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331 lines
7.3 KiB
331 lines
7.3 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* Super block/filesystem wide operations |
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* |
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* Copyright (C) 1996 Peter J. Braam <[email protected]> and |
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* Michael Callahan <[email protected]> |
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* |
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* Rewritten for Linux 2.1. Peter Braam <[email protected]> |
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* Copyright (C) Carnegie Mellon University |
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*/ |
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#include <linux/module.h> |
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#include <linux/kernel.h> |
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#include <linux/mm.h> |
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#include <linux/string.h> |
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#include <linux/stat.h> |
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#include <linux/errno.h> |
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#include <linux/unistd.h> |
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#include <linux/mutex.h> |
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#include <linux/spinlock.h> |
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#include <linux/file.h> |
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#include <linux/vfs.h> |
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#include <linux/slab.h> |
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#include <linux/pid_namespace.h> |
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#include <linux/uaccess.h> |
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#include <linux/fs.h> |
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#include <linux/vmalloc.h> |
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#include <linux/coda.h> |
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#include "coda_psdev.h" |
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#include "coda_linux.h" |
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#include "coda_cache.h" |
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#include "coda_int.h" |
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/* VFS super_block ops */ |
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static void coda_evict_inode(struct inode *); |
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static void coda_put_super(struct super_block *); |
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static int coda_statfs(struct dentry *dentry, struct kstatfs *buf); |
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static struct kmem_cache * coda_inode_cachep; |
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static struct inode *coda_alloc_inode(struct super_block *sb) |
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{ |
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struct coda_inode_info *ei; |
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ei = kmem_cache_alloc(coda_inode_cachep, GFP_KERNEL); |
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if (!ei) |
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return NULL; |
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memset(&ei->c_fid, 0, sizeof(struct CodaFid)); |
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ei->c_flags = 0; |
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ei->c_uid = GLOBAL_ROOT_UID; |
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ei->c_cached_perm = 0; |
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spin_lock_init(&ei->c_lock); |
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return &ei->vfs_inode; |
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} |
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static void coda_free_inode(struct inode *inode) |
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{ |
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kmem_cache_free(coda_inode_cachep, ITOC(inode)); |
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} |
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static void init_once(void *foo) |
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{ |
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struct coda_inode_info *ei = (struct coda_inode_info *) foo; |
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inode_init_once(&ei->vfs_inode); |
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} |
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int __init coda_init_inodecache(void) |
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{ |
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coda_inode_cachep = kmem_cache_create("coda_inode_cache", |
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sizeof(struct coda_inode_info), 0, |
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SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD| |
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SLAB_ACCOUNT, init_once); |
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if (coda_inode_cachep == NULL) |
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return -ENOMEM; |
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return 0; |
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} |
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void coda_destroy_inodecache(void) |
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{ |
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/* |
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* Make sure all delayed rcu free inodes are flushed before we |
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* destroy cache. |
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*/ |
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rcu_barrier(); |
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kmem_cache_destroy(coda_inode_cachep); |
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} |
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static int coda_remount(struct super_block *sb, int *flags, char *data) |
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{ |
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sync_filesystem(sb); |
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*flags |= SB_NOATIME; |
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return 0; |
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} |
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/* exported operations */ |
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static const struct super_operations coda_super_operations = |
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{ |
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.alloc_inode = coda_alloc_inode, |
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.free_inode = coda_free_inode, |
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.evict_inode = coda_evict_inode, |
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.put_super = coda_put_super, |
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.statfs = coda_statfs, |
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.remount_fs = coda_remount, |
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}; |
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static int get_device_index(struct coda_mount_data *data) |
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{ |
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struct fd f; |
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struct inode *inode; |
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int idx; |
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if (data == NULL) { |
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pr_warn("%s: Bad mount data\n", __func__); |
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return -1; |
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} |
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if (data->version != CODA_MOUNT_VERSION) { |
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pr_warn("%s: Bad mount version\n", __func__); |
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return -1; |
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} |
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f = fdget(data->fd); |
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if (!f.file) |
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goto Ebadf; |
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inode = file_inode(f.file); |
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if (!S_ISCHR(inode->i_mode) || imajor(inode) != CODA_PSDEV_MAJOR) { |
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fdput(f); |
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goto Ebadf; |
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} |
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idx = iminor(inode); |
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fdput(f); |
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if (idx < 0 || idx >= MAX_CODADEVS) { |
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pr_warn("%s: Bad minor number\n", __func__); |
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return -1; |
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} |
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return idx; |
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Ebadf: |
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pr_warn("%s: Bad file\n", __func__); |
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return -1; |
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} |
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static int coda_fill_super(struct super_block *sb, void *data, int silent) |
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{ |
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struct inode *root = NULL; |
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struct venus_comm *vc; |
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struct CodaFid fid; |
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int error; |
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int idx; |
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if (task_active_pid_ns(current) != &init_pid_ns) |
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return -EINVAL; |
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idx = get_device_index((struct coda_mount_data *) data); |
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/* Ignore errors in data, for backward compatibility */ |
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if(idx == -1) |
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idx = 0; |
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pr_info("%s: device index: %i\n", __func__, idx); |
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vc = &coda_comms[idx]; |
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mutex_lock(&vc->vc_mutex); |
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if (!vc->vc_inuse) { |
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pr_warn("%s: No pseudo device\n", __func__); |
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error = -EINVAL; |
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goto unlock_out; |
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} |
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if (vc->vc_sb) { |
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pr_warn("%s: Device already mounted\n", __func__); |
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error = -EBUSY; |
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goto unlock_out; |
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} |
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vc->vc_sb = sb; |
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mutex_unlock(&vc->vc_mutex); |
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sb->s_fs_info = vc; |
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sb->s_flags |= SB_NOATIME; |
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sb->s_blocksize = 4096; /* XXXXX what do we put here?? */ |
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sb->s_blocksize_bits = 12; |
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sb->s_magic = CODA_SUPER_MAGIC; |
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sb->s_op = &coda_super_operations; |
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sb->s_d_op = &coda_dentry_operations; |
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sb->s_time_gran = 1; |
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sb->s_time_min = S64_MIN; |
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sb->s_time_max = S64_MAX; |
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error = super_setup_bdi(sb); |
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if (error) |
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goto error; |
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/* get root fid from Venus: this needs the root inode */ |
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error = venus_rootfid(sb, &fid); |
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if ( error ) { |
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pr_warn("%s: coda_get_rootfid failed with %d\n", |
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__func__, error); |
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goto error; |
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} |
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pr_info("%s: rootfid is %s\n", __func__, coda_f2s(&fid)); |
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/* make root inode */ |
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root = coda_cnode_make(&fid, sb); |
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if (IS_ERR(root)) { |
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error = PTR_ERR(root); |
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pr_warn("Failure of coda_cnode_make for root: error %d\n", |
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error); |
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goto error; |
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} |
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pr_info("%s: rootinode is %ld dev %s\n", |
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__func__, root->i_ino, root->i_sb->s_id); |
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sb->s_root = d_make_root(root); |
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if (!sb->s_root) { |
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error = -EINVAL; |
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goto error; |
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} |
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return 0; |
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error: |
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mutex_lock(&vc->vc_mutex); |
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vc->vc_sb = NULL; |
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sb->s_fs_info = NULL; |
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unlock_out: |
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mutex_unlock(&vc->vc_mutex); |
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return error; |
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} |
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static void coda_put_super(struct super_block *sb) |
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{ |
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struct venus_comm *vcp = coda_vcp(sb); |
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mutex_lock(&vcp->vc_mutex); |
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vcp->vc_sb = NULL; |
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sb->s_fs_info = NULL; |
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mutex_unlock(&vcp->vc_mutex); |
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mutex_destroy(&vcp->vc_mutex); |
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pr_info("Bye bye.\n"); |
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} |
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static void coda_evict_inode(struct inode *inode) |
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{ |
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truncate_inode_pages_final(&inode->i_data); |
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clear_inode(inode); |
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coda_cache_clear_inode(inode); |
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} |
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int coda_getattr(struct user_namespace *mnt_userns, const struct path *path, |
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struct kstat *stat, u32 request_mask, unsigned int flags) |
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{ |
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int err = coda_revalidate_inode(d_inode(path->dentry)); |
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if (!err) |
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generic_fillattr(&init_user_ns, d_inode(path->dentry), stat); |
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return err; |
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} |
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int coda_setattr(struct user_namespace *mnt_userns, struct dentry *de, |
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struct iattr *iattr) |
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{ |
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struct inode *inode = d_inode(de); |
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struct coda_vattr vattr; |
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int error; |
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memset(&vattr, 0, sizeof(vattr)); |
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inode->i_ctime = current_time(inode); |
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coda_iattr_to_vattr(iattr, &vattr); |
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vattr.va_type = C_VNON; /* cannot set type */ |
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/* Venus is responsible for truncating the container-file!!! */ |
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error = venus_setattr(inode->i_sb, coda_i2f(inode), &vattr); |
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if (!error) { |
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coda_vattr_to_iattr(inode, &vattr); |
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coda_cache_clear_inode(inode); |
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} |
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return error; |
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} |
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const struct inode_operations coda_file_inode_operations = { |
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.permission = coda_permission, |
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.getattr = coda_getattr, |
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.setattr = coda_setattr, |
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}; |
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static int coda_statfs(struct dentry *dentry, struct kstatfs *buf) |
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{ |
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int error; |
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error = venus_statfs(dentry, buf); |
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if (error) { |
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/* fake something like AFS does */ |
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buf->f_blocks = 9000000; |
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buf->f_bfree = 9000000; |
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buf->f_bavail = 9000000; |
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buf->f_files = 9000000; |
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buf->f_ffree = 9000000; |
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} |
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/* and fill in the rest */ |
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buf->f_type = CODA_SUPER_MAGIC; |
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buf->f_bsize = 4096; |
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buf->f_namelen = CODA_MAXNAMLEN; |
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return 0; |
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} |
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/* init_coda: used by filesystems.c to register coda */ |
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static struct dentry *coda_mount(struct file_system_type *fs_type, |
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int flags, const char *dev_name, void *data) |
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{ |
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return mount_nodev(fs_type, flags, data, coda_fill_super); |
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} |
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struct file_system_type coda_fs_type = { |
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.owner = THIS_MODULE, |
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.name = "coda", |
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.mount = coda_mount, |
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.kill_sb = kill_anon_super, |
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.fs_flags = FS_BINARY_MOUNTDATA, |
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}; |
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MODULE_ALIAS_FS("coda"); |
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