53cf50e081
Filesystems like ZFS must use what the kernel calls an anonymous super block. Basically, this is just a filesystem which is not backed by a single block device. Normally this block device's dev_t is stored in the super block. For anonymous super blocks a unique reserved dev_t is assigned as part of get_sb(). This sb->s_dev must then be set in the returned stat structures as stat->st_dev. This allows userspace utilities to easily detect the boundries of a specific filesystem. Tools such as 'du' depend on this for proper accounting. Additionally, under OpenSolaris the statfs->f_fsid is set to the device id. To preserve consistency with OpenSolaris we also set the fsid to the device id. Other Linux filesystem (ext) set the fsid to a unique value determined by the filesystems uuid. This value is unique but maintains no relationship to the device id. This may be desirable when exporting NFS filesystem because it minimizes to chance of a client observing the same fsid from two different servers. Closes #140
400 lines
8.5 KiB
C
400 lines
8.5 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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struct inode *ip;
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cred_t *cr;
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int error;
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cr = (cred_t *)get_current_cred();
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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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put_cred(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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const struct cred *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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cred = get_current_cred();
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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 = current_fsuid();
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vap->va_gid = current_fsgid();
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error = -zfs_create(dir, (char *)dentry->d_name.name,
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vap, 0, mode, &ip, (struct cred *)cred, 0, NULL);
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if (error)
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goto out;
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d_instantiate(dentry, ip);
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out:
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kmem_free(vap, sizeof(vattr_t));
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put_cred(cred);
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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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const struct cred *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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cred = get_current_cred();
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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 = current_fsuid();
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vap->va_gid = current_fsgid();
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error = -zfs_create(dir, (char *)dentry->d_name.name,
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vap, 0, mode, &ip, (struct cred *)cred, 0, NULL);
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if (error)
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goto out;
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d_instantiate(dentry, ip);
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out:
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kmem_free(vap, sizeof(vattr_t));
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put_cred(cred);
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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;
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int error;
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cr = (cred_t *)get_current_cred();
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error = -zfs_remove(dir, dname(dentry), cr);
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put_cred(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;
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vattr_t *vap;
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struct inode *ip;
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int error;
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cr = (cred_t *)get_current_cred();
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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 = current_fsuid();
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vap->va_gid = current_fsgid();
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error = -zfs_mkdir(dir, dname(dentry), vap, &ip, cr, 0, NULL);
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if (error)
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goto out;
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d_instantiate(dentry, ip);
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out:
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kmem_free(vap, sizeof(vattr_t));
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put_cred(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;
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int error;
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cr = (cred_t *)get_current_cred();
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error = -zfs_rmdir(dir, dname(dentry), NULL, cr, 0);
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put_cred(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;
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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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cr = (cred_t *)get_current_cred();
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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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put_cred(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;
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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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cr = (cred_t *)get_current_cred();
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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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put_cred(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;
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int error;
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cr = (cred_t *)get_current_cred();
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error = -zfs_rename(sdip, dname(sdentry), tdip, dname(tdentry), cr, 0);
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put_cred(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;
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vattr_t *vap;
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struct inode *ip;
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int error;
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cr = (cred_t *)get_current_cred();
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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 = current_fsuid();
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vap->va_gid = current_fsgid();
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error = -zfs_symlink(dir, dname(dentry), vap, (char *)name, &ip, cr, 0);
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if (error)
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goto out;
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d_instantiate(dentry, ip);
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out:
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kmem_free(vap, sizeof(vattr_t));
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put_cred(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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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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cred_t *cr;
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int error;
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cr = (cred_t *)get_current_cred();
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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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put_cred(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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struct inode *ip = old_dentry->d_inode;
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cred_t *cr;
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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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cr = (cred_t *)get_current_cred();
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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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put_cred(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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