dir.c 36.4 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 (ceph_snap(dentry->d_parent->d_inode) == CEPH_NOSNAP)
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		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);
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	if (!IS_ROOT(dentry)) {
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		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;
}

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static int fpos_cmp(loff_t l, loff_t r)
{
	int v = ceph_frag_compare(fpos_frag(l), fpos_frag(r));
	if (v)
		return v;
	return (int)(fpos_off(l) - fpos_off(r));
}

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/*
 * 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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 * Complete dir indicates that 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).
 */
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static int __dcache_readdir(struct file *file,  struct dir_context *ctx,
			    u32 shared_gen)
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{
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	struct ceph_file_info *fi = file->private_data;
	struct dentry *parent = file->f_dentry;
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	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;

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	dout("__dcache_readdir %p v%u at %llu (last %p)\n",
	     dir, shared_gen, ctx->pos, last);
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	spin_lock(&parent->d_lock);
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	/* start at beginning? */
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	if (ctx->pos == 2 || last == NULL ||
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	    fpos_cmp(ctx->pos, ceph_dentry(last)->offset) < 0) {
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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 (di->lease_shared_gen == shared_gen &&
		    !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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		    fpos_cmp(ctx->pos, di->offset) <= 0)
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			break;
		dout(" skipping %p %.*s at %llu (%llu)%s%s\n", dentry,
		     dentry->d_name.len, dentry->d_name.name, di->offset,
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		     ctx->pos, d_unhashed(dentry) ? " unhashed" : "",
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		     !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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	/* make sure a dentry wasn't dropped while we didn't have parent lock */
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	if (!ceph_dir_is_complete_ordered(dir)) {
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		dout(" lost dir complete on %p; falling back to mds\n", dir);
		dput(dentry);
		err = -EAGAIN;
		goto out;
	}

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	dout(" %llu (%llu) dentry %p %.*s %p\n", di->offset, ctx->pos,
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	     dentry, dentry->d_name.len, dentry->d_name.name, dentry->d_inode);
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	if (!dir_emit(ctx, dentry->d_name.name,
		      dentry->d_name.len,
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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) {
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			/* remember our position */
			fi->dentry = last;
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			fi->next_offset = fpos_off(di->offset);
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		}
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		dput(dentry);
		return 0;
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	}
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	ctx->pos = di->offset + 1;

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	if (last)
		dput(last);
	last = dentry;
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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;
}

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static int ceph_readdir(struct file *file, struct dir_context *ctx)
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{
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	struct ceph_file_info *fi = file->private_data;
	struct inode *inode = file_inode(file);
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	struct ceph_inode_info *ci = ceph_inode(inode);
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	struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
	struct ceph_mds_client *mdsc = fsc->mdsc;
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	unsigned frag = fpos_frag(ctx->pos);
	int off = fpos_off(ctx->pos);
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	int err;
	u32 ftype;
	struct ceph_mds_reply_info_parsed *rinfo;

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	dout("readdir %p file %p frag %u off %u\n", inode, file, frag, off);
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	if (fi->flags & CEPH_F_ATEND)
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		return 0;

	/* always start with . and .. */
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	if (ctx->pos == 0) {
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		dout("readdir off 0 -> '.'\n");
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		if (!dir_emit(ctx, ".", 1, 
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			    ceph_translate_ino(inode->i_sb, inode->i_ino),
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			    inode->i_mode >> 12))
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			return 0;
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		ctx->pos = 1;
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		off = 1;
	}
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	if (ctx->pos == 1) {
		ino_t ino = parent_ino(file->f_dentry);
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		dout("readdir off 1 -> '..'\n");
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		if (!dir_emit(ctx, "..", 2,
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			    ceph_translate_ino(inode->i_sb, ino),
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			    inode->i_mode >> 12))
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			return 0;
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		ctx->pos = 2;
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		off = 2;
	}

	/* can we use the dcache? */
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	spin_lock(&ci->i_ceph_lock);
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	if ((ctx->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_is_complete_ordered(ci) &&
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	    __ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1)) {
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		u32 shared_gen = ci->i_shared_gen;
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		spin_unlock(&ci->i_ceph_lock);
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		err = __dcache_readdir(file, ctx, shared_gen);
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		if (err != -EAGAIN)
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			return err;
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		frag = fpos_frag(ctx->pos);
		off = fpos_off(ctx->pos);
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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 */

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	if (ctx->pos == 2) {
		/* note dir version at start of readdir so we can tell
		 * if any dentries get dropped */
		fi->dir_release_count = atomic_read(&ci->i_release_count);
		fi->dir_ordered_count = ci->i_ordered_count;
	}

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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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		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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		err = ceph_alloc_readdir_reply_buffer(req, inode);
		if (err) {
			ceph_mdsc_put_request(req);
			return err;
		}
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		req->r_inode = inode;
		ihold(inode);
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		req->r_dentry = dget(file->f_dentry);
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		/* 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);
		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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			/* preclude from marking dir complete */
			fi->dir_release_count--;
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		}

		/* note next offset and last dentry name */
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		rinfo = &req->r_reply_info;
		if (le32_to_cpu(rinfo->dir_dir->frag) != frag) {
			frag = le32_to_cpu(rinfo->dir_dir->frag);
			if (ceph_frag_is_leftmost(frag))
				fi->next_offset = 2;
			else
				fi->next_offset = 0;
			off = fi->next_offset;
		}
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		fi->frag = frag;
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		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 {
			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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	ctx->pos = ceph_make_fpos(frag, off);
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	while (off >= fi->offset && off - fi->offset < rinfo->dir_nr) {
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		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",
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		     off, off - fi->offset, rinfo->dir_nr, ctx->pos,
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		     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 (!dir_emit(ctx,
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			    rinfo->dir_dname[off - fi->offset],
			    rinfo->dir_dname_len[off - fi->offset],
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			    ceph_translate_ino(inode->i_sb, ino), ftype)) {
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			dout("filldir stopping us...\n");
			return 0;
		}
		off++;
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		ctx->pos++;
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	}

	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;
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		ctx->pos = ceph_make_fpos(frag, off);
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		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 (atomic_read(&ci->i_release_count) == fi->dir_release_count) {
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		if (ci->i_ordered_count == fi->dir_ordered_count)
			dout(" marking %p complete and ordered\n", inode);
		else
			dout(" marking %p complete\n", inode);
		__ceph_dir_set_complete(ci, fi->dir_release_count,
					fi->dir_ordered_count);
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	}
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	spin_unlock(&ci->i_ceph_lock);
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	dout("readdir %p file %p done.\n", inode, file);
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	return 0;
}

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static void reset_readdir(struct ceph_file_info *fi, unsigned frag)
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{
	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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	if (ceph_frag_is_leftmost(frag))
		fi->next_offset = 2;  /* compensate for . and .. */
	else
		fi->next_offset = 0;
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	if (fi->dentry) {
		dput(fi->dentry);
		fi->dentry = NULL;
	}
481
	fi->flags &= ~CEPH_F_ATEND;
S
Sage Weil 已提交
482 483
}

484
static loff_t ceph_dir_llseek(struct file *file, loff_t offset, int whence)
S
Sage Weil 已提交
485 486 487
{
	struct ceph_file_info *fi = file->private_data;
	struct inode *inode = file->f_mapping->host;
Y
Yan, Zheng 已提交
488
	loff_t old_offset = ceph_make_fpos(fi->frag, fi->next_offset);
S
Sage Weil 已提交
489 490 491
	loff_t retval;

	mutex_lock(&inode->i_mutex);
492
	retval = -EINVAL;
493
	switch (whence) {
S
Sage Weil 已提交
494 495 496 497 498
	case SEEK_END:
		offset += inode->i_size + 2;   /* FIXME */
		break;
	case SEEK_CUR:
		offset += file->f_pos;
499 500 501 502
	case SEEK_SET:
		break;
	default:
		goto out;
S
Sage Weil 已提交
503
	}
504

Y
Yan, Zheng 已提交
505
	if (offset >= 0) {
S
Sage Weil 已提交
506 507 508
		if (offset != file->f_pos) {
			file->f_pos = offset;
			file->f_version = 0;
509
			fi->flags &= ~CEPH_F_ATEND;
S
Sage Weil 已提交
510 511 512 513 514 515 516 517
		}
		retval = offset;

		/*
		 * discard buffered readdir content on seekdir(0), or
		 * seek to new frag, or seek prior to current chunk.
		 */
		if (offset == 0 ||
Y
Yan, Zheng 已提交
518
		    fpos_frag(offset) != fi->frag ||
S
Sage Weil 已提交
519 520
		    fpos_off(offset) < fi->offset) {
			dout("dir_llseek dropping %p content\n", file);
Y
Yan, Zheng 已提交
521
			reset_readdir(fi, fpos_frag(offset));
S
Sage Weil 已提交
522 523 524
		}

		/* bump dir_release_count if we did a forward seek */
Y
Yan, Zheng 已提交
525
		if (fpos_cmp(offset, old_offset) > 0)
S
Sage Weil 已提交
526 527
			fi->dir_release_count--;
	}
528
out:
S
Sage Weil 已提交
529 530 531 532 533
	mutex_unlock(&inode->i_mutex);
	return retval;
}

/*
534
 * Handle lookups for the hidden .snap directory.
S
Sage Weil 已提交
535
 */
536 537
int ceph_handle_snapdir(struct ceph_mds_request *req,
			struct dentry *dentry, int err)
S
Sage Weil 已提交
538
{
539
	struct ceph_fs_client *fsc = ceph_sb_to_client(dentry->d_sb);
540
	struct inode *parent = dentry->d_parent->d_inode; /* we hold i_mutex */
S
Sage Weil 已提交
541 542 543

	/* .snap dir? */
	if (err == -ENOENT &&
544
	    ceph_snap(parent) == CEPH_NOSNAP &&
545
	    strcmp(dentry->d_name.name,
546
		   fsc->mount_options->snapdir_name) == 0) {
S
Sage Weil 已提交
547 548 549
		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);
550
		BUG_ON(!d_unhashed(dentry));
S
Sage Weil 已提交
551 552 553
		d_add(dentry, inode);
		err = 0;
	}
554 555
	return err;
}
S
Sage Weil 已提交
556

557 558 559 560 561 562 563 564 565 566 567 568 569 570
/*
 * 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
Sage Weil 已提交
571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593
	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
Sage Weil 已提交
594 595 596 597 598 599
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
Sage Weil 已提交
600 601 602 603 604
/*
 * 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,
A
Al Viro 已提交
605
				  unsigned int flags)
S
Sage Weil 已提交
606
{
607 608
	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
609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627
	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);

	/* 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);

628
		spin_lock(&ci->i_ceph_lock);
S
Sage Weil 已提交
629 630
		dout(" dir %p flags are %d\n", dir, ci->i_ceph_flags);
		if (strncmp(dentry->d_name.name,
631
			    fsc->mount_options->snapdir_name,
S
Sage Weil 已提交
632
			    dentry->d_name.len) &&
S
Sage Weil 已提交
633
		    !is_root_ceph_dentry(dir, dentry) &&
634
		    __ceph_dir_is_complete(ci) &&
S
Sage Weil 已提交
635
		    (__ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1))) {
636
			spin_unlock(&ci->i_ceph_lock);
S
Sage Weil 已提交
637 638 639 640 641
			dout(" dir %p complete, -ENOENT\n", dir);
			d_add(dentry, NULL);
			di->lease_shared_gen = ci->i_shared_gen;
			return NULL;
		}
642
		spin_unlock(&ci->i_ceph_lock);
S
Sage Weil 已提交
643 644 645 646 647 648
	}

	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
649
		return ERR_CAST(req);
S
Sage Weil 已提交
650 651 652 653 654 655
	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);
656
	err = ceph_handle_snapdir(req, dentry, err);
S
Sage Weil 已提交
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)
{
A
Al Viro 已提交
669
	struct dentry *result = ceph_lookup(dir, dentry, 0);
S
Sage Weil 已提交
670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686

	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
687
		      umode_t mode, dev_t rdev)
S
Sage Weil 已提交
688
{
689 690
	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
691
	struct ceph_mds_request *req;
692
	struct ceph_acls_info acls = {};
S
Sage Weil 已提交
693 694 695 696 697
	int err;

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

698 699 700 701
	err = ceph_pre_init_acls(dir, &mode, &acls);
	if (err < 0)
		return err;

A
Al Viro 已提交
702
	dout("mknod in dir %p dentry %p mode 0%ho rdev %d\n",
S
Sage Weil 已提交
703 704 705
	     dir, dentry, mode, rdev);
	req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_MKNOD, USE_AUTH_MDS);
	if (IS_ERR(req)) {
706 707
		err = PTR_ERR(req);
		goto out;
S
Sage Weil 已提交
708 709 710 711 712 713 714 715
	}
	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;
716 717 718 719
	if (acls.pagelist) {
		req->r_pagelist = acls.pagelist;
		acls.pagelist = NULL;
	}
S
Sage Weil 已提交
720 721 722 723
	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);
724
out:
G
Guangliang Zhao 已提交
725
	if (!err)
726
		ceph_init_inode_acls(dentry->d_inode, &acls);
727
	else
S
Sage Weil 已提交
728
		d_drop(dentry);
729
	ceph_release_acls_info(&acls);
S
Sage Weil 已提交
730 731 732
	return err;
}

A
Al Viro 已提交
733
static int ceph_create(struct inode *dir, struct dentry *dentry, umode_t mode,
A
Al Viro 已提交
734
		       bool excl)
S
Sage Weil 已提交
735
{
736
	return ceph_mknod(dir, dentry, mode, 0);
S
Sage Weil 已提交
737 738 739 740 741
}

static int ceph_symlink(struct inode *dir, struct dentry *dentry,
			    const char *dest)
{
742 743
	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
744 745 746 747 748 749 750 751 752
	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)) {
753 754
		err = PTR_ERR(req);
		goto out;
S
Sage Weil 已提交
755 756 757 758 759 760 761 762 763 764 765
	}
	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);
766 767
out:
	if (err)
S
Sage Weil 已提交
768 769 770 771
		d_drop(dentry);
	return err;
}

772
static int ceph_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
S
Sage Weil 已提交
773
{
774 775
	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
776
	struct ceph_mds_request *req;
777
	struct ceph_acls_info acls = {};
S
Sage Weil 已提交
778 779 780 781 782 783 784 785 786
	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) {
787
		dout("mkdir dir %p dn %p mode 0%ho\n", dir, dentry, mode);
S
Sage Weil 已提交
788 789 790 791
		op = CEPH_MDS_OP_MKDIR;
	} else {
		goto out;
	}
792 793 794 795 796 797

	mode |= S_IFDIR;
	err = ceph_pre_init_acls(dir, &mode, &acls);
	if (err < 0)
		goto out;

S
Sage Weil 已提交
798 799 800 801 802 803 804 805 806 807 808 809
	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;
810 811 812 813
	if (acls.pagelist) {
		req->r_pagelist = acls.pagelist;
		acls.pagelist = NULL;
	}
S
Sage Weil 已提交
814 815 816 817 818
	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:
819
	if (!err)
820
		ceph_init_inode_acls(dentry->d_inode, &acls);
821
	else
S
Sage Weil 已提交
822
		d_drop(dentry);
823
	ceph_release_acls_info(&acls);
S
Sage Weil 已提交
824 825 826 827 828 829
	return err;
}

static int ceph_link(struct dentry *old_dentry, struct inode *dir,
		     struct dentry *dentry)
{
830 831
	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
832 833 834 835 836 837 838 839 840 841 842 843 844 845 846
	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;
847
	req->r_old_dentry = dget(old_dentry);
S
Sage Weil 已提交
848 849 850
	req->r_locked_dir = dir;
	req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
	req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
851 852
	/* release LINK_SHARED on source inode (mds will lock it) */
	req->r_old_inode_drop = CEPH_CAP_LINK_SHARED;
S
Sage Weil 已提交
853
	err = ceph_mdsc_do_request(mdsc, dir, req);
854
	if (err) {
S
Sage Weil 已提交
855
		d_drop(dentry);
856 857 858 859
	} 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
860 861 862 863 864 865 866 867 868 869 870 871 872 873 874
	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;

875
	spin_lock(&ci->i_ceph_lock);
S
Sage Weil 已提交
876 877 878 879
	if (inode->i_nlink == 1) {
		drop |= ~(__ceph_caps_wanted(ci) | CEPH_CAP_PIN);
		ci->i_ceph_flags |= CEPH_I_NODELAY;
	}
880
	spin_unlock(&ci->i_ceph_lock);
S
Sage Weil 已提交
881 882 883 884 885 886 887 888
	return drop;
}

/*
 * rmdir and unlink are differ only by the metadata op code
 */
static int ceph_unlink(struct inode *dir, struct dentry *dentry)
{
889 890
	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
891 892 893 894 895 896 897 898 899 900 901 902 903
	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
904
		op = S_ISDIR(dentry->d_inode->i_mode) ?
S
Sage Weil 已提交
905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929
			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)
{
930 931
	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
932 933 934 935 936 937 938 939 940 941 942 943 944
	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);
945
	ihold(old_dir);
S
Sage Weil 已提交
946 947 948
	req->r_dentry = dget(new_dentry);
	req->r_num_caps = 2;
	req->r_old_dentry = dget(old_dentry);
949
	req->r_old_dentry_dir = old_dir;
S
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950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965
	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.
		 */
966

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967
		d_move(old_dentry, new_dentry);
968 969 970

		/* ensure target dentry is invalidated, despite
		   rehashing bug in vfs_rename_dir */
971
		ceph_invalidate_dentry_lease(new_dentry);
972 973 974 975 976

		/* d_move screws up sibling dentries' offsets */
		ceph_dir_clear_complete(old_dir);
		ceph_dir_clear_complete(new_dir);

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977 978 979 980 981
	}
	ceph_mdsc_put_request(req);
	return err;
}

982 983 984 985 986 987 988 989 990 991
/*
 * 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);
}
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992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009

/*
 * 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);
1010
	if (di->lease_session) {
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1011
		s = di->lease_session;
1012
		spin_lock(&s->s_gen_ttl_lock);
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1013 1014
		gen = s->s_cap_gen;
		ttl = s->s_cap_ttl;
1015
		spin_unlock(&s->s_gen_ttl_lock);
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1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051

		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;

1052
	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);
1055
	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.
 */
1065
static int ceph_d_revalidate(struct dentry *dentry, unsigned int flags)
S
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1066
{
1067
	int valid = 0;
1068 1069
	struct inode *dir;

1070
	if (flags & LOOKUP_RCU)
1071 1072
		return -ECHILD;

S
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1073 1074 1075
	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);
S
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1076

1077 1078
	dir = ceph_get_dentry_parent_inode(dentry);

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1079 1080 1081 1082
	/* 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);
1083 1084 1085 1086 1087 1088
		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)) {
1089 1090 1091 1092
		if (dentry->d_inode)
			valid = ceph_is_any_caps(dentry->d_inode);
		else
			valid = 1;
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	}

1095
	dout("d_revalidate %p %s\n", dentry, valid ? "valid" : "invalid");
1096
	if (valid) {
1097
		ceph_dentry_lru_touch(dentry);
1098 1099 1100
	} else {
		ceph_dir_clear_complete(dir);
	}
1101 1102
	iput(dir);
	return valid;
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}

/*
1106
 * Release our ceph_dentry_info.
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1107
 */
1108
static void ceph_d_release(struct dentry *dentry)
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1109 1110 1111
{
	struct ceph_dentry_info *di = ceph_dentry(dentry);

1112
	dout("d_release %p\n", dentry);
1113 1114 1115 1116 1117
	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,
1121
					  unsigned int flags)
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1122 1123 1124 1125 1126 1127 1128 1129
{
	/*
	 * Eventually, we'll want to revalidate snapped metadata
	 * too... probably...
	 */
	return 1;
}

1130 1131 1132 1133 1134 1135 1136 1137
/*
 * 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)
{
S
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1138
	dout("ceph_d_prune %p\n", dentry);
1139 1140

	/* do we have a valid parent? */
1141
	if (IS_ROOT(dentry))
1142 1143
		return;

1144
	/* if we are not hashed, we don't affect dir's completeness */
1145 1146
	if (d_unhashed(dentry))
		return;
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1148 1149 1150 1151
	/*
	 * we hold d_lock, so d_parent is stable, and d_fsdata is never
	 * cleared until d_release
	 */
1152
	ceph_dir_clear_complete(dentry->d_parent->d_inode);
1153
}
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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;
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	struct inode *inode = file_inode(file);
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	struct ceph_inode_info *ci = ceph_inode(inode);
	int left;
1166
	const int bufsize = 1024;
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1168
	if (!ceph_test_mount_opt(ceph_sb_to_client(inode->i_sb), DIRSTAT))
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		return -EISDIR;

	if (!cf->dir_info) {
1172
		cf->dir_info = kmalloc(bufsize, GFP_NOFS);
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		if (!cf->dir_info)
			return -ENOMEM;
		cf->dir_info_len =
1176
			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.
 */
1210 1211
static int ceph_dir_fsync(struct file *file, loff_t start, loff_t end,
			  int datasync)
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{
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	struct inode *inode = file_inode(file);
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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);
1221 1222 1223 1224 1225
	ret = filemap_write_and_wait_range(inode->i_mapping, start, end);
	if (ret)
		return ret;
	mutex_lock(&inode->i_mutex);

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1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236
	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);
1237

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1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251
		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);

1252
		spin_lock(&ci->i_unsafe_lock);
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1253 1254 1255 1256 1257 1258 1259
		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);
1260 1261
	mutex_unlock(&inode->i_mutex);

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1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274
	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;

1275 1276
	dout("dentry_lru_add %p %p '%.*s'\n", di, dn,
	     dn->d_name.len, dn->d_name.name);
1277 1278 1279 1280 1281
	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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1282 1283 1284 1285 1286 1287 1288
}

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

S
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1289 1290
	dout("dentry_lru_touch %p %p '%.*s' (offset %lld)\n", di, dn,
	     dn->d_name.len, dn->d_name.name, di->offset);
1291 1292 1293 1294
	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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1295 1296 1297 1298 1299 1300 1301
}

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

1302 1303
	dout("dentry_lru_del %p %p '%.*s'\n", di, dn,
	     dn->d_name.len, dn->d_name.name);
1304 1305 1306 1307 1308
	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);
S
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1309 1310
}

S
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1311 1312 1313 1314
/*
 * Return name hash for a given dentry.  This is dependent on
 * the parent directory's hash function.
 */
1315
unsigned ceph_dentry_hash(struct inode *dir, struct dentry *dn)
S
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1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329
{
	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);
	}
}

S
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1330 1331
const struct file_operations ceph_dir_fops = {
	.read = ceph_read_dir,
A
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1332
	.iterate = ceph_readdir,
S
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1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348
	.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,
G
Guangliang Zhao 已提交
1349
	.get_acl = ceph_get_acl,
S
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1350
	.set_acl = ceph_set_acl,
S
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1351 1352 1353 1354 1355 1356 1357 1358
	.mknod = ceph_mknod,
	.symlink = ceph_symlink,
	.mkdir = ceph_mkdir,
	.link = ceph_link,
	.unlink = ceph_unlink,
	.rmdir = ceph_unlink,
	.rename = ceph_rename,
	.create = ceph_create,
1359
	.atomic_open = ceph_atomic_open,
S
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1360 1361
};

S
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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,
S
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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,
S
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1376
};