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e89260a1c8
Unlike normal file or directory znodes, an xattr znode is guaranteed to only have a single parent. Therefore, we can take a refernce on that parent if it is provided at create time and cache it. Additionally, we take care to cache it on any subsequent zfs_zaccess() where the parent is provided as an optimization. This allows us to avoid needing to do a zfs_zget() when setting up the SELinux security xattr in the create path. This is critical because a hash lookup on the directory will deadlock since it is locked. The zpl_xattr_security_init() call has also been moved up to the zpl layer to ensure TXs to create the required xattrs are performed after the create TX. Otherwise we run the risk of deadlocking on the open create TX. Ideally the security xattr should be fully constructed before the new inode is unlocked. However, doing so would require far more extensive changes to ZFS. This change may also have the benefitial side effect of ensuring xattr directory znodes are evicted from the cache before normal file or directory znodes due to the extra reference. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #671
443 lines
9.7 KiB
C
443 lines
9.7 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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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, struct dentry *dentry,
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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_dentry = dentry;
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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, dentry, 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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}
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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, dentry, mode, cr);
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vap->va_rdev = rdev;
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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, 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, dentry, mode | S_IFDIR, cr);
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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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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, dentry, 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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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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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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