#define o2info_from_user(a, b) \
copy_from_user(&(a), (b), sizeof(a)) #define o2info_to_user(a, b) \
copy_to_user((typeof(a) __user *)b, &(a), sizeof(a))
/* * This is just a best-effort to tell userspace that this request * caused the error.
*/ staticinlinevoid o2info_set_request_error(struct ocfs2_info_request *kreq, struct ocfs2_info_request __user *req)
{
kreq->ir_flags |= OCFS2_INFO_FL_ERROR;
(void)put_user(kreq->ir_flags, (__u32 __user *)&(req->ir_flags));
}
do { if (!bg)
blkno = le64_to_cpu(rec->c_blkno); else
blkno = le64_to_cpu(bg->bg_next_group);
if (bh) {
brelse(bh);
bh = NULL;
}
if (o2info_coherent(&ffg->iff_req))
status = ocfs2_read_group_descriptor(gb_inode,
gb_dinode,
blkno, &bh); else
status = ocfs2_read_blocks_sync(osb, blkno, 1, &bh);
if (status < 0) {
mlog(ML_ERROR, "Can't read the group descriptor # " "%llu from device.", (unsignedlonglong)blkno);
status = -EIO; goto bail;
}
bg = (struct ocfs2_group_desc *)bh->b_data;
if (!le16_to_cpu(bg->bg_free_bits_count)) continue;
max_bits = le16_to_cpu(bg->bg_bits);
offset = 0;
for (chunk = 0; chunk < chunks_in_group; chunk++) { /* * last chunk may be not an entire one.
*/ if ((offset + ffg->iff_chunksize) > max_bits)
num_clusters = max_bits - offset; else
num_clusters = ffg->iff_chunksize;
chunk_free = 0; for (cluster = 0; cluster < num_clusters; cluster++) {
used = ocfs2_test_bit(offset,
(unsignedlong *)bg->bg_bitmap); /* * - chunk_free counts free clusters in #N chunk. * - last_chunksize records the size(in) clusters * for the last real free chunk being counted.
*/ if (!used) {
last_chunksize++;
chunk_free++;
}
/* * Chunksize(in) clusters from userspace should be * less than clusters in a group.
*/ if (ffg->iff_chunksize > le16_to_cpu(cl->cl_cpg)) {
status = -EINVAL; goto bail;
}
for (i = 0; i < le16_to_cpu(cl->cl_next_free_rec); i++) {
rec = &(cl->cl_recs[i]);
status = ocfs2_info_freefrag_scan_chain(osb, gb_inode,
gb_dinode,
rec, ffg,
chunks_in_group); if (status) goto bail;
}
if (ffg->iff_ffs.ffs_free_chunks_real)
ffg->iff_ffs.ffs_avg = (ffg->iff_ffs.ffs_avg /
ffg->iff_ffs.ffs_free_chunks_real);
bail: if (unlock)
ocfs2_inode_unlock(gb_inode, 0);
if (gb_inode)
inode_unlock(gb_inode);
iput(gb_inode);
brelse(bh);
return status;
}
staticint ocfs2_info_handle_freefrag(struct inode *inode, struct ocfs2_info_request __user *req)
{
u64 blkno = -1; char namebuf[40]; int status, type = GLOBAL_BITMAP_SYSTEM_INODE;
oiff = kzalloc(sizeof(struct ocfs2_info_freefrag), GFP_KERNEL); if (!oiff) {
status = -ENOMEM;
mlog_errno(status); goto out_err;
}
if (o2info_from_user(*oiff, req)) {
status = -EFAULT; goto out_free;
} /* * chunksize from userspace should be power of 2.
*/ if ((oiff->iff_chunksize & (oiff->iff_chunksize - 1)) ||
(!oiff->iff_chunksize)) {
status = -EINVAL; goto bail;
}
if (o2info_coherent(&oiff->iff_req)) {
gb_inode = ocfs2_get_system_file_inode(osb, type,
OCFS2_INVALID_SLOT); if (!gb_inode) {
mlog(ML_ERROR, "unable to get global_bitmap inode\n");
status = -EIO; goto bail;
}
} else {
ocfs2_sprintf_system_inode_name(namebuf, sizeof(namebuf), type,
OCFS2_INVALID_SLOT);
status = ocfs2_lookup_ino_from_name(osb->sys_root_inode,
namebuf,
strlen(namebuf),
&blkno); if (status < 0) {
status = -ENOENT; goto bail;
}
}
status = ocfs2_info_freefrag_scan_bitmap(osb, gb_inode, blkno, oiff); if (status < 0) goto bail;
o2info_set_request_filled(&oiff->iff_req);
if (o2info_to_user(*oiff, req)) {
status = -EFAULT; goto out_free;
}
status = 0;
bail: if (status)
o2info_set_request_error(&oiff->iff_req, req);
out_free:
kfree(oiff);
out_err: return status;
}
/* * Validate and distinguish OCFS2_IOC_INFO requests. * * - validate the magic number. * - distinguish different requests. * - validate size of different requests.
*/ staticint ocfs2_info_handle_request(struct inode *inode, struct ocfs2_info_request __user *req)
{ int status = -EFAULT; struct ocfs2_info_request oir;
if (o2info_from_user(oir, req)) goto bail;
status = -EINVAL; if (oir.ir_magic != OCFS2_INFO_MAGIC) goto bail;
switch (oir.ir_code) { case OCFS2_INFO_BLOCKSIZE: if (oir.ir_size == sizeof(struct ocfs2_info_blocksize))
status = ocfs2_info_handle_blocksize(inode, req); break; case OCFS2_INFO_CLUSTERSIZE: if (oir.ir_size == sizeof(struct ocfs2_info_clustersize))
status = ocfs2_info_handle_clustersize(inode, req); break; case OCFS2_INFO_MAXSLOTS: if (oir.ir_size == sizeof(struct ocfs2_info_maxslots))
status = ocfs2_info_handle_maxslots(inode, req); break; case OCFS2_INFO_LABEL: if (oir.ir_size == sizeof(struct ocfs2_info_label))
status = ocfs2_info_handle_label(inode, req); break; case OCFS2_INFO_UUID: if (oir.ir_size == sizeof(struct ocfs2_info_uuid))
status = ocfs2_info_handle_uuid(inode, req); break; case OCFS2_INFO_FS_FEATURES: if (oir.ir_size == sizeof(struct ocfs2_info_fs_features))
status = ocfs2_info_handle_fs_features(inode, req); break; case OCFS2_INFO_JOURNAL_SIZE: if (oir.ir_size == sizeof(struct ocfs2_info_journal_size))
status = ocfs2_info_handle_journal_size(inode, req); break; case OCFS2_INFO_FREEINODE: if (oir.ir_size == sizeof(struct ocfs2_info_freeinode))
status = ocfs2_info_handle_freeinode(inode, req); break; case OCFS2_INFO_FREEFRAG: if (oir.ir_size == sizeof(struct ocfs2_info_freefrag))
status = ocfs2_info_handle_freefrag(inode, req); break; default:
status = ocfs2_info_handle_unknown(inode, req); break;
}
bail: return status;
}
staticint ocfs2_get_request_ptr(struct ocfs2_info *info, int idx,
u64 *req_addr, int compat_flag)
{ int status = -EFAULT;
u64 __user *bp = NULL;
if (compat_flag) { #ifdef CONFIG_COMPAT /* * pointer bp stores the base address of a pointers array, * which collects all addresses of separate request.
*/
bp = (u64 __user *)(unsignedlong)compat_ptr(info->oi_requests); #else
BUG(); #endif
} else
bp = (u64 __user *)(unsignedlong)(info->oi_requests);
if (o2info_from_user(*req_addr, bp + idx)) goto bail;
status = 0;
bail: return status;
}
/* * OCFS2_IOC_INFO handles an array of requests passed from userspace. * * ocfs2_info_handle() receives a large info aggregation, grab and * validate the request count from header, then break it into small * pieces, later specific handlers can handle them one by one. * * Idea here is to make each separate request small enough to ensure * a better backward&forward compatibility, since a small piece of * request will be less likely to be broken if disk layout get changed.
*/ static noinline_for_stack int
ocfs2_info_handle(struct inode *inode, struct ocfs2_info *info, int compat_flag)
{ int i, status = 0;
u64 req_addr; struct ocfs2_info_request __user *reqp;
if ((info->oi_count > OCFS2_INFO_MAX_REQUEST) ||
(!info->oi_requests)) {
status = -EINVAL; goto bail;
}
for (i = 0; i < info->oi_count; i++) {
status = ocfs2_get_request_ptr(info, i, &req_addr, compat_flag); if (status) break;
reqp = (struct ocfs2_info_request __user *)(unsignedlong)req_addr; if (!reqp) {
status = -EINVAL; goto bail;
}
status = ocfs2_info_handle_request(inode, reqp); if (status) break;
}
switch (cmd) { case OCFS2_IOC_RESVSP: case OCFS2_IOC_RESVSP64: case OCFS2_IOC_UNRESVSP: case OCFS2_IOC_UNRESVSP64:
{ struct ocfs2_space_resv sr;
if (copy_from_user(&sr, (int __user *) arg, sizeof(sr))) return -EFAULT;
return ocfs2_change_file_space(filp, cmd, &sr);
} case OCFS2_IOC_GROUP_EXTEND:
{ int new_clusters;
if (!capable(CAP_SYS_RESOURCE)) return -EPERM;
if (get_user(new_clusters, (int __user *)arg)) return -EFAULT;
status = mnt_want_write_file(filp); if (status) return status;
status = ocfs2_group_extend(inode, new_clusters);
mnt_drop_write_file(filp); return status;
} case OCFS2_IOC_GROUP_ADD: case OCFS2_IOC_GROUP_ADD64:
{ struct ocfs2_new_group_input input;
if (!capable(CAP_SYS_RESOURCE)) return -EPERM;
if (copy_from_user(&input, (int __user *) arg, sizeof(input))) return -EFAULT;
status = mnt_want_write_file(filp); if (status) return status;
status = ocfs2_group_add(inode, &input);
mnt_drop_write_file(filp); return status;
} case OCFS2_IOC_REFLINK:
{ struct reflink_arguments args; constchar __user *old_path; constchar __user *new_path; bool preserve;
switch (cmd) { case OCFS2_IOC_RESVSP: case OCFS2_IOC_RESVSP64: case OCFS2_IOC_UNRESVSP: case OCFS2_IOC_UNRESVSP64: case OCFS2_IOC_GROUP_EXTEND: case OCFS2_IOC_GROUP_ADD: case OCFS2_IOC_GROUP_ADD64: break; case OCFS2_IOC_REFLINK: if (copy_from_user(&args, argp, sizeof(args))) return -EFAULT;
preserve = (args.preserve != 0);
return ocfs2_reflink_ioctl(inode, compat_ptr(args.old_path),
compat_ptr(args.new_path), preserve); case OCFS2_IOC_INFO: if (copy_from_user(&info, argp, sizeof(struct ocfs2_info))) return -EFAULT;
return ocfs2_info_handle(inode, &info, 1); case FITRIM: case OCFS2_IOC_MOVE_EXT: break; default: return -ENOIOCTLCMD;
}
return ocfs2_ioctl(file, cmd, arg);
} #endif
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