ee93035378
As of Linux 2.6.37 the right way to register custom dentry operations is to use the super block's ->s_d_op field. For older kernels they should be registered as part of the lookup operation. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #1223
499 lines
11 KiB
C
499 lines
11 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/zfs_znode.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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#ifdef HAVE_LOOKUP_NAMEIDATA
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zpl_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
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#else
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zpl_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags)
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#endif
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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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spin_lock(&dentry->d_lock);
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dentry->d_time = jiffies;
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#ifndef HAVE_S_D_OP
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d_set_d_op(dentry, &zpl_dentry_operations);
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#endif /* HAVE_S_D_OP */
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spin_unlock(&dentry->d_lock);
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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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void
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zpl_vap_init(vattr_t *vap, struct inode *dir, zpl_umode_t mode, cred_t *cr)
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{
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vap->va_mask = ATTR_MODE;
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vap->va_mode = mode;
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vap->va_uid = crgetfsuid(cr);
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if (dir && dir->i_mode & S_ISGID) {
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vap->va_gid = dir->i_gid;
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if (S_ISDIR(mode))
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vap->va_mode |= S_ISGID;
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} else {
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vap->va_gid = crgetfsgid(cr);
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}
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}
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static int
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#ifdef HAVE_CREATE_NAMEIDATA
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zpl_create(struct inode *dir, struct dentry *dentry, zpl_umode_t mode,
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struct nameidata *nd)
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#else
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zpl_create(struct inode *dir, struct dentry *dentry, zpl_umode_t mode,
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bool flag)
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#endif
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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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zpl_vap_init(vap, dir, mode, cr);
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error = -zfs_create(dir, dname(dentry), vap, 0, mode, &ip, cr, 0, NULL);
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if (error == 0) {
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error = zpl_xattr_security_init(ip, dir, &dentry->d_name);
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VERIFY3S(error, ==, 0);
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d_instantiate(dentry, ip);
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}
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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, zpl_umode_t mode,
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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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/*
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* We currently expect Linux to supply rdev=0 for all sockets
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* and fifos, but we want to know if this behavior ever changes.
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*/
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if (S_ISSOCK(mode) || S_ISFIFO(mode))
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ASSERT(rdev == 0);
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crhold(cr);
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vap = kmem_zalloc(sizeof(vattr_t), KM_SLEEP);
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zpl_vap_init(vap, dir, mode, cr);
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vap->va_rdev = rdev;
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error = -zfs_create(dir, dname(dentry), vap, 0, mode, &ip, cr, 0, NULL);
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if (error == 0)
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d_instantiate(dentry, ip);
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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, zpl_umode_t 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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zpl_vap_init(vap, dir, mode | S_IFDIR, cr);
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error = -zfs_mkdir(dir, dname(dentry), vap, &ip, cr, 0, NULL);
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if (error == 0)
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d_instantiate(dentry, ip);
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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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boolean_t issnap = ITOZSB(dentry->d_inode)->z_issnap;
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int error;
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/*
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* Ensure MNT_SHRINKABLE is set on snapshots to ensure they are
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* unmounted automatically with the parent file system. This
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* is done on the first getattr because it's not easy to get the
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* vfsmount structure at mount time. This call path is explicitly
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* marked unlikely to avoid any performance impact. FWIW, ext4
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* resorts to a similar trick for sysadmin convenience.
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*/
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if (unlikely(issnap && !(mnt->mnt_flags & MNT_SHRINKABLE)))
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mnt->mnt_flags |= MNT_SHRINKABLE;
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error = -zfs_getattr_fast(dentry->d_inode, stat);
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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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zpl_vap_init(vap, dir, S_IFLNK | S_IRWXUGO, cr);
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error = -zfs_symlink(dir, dname(dentry), vap, (char *)name, &ip, cr, 0);
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if (error == 0)
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d_instantiate(dentry, ip);
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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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const char *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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#ifdef HAVE_INODE_TRUNCATE_RANGE
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static void
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zpl_truncate_range(struct inode* ip, loff_t start, loff_t end)
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{
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cred_t *cr = CRED();
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flock64_t bf;
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ASSERT3S(start, <=, end);
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/*
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* zfs_freesp() will interpret (len == 0) as meaning "truncate until
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* the end of the file". We don't want that.
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*/
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if (start == end)
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return;
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crhold(cr);
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bf.l_type = F_WRLCK;
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bf.l_whence = 0;
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bf.l_start = start;
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bf.l_len = end - start;
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bf.l_pid = 0;
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zfs_space(ip, F_FREESP, &bf, FWRITE, start, cr);
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crfree(cr);
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}
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#endif /* HAVE_INODE_TRUNCATE_RANGE */
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#ifdef HAVE_INODE_FALLOCATE
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static long
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zpl_fallocate(struct inode *ip, int mode, loff_t offset, loff_t len)
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{
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return zpl_fallocate_common(ip, mode, offset, len);
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}
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#endif /* HAVE_INODE_FALLOCATE */
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static int
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#ifdef HAVE_D_REVALIDATE_NAMEIDATA
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zpl_revalidate(struct dentry *dentry, struct nameidata *nd)
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{
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unsigned int flags = nd->flags;
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#else
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zpl_revalidate(struct dentry *dentry, unsigned int flags)
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{
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#endif /* HAVE_D_REVALIDATE_NAMEIDATA */
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zfs_sb_t *zsb = dentry->d_sb->s_fs_info;
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int error;
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if (flags & LOOKUP_RCU)
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return (-ECHILD);
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/*
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* After a rollback negative dentries created before the rollback
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* time must be invalidated. Otherwise they can obscure files which
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* are only present in the rolled back dataset.
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*/
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if (dentry->d_inode == NULL) {
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spin_lock(&dentry->d_lock);
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error = time_before(dentry->d_time, zsb->z_rollback_time);
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spin_unlock(&dentry->d_lock);
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if (error)
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return (0);
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}
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/*
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* The dentry may reference a stale inode if a mounted file system
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* was rolled back to a point in time where the object didn't exist.
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*/
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if (dentry->d_inode && ITOZ(dentry->d_inode)->z_is_stale)
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return (0);
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return (1);
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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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#ifdef HAVE_INODE_TRUNCATE_RANGE
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.truncate_range = zpl_truncate_range,
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#endif /* HAVE_INODE_TRUNCATE_RANGE */
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#ifdef HAVE_INODE_FALLOCATE
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.fallocate = zpl_fallocate,
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#endif /* HAVE_INODE_FALLOCATE */
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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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.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_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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dentry_operations_t zpl_dentry_operations = {
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.d_revalidate = zpl_revalidate,
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};
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