->i_ceph_lock);
> - if (fi->dir_ordered_count == atomic64_read(&ci->i_ordered_count)) {
> + if (ri->dir_ordered_count == atomic64_read(&ci->i_ordered_count)) {
> dout(" marking %p complete and ordered\n", inode);
> /* use i_size to track number of entries in
> * readdir cache */
> - BUG_ON(fi->readdir_cache_idx < 0);
> - i_size_write(inode, fi->readdir_cache_idx *
> + BUG_ON(ri->readdir_cache_idx < 0);
> + i_size_write(inode, ri->readdir_cache_idx *
> sizeof(struct dentry*));
> } else {
> dout(" marking %p complete\n", inode);
> }
> - __ceph_dir_set_complete(ci, fi->dir_release_count,
> - fi->dir_ordered_count);
> + __ceph_dir_set_complete(ci, ri->dir_release_count,
> + ri->dir_ordered_count);
> spin_unlock(&ci->i_ceph_lock);
> }
>
> @@ -575,15 +581,17 @@ static int ceph_readdir(struct file *file, struct dir_context *ctx)
>
> static void reset_readdir(struct ceph_file_info *fi)
> {
> - if (fi->last_readdir) {
> - ceph_mdsc_put_request(fi->last_readdir);
> - fi->last_readdir = NULL;
> + struct ceph_readdir_info *ri = fi->readdir_info;
> +
> + if (ri->last_readdir) {
> + ceph_mdsc_put_request(ri->last_readdir);
> + ri->last_readdir = NULL;
> }
> - kfree(fi->last_name);
> - fi->last_name = NULL;
> - fi->dir_release_count = 0;
> - fi->readdir_cache_idx = -1;
> - fi->next_offset = 2; /* compensate for . and .. */
> + kfree(ri->last_name);
> + ri->last_name = NULL;
> + ri->dir_release_count = 0;
> + ri->readdir_cache_idx = -1;
> + ri->next_offset = 2; /* compensate for . and .. */
> fi->flags &= ~CEPH_F_ATEND;
> }
>
> @@ -594,16 +602,18 @@ static void reset_readdir(struct ceph_file_info *fi)
> static bool need_reset_readdir(struct ceph_file_info *fi, loff_t new_pos)
> {
> struct ceph_mds_reply_info_parsed *rinfo;
> + struct ceph_readdir_info *ri = fi->readdir_info;
> loff_t chunk_offset;
> +
> if (new_pos == 0)
> return true;
> if (is_hash_order(new_pos)) {
> /* no need to reset last_name for a forward seek when
> * dentries are sotred in hash order */
> - } else if (fi->frag != fpos_frag(new_pos)) {
> + } else if (ri->frag != fpos_frag(new_pos)) {
> return true;
> }
> - rinfo = fi->last_readdir ? &fi->last_readdir->r_reply_info : NULL;
> + rinfo = ri->last_readdir ? &ri->last_readdir->r_reply_info : NULL;
> if (!rinfo || !rinfo->dir_nr)
> return true;
> chunk_offset = rinfo->dir_entries[0].offset;
> @@ -614,6 +624,7 @@ static bool need_reset_readdir(struct ceph_file_info *fi, loff_t new_pos)
> static loff_t ceph_dir_llseek(struct file *file, loff_t offset, int whence)
> {
> struct ceph_file_info *fi = file->private_data;
> + struct ceph_readdir_info *ri = fi->readdir_info;
> struct inode *inode = file->f_mapping->host;
> loff_t retval;
>
> @@ -637,8 +648,8 @@ static loff_t ceph_dir_llseek(struct file *file, loff_t offset, int whence)
> } else if (is_hash_order(offset) && offset > file->f_pos) {
> /* for hash offset, we don't know if a forward seek
> * is within same frag */
> - fi->dir_release_count = 0;
> - fi->readdir_cache_idx = -1;
> + ri->dir_release_count = 0;
> + ri->readdir_cache_idx = -1;
> }
>
> if (offset != file->f_pos) {
> @@ -1371,6 +1382,7 @@ static ssize_t ceph_read_dir(struct file *file, char __user *buf, size_t size,
> loff_t *ppos)
> {
> struct ceph_file_info *cf = file->private_data;
> + struct ceph_readdir_info *ri = cf->readdir_info;
> struct inode *inode = file_inode(file);
> struct ceph_inode_info *ci = ceph_inode(inode);
> int left;
> @@ -1379,12 +1391,12 @@ static ssize_t ceph_read_dir(struct file *file, char __user *buf, size_t size,
> if (!ceph_test_mount_opt(ceph_sb_to_client(inode->i_sb), DIRSTAT))
> return -EISDIR;
>
> - if (!cf->dir_info) {
> - cf->dir_info = kmalloc(bufsize, GFP_KERNEL);
> - if (!cf->dir_info)
> + if (!ri->dir_info) {
> + ri->dir_info = kmalloc(bufsize, GFP_KERNEL);
> + if (!ri->dir_info)
> return -ENOMEM;
> - cf->dir_info_len =
> - snprintf(cf->dir_info, bufsize,
> + ri->dir_info_len =
> + snprintf(ri->dir_info, bufsize,
> "entries: %20lld\n"
> " files: %20lld\n"
> " subdirs: %20lld\n"
> @@ -1404,10 +1416,10 @@ static ssize_t ceph_read_dir(struct file *file, char __user *buf, size_t size,
> (long)ci->i_rctime.tv_nsec);
> }
>
> - if (*ppos >= cf->dir_info_len)
> + if (*ppos >= ri->dir_info_len)
> return 0;
> - size = min_t(unsigned, size, cf->dir_info_len-*ppos);
> - left = copy_to_user(buf, cf->dir_info + *ppos, size);
> + size = min_t(unsigned int, size, ri->dir_info_len-*ppos);
> + left = copy_to_user(buf, ri->dir_info + *ppos, size);
> if (left == size)
> return -EFAULT;
> *ppos += (size - left);
> diff --git a/fs/ceph/file.c b/fs/ceph/file.c
> index 6639926..611aaef 100644
> --- a/fs/ceph/file.c
> +++ b/fs/ceph/file.c
> @@ -159,36 +159,60 @@ static size_t dio_get_pagev_size(const struct iov_iter *it)
> return req;
> }
>
> +
> +static int ceph_init_file_info(struct inode *inode,
> + struct file *file, int fmode)
> +{
> + struct ceph_file_info *fi;
> +
> + dout("init_file inode %p file %p mode 0%o (%s)\n", inode, file,
> + inode->i_mode, S_ISREG(inode->i_mode) ? "regular" : "dir");
> +
> + BUG_ON(inode->i_fop->release != ceph_release);
> +
> + fi = kmem_cache_zalloc(ceph_file_cachep, GFP_KERNEL);
> + if (!fi) {
> + ceph_put_fmode(ceph_inode(inode), fmode); /* clean up */
> + return -ENOMEM;
> + }
> +
> + if (S_ISDIR(inode->i_mode)) {
> + fi->readdir_info = kmem_cache_zalloc(ceph_readdir_cachep,
> + GFP_KERNEL);
> + if (!fi->readdir_info) {
> + kmem_cache_free(ceph_file_cachep, fi);
> + return -ENOMEM;
> + }
> +
> + fi->readdir_info->next_offset = 2;
> + fi->readdir_info->readdir_cache_idx = -1;
> + } else {
> + ceph_fscache_register_inode_cookie(inode);
> + ceph_fscache_file_set_cookie(inode, file);
> + }
> +
> + fi->fmode = fmode;
> + spin_lock_init(&fi->rw_contexts_lock);
> + INIT_LIST_HEAD(&fi->rw_contexts);
> + file->private_data = fi;
> +
> + return 0;
> +}
> +
> /*
> * initialize private struct file data.
> * if we fail, clean up by dropping fmode reference on the ceph_inode
> */
> static int ceph_init_file(struct inode *inode, struct file *file, int fmode)
> {
> - struct ceph_file_info *cf;
> int ret = 0;
>
> switch (inode->i_mode & S_IFMT) {
> case S_IFREG:
> - ceph_fscache_register_inode_cookie(inode);
> - ceph_fscache_file_set_cookie(inode, file);
> case S_IFDIR:
> - dout("init_file %p %p 0%o (regular)\n", inode, file,
> - inode->i_mode);
> - cf = kmem_cache_zalloc(ceph_file_cachep, GFP_KERNEL);
> - if (!cf) {
> - ceph_put_fmode(ceph_inode(inode), fmode); /* clean up */
> - return -ENOMEM;
> - }
> - cf->fmode = fmode;
> -
> - spin_lock_init(&cf->rw_contexts_lock);
> - INIT_LIST_HEAD(&cf->rw_contexts);
> -
> - cf->next_offset = 2;
> - cf->readdir_cache_idx = -1;
> - file->private_data = cf;
> - BUG_ON(inode->i_fop->release != ceph_release);
> + ret = ceph_init_file_info(inode, file, fmode);
> + if (ret)
> + return ret;
> break;
>
> case S_IFLNK:
> @@ -460,16 +484,24 @@ int ceph_atomic_open(struct inode *dir, struct dentry *dentry,
> int ceph_release(struct inode *inode, struct file *file)
> {
> struct ceph_inode_info *ci = ceph_inode(inode);
> - struct ceph_file_info *cf = file->private_data;
> + struct ceph_file_info *fi = file->private_data;
> + struct ceph_readdir_info *ri = fi->readdir_info;
> +
> + dout("release inode %p file %p mode 0%o (%s)\n", inode, file,
> + inode->i_mode, S_ISREG(inode->i_mode) ? "regular" : "dir");
>
> - dout("release inode %p file %p\n", inode, file);
> - ceph_put_fmode(ci, cf->fmode);
> - if (cf->last_readdir)
> - ceph_mdsc_put_request(cf->last_readdir);
> - kfree(cf->last_name);
> - kfree(cf->dir_info);
> - WARN_ON(!list_empty(&cf->rw_contexts));
> - kmem_cache_free(ceph_file_cachep, cf);
> + WARN_ON(!list_empty(&fi->rw_contexts));
> +
> + ceph_put_fmode(ci, fi->fmode);
> + if (ri) {
> + if (ri->last_readdir)
> + ceph_mdsc_put_request(ri->last_readdir);
> + kfree(ri->last_name);
> + kfree(ri->dir_info);
> + kmem_cache_free(ceph_readdir_cachep, ri);
> + ri = NULL;
> + }
> + kmem_cache_free(ceph_file_cachep, fi);
>
> /* wake up anyone waiting for caps on this inode */
> wake_up_all(&ci->i_cap_wq);
> diff --git a/fs/ceph/super.c b/fs/ceph/super.c
> index a62d2a9..c1732ff 100644
> --- a/fs/ceph/super.c
> +++ b/fs/ceph/super.c
> @@ -677,6 +677,7 @@ static void destroy_fs_client(struct ceph_fs_client *fsc)
> struct kmem_cache *ceph_cap_flush_cachep;
> struct kmem_cache *ceph_dentry_cachep;
> struct kmem_cache *ceph_file_cachep;
> +struct kmem_cache *ceph_readdir_cachep;
>
> static void ceph_inode_init_once(void *foo)
> {
> @@ -711,14 +712,22 @@ static int __init init_caches(void)
> goto bad_dentry;
>
> ceph_file_cachep = KMEM_CACHE(ceph_file_info, SLAB_MEM_SPREAD);
> -
> if (!ceph_file_cachep)
> goto bad_file;
>
> + ceph_readdir_cachep = KMEM_CACHE(ceph_readdir_info, SLAB_MEM_SPREAD);
> + if (!ceph_readdir_cachep)
> + goto bad_readdir;
> +
> if ((error = ceph_fscache_register()))
> - goto bad_file;
> + goto bad_fscache;
>
> return 0;
> +
> +bad_fscache:
> + kmem_cache_destroy(ceph_readdir_cachep);
> +bad_readdir:
> + kmem_cache_destroy(ceph_file_cachep);
> bad_file:
> kmem_cache_destroy(ceph_dentry_cachep);
> bad_dentry:
> @@ -743,6 +752,7 @@ static void destroy_caches(void)
> kmem_cache_destroy(ceph_cap_flush_cachep);
> kmem_cache_destroy(ceph_dentry_cachep);
> kmem_cache_destroy(ceph_file_cachep);
> + kmem_cache_destroy(ceph_readdir_cachep);
>
> ceph_fscache_unregister();
> }
> diff --git a/fs/ceph/super.h b/fs/ceph/super.h
> index 21b2e5b..3a943a0 100644
> --- a/fs/ceph/super.h
> +++ b/fs/ceph/super.h
> @@ -665,13 +665,7 @@ extern void ceph_reservation_status(struct ceph_fs_client *client,
> #define CEPH_F_SYNC 1
> #define CEPH_F_ATEND 2
>
> -struct ceph_file_info {
> - short fmode; /* initialized on open */
> - short flags; /* CEPH_F_* */
> -
> - spinlock_t rw_contexts_lock;
> - struct list_head rw_contexts;
> -
> +struct ceph_readdir_info {
> /* readdir: position within the dir */
> u32 frag;
> struct ceph_mds_request *last_readdir;
> @@ -688,6 +682,17 @@ struct ceph_file_info {
> int dir_info_len;
> };
>
> +struct ceph_file_info {
> + short fmode; /* initialized on open */
> + short flags; /* CEPH_F_* */
> +
> + spinlock_t rw_contexts_lock;
> + struct list_head rw_contexts;
> +
> + /* readdir related things */
> + struct ceph_readdir_info *readdir_info;
> +};
For dir file. I prefer something like:
struct ceph_dir_file_info {
struct ceph_file_info file;
ceph_readdir_info readdir.
};
This avoids double memory allocation for dir file.
Regards
Yan, Zheng
> +
> struct ceph_rw_context {
> struct list_head list;
> struct task_struct *thread;
> diff --git a/include/linux/ceph/libceph.h b/include/linux/ceph/libceph.h
> index c2ec44c..4ca23fa 100644
> --- a/include/linux/ceph/libceph.h
> +++ b/include/linux/ceph/libceph.h
> @@ -262,6 +262,7 @@ static inline int calc_pages_for(u64 off, u64 len)
> extern struct kmem_cache *ceph_cap_flush_cachep;
> extern struct kmem_cache *ceph_dentry_cachep;
> extern struct kmem_cache *ceph_file_cachep;
> +extern struct kmem_cache *ceph_readdir_cachep;
>
> /* ceph_common.c */
> extern bool libceph_compatible(void *data);
> --
> 1.8.3.1
>
> --
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