From ace9429bb58fd418f0c81d4c2835699bddf6bde6 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Thu, 11 Apr 2024 10:27:49 +0200 Subject: Adding upstream version 6.6.15. Signed-off-by: Daniel Baumann --- fs/afs/xattr.c | 363 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 363 insertions(+) create mode 100644 fs/afs/xattr.c (limited to 'fs/afs/xattr.c') diff --git a/fs/afs/xattr.c b/fs/afs/xattr.c new file mode 100644 index 0000000000..9048d8ccc7 --- /dev/null +++ b/fs/afs/xattr.c @@ -0,0 +1,363 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* Extended attribute handling for AFS. We use xattrs to get and set metadata + * instead of providing pioctl(). + * + * Copyright (C) 2017 Red Hat, Inc. All Rights Reserved. + * Written by David Howells (dhowells@redhat.com) + */ + +#include +#include +#include +#include "internal.h" + +/* + * Deal with the result of a successful fetch ACL operation. + */ +static void afs_acl_success(struct afs_operation *op) +{ + afs_vnode_commit_status(op, &op->file[0]); +} + +static void afs_acl_put(struct afs_operation *op) +{ + kfree(op->acl); +} + +static const struct afs_operation_ops afs_fetch_acl_operation = { + .issue_afs_rpc = afs_fs_fetch_acl, + .success = afs_acl_success, + .put = afs_acl_put, +}; + +/* + * Get a file's ACL. + */ +static int afs_xattr_get_acl(const struct xattr_handler *handler, + struct dentry *dentry, + struct inode *inode, const char *name, + void *buffer, size_t size) +{ + struct afs_operation *op; + struct afs_vnode *vnode = AFS_FS_I(inode); + struct afs_acl *acl = NULL; + int ret; + + op = afs_alloc_operation(NULL, vnode->volume); + if (IS_ERR(op)) + return -ENOMEM; + + afs_op_set_vnode(op, 0, vnode); + op->ops = &afs_fetch_acl_operation; + + afs_begin_vnode_operation(op); + afs_wait_for_operation(op); + acl = op->acl; + op->acl = NULL; + ret = afs_put_operation(op); + + if (ret == 0) { + ret = acl->size; + if (size > 0) { + if (acl->size <= size) + memcpy(buffer, acl->data, acl->size); + else + ret = -ERANGE; + } + } + + kfree(acl); + return ret; +} + +static bool afs_make_acl(struct afs_operation *op, + const void *buffer, size_t size) +{ + struct afs_acl *acl; + + acl = kmalloc(sizeof(*acl) + size, GFP_KERNEL); + if (!acl) { + afs_op_nomem(op); + return false; + } + + acl->size = size; + memcpy(acl->data, buffer, size); + op->acl = acl; + return true; +} + +static const struct afs_operation_ops afs_store_acl_operation = { + .issue_afs_rpc = afs_fs_store_acl, + .success = afs_acl_success, + .put = afs_acl_put, +}; + +/* + * Set a file's AFS3 ACL. + */ +static int afs_xattr_set_acl(const struct xattr_handler *handler, + struct mnt_idmap *idmap, + struct dentry *dentry, + struct inode *inode, const char *name, + const void *buffer, size_t size, int flags) +{ + struct afs_operation *op; + struct afs_vnode *vnode = AFS_FS_I(inode); + + if (flags == XATTR_CREATE) + return -EINVAL; + + op = afs_alloc_operation(NULL, vnode->volume); + if (IS_ERR(op)) + return -ENOMEM; + + afs_op_set_vnode(op, 0, vnode); + if (!afs_make_acl(op, buffer, size)) + return afs_put_operation(op); + + op->ops = &afs_store_acl_operation; + return afs_do_sync_operation(op); +} + +static const struct xattr_handler afs_xattr_afs_acl_handler = { + .name = "afs.acl", + .get = afs_xattr_get_acl, + .set = afs_xattr_set_acl, +}; + +static const struct afs_operation_ops yfs_fetch_opaque_acl_operation = { + .issue_yfs_rpc = yfs_fs_fetch_opaque_acl, + .success = afs_acl_success, + /* Don't free op->yacl in .put here */ +}; + +/* + * Get a file's YFS ACL. + */ +static int afs_xattr_get_yfs(const struct xattr_handler *handler, + struct dentry *dentry, + struct inode *inode, const char *name, + void *buffer, size_t size) +{ + struct afs_operation *op; + struct afs_vnode *vnode = AFS_FS_I(inode); + struct yfs_acl *yacl = NULL; + char buf[16], *data; + int which = 0, dsize, ret = -ENOMEM; + + if (strcmp(name, "acl") == 0) + which = 0; + else if (strcmp(name, "acl_inherited") == 0) + which = 1; + else if (strcmp(name, "acl_num_cleaned") == 0) + which = 2; + else if (strcmp(name, "vol_acl") == 0) + which = 3; + else + return -EOPNOTSUPP; + + yacl = kzalloc(sizeof(struct yfs_acl), GFP_KERNEL); + if (!yacl) + goto error; + + if (which == 0) + yacl->flags |= YFS_ACL_WANT_ACL; + else if (which == 3) + yacl->flags |= YFS_ACL_WANT_VOL_ACL; + + op = afs_alloc_operation(NULL, vnode->volume); + if (IS_ERR(op)) + goto error_yacl; + + afs_op_set_vnode(op, 0, vnode); + op->yacl = yacl; + op->ops = &yfs_fetch_opaque_acl_operation; + + afs_begin_vnode_operation(op); + afs_wait_for_operation(op); + ret = afs_put_operation(op); + + if (ret == 0) { + switch (which) { + case 0: + data = yacl->acl->data; + dsize = yacl->acl->size; + break; + case 1: + data = buf; + dsize = scnprintf(buf, sizeof(buf), "%u", yacl->inherit_flag); + break; + case 2: + data = buf; + dsize = scnprintf(buf, sizeof(buf), "%u", yacl->num_cleaned); + break; + case 3: + data = yacl->vol_acl->data; + dsize = yacl->vol_acl->size; + break; + default: + ret = -EOPNOTSUPP; + goto error_yacl; + } + + ret = dsize; + if (size > 0) { + if (dsize <= size) + memcpy(buffer, data, dsize); + else + ret = -ERANGE; + } + } else if (ret == -ENOTSUPP) { + ret = -ENODATA; + } + +error_yacl: + yfs_free_opaque_acl(yacl); +error: + return ret; +} + +static const struct afs_operation_ops yfs_store_opaque_acl2_operation = { + .issue_yfs_rpc = yfs_fs_store_opaque_acl2, + .success = afs_acl_success, + .put = afs_acl_put, +}; + +/* + * Set a file's YFS ACL. + */ +static int afs_xattr_set_yfs(const struct xattr_handler *handler, + struct mnt_idmap *idmap, + struct dentry *dentry, + struct inode *inode, const char *name, + const void *buffer, size_t size, int flags) +{ + struct afs_operation *op; + struct afs_vnode *vnode = AFS_FS_I(inode); + int ret; + + if (flags == XATTR_CREATE || + strcmp(name, "acl") != 0) + return -EINVAL; + + op = afs_alloc_operation(NULL, vnode->volume); + if (IS_ERR(op)) + return -ENOMEM; + + afs_op_set_vnode(op, 0, vnode); + if (!afs_make_acl(op, buffer, size)) + return afs_put_operation(op); + + op->ops = &yfs_store_opaque_acl2_operation; + ret = afs_do_sync_operation(op); + if (ret == -ENOTSUPP) + ret = -ENODATA; + return ret; +} + +static const struct xattr_handler afs_xattr_yfs_handler = { + .prefix = "afs.yfs.", + .get = afs_xattr_get_yfs, + .set = afs_xattr_set_yfs, +}; + +/* + * Get the name of the cell on which a file resides. + */ +static int afs_xattr_get_cell(const struct xattr_handler *handler, + struct dentry *dentry, + struct inode *inode, const char *name, + void *buffer, size_t size) +{ + struct afs_vnode *vnode = AFS_FS_I(inode); + struct afs_cell *cell = vnode->volume->cell; + size_t namelen; + + namelen = cell->name_len; + if (size == 0) + return namelen; + if (namelen > size) + return -ERANGE; + memcpy(buffer, cell->name, namelen); + return namelen; +} + +static const struct xattr_handler afs_xattr_afs_cell_handler = { + .name = "afs.cell", + .get = afs_xattr_get_cell, +}; + +/* + * Get the volume ID, vnode ID and vnode uniquifier of a file as a sequence of + * hex numbers separated by colons. + */ +static int afs_xattr_get_fid(const struct xattr_handler *handler, + struct dentry *dentry, + struct inode *inode, const char *name, + void *buffer, size_t size) +{ + struct afs_vnode *vnode = AFS_FS_I(inode); + char text[16 + 1 + 24 + 1 + 8 + 1]; + size_t len; + + /* The volume ID is 64-bit, the vnode ID is 96-bit and the + * uniquifier is 32-bit. + */ + len = scnprintf(text, sizeof(text), "%llx:", vnode->fid.vid); + if (vnode->fid.vnode_hi) + len += scnprintf(text + len, sizeof(text) - len, "%x%016llx", + vnode->fid.vnode_hi, vnode->fid.vnode); + else + len += scnprintf(text + len, sizeof(text) - len, "%llx", + vnode->fid.vnode); + len += scnprintf(text + len, sizeof(text) - len, ":%x", + vnode->fid.unique); + + if (size == 0) + return len; + if (len > size) + return -ERANGE; + memcpy(buffer, text, len); + return len; +} + +static const struct xattr_handler afs_xattr_afs_fid_handler = { + .name = "afs.fid", + .get = afs_xattr_get_fid, +}; + +/* + * Get the name of the volume on which a file resides. + */ +static int afs_xattr_get_volume(const struct xattr_handler *handler, + struct dentry *dentry, + struct inode *inode, const char *name, + void *buffer, size_t size) +{ + struct afs_vnode *vnode = AFS_FS_I(inode); + const char *volname = vnode->volume->name; + size_t namelen; + + namelen = strlen(volname); + if (size == 0) + return namelen; + if (namelen > size) + return -ERANGE; + memcpy(buffer, volname, namelen); + return namelen; +} + +static const struct xattr_handler afs_xattr_afs_volume_handler = { + .name = "afs.volume", + .get = afs_xattr_get_volume, +}; + +const struct xattr_handler *afs_xattr_handlers[] = { + &afs_xattr_afs_acl_handler, + &afs_xattr_afs_cell_handler, + &afs_xattr_afs_fid_handler, + &afs_xattr_afs_volume_handler, + &afs_xattr_yfs_handler, /* afs.yfs. prefix */ + NULL +}; -- cgit v1.2.3