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Diffstat (limited to 'fs/btrfs/super.c')
-rw-r--r--fs/btrfs/super.c169
1 files changed, 137 insertions, 32 deletions
diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
index 24154e422945..00b8f37cc306 100644
--- a/fs/btrfs/super.c
+++ b/fs/btrfs/super.c
@@ -295,21 +295,23 @@ enum {
Opt_nossd, Opt_ssd_spread, Opt_thread_pool, Opt_noacl, Opt_compress,
Opt_compress_type, Opt_compress_force, Opt_compress_force_type,
Opt_notreelog, Opt_ratio, Opt_flushoncommit, Opt_discard,
- Opt_space_cache, Opt_clear_cache, Opt_user_subvol_rm_allowed,
- Opt_enospc_debug, Opt_subvolrootid, Opt_defrag, Opt_inode_cache,
- Opt_no_space_cache, Opt_recovery, Opt_skip_balance,
- Opt_check_integrity, Opt_check_integrity_including_extent_data,
+ Opt_space_cache, Opt_space_cache_version, Opt_clear_cache,
+ Opt_user_subvol_rm_allowed, Opt_enospc_debug, Opt_subvolrootid,
+ Opt_defrag, Opt_inode_cache, Opt_no_space_cache, Opt_recovery,
+ Opt_skip_balance, Opt_check_integrity,
+ Opt_check_integrity_including_extent_data,
Opt_check_integrity_print_mask, Opt_fatal_errors, Opt_rescan_uuid_tree,
Opt_commit_interval, Opt_barrier, Opt_nodefrag, Opt_nodiscard,
Opt_noenospc_debug, Opt_noflushoncommit, Opt_acl, Opt_datacow,
- Opt_datasum, Opt_treelog, Opt_noinode_cache,
+ Opt_datasum, Opt_treelog, Opt_noinode_cache, Opt_usebackuproot,
+ Opt_nologreplay, Opt_norecovery,
#ifdef CONFIG_BTRFS_DEBUG
Opt_fragment_data, Opt_fragment_metadata, Opt_fragment_all,
#endif
Opt_err,
};
-static match_table_t tokens = {
+static const match_table_t tokens = {
{Opt_degraded, "degraded"},
{Opt_subvol, "subvol=%s"},
{Opt_subvolid, "subvolid=%s"},
@@ -334,12 +336,15 @@ static match_table_t tokens = {
{Opt_noacl, "noacl"},
{Opt_notreelog, "notreelog"},
{Opt_treelog, "treelog"},
+ {Opt_nologreplay, "nologreplay"},
+ {Opt_norecovery, "norecovery"},
{Opt_flushoncommit, "flushoncommit"},
{Opt_noflushoncommit, "noflushoncommit"},
{Opt_ratio, "metadata_ratio=%d"},
{Opt_discard, "discard"},
{Opt_nodiscard, "nodiscard"},
{Opt_space_cache, "space_cache"},
+ {Opt_space_cache_version, "space_cache=%s"},
{Opt_clear_cache, "clear_cache"},
{Opt_user_subvol_rm_allowed, "user_subvol_rm_allowed"},
{Opt_enospc_debug, "enospc_debug"},
@@ -350,7 +355,8 @@ static match_table_t tokens = {
{Opt_inode_cache, "inode_cache"},
{Opt_noinode_cache, "noinode_cache"},
{Opt_no_space_cache, "nospace_cache"},
- {Opt_recovery, "recovery"},
+ {Opt_recovery, "recovery"}, /* deprecated */
+ {Opt_usebackuproot, "usebackuproot"},
{Opt_skip_balance, "skip_balance"},
{Opt_check_integrity, "check_int"},
{Opt_check_integrity_including_extent_data, "check_int_data"},
@@ -371,7 +377,8 @@ static match_table_t tokens = {
* reading in a new superblock is parsed here.
* XXX JDM: This needs to be cleaned up for remount.
*/
-int btrfs_parse_options(struct btrfs_root *root, char *options)
+int btrfs_parse_options(struct btrfs_root *root, char *options,
+ unsigned long new_flags)
{
struct btrfs_fs_info *info = root->fs_info;
substring_t args[MAX_OPT_ARGS];
@@ -381,13 +388,22 @@ int btrfs_parse_options(struct btrfs_root *root, char *options)
int ret = 0;
char *compress_type;
bool compress_force = false;
+ enum btrfs_compression_type saved_compress_type;
+ bool saved_compress_force;
+ int no_compress = 0;
cache_gen = btrfs_super_cache_generation(root->fs_info->super_copy);
- if (cache_gen)
+ if (btrfs_fs_compat_ro(root->fs_info, FREE_SPACE_TREE))
+ btrfs_set_opt(info->mount_opt, FREE_SPACE_TREE);
+ else if (cache_gen)
btrfs_set_opt(info->mount_opt, SPACE_CACHE);
+ /*
+ * Even the options are empty, we still need to do extra check
+ * against new flags
+ */
if (!options)
- goto out;
+ goto check;
/*
* strsep changes the string, duplicate it because parse_options
@@ -458,6 +474,10 @@ int btrfs_parse_options(struct btrfs_root *root, char *options)
/* Fallthrough */
case Opt_compress:
case Opt_compress_type:
+ saved_compress_type = btrfs_test_opt(root, COMPRESS) ?
+ info->compress_type : BTRFS_COMPRESS_NONE;
+ saved_compress_force =
+ btrfs_test_opt(root, FORCE_COMPRESS);
if (token == Opt_compress ||
token == Opt_compress_force ||
strcmp(args[0].from, "zlib") == 0) {
@@ -466,6 +486,7 @@ int btrfs_parse_options(struct btrfs_root *root, char *options)
btrfs_set_opt(info->mount_opt, COMPRESS);
btrfs_clear_opt(info->mount_opt, NODATACOW);
btrfs_clear_opt(info->mount_opt, NODATASUM);
+ no_compress = 0;
} else if (strcmp(args[0].from, "lzo") == 0) {
compress_type = "lzo";
info->compress_type = BTRFS_COMPRESS_LZO;
@@ -473,25 +494,21 @@ int btrfs_parse_options(struct btrfs_root *root, char *options)
btrfs_clear_opt(info->mount_opt, NODATACOW);
btrfs_clear_opt(info->mount_opt, NODATASUM);
btrfs_set_fs_incompat(info, COMPRESS_LZO);
+ no_compress = 0;
} else if (strncmp(args[0].from, "no", 2) == 0) {
compress_type = "no";
btrfs_clear_opt(info->mount_opt, COMPRESS);
btrfs_clear_opt(info->mount_opt, FORCE_COMPRESS);
compress_force = false;
+ no_compress++;
} else {
ret = -EINVAL;
goto out;
}
if (compress_force) {
- btrfs_set_and_info(root, FORCE_COMPRESS,
- "force %s compression",
- compress_type);
+ btrfs_set_opt(info->mount_opt, FORCE_COMPRESS);
} else {
- if (!btrfs_test_opt(root, COMPRESS))
- btrfs_info(root->fs_info,
- "btrfs: use %s compression",
- compress_type);
/*
* If we remount from compress-force=xxx to
* compress=xxx, we need clear FORCE_COMPRESS
@@ -500,6 +517,17 @@ int btrfs_parse_options(struct btrfs_root *root, char *options)
*/
btrfs_clear_opt(info->mount_opt, FORCE_COMPRESS);
}
+ if ((btrfs_test_opt(root, COMPRESS) &&
+ (info->compress_type != saved_compress_type ||
+ compress_force != saved_compress_force)) ||
+ (!btrfs_test_opt(root, COMPRESS) &&
+ no_compress == 1)) {
+ btrfs_info(root->fs_info,
+ "%s %s compression",
+ (compress_force) ? "force" : "use",
+ compress_type);
+ }
+ compress_force = false;
break;
case Opt_ssd:
btrfs_set_and_info(root, SSD,
@@ -587,6 +615,11 @@ int btrfs_parse_options(struct btrfs_root *root, char *options)
btrfs_clear_and_info(root, NOTREELOG,
"enabling tree log");
break;
+ case Opt_norecovery:
+ case Opt_nologreplay:
+ btrfs_set_and_info(root, NOLOGREPLAY,
+ "disabling log replay at mount time");
+ break;
case Opt_flushoncommit:
btrfs_set_and_info(root, FLUSHONCOMMIT,
"turning on flush-on-commit");
@@ -617,15 +650,35 @@ int btrfs_parse_options(struct btrfs_root *root, char *options)
"turning off discard");
break;
case Opt_space_cache:
- btrfs_set_and_info(root, SPACE_CACHE,
- "enabling disk space caching");
+ case Opt_space_cache_version:
+ if (token == Opt_space_cache ||
+ strcmp(args[0].from, "v1") == 0) {
+ btrfs_clear_opt(root->fs_info->mount_opt,
+ FREE_SPACE_TREE);
+ btrfs_set_and_info(root, SPACE_CACHE,
+ "enabling disk space caching");
+ } else if (strcmp(args[0].from, "v2") == 0) {
+ btrfs_clear_opt(root->fs_info->mount_opt,
+ SPACE_CACHE);
+ btrfs_set_and_info(root, FREE_SPACE_TREE,
+ "enabling free space tree");
+ } else {
+ ret = -EINVAL;
+ goto out;
+ }
break;
case Opt_rescan_uuid_tree:
btrfs_set_opt(info->mount_opt, RESCAN_UUID_TREE);
break;
case Opt_no_space_cache:
- btrfs_clear_and_info(root, SPACE_CACHE,
- "disabling disk space caching");
+ if (btrfs_test_opt(root, SPACE_CACHE)) {
+ btrfs_clear_and_info(root, SPACE_CACHE,
+ "disabling disk space caching");
+ }
+ if (btrfs_test_opt(root, FREE_SPACE_TREE)) {
+ btrfs_clear_and_info(root, FREE_SPACE_TREE,
+ "disabling free space tree");
+ }
break;
case Opt_inode_cache:
btrfs_set_pending_and_info(info, INODE_MAP_CACHE,
@@ -657,8 +710,12 @@ int btrfs_parse_options(struct btrfs_root *root, char *options)
"disabling auto defrag");
break;
case Opt_recovery:
- btrfs_info(root->fs_info, "enabling auto recovery");
- btrfs_set_opt(info->mount_opt, RECOVERY);
+ btrfs_warn(root->fs_info,
+ "'recovery' is deprecated, use 'usebackuproot' instead");
+ case Opt_usebackuproot:
+ btrfs_info(root->fs_info,
+ "trying to use backup root at mount time");
+ btrfs_set_opt(info->mount_opt, USEBACKUPROOT);
break;
case Opt_skip_balance:
btrfs_set_opt(info->mount_opt, SKIP_BALANCE);
@@ -753,9 +810,27 @@ int btrfs_parse_options(struct btrfs_root *root, char *options)
break;
}
}
+check:
+ /*
+ * Extra check for current option against current flag
+ */
+ if (btrfs_test_opt(root, NOLOGREPLAY) && !(new_flags & MS_RDONLY)) {
+ btrfs_err(root->fs_info,
+ "nologreplay must be used with ro mount option");
+ ret = -EINVAL;
+ }
out:
+ if (btrfs_fs_compat_ro(root->fs_info, FREE_SPACE_TREE) &&
+ !btrfs_test_opt(root, FREE_SPACE_TREE) &&
+ !btrfs_test_opt(root, CLEAR_CACHE)) {
+ btrfs_err(root->fs_info, "cannot disable free space tree");
+ ret = -EINVAL;
+
+ }
if (!ret && btrfs_test_opt(root, SPACE_CACHE))
btrfs_info(root->fs_info, "disk space caching is enabled");
+ if (!ret && btrfs_test_opt(root, FREE_SPACE_TREE))
+ btrfs_info(root->fs_info, "using free space tree");
kfree(orig);
return ret;
}
@@ -1154,6 +1229,8 @@ static int btrfs_show_options(struct seq_file *seq, struct dentry *dentry)
seq_puts(seq, ",ssd");
if (btrfs_test_opt(root, NOTREELOG))
seq_puts(seq, ",notreelog");
+ if (btrfs_test_opt(root, NOLOGREPLAY))
+ seq_puts(seq, ",nologreplay");
if (btrfs_test_opt(root, FLUSHONCOMMIT))
seq_puts(seq, ",flushoncommit");
if (btrfs_test_opt(root, DISCARD))
@@ -1162,6 +1239,8 @@ static int btrfs_show_options(struct seq_file *seq, struct dentry *dentry)
seq_puts(seq, ",noacl");
if (btrfs_test_opt(root, SPACE_CACHE))
seq_puts(seq, ",space_cache");
+ else if (btrfs_test_opt(root, FREE_SPACE_TREE))
+ seq_puts(seq, ",space_cache=v2");
else
seq_puts(seq, ",nospace_cache");
if (btrfs_test_opt(root, RESCAN_UUID_TREE))
@@ -1178,8 +1257,6 @@ static int btrfs_show_options(struct seq_file *seq, struct dentry *dentry)
seq_puts(seq, ",inode_cache");
if (btrfs_test_opt(root, SKIP_BALANCE))
seq_puts(seq, ",skip_balance");
- if (btrfs_test_opt(root, RECOVERY))
- seq_puts(seq, ",recovery");
#ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY
if (btrfs_test_opt(root, CHECK_INTEGRITY_INCLUDING_EXTENT_DATA))
seq_puts(seq, ",check_int_data");
@@ -1514,9 +1591,7 @@ static struct dentry *btrfs_mount(struct file_system_type *fs_type, int flags,
if ((flags ^ s->s_flags) & MS_RDONLY)
error = -EBUSY;
} else {
- char b[BDEVNAME_SIZE];
-
- strlcpy(s->s_id, bdevname(bdev, b), sizeof(s->s_id));
+ snprintf(s->s_id, sizeof(s->s_id), "%pg", bdev);
btrfs_sb(s)->bdev_holder = fs_type;
error = btrfs_fill_super(s, fs_devices, data,
flags & MS_SILENT ? 1 : 0);
@@ -1637,7 +1712,7 @@ static int btrfs_remount(struct super_block *sb, int *flags, char *data)
}
}
- ret = btrfs_parse_options(root, data);
+ ret = btrfs_parse_options(root, data, *flags);
if (ret) {
ret = -EINVAL;
goto restore;
@@ -1865,7 +1940,7 @@ static int btrfs_calc_avail_data_space(struct btrfs_root *root, u64 *free_bytes)
* btrfs starts at an offset of at least 1MB when doing chunk
* allocation.
*/
- skip_space = 1024 * 1024;
+ skip_space = SZ_1M;
/* user can set the offset in fs_info->alloc_start. */
if (fs_info->alloc_start &&
@@ -1956,6 +2031,8 @@ static int btrfs_calc_avail_data_space(struct btrfs_root *root, u64 *free_bytes)
* there are other factors that may change the result (like a new metadata
* chunk).
*
+ * If metadata is exhausted, f_bavail will be 0.
+ *
* FIXME: not accurate for mixed block groups, total and free/used are ok,
* available appears slightly larger.
*/
@@ -1967,11 +2044,13 @@ static int btrfs_statfs(struct dentry *dentry, struct kstatfs *buf)
struct btrfs_space_info *found;
u64 total_used = 0;
u64 total_free_data = 0;
+ u64 total_free_meta = 0;
int bits = dentry->d_sb->s_blocksize_bits;
__be32 *fsid = (__be32 *)fs_info->fsid;
unsigned factor = 1;
struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv;
int ret;
+ u64 thresh = 0;
/*
* holding chunk_muext to avoid allocating new chunks, holding
@@ -1997,6 +2076,8 @@ static int btrfs_statfs(struct dentry *dentry, struct kstatfs *buf)
}
}
}
+ if (found->flags & BTRFS_BLOCK_GROUP_METADATA)
+ total_free_meta += found->disk_total - found->disk_used;
total_used += found->disk_used;
}
@@ -2019,6 +2100,24 @@ static int btrfs_statfs(struct dentry *dentry, struct kstatfs *buf)
buf->f_bavail += div_u64(total_free_data, factor);
buf->f_bavail = buf->f_bavail >> bits;
+ /*
+ * We calculate the remaining metadata space minus global reserve. If
+ * this is (supposedly) smaller than zero, there's no space. But this
+ * does not hold in practice, the exhausted state happens where's still
+ * some positive delta. So we apply some guesswork and compare the
+ * delta to a 4M threshold. (Practically observed delta was ~2M.)
+ *
+ * We probably cannot calculate the exact threshold value because this
+ * depends on the internal reservations requested by various
+ * operations, so some operations that consume a few metadata will
+ * succeed even if the Avail is zero. But this is better than the other
+ * way around.
+ */
+ thresh = 4 * 1024 * 1024;
+
+ if (total_free_meta - thresh < block_rsv->size)
+ buf->f_bavail = 0;
+
buf->f_type = BTRFS_SUPER_MAGIC;
buf->f_bsize = dentry->d_sb->s_blocksize;
buf->f_namelen = BTRFS_NAME_LEN;
@@ -2091,6 +2190,9 @@ static long btrfs_control_ioctl(struct file *file, unsigned int cmd,
break;
ret = !(fs_devices->num_devices == fs_devices->total_devices);
break;
+ case BTRFS_IOC_GET_SUPPORTED_FEATURES:
+ ret = btrfs_ioctl_get_supported_features((void __user*)arg);
+ break;
}
kfree(vol);
@@ -2189,7 +2291,7 @@ static void btrfs_interface_exit(void)
misc_deregister(&btrfs_misc);
}
-static void btrfs_print_info(void)
+static void btrfs_print_mod_info(void)
{
printk(KERN_INFO "Btrfs loaded"
#ifdef CONFIG_BTRFS_DEBUG
@@ -2225,6 +2327,9 @@ static int btrfs_run_sanity_tests(void)
if (ret)
goto out;
ret = btrfs_test_qgroups();
+ if (ret)
+ goto out;
+ ret = btrfs_test_free_space_tree();
out:
btrfs_destroy_test_fs();
return ret;
@@ -2288,7 +2393,7 @@ static int __init init_btrfs_fs(void)
btrfs_init_lockdep();
- btrfs_print_info();
+ btrfs_print_mod_info();
err = btrfs_run_sanity_tests();
if (err)
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