From 2c3c1048746a4622d8c89a29670120dc8fab93c4 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 20:49:45 +0200 Subject: Adding upstream version 6.1.76. Signed-off-by: Daniel Baumann --- fs/coda/inode.c | 331 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 331 insertions(+) create mode 100644 fs/coda/inode.c (limited to 'fs/coda/inode.c') diff --git a/fs/coda/inode.c b/fs/coda/inode.c new file mode 100644 index 000000000..2185328b6 --- /dev/null +++ b/fs/coda/inode.c @@ -0,0 +1,331 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Super block/filesystem wide operations + * + * Copyright (C) 1996 Peter J. Braam and + * Michael Callahan + * + * Rewritten for Linux 2.1. Peter Braam + * Copyright (C) Carnegie Mellon University + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include "coda_psdev.h" +#include "coda_linux.h" +#include "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 = alloc_inode_sb(sb, coda_inode_cachep, GFP_KERNEL); + if (!ei) + return NULL; + memset(&ei->c_fid, 0, sizeof(struct CodaFid)); + ei->c_flags = 0; + ei->c_uid = GLOBAL_ROOT_UID; + ei->c_cached_perm = 0; + spin_lock_init(&ei->c_lock); + return &ei->vfs_inode; +} + +static void coda_free_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 __init 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| + SLAB_ACCOUNT, init_once); + if (coda_inode_cachep == NULL) + return -ENOMEM; + return 0; +} + +void coda_destroy_inodecache(void) +{ + /* + * Make sure all delayed rcu free inodes are flushed before we + * destroy cache. + */ + rcu_barrier(); + kmem_cache_destroy(coda_inode_cachep); +} + +static int coda_remount(struct super_block *sb, int *flags, char *data) +{ + sync_filesystem(sb); + *flags |= SB_NOATIME; + return 0; +} + +/* exported operations */ +static const struct super_operations coda_super_operations = +{ + .alloc_inode = coda_alloc_inode, + .free_inode = coda_free_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 fd f; + struct inode *inode; + int idx; + + if (data == NULL) { + pr_warn("%s: Bad mount data\n", __func__); + return -1; + } + + if (data->version != CODA_MOUNT_VERSION) { + pr_warn("%s: Bad mount version\n", __func__); + return -1; + } + + f = fdget(data->fd); + if (!f.file) + goto Ebadf; + inode = file_inode(f.file); + if (!S_ISCHR(inode->i_mode) || imajor(inode) != CODA_PSDEV_MAJOR) { + fdput(f); + goto Ebadf; + } + + idx = iminor(inode); + fdput(f); + + if (idx < 0 || idx >= MAX_CODADEVS) { + pr_warn("%s: Bad minor number\n", __func__); + return -1; + } + + return idx; +Ebadf: + pr_warn("%s: Bad file\n", __func__); + return -1; +} + +static int coda_fill_super(struct super_block *sb, void *data, int silent) +{ + struct inode *root = NULL; + struct venus_comm *vc; + struct CodaFid fid; + int error; + int idx; + + if (task_active_pid_ns(current) != &init_pid_ns) + return -EINVAL; + + idx = get_device_index((struct coda_mount_data *) data); + + /* Ignore errors in data, for backward compatibility */ + if(idx == -1) + idx = 0; + + pr_info("%s: device index: %i\n", __func__, idx); + + vc = &coda_comms[idx]; + mutex_lock(&vc->vc_mutex); + + if (!vc->vc_inuse) { + pr_warn("%s: No pseudo device\n", __func__); + error = -EINVAL; + goto unlock_out; + } + + if (vc->vc_sb) { + pr_warn("%s: Device already mounted\n", __func__); + error = -EBUSY; + goto unlock_out; + } + + vc->vc_sb = sb; + mutex_unlock(&vc->vc_mutex); + + sb->s_fs_info = vc; + sb->s_flags |= SB_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_d_op = &coda_dentry_operations; + sb->s_time_gran = 1; + sb->s_time_min = S64_MIN; + sb->s_time_max = S64_MAX; + + error = super_setup_bdi(sb); + if (error) + goto error; + + /* get root fid from Venus: this needs the root inode */ + error = venus_rootfid(sb, &fid); + if ( error ) { + pr_warn("%s: coda_get_rootfid failed with %d\n", + __func__, error); + goto error; + } + pr_info("%s: rootfid is %s\n", __func__, coda_f2s(&fid)); + + /* make root inode */ + root = coda_cnode_make(&fid, sb); + if (IS_ERR(root)) { + error = PTR_ERR(root); + pr_warn("Failure of coda_cnode_make for root: error %d\n", + error); + goto error; + } + + pr_info("%s: rootinode is %ld dev %s\n", + __func__, root->i_ino, root->i_sb->s_id); + sb->s_root = d_make_root(root); + if (!sb->s_root) { + error = -EINVAL; + goto error; + } + return 0; + +error: + mutex_lock(&vc->vc_mutex); + vc->vc_sb = NULL; + sb->s_fs_info = NULL; +unlock_out: + mutex_unlock(&vc->vc_mutex); + return error; +} + +static void coda_put_super(struct super_block *sb) +{ + struct venus_comm *vcp = coda_vcp(sb); + mutex_lock(&vcp->vc_mutex); + vcp->vc_sb = NULL; + sb->s_fs_info = NULL; + mutex_unlock(&vcp->vc_mutex); + mutex_destroy(&vcp->vc_mutex); + + pr_info("Bye bye.\n"); +} + +static void coda_evict_inode(struct inode *inode) +{ + truncate_inode_pages_final(&inode->i_data); + clear_inode(inode); + coda_cache_clear_inode(inode); +} + +int coda_getattr(struct user_namespace *mnt_userns, const struct path *path, + struct kstat *stat, u32 request_mask, unsigned int flags) +{ + int err = coda_revalidate_inode(d_inode(path->dentry)); + if (!err) + generic_fillattr(&init_user_ns, d_inode(path->dentry), stat); + return err; +} + +int coda_setattr(struct user_namespace *mnt_userns, struct dentry *de, + struct iattr *iattr) +{ + struct inode *inode = d_inode(de); + struct coda_vattr vattr; + int error; + + memset(&vattr, 0, sizeof(vattr)); + + inode->i_ctime = current_time(inode); + 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); + } + 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; + + error = venus_statfs(dentry, buf); + + 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 struct dentry *coda_mount(struct file_system_type *fs_type, + int flags, const char *dev_name, void *data) +{ + return mount_nodev(fs_type, flags, data, coda_fill_super); +} + +struct file_system_type coda_fs_type = { + .owner = THIS_MODULE, + .name = "coda", + .mount = coda_mount, + .kill_sb = kill_anon_super, + .fs_flags = FS_BINARY_MOUNTDATA, +}; +MODULE_ALIAS_FS("coda"); + -- cgit v1.2.3