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fs/ceph/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;
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  	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)
  {
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  	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)
  ", 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
  ", 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
  ", 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
  ", 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
  ", 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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  	}
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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
  ", 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);
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  	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'
  ", 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
  ", 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 -> '.'
  ");
  		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 -> '..'
  ");
  		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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  	}
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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'
  ",
  		     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
  ", 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
  ", frag,
  	     rinfo->dir_nr, off, fi->offset);
da39822c6   Sage Weil   ceph: fix broken ...
387
  	while (off >= fi->offset && off - fi->offset < rinfo->dir_nr) {
2817b000b   Sage Weil   ceph: directory o...
388
389
390
  		u64 pos = ceph_make_fpos(frag, off);
  		struct ceph_mds_reply_inode *in =
  			rinfo->dir_in[off - fi->offset].in;
3105c19c4   Sage Weil   ceph: fix readdir...
391
392
  		struct ceph_vino vino;
  		ino_t ino;
2817b000b   Sage Weil   ceph: directory o...
393
394
395
396
397
398
399
  		dout("readdir off %d (%d/%d) -> %lld '%.*s' %p
  ",
  		     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;
3105c19c4   Sage Weil   ceph: fix readdir...
400
401
402
  		vino.ino = le64_to_cpu(in->ino);
  		vino.snap = le64_to_cpu(in->snapid);
  		ino = ceph_vino_to_ino(vino);
2817b000b   Sage Weil   ceph: directory o...
403
404
405
  		if (filldir(dirent,
  			    rinfo->dir_dname[off - fi->offset],
  			    rinfo->dir_dname_len[off - fi->offset],
ad1fee96c   Yehuda Sadeh   ceph: add ino32 m...
406
407
  			    pos,
  			    ceph_translate_ino(inode->i_sb, ino), ftype) < 0) {
2817b000b   Sage Weil   ceph: directory o...
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
  			dout("filldir stopping us...
  ");
  			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
  ", frag);
  		goto more;
  	}
9cfa1098d   Sage Weil   ceph: use flag bi...
431
  	fi->flags |= CEPH_F_ATEND;
2817b000b   Sage Weil   ceph: directory o...
432
433
434
435
436
437
  
  	/*
  	 * 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.
  	 */
be655596b   Sage Weil   ceph: use i_ceph_...
438
  	spin_lock(&ci->i_ceph_lock);
2817b000b   Sage Weil   ceph: directory o...
439
  	if (ci->i_release_count == fi->dir_release_count) {
c6ffe1001   Sage Weil   ceph: use new D_C...
440
  		ceph_dir_set_complete(inode);
2817b000b   Sage Weil   ceph: directory o...
441
442
  		ci->i_max_offset = filp->f_pos;
  	}
be655596b   Sage Weil   ceph: use i_ceph_...
443
  	spin_unlock(&ci->i_ceph_lock);
2817b000b   Sage Weil   ceph: directory o...
444
445
446
447
448
449
450
451
452
453
454
455
456
  
  	dout("readdir %p filp %p done.
  ", 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);
a1629c3b2   Sage Weil   ceph: fix danglin...
457
  	fi->last_name = NULL;
2817b000b   Sage Weil   ceph: directory o...
458
459
460
461
462
  	fi->next_offset = 2;  /* compensate for . and .. */
  	if (fi->dentry) {
  		dput(fi->dentry);
  		fi->dentry = NULL;
  	}
9cfa1098d   Sage Weil   ceph: use flag bi...
463
  	fi->flags &= ~CEPH_F_ATEND;
2817b000b   Sage Weil   ceph: directory o...
464
465
466
467
468
469
470
471
472
473
  }
  
  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);
06222e491   Josef Bacik   fs: handle SEEK_H...
474
  	retval = -EINVAL;
2817b000b   Sage Weil   ceph: directory o...
475
476
477
478
479
480
  	switch (origin) {
  	case SEEK_END:
  		offset += inode->i_size + 2;   /* FIXME */
  		break;
  	case SEEK_CUR:
  		offset += file->f_pos;
06222e491   Josef Bacik   fs: handle SEEK_H...
481
482
483
484
  	case SEEK_SET:
  		break;
  	default:
  		goto out;
2817b000b   Sage Weil   ceph: directory o...
485
  	}
06222e491   Josef Bacik   fs: handle SEEK_H...
486

2817b000b   Sage Weil   ceph: directory o...
487
488
489
490
  	if (offset >= 0 && offset <= inode->i_sb->s_maxbytes) {
  		if (offset != file->f_pos) {
  			file->f_pos = offset;
  			file->f_version = 0;
9cfa1098d   Sage Weil   ceph: use flag bi...
491
  			fi->flags &= ~CEPH_F_ATEND;
2817b000b   Sage Weil   ceph: directory o...
492
493
494
495
496
497
498
499
500
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510
  		}
  		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
  ", file);
  			reset_readdir(fi);
  		}
  
  		/* bump dir_release_count if we did a forward seek */
  		if (offset > old_offset)
  			fi->dir_release_count--;
  	}
06222e491   Josef Bacik   fs: handle SEEK_H...
511
  out:
2817b000b   Sage Weil   ceph: directory o...
512
513
514
515
516
  	mutex_unlock(&inode->i_mutex);
  	return retval;
  }
  
  /*
468640e32   Sage Weil   ceph: fix ceph_lo...
517
   * Handle lookups for the hidden .snap directory.
2817b000b   Sage Weil   ceph: directory o...
518
   */
468640e32   Sage Weil   ceph: fix ceph_lo...
519
520
  int ceph_handle_snapdir(struct ceph_mds_request *req,
  			struct dentry *dentry, int err)
2817b000b   Sage Weil   ceph: directory o...
521
  {
3d14c5d2b   Yehuda Sadeh   ceph: factor out ...
522
  	struct ceph_fs_client *fsc = ceph_sb_to_client(dentry->d_sb);
d79698da3   Sage Weil   ceph: document un...
523
  	struct inode *parent = dentry->d_parent->d_inode; /* we hold i_mutex */
2817b000b   Sage Weil   ceph: directory o...
524
525
526
  
  	/* .snap dir? */
  	if (err == -ENOENT &&
455cec0ab   Sage Weil   ceph: no .snap in...
527
  	    ceph_snap(parent) == CEPH_NOSNAP &&
6b8051855   Sage Weil   ceph: allocate an...
528
  	    strcmp(dentry->d_name.name,
3d14c5d2b   Yehuda Sadeh   ceph: factor out ...
529
  		   fsc->mount_options->snapdir_name) == 0) {
2817b000b   Sage Weil   ceph: directory o...
530
531
532
533
  		struct inode *inode = ceph_get_snapdir(parent);
  		dout("ENOENT on snapdir %p '%.*s', linking to snapdir %p
  ",
  		     dentry, dentry->d_name.len, dentry->d_name.name, inode);
9358c6d4c   Sage Weil   ceph: fix dentry ...
534
  		BUG_ON(!d_unhashed(dentry));
2817b000b   Sage Weil   ceph: directory o...
535
536
537
  		d_add(dentry, inode);
  		err = 0;
  	}
468640e32   Sage Weil   ceph: fix ceph_lo...
538
539
  	return err;
  }
2817b000b   Sage Weil   ceph: directory o...
540

468640e32   Sage Weil   ceph: fix ceph_lo...
541
542
543
544
545
546
547
548
549
550
551
552
553
554
  /*
   * 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)
  {
2817b000b   Sage Weil   ceph: directory o...
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
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572
573
574
575
576
577
  	if (err == -ENOENT) {
  		/* no trace? */
  		err = 0;
  		if (!req->r_reply_info.head->is_dentry) {
  			dout("ENOENT and no trace, dentry %p inode %p
  ",
  			     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;
  }
1d1de9160   Sage Weil   ceph: hide /.ceph...
578
579
580
581
582
  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;
  }
2817b000b   Sage Weil   ceph: directory o...
583
584
585
586
587
588
589
  /*
   * 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)
  {
3d14c5d2b   Yehuda Sadeh   ceph: factor out ...
590
591
  	struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
  	struct ceph_mds_client *mdsc = fsc->mdsc;
2817b000b   Sage Weil   ceph: directory o...
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
  	struct ceph_mds_request *req;
  	int op;
  	int err;
  
  	dout("lookup %p dentry %p '%.*s'
  ",
  	     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) &&
2817b000b   Sage Weil   ceph: directory o...
610
611
612
613
614
615
616
617
618
  	    !(nd->intent.open.flags & O_CREAT)) {
  		int mode = nd->intent.open.create_mode & ~current->fs->umask;
  		return ceph_lookup_open(dir, dentry, nd, mode, 1);
  	}
  
  	/* 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);
be655596b   Sage Weil   ceph: use i_ceph_...
619
  		spin_lock(&ci->i_ceph_lock);
2817b000b   Sage Weil   ceph: directory o...
620
621
622
  		dout(" dir %p flags are %d
  ", dir, ci->i_ceph_flags);
  		if (strncmp(dentry->d_name.name,
3d14c5d2b   Yehuda Sadeh   ceph: factor out ...
623
  			    fsc->mount_options->snapdir_name,
2817b000b   Sage Weil   ceph: directory o...
624
  			    dentry->d_name.len) &&
1d1de9160   Sage Weil   ceph: hide /.ceph...
625
  		    !is_root_ceph_dentry(dir, dentry) &&
c6ffe1001   Sage Weil   ceph: use new D_C...
626
  		    ceph_dir_test_complete(dir) &&
2817b000b   Sage Weil   ceph: directory o...
627
  		    (__ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1))) {
be655596b   Sage Weil   ceph: use i_ceph_...
628
  			spin_unlock(&ci->i_ceph_lock);
2817b000b   Sage Weil   ceph: directory o...
629
630
631
632
633
634
  			dout(" dir %p complete, -ENOENT
  ", dir);
  			d_add(dentry, NULL);
  			di->lease_shared_gen = ci->i_shared_gen;
  			return NULL;
  		}
be655596b   Sage Weil   ceph: use i_ceph_...
635
  		spin_unlock(&ci->i_ceph_lock);
2817b000b   Sage Weil   ceph: directory o...
636
637
638
639
640
641
  	}
  
  	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))
7e34bc524   Julia Lawall   fs/ceph: Use ERR_...
642
  		return ERR_CAST(req);
2817b000b   Sage Weil   ceph: directory o...
643
644
645
646
647
648
  	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);
468640e32   Sage Weil   ceph: fix ceph_lo...
649
  	err = ceph_handle_snapdir(req, dentry, err);
2817b000b   Sage Weil   ceph: directory o...
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
  	dentry = ceph_finish_lookup(req, dentry, err);
  	ceph_mdsc_put_request(req);  /* will dput(dentry) */
  	dout("lookup result=%p
  ", 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,
1a67aafb5   Al Viro   switch ->mknod() ...
681
  		      umode_t mode, dev_t rdev)
2817b000b   Sage Weil   ceph: directory o...
682
  {
3d14c5d2b   Yehuda Sadeh   ceph: factor out ...
683
684
  	struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
  	struct ceph_mds_client *mdsc = fsc->mdsc;
2817b000b   Sage Weil   ceph: directory o...
685
686
687
688
689
  	struct ceph_mds_request *req;
  	int err;
  
  	if (ceph_snap(dir) != CEPH_NOSNAP)
  		return -EROFS;
1a67aafb5   Al Viro   switch ->mknod() ...
690
691
  	dout("mknod in dir %p dentry %p mode 0%ho rdev %d
  ",
2817b000b   Sage Weil   ceph: directory o...
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
  	     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;
  }
4acdaf27e   Al Viro   switch ->create()...
713
  static int ceph_create(struct inode *dir, struct dentry *dentry, umode_t mode,
2817b000b   Sage Weil   ceph: directory o...
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
  		       struct nameidata *nd)
  {
  	dout("create in dir %p dentry %p name '%.*s'
  ",
  	     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);
  		dentry = ceph_lookup_open(dir, dentry, nd, mode, 0);
  		/* 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)
  {
3d14c5d2b   Yehuda Sadeh   ceph: factor out ...
739
740
  	struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
  	struct ceph_mds_client *mdsc = fsc->mdsc;
2817b000b   Sage Weil   ceph: directory o...
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
  	struct ceph_mds_request *req;
  	int err;
  
  	if (ceph_snap(dir) != CEPH_NOSNAP)
  		return -EROFS;
  
  	dout("symlink in dir %p dentry %p to '%s'
  ", 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;
  }
18bb1db3e   Al Viro   switch vfs_mkdir(...
768
  static int ceph_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
2817b000b   Sage Weil   ceph: directory o...
769
  {
3d14c5d2b   Yehuda Sadeh   ceph: factor out ...
770
771
  	struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
  	struct ceph_mds_client *mdsc = fsc->mdsc;
2817b000b   Sage Weil   ceph: directory o...
772
773
774
775
776
777
778
779
780
781
782
  	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
  ", dir,
  		     dentry->d_name.len, dentry->d_name.name, dentry);
  	} else if (ceph_snap(dir) == CEPH_NOSNAP) {
18bb1db3e   Al Viro   switch vfs_mkdir(...
783
784
  		dout("mkdir dir %p dn %p mode 0%ho
  ", dir, dentry, mode);
2817b000b   Sage Weil   ceph: directory o...
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
  		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)
  {
3d14c5d2b   Yehuda Sadeh   ceph: factor out ...
814
815
  	struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
  	struct ceph_mds_client *mdsc = fsc->mdsc;
2817b000b   Sage Weil   ceph: directory o...
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
  	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
  ", 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. */
41b02e1f9   Sage Weil   ceph: explicitly ...
833
  	req->r_old_dentry_dir = ceph_get_dentry_parent_inode(old_dentry);
2817b000b   Sage Weil   ceph: directory o...
834
835
836
837
  	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);
70b666c3b   Sage Weil   ceph: use ihold w...
838
  	if (err) {
2817b000b   Sage Weil   ceph: directory o...
839
  		d_drop(dentry);
70b666c3b   Sage Weil   ceph: use ihold w...
840
841
842
843
  	} else if (!req->r_reply_info.head->is_dentry) {
  		ihold(old_dentry->d_inode);
  		d_instantiate(dentry, old_dentry->d_inode);
  	}
2817b000b   Sage Weil   ceph: directory o...
844
845
846
847
848
849
850
851
852
853
854
855
856
857
  	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;
be655596b   Sage Weil   ceph: use i_ceph_...
858
  	spin_lock(&ci->i_ceph_lock);
2817b000b   Sage Weil   ceph: directory o...
859
860
861
862
  	if (inode->i_nlink == 1) {
  		drop |= ~(__ceph_caps_wanted(ci) | CEPH_CAP_PIN);
  		ci->i_ceph_flags |= CEPH_I_NODELAY;
  	}
be655596b   Sage Weil   ceph: use i_ceph_...
863
  	spin_unlock(&ci->i_ceph_lock);
2817b000b   Sage Weil   ceph: directory o...
864
865
866
867
868
869
870
871
  	return drop;
  }
  
  /*
   * rmdir and unlink are differ only by the metadata op code
   */
  static int ceph_unlink(struct inode *dir, struct dentry *dentry)
  {
3d14c5d2b   Yehuda Sadeh   ceph: factor out ...
872
873
  	struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
  	struct ceph_mds_client *mdsc = fsc->mdsc;
2817b000b   Sage Weil   ceph: directory o...
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
  	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
  ", 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
  ",
  		     dir, dentry, inode);
dba19c606   Al Viro   get rid of open-c...
889
  		op = S_ISDIR(dentry->d_inode->i_mode) ?
2817b000b   Sage Weil   ceph: directory o...
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
  			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)
  {
3d14c5d2b   Yehuda Sadeh   ceph: factor out ...
915
916
  	struct ceph_fs_client *fsc = ceph_sb_to_client(old_dir->i_sb);
  	struct ceph_mds_client *mdsc = fsc->mdsc;
2817b000b   Sage Weil   ceph: directory o...
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
  	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
  ",
  	     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);
41b02e1f9   Sage Weil   ceph: explicitly ...
934
  	req->r_old_dentry_dir = ceph_get_dentry_parent_inode(old_dentry);
2817b000b   Sage Weil   ceph: directory o...
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
  	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.
  		 */
ea1409f96   Sage Weil   ceph: clear dir c...
951
952
  
  		/* d_move screws up d_subdirs order */
c6ffe1001   Sage Weil   ceph: use new D_C...
953
  		ceph_dir_clear_complete(new_dir);
ea1409f96   Sage Weil   ceph: clear dir c...
954

2817b000b   Sage Weil   ceph: directory o...
955
  		d_move(old_dentry, new_dentry);
ea1409f96   Sage Weil   ceph: clear dir c...
956
957
958
  
  		/* ensure target dentry is invalidated, despite
  		   rehashing bug in vfs_rename_dir */
81a6cf2d3   Sage Weil   ceph: invalidate ...
959
  		ceph_invalidate_dentry_lease(new_dentry);
2817b000b   Sage Weil   ceph: directory o...
960
961
962
963
  	}
  	ceph_mdsc_put_request(req);
  	return err;
  }
81a6cf2d3   Sage Weil   ceph: invalidate ...
964
965
966
967
968
969
970
971
972
973
  /*
   * 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);
  }
2817b000b   Sage Weil   ceph: directory o...
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
  
  /*
   * 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);
3d8eb7a94   Sage Weil   ceph: remove unne...
992
  	if (di->lease_session) {
2817b000b   Sage Weil   ceph: directory o...
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
  		s = di->lease_session;
  		spin_lock(&s->s_cap_lock);
  		gen = s->s_cap_gen;
  		ttl = s->s_cap_ttl;
  		spin_unlock(&s->s_cap_lock);
  
  		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;
  			}
2817b000b   Sage Weil   ceph: directory o...
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
  		}
  	}
  	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
  ", 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;
be655596b   Sage Weil   ceph: use i_ceph_...
1034
  	spin_lock(&ci->i_ceph_lock);
2817b000b   Sage Weil   ceph: directory o...
1035
1036
  	if (ci->i_shared_gen == di->lease_shared_gen)
  		valid = __ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1);
be655596b   Sage Weil   ceph: use i_ceph_...
1037
  	spin_unlock(&ci->i_ceph_lock);
2817b000b   Sage Weil   ceph: directory o...
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
  	dout("dir_lease_is_valid dir %p v%u dentry %p v%u = %d
  ",
  	     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)
  {
bf1c6aca9   Sage Weil   ceph: protect d_p...
1050
  	int valid = 0;
34286d666   Nick Piggin   fs: rcu-walk awar...
1051
  	struct inode *dir;
0eb980e31   Al Viro   ceph: fix d_reval...
1052
  	if (nd && nd->flags & LOOKUP_RCU)
34286d666   Nick Piggin   fs: rcu-walk awar...
1053
  		return -ECHILD;
1cd3935be   Sage Weil   ceph: set dn offs...
1054
1055
1056
1057
  	dout("d_revalidate %p '%.*s' inode %p offset %lld
  ", dentry,
  	     dentry->d_name.len, dentry->d_name.name, dentry->d_inode,
  	     ceph_dentry(dentry)->offset);
2817b000b   Sage Weil   ceph: directory o...
1058

bf1c6aca9   Sage Weil   ceph: protect d_p...
1059
  	dir = ceph_get_dentry_parent_inode(dentry);
2817b000b   Sage Weil   ceph: directory o...
1060
1061
1062
1063
1064
  	/* always trust cached snapped dentries, snapdir dentry */
  	if (ceph_snap(dir) != CEPH_NOSNAP) {
  		dout("d_revalidate %p '%.*s' inode %p is SNAPPED
  ", dentry,
  		     dentry->d_name.len, dentry->d_name.name, dentry->d_inode);
bf1c6aca9   Sage Weil   ceph: protect d_p...
1065
1066
1067
1068
1069
1070
1071
  		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;
2817b000b   Sage Weil   ceph: directory o...
1072
  	}
2817b000b   Sage Weil   ceph: directory o...
1073

bf1c6aca9   Sage Weil   ceph: protect d_p...
1074
1075
1076
1077
1078
1079
1080
1081
  	dout("d_revalidate %p %s
  ", dentry, valid ? "valid" : "invalid");
  	if (valid)
  		ceph_dentry_lru_touch(dentry);
  	else
  		d_drop(dentry);
  	iput(dir);
  	return valid;
2817b000b   Sage Weil   ceph: directory o...
1082
1083
1084
  }
  
  /*
147851d2d   Sage Weil   ceph: rename dent...
1085
   * Release our ceph_dentry_info.
2817b000b   Sage Weil   ceph: directory o...
1086
   */
147851d2d   Sage Weil   ceph: rename dent...
1087
  static void ceph_d_release(struct dentry *dentry)
2817b000b   Sage Weil   ceph: directory o...
1088
1089
  {
  	struct ceph_dentry_info *di = ceph_dentry(dentry);
2817b000b   Sage Weil   ceph: directory o...
1090

147851d2d   Sage Weil   ceph: rename dent...
1091
1092
  	dout("d_release %p
  ", dentry);
3d8eb7a94   Sage Weil   ceph: remove unne...
1093
1094
1095
1096
1097
  	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;
2817b000b   Sage Weil   ceph: directory o...
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
  }
  
  static int ceph_snapdir_d_revalidate(struct dentry *dentry,
  					  struct nameidata *nd)
  {
  	/*
  	 * Eventually, we'll want to revalidate snapped metadata
  	 * too... probably...
  	 */
  	return 1;
  }
b58dc4100   Sage Weil   ceph: clear paren...
1109
  /*
c6ffe1001   Sage Weil   ceph: use new D_C...
1110
1111
   * Set/clear/test dir complete flag on the dir's dentry.
   */
c6ffe1001   Sage Weil   ceph: use new D_C...
1112
1113
  void ceph_dir_set_complete(struct inode *inode)
  {
a40dc6cc2   Sage Weil   ceph: enable/disa...
1114
1115
1116
1117
1118
1119
1120
1121
1122
  	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
  ", inode, dentry);
  		set_bit(CEPH_D_COMPLETE, &ceph_dentry(dentry)->flags);
  	}
  	dput(dentry);
c6ffe1001   Sage Weil   ceph: use new D_C...
1123
1124
1125
1126
  }
  
  void ceph_dir_clear_complete(struct inode *inode)
  {
a40dc6cc2   Sage Weil   ceph: enable/disa...
1127
1128
1129
1130
1131
1132
1133
1134
  	struct dentry *dentry = d_find_any_alias(inode);
  
  	if (dentry && ceph_dentry(dentry)) {
  		dout(" marking %p (%p) complete
  ", inode, dentry);
  		set_bit(CEPH_D_COMPLETE, &ceph_dentry(dentry)->flags);
  	}
  	dput(dentry);
c6ffe1001   Sage Weil   ceph: use new D_C...
1135
1136
1137
1138
  }
  
  bool ceph_dir_test_complete(struct inode *inode)
  {
a40dc6cc2   Sage Weil   ceph: enable/disa...
1139
1140
1141
1142
1143
1144
1145
1146
  	struct dentry *dentry = d_find_any_alias(inode);
  
  	if (dentry && ceph_dentry(dentry)) {
  		dout(" marking %p (%p) NOT complete
  ", inode, dentry);
  		clear_bit(CEPH_D_COMPLETE, &ceph_dentry(dentry)->flags);
  	}
  	dput(dentry);
c6ffe1001   Sage Weil   ceph: use new D_C...
1147
1148
1149
1150
  	return false;
  }
  
  /*
b58dc4100   Sage Weil   ceph: clear paren...
1151
1152
1153
1154
1155
1156
1157
1158
   * 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;
774ac21da   Sage Weil   ceph: initialize ...
1159
1160
  	dout("ceph_d_prune %p
  ", dentry);
b58dc4100   Sage Weil   ceph: clear paren...
1161
1162
1163
1164
1165
1166
1167
1168
  
  	/* 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;
2817b000b   Sage Weil   ceph: directory o...
1169

b58dc4100   Sage Weil   ceph: clear paren...
1170
1171
1172
1173
1174
1175
1176
  	/*
  	 * 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);
  }
2817b000b   Sage Weil   ceph: directory o...
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
  
  /*
   * 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;
ae5980830   Sage Weil   ceph: use snprint...
1189
  	const int bufsize = 1024;
2817b000b   Sage Weil   ceph: directory o...
1190

3d14c5d2b   Yehuda Sadeh   ceph: factor out ...
1191
  	if (!ceph_test_mount_opt(ceph_sb_to_client(inode->i_sb), DIRSTAT))
2817b000b   Sage Weil   ceph: directory o...
1192
1193
1194
  		return -EISDIR;
  
  	if (!cf->dir_info) {
ae5980830   Sage Weil   ceph: use snprint...
1195
  		cf->dir_info = kmalloc(bufsize, GFP_NOFS);
2817b000b   Sage Weil   ceph: directory o...
1196
1197
1198
  		if (!cf->dir_info)
  			return -ENOMEM;
  		cf->dir_info_len =
ae5980830   Sage Weil   ceph: use snprint...
1199
  			snprintf(cf->dir_info, bufsize,
2817b000b   Sage Weil   ceph: directory o...
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
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1216
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1218
1219
1220
1221
1222
1223
1224
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1227
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1233
1234
1235
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1237
1238
1239
1240
  				"entries:   %20lld
  "
  				" files:    %20lld
  "
  				" subdirs:  %20lld
  "
  				"rentries:  %20lld
  "
  				" rfiles:   %20lld
  "
  				" rsubdirs: %20lld
  "
  				"rbytes:    %20lld
  "
  				"rctime:    %10ld.%09ld
  ",
  				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.
   */
02c24a821   Josef Bacik   fs: push i_mutex ...
1241
1242
  static int ceph_dir_fsync(struct file *file, loff_t start, loff_t end,
  			  int datasync)
2817b000b   Sage Weil   ceph: directory o...
1243
  {
7ea808591   Christoph Hellwig   drop unused dentr...
1244
  	struct inode *inode = file->f_path.dentry->d_inode;
2817b000b   Sage Weil   ceph: directory o...
1245
1246
1247
1248
1249
1250
1251
1252
  	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
  ", inode);
02c24a821   Josef Bacik   fs: push i_mutex ...
1253
1254
1255
1256
  	ret = filemap_write_and_wait_range(inode->i_mapping, start, end);
  	if (ret)
  		return ret;
  	mutex_lock(&inode->i_mutex);
2817b000b   Sage Weil   ceph: directory o...
1257
1258
1259
1260
1261
1262
1263
1264
1265
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1267
  	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);
2ff179e65   Sage Weil   ceph: avoid iput(...
1268

2817b000b   Sage Weil   ceph: directory o...
1269
1270
1271
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1276
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1278
1279
1280
1281
  		dout("dir_fsync %p wait on tid %llu (until %llu)
  ",
  		     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);
  		}
2817b000b   Sage Weil   ceph: directory o...
1282
  		ceph_mdsc_put_request(req);
2ff179e65   Sage Weil   ceph: avoid iput(...
1283
  		spin_lock(&ci->i_unsafe_lock);
2817b000b   Sage Weil   ceph: directory o...
1284
1285
1286
1287
1288
1289
1290
  		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);
02c24a821   Josef Bacik   fs: push i_mutex ...
1291
  	mutex_unlock(&inode->i_mutex);
2817b000b   Sage Weil   ceph: directory o...
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
  	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;
2817b000b   Sage Weil   ceph: directory o...
1304

04a419f90   Sage Weil   ceph: add feature...
1305
1306
1307
  	dout("dentry_lru_add %p %p '%.*s'
  ", di, dn,
  	     dn->d_name.len, dn->d_name.name);
3d8eb7a94   Sage Weil   ceph: remove unne...
1308
1309
1310
1311
1312
  	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);
2817b000b   Sage Weil   ceph: directory o...
1313
1314
1315
1316
1317
1318
  }
  
  void ceph_dentry_lru_touch(struct dentry *dn)
  {
  	struct ceph_dentry_info *di = ceph_dentry(dn);
  	struct ceph_mds_client *mdsc;
2817b000b   Sage Weil   ceph: directory o...
1319

1cd3935be   Sage Weil   ceph: set dn offs...
1320
1321
1322
  	dout("dentry_lru_touch %p %p '%.*s' (offset %lld)
  ", di, dn,
  	     dn->d_name.len, dn->d_name.name, di->offset);
3d8eb7a94   Sage Weil   ceph: remove unne...
1323
1324
1325
1326
  	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);
2817b000b   Sage Weil   ceph: directory o...
1327
1328
1329
1330
1331
1332
  }
  
  void ceph_dentry_lru_del(struct dentry *dn)
  {
  	struct ceph_dentry_info *di = ceph_dentry(dn);
  	struct ceph_mds_client *mdsc;
04a419f90   Sage Weil   ceph: add feature...
1333
1334
1335
  	dout("dentry_lru_del %p %p '%.*s'
  ", di, dn,
  	     dn->d_name.len, dn->d_name.name);
3d8eb7a94   Sage Weil   ceph: remove unne...
1336
1337
1338
1339
1340
  	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);
2817b000b   Sage Weil   ceph: directory o...
1341
  }
6c0f3af72   Sage Weil   ceph: add dir_lay...
1342
1343
1344
1345
  /*
   * Return name hash for a given dentry.  This is dependent on
   * the parent directory's hash function.
   */
e5f86dc37   Sage Weil   ceph: avoid d_par...
1346
  unsigned ceph_dentry_hash(struct inode *dir, struct dentry *dn)
6c0f3af72   Sage Weil   ceph: add dir_lay...
1347
  {
6c0f3af72   Sage Weil   ceph: add dir_lay...
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
  	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);
  	}
  }
2817b000b   Sage Weil   ceph: directory o...
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
  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,
  };
52dfb8ac0   Sage Weil   ceph: constify de...
1388
  const struct dentry_operations ceph_dentry_ops = {
2817b000b   Sage Weil   ceph: directory o...
1389
  	.d_revalidate = ceph_d_revalidate,
147851d2d   Sage Weil   ceph: rename dent...
1390
  	.d_release = ceph_d_release,
b58dc4100   Sage Weil   ceph: clear paren...
1391
  	.d_prune = ceph_d_prune,
2817b000b   Sage Weil   ceph: directory o...
1392
  };
52dfb8ac0   Sage Weil   ceph: constify de...
1393
  const struct dentry_operations ceph_snapdir_dentry_ops = {
2817b000b   Sage Weil   ceph: directory o...
1394
  	.d_revalidate = ceph_snapdir_d_revalidate,
147851d2d   Sage Weil   ceph: rename dent...
1395
  	.d_release = ceph_d_release,
2817b000b   Sage Weil   ceph: directory o...
1396
  };
52dfb8ac0   Sage Weil   ceph: constify de...
1397
  const struct dentry_operations ceph_snap_dentry_ops = {
147851d2d   Sage Weil   ceph: rename dent...
1398
  	.d_release = ceph_d_release,
b58dc4100   Sage Weil   ceph: clear paren...
1399
  	.d_prune = ceph_d_prune,
2817b000b   Sage Weil   ceph: directory o...
1400
  };