426 lines
10 KiB
C
426 lines
10 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/zfs_ctldir.h>
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#include <sys/zpl.h>
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static struct inode *
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zpl_inode_alloc(struct super_block *sb)
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{
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struct inode *ip;
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VERIFY3S(zfs_inode_alloc(sb, &ip), ==, 0);
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inode_set_iversion(ip, 1);
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return (ip);
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}
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static void
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zpl_inode_destroy(struct inode *ip)
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{
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ASSERT(atomic_read(&ip->i_count) == 0);
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zfs_inode_destroy(ip);
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}
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/*
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* Called from __mark_inode_dirty() to reflect that something in the
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* inode has changed. We use it to ensure the znode system attributes
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* are always strictly update to date with respect to the inode.
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*/
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#ifdef HAVE_DIRTY_INODE_WITH_FLAGS
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static void
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zpl_dirty_inode(struct inode *ip, int flags)
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{
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fstrans_cookie_t cookie;
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cookie = spl_fstrans_mark();
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zfs_dirty_inode(ip, flags);
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spl_fstrans_unmark(cookie);
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}
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#else
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static void
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zpl_dirty_inode(struct inode *ip)
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{
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fstrans_cookie_t cookie;
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cookie = spl_fstrans_mark();
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zfs_dirty_inode(ip, 0);
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spl_fstrans_unmark(cookie);
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}
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#endif /* HAVE_DIRTY_INODE_WITH_FLAGS */
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/*
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* When ->drop_inode() is called its return value indicates if the
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* inode should be evicted from the inode cache. If the inode is
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* unhashed and has no links the default policy is to evict it
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* immediately.
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*
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* Prior to 2.6.36 this eviction was accomplished by the vfs calling
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* ->delete_inode(). It was ->delete_inode()'s responsibility to
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* truncate the inode pages and call clear_inode(). The call to
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* clear_inode() synchronously invalidates all the buffers and
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* calls ->clear_inode(). It was ->clear_inode()'s responsibility
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* to cleanup and filesystem specific data before freeing the inode.
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*
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* This elaborate mechanism was replaced by ->evict_inode() which
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* does the job of both ->delete_inode() and ->clear_inode(). It
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* will be called exactly once, and when it returns the inode must
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* be in a state where it can simply be freed.i
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*
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* The ->evict_inode() callback must minimally truncate the inode pages,
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* and call clear_inode(). For 2.6.35 and later kernels this will
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* simply update the inode state, with the sync occurring before the
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* truncate in evict(). For earlier kernels clear_inode() maps to
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* end_writeback() which is responsible for completing all outstanding
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* write back. In either case, once this is done it is safe to cleanup
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* any remaining inode specific data via zfs_inactive().
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* remaining filesystem specific data.
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*/
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#ifdef HAVE_EVICT_INODE
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static void
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zpl_evict_inode(struct inode *ip)
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{
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fstrans_cookie_t cookie;
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cookie = spl_fstrans_mark();
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truncate_setsize(ip, 0);
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clear_inode(ip);
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zfs_inactive(ip);
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spl_fstrans_unmark(cookie);
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}
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#else
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static void
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zpl_drop_inode(struct inode *ip)
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{
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generic_delete_inode(ip);
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}
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static void
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zpl_clear_inode(struct inode *ip)
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{
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fstrans_cookie_t cookie;
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cookie = spl_fstrans_mark();
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zfs_inactive(ip);
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spl_fstrans_unmark(cookie);
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}
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static void
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zpl_inode_delete(struct inode *ip)
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{
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truncate_setsize(ip, 0);
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clear_inode(ip);
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}
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#endif /* HAVE_EVICT_INODE */
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static void
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zpl_put_super(struct super_block *sb)
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{
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fstrans_cookie_t cookie;
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int error;
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cookie = spl_fstrans_mark();
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error = -zfs_umount(sb);
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spl_fstrans_unmark(cookie);
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ASSERT3S(error, <=, 0);
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}
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static int
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zpl_sync_fs(struct super_block *sb, int wait)
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{
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fstrans_cookie_t cookie;
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cred_t *cr = CRED();
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int error;
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crhold(cr);
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cookie = spl_fstrans_mark();
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error = -zfs_sync(sb, wait, cr);
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spl_fstrans_unmark(cookie);
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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_statfs(struct dentry *dentry, struct kstatfs *statp)
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{
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fstrans_cookie_t cookie;
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int error;
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cookie = spl_fstrans_mark();
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error = -zfs_statvfs(dentry, statp);
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spl_fstrans_unmark(cookie);
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ASSERT3S(error, <=, 0);
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/*
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* If required by a 32-bit system call, dynamically scale the
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* block size up to 16MiB and decrease the block counts. This
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* allows for a maximum size of 64EiB to be reported. The file
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* counts must be artificially capped at 2^32-1.
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*/
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if (unlikely(zpl_is_32bit_api())) {
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while (statp->f_blocks > UINT32_MAX &&
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statp->f_bsize < SPA_MAXBLOCKSIZE) {
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statp->f_frsize <<= 1;
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statp->f_bsize <<= 1;
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statp->f_blocks >>= 1;
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statp->f_bfree >>= 1;
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statp->f_bavail >>= 1;
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}
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uint64_t usedobjs = statp->f_files - statp->f_ffree;
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statp->f_ffree = MIN(statp->f_ffree, UINT32_MAX - usedobjs);
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statp->f_files = statp->f_ffree + usedobjs;
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}
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return (error);
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}
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static int
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zpl_remount_fs(struct super_block *sb, int *flags, char *data)
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{
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zfs_mnt_t zm = { .mnt_osname = NULL, .mnt_data = data };
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fstrans_cookie_t cookie;
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int error;
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cookie = spl_fstrans_mark();
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error = -zfs_remount(sb, flags, &zm);
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spl_fstrans_unmark(cookie);
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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_show_options(struct seq_file *seq, zfsvfs_t *zfsvfs)
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{
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seq_printf(seq, ",%s",
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zfsvfs->z_flags & ZSB_XATTR ? "xattr" : "noxattr");
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#ifdef CONFIG_FS_POSIX_ACL
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switch (zfsvfs->z_acl_type) {
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case ZFS_ACLTYPE_POSIXACL:
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seq_puts(seq, ",posixacl");
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break;
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default:
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seq_puts(seq, ",noacl");
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break;
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}
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#endif /* CONFIG_FS_POSIX_ACL */
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return (0);
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}
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#ifdef HAVE_SHOW_OPTIONS_WITH_DENTRY
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static int
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zpl_show_options(struct seq_file *seq, struct dentry *root)
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{
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return (__zpl_show_options(seq, root->d_sb->s_fs_info));
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}
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#else
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static int
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zpl_show_options(struct seq_file *seq, struct vfsmount *vfsp)
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{
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return (__zpl_show_options(seq, vfsp->mnt_sb->s_fs_info));
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}
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#endif /* HAVE_SHOW_OPTIONS_WITH_DENTRY */
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static int
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zpl_fill_super(struct super_block *sb, void *data, int silent)
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{
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zfs_mnt_t *zm = (zfs_mnt_t *)data;
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fstrans_cookie_t cookie;
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int error;
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cookie = spl_fstrans_mark();
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error = -zfs_domount(sb, zm, silent);
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spl_fstrans_unmark(cookie);
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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_test_super(struct super_block *s, void *data)
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{
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zfsvfs_t *zfsvfs = s->s_fs_info;
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objset_t *os = data;
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if (zfsvfs == NULL)
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return (0);
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return (os == zfsvfs->z_os);
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}
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static struct super_block *
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zpl_mount_impl(struct file_system_type *fs_type, int flags, zfs_mnt_t *zm)
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{
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struct super_block *s;
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objset_t *os;
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int err;
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err = dmu_objset_hold(zm->mnt_osname, FTAG, &os);
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if (err)
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return (ERR_PTR(-err));
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/*
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* The dsl pool lock must be released prior to calling sget().
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* It is possible sget() may block on the lock in grab_super()
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* while deactivate_super() holds that same lock and waits for
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* a txg sync. If the dsl_pool lock is held over sget()
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* this can prevent the pool sync and cause a deadlock.
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*/
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dsl_pool_rele(dmu_objset_pool(os), FTAG);
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s = zpl_sget(fs_type, zpl_test_super, set_anon_super, flags, os);
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dsl_dataset_rele(dmu_objset_ds(os), FTAG);
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if (IS_ERR(s))
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return (ERR_CAST(s));
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if (s->s_root == NULL) {
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err = zpl_fill_super(s, zm, flags & SB_SILENT ? 1 : 0);
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if (err) {
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deactivate_locked_super(s);
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return (ERR_PTR(err));
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}
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s->s_flags |= SB_ACTIVE;
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} else if ((flags ^ s->s_flags) & SB_RDONLY) {
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deactivate_locked_super(s);
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return (ERR_PTR(-EBUSY));
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}
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return (s);
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}
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#ifdef HAVE_FST_MOUNT
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static struct dentry *
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zpl_mount(struct file_system_type *fs_type, int flags,
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const char *osname, void *data)
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{
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zfs_mnt_t zm = { .mnt_osname = osname, .mnt_data = data };
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struct super_block *sb = zpl_mount_impl(fs_type, flags, &zm);
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if (IS_ERR(sb))
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return (ERR_CAST(sb));
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return (dget(sb->s_root));
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}
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#else
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static int
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zpl_get_sb(struct file_system_type *fs_type, int flags,
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const char *osname, void *data, struct vfsmount *mnt)
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{
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zfs_mnt_t zm = { .mnt_osname = osname, .mnt_data = data };
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struct super_block *sb = zpl_mount_impl(fs_type, flags, &zm);
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if (IS_ERR(sb))
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return (PTR_ERR(sb));
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(void) simple_set_mnt(mnt, sb);
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return (0);
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}
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#endif /* HAVE_FST_MOUNT */
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static void
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zpl_kill_sb(struct super_block *sb)
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{
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zfs_preumount(sb);
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kill_anon_super(sb);
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#ifdef HAVE_S_INSTANCES_LIST_HEAD
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sb->s_instances.next = &(zpl_fs_type.fs_supers);
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#endif /* HAVE_S_INSTANCES_LIST_HEAD */
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}
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void
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zpl_prune_sb(int64_t nr_to_scan, void *arg)
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{
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struct super_block *sb = (struct super_block *)arg;
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int objects = 0;
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(void) -zfs_prune(sb, nr_to_scan, &objects);
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}
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#ifdef HAVE_NR_CACHED_OBJECTS
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static int
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zpl_nr_cached_objects(struct super_block *sb)
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{
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return (0);
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}
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#endif /* HAVE_NR_CACHED_OBJECTS */
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#ifdef HAVE_FREE_CACHED_OBJECTS
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static void
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zpl_free_cached_objects(struct super_block *sb, int nr_to_scan)
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{
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/* noop */
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}
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#endif /* HAVE_FREE_CACHED_OBJECTS */
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const struct super_operations zpl_super_operations = {
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.alloc_inode = zpl_inode_alloc,
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.destroy_inode = zpl_inode_destroy,
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.dirty_inode = zpl_dirty_inode,
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.write_inode = NULL,
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#ifdef HAVE_EVICT_INODE
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.evict_inode = zpl_evict_inode,
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#else
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.drop_inode = zpl_drop_inode,
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.clear_inode = zpl_clear_inode,
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.delete_inode = zpl_inode_delete,
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#endif /* HAVE_EVICT_INODE */
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.put_super = zpl_put_super,
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.sync_fs = zpl_sync_fs,
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.statfs = zpl_statfs,
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.remount_fs = zpl_remount_fs,
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.show_options = zpl_show_options,
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.show_stats = NULL,
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#ifdef HAVE_NR_CACHED_OBJECTS
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.nr_cached_objects = zpl_nr_cached_objects,
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#endif /* HAVE_NR_CACHED_OBJECTS */
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#ifdef HAVE_FREE_CACHED_OBJECTS
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.free_cached_objects = zpl_free_cached_objects,
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#endif /* HAVE_FREE_CACHED_OBJECTS */
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};
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struct file_system_type zpl_fs_type = {
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.owner = THIS_MODULE,
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.name = ZFS_DRIVER,
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#ifdef HAVE_FST_MOUNT
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.mount = zpl_mount,
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#else
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.get_sb = zpl_get_sb,
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#endif /* HAVE_FST_MOUNT */
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.kill_sb = zpl_kill_sb,
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};
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