dir.c 36.8 KB
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#include <linux/ceph/ceph_debug.h>
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#include <linux/spinlock.h>
#include <linux/fs_struct.h>
#include <linux/namei.h>
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#include <linux/slab.h>
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#include <linux/sched.h>

#include "super.h"
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#include "mds_client.h"
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/*
 * Directory operations: readdir, lookup, create, link, unlink,
 * rename, etc.
 */

/*
 * Ceph MDS operations are specified in terms of a base ino and
 * relative path.  Thus, the client can specify an operation on a
 * specific inode (e.g., a getattr due to fstat(2)), or as a path
 * relative to, say, the root directory.
 *
 * Normally, we limit ourselves to strict inode ops (no path component)
 * or dentry operations (a single path component relative to an ino).  The
 * exception to this is open_root_dentry(), which will open the mount
 * point by name.
 */

const struct inode_operations ceph_dir_iops;
const struct file_operations ceph_dir_fops;
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const struct dentry_operations ceph_dentry_ops;
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/*
 * Initialize ceph dentry state.
 */
int ceph_init_dentry(struct dentry *dentry)
{
	struct ceph_dentry_info *di;

	if (dentry->d_fsdata)
		return 0;

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	di = kmem_cache_alloc(ceph_dentry_cachep, GFP_NOFS | __GFP_ZERO);
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	if (!di)
		return -ENOMEM;          /* oh well */

	spin_lock(&dentry->d_lock);
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	if (dentry->d_fsdata) {
		/* lost a race */
		kmem_cache_free(ceph_dentry_cachep, di);
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		goto out_unlock;
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	}
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	if (dentry->d_parent == NULL ||   /* nfs fh_to_dentry */
	    ceph_snap(dentry->d_parent->d_inode) == CEPH_NOSNAP)
		d_set_d_op(dentry, &ceph_dentry_ops);
	else if (ceph_snap(dentry->d_parent->d_inode) == CEPH_SNAPDIR)
		d_set_d_op(dentry, &ceph_snapdir_dentry_ops);
	else
		d_set_d_op(dentry, &ceph_snap_dentry_ops);

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	di->dentry = dentry;
	di->lease_session = NULL;
	dentry->d_time = jiffies;
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	/* avoid reordering d_fsdata setup so that the check above is safe */
	smp_mb();
	dentry->d_fsdata = di;
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	ceph_dentry_lru_add(dentry);
out_unlock:
	spin_unlock(&dentry->d_lock);
	return 0;
}

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struct inode *ceph_get_dentry_parent_inode(struct dentry *dentry)
{
	struct inode *inode = NULL;

	if (!dentry)
		return NULL;

	spin_lock(&dentry->d_lock);
	if (dentry->d_parent) {
		inode = dentry->d_parent->d_inode;
		ihold(inode);
	}
	spin_unlock(&dentry->d_lock);
	return inode;
}
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/*
 * for readdir, we encode the directory frag and offset within that
 * frag into f_pos.
 */
static unsigned fpos_frag(loff_t p)
{
	return p >> 32;
}
static unsigned fpos_off(loff_t p)
{
	return p & 0xffffffff;
}

/*
 * When possible, we try to satisfy a readdir by peeking at the
 * dcache.  We make this work by carefully ordering dentries on
 * d_u.d_child when we initially get results back from the MDS, and
 * falling back to a "normal" sync readdir if any dentries in the dir
 * are dropped.
 *
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 * D_COMPLETE tells indicates we have all dentries in the dir.  It is
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 * defined IFF we hold CEPH_CAP_FILE_SHARED (which will be revoked by
 * the MDS if/when the directory is modified).
 */
static int __dcache_readdir(struct file *filp,
			    void *dirent, filldir_t filldir)
{
	struct ceph_file_info *fi = filp->private_data;
	struct dentry *parent = filp->f_dentry;
	struct inode *dir = parent->d_inode;
	struct list_head *p;
	struct dentry *dentry, *last;
	struct ceph_dentry_info *di;
	int err = 0;

	/* claim ref on last dentry we returned */
	last = fi->dentry;
	fi->dentry = NULL;

	dout("__dcache_readdir %p at %llu (last %p)\n", dir, filp->f_pos,
	     last);

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	spin_lock(&parent->d_lock);
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	/* start at beginning? */
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	if (filp->f_pos == 2 || last == NULL ||
	    filp->f_pos < ceph_dentry(last)->offset) {
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		if (list_empty(&parent->d_subdirs))
			goto out_unlock;
		p = parent->d_subdirs.prev;
		dout(" initial p %p/%p\n", p->prev, p->next);
	} else {
		p = last->d_u.d_child.prev;
	}

more:
	dentry = list_entry(p, struct dentry, d_u.d_child);
	di = ceph_dentry(dentry);
	while (1) {
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		dout(" p %p/%p %s d_subdirs %p/%p\n", p->prev, p->next,
		     d_unhashed(dentry) ? "!hashed" : "hashed",
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		     parent->d_subdirs.prev, parent->d_subdirs.next);
		if (p == &parent->d_subdirs) {
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			fi->flags |= CEPH_F_ATEND;
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			goto out_unlock;
		}
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		spin_lock_nested(&dentry->d_lock, DENTRY_D_LOCK_NESTED);
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		if (!d_unhashed(dentry) && dentry->d_inode &&
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		    ceph_snap(dentry->d_inode) != CEPH_SNAPDIR &&
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		    ceph_ino(dentry->d_inode) != CEPH_INO_CEPH &&
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		    filp->f_pos <= di->offset)
			break;
		dout(" skipping %p %.*s at %llu (%llu)%s%s\n", dentry,
		     dentry->d_name.len, dentry->d_name.name, di->offset,
		     filp->f_pos, d_unhashed(dentry) ? " unhashed" : "",
		     !dentry->d_inode ? " null" : "");
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		spin_unlock(&dentry->d_lock);
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		p = p->prev;
		dentry = list_entry(p, struct dentry, d_u.d_child);
		di = ceph_dentry(dentry);
	}

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	dget_dlock(dentry);
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	spin_unlock(&dentry->d_lock);
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	spin_unlock(&parent->d_lock);
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	dout(" %llu (%llu) dentry %p %.*s %p\n", di->offset, filp->f_pos,
	     dentry, dentry->d_name.len, dentry->d_name.name, dentry->d_inode);
	filp->f_pos = di->offset;
	err = filldir(dirent, dentry->d_name.name,
		      dentry->d_name.len, di->offset,
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		      ceph_translate_ino(dentry->d_sb, dentry->d_inode->i_ino),
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		      dentry->d_inode->i_mode >> 12);

	if (last) {
		if (err < 0) {
			/* remember our position */
			fi->dentry = last;
			fi->next_offset = di->offset;
		} else {
			dput(last);
		}
	}
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	last = dentry;

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	if (err < 0)
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		goto out;
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	filp->f_pos++;

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	/* make sure a dentry wasn't dropped while we didn't have parent lock */
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	if (!ceph_dir_test_complete(dir)) {
		dout(" lost D_COMPLETE on %p; falling back to mds\n", dir);
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		err = -EAGAIN;
		goto out;
	}

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	spin_lock(&parent->d_lock);
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	p = p->prev;	/* advance to next dentry */
	goto more;
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out_unlock:
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	spin_unlock(&parent->d_lock);
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out:
	if (last)
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		dput(last);
	return err;
}

/*
 * make note of the last dentry we read, so we can
 * continue at the same lexicographical point,
 * regardless of what dir changes take place on the
 * server.
 */
static int note_last_dentry(struct ceph_file_info *fi, const char *name,
			    int len)
{
	kfree(fi->last_name);
	fi->last_name = kmalloc(len+1, GFP_NOFS);
	if (!fi->last_name)
		return -ENOMEM;
	memcpy(fi->last_name, name, len);
	fi->last_name[len] = 0;
	dout("note_last_dentry '%s'\n", fi->last_name);
	return 0;
}

static int ceph_readdir(struct file *filp, void *dirent, filldir_t filldir)
{
	struct ceph_file_info *fi = filp->private_data;
	struct inode *inode = filp->f_dentry->d_inode;
	struct ceph_inode_info *ci = ceph_inode(inode);
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	struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
	struct ceph_mds_client *mdsc = fsc->mdsc;
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	unsigned frag = fpos_frag(filp->f_pos);
	int off = fpos_off(filp->f_pos);
	int err;
	u32 ftype;
	struct ceph_mds_reply_info_parsed *rinfo;
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	const int max_entries = fsc->mount_options->max_readdir;
	const int max_bytes = fsc->mount_options->max_readdir_bytes;
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	dout("readdir %p filp %p frag %u off %u\n", inode, filp, frag, off);
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	if (fi->flags & CEPH_F_ATEND)
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		return 0;

	/* always start with . and .. */
	if (filp->f_pos == 0) {
		/* note dir version at start of readdir so we can tell
		 * if any dentries get dropped */
		fi->dir_release_count = ci->i_release_count;

		dout("readdir off 0 -> '.'\n");
		if (filldir(dirent, ".", 1, ceph_make_fpos(0, 0),
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			    ceph_translate_ino(inode->i_sb, inode->i_ino),
			    inode->i_mode >> 12) < 0)
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			return 0;
		filp->f_pos = 1;
		off = 1;
	}
	if (filp->f_pos == 1) {
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		ino_t ino = parent_ino(filp->f_dentry);
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		dout("readdir off 1 -> '..'\n");
		if (filldir(dirent, "..", 2, ceph_make_fpos(0, 1),
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			    ceph_translate_ino(inode->i_sb, ino),
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			    inode->i_mode >> 12) < 0)
			return 0;
		filp->f_pos = 2;
		off = 2;
	}

	/* can we use the dcache? */
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	spin_lock(&ci->i_ceph_lock);
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	if ((filp->f_pos == 2 || fi->dentry) &&
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	    !ceph_test_mount_opt(fsc, NOASYNCREADDIR) &&
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	    ceph_snap(inode) != CEPH_SNAPDIR &&
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	    ceph_dir_test_complete(inode) &&
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	    __ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1)) {
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		spin_unlock(&ci->i_ceph_lock);
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		err = __dcache_readdir(filp, dirent, filldir);
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		if (err != -EAGAIN)
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			return err;
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	} else {
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		spin_unlock(&ci->i_ceph_lock);
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	}
	if (fi->dentry) {
		err = note_last_dentry(fi, fi->dentry->d_name.name,
				       fi->dentry->d_name.len);
		if (err)
			return err;
		dput(fi->dentry);
		fi->dentry = NULL;
	}

	/* proceed with a normal readdir */

more:
	/* do we have the correct frag content buffered? */
	if (fi->frag != frag || fi->last_readdir == NULL) {
		struct ceph_mds_request *req;
		int op = ceph_snap(inode) == CEPH_SNAPDIR ?
			CEPH_MDS_OP_LSSNAP : CEPH_MDS_OP_READDIR;

		/* discard old result, if any */
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		if (fi->last_readdir) {
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			ceph_mdsc_put_request(fi->last_readdir);
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			fi->last_readdir = NULL;
		}
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		/* requery frag tree, as the frag topology may have changed */
		frag = ceph_choose_frag(ceph_inode(inode), frag, NULL, NULL);

		dout("readdir fetching %llx.%llx frag %x offset '%s'\n",
		     ceph_vinop(inode), frag, fi->last_name);
		req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS);
		if (IS_ERR(req))
			return PTR_ERR(req);
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		req->r_inode = inode;
		ihold(inode);
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		req->r_dentry = dget(filp->f_dentry);
		/* hints to request -> mds selection code */
		req->r_direct_mode = USE_AUTH_MDS;
		req->r_direct_hash = ceph_frag_value(frag);
		req->r_direct_is_hash = true;
		req->r_path2 = kstrdup(fi->last_name, GFP_NOFS);
		req->r_readdir_offset = fi->next_offset;
		req->r_args.readdir.frag = cpu_to_le32(frag);
		req->r_args.readdir.max_entries = cpu_to_le32(max_entries);
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		req->r_args.readdir.max_bytes = cpu_to_le32(max_bytes);
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		req->r_num_caps = max_entries + 1;
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		err = ceph_mdsc_do_request(mdsc, NULL, req);
		if (err < 0) {
			ceph_mdsc_put_request(req);
			return err;
		}
		dout("readdir got and parsed readdir result=%d"
		     " on frag %x, end=%d, complete=%d\n", err, frag,
		     (int)req->r_reply_info.dir_end,
		     (int)req->r_reply_info.dir_complete);

		if (!req->r_did_prepopulate) {
			dout("readdir !did_prepopulate");
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			fi->dir_release_count--;    /* preclude D_COMPLETE */
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		}

		/* note next offset and last dentry name */
		fi->offset = fi->next_offset;
		fi->last_readdir = req;

		if (req->r_reply_info.dir_end) {
			kfree(fi->last_name);
			fi->last_name = NULL;
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			if (ceph_frag_is_rightmost(frag))
				fi->next_offset = 2;
			else
				fi->next_offset = 0;
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		} else {
			rinfo = &req->r_reply_info;
			err = note_last_dentry(fi,
				       rinfo->dir_dname[rinfo->dir_nr-1],
				       rinfo->dir_dname_len[rinfo->dir_nr-1]);
			if (err)
				return err;
			fi->next_offset += rinfo->dir_nr;
		}
	}

	rinfo = &fi->last_readdir->r_reply_info;
	dout("readdir frag %x num %d off %d chunkoff %d\n", frag,
	     rinfo->dir_nr, off, fi->offset);
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	while (off >= fi->offset && off - fi->offset < rinfo->dir_nr) {
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		u64 pos = ceph_make_fpos(frag, off);
		struct ceph_mds_reply_inode *in =
			rinfo->dir_in[off - fi->offset].in;
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		struct ceph_vino vino;
		ino_t ino;

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		dout("readdir off %d (%d/%d) -> %lld '%.*s' %p\n",
		     off, off - fi->offset, rinfo->dir_nr, pos,
		     rinfo->dir_dname_len[off - fi->offset],
		     rinfo->dir_dname[off - fi->offset], in);
		BUG_ON(!in);
		ftype = le32_to_cpu(in->mode) >> 12;
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		vino.ino = le64_to_cpu(in->ino);
		vino.snap = le64_to_cpu(in->snapid);
		ino = ceph_vino_to_ino(vino);
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		if (filldir(dirent,
			    rinfo->dir_dname[off - fi->offset],
			    rinfo->dir_dname_len[off - fi->offset],
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			    pos,
			    ceph_translate_ino(inode->i_sb, ino), ftype) < 0) {
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			dout("filldir stopping us...\n");
			return 0;
		}
		off++;
		filp->f_pos = pos + 1;
	}

	if (fi->last_name) {
		ceph_mdsc_put_request(fi->last_readdir);
		fi->last_readdir = NULL;
		goto more;
	}

	/* more frags? */
	if (!ceph_frag_is_rightmost(frag)) {
		frag = ceph_frag_next(frag);
		off = 0;
		filp->f_pos = ceph_make_fpos(frag, off);
		dout("readdir next frag is %x\n", frag);
		goto more;
	}
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	fi->flags |= CEPH_F_ATEND;
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	/*
	 * if dir_release_count still matches the dir, no dentries
	 * were released during the whole readdir, and we should have
	 * the complete dir contents in our cache.
	 */
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	spin_lock(&ci->i_ceph_lock);
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	if (ci->i_release_count == fi->dir_release_count) {
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		ceph_dir_set_complete(inode);
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		ci->i_max_offset = filp->f_pos;
	}
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	spin_unlock(&ci->i_ceph_lock);
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	dout("readdir %p filp %p done.\n", inode, filp);
	return 0;
}

static void reset_readdir(struct ceph_file_info *fi)
{
	if (fi->last_readdir) {
		ceph_mdsc_put_request(fi->last_readdir);
		fi->last_readdir = NULL;
	}
	kfree(fi->last_name);
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	fi->last_name = NULL;
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	fi->next_offset = 2;  /* compensate for . and .. */
	if (fi->dentry) {
		dput(fi->dentry);
		fi->dentry = NULL;
	}
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	fi->flags &= ~CEPH_F_ATEND;
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}

static loff_t ceph_dir_llseek(struct file *file, loff_t offset, int origin)
{
	struct ceph_file_info *fi = file->private_data;
	struct inode *inode = file->f_mapping->host;
	loff_t old_offset = offset;
	loff_t retval;

	mutex_lock(&inode->i_mutex);
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	retval = -EINVAL;
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	switch (origin) {
	case SEEK_END:
		offset += inode->i_size + 2;   /* FIXME */
		break;
	case SEEK_CUR:
		offset += file->f_pos;
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	case SEEK_SET:
		break;
	default:
		goto out;
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	}
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	if (offset >= 0 && offset <= inode->i_sb->s_maxbytes) {
		if (offset != file->f_pos) {
			file->f_pos = offset;
			file->f_version = 0;
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			fi->flags &= ~CEPH_F_ATEND;
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		}
		retval = offset;

		/*
		 * discard buffered readdir content on seekdir(0), or
		 * seek to new frag, or seek prior to current chunk.
		 */
		if (offset == 0 ||
		    fpos_frag(offset) != fpos_frag(old_offset) ||
		    fpos_off(offset) < fi->offset) {
			dout("dir_llseek dropping %p content\n", file);
			reset_readdir(fi);
		}

		/* bump dir_release_count if we did a forward seek */
		if (offset > old_offset)
			fi->dir_release_count--;
	}
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out:
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	mutex_unlock(&inode->i_mutex);
	return retval;
}

/*
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 * Handle lookups for the hidden .snap directory.
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 */
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int ceph_handle_snapdir(struct ceph_mds_request *req,
			struct dentry *dentry, int err)
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{
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	struct ceph_fs_client *fsc = ceph_sb_to_client(dentry->d_sb);
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	struct inode *parent = dentry->d_parent->d_inode; /* we hold i_mutex */
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	/* .snap dir? */
	if (err == -ENOENT &&
518
	    ceph_snap(parent) == CEPH_NOSNAP &&
519
	    strcmp(dentry->d_name.name,
520
		   fsc->mount_options->snapdir_name) == 0) {
S
Sage Weil 已提交
521 522 523
		struct inode *inode = ceph_get_snapdir(parent);
		dout("ENOENT on snapdir %p '%.*s', linking to snapdir %p\n",
		     dentry, dentry->d_name.len, dentry->d_name.name, inode);
524
		BUG_ON(!d_unhashed(dentry));
S
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525 526 527
		d_add(dentry, inode);
		err = 0;
	}
528 529
	return err;
}
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531 532 533 534 535 536 537 538 539 540 541 542 543 544
/*
 * Figure out final result of a lookup/open request.
 *
 * Mainly, make sure we return the final req->r_dentry (if it already
 * existed) in place of the original VFS-provided dentry when they
 * differ.
 *
 * Gracefully handle the case where the MDS replies with -ENOENT and
 * no trace (which it may do, at its discretion, e.g., if it doesn't
 * care to issue a lease on the negative dentry).
 */
struct dentry *ceph_finish_lookup(struct ceph_mds_request *req,
				  struct dentry *dentry, int err)
{
S
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545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567
	if (err == -ENOENT) {
		/* no trace? */
		err = 0;
		if (!req->r_reply_info.head->is_dentry) {
			dout("ENOENT and no trace, dentry %p inode %p\n",
			     dentry, dentry->d_inode);
			if (dentry->d_inode) {
				d_drop(dentry);
				err = -ENOENT;
			} else {
				d_add(dentry, NULL);
			}
		}
	}
	if (err)
		dentry = ERR_PTR(err);
	else if (dentry != req->r_dentry)
		dentry = dget(req->r_dentry);   /* we got spliced */
	else
		dentry = NULL;
	return dentry;
}

S
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568 569 570 571 572 573
static int is_root_ceph_dentry(struct inode *inode, struct dentry *dentry)
{
	return ceph_ino(inode) == CEPH_INO_ROOT &&
		strncmp(dentry->d_name.name, ".ceph", 5) == 0;
}

S
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/*
 * Look up a single dir entry.  If there is a lookup intent, inform
 * the MDS so that it gets our 'caps wanted' value in a single op.
 */
static struct dentry *ceph_lookup(struct inode *dir, struct dentry *dentry,
				  struct nameidata *nd)
{
581 582
	struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
	struct ceph_mds_client *mdsc = fsc->mdsc;
S
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583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601
	struct ceph_mds_request *req;
	int op;
	int err;

	dout("lookup %p dentry %p '%.*s'\n",
	     dir, dentry, dentry->d_name.len, dentry->d_name.name);

	if (dentry->d_name.len > NAME_MAX)
		return ERR_PTR(-ENAMETOOLONG);

	err = ceph_init_dentry(dentry);
	if (err < 0)
		return ERR_PTR(err);

	/* open (but not create!) intent? */
	if (nd &&
	    (nd->flags & LOOKUP_OPEN) &&
	    !(nd->intent.open.flags & O_CREAT)) {
		int mode = nd->intent.open.create_mode & ~current->fs->umask;
602
		return ceph_lookup_open(dir, dentry, nd, mode);
S
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603 604 605 606 607 608 609
	}

	/* can we conclude ENOENT locally? */
	if (dentry->d_inode == NULL) {
		struct ceph_inode_info *ci = ceph_inode(dir);
		struct ceph_dentry_info *di = ceph_dentry(dentry);

610
		spin_lock(&ci->i_ceph_lock);
S
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611 612
		dout(" dir %p flags are %d\n", dir, ci->i_ceph_flags);
		if (strncmp(dentry->d_name.name,
613
			    fsc->mount_options->snapdir_name,
S
Sage Weil 已提交
614
			    dentry->d_name.len) &&
S
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615
		    !is_root_ceph_dentry(dir, dentry) &&
S
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616
		    ceph_dir_test_complete(dir) &&
S
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617
		    (__ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1))) {
618
			spin_unlock(&ci->i_ceph_lock);
S
Sage Weil 已提交
619 620 621 622 623
			dout(" dir %p complete, -ENOENT\n", dir);
			d_add(dentry, NULL);
			di->lease_shared_gen = ci->i_shared_gen;
			return NULL;
		}
624
		spin_unlock(&ci->i_ceph_lock);
S
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625 626 627 628 629 630
	}

	op = ceph_snap(dir) == CEPH_SNAPDIR ?
		CEPH_MDS_OP_LOOKUPSNAP : CEPH_MDS_OP_LOOKUP;
	req = ceph_mdsc_create_request(mdsc, op, USE_ANY_MDS);
	if (IS_ERR(req))
J
Julia Lawall 已提交
631
		return ERR_CAST(req);
S
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632 633 634 635 636 637
	req->r_dentry = dget(dentry);
	req->r_num_caps = 2;
	/* we only need inode linkage */
	req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INODE);
	req->r_locked_dir = dir;
	err = ceph_mdsc_do_request(mdsc, NULL, req);
638
	err = ceph_handle_snapdir(req, dentry, err);
S
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639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668
	dentry = ceph_finish_lookup(req, dentry, err);
	ceph_mdsc_put_request(req);  /* will dput(dentry) */
	dout("lookup result=%p\n", dentry);
	return dentry;
}

/*
 * If we do a create but get no trace back from the MDS, follow up with
 * a lookup (the VFS expects us to link up the provided dentry).
 */
int ceph_handle_notrace_create(struct inode *dir, struct dentry *dentry)
{
	struct dentry *result = ceph_lookup(dir, dentry, NULL);

	if (result && !IS_ERR(result)) {
		/*
		 * We created the item, then did a lookup, and found
		 * it was already linked to another inode we already
		 * had in our cache (and thus got spliced).  Link our
		 * dentry to that inode, but don't hash it, just in
		 * case the VFS wants to dereference it.
		 */
		BUG_ON(!result->d_inode);
		d_instantiate(dentry, result->d_inode);
		return 0;
	}
	return PTR_ERR(result);
}

static int ceph_mknod(struct inode *dir, struct dentry *dentry,
A
Al Viro 已提交
669
		      umode_t mode, dev_t rdev)
S
Sage Weil 已提交
670
{
671 672
	struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
	struct ceph_mds_client *mdsc = fsc->mdsc;
S
Sage Weil 已提交
673 674 675 676 677 678
	struct ceph_mds_request *req;
	int err;

	if (ceph_snap(dir) != CEPH_NOSNAP)
		return -EROFS;

A
Al Viro 已提交
679
	dout("mknod in dir %p dentry %p mode 0%ho rdev %d\n",
S
Sage Weil 已提交
680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701
	     dir, dentry, mode, rdev);
	req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_MKNOD, USE_AUTH_MDS);
	if (IS_ERR(req)) {
		d_drop(dentry);
		return PTR_ERR(req);
	}
	req->r_dentry = dget(dentry);
	req->r_num_caps = 2;
	req->r_locked_dir = dir;
	req->r_args.mknod.mode = cpu_to_le32(mode);
	req->r_args.mknod.rdev = cpu_to_le32(rdev);
	req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
	req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
	err = ceph_mdsc_do_request(mdsc, dir, req);
	if (!err && !req->r_reply_info.head->is_dentry)
		err = ceph_handle_notrace_create(dir, dentry);
	ceph_mdsc_put_request(req);
	if (err)
		d_drop(dentry);
	return err;
}

A
Al Viro 已提交
702
static int ceph_create(struct inode *dir, struct dentry *dentry, umode_t mode,
S
Sage Weil 已提交
703 704 705 706 707 708 709 710 711 712
		       struct nameidata *nd)
{
	dout("create in dir %p dentry %p name '%.*s'\n",
	     dir, dentry, dentry->d_name.len, dentry->d_name.name);

	if (ceph_snap(dir) != CEPH_NOSNAP)
		return -EROFS;

	if (nd) {
		BUG_ON((nd->flags & LOOKUP_OPEN) == 0);
713
		dentry = ceph_lookup_open(dir, dentry, nd, mode);
S
Sage Weil 已提交
714 715 716 717 718 719 720 721 722 723 724 725 726
		/* hrm, what should i do here if we get aliased? */
		if (IS_ERR(dentry))
			return PTR_ERR(dentry);
		return 0;
	}

	/* fall back to mknod */
	return ceph_mknod(dir, dentry, (mode & ~S_IFMT) | S_IFREG, 0);
}

static int ceph_symlink(struct inode *dir, struct dentry *dentry,
			    const char *dest)
{
727 728
	struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
	struct ceph_mds_client *mdsc = fsc->mdsc;
S
Sage Weil 已提交
729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755
	struct ceph_mds_request *req;
	int err;

	if (ceph_snap(dir) != CEPH_NOSNAP)
		return -EROFS;

	dout("symlink in dir %p dentry %p to '%s'\n", dir, dentry, dest);
	req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SYMLINK, USE_AUTH_MDS);
	if (IS_ERR(req)) {
		d_drop(dentry);
		return PTR_ERR(req);
	}
	req->r_dentry = dget(dentry);
	req->r_num_caps = 2;
	req->r_path2 = kstrdup(dest, GFP_NOFS);
	req->r_locked_dir = dir;
	req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
	req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
	err = ceph_mdsc_do_request(mdsc, dir, req);
	if (!err && !req->r_reply_info.head->is_dentry)
		err = ceph_handle_notrace_create(dir, dentry);
	ceph_mdsc_put_request(req);
	if (err)
		d_drop(dentry);
	return err;
}

756
static int ceph_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
S
Sage Weil 已提交
757
{
758 759
	struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
	struct ceph_mds_client *mdsc = fsc->mdsc;
S
Sage Weil 已提交
760 761 762 763 764 765 766 767 768 769
	struct ceph_mds_request *req;
	int err = -EROFS;
	int op;

	if (ceph_snap(dir) == CEPH_SNAPDIR) {
		/* mkdir .snap/foo is a MKSNAP */
		op = CEPH_MDS_OP_MKSNAP;
		dout("mksnap dir %p snap '%.*s' dn %p\n", dir,
		     dentry->d_name.len, dentry->d_name.name, dentry);
	} else if (ceph_snap(dir) == CEPH_NOSNAP) {
770
		dout("mkdir dir %p dn %p mode 0%ho\n", dir, dentry, mode);
S
Sage Weil 已提交
771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799
		op = CEPH_MDS_OP_MKDIR;
	} else {
		goto out;
	}
	req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS);
	if (IS_ERR(req)) {
		err = PTR_ERR(req);
		goto out;
	}

	req->r_dentry = dget(dentry);
	req->r_num_caps = 2;
	req->r_locked_dir = dir;
	req->r_args.mkdir.mode = cpu_to_le32(mode);
	req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
	req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
	err = ceph_mdsc_do_request(mdsc, dir, req);
	if (!err && !req->r_reply_info.head->is_dentry)
		err = ceph_handle_notrace_create(dir, dentry);
	ceph_mdsc_put_request(req);
out:
	if (err < 0)
		d_drop(dentry);
	return err;
}

static int ceph_link(struct dentry *old_dentry, struct inode *dir,
		     struct dentry *dentry)
{
800 801
	struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
	struct ceph_mds_client *mdsc = fsc->mdsc;
S
Sage Weil 已提交
802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817
	struct ceph_mds_request *req;
	int err;

	if (ceph_snap(dir) != CEPH_NOSNAP)
		return -EROFS;

	dout("link in dir %p old_dentry %p dentry %p\n", dir,
	     old_dentry, dentry);
	req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_LINK, USE_AUTH_MDS);
	if (IS_ERR(req)) {
		d_drop(dentry);
		return PTR_ERR(req);
	}
	req->r_dentry = dget(dentry);
	req->r_num_caps = 2;
	req->r_old_dentry = dget(old_dentry); /* or inode? hrm. */
818
	req->r_old_dentry_dir = ceph_get_dentry_parent_inode(old_dentry);
S
Sage Weil 已提交
819 820 821 822
	req->r_locked_dir = dir;
	req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
	req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
	err = ceph_mdsc_do_request(mdsc, dir, req);
823
	if (err) {
S
Sage Weil 已提交
824
		d_drop(dentry);
825 826 827 828
	} else if (!req->r_reply_info.head->is_dentry) {
		ihold(old_dentry->d_inode);
		d_instantiate(dentry, old_dentry->d_inode);
	}
S
Sage Weil 已提交
829 830 831 832 833 834 835 836 837 838 839 840 841 842 843
	ceph_mdsc_put_request(req);
	return err;
}

/*
 * For a soon-to-be unlinked file, drop the AUTH_RDCACHE caps.  If it
 * looks like the link count will hit 0, drop any other caps (other
 * than PIN) we don't specifically want (due to the file still being
 * open).
 */
static int drop_caps_for_unlink(struct inode *inode)
{
	struct ceph_inode_info *ci = ceph_inode(inode);
	int drop = CEPH_CAP_LINK_SHARED | CEPH_CAP_LINK_EXCL;

844
	spin_lock(&ci->i_ceph_lock);
S
Sage Weil 已提交
845 846 847 848
	if (inode->i_nlink == 1) {
		drop |= ~(__ceph_caps_wanted(ci) | CEPH_CAP_PIN);
		ci->i_ceph_flags |= CEPH_I_NODELAY;
	}
849
	spin_unlock(&ci->i_ceph_lock);
S
Sage Weil 已提交
850 851 852 853 854 855 856 857
	return drop;
}

/*
 * rmdir and unlink are differ only by the metadata op code
 */
static int ceph_unlink(struct inode *dir, struct dentry *dentry)
{
858 859
	struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
	struct ceph_mds_client *mdsc = fsc->mdsc;
S
Sage Weil 已提交
860 861 862 863 864 865 866 867 868 869 870 871 872
	struct inode *inode = dentry->d_inode;
	struct ceph_mds_request *req;
	int err = -EROFS;
	int op;

	if (ceph_snap(dir) == CEPH_SNAPDIR) {
		/* rmdir .snap/foo is RMSNAP */
		dout("rmsnap dir %p '%.*s' dn %p\n", dir, dentry->d_name.len,
		     dentry->d_name.name, dentry);
		op = CEPH_MDS_OP_RMSNAP;
	} else if (ceph_snap(dir) == CEPH_NOSNAP) {
		dout("unlink/rmdir dir %p dn %p inode %p\n",
		     dir, dentry, inode);
A
Al Viro 已提交
873
		op = S_ISDIR(dentry->d_inode->i_mode) ?
S
Sage Weil 已提交
874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898
			CEPH_MDS_OP_RMDIR : CEPH_MDS_OP_UNLINK;
	} else
		goto out;
	req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS);
	if (IS_ERR(req)) {
		err = PTR_ERR(req);
		goto out;
	}
	req->r_dentry = dget(dentry);
	req->r_num_caps = 2;
	req->r_locked_dir = dir;
	req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
	req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
	req->r_inode_drop = drop_caps_for_unlink(inode);
	err = ceph_mdsc_do_request(mdsc, dir, req);
	if (!err && !req->r_reply_info.head->is_dentry)
		d_delete(dentry);
	ceph_mdsc_put_request(req);
out:
	return err;
}

static int ceph_rename(struct inode *old_dir, struct dentry *old_dentry,
		       struct inode *new_dir, struct dentry *new_dentry)
{
899 900
	struct ceph_fs_client *fsc = ceph_sb_to_client(old_dir->i_sb);
	struct ceph_mds_client *mdsc = fsc->mdsc;
S
Sage Weil 已提交
901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916
	struct ceph_mds_request *req;
	int err;

	if (ceph_snap(old_dir) != ceph_snap(new_dir))
		return -EXDEV;
	if (ceph_snap(old_dir) != CEPH_NOSNAP ||
	    ceph_snap(new_dir) != CEPH_NOSNAP)
		return -EROFS;
	dout("rename dir %p dentry %p to dir %p dentry %p\n",
	     old_dir, old_dentry, new_dir, new_dentry);
	req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_RENAME, USE_AUTH_MDS);
	if (IS_ERR(req))
		return PTR_ERR(req);
	req->r_dentry = dget(new_dentry);
	req->r_num_caps = 2;
	req->r_old_dentry = dget(old_dentry);
917
	req->r_old_dentry_dir = ceph_get_dentry_parent_inode(old_dentry);
S
Sage Weil 已提交
918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933
	req->r_locked_dir = new_dir;
	req->r_old_dentry_drop = CEPH_CAP_FILE_SHARED;
	req->r_old_dentry_unless = CEPH_CAP_FILE_EXCL;
	req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
	req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
	/* release LINK_RDCACHE on source inode (mds will lock it) */
	req->r_old_inode_drop = CEPH_CAP_LINK_SHARED;
	if (new_dentry->d_inode)
		req->r_inode_drop = drop_caps_for_unlink(new_dentry->d_inode);
	err = ceph_mdsc_do_request(mdsc, old_dir, req);
	if (!err && !req->r_reply_info.head->is_dentry) {
		/*
		 * Normally d_move() is done by fill_trace (called by
		 * do_request, above).  If there is no trace, we need
		 * to do it here.
		 */
934 935

		/* d_move screws up d_subdirs order */
S
Sage Weil 已提交
936
		ceph_dir_clear_complete(new_dir);
937

S
Sage Weil 已提交
938
		d_move(old_dentry, new_dentry);
939 940 941

		/* ensure target dentry is invalidated, despite
		   rehashing bug in vfs_rename_dir */
942
		ceph_invalidate_dentry_lease(new_dentry);
S
Sage Weil 已提交
943 944 945 946 947
	}
	ceph_mdsc_put_request(req);
	return err;
}

948 949 950 951 952 953 954 955 956 957
/*
 * Ensure a dentry lease will no longer revalidate.
 */
void ceph_invalidate_dentry_lease(struct dentry *dentry)
{
	spin_lock(&dentry->d_lock);
	dentry->d_time = jiffies;
	ceph_dentry(dentry)->lease_shared_gen = 0;
	spin_unlock(&dentry->d_lock);
}
S
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958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975

/*
 * Check if dentry lease is valid.  If not, delete the lease.  Try to
 * renew if the least is more than half up.
 */
static int dentry_lease_is_valid(struct dentry *dentry)
{
	struct ceph_dentry_info *di;
	struct ceph_mds_session *s;
	int valid = 0;
	u32 gen;
	unsigned long ttl;
	struct ceph_mds_session *session = NULL;
	struct inode *dir = NULL;
	u32 seq = 0;

	spin_lock(&dentry->d_lock);
	di = ceph_dentry(dentry);
976
	if (di->lease_session) {
S
Sage Weil 已提交
977
		s = di->lease_session;
978
		spin_lock(&s->s_gen_ttl_lock);
S
Sage Weil 已提交
979 980
		gen = s->s_cap_gen;
		ttl = s->s_cap_ttl;
981
		spin_unlock(&s->s_gen_ttl_lock);
S
Sage Weil 已提交
982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017

		if (di->lease_gen == gen &&
		    time_before(jiffies, dentry->d_time) &&
		    time_before(jiffies, ttl)) {
			valid = 1;
			if (di->lease_renew_after &&
			    time_after(jiffies, di->lease_renew_after)) {
				/* we should renew */
				dir = dentry->d_parent->d_inode;
				session = ceph_get_mds_session(s);
				seq = di->lease_seq;
				di->lease_renew_after = 0;
				di->lease_renew_from = jiffies;
			}
		}
	}
	spin_unlock(&dentry->d_lock);

	if (session) {
		ceph_mdsc_lease_send_msg(session, dir, dentry,
					 CEPH_MDS_LEASE_RENEW, seq);
		ceph_put_mds_session(session);
	}
	dout("dentry_lease_is_valid - dentry %p = %d\n", dentry, valid);
	return valid;
}

/*
 * Check if directory-wide content lease/cap is valid.
 */
static int dir_lease_is_valid(struct inode *dir, struct dentry *dentry)
{
	struct ceph_inode_info *ci = ceph_inode(dir);
	struct ceph_dentry_info *di = ceph_dentry(dentry);
	int valid = 0;

1018
	spin_lock(&ci->i_ceph_lock);
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	if (ci->i_shared_gen == di->lease_shared_gen)
		valid = __ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1);
1021
	spin_unlock(&ci->i_ceph_lock);
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	dout("dir_lease_is_valid dir %p v%u dentry %p v%u = %d\n",
	     dir, (unsigned)ci->i_shared_gen, dentry,
	     (unsigned)di->lease_shared_gen, valid);
	return valid;
}

/*
 * Check if cached dentry can be trusted.
 */
static int ceph_d_revalidate(struct dentry *dentry, struct nameidata *nd)
{
1033
	int valid = 0;
1034 1035
	struct inode *dir;

1036
	if (nd && nd->flags & LOOKUP_RCU)
1037 1038
		return -ECHILD;

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	dout("d_revalidate %p '%.*s' inode %p offset %lld\n", dentry,
	     dentry->d_name.len, dentry->d_name.name, dentry->d_inode,
	     ceph_dentry(dentry)->offset);
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1043 1044
	dir = ceph_get_dentry_parent_inode(dentry);

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	/* always trust cached snapped dentries, snapdir dentry */
	if (ceph_snap(dir) != CEPH_NOSNAP) {
		dout("d_revalidate %p '%.*s' inode %p is SNAPPED\n", dentry,
		     dentry->d_name.len, dentry->d_name.name, dentry->d_inode);
1049 1050 1051 1052 1053 1054 1055
		valid = 1;
	} else if (dentry->d_inode &&
		   ceph_snap(dentry->d_inode) == CEPH_SNAPDIR) {
		valid = 1;
	} else if (dentry_lease_is_valid(dentry) ||
		   dir_lease_is_valid(dir, dentry)) {
		valid = 1;
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	}

1058 1059 1060 1061 1062 1063 1064
	dout("d_revalidate %p %s\n", dentry, valid ? "valid" : "invalid");
	if (valid)
		ceph_dentry_lru_touch(dentry);
	else
		d_drop(dentry);
	iput(dir);
	return valid;
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}

/*
1068
 * Release our ceph_dentry_info.
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 */
1070
static void ceph_d_release(struct dentry *dentry)
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{
	struct ceph_dentry_info *di = ceph_dentry(dentry);

1074
	dout("d_release %p\n", dentry);
1075 1076 1077 1078 1079
	ceph_dentry_lru_del(dentry);
	if (di->lease_session)
		ceph_put_mds_session(di->lease_session);
	kmem_cache_free(ceph_dentry_cachep, di);
	dentry->d_fsdata = NULL;
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}

static int ceph_snapdir_d_revalidate(struct dentry *dentry,
					  struct nameidata *nd)
{
	/*
	 * Eventually, we'll want to revalidate snapped metadata
	 * too... probably...
	 */
	return 1;
}

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/*
 * Set/clear/test dir complete flag on the dir's dentry.
 */
void ceph_dir_set_complete(struct inode *inode)
{
1097 1098 1099 1100 1101 1102 1103 1104
	struct dentry *dentry = d_find_any_alias(inode);
	
	if (dentry && ceph_dentry(dentry) &&
	    ceph_test_mount_opt(ceph_sb_to_client(dentry->d_sb), DCACHE)) {
		dout(" marking %p (%p) complete\n", inode, dentry);
		set_bit(CEPH_D_COMPLETE, &ceph_dentry(dentry)->flags);
	}
	dput(dentry);
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}

void ceph_dir_clear_complete(struct inode *inode)
{
1109 1110 1111 1112 1113 1114 1115
	struct dentry *dentry = d_find_any_alias(inode);

	if (dentry && ceph_dentry(dentry)) {
		dout(" marking %p (%p) complete\n", inode, dentry);
		set_bit(CEPH_D_COMPLETE, &ceph_dentry(dentry)->flags);
	}
	dput(dentry);
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}

bool ceph_dir_test_complete(struct inode *inode)
{
1120 1121 1122 1123 1124 1125 1126
	struct dentry *dentry = d_find_any_alias(inode);

	if (dentry && ceph_dentry(dentry)) {
		dout(" marking %p (%p) NOT complete\n", inode, dentry);
		clear_bit(CEPH_D_COMPLETE, &ceph_dentry(dentry)->flags);
	}
	dput(dentry);
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	return false;
}

1130 1131 1132 1133 1134 1135 1136 1137 1138 1139
/*
 * When the VFS prunes a dentry from the cache, we need to clear the
 * complete flag on the parent directory.
 *
 * Called under dentry->d_lock.
 */
static void ceph_d_prune(struct dentry *dentry)
{
	struct ceph_dentry_info *di;

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	dout("ceph_d_prune %p\n", dentry);
1141 1142 1143 1144 1145 1146 1147 1148

	/* do we have a valid parent? */
	if (!dentry->d_parent || IS_ROOT(dentry))
		return;

	/* if we are not hashed, we don't affect D_COMPLETE */
	if (d_unhashed(dentry))
		return;
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1150 1151 1152 1153 1154 1155 1156
	/*
	 * we hold d_lock, so d_parent is stable, and d_fsdata is never
	 * cleared until d_release
	 */
	di = ceph_dentry(dentry->d_parent);
	clear_bit(CEPH_D_COMPLETE, &di->flags);
}
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/*
 * read() on a dir.  This weird interface hack only works if mounted
 * with '-o dirstat'.
 */
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 inode *inode = file->f_dentry->d_inode;
	struct ceph_inode_info *ci = ceph_inode(inode);
	int left;
1169
	const int bufsize = 1024;
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1171
	if (!ceph_test_mount_opt(ceph_sb_to_client(inode->i_sb), DIRSTAT))
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		return -EISDIR;

	if (!cf->dir_info) {
1175
		cf->dir_info = kmalloc(bufsize, GFP_NOFS);
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		if (!cf->dir_info)
			return -ENOMEM;
		cf->dir_info_len =
1179
			snprintf(cf->dir_info, bufsize,
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				"entries:   %20lld\n"
				" files:    %20lld\n"
				" subdirs:  %20lld\n"
				"rentries:  %20lld\n"
				" rfiles:   %20lld\n"
				" rsubdirs: %20lld\n"
				"rbytes:    %20lld\n"
				"rctime:    %10ld.%09ld\n",
				ci->i_files + ci->i_subdirs,
				ci->i_files,
				ci->i_subdirs,
				ci->i_rfiles + ci->i_rsubdirs,
				ci->i_rfiles,
				ci->i_rsubdirs,
				ci->i_rbytes,
				(long)ci->i_rctime.tv_sec,
				(long)ci->i_rctime.tv_nsec);
	}

	if (*ppos >= cf->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);
	if (left == size)
		return -EFAULT;
	*ppos += (size - left);
	return size - left;
}

/*
 * an fsync() on a dir will wait for any uncommitted directory
 * operations to commit.
 */
1213 1214
static int ceph_dir_fsync(struct file *file, loff_t start, loff_t end,
			  int datasync)
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{
1216
	struct inode *inode = file->f_path.dentry->d_inode;
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	struct ceph_inode_info *ci = ceph_inode(inode);
	struct list_head *head = &ci->i_unsafe_dirops;
	struct ceph_mds_request *req;
	u64 last_tid;
	int ret = 0;

	dout("dir_fsync %p\n", inode);
1224 1225 1226 1227 1228
	ret = filemap_write_and_wait_range(inode->i_mapping, start, end);
	if (ret)
		return ret;
	mutex_lock(&inode->i_mutex);

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	spin_lock(&ci->i_unsafe_lock);
	if (list_empty(head))
		goto out;

	req = list_entry(head->prev,
			 struct ceph_mds_request, r_unsafe_dir_item);
	last_tid = req->r_tid;

	do {
		ceph_mdsc_get_request(req);
		spin_unlock(&ci->i_unsafe_lock);
1240

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		dout("dir_fsync %p wait on tid %llu (until %llu)\n",
		     inode, req->r_tid, last_tid);
		if (req->r_timeout) {
			ret = wait_for_completion_timeout(
				&req->r_safe_completion, req->r_timeout);
			if (ret > 0)
				ret = 0;
			else if (ret == 0)
				ret = -EIO;  /* timed out */
		} else {
			wait_for_completion(&req->r_safe_completion);
		}
		ceph_mdsc_put_request(req);

1255
		spin_lock(&ci->i_unsafe_lock);
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1256 1257 1258 1259 1260 1261 1262
		if (ret || list_empty(head))
			break;
		req = list_entry(head->next,
				 struct ceph_mds_request, r_unsafe_dir_item);
	} while (req->r_tid < last_tid);
out:
	spin_unlock(&ci->i_unsafe_lock);
1263 1264
	mutex_unlock(&inode->i_mutex);

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	return ret;
}

/*
 * We maintain a private dentry LRU.
 *
 * FIXME: this needs to be changed to a per-mds lru to be useful.
 */
void ceph_dentry_lru_add(struct dentry *dn)
{
	struct ceph_dentry_info *di = ceph_dentry(dn);
	struct ceph_mds_client *mdsc;

1278 1279
	dout("dentry_lru_add %p %p '%.*s'\n", di, dn,
	     dn->d_name.len, dn->d_name.name);
1280 1281 1282 1283 1284
	mdsc = ceph_sb_to_client(dn->d_sb)->mdsc;
	spin_lock(&mdsc->dentry_lru_lock);
	list_add_tail(&di->lru, &mdsc->dentry_lru);
	mdsc->num_dentry++;
	spin_unlock(&mdsc->dentry_lru_lock);
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}

void ceph_dentry_lru_touch(struct dentry *dn)
{
	struct ceph_dentry_info *di = ceph_dentry(dn);
	struct ceph_mds_client *mdsc;

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	dout("dentry_lru_touch %p %p '%.*s' (offset %lld)\n", di, dn,
	     dn->d_name.len, dn->d_name.name, di->offset);
1294 1295 1296 1297
	mdsc = ceph_sb_to_client(dn->d_sb)->mdsc;
	spin_lock(&mdsc->dentry_lru_lock);
	list_move_tail(&di->lru, &mdsc->dentry_lru);
	spin_unlock(&mdsc->dentry_lru_lock);
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1298 1299 1300 1301 1302 1303 1304
}

void ceph_dentry_lru_del(struct dentry *dn)
{
	struct ceph_dentry_info *di = ceph_dentry(dn);
	struct ceph_mds_client *mdsc;

1305 1306
	dout("dentry_lru_del %p %p '%.*s'\n", di, dn,
	     dn->d_name.len, dn->d_name.name);
1307 1308 1309 1310 1311
	mdsc = ceph_sb_to_client(dn->d_sb)->mdsc;
	spin_lock(&mdsc->dentry_lru_lock);
	list_del_init(&di->lru);
	mdsc->num_dentry--;
	spin_unlock(&mdsc->dentry_lru_lock);
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1312 1313
}

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1314 1315 1316 1317
/*
 * Return name hash for a given dentry.  This is dependent on
 * the parent directory's hash function.
 */
1318
unsigned ceph_dentry_hash(struct inode *dir, struct dentry *dn)
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{
	struct ceph_inode_info *dci = ceph_inode(dir);

	switch (dci->i_dir_layout.dl_dir_hash) {
	case 0:	/* for backward compat */
	case CEPH_STR_HASH_LINUX:
		return dn->d_name.hash;

	default:
		return ceph_str_hash(dci->i_dir_layout.dl_dir_hash,
				     dn->d_name.name, dn->d_name.len);
	}
}

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1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361
const struct file_operations ceph_dir_fops = {
	.read = ceph_read_dir,
	.readdir = ceph_readdir,
	.llseek = ceph_dir_llseek,
	.open = ceph_open,
	.release = ceph_release,
	.unlocked_ioctl = ceph_ioctl,
	.fsync = ceph_dir_fsync,
};

const struct inode_operations ceph_dir_iops = {
	.lookup = ceph_lookup,
	.permission = ceph_permission,
	.getattr = ceph_getattr,
	.setattr = ceph_setattr,
	.setxattr = ceph_setxattr,
	.getxattr = ceph_getxattr,
	.listxattr = ceph_listxattr,
	.removexattr = ceph_removexattr,
	.mknod = ceph_mknod,
	.symlink = ceph_symlink,
	.mkdir = ceph_mkdir,
	.link = ceph_link,
	.unlink = ceph_unlink,
	.rmdir = ceph_unlink,
	.rename = ceph_rename,
	.create = ceph_create,
};

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1362
const struct dentry_operations ceph_dentry_ops = {
S
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1363
	.d_revalidate = ceph_d_revalidate,
1364
	.d_release = ceph_d_release,
1365
	.d_prune = ceph_d_prune,
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1366 1367
};

S
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1368
const struct dentry_operations ceph_snapdir_dentry_ops = {
S
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1369
	.d_revalidate = ceph_snapdir_d_revalidate,
1370
	.d_release = ceph_d_release,
S
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1371 1372
};

S
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1373
const struct dentry_operations ceph_snap_dentry_ops = {
1374
	.d_release = ceph_d_release,
1375
	.d_prune = ceph_d_prune,
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1376
};