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SUSE:SLE-12-SP1:Update
util-linux.2662
util-linux-libmount-btrfs-subvolid-3.patch
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File util-linux-libmount-btrfs-subvolid-3.patch of Package util-linux.2662
From 9aa3173bab816dfa88972dc12d4b54b9dfce7177 Mon Sep 17 00:00:00 2001 From: Karel Zak <kzak@redhat.com> Date: Mon, 1 Feb 2016 13:10:33 +0100 Subject: [PATCH] libmount: move btrfs subvol code refactoring Signed-off-by: Karel Zak <kzak@redhat.com> --- libmount/src/tab.c | 214 ++++++++++++++++++++++++++++------------------------- 1 file changed, 115 insertions(+), 99 deletions(-) Index: util-linux-2.25/libmount/src/tab.c =================================================================== --- util-linux-2.25.orig/libmount/src/tab.c +++ util-linux-2.25/libmount/src/tab.c @@ -1278,6 +1278,120 @@ static char *remove_mountpoint_from_path return res; } +#ifdef HAVE_BTRFS_SUPPORT +static int get_btrfs_fs_root(struct libmnt_table *tb, struct libmnt_fs *fs, char **root) +{ + char *vol = NULL, *p; + size_t sz, volsz = 0; + + DBG(BTRFS, ul_debug("lookup for btrfs FS root")); + *root = NULL; + + if (mnt_fs_get_option(fs, "subvolid", &vol, &volsz) == 0) { + char *target; + struct libmnt_fs *f; + char subvolidstr[sizeof(stringify_value(UINT64_MAX))]; + + DBG(BTRFS, ul_debug(" found subvolid=%s, checking", vol)); + + assert (volsz + 1 < sizeof(stringify_value(UINT64_MAX))); + memcpy(subvolidstr, vol, volsz); + subvolidstr[volsz] = '\0'; + + target = mnt_resolve_target(mnt_fs_get_target(fs), tb->cache); + if (!target) + goto err; + + DBG(BTRFS, ul_debug(" tring target=%s subvolid=%s", target, subvolidstr)); + f = mnt_table_find_target_with_option(tb, target, + "subvolid", subvolidstr, + MNT_ITER_BACKWARD); + if (!tb->cache) + free(target); + if (!f) + goto not_found; + + /* Instead of set of BACKREF queries constructing subvol path + * corresponding to a particular subvolid, use the one in + * mountinfo. Kernel keeps subvol path up to date. + */ + if (mnt_fs_get_option(f, "subvol", &vol, &volsz) != 0) + goto not_found; + + } else if (mnt_fs_get_option(fs, "subvol", &vol, &volsz) != 0) { + /* If fstab entry does not contain "subvol", we have to + * check, whether btrfs has default subvolume defined. + */ + uint64_t default_id; + char *target; + struct libmnt_fs *f; + char default_id_str[sizeof(stringify_value(UINT64_MAX))]; + + DBG(BTRFS, ul_debug(" subvolid/subvol not found, checking default")); + + default_id = btrfs_get_default_subvol_id(mnt_fs_get_target(fs)); + if (default_id == UINT64_MAX) + goto not_found; + + /* Volume has default subvolume. Check if it matches to + * the one in mountinfo. + * + * Only kernel >= 4.2 reports subvolid. On older + * kernels, there is no reasonable way to detect which + * subvolume was mounted. + */ + target = mnt_resolve_target(mnt_fs_get_target(fs), tb->cache); + if (!target) + goto err; + + snprintf(default_id_str, sizeof(default_id_str), "%llu", + (unsigned long long int) default_id); + + DBG(BTRFS, ul_debug(" tring target=%s default subvolid=%s", + target, default_id_str)); + + f = mnt_table_find_target_with_option(tb, target, + "subvolid", default_id_str, + MNT_ITER_BACKWARD); + if (!tb->cache) + free(target); + if (!f) + goto not_found; + + /* Instead of set of BACKREF queries constructing + * subvol path, use the one in mountinfo. Kernel does + * the evaluation for us. + */ + DBG(BTRFS, ul_debug("setting FS root: btrfs default subvolid = %s", + default_id_str)); + + if (mnt_fs_get_option(f, "subvol", &vol, &volsz) != 0) + goto not_found; + } + + DBG(BTRFS, ul_debug(" using subvol=%s", vol)); + sz = volsz; + if (*vol != '/') + sz++; + *root = malloc(sz + 1); + if (!*root) + goto err; + p = *root; + if (*vol != '/') + *p++ = '/'; + memcpy(p, vol, volsz); + *(*root + sz) = '\0'; + return 0; + +not_found: + DBG(BTRFS, ul_debug(" not found btrfs volume setting")); + return 1; +err: + DBG(BTRFS, ul_debug(" error on btrfs volume setting evaluation")); + return errno ? -errno : -1; +} +#endif /* HAVE_BTRFS_SUPPORT */ + /* * tb: /proc/self/mountinfo * fs: filesystem @@ -1374,106 +1488,8 @@ struct libmnt_fs *mnt_table_get_fs_root( * btrfs-subvolume mount -- get subvolume name and use it as a root-fs path */ else if (fstype && (!strcmp(fstype, "btrfs") || !strcmp(fstype, "auto"))) { - char *vol = NULL, *p; - size_t sz, volsz = 0; - - DBG(BTRFS, ul_debug("lookup for btrfs FS root")); - - if (mnt_fs_get_option(fs, "subvolid", &vol, &volsz) != 0) { - if (mnt_fs_get_option(fs, "subvol", &vol, &volsz) != 0) { - /* If fstab entry does not contain "subvol", we - * have to check, whether btrfs has default - * subvolume defined. - */ - uint64_t default_id; - char *target; - struct libmnt_fs *f; - char default_id_str[sizeof(stringify_value(UINT64_MAX))]; - - DBG(BTRFS, ul_debug(" subvolid/subvol not set, checking default")); - - default_id = btrfs_get_default_subvol_id(mnt_fs_get_target(fs)); - if (default_id == UINT64_MAX) - goto dflt; - - /* Volume has default subvolume. Check if it - * matches to the one in mountinfo. - * - * Only kernel >= 4.2 reports subvolid. On older - * kernels, there is no reasonable way to detect - * which subvolume was mounted. - */ - target = mnt_resolve_target(mnt_fs_get_target(fs), tb->cache); - if (!target) - goto err; - - snprintf(default_id_str, sizeof(default_id_str), "%llu", - (unsigned long long int) default_id); - - DBG(BTRFS, ul_debug(" tring target=%s default subvolid=%s", target, default_id_str)); - f = mnt_table_find_target_with_option(tb, target, - "subvolid", default_id_str, - MNT_ITER_BACKWARD); - if (!tb->cache) - free(target); - if (!f) - goto dflt; - - /* Instead of set of BACKREF queries constructing - * subvol path, use the one in mountinfo. Kernel - * does the evaluation for us. */ - DBG(BTRFS, ul_debug("setting FS root: btrfs default subvolid = %s", default_id_str)); - if (mnt_fs_get_option(f, "subvol", &vol, &volsz)) - goto dflt; - } else - DBG(BTRFS, ul_debug(" found subvol=%s", vol)); - } else { - char *target; - struct libmnt_fs *f; - char subvolidstr[sizeof(stringify_value(UINT64_MAX))]; - - DBG(BTRFS, ul_debug(" found subvolid=%s, checking", vol)); - - assert (volsz + 1 < sizeof(stringify_value(UINT64_MAX))); - memcpy(subvolidstr, vol, volsz); - subvolidstr[volsz] = '\0'; - - target = mnt_resolve_target(mnt_fs_get_target(fs), tb->cache); - if (!target) - goto err; - - DBG(BTRFS, ul_debug(" tring target=%s subvolid=%s", target, subvolidstr)); - f = mnt_table_find_target_with_option(tb, target, - "subvolid", subvolidstr, - MNT_ITER_BACKWARD); - if (!tb->cache) - free(target); - - if (!f) - goto dflt; - - /* Instead of set of BACKREF queries constructing - * subvol path corresponding to a particular subvolid, - * use the one in mountinfo. Kernel keeps subvol path - * up to date. - */ - if (mnt_fs_get_option(f, "subvol", &vol, &volsz)) - goto dflt; - - DBG(BTRFS, ul_debug(" found subvol=%s", vol)); - } - - sz = volsz; - if (*vol != '/') - sz++; - root = malloc(sz + 1); - if (!root) + if (get_btrfs_fs_root(tb, fs, &root) < 0) goto err; - p = root; - if (*vol != '/') - *p++ = '/'; - memcpy(p, vol, volsz); - *(root + sz) = '\0'; } #endif /* HAVE_BTRFS_SUPPORT */
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