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/afs/super.c | 778 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 778 insertions(+) create mode 100644 fs/afs/super.c (limited to 'fs/afs/super.c') diff --git a/fs/afs/super.c b/fs/afs/super.c new file mode 100644 index 000000000..e95fb4cb4 --- /dev/null +++ b/fs/afs/super.c @@ -0,0 +1,778 @@ +/* AFS superblock handling + * + * Copyright (c) 2002, 2007, 2018 Red Hat, Inc. All rights reserved. + * + * This software may be freely redistributed under the terms of the + * GNU General Public License. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. + * + * Authors: David Howells + * David Woodhouse + * + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include "internal.h" + +static void afs_i_init_once(void *foo); +static void afs_kill_super(struct super_block *sb); +static struct inode *afs_alloc_inode(struct super_block *sb); +static void afs_destroy_inode(struct inode *inode); +static void afs_free_inode(struct inode *inode); +static int afs_statfs(struct dentry *dentry, struct kstatfs *buf); +static int afs_show_devname(struct seq_file *m, struct dentry *root); +static int afs_show_options(struct seq_file *m, struct dentry *root); +static int afs_init_fs_context(struct fs_context *fc); +static const struct fs_parameter_spec afs_fs_parameters[]; + +struct file_system_type afs_fs_type = { + .owner = THIS_MODULE, + .name = "afs", + .init_fs_context = afs_init_fs_context, + .parameters = afs_fs_parameters, + .kill_sb = afs_kill_super, + .fs_flags = FS_RENAME_DOES_D_MOVE, +}; +MODULE_ALIAS_FS("afs"); + +int afs_net_id; + +static const struct super_operations afs_super_ops = { + .statfs = afs_statfs, + .alloc_inode = afs_alloc_inode, + .write_inode = afs_write_inode, + .drop_inode = afs_drop_inode, + .destroy_inode = afs_destroy_inode, + .free_inode = afs_free_inode, + .evict_inode = afs_evict_inode, + .show_devname = afs_show_devname, + .show_options = afs_show_options, +}; + +static struct kmem_cache *afs_inode_cachep; +static atomic_t afs_count_active_inodes; + +enum afs_param { + Opt_autocell, + Opt_dyn, + Opt_flock, + Opt_source, +}; + +static const struct constant_table afs_param_flock[] = { + {"local", afs_flock_mode_local }, + {"openafs", afs_flock_mode_openafs }, + {"strict", afs_flock_mode_strict }, + {"write", afs_flock_mode_write }, + {} +}; + +static const struct fs_parameter_spec afs_fs_parameters[] = { + fsparam_flag ("autocell", Opt_autocell), + fsparam_flag ("dyn", Opt_dyn), + fsparam_enum ("flock", Opt_flock, afs_param_flock), + fsparam_string("source", Opt_source), + {} +}; + +/* + * initialise the filesystem + */ +int __init afs_fs_init(void) +{ + int ret; + + _enter(""); + + /* create ourselves an inode cache */ + atomic_set(&afs_count_active_inodes, 0); + + ret = -ENOMEM; + afs_inode_cachep = kmem_cache_create("afs_inode_cache", + sizeof(struct afs_vnode), + 0, + SLAB_HWCACHE_ALIGN|SLAB_ACCOUNT, + afs_i_init_once); + if (!afs_inode_cachep) { + printk(KERN_NOTICE "kAFS: Failed to allocate inode cache\n"); + return ret; + } + + /* now export our filesystem to lesser mortals */ + ret = register_filesystem(&afs_fs_type); + if (ret < 0) { + kmem_cache_destroy(afs_inode_cachep); + _leave(" = %d", ret); + return ret; + } + + _leave(" = 0"); + return 0; +} + +/* + * clean up the filesystem + */ +void afs_fs_exit(void) +{ + _enter(""); + + afs_mntpt_kill_timer(); + unregister_filesystem(&afs_fs_type); + + if (atomic_read(&afs_count_active_inodes) != 0) { + printk("kAFS: %d active inode objects still present\n", + atomic_read(&afs_count_active_inodes)); + BUG(); + } + + /* + * Make sure all delayed rcu free inodes are flushed before we + * destroy cache. + */ + rcu_barrier(); + kmem_cache_destroy(afs_inode_cachep); + _leave(""); +} + +/* + * Display the mount device name in /proc/mounts. + */ +static int afs_show_devname(struct seq_file *m, struct dentry *root) +{ + struct afs_super_info *as = AFS_FS_S(root->d_sb); + struct afs_volume *volume = as->volume; + struct afs_cell *cell = as->cell; + const char *suf = ""; + char pref = '%'; + + if (as->dyn_root) { + seq_puts(m, "none"); + return 0; + } + + switch (volume->type) { + case AFSVL_RWVOL: + break; + case AFSVL_ROVOL: + pref = '#'; + if (volume->type_force) + suf = ".readonly"; + break; + case AFSVL_BACKVOL: + pref = '#'; + suf = ".backup"; + break; + } + + seq_printf(m, "%c%s:%s%s", pref, cell->name, volume->name, suf); + return 0; +} + +/* + * Display the mount options in /proc/mounts. + */ +static int afs_show_options(struct seq_file *m, struct dentry *root) +{ + struct afs_super_info *as = AFS_FS_S(root->d_sb); + const char *p = NULL; + + if (as->dyn_root) + seq_puts(m, ",dyn"); + if (test_bit(AFS_VNODE_AUTOCELL, &AFS_FS_I(d_inode(root))->flags)) + seq_puts(m, ",autocell"); + switch (as->flock_mode) { + case afs_flock_mode_unset: break; + case afs_flock_mode_local: p = "local"; break; + case afs_flock_mode_openafs: p = "openafs"; break; + case afs_flock_mode_strict: p = "strict"; break; + case afs_flock_mode_write: p = "write"; break; + } + if (p) + seq_printf(m, ",flock=%s", p); + + return 0; +} + +/* + * Parse the source name to get cell name, volume name, volume type and R/W + * selector. + * + * This can be one of the following: + * "%[cell:]volume[.]" R/W volume + * "#[cell:]volume[.]" R/O or R/W volume (R/O parent), + * or R/W (R/W parent) volume + * "%[cell:]volume.readonly" R/O volume + * "#[cell:]volume.readonly" R/O volume + * "%[cell:]volume.backup" Backup volume + * "#[cell:]volume.backup" Backup volume + */ +static int afs_parse_source(struct fs_context *fc, struct fs_parameter *param) +{ + struct afs_fs_context *ctx = fc->fs_private; + struct afs_cell *cell; + const char *cellname, *suffix, *name = param->string; + int cellnamesz; + + _enter(",%s", name); + + if (fc->source) + return invalf(fc, "kAFS: Multiple sources not supported"); + + if (!name) { + printk(KERN_ERR "kAFS: no volume name specified\n"); + return -EINVAL; + } + + if ((name[0] != '%' && name[0] != '#') || !name[1]) { + /* To use dynroot, we don't want to have to provide a source */ + if (strcmp(name, "none") == 0) { + ctx->no_cell = true; + return 0; + } + printk(KERN_ERR "kAFS: unparsable volume name\n"); + return -EINVAL; + } + + /* determine the type of volume we're looking for */ + if (name[0] == '%') { + ctx->type = AFSVL_RWVOL; + ctx->force = true; + } + name++; + + /* split the cell name out if there is one */ + ctx->volname = strchr(name, ':'); + if (ctx->volname) { + cellname = name; + cellnamesz = ctx->volname - name; + ctx->volname++; + } else { + ctx->volname = name; + cellname = NULL; + cellnamesz = 0; + } + + /* the volume type is further affected by a possible suffix */ + suffix = strrchr(ctx->volname, '.'); + if (suffix) { + if (strcmp(suffix, ".readonly") == 0) { + ctx->type = AFSVL_ROVOL; + ctx->force = true; + } else if (strcmp(suffix, ".backup") == 0) { + ctx->type = AFSVL_BACKVOL; + ctx->force = true; + } else if (suffix[1] == 0) { + } else { + suffix = NULL; + } + } + + ctx->volnamesz = suffix ? + suffix - ctx->volname : strlen(ctx->volname); + + _debug("cell %*.*s [%p]", + cellnamesz, cellnamesz, cellname ?: "", ctx->cell); + + /* lookup the cell record */ + if (cellname) { + cell = afs_lookup_cell(ctx->net, cellname, cellnamesz, + NULL, false); + if (IS_ERR(cell)) { + pr_err("kAFS: unable to lookup cell '%*.*s'\n", + cellnamesz, cellnamesz, cellname ?: ""); + return PTR_ERR(cell); + } + afs_unuse_cell(ctx->net, ctx->cell, afs_cell_trace_unuse_parse); + afs_see_cell(cell, afs_cell_trace_see_source); + ctx->cell = cell; + } + + _debug("CELL:%s [%p] VOLUME:%*.*s SUFFIX:%s TYPE:%d%s", + ctx->cell->name, ctx->cell, + ctx->volnamesz, ctx->volnamesz, ctx->volname, + suffix ?: "-", ctx->type, ctx->force ? " FORCE" : ""); + + fc->source = param->string; + param->string = NULL; + return 0; +} + +/* + * Parse a single mount parameter. + */ +static int afs_parse_param(struct fs_context *fc, struct fs_parameter *param) +{ + struct fs_parse_result result; + struct afs_fs_context *ctx = fc->fs_private; + int opt; + + opt = fs_parse(fc, afs_fs_parameters, param, &result); + if (opt < 0) + return opt; + + switch (opt) { + case Opt_source: + return afs_parse_source(fc, param); + + case Opt_autocell: + ctx->autocell = true; + break; + + case Opt_dyn: + ctx->dyn_root = true; + break; + + case Opt_flock: + ctx->flock_mode = result.uint_32; + break; + + default: + return -EINVAL; + } + + _leave(" = 0"); + return 0; +} + +/* + * Validate the options, get the cell key and look up the volume. + */ +static int afs_validate_fc(struct fs_context *fc) +{ + struct afs_fs_context *ctx = fc->fs_private; + struct afs_volume *volume; + struct afs_cell *cell; + struct key *key; + int ret; + + if (!ctx->dyn_root) { + if (ctx->no_cell) { + pr_warn("kAFS: Can only specify source 'none' with -o dyn\n"); + return -EINVAL; + } + + if (!ctx->cell) { + pr_warn("kAFS: No cell specified\n"); + return -EDESTADDRREQ; + } + + reget_key: + /* We try to do the mount securely. */ + key = afs_request_key(ctx->cell); + if (IS_ERR(key)) + return PTR_ERR(key); + + ctx->key = key; + + if (ctx->volume) { + afs_put_volume(ctx->net, ctx->volume, + afs_volume_trace_put_validate_fc); + ctx->volume = NULL; + } + + if (test_bit(AFS_CELL_FL_CHECK_ALIAS, &ctx->cell->flags)) { + ret = afs_cell_detect_alias(ctx->cell, key); + if (ret < 0) + return ret; + if (ret == 1) { + _debug("switch to alias"); + key_put(ctx->key); + ctx->key = NULL; + cell = afs_use_cell(ctx->cell->alias_of, + afs_cell_trace_use_fc_alias); + afs_unuse_cell(ctx->net, ctx->cell, afs_cell_trace_unuse_fc); + ctx->cell = cell; + goto reget_key; + } + } + + volume = afs_create_volume(ctx); + if (IS_ERR(volume)) + return PTR_ERR(volume); + + ctx->volume = volume; + if (volume->type != AFSVL_RWVOL) + ctx->flock_mode = afs_flock_mode_local; + } + + return 0; +} + +/* + * check a superblock to see if it's the one we're looking for + */ +static int afs_test_super(struct super_block *sb, struct fs_context *fc) +{ + struct afs_fs_context *ctx = fc->fs_private; + struct afs_super_info *as = AFS_FS_S(sb); + + return (as->net_ns == fc->net_ns && + as->volume && + as->volume->vid == ctx->volume->vid && + as->cell == ctx->cell && + !as->dyn_root); +} + +static int afs_dynroot_test_super(struct super_block *sb, struct fs_context *fc) +{ + struct afs_super_info *as = AFS_FS_S(sb); + + return (as->net_ns == fc->net_ns && + as->dyn_root); +} + +static int afs_set_super(struct super_block *sb, struct fs_context *fc) +{ + return set_anon_super(sb, NULL); +} + +/* + * fill in the superblock + */ +static int afs_fill_super(struct super_block *sb, struct afs_fs_context *ctx) +{ + struct afs_super_info *as = AFS_FS_S(sb); + struct inode *inode = NULL; + int ret; + + _enter(""); + + /* fill in the superblock */ + sb->s_blocksize = PAGE_SIZE; + sb->s_blocksize_bits = PAGE_SHIFT; + sb->s_maxbytes = MAX_LFS_FILESIZE; + sb->s_magic = AFS_FS_MAGIC; + sb->s_op = &afs_super_ops; + if (!as->dyn_root) + sb->s_xattr = afs_xattr_handlers; + ret = super_setup_bdi(sb); + if (ret) + return ret; + + /* allocate the root inode and dentry */ + if (as->dyn_root) { + inode = afs_iget_pseudo_dir(sb, true); + } else { + sprintf(sb->s_id, "%llu", as->volume->vid); + afs_activate_volume(as->volume); + inode = afs_root_iget(sb, ctx->key); + } + + if (IS_ERR(inode)) + return PTR_ERR(inode); + + if (ctx->autocell || as->dyn_root) + set_bit(AFS_VNODE_AUTOCELL, &AFS_FS_I(inode)->flags); + + ret = -ENOMEM; + sb->s_root = d_make_root(inode); + if (!sb->s_root) + goto error; + + if (as->dyn_root) { + sb->s_d_op = &afs_dynroot_dentry_operations; + ret = afs_dynroot_populate(sb); + if (ret < 0) + goto error; + } else { + sb->s_d_op = &afs_fs_dentry_operations; + rcu_assign_pointer(as->volume->sb, sb); + } + + _leave(" = 0"); + return 0; + +error: + _leave(" = %d", ret); + return ret; +} + +static struct afs_super_info *afs_alloc_sbi(struct fs_context *fc) +{ + struct afs_fs_context *ctx = fc->fs_private; + struct afs_super_info *as; + + as = kzalloc(sizeof(struct afs_super_info), GFP_KERNEL); + if (as) { + as->net_ns = get_net(fc->net_ns); + as->flock_mode = ctx->flock_mode; + if (ctx->dyn_root) { + as->dyn_root = true; + } else { + as->cell = afs_use_cell(ctx->cell, afs_cell_trace_use_sbi); + as->volume = afs_get_volume(ctx->volume, + afs_volume_trace_get_alloc_sbi); + } + } + return as; +} + +static void afs_destroy_sbi(struct afs_super_info *as) +{ + if (as) { + struct afs_net *net = afs_net(as->net_ns); + afs_put_volume(net, as->volume, afs_volume_trace_put_destroy_sbi); + afs_unuse_cell(net, as->cell, afs_cell_trace_unuse_sbi); + put_net(as->net_ns); + kfree(as); + } +} + +static void afs_kill_super(struct super_block *sb) +{ + struct afs_super_info *as = AFS_FS_S(sb); + + if (as->dyn_root) + afs_dynroot_depopulate(sb); + + /* Clear the callback interests (which will do ilookup5) before + * deactivating the superblock. + */ + if (as->volume) + rcu_assign_pointer(as->volume->sb, NULL); + kill_anon_super(sb); + if (as->volume) + afs_deactivate_volume(as->volume); + afs_destroy_sbi(as); +} + +/* + * Get an AFS superblock and root directory. + */ +static int afs_get_tree(struct fs_context *fc) +{ + struct afs_fs_context *ctx = fc->fs_private; + struct super_block *sb; + struct afs_super_info *as; + int ret; + + ret = afs_validate_fc(fc); + if (ret) + goto error; + + _enter(""); + + /* allocate a superblock info record */ + ret = -ENOMEM; + as = afs_alloc_sbi(fc); + if (!as) + goto error; + fc->s_fs_info = as; + + /* allocate a deviceless superblock */ + sb = sget_fc(fc, + as->dyn_root ? afs_dynroot_test_super : afs_test_super, + afs_set_super); + if (IS_ERR(sb)) { + ret = PTR_ERR(sb); + goto error; + } + + if (!sb->s_root) { + /* initial superblock/root creation */ + _debug("create"); + ret = afs_fill_super(sb, ctx); + if (ret < 0) + goto error_sb; + sb->s_flags |= SB_ACTIVE; + } else { + _debug("reuse"); + ASSERTCMP(sb->s_flags, &, SB_ACTIVE); + } + + fc->root = dget(sb->s_root); + trace_afs_get_tree(as->cell, as->volume); + _leave(" = 0 [%p]", sb); + return 0; + +error_sb: + deactivate_locked_super(sb); +error: + _leave(" = %d", ret); + return ret; +} + +static void afs_free_fc(struct fs_context *fc) +{ + struct afs_fs_context *ctx = fc->fs_private; + + afs_destroy_sbi(fc->s_fs_info); + afs_put_volume(ctx->net, ctx->volume, afs_volume_trace_put_free_fc); + afs_unuse_cell(ctx->net, ctx->cell, afs_cell_trace_unuse_fc); + key_put(ctx->key); + kfree(ctx); +} + +static const struct fs_context_operations afs_context_ops = { + .free = afs_free_fc, + .parse_param = afs_parse_param, + .get_tree = afs_get_tree, +}; + +/* + * Set up the filesystem mount context. + */ +static int afs_init_fs_context(struct fs_context *fc) +{ + struct afs_fs_context *ctx; + struct afs_cell *cell; + + ctx = kzalloc(sizeof(struct afs_fs_context), GFP_KERNEL); + if (!ctx) + return -ENOMEM; + + ctx->type = AFSVL_ROVOL; + ctx->net = afs_net(fc->net_ns); + + /* Default to the workstation cell. */ + cell = afs_find_cell(ctx->net, NULL, 0, afs_cell_trace_use_fc); + if (IS_ERR(cell)) + cell = NULL; + ctx->cell = cell; + + fc->fs_private = ctx; + fc->ops = &afs_context_ops; + return 0; +} + +/* + * Initialise an inode cache slab element prior to any use. Note that + * afs_alloc_inode() *must* reset anything that could incorrectly leak from one + * inode to another. + */ +static void afs_i_init_once(void *_vnode) +{ + struct afs_vnode *vnode = _vnode; + + memset(vnode, 0, sizeof(*vnode)); + inode_init_once(&vnode->netfs.inode); + mutex_init(&vnode->io_lock); + init_rwsem(&vnode->validate_lock); + spin_lock_init(&vnode->wb_lock); + spin_lock_init(&vnode->lock); + INIT_LIST_HEAD(&vnode->wb_keys); + INIT_LIST_HEAD(&vnode->pending_locks); + INIT_LIST_HEAD(&vnode->granted_locks); + INIT_DELAYED_WORK(&vnode->lock_work, afs_lock_work); + INIT_LIST_HEAD(&vnode->cb_mmap_link); + seqlock_init(&vnode->cb_lock); +} + +/* + * allocate an AFS inode struct from our slab cache + */ +static struct inode *afs_alloc_inode(struct super_block *sb) +{ + struct afs_vnode *vnode; + + vnode = alloc_inode_sb(sb, afs_inode_cachep, GFP_KERNEL); + if (!vnode) + return NULL; + + atomic_inc(&afs_count_active_inodes); + + /* Reset anything that shouldn't leak from one inode to the next. */ + memset(&vnode->fid, 0, sizeof(vnode->fid)); + memset(&vnode->status, 0, sizeof(vnode->status)); + afs_vnode_set_cache(vnode, NULL); + + vnode->volume = NULL; + vnode->lock_key = NULL; + vnode->permit_cache = NULL; + + vnode->flags = 1 << AFS_VNODE_UNSET; + vnode->lock_state = AFS_VNODE_LOCK_NONE; + + init_rwsem(&vnode->rmdir_lock); + INIT_WORK(&vnode->cb_work, afs_invalidate_mmap_work); + + _leave(" = %p", &vnode->netfs.inode); + return &vnode->netfs.inode; +} + +static void afs_free_inode(struct inode *inode) +{ + kmem_cache_free(afs_inode_cachep, AFS_FS_I(inode)); +} + +/* + * destroy an AFS inode struct + */ +static void afs_destroy_inode(struct inode *inode) +{ + struct afs_vnode *vnode = AFS_FS_I(inode); + + _enter("%p{%llx:%llu}", inode, vnode->fid.vid, vnode->fid.vnode); + + _debug("DESTROY INODE %p", inode); + + atomic_dec(&afs_count_active_inodes); +} + +static void afs_get_volume_status_success(struct afs_operation *op) +{ + struct afs_volume_status *vs = &op->volstatus.vs; + struct kstatfs *buf = op->volstatus.buf; + + if (vs->max_quota == 0) + buf->f_blocks = vs->part_max_blocks; + else + buf->f_blocks = vs->max_quota; + + if (buf->f_blocks > vs->blocks_in_use) + buf->f_bavail = buf->f_bfree = + buf->f_blocks - vs->blocks_in_use; +} + +static const struct afs_operation_ops afs_get_volume_status_operation = { + .issue_afs_rpc = afs_fs_get_volume_status, + .issue_yfs_rpc = yfs_fs_get_volume_status, + .success = afs_get_volume_status_success, +}; + +/* + * return information about an AFS volume + */ +static int afs_statfs(struct dentry *dentry, struct kstatfs *buf) +{ + struct afs_super_info *as = AFS_FS_S(dentry->d_sb); + struct afs_operation *op; + struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry)); + + buf->f_type = dentry->d_sb->s_magic; + buf->f_bsize = AFS_BLOCK_SIZE; + buf->f_namelen = AFSNAMEMAX - 1; + + if (as->dyn_root) { + buf->f_blocks = 1; + buf->f_bavail = 0; + buf->f_bfree = 0; + return 0; + } + + op = afs_alloc_operation(NULL, as->volume); + if (IS_ERR(op)) + return PTR_ERR(op); + + afs_op_set_vnode(op, 0, vnode); + op->nr_files = 1; + op->volstatus.buf = buf; + op->ops = &afs_get_volume_status_operation; + return afs_do_sync_operation(op); +} -- cgit v1.2.3