c85b224faf
Under Linux a dentry referencing an inode must be instantiated before the inode is unlocked. To accomplish this without overly modifing the core ZFS code the dentry it passed via the vattr_t. There are cases such as replay when a dentry is not available. In which case it is obviously not initialized at inode creation time, if a dentry is needed it will be spliced as when required via d_lookup().
384 lines
8.1 KiB
C
384 lines
8.1 KiB
C
/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License (the "License").
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* You may not use this file except in compliance with the License.
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*
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* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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* or http://www.opensolaris.org/os/licensing.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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* If applicable, add the following below this CDDL HEADER, with the
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* fields enclosed by brackets "[]" replaced with your own identifying
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* information: Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*/
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/*
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* Copyright (c) 2011, Lawrence Livermore National Security, LLC.
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*/
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#include <sys/zfs_vfsops.h>
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#include <sys/zfs_vnops.h>
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#include <sys/vfs.h>
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#include <sys/zpl.h>
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static struct dentry *
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zpl_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
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{
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cred_t *cr = CRED();
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struct inode *ip;
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int error;
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crhold(cr);
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error = -zfs_lookup(dir, dname(dentry), &ip, 0, cr, NULL, NULL);
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ASSERT3S(error, <=, 0);
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crfree(cr);
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if (error) {
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if (error == -ENOENT)
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return d_splice_alias(NULL, dentry);
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else
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return ERR_PTR(error);
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}
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return d_splice_alias(ip, dentry);
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}
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static int
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zpl_create(struct inode *dir, struct dentry *dentry, int mode,
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struct nameidata *nd)
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{
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cred_t *cr = CRED();
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struct inode *ip;
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vattr_t *vap;
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int error;
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crhold(cr);
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vap = kmem_zalloc(sizeof(vattr_t), KM_SLEEP);
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vap->va_mode = mode;
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vap->va_mask = ATTR_MODE;
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vap->va_uid = crgetfsuid(cr);
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vap->va_gid = crgetfsgid(cr);
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vap->va_dentry = dentry;
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error = -zfs_create(dir, (char *)dentry->d_name.name,
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vap, 0, mode, &ip, cr, 0, NULL);
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kmem_free(vap, sizeof(vattr_t));
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crfree(cr);
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ASSERT3S(error, <=, 0);
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return (error);
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}
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static int
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zpl_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t rdev)
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{
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cred_t *cr = CRED();
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struct inode *ip;
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vattr_t *vap;
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int error;
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crhold(cr);
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vap = kmem_zalloc(sizeof(vattr_t), KM_SLEEP);
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vap->va_mode = mode;
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vap->va_mask = ATTR_MODE;
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vap->va_rdev = rdev;
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vap->va_uid = crgetfsuid(cr);
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vap->va_gid = crgetfsgid(cr);
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vap->va_dentry = dentry;
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error = -zfs_create(dir, (char *)dentry->d_name.name,
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vap, 0, mode, &ip, cr, 0, NULL);
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kmem_free(vap, sizeof(vattr_t));
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crfree(cr);
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ASSERT3S(error, <=, 0);
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return (-error);
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}
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static int
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zpl_unlink(struct inode *dir, struct dentry *dentry)
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{
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cred_t *cr = CRED();
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int error;
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crhold(cr);
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error = -zfs_remove(dir, dname(dentry), cr);
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crfree(cr);
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ASSERT3S(error, <=, 0);
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return (error);
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}
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static int
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zpl_mkdir(struct inode *dir, struct dentry *dentry, int mode)
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{
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cred_t *cr = CRED();
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vattr_t *vap;
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struct inode *ip;
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int error;
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crhold(cr);
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vap = kmem_zalloc(sizeof(vattr_t), KM_SLEEP);
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vap->va_mode = S_IFDIR | mode;
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vap->va_mask = ATTR_MODE;
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vap->va_uid = crgetfsuid(cr);
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vap->va_gid = crgetfsgid(cr);
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vap->va_dentry = dentry;
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error = -zfs_mkdir(dir, dname(dentry), vap, &ip, cr, 0, NULL);
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kmem_free(vap, sizeof(vattr_t));
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crfree(cr);
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ASSERT3S(error, <=, 0);
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return (error);
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}
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static int
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zpl_rmdir(struct inode * dir, struct dentry *dentry)
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{
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cred_t *cr = CRED();
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int error;
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crhold(cr);
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error = -zfs_rmdir(dir, dname(dentry), NULL, cr, 0);
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crfree(cr);
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ASSERT3S(error, <=, 0);
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return (error);
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}
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static int
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zpl_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
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{
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cred_t *cr = CRED();
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vattr_t *vap;
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struct inode *ip;
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int error;
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ip = dentry->d_inode;
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crhold(cr);
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vap = kmem_zalloc(sizeof(vattr_t), KM_SLEEP);
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error = -zfs_getattr(ip, vap, 0, cr);
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if (error)
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goto out;
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stat->ino = ip->i_ino;
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stat->dev = ip->i_sb->s_dev;
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stat->mode = vap->va_mode;
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stat->nlink = vap->va_nlink;
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stat->uid = vap->va_uid;
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stat->gid = vap->va_gid;
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stat->rdev = vap->va_rdev;
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stat->size = vap->va_size;
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stat->atime = vap->va_atime;
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stat->mtime = vap->va_mtime;
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stat->ctime = vap->va_ctime;
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stat->blksize = vap->va_blksize;
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stat->blocks = vap->va_nblocks;
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out:
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kmem_free(vap, sizeof(vattr_t));
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crfree(cr);
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ASSERT3S(error, <=, 0);
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return (error);
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}
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static int
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zpl_setattr(struct dentry *dentry, struct iattr *ia)
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{
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cred_t *cr = CRED();
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vattr_t *vap;
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int error;
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error = inode_change_ok(dentry->d_inode, ia);
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if (error)
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return (error);
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crhold(cr);
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vap = kmem_zalloc(sizeof(vattr_t), KM_SLEEP);
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vap->va_mask = ia->ia_valid & ATTR_IATTR_MASK;
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vap->va_mode = ia->ia_mode;
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vap->va_uid = ia->ia_uid;
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vap->va_gid = ia->ia_gid;
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vap->va_size = ia->ia_size;
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vap->va_atime = ia->ia_atime;
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vap->va_mtime = ia->ia_mtime;
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vap->va_ctime = ia->ia_ctime;
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error = -zfs_setattr(dentry->d_inode, vap, 0, cr);
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kmem_free(vap, sizeof(vattr_t));
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crfree(cr);
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ASSERT3S(error, <=, 0);
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return (error);
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}
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static int
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zpl_rename(struct inode *sdip, struct dentry *sdentry,
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struct inode *tdip, struct dentry *tdentry)
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{
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cred_t *cr = CRED();
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int error;
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crhold(cr);
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error = -zfs_rename(sdip, dname(sdentry), tdip, dname(tdentry), cr, 0);
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crfree(cr);
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ASSERT3S(error, <=, 0);
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return (error);
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}
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static int
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zpl_symlink(struct inode *dir, struct dentry *dentry, const char *name)
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{
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cred_t *cr = CRED();
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vattr_t *vap;
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struct inode *ip;
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int error;
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crhold(cr);
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vap = kmem_zalloc(sizeof(vattr_t), KM_SLEEP);
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vap->va_mode = S_IFLNK | S_IRWXUGO;
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vap->va_mask = ATTR_MODE;
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vap->va_uid = crgetfsuid(cr);
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vap->va_gid = crgetfsgid(cr);
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vap->va_dentry = dentry;
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error = -zfs_symlink(dir, dname(dentry), vap, (char *)name, &ip, cr, 0);
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kmem_free(vap, sizeof(vattr_t));
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crfree(cr);
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ASSERT3S(error, <=, 0);
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return (error);
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}
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static void *
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zpl_follow_link(struct dentry *dentry, struct nameidata *nd)
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{
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cred_t *cr = CRED();
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struct inode *ip = dentry->d_inode;
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struct iovec iov;
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uio_t uio;
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char *link;
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int error;
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crhold(cr);
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iov.iov_len = MAXPATHLEN;
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iov.iov_base = link = kmem_zalloc(MAXPATHLEN, KM_SLEEP);
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uio.uio_iov = &iov;
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uio.uio_iovcnt = 1;
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uio.uio_resid = (MAXPATHLEN - 1);
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uio.uio_segflg = UIO_SYSSPACE;
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error = -zfs_readlink(ip, &uio, cr);
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if (error) {
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kmem_free(link, MAXPATHLEN);
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nd_set_link(nd, ERR_PTR(error));
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} else {
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nd_set_link(nd, link);
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}
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crfree(cr);
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return (NULL);
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}
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static void
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zpl_put_link(struct dentry *dentry, struct nameidata *nd, void *ptr)
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{
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char *link;
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link = nd_get_link(nd);
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if (!IS_ERR(link))
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kmem_free(link, MAXPATHLEN);
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}
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static int
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zpl_link(struct dentry *old_dentry, struct inode *dir, struct dentry *dentry)
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{
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cred_t *cr = CRED();
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struct inode *ip = old_dentry->d_inode;
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int error;
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if (ip->i_nlink >= ZFS_LINK_MAX)
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return -EMLINK;
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crhold(cr);
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ip->i_ctime = CURRENT_TIME_SEC;
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igrab(ip); /* Use ihold() if available */
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error = -zfs_link(dir, ip, dname(dentry), cr);
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if (error) {
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iput(ip);
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goto out;
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}
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d_instantiate(dentry, ip);
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out:
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crfree(cr);
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ASSERT3S(error, <=, 0);
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return (error);
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}
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const struct inode_operations zpl_inode_operations = {
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.create = zpl_create,
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.link = zpl_link,
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.unlink = zpl_unlink,
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.symlink = zpl_symlink,
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.mkdir = zpl_mkdir,
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.rmdir = zpl_rmdir,
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.mknod = zpl_mknod,
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.rename = zpl_rename,
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.setattr = zpl_setattr,
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.getattr = zpl_getattr,
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.setxattr = generic_setxattr,
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.getxattr = generic_getxattr,
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.removexattr = generic_removexattr,
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.listxattr = zpl_xattr_list,
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};
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const struct inode_operations zpl_dir_inode_operations = {
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.create = zpl_create,
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.lookup = zpl_lookup,
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.link = zpl_link,
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.unlink = zpl_unlink,
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.symlink = zpl_symlink,
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.mkdir = zpl_mkdir,
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.rmdir = zpl_rmdir,
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.mknod = zpl_mknod,
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.rename = zpl_rename,
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.setattr = zpl_setattr,
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.getattr = zpl_getattr,
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.setxattr = generic_setxattr,
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.getxattr = generic_getxattr,
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.removexattr = generic_removexattr,
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.listxattr = zpl_xattr_list,
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};
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const struct inode_operations zpl_symlink_inode_operations = {
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.readlink = generic_readlink,
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.follow_link = zpl_follow_link,
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.put_link = zpl_put_link,
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};
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const struct inode_operations zpl_special_inode_operations = {
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.setattr = zpl_setattr,
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.getattr = zpl_getattr,
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.setxattr = generic_setxattr,
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.getxattr = generic_getxattr,
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.removexattr = generic_removexattr,
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.listxattr = zpl_xattr_list,
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};
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