| /* |
| * Super block/filesystem wide operations |
| * |
| * Copyright (C) 1996 Peter J. Braam <braam@maths.ox.ac.uk> and |
| * Michael Callahan <callahan@maths.ox.ac.uk> |
| * |
| * Rewritten for Linux 2.1. Peter Braam <braam@cs.cmu.edu> |
| * Copyright (C) Carnegie Mellon University |
| */ |
| |
| #include <linux/module.h> |
| #include <linux/kernel.h> |
| #include <linux/mm.h> |
| #include <linux/string.h> |
| #include <linux/stat.h> |
| #include <linux/errno.h> |
| #include <linux/unistd.h> |
| #include <linux/smp_lock.h> |
| #include <linux/spinlock.h> |
| #include <linux/file.h> |
| #include <linux/vfs.h> |
| #include <linux/slab.h> |
| |
| #include <asm/system.h> |
| #include <asm/uaccess.h> |
| |
| #include <linux/fs.h> |
| #include <linux/vmalloc.h> |
| |
| #include <linux/coda.h> |
| #include <linux/coda_linux.h> |
| #include <linux/coda_psdev.h> |
| #include <linux/coda_fs_i.h> |
| #include <linux/coda_cache.h> |
| |
| #include "coda_int.h" |
| |
| /* VFS super_block ops */ |
| static void coda_evict_inode(struct inode *); |
| static void coda_put_super(struct super_block *); |
| static int coda_statfs(struct dentry *dentry, struct kstatfs *buf); |
| |
| static struct kmem_cache * coda_inode_cachep; |
| |
| static struct inode *coda_alloc_inode(struct super_block *sb) |
| { |
| struct coda_inode_info *ei; |
| ei = (struct coda_inode_info *)kmem_cache_alloc(coda_inode_cachep, GFP_KERNEL); |
| if (!ei) |
| return NULL; |
| memset(&ei->c_fid, 0, sizeof(struct CodaFid)); |
| ei->c_flags = 0; |
| ei->c_uid = 0; |
| ei->c_cached_perm = 0; |
| spin_lock_init(&ei->c_lock); |
| return &ei->vfs_inode; |
| } |
| |
| static void coda_destroy_inode(struct inode *inode) |
| { |
| kmem_cache_free(coda_inode_cachep, ITOC(inode)); |
| } |
| |
| static void init_once(void *foo) |
| { |
| struct coda_inode_info *ei = (struct coda_inode_info *) foo; |
| |
| inode_init_once(&ei->vfs_inode); |
| } |
| |
| int coda_init_inodecache(void) |
| { |
| coda_inode_cachep = kmem_cache_create("coda_inode_cache", |
| sizeof(struct coda_inode_info), |
| 0, SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD, |
| init_once); |
| if (coda_inode_cachep == NULL) |
| return -ENOMEM; |
| return 0; |
| } |
| |
| void coda_destroy_inodecache(void) |
| { |
| kmem_cache_destroy(coda_inode_cachep); |
| } |
| |
| static int coda_remount(struct super_block *sb, int *flags, char *data) |
| { |
| *flags |= MS_NOATIME; |
| return 0; |
| } |
| |
| /* exported operations */ |
| static const struct super_operations coda_super_operations = |
| { |
| .alloc_inode = coda_alloc_inode, |
| .destroy_inode = coda_destroy_inode, |
| .evict_inode = coda_evict_inode, |
| .put_super = coda_put_super, |
| .statfs = coda_statfs, |
| .remount_fs = coda_remount, |
| }; |
| |
| static int get_device_index(struct coda_mount_data *data) |
| { |
| struct file *file; |
| struct inode *inode; |
| int idx; |
| |
| if(data == NULL) { |
| printk("coda_read_super: Bad mount data\n"); |
| return -1; |
| } |
| |
| if(data->version != CODA_MOUNT_VERSION) { |
| printk("coda_read_super: Bad mount version\n"); |
| return -1; |
| } |
| |
| file = fget(data->fd); |
| inode = NULL; |
| if(file) |
| inode = file->f_path.dentry->d_inode; |
| |
| if(!inode || !S_ISCHR(inode->i_mode) || |
| imajor(inode) != CODA_PSDEV_MAJOR) { |
| if(file) |
| fput(file); |
| |
| printk("coda_read_super: Bad file\n"); |
| return -1; |
| } |
| |
| idx = iminor(inode); |
| fput(file); |
| |
| if(idx < 0 || idx >= MAX_CODADEVS) { |
| printk("coda_read_super: Bad minor number\n"); |
| return -1; |
| } |
| |
| return idx; |
| } |
| |
| static int coda_fill_super(struct super_block *sb, void *data, int silent) |
| { |
| struct inode *root = NULL; |
| struct venus_comm *vc = NULL; |
| struct CodaFid fid; |
| int error; |
| int idx; |
| |
| lock_kernel(); |
| |
| idx = get_device_index((struct coda_mount_data *) data); |
| |
| /* Ignore errors in data, for backward compatibility */ |
| if(idx == -1) |
| idx = 0; |
| |
| printk(KERN_INFO "coda_read_super: device index: %i\n", idx); |
| |
| vc = &coda_comms[idx]; |
| if (!vc->vc_inuse) { |
| printk("coda_read_super: No pseudo device\n"); |
| unlock_kernel(); |
| return -EINVAL; |
| } |
| |
| if ( vc->vc_sb ) { |
| printk("coda_read_super: Device already mounted\n"); |
| unlock_kernel(); |
| return -EBUSY; |
| } |
| |
| error = bdi_setup_and_register(&vc->bdi, "coda", BDI_CAP_MAP_COPY); |
| if (error) |
| goto bdi_err; |
| |
| vc->vc_sb = sb; |
| |
| sb->s_fs_info = vc; |
| sb->s_flags |= MS_NOATIME; |
| sb->s_blocksize = 4096; /* XXXXX what do we put here?? */ |
| sb->s_blocksize_bits = 12; |
| sb->s_magic = CODA_SUPER_MAGIC; |
| sb->s_op = &coda_super_operations; |
| sb->s_bdi = &vc->bdi; |
| |
| /* get root fid from Venus: this needs the root inode */ |
| error = venus_rootfid(sb, &fid); |
| if ( error ) { |
| printk("coda_read_super: coda_get_rootfid failed with %d\n", |
| error); |
| goto error; |
| } |
| printk("coda_read_super: rootfid is %s\n", coda_f2s(&fid)); |
| |
| /* make root inode */ |
| error = coda_cnode_make(&root, &fid, sb); |
| if ( error || !root ) { |
| printk("Failure of coda_cnode_make for root: error %d\n", error); |
| goto error; |
| } |
| |
| printk("coda_read_super: rootinode is %ld dev %s\n", |
| root->i_ino, root->i_sb->s_id); |
| sb->s_root = d_alloc_root(root); |
| if (!sb->s_root) |
| goto error; |
| unlock_kernel(); |
| return 0; |
| |
| error: |
| bdi_destroy(&vc->bdi); |
| bdi_err: |
| if (root) |
| iput(root); |
| if (vc) |
| vc->vc_sb = NULL; |
| |
| unlock_kernel(); |
| return -EINVAL; |
| } |
| |
| static void coda_put_super(struct super_block *sb) |
| { |
| bdi_destroy(&coda_vcp(sb)->bdi); |
| coda_vcp(sb)->vc_sb = NULL; |
| sb->s_fs_info = NULL; |
| |
| printk("Coda: Bye bye.\n"); |
| } |
| |
| static void coda_evict_inode(struct inode *inode) |
| { |
| truncate_inode_pages(&inode->i_data, 0); |
| end_writeback(inode); |
| coda_cache_clear_inode(inode); |
| } |
| |
| int coda_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat) |
| { |
| int err = coda_revalidate_inode(dentry); |
| if (!err) |
| generic_fillattr(dentry->d_inode, stat); |
| return err; |
| } |
| |
| int coda_setattr(struct dentry *de, struct iattr *iattr) |
| { |
| struct inode *inode = de->d_inode; |
| struct coda_vattr vattr; |
| int error; |
| |
| lock_kernel(); |
| |
| memset(&vattr, 0, sizeof(vattr)); |
| |
| inode->i_ctime = CURRENT_TIME_SEC; |
| coda_iattr_to_vattr(iattr, &vattr); |
| vattr.va_type = C_VNON; /* cannot set type */ |
| |
| /* Venus is responsible for truncating the container-file!!! */ |
| error = venus_setattr(inode->i_sb, coda_i2f(inode), &vattr); |
| |
| if ( !error ) { |
| coda_vattr_to_iattr(inode, &vattr); |
| coda_cache_clear_inode(inode); |
| } |
| |
| unlock_kernel(); |
| |
| return error; |
| } |
| |
| const struct inode_operations coda_file_inode_operations = { |
| .permission = coda_permission, |
| .getattr = coda_getattr, |
| .setattr = coda_setattr, |
| }; |
| |
| static int coda_statfs(struct dentry *dentry, struct kstatfs *buf) |
| { |
| int error; |
| |
| lock_kernel(); |
| |
| error = venus_statfs(dentry, buf); |
| |
| unlock_kernel(); |
| |
| if (error) { |
| /* fake something like AFS does */ |
| buf->f_blocks = 9000000; |
| buf->f_bfree = 9000000; |
| buf->f_bavail = 9000000; |
| buf->f_files = 9000000; |
| buf->f_ffree = 9000000; |
| } |
| |
| /* and fill in the rest */ |
| buf->f_type = CODA_SUPER_MAGIC; |
| buf->f_bsize = 4096; |
| buf->f_namelen = CODA_MAXNAMLEN; |
| |
| return 0; |
| } |
| |
| /* init_coda: used by filesystems.c to register coda */ |
| |
| static int coda_get_sb(struct file_system_type *fs_type, |
| int flags, const char *dev_name, void *data, struct vfsmount *mnt) |
| { |
| return get_sb_nodev(fs_type, flags, data, coda_fill_super, mnt); |
| } |
| |
| struct file_system_type coda_fs_type = { |
| .owner = THIS_MODULE, |
| .name = "coda", |
| .get_sb = coda_get_sb, |
| .kill_sb = kill_anon_super, |
| .fs_flags = FS_BINARY_MOUNTDATA, |
| }; |
| |