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https://github.com/kdave/btrfs-progs
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b276e4bc50
mount(8) will canonicalize pathnames before passing them to the kernel. Links to e.g. /dev/sda will be resolved to /dev/sda. Links to /dev/dm-# will be resolved using the name of the device mapper table to /dev/mapper/<name>. Btrfs will use whatever name the user passes to it, regardless of whether it is canonical or not. That means that if a 'btrfs device ready' is issued on any device node pointing to the original device, it will adopt the new name instead of the name that was used during mount. Mounting using /dev/sdb2 will result in df: /dev/sdb2 209715200 39328 207577088 1% /mnt lrwxrwxrwx 1 root root 4 Jun 4 13:36 /dev/whatever-i-like -> sdb2 /dev/whatever-i-like 209715200 39328 207577088 1% /mnt Likewise, mounting with /dev/mapper/whatever and using /dev/dm-0 with a btrfs device command results in df showing /dev/dm-0. This can happen with multipath devices with friendly names enabled and doing something like 'partprobe' which (at least with our version) ends up issuing a 'change' uevent on the sysfs node. That *always* uses the dm-# name, and we get confused users. This patch does the same canonicalization of the paths that mount does so that we don't end up having inconsistent names reported by ->show_devices later. Signed-off-by: Jeff Mahoney <jeffm@suse.com> [use PATH_MAX in canonicalize_dm_name] Signed-off-by: David Sterba <dsterba@suse.cz>
109 lines
4.2 KiB
C
109 lines
4.2 KiB
C
/*
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* Copyright (C) 2007 Oracle. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public
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* License v2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public
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* License along with this program; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 021110-1307, USA.
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*/
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#ifndef __UTILS__
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#define __UTILS__
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#include <sys/stat.h>
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#include "ctree.h"
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#include <dirent.h>
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#define BTRFS_MKFS_SYSTEM_GROUP_SIZE (4 * 1024 * 1024)
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#define BTRFS_SCAN_PROC (1ULL << 0)
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#define BTRFS_SCAN_DEV (1ULL << 1)
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#define BTRFS_SCAN_MOUNTED (1ULL << 2)
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#define BTRFS_SCAN_LBLKID (1ULL << 3)
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#define BTRFS_UPDATE_KERNEL 1
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#define BTRFS_ARG_UNKNOWN 0
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#define BTRFS_ARG_MNTPOINT 1
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#define BTRFS_ARG_UUID 2
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#define BTRFS_ARG_BLKDEV 3
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#define BTRFS_UUID_UNPARSED_SIZE 37
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int make_btrfs(int fd, const char *device, const char *label,
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char *fs_uuid, u64 blocks[6], u64 num_bytes, u32 nodesize,
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u32 leafsize, u32 sectorsize, u32 stripesize, u64 features);
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int btrfs_make_root_dir(struct btrfs_trans_handle *trans,
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struct btrfs_root *root, u64 objectid);
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int btrfs_prepare_device(int fd, char *file, int zero_end, u64 *block_count_ret,
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u64 max_block_count, int *mixed, int discard);
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int btrfs_add_to_fsid(struct btrfs_trans_handle *trans,
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struct btrfs_root *root, int fd, char *path,
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u64 block_count, u32 io_width, u32 io_align,
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u32 sectorsize);
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int btrfs_scan_for_fsid(int run_ioctls);
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void btrfs_register_one_device(char *fname);
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int btrfs_scan_one_dir(char *dirname, int run_ioctl);
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char *canonicalize_dm_name(const char *ptname);
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char *canonicalize_path(const char *path);
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int check_mounted(const char *devicename);
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int check_mounted_where(int fd, const char *file, char *where, int size,
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struct btrfs_fs_devices **fs_devices_mnt);
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int btrfs_device_already_in_root(struct btrfs_root *root, int fd,
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int super_offset);
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int pretty_size_snprintf(u64 size, char *str, size_t str_bytes);
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#define pretty_size(size) \
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({ \
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static __thread char _str[24]; \
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(void)pretty_size_snprintf((size), _str, sizeof(_str)); \
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_str; \
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})
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int get_mountpt(char *dev, char *mntpt, size_t size);
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int btrfs_scan_block_devices(int run_ioctl);
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u64 parse_size(char *s);
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u64 arg_strtou64(const char *str);
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int open_file_or_dir(const char *fname, DIR **dirstream);
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int open_file_or_dir3(const char *fname, DIR **dirstream, int open_flags);
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void close_file_or_dir(int fd, DIR *dirstream);
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int get_fs_info(char *path, struct btrfs_ioctl_fs_info_args *fi_args,
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struct btrfs_ioctl_dev_info_args **di_ret);
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int get_label(const char *btrfs_dev, char *label);
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int set_label(const char *btrfs_dev, const char *label);
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char *__strncpy__null(char *dest, const char *src, size_t n);
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int is_block_device(const char *file);
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int is_mount_point(const char *file);
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int open_path_or_dev_mnt(const char *path, DIR **dirstream);
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u64 btrfs_device_size(int fd, struct stat *st);
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/* Helper to always get proper size of the destination string */
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#define strncpy_null(dest, src) __strncpy__null(dest, src, sizeof(dest))
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int test_dev_for_mkfs(char *file, int force_overwrite, char *estr);
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int scan_for_btrfs(int where, int update_kernel);
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int get_label_mounted(const char *mount_path, char *labelp);
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int test_num_disk_vs_raid(u64 metadata_profile, u64 data_profile,
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u64 dev_cnt, int mixed, char *estr);
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int is_vol_small(char *file);
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int csum_tree_block(struct btrfs_root *root, struct extent_buffer *buf,
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int verify);
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int ask_user(char *question);
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int lookup_ino_rootid(int fd, u64 *rootid);
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int btrfs_scan_lblkid(int update_kernel);
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int get_btrfs_mount(const char *dev, char *mp, size_t mp_size);
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int find_mount_root(const char *path, char **mount_root);
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int get_device_info(int fd, u64 devid,
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struct btrfs_ioctl_dev_info_args *di_args);
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int test_uuid_unique(char *fs_uuid);
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#endif
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