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2702 lines
73 KiB
2702 lines
73 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* Copyright (C) 2007 Oracle. All rights reserved. |
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*/ |
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|
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#include <linux/blkdev.h> |
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#include <linux/module.h> |
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#include <linux/fs.h> |
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#include <linux/pagemap.h> |
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#include <linux/highmem.h> |
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#include <linux/time.h> |
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#include <linux/init.h> |
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#include <linux/seq_file.h> |
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#include <linux/string.h> |
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#include <linux/backing-dev.h> |
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#include <linux/mount.h> |
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#include <linux/writeback.h> |
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#include <linux/statfs.h> |
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#include <linux/compat.h> |
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#include <linux/parser.h> |
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#include <linux/ctype.h> |
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#include <linux/namei.h> |
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#include <linux/miscdevice.h> |
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#include <linux/magic.h> |
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#include <linux/slab.h> |
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#include <linux/cleancache.h> |
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#include <linux/ratelimit.h> |
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#include <linux/crc32c.h> |
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#include <linux/btrfs.h> |
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#include "delayed-inode.h" |
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#include "ctree.h" |
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#include "disk-io.h" |
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#include "transaction.h" |
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#include "btrfs_inode.h" |
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#include "print-tree.h" |
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#include "props.h" |
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#include "xattr.h" |
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#include "volumes.h" |
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#include "export.h" |
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#include "compression.h" |
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#include "rcu-string.h" |
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#include "dev-replace.h" |
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#include "free-space-cache.h" |
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#include "backref.h" |
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#include "space-info.h" |
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#include "sysfs.h" |
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#include "zoned.h" |
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#include "tests/btrfs-tests.h" |
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#include "block-group.h" |
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#include "discard.h" |
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#include "qgroup.h" |
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#define CREATE_TRACE_POINTS |
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#include <trace/events/btrfs.h> |
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|
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static const struct super_operations btrfs_super_ops; |
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|
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/* |
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* Types for mounting the default subvolume and a subvolume explicitly |
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* requested by subvol=/path. That way the callchain is straightforward and we |
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* don't have to play tricks with the mount options and recursive calls to |
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* btrfs_mount. |
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* |
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* The new btrfs_root_fs_type also servers as a tag for the bdev_holder. |
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*/ |
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static struct file_system_type btrfs_fs_type; |
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static struct file_system_type btrfs_root_fs_type; |
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|
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static int btrfs_remount(struct super_block *sb, int *flags, char *data); |
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|
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/* |
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* Generally the error codes correspond to their respective errors, but there |
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* are a few special cases. |
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* |
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* EUCLEAN: Any sort of corruption that we encounter. The tree-checker for |
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* instance will return EUCLEAN if any of the blocks are corrupted in |
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* a way that is problematic. We want to reserve EUCLEAN for these |
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* sort of corruptions. |
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* |
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* EROFS: If we check BTRFS_FS_STATE_ERROR and fail out with a return error, we |
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* need to use EROFS for this case. We will have no idea of the |
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* original failure, that will have been reported at the time we tripped |
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* over the error. Each subsequent error that doesn't have any context |
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* of the original error should use EROFS when handling BTRFS_FS_STATE_ERROR. |
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*/ |
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const char * __attribute_const__ btrfs_decode_error(int errno) |
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{ |
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char *errstr = "unknown"; |
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|
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switch (errno) { |
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case -ENOENT: /* -2 */ |
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errstr = "No such entry"; |
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break; |
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case -EIO: /* -5 */ |
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errstr = "IO failure"; |
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break; |
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case -ENOMEM: /* -12*/ |
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errstr = "Out of memory"; |
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break; |
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case -EEXIST: /* -17 */ |
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errstr = "Object already exists"; |
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break; |
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case -ENOSPC: /* -28 */ |
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errstr = "No space left"; |
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break; |
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case -EROFS: /* -30 */ |
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errstr = "Readonly filesystem"; |
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break; |
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case -EOPNOTSUPP: /* -95 */ |
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errstr = "Operation not supported"; |
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break; |
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case -EUCLEAN: /* -117 */ |
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errstr = "Filesystem corrupted"; |
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break; |
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case -EDQUOT: /* -122 */ |
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errstr = "Quota exceeded"; |
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break; |
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} |
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|
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return errstr; |
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} |
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|
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/* |
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* __btrfs_handle_fs_error decodes expected errors from the caller and |
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* invokes the appropriate error response. |
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*/ |
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__cold |
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void __btrfs_handle_fs_error(struct btrfs_fs_info *fs_info, const char *function, |
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unsigned int line, int errno, const char *fmt, ...) |
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{ |
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struct super_block *sb = fs_info->sb; |
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#ifdef CONFIG_PRINTK |
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const char *errstr; |
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#endif |
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|
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/* |
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* Special case: if the error is EROFS, and we're already |
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* under SB_RDONLY, then it is safe here. |
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*/ |
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if (errno == -EROFS && sb_rdonly(sb)) |
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return; |
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#ifdef CONFIG_PRINTK |
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errstr = btrfs_decode_error(errno); |
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if (fmt) { |
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struct va_format vaf; |
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va_list args; |
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|
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va_start(args, fmt); |
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vaf.fmt = fmt; |
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vaf.va = &args; |
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pr_crit("BTRFS: error (device %s) in %s:%d: errno=%d %s (%pV)\n", |
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sb->s_id, function, line, errno, errstr, &vaf); |
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va_end(args); |
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} else { |
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pr_crit("BTRFS: error (device %s) in %s:%d: errno=%d %s\n", |
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sb->s_id, function, line, errno, errstr); |
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} |
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#endif |
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|
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/* |
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* Today we only save the error info to memory. Long term we'll |
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* also send it down to the disk |
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*/ |
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set_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state); |
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|
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/* Don't go through full error handling during mount */ |
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if (!(sb->s_flags & SB_BORN)) |
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return; |
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|
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if (sb_rdonly(sb)) |
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return; |
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btrfs_discard_stop(fs_info); |
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|
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/* btrfs handle error by forcing the filesystem readonly */ |
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btrfs_set_sb_rdonly(sb); |
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btrfs_info(fs_info, "forced readonly"); |
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/* |
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* Note that a running device replace operation is not canceled here |
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* although there is no way to update the progress. It would add the |
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* risk of a deadlock, therefore the canceling is omitted. The only |
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* penalty is that some I/O remains active until the procedure |
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* completes. The next time when the filesystem is mounted writable |
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* again, the device replace operation continues. |
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*/ |
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} |
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|
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#ifdef CONFIG_PRINTK |
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static const char * const logtypes[] = { |
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"emergency", |
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"alert", |
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"critical", |
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"error", |
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"warning", |
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"notice", |
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"info", |
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"debug", |
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}; |
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/* |
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* Use one ratelimit state per log level so that a flood of less important |
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* messages doesn't cause more important ones to be dropped. |
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*/ |
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static struct ratelimit_state printk_limits[] = { |
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RATELIMIT_STATE_INIT(printk_limits[0], DEFAULT_RATELIMIT_INTERVAL, 100), |
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RATELIMIT_STATE_INIT(printk_limits[1], DEFAULT_RATELIMIT_INTERVAL, 100), |
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RATELIMIT_STATE_INIT(printk_limits[2], DEFAULT_RATELIMIT_INTERVAL, 100), |
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RATELIMIT_STATE_INIT(printk_limits[3], DEFAULT_RATELIMIT_INTERVAL, 100), |
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RATELIMIT_STATE_INIT(printk_limits[4], DEFAULT_RATELIMIT_INTERVAL, 100), |
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RATELIMIT_STATE_INIT(printk_limits[5], DEFAULT_RATELIMIT_INTERVAL, 100), |
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RATELIMIT_STATE_INIT(printk_limits[6], DEFAULT_RATELIMIT_INTERVAL, 100), |
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RATELIMIT_STATE_INIT(printk_limits[7], DEFAULT_RATELIMIT_INTERVAL, 100), |
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}; |
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void __cold btrfs_printk(const struct btrfs_fs_info *fs_info, const char *fmt, ...) |
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{ |
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char lvl[PRINTK_MAX_SINGLE_HEADER_LEN + 1] = "\0"; |
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struct va_format vaf; |
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va_list args; |
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int kern_level; |
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const char *type = logtypes[4]; |
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struct ratelimit_state *ratelimit = &printk_limits[4]; |
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va_start(args, fmt); |
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while ((kern_level = printk_get_level(fmt)) != 0) { |
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size_t size = printk_skip_level(fmt) - fmt; |
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if (kern_level >= '0' && kern_level <= '7') { |
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memcpy(lvl, fmt, size); |
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lvl[size] = '\0'; |
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type = logtypes[kern_level - '0']; |
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ratelimit = &printk_limits[kern_level - '0']; |
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} |
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fmt += size; |
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} |
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vaf.fmt = fmt; |
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vaf.va = &args; |
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|
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if (__ratelimit(ratelimit)) { |
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if (fs_info) |
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printk("%sBTRFS %s (device %s): %pV\n", lvl, type, |
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fs_info->sb->s_id, &vaf); |
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else |
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printk("%sBTRFS %s: %pV\n", lvl, type, &vaf); |
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} |
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va_end(args); |
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} |
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#endif |
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#if BITS_PER_LONG == 32 |
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void __cold btrfs_warn_32bit_limit(struct btrfs_fs_info *fs_info) |
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{ |
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if (!test_and_set_bit(BTRFS_FS_32BIT_WARN, &fs_info->flags)) { |
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btrfs_warn(fs_info, "reaching 32bit limit for logical addresses"); |
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btrfs_warn(fs_info, |
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"due to page cache limit on 32bit systems, btrfs can't access metadata at or beyond %lluT", |
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BTRFS_32BIT_MAX_FILE_SIZE >> 40); |
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btrfs_warn(fs_info, |
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"please consider upgrading to 64bit kernel/hardware"); |
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} |
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} |
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|
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void __cold btrfs_err_32bit_limit(struct btrfs_fs_info *fs_info) |
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{ |
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if (!test_and_set_bit(BTRFS_FS_32BIT_ERROR, &fs_info->flags)) { |
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btrfs_err(fs_info, "reached 32bit limit for logical addresses"); |
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btrfs_err(fs_info, |
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"due to page cache limit on 32bit systems, metadata beyond %lluT can't be accessed", |
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BTRFS_32BIT_MAX_FILE_SIZE >> 40); |
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btrfs_err(fs_info, |
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"please consider upgrading to 64bit kernel/hardware"); |
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} |
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} |
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#endif |
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|
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/* |
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* We only mark the transaction aborted and then set the file system read-only. |
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* This will prevent new transactions from starting or trying to join this |
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* one. |
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* |
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* This means that error recovery at the call site is limited to freeing |
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* any local memory allocations and passing the error code up without |
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* further cleanup. The transaction should complete as it normally would |
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* in the call path but will return -EIO. |
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* |
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* We'll complete the cleanup in btrfs_end_transaction and |
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* btrfs_commit_transaction. |
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*/ |
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__cold |
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void __btrfs_abort_transaction(struct btrfs_trans_handle *trans, |
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const char *function, |
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unsigned int line, int errno) |
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{ |
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struct btrfs_fs_info *fs_info = trans->fs_info; |
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|
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WRITE_ONCE(trans->aborted, errno); |
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WRITE_ONCE(trans->transaction->aborted, errno); |
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/* Wake up anybody who may be waiting on this transaction */ |
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wake_up(&fs_info->transaction_wait); |
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wake_up(&fs_info->transaction_blocked_wait); |
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__btrfs_handle_fs_error(fs_info, function, line, errno, NULL); |
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} |
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/* |
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* __btrfs_panic decodes unexpected, fatal errors from the caller, |
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* issues an alert, and either panics or BUGs, depending on mount options. |
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*/ |
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__cold |
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void __btrfs_panic(struct btrfs_fs_info *fs_info, const char *function, |
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unsigned int line, int errno, const char *fmt, ...) |
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{ |
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char *s_id = "<unknown>"; |
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const char *errstr; |
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struct va_format vaf = { .fmt = fmt }; |
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va_list args; |
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|
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if (fs_info) |
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s_id = fs_info->sb->s_id; |
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|
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va_start(args, fmt); |
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vaf.va = &args; |
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|
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errstr = btrfs_decode_error(errno); |
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if (fs_info && (btrfs_test_opt(fs_info, PANIC_ON_FATAL_ERROR))) |
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panic(KERN_CRIT "BTRFS panic (device %s) in %s:%d: %pV (errno=%d %s)\n", |
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s_id, function, line, &vaf, errno, errstr); |
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|
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btrfs_crit(fs_info, "panic in %s:%d: %pV (errno=%d %s)", |
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function, line, &vaf, errno, errstr); |
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va_end(args); |
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/* Caller calls BUG() */ |
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} |
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|
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static void btrfs_put_super(struct super_block *sb) |
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{ |
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close_ctree(btrfs_sb(sb)); |
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} |
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|
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enum { |
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Opt_acl, Opt_noacl, |
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Opt_clear_cache, |
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Opt_commit_interval, |
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Opt_compress, |
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Opt_compress_force, |
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Opt_compress_force_type, |
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Opt_compress_type, |
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Opt_degraded, |
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Opt_device, |
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Opt_fatal_errors, |
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Opt_flushoncommit, Opt_noflushoncommit, |
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Opt_max_inline, |
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Opt_barrier, Opt_nobarrier, |
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Opt_datacow, Opt_nodatacow, |
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Opt_datasum, Opt_nodatasum, |
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Opt_defrag, Opt_nodefrag, |
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Opt_discard, Opt_nodiscard, |
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Opt_discard_mode, |
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Opt_norecovery, |
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Opt_ratio, |
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Opt_rescan_uuid_tree, |
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Opt_skip_balance, |
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Opt_space_cache, Opt_no_space_cache, |
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Opt_space_cache_version, |
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Opt_ssd, Opt_nossd, |
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Opt_ssd_spread, Opt_nossd_spread, |
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Opt_subvol, |
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Opt_subvol_empty, |
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Opt_subvolid, |
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Opt_thread_pool, |
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Opt_treelog, Opt_notreelog, |
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Opt_user_subvol_rm_allowed, |
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|
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/* Rescue options */ |
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Opt_rescue, |
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Opt_usebackuproot, |
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Opt_nologreplay, |
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Opt_ignorebadroots, |
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Opt_ignoredatacsums, |
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Opt_rescue_all, |
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|
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/* Deprecated options */ |
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Opt_recovery, |
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Opt_inode_cache, Opt_noinode_cache, |
|
|
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/* Debugging options */ |
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Opt_check_integrity, |
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Opt_check_integrity_including_extent_data, |
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Opt_check_integrity_print_mask, |
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Opt_enospc_debug, Opt_noenospc_debug, |
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#ifdef CONFIG_BTRFS_DEBUG |
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Opt_fragment_data, Opt_fragment_metadata, Opt_fragment_all, |
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#endif |
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#ifdef CONFIG_BTRFS_FS_REF_VERIFY |
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Opt_ref_verify, |
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#endif |
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Opt_err, |
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}; |
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|
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static const match_table_t tokens = { |
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{Opt_acl, "acl"}, |
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{Opt_noacl, "noacl"}, |
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{Opt_clear_cache, "clear_cache"}, |
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{Opt_commit_interval, "commit=%u"}, |
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{Opt_compress, "compress"}, |
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{Opt_compress_type, "compress=%s"}, |
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{Opt_compress_force, "compress-force"}, |
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{Opt_compress_force_type, "compress-force=%s"}, |
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{Opt_degraded, "degraded"}, |
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{Opt_device, "device=%s"}, |
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{Opt_fatal_errors, "fatal_errors=%s"}, |
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{Opt_flushoncommit, "flushoncommit"}, |
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{Opt_noflushoncommit, "noflushoncommit"}, |
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{Opt_inode_cache, "inode_cache"}, |
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{Opt_noinode_cache, "noinode_cache"}, |
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{Opt_max_inline, "max_inline=%s"}, |
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{Opt_barrier, "barrier"}, |
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{Opt_nobarrier, "nobarrier"}, |
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{Opt_datacow, "datacow"}, |
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{Opt_nodatacow, "nodatacow"}, |
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{Opt_datasum, "datasum"}, |
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{Opt_nodatasum, "nodatasum"}, |
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{Opt_defrag, "autodefrag"}, |
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{Opt_nodefrag, "noautodefrag"}, |
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{Opt_discard, "discard"}, |
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{Opt_discard_mode, "discard=%s"}, |
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{Opt_nodiscard, "nodiscard"}, |
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{Opt_norecovery, "norecovery"}, |
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{Opt_ratio, "metadata_ratio=%u"}, |
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{Opt_rescan_uuid_tree, "rescan_uuid_tree"}, |
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{Opt_skip_balance, "skip_balance"}, |
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{Opt_space_cache, "space_cache"}, |
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{Opt_no_space_cache, "nospace_cache"}, |
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{Opt_space_cache_version, "space_cache=%s"}, |
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{Opt_ssd, "ssd"}, |
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{Opt_nossd, "nossd"}, |
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{Opt_ssd_spread, "ssd_spread"}, |
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{Opt_nossd_spread, "nossd_spread"}, |
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{Opt_subvol, "subvol=%s"}, |
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{Opt_subvol_empty, "subvol="}, |
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{Opt_subvolid, "subvolid=%s"}, |
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{Opt_thread_pool, "thread_pool=%u"}, |
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{Opt_treelog, "treelog"}, |
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{Opt_notreelog, "notreelog"}, |
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{Opt_user_subvol_rm_allowed, "user_subvol_rm_allowed"}, |
|
|
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/* Rescue options */ |
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{Opt_rescue, "rescue=%s"}, |
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/* Deprecated, with alias rescue=nologreplay */ |
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{Opt_nologreplay, "nologreplay"}, |
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/* Deprecated, with alias rescue=usebackuproot */ |
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{Opt_usebackuproot, "usebackuproot"}, |
|
|
|
/* Deprecated options */ |
|
{Opt_recovery, "recovery"}, |
|
|
|
/* Debugging options */ |
|
{Opt_check_integrity, "check_int"}, |
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{Opt_check_integrity_including_extent_data, "check_int_data"}, |
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{Opt_check_integrity_print_mask, "check_int_print_mask=%u"}, |
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{Opt_enospc_debug, "enospc_debug"}, |
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{Opt_noenospc_debug, "noenospc_debug"}, |
|
#ifdef CONFIG_BTRFS_DEBUG |
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{Opt_fragment_data, "fragment=data"}, |
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{Opt_fragment_metadata, "fragment=metadata"}, |
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{Opt_fragment_all, "fragment=all"}, |
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#endif |
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#ifdef CONFIG_BTRFS_FS_REF_VERIFY |
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{Opt_ref_verify, "ref_verify"}, |
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#endif |
|
{Opt_err, NULL}, |
|
}; |
|
|
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static const match_table_t rescue_tokens = { |
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{Opt_usebackuproot, "usebackuproot"}, |
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{Opt_nologreplay, "nologreplay"}, |
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{Opt_ignorebadroots, "ignorebadroots"}, |
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{Opt_ignorebadroots, "ibadroots"}, |
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{Opt_ignoredatacsums, "ignoredatacsums"}, |
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{Opt_ignoredatacsums, "idatacsums"}, |
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{Opt_rescue_all, "all"}, |
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{Opt_err, NULL}, |
|
}; |
|
|
|
static bool check_ro_option(struct btrfs_fs_info *fs_info, unsigned long opt, |
|
const char *opt_name) |
|
{ |
|
if (fs_info->mount_opt & opt) { |
|
btrfs_err(fs_info, "%s must be used with ro mount option", |
|
opt_name); |
|
return true; |
|
} |
|
return false; |
|
} |
|
|
|
static int parse_rescue_options(struct btrfs_fs_info *info, const char *options) |
|
{ |
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char *opts; |
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char *orig; |
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char *p; |
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substring_t args[MAX_OPT_ARGS]; |
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int ret = 0; |
|
|
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opts = kstrdup(options, GFP_KERNEL); |
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if (!opts) |
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return -ENOMEM; |
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orig = opts; |
|
|
|
while ((p = strsep(&opts, ":")) != NULL) { |
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int token; |
|
|
|
if (!*p) |
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continue; |
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token = match_token(p, rescue_tokens, args); |
|
switch (token){ |
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case Opt_usebackuproot: |
|
btrfs_info(info, |
|
"trying to use backup root at mount time"); |
|
btrfs_set_opt(info->mount_opt, USEBACKUPROOT); |
|
break; |
|
case Opt_nologreplay: |
|
btrfs_set_and_info(info, NOLOGREPLAY, |
|
"disabling log replay at mount time"); |
|
break; |
|
case Opt_ignorebadroots: |
|
btrfs_set_and_info(info, IGNOREBADROOTS, |
|
"ignoring bad roots"); |
|
break; |
|
case Opt_ignoredatacsums: |
|
btrfs_set_and_info(info, IGNOREDATACSUMS, |
|
"ignoring data csums"); |
|
break; |
|
case Opt_rescue_all: |
|
btrfs_info(info, "enabling all of the rescue options"); |
|
btrfs_set_and_info(info, IGNOREDATACSUMS, |
|
"ignoring data csums"); |
|
btrfs_set_and_info(info, IGNOREBADROOTS, |
|
"ignoring bad roots"); |
|
btrfs_set_and_info(info, NOLOGREPLAY, |
|
"disabling log replay at mount time"); |
|
break; |
|
case Opt_err: |
|
btrfs_info(info, "unrecognized rescue option '%s'", p); |
|
ret = -EINVAL; |
|
goto out; |
|
default: |
|
break; |
|
} |
|
|
|
} |
|
out: |
|
kfree(orig); |
|
return ret; |
|
} |
|
|
|
/* |
|
* Regular mount options parser. Everything that is needed only when |
|
* reading in a new superblock is parsed here. |
|
* XXX JDM: This needs to be cleaned up for remount. |
|
*/ |
|
int btrfs_parse_options(struct btrfs_fs_info *info, char *options, |
|
unsigned long new_flags) |
|
{ |
|
substring_t args[MAX_OPT_ARGS]; |
|
char *p, *num; |
|
int intarg; |
|
int ret = 0; |
|
char *compress_type; |
|
bool compress_force = false; |
|
enum btrfs_compression_type saved_compress_type; |
|
int saved_compress_level; |
|
bool saved_compress_force; |
|
int no_compress = 0; |
|
|
|
if (btrfs_fs_compat_ro(info, FREE_SPACE_TREE)) |
|
btrfs_set_opt(info->mount_opt, FREE_SPACE_TREE); |
|
else if (btrfs_free_space_cache_v1_active(info)) { |
|
if (btrfs_is_zoned(info)) { |
|
btrfs_info(info, |
|
"zoned: clearing existing space cache"); |
|
btrfs_set_super_cache_generation(info->super_copy, 0); |
|
} else { |
|
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 check; |
|
|
|
while ((p = strsep(&options, ",")) != NULL) { |
|
int token; |
|
if (!*p) |
|
continue; |
|
|
|
token = match_token(p, tokens, args); |
|
switch (token) { |
|
case Opt_degraded: |
|
btrfs_info(info, "allowing degraded mounts"); |
|
btrfs_set_opt(info->mount_opt, DEGRADED); |
|
break; |
|
case Opt_subvol: |
|
case Opt_subvol_empty: |
|
case Opt_subvolid: |
|
case Opt_device: |
|
/* |
|
* These are parsed by btrfs_parse_subvol_options or |
|
* btrfs_parse_device_options and can be ignored here. |
|
*/ |
|
break; |
|
case Opt_nodatasum: |
|
btrfs_set_and_info(info, NODATASUM, |
|
"setting nodatasum"); |
|
break; |
|
case Opt_datasum: |
|
if (btrfs_test_opt(info, NODATASUM)) { |
|
if (btrfs_test_opt(info, NODATACOW)) |
|
btrfs_info(info, |
|
"setting datasum, datacow enabled"); |
|
else |
|
btrfs_info(info, "setting datasum"); |
|
} |
|
btrfs_clear_opt(info->mount_opt, NODATACOW); |
|
btrfs_clear_opt(info->mount_opt, NODATASUM); |
|
break; |
|
case Opt_nodatacow: |
|
if (!btrfs_test_opt(info, NODATACOW)) { |
|
if (!btrfs_test_opt(info, COMPRESS) || |
|
!btrfs_test_opt(info, FORCE_COMPRESS)) { |
|
btrfs_info(info, |
|
"setting nodatacow, compression disabled"); |
|
} else { |
|
btrfs_info(info, "setting nodatacow"); |
|
} |
|
} |
|
btrfs_clear_opt(info->mount_opt, COMPRESS); |
|
btrfs_clear_opt(info->mount_opt, FORCE_COMPRESS); |
|
btrfs_set_opt(info->mount_opt, NODATACOW); |
|
btrfs_set_opt(info->mount_opt, NODATASUM); |
|
break; |
|
case Opt_datacow: |
|
btrfs_clear_and_info(info, NODATACOW, |
|
"setting datacow"); |
|
break; |
|
case Opt_compress_force: |
|
case Opt_compress_force_type: |
|
compress_force = true; |
|
fallthrough; |
|
case Opt_compress: |
|
case Opt_compress_type: |
|
saved_compress_type = btrfs_test_opt(info, |
|
COMPRESS) ? |
|
info->compress_type : BTRFS_COMPRESS_NONE; |
|
saved_compress_force = |
|
btrfs_test_opt(info, FORCE_COMPRESS); |
|
saved_compress_level = info->compress_level; |
|
if (token == Opt_compress || |
|
token == Opt_compress_force || |
|
strncmp(args[0].from, "zlib", 4) == 0) { |
|
compress_type = "zlib"; |
|
|
|
info->compress_type = BTRFS_COMPRESS_ZLIB; |
|
info->compress_level = BTRFS_ZLIB_DEFAULT_LEVEL; |
|
/* |
|
* args[0] contains uninitialized data since |
|
* for these tokens we don't expect any |
|
* parameter. |
|
*/ |
|
if (token != Opt_compress && |
|
token != Opt_compress_force) |
|
info->compress_level = |
|
btrfs_compress_str2level( |
|
BTRFS_COMPRESS_ZLIB, |
|
args[0].from + 4); |
|
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 (strncmp(args[0].from, "lzo", 3) == 0) { |
|
compress_type = "lzo"; |
|
info->compress_type = BTRFS_COMPRESS_LZO; |
|
info->compress_level = 0; |
|
btrfs_set_opt(info->mount_opt, COMPRESS); |
|
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, "zstd", 4) == 0) { |
|
compress_type = "zstd"; |
|
info->compress_type = BTRFS_COMPRESS_ZSTD; |
|
info->compress_level = |
|
btrfs_compress_str2level( |
|
BTRFS_COMPRESS_ZSTD, |
|
args[0].from + 4); |
|
btrfs_set_opt(info->mount_opt, COMPRESS); |
|
btrfs_clear_opt(info->mount_opt, NODATACOW); |
|
btrfs_clear_opt(info->mount_opt, NODATASUM); |
|
btrfs_set_fs_incompat(info, COMPRESS_ZSTD); |
|
no_compress = 0; |
|
} else if (strncmp(args[0].from, "no", 2) == 0) { |
|
compress_type = "no"; |
|
info->compress_level = 0; |
|
info->compress_type = 0; |
|
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_opt(info->mount_opt, FORCE_COMPRESS); |
|
} else { |
|
/* |
|
* If we remount from compress-force=xxx to |
|
* compress=xxx, we need clear FORCE_COMPRESS |
|
* flag, otherwise, there is no way for users |
|
* to disable forcible compression separately. |
|
*/ |
|
btrfs_clear_opt(info->mount_opt, FORCE_COMPRESS); |
|
} |
|
if (no_compress == 1) { |
|
btrfs_info(info, "use no compression"); |
|
} else if ((info->compress_type != saved_compress_type) || |
|
(compress_force != saved_compress_force) || |
|
(info->compress_level != saved_compress_level)) { |
|
btrfs_info(info, "%s %s compression, level %d", |
|
(compress_force) ? "force" : "use", |
|
compress_type, info->compress_level); |
|
} |
|
compress_force = false; |
|
break; |
|
case Opt_ssd: |
|
btrfs_set_and_info(info, SSD, |
|
"enabling ssd optimizations"); |
|
btrfs_clear_opt(info->mount_opt, NOSSD); |
|
break; |
|
case Opt_ssd_spread: |
|
btrfs_set_and_info(info, SSD, |
|
"enabling ssd optimizations"); |
|
btrfs_set_and_info(info, SSD_SPREAD, |
|
"using spread ssd allocation scheme"); |
|
btrfs_clear_opt(info->mount_opt, NOSSD); |
|
break; |
|
case Opt_nossd: |
|
btrfs_set_opt(info->mount_opt, NOSSD); |
|
btrfs_clear_and_info(info, SSD, |
|
"not using ssd optimizations"); |
|
fallthrough; |
|
case Opt_nossd_spread: |
|
btrfs_clear_and_info(info, SSD_SPREAD, |
|
"not using spread ssd allocation scheme"); |
|
break; |
|
case Opt_barrier: |
|
btrfs_clear_and_info(info, NOBARRIER, |
|
"turning on barriers"); |
|
break; |
|
case Opt_nobarrier: |
|
btrfs_set_and_info(info, NOBARRIER, |
|
"turning off barriers"); |
|
break; |
|
case Opt_thread_pool: |
|
ret = match_int(&args[0], &intarg); |
|
if (ret) { |
|
goto out; |
|
} else if (intarg == 0) { |
|
ret = -EINVAL; |
|
goto out; |
|
} |
|
info->thread_pool_size = intarg; |
|
break; |
|
case Opt_max_inline: |
|
num = match_strdup(&args[0]); |
|
if (num) { |
|
info->max_inline = memparse(num, NULL); |
|
kfree(num); |
|
|
|
if (info->max_inline) { |
|
info->max_inline = min_t(u64, |
|
info->max_inline, |
|
info->sectorsize); |
|
} |
|
btrfs_info(info, "max_inline at %llu", |
|
info->max_inline); |
|
} else { |
|
ret = -ENOMEM; |
|
goto out; |
|
} |
|
break; |
|
case Opt_acl: |
|
#ifdef CONFIG_BTRFS_FS_POSIX_ACL |
|
info->sb->s_flags |= SB_POSIXACL; |
|
break; |
|
#else |
|
btrfs_err(info, "support for ACL not compiled in!"); |
|
ret = -EINVAL; |
|
goto out; |
|
#endif |
|
case Opt_noacl: |
|
info->sb->s_flags &= ~SB_POSIXACL; |
|
break; |
|
case Opt_notreelog: |
|
btrfs_set_and_info(info, NOTREELOG, |
|
"disabling tree log"); |
|
break; |
|
case Opt_treelog: |
|
btrfs_clear_and_info(info, NOTREELOG, |
|
"enabling tree log"); |
|
break; |
|
case Opt_norecovery: |
|
case Opt_nologreplay: |
|
btrfs_warn(info, |
|
"'nologreplay' is deprecated, use 'rescue=nologreplay' instead"); |
|
btrfs_set_and_info(info, NOLOGREPLAY, |
|
"disabling log replay at mount time"); |
|
break; |
|
case Opt_flushoncommit: |
|
btrfs_set_and_info(info, FLUSHONCOMMIT, |
|
"turning on flush-on-commit"); |
|
break; |
|
case Opt_noflushoncommit: |
|
btrfs_clear_and_info(info, FLUSHONCOMMIT, |
|
"turning off flush-on-commit"); |
|
break; |
|
case Opt_ratio: |
|
ret = match_int(&args[0], &intarg); |
|
if (ret) |
|
goto out; |
|
info->metadata_ratio = intarg; |
|
btrfs_info(info, "metadata ratio %u", |
|
info->metadata_ratio); |
|
break; |
|
case Opt_discard: |
|
case Opt_discard_mode: |
|
if (token == Opt_discard || |
|
strcmp(args[0].from, "sync") == 0) { |
|
btrfs_clear_opt(info->mount_opt, DISCARD_ASYNC); |
|
btrfs_set_and_info(info, DISCARD_SYNC, |
|
"turning on sync discard"); |
|
} else if (strcmp(args[0].from, "async") == 0) { |
|
btrfs_clear_opt(info->mount_opt, DISCARD_SYNC); |
|
btrfs_set_and_info(info, DISCARD_ASYNC, |
|
"turning on async discard"); |
|
} else { |
|
ret = -EINVAL; |
|
goto out; |
|
} |
|
break; |
|
case Opt_nodiscard: |
|
btrfs_clear_and_info(info, DISCARD_SYNC, |
|
"turning off discard"); |
|
btrfs_clear_and_info(info, DISCARD_ASYNC, |
|
"turning off async discard"); |
|
break; |
|
case Opt_space_cache: |
|
case Opt_space_cache_version: |
|
if (token == Opt_space_cache || |
|
strcmp(args[0].from, "v1") == 0) { |
|
btrfs_clear_opt(info->mount_opt, |
|
FREE_SPACE_TREE); |
|
btrfs_set_and_info(info, SPACE_CACHE, |
|
"enabling disk space caching"); |
|
} else if (strcmp(args[0].from, "v2") == 0) { |
|
btrfs_clear_opt(info->mount_opt, |
|
SPACE_CACHE); |
|
btrfs_set_and_info(info, 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: |
|
if (btrfs_test_opt(info, SPACE_CACHE)) { |
|
btrfs_clear_and_info(info, SPACE_CACHE, |
|
"disabling disk space caching"); |
|
} |
|
if (btrfs_test_opt(info, FREE_SPACE_TREE)) { |
|
btrfs_clear_and_info(info, FREE_SPACE_TREE, |
|
"disabling free space tree"); |
|
} |
|
break; |
|
case Opt_inode_cache: |
|
case Opt_noinode_cache: |
|
btrfs_warn(info, |
|
"the 'inode_cache' option is deprecated and has no effect since 5.11"); |
|
break; |
|
case Opt_clear_cache: |
|
btrfs_set_and_info(info, CLEAR_CACHE, |
|
"force clearing of disk cache"); |
|
break; |
|
case Opt_user_subvol_rm_allowed: |
|
btrfs_set_opt(info->mount_opt, USER_SUBVOL_RM_ALLOWED); |
|
break; |
|
case Opt_enospc_debug: |
|
btrfs_set_opt(info->mount_opt, ENOSPC_DEBUG); |
|
break; |
|
case Opt_noenospc_debug: |
|
btrfs_clear_opt(info->mount_opt, ENOSPC_DEBUG); |
|
break; |
|
case Opt_defrag: |
|
btrfs_set_and_info(info, AUTO_DEFRAG, |
|
"enabling auto defrag"); |
|
break; |
|
case Opt_nodefrag: |
|
btrfs_clear_and_info(info, AUTO_DEFRAG, |
|
"disabling auto defrag"); |
|
break; |
|
case Opt_recovery: |
|
case Opt_usebackuproot: |
|
btrfs_warn(info, |
|
"'%s' is deprecated, use 'rescue=usebackuproot' instead", |
|
token == Opt_recovery ? "recovery" : |
|
"usebackuproot"); |
|
btrfs_info(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); |
|
break; |
|
#ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY |
|
case Opt_check_integrity_including_extent_data: |
|
btrfs_info(info, |
|
"enabling check integrity including extent data"); |
|
btrfs_set_opt(info->mount_opt, CHECK_INTEGRITY_DATA); |
|
btrfs_set_opt(info->mount_opt, CHECK_INTEGRITY); |
|
break; |
|
case Opt_check_integrity: |
|
btrfs_info(info, "enabling check integrity"); |
|
btrfs_set_opt(info->mount_opt, CHECK_INTEGRITY); |
|
break; |
|
case Opt_check_integrity_print_mask: |
|
ret = match_int(&args[0], &intarg); |
|
if (ret) |
|
goto out; |
|
info->check_integrity_print_mask = intarg; |
|
btrfs_info(info, "check_integrity_print_mask 0x%x", |
|
info->check_integrity_print_mask); |
|
break; |
|
#else |
|
case Opt_check_integrity_including_extent_data: |
|
case Opt_check_integrity: |
|
case Opt_check_integrity_print_mask: |
|
btrfs_err(info, |
|
"support for check_integrity* not compiled in!"); |
|
ret = -EINVAL; |
|
goto out; |
|
#endif |
|
case Opt_fatal_errors: |
|
if (strcmp(args[0].from, "panic") == 0) |
|
btrfs_set_opt(info->mount_opt, |
|
PANIC_ON_FATAL_ERROR); |
|
else if (strcmp(args[0].from, "bug") == 0) |
|
btrfs_clear_opt(info->mount_opt, |
|
PANIC_ON_FATAL_ERROR); |
|
else { |
|
ret = -EINVAL; |
|
goto out; |
|
} |
|
break; |
|
case Opt_commit_interval: |
|
intarg = 0; |
|
ret = match_int(&args[0], &intarg); |
|
if (ret) |
|
goto out; |
|
if (intarg == 0) { |
|
btrfs_info(info, |
|
"using default commit interval %us", |
|
BTRFS_DEFAULT_COMMIT_INTERVAL); |
|
intarg = BTRFS_DEFAULT_COMMIT_INTERVAL; |
|
} else if (intarg > 300) { |
|
btrfs_warn(info, "excessive commit interval %d", |
|
intarg); |
|
} |
|
info->commit_interval = intarg; |
|
break; |
|
case Opt_rescue: |
|
ret = parse_rescue_options(info, args[0].from); |
|
if (ret < 0) |
|
goto out; |
|
break; |
|
#ifdef CONFIG_BTRFS_DEBUG |
|
case Opt_fragment_all: |
|
btrfs_info(info, "fragmenting all space"); |
|
btrfs_set_opt(info->mount_opt, FRAGMENT_DATA); |
|
btrfs_set_opt(info->mount_opt, FRAGMENT_METADATA); |
|
break; |
|
case Opt_fragment_metadata: |
|
btrfs_info(info, "fragmenting metadata"); |
|
btrfs_set_opt(info->mount_opt, |
|
FRAGMENT_METADATA); |
|
break; |
|
case Opt_fragment_data: |
|
btrfs_info(info, "fragmenting data"); |
|
btrfs_set_opt(info->mount_opt, FRAGMENT_DATA); |
|
break; |
|
#endif |
|
#ifdef CONFIG_BTRFS_FS_REF_VERIFY |
|
case Opt_ref_verify: |
|
btrfs_info(info, "doing ref verification"); |
|
btrfs_set_opt(info->mount_opt, REF_VERIFY); |
|
break; |
|
#endif |
|
case Opt_err: |
|
btrfs_err(info, "unrecognized mount option '%s'", p); |
|
ret = -EINVAL; |
|
goto out; |
|
default: |
|
break; |
|
} |
|
} |
|
check: |
|
/* We're read-only, don't have to check. */ |
|
if (new_flags & SB_RDONLY) |
|
goto out; |
|
|
|
if (check_ro_option(info, BTRFS_MOUNT_NOLOGREPLAY, "nologreplay") || |
|
check_ro_option(info, BTRFS_MOUNT_IGNOREBADROOTS, "ignorebadroots") || |
|
check_ro_option(info, BTRFS_MOUNT_IGNOREDATACSUMS, "ignoredatacsums")) |
|
ret = -EINVAL; |
|
out: |
|
if (btrfs_fs_compat_ro(info, FREE_SPACE_TREE) && |
|
!btrfs_test_opt(info, FREE_SPACE_TREE) && |
|
!btrfs_test_opt(info, CLEAR_CACHE)) { |
|
btrfs_err(info, "cannot disable free space tree"); |
|
ret = -EINVAL; |
|
|
|
} |
|
if (!ret) |
|
ret = btrfs_check_mountopts_zoned(info); |
|
if (!ret && btrfs_test_opt(info, SPACE_CACHE)) |
|
btrfs_info(info, "disk space caching is enabled"); |
|
if (!ret && btrfs_test_opt(info, FREE_SPACE_TREE)) |
|
btrfs_info(info, "using free space tree"); |
|
return ret; |
|
} |
|
|
|
/* |
|
* Parse mount options that are required early in the mount process. |
|
* |
|
* All other options will be parsed on much later in the mount process and |
|
* only when we need to allocate a new super block. |
|
*/ |
|
static int btrfs_parse_device_options(const char *options, fmode_t flags, |
|
void *holder) |
|
{ |
|
substring_t args[MAX_OPT_ARGS]; |
|
char *device_name, *opts, *orig, *p; |
|
struct btrfs_device *device = NULL; |
|
int error = 0; |
|
|
|
lockdep_assert_held(&uuid_mutex); |
|
|
|
if (!options) |
|
return 0; |
|
|
|
/* |
|
* strsep changes the string, duplicate it because btrfs_parse_options |
|
* gets called later |
|
*/ |
|
opts = kstrdup(options, GFP_KERNEL); |
|
if (!opts) |
|
return -ENOMEM; |
|
orig = opts; |
|
|
|
while ((p = strsep(&opts, ",")) != NULL) { |
|
int token; |
|
|
|
if (!*p) |
|
continue; |
|
|
|
token = match_token(p, tokens, args); |
|
if (token == Opt_device) { |
|
device_name = match_strdup(&args[0]); |
|
if (!device_name) { |
|
error = -ENOMEM; |
|
goto out; |
|
} |
|
device = btrfs_scan_one_device(device_name, flags, |
|
holder); |
|
kfree(device_name); |
|
if (IS_ERR(device)) { |
|
error = PTR_ERR(device); |
|
goto out; |
|
} |
|
} |
|
} |
|
|
|
out: |
|
kfree(orig); |
|
return error; |
|
} |
|
|
|
/* |
|
* Parse mount options that are related to subvolume id |
|
* |
|
* The value is later passed to mount_subvol() |
|
*/ |
|
static int btrfs_parse_subvol_options(const char *options, char **subvol_name, |
|
u64 *subvol_objectid) |
|
{ |
|
substring_t args[MAX_OPT_ARGS]; |
|
char *opts, *orig, *p; |
|
int error = 0; |
|
u64 subvolid; |
|
|
|
if (!options) |
|
return 0; |
|
|
|
/* |
|
* strsep changes the string, duplicate it because |
|
* btrfs_parse_device_options gets called later |
|
*/ |
|
opts = kstrdup(options, GFP_KERNEL); |
|
if (!opts) |
|
return -ENOMEM; |
|
orig = opts; |
|
|
|
while ((p = strsep(&opts, ",")) != NULL) { |
|
int token; |
|
if (!*p) |
|
continue; |
|
|
|
token = match_token(p, tokens, args); |
|
switch (token) { |
|
case Opt_subvol: |
|
kfree(*subvol_name); |
|
*subvol_name = match_strdup(&args[0]); |
|
if (!*subvol_name) { |
|
error = -ENOMEM; |
|
goto out; |
|
} |
|
break; |
|
case Opt_subvolid: |
|
error = match_u64(&args[0], &subvolid); |
|
if (error) |
|
goto out; |
|
|
|
/* we want the original fs_tree */ |
|
if (subvolid == 0) |
|
subvolid = BTRFS_FS_TREE_OBJECTID; |
|
|
|
*subvol_objectid = subvolid; |
|
break; |
|
default: |
|
break; |
|
} |
|
} |
|
|
|
out: |
|
kfree(orig); |
|
return error; |
|
} |
|
|
|
char *btrfs_get_subvol_name_from_objectid(struct btrfs_fs_info *fs_info, |
|
u64 subvol_objectid) |
|
{ |
|
struct btrfs_root *root = fs_info->tree_root; |
|
struct btrfs_root *fs_root = NULL; |
|
struct btrfs_root_ref *root_ref; |
|
struct btrfs_inode_ref *inode_ref; |
|
struct btrfs_key key; |
|
struct btrfs_path *path = NULL; |
|
char *name = NULL, *ptr; |
|
u64 dirid; |
|
int len; |
|
int ret; |
|
|
|
path = btrfs_alloc_path(); |
|
if (!path) { |
|
ret = -ENOMEM; |
|
goto err; |
|
} |
|
|
|
name = kmalloc(PATH_MAX, GFP_KERNEL); |
|
if (!name) { |
|
ret = -ENOMEM; |
|
goto err; |
|
} |
|
ptr = name + PATH_MAX - 1; |
|
ptr[0] = '\0'; |
|
|
|
/* |
|
* Walk up the subvolume trees in the tree of tree roots by root |
|
* backrefs until we hit the top-level subvolume. |
|
*/ |
|
while (subvol_objectid != BTRFS_FS_TREE_OBJECTID) { |
|
key.objectid = subvol_objectid; |
|
key.type = BTRFS_ROOT_BACKREF_KEY; |
|
key.offset = (u64)-1; |
|
|
|
ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
|
if (ret < 0) { |
|
goto err; |
|
} else if (ret > 0) { |
|
ret = btrfs_previous_item(root, path, subvol_objectid, |
|
BTRFS_ROOT_BACKREF_KEY); |
|
if (ret < 0) { |
|
goto err; |
|
} else if (ret > 0) { |
|
ret = -ENOENT; |
|
goto err; |
|
} |
|
} |
|
|
|
btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); |
|
subvol_objectid = key.offset; |
|
|
|
root_ref = btrfs_item_ptr(path->nodes[0], path->slots[0], |
|
struct btrfs_root_ref); |
|
len = btrfs_root_ref_name_len(path->nodes[0], root_ref); |
|
ptr -= len + 1; |
|
if (ptr < name) { |
|
ret = -ENAMETOOLONG; |
|
goto err; |
|
} |
|
read_extent_buffer(path->nodes[0], ptr + 1, |
|
(unsigned long)(root_ref + 1), len); |
|
ptr[0] = '/'; |
|
dirid = btrfs_root_ref_dirid(path->nodes[0], root_ref); |
|
btrfs_release_path(path); |
|
|
|
fs_root = btrfs_get_fs_root(fs_info, subvol_objectid, true); |
|
if (IS_ERR(fs_root)) { |
|
ret = PTR_ERR(fs_root); |
|
fs_root = NULL; |
|
goto err; |
|
} |
|
|
|
/* |
|
* Walk up the filesystem tree by inode refs until we hit the |
|
* root directory. |
|
*/ |
|
while (dirid != BTRFS_FIRST_FREE_OBJECTID) { |
|
key.objectid = dirid; |
|
key.type = BTRFS_INODE_REF_KEY; |
|
key.offset = (u64)-1; |
|
|
|
ret = btrfs_search_slot(NULL, fs_root, &key, path, 0, 0); |
|
if (ret < 0) { |
|
goto err; |
|
} else if (ret > 0) { |
|
ret = btrfs_previous_item(fs_root, path, dirid, |
|
BTRFS_INODE_REF_KEY); |
|
if (ret < 0) { |
|
goto err; |
|
} else if (ret > 0) { |
|
ret = -ENOENT; |
|
goto err; |
|
} |
|
} |
|
|
|
btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); |
|
dirid = key.offset; |
|
|
|
inode_ref = btrfs_item_ptr(path->nodes[0], |
|
path->slots[0], |
|
struct btrfs_inode_ref); |
|
len = btrfs_inode_ref_name_len(path->nodes[0], |
|
inode_ref); |
|
ptr -= len + 1; |
|
if (ptr < name) { |
|
ret = -ENAMETOOLONG; |
|
goto err; |
|
} |
|
read_extent_buffer(path->nodes[0], ptr + 1, |
|
(unsigned long)(inode_ref + 1), len); |
|
ptr[0] = '/'; |
|
btrfs_release_path(path); |
|
} |
|
btrfs_put_root(fs_root); |
|
fs_root = NULL; |
|
} |
|
|
|
btrfs_free_path(path); |
|
if (ptr == name + PATH_MAX - 1) { |
|
name[0] = '/'; |
|
name[1] = '\0'; |
|
} else { |
|
memmove(name, ptr, name + PATH_MAX - ptr); |
|
} |
|
return name; |
|
|
|
err: |
|
btrfs_put_root(fs_root); |
|
btrfs_free_path(path); |
|
kfree(name); |
|
return ERR_PTR(ret); |
|
} |
|
|
|
static int get_default_subvol_objectid(struct btrfs_fs_info *fs_info, u64 *objectid) |
|
{ |
|
struct btrfs_root *root = fs_info->tree_root; |
|
struct btrfs_dir_item *di; |
|
struct btrfs_path *path; |
|
struct btrfs_key location; |
|
u64 dir_id; |
|
|
|
path = btrfs_alloc_path(); |
|
if (!path) |
|
return -ENOMEM; |
|
|
|
/* |
|
* Find the "default" dir item which points to the root item that we |
|
* will mount by default if we haven't been given a specific subvolume |
|
* to mount. |
|
*/ |
|
dir_id = btrfs_super_root_dir(fs_info->super_copy); |
|
di = btrfs_lookup_dir_item(NULL, root, path, dir_id, "default", 7, 0); |
|
if (IS_ERR(di)) { |
|
btrfs_free_path(path); |
|
return PTR_ERR(di); |
|
} |
|
if (!di) { |
|
/* |
|
* Ok the default dir item isn't there. This is weird since |
|
* it's always been there, but don't freak out, just try and |
|
* mount the top-level subvolume. |
|
*/ |
|
btrfs_free_path(path); |
|
*objectid = BTRFS_FS_TREE_OBJECTID; |
|
return 0; |
|
} |
|
|
|
btrfs_dir_item_key_to_cpu(path->nodes[0], di, &location); |
|
btrfs_free_path(path); |
|
*objectid = location.objectid; |
|
return 0; |
|
} |
|
|
|
static int btrfs_fill_super(struct super_block *sb, |
|
struct btrfs_fs_devices *fs_devices, |
|
void *data) |
|
{ |
|
struct inode *inode; |
|
struct btrfs_fs_info *fs_info = btrfs_sb(sb); |
|
int err; |
|
|
|
sb->s_maxbytes = MAX_LFS_FILESIZE; |
|
sb->s_magic = BTRFS_SUPER_MAGIC; |
|
sb->s_op = &btrfs_super_ops; |
|
sb->s_d_op = &btrfs_dentry_operations; |
|
sb->s_export_op = &btrfs_export_ops; |
|
sb->s_xattr = btrfs_xattr_handlers; |
|
sb->s_time_gran = 1; |
|
#ifdef CONFIG_BTRFS_FS_POSIX_ACL |
|
sb->s_flags |= SB_POSIXACL; |
|
#endif |
|
sb->s_flags |= SB_I_VERSION; |
|
sb->s_iflags |= SB_I_CGROUPWB; |
|
|
|
err = super_setup_bdi(sb); |
|
if (err) { |
|
btrfs_err(fs_info, "super_setup_bdi failed"); |
|
return err; |
|
} |
|
|
|
err = open_ctree(sb, fs_devices, (char *)data); |
|
if (err) { |
|
btrfs_err(fs_info, "open_ctree failed"); |
|
return err; |
|
} |
|
|
|
inode = btrfs_iget(sb, BTRFS_FIRST_FREE_OBJECTID, fs_info->fs_root); |
|
if (IS_ERR(inode)) { |
|
err = PTR_ERR(inode); |
|
goto fail_close; |
|
} |
|
|
|
sb->s_root = d_make_root(inode); |
|
if (!sb->s_root) { |
|
err = -ENOMEM; |
|
goto fail_close; |
|
} |
|
|
|
cleancache_init_fs(sb); |
|
sb->s_flags |= SB_ACTIVE; |
|
return 0; |
|
|
|
fail_close: |
|
close_ctree(fs_info); |
|
return err; |
|
} |
|
|
|
int btrfs_sync_fs(struct super_block *sb, int wait) |
|
{ |
|
struct btrfs_trans_handle *trans; |
|
struct btrfs_fs_info *fs_info = btrfs_sb(sb); |
|
struct btrfs_root *root = fs_info->tree_root; |
|
|
|
trace_btrfs_sync_fs(fs_info, wait); |
|
|
|
if (!wait) { |
|
filemap_flush(fs_info->btree_inode->i_mapping); |
|
return 0; |
|
} |
|
|
|
btrfs_wait_ordered_roots(fs_info, U64_MAX, 0, (u64)-1); |
|
|
|
trans = btrfs_attach_transaction_barrier(root); |
|
if (IS_ERR(trans)) { |
|
/* no transaction, don't bother */ |
|
if (PTR_ERR(trans) == -ENOENT) { |
|
/* |
|
* Exit unless we have some pending changes |
|
* that need to go through commit |
|
*/ |
|
if (fs_info->pending_changes == 0) |
|
return 0; |
|
/* |
|
* A non-blocking test if the fs is frozen. We must not |
|
* start a new transaction here otherwise a deadlock |
|
* happens. The pending operations are delayed to the |
|
* next commit after thawing. |
|
*/ |
|
if (sb_start_write_trylock(sb)) |
|
sb_end_write(sb); |
|
else |
|
return 0; |
|
trans = btrfs_start_transaction(root, 0); |
|
} |
|
if (IS_ERR(trans)) |
|
return PTR_ERR(trans); |
|
} |
|
return btrfs_commit_transaction(trans); |
|
} |
|
|
|
static void print_rescue_option(struct seq_file *seq, const char *s, bool *printed) |
|
{ |
|
seq_printf(seq, "%s%s", (*printed) ? ":" : ",rescue=", s); |
|
*printed = true; |
|
} |
|
|
|
static int btrfs_show_options(struct seq_file *seq, struct dentry *dentry) |
|
{ |
|
struct btrfs_fs_info *info = btrfs_sb(dentry->d_sb); |
|
const char *compress_type; |
|
const char *subvol_name; |
|
bool printed = false; |
|
|
|
if (btrfs_test_opt(info, DEGRADED)) |
|
seq_puts(seq, ",degraded"); |
|
if (btrfs_test_opt(info, NODATASUM)) |
|
seq_puts(seq, ",nodatasum"); |
|
if (btrfs_test_opt(info, NODATACOW)) |
|
seq_puts(seq, ",nodatacow"); |
|
if (btrfs_test_opt(info, NOBARRIER)) |
|
seq_puts(seq, ",nobarrier"); |
|
if (info->max_inline != BTRFS_DEFAULT_MAX_INLINE) |
|
seq_printf(seq, ",max_inline=%llu", info->max_inline); |
|
if (info->thread_pool_size != min_t(unsigned long, |
|
num_online_cpus() + 2, 8)) |
|
seq_printf(seq, ",thread_pool=%u", info->thread_pool_size); |
|
if (btrfs_test_opt(info, COMPRESS)) { |
|
compress_type = btrfs_compress_type2str(info->compress_type); |
|
if (btrfs_test_opt(info, FORCE_COMPRESS)) |
|
seq_printf(seq, ",compress-force=%s", compress_type); |
|
else |
|
seq_printf(seq, ",compress=%s", compress_type); |
|
if (info->compress_level) |
|
seq_printf(seq, ":%d", info->compress_level); |
|
} |
|
if (btrfs_test_opt(info, NOSSD)) |
|
seq_puts(seq, ",nossd"); |
|
if (btrfs_test_opt(info, SSD_SPREAD)) |
|
seq_puts(seq, ",ssd_spread"); |
|
else if (btrfs_test_opt(info, SSD)) |
|
seq_puts(seq, ",ssd"); |
|
if (btrfs_test_opt(info, NOTREELOG)) |
|
seq_puts(seq, ",notreelog"); |
|
if (btrfs_test_opt(info, NOLOGREPLAY)) |
|
print_rescue_option(seq, "nologreplay", &printed); |
|
if (btrfs_test_opt(info, USEBACKUPROOT)) |
|
print_rescue_option(seq, "usebackuproot", &printed); |
|
if (btrfs_test_opt(info, IGNOREBADROOTS)) |
|
print_rescue_option(seq, "ignorebadroots", &printed); |
|
if (btrfs_test_opt(info, IGNOREDATACSUMS)) |
|
print_rescue_option(seq, "ignoredatacsums", &printed); |
|
if (btrfs_test_opt(info, FLUSHONCOMMIT)) |
|
seq_puts(seq, ",flushoncommit"); |
|
if (btrfs_test_opt(info, DISCARD_SYNC)) |
|
seq_puts(seq, ",discard"); |
|
if (btrfs_test_opt(info, DISCARD_ASYNC)) |
|
seq_puts(seq, ",discard=async"); |
|
if (!(info->sb->s_flags & SB_POSIXACL)) |
|
seq_puts(seq, ",noacl"); |
|
if (btrfs_free_space_cache_v1_active(info)) |
|
seq_puts(seq, ",space_cache"); |
|
else if (btrfs_fs_compat_ro(info, FREE_SPACE_TREE)) |
|
seq_puts(seq, ",space_cache=v2"); |
|
else |
|
seq_puts(seq, ",nospace_cache"); |
|
if (btrfs_test_opt(info, RESCAN_UUID_TREE)) |
|
seq_puts(seq, ",rescan_uuid_tree"); |
|
if (btrfs_test_opt(info, CLEAR_CACHE)) |
|
seq_puts(seq, ",clear_cache"); |
|
if (btrfs_test_opt(info, USER_SUBVOL_RM_ALLOWED)) |
|
seq_puts(seq, ",user_subvol_rm_allowed"); |
|
if (btrfs_test_opt(info, ENOSPC_DEBUG)) |
|
seq_puts(seq, ",enospc_debug"); |
|
if (btrfs_test_opt(info, AUTO_DEFRAG)) |
|
seq_puts(seq, ",autodefrag"); |
|
if (btrfs_test_opt(info, SKIP_BALANCE)) |
|
seq_puts(seq, ",skip_balance"); |
|
#ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY |
|
if (btrfs_test_opt(info, CHECK_INTEGRITY_DATA)) |
|
seq_puts(seq, ",check_int_data"); |
|
else if (btrfs_test_opt(info, CHECK_INTEGRITY)) |
|
seq_puts(seq, ",check_int"); |
|
if (info->check_integrity_print_mask) |
|
seq_printf(seq, ",check_int_print_mask=%d", |
|
info->check_integrity_print_mask); |
|
#endif |
|
if (info->metadata_ratio) |
|
seq_printf(seq, ",metadata_ratio=%u", info->metadata_ratio); |
|
if (btrfs_test_opt(info, PANIC_ON_FATAL_ERROR)) |
|
seq_puts(seq, ",fatal_errors=panic"); |
|
if (info->commit_interval != BTRFS_DEFAULT_COMMIT_INTERVAL) |
|
seq_printf(seq, ",commit=%u", info->commit_interval); |
|
#ifdef CONFIG_BTRFS_DEBUG |
|
if (btrfs_test_opt(info, FRAGMENT_DATA)) |
|
seq_puts(seq, ",fragment=data"); |
|
if (btrfs_test_opt(info, FRAGMENT_METADATA)) |
|
seq_puts(seq, ",fragment=metadata"); |
|
#endif |
|
if (btrfs_test_opt(info, REF_VERIFY)) |
|
seq_puts(seq, ",ref_verify"); |
|
seq_printf(seq, ",subvolid=%llu", |
|
BTRFS_I(d_inode(dentry))->root->root_key.objectid); |
|
subvol_name = btrfs_get_subvol_name_from_objectid(info, |
|
BTRFS_I(d_inode(dentry))->root->root_key.objectid); |
|
if (!IS_ERR(subvol_name)) { |
|
seq_puts(seq, ",subvol="); |
|
seq_escape(seq, subvol_name, " \t\n\\"); |
|
kfree(subvol_name); |
|
} |
|
return 0; |
|
} |
|
|
|
static int btrfs_test_super(struct super_block *s, void *data) |
|
{ |
|
struct btrfs_fs_info *p = data; |
|
struct btrfs_fs_info *fs_info = btrfs_sb(s); |
|
|
|
return fs_info->fs_devices == p->fs_devices; |
|
} |
|
|
|
static int btrfs_set_super(struct super_block *s, void *data) |
|
{ |
|
int err = set_anon_super(s, data); |
|
if (!err) |
|
s->s_fs_info = data; |
|
return err; |
|
} |
|
|
|
/* |
|
* subvolumes are identified by ino 256 |
|
*/ |
|
static inline int is_subvolume_inode(struct inode *inode) |
|
{ |
|
if (inode && inode->i_ino == BTRFS_FIRST_FREE_OBJECTID) |
|
return 1; |
|
return 0; |
|
} |
|
|
|
static struct dentry *mount_subvol(const char *subvol_name, u64 subvol_objectid, |
|
struct vfsmount *mnt) |
|
{ |
|
struct dentry *root; |
|
int ret; |
|
|
|
if (!subvol_name) { |
|
if (!subvol_objectid) { |
|
ret = get_default_subvol_objectid(btrfs_sb(mnt->mnt_sb), |
|
&subvol_objectid); |
|
if (ret) { |
|
root = ERR_PTR(ret); |
|
goto out; |
|
} |
|
} |
|
subvol_name = btrfs_get_subvol_name_from_objectid( |
|
btrfs_sb(mnt->mnt_sb), subvol_objectid); |
|
if (IS_ERR(subvol_name)) { |
|
root = ERR_CAST(subvol_name); |
|
subvol_name = NULL; |
|
goto out; |
|
} |
|
|
|
} |
|
|
|
root = mount_subtree(mnt, subvol_name); |
|
/* mount_subtree() drops our reference on the vfsmount. */ |
|
mnt = NULL; |
|
|
|
if (!IS_ERR(root)) { |
|
struct super_block *s = root->d_sb; |
|
struct btrfs_fs_info *fs_info = btrfs_sb(s); |
|
struct inode *root_inode = d_inode(root); |
|
u64 root_objectid = BTRFS_I(root_inode)->root->root_key.objectid; |
|
|
|
ret = 0; |
|
if (!is_subvolume_inode(root_inode)) { |
|
btrfs_err(fs_info, "'%s' is not a valid subvolume", |
|
subvol_name); |
|
ret = -EINVAL; |
|
} |
|
if (subvol_objectid && root_objectid != subvol_objectid) { |
|
/* |
|
* This will also catch a race condition where a |
|
* subvolume which was passed by ID is renamed and |
|
* another subvolume is renamed over the old location. |
|
*/ |
|
btrfs_err(fs_info, |
|
"subvol '%s' does not match subvolid %llu", |
|
subvol_name, subvol_objectid); |
|
ret = -EINVAL; |
|
} |
|
if (ret) { |
|
dput(root); |
|
root = ERR_PTR(ret); |
|
deactivate_locked_super(s); |
|
} |
|
} |
|
|
|
out: |
|
mntput(mnt); |
|
kfree(subvol_name); |
|
return root; |
|
} |
|
|
|
/* |
|
* Find a superblock for the given device / mount point. |
|
* |
|
* Note: This is based on mount_bdev from fs/super.c with a few additions |
|
* for multiple device setup. Make sure to keep it in sync. |
|
*/ |
|
static struct dentry *btrfs_mount_root(struct file_system_type *fs_type, |
|
int flags, const char *device_name, void *data) |
|
{ |
|
struct block_device *bdev = NULL; |
|
struct super_block *s; |
|
struct btrfs_device *device = NULL; |
|
struct btrfs_fs_devices *fs_devices = NULL; |
|
struct btrfs_fs_info *fs_info = NULL; |
|
void *new_sec_opts = NULL; |
|
fmode_t mode = FMODE_READ; |
|
int error = 0; |
|
|
|
if (!(flags & SB_RDONLY)) |
|
mode |= FMODE_WRITE; |
|
|
|
if (data) { |
|
error = security_sb_eat_lsm_opts(data, &new_sec_opts); |
|
if (error) |
|
return ERR_PTR(error); |
|
} |
|
|
|
/* |
|
* Setup a dummy root and fs_info for test/set super. This is because |
|
* we don't actually fill this stuff out until open_ctree, but we need |
|
* then open_ctree will properly initialize the file system specific |
|
* settings later. btrfs_init_fs_info initializes the static elements |
|
* of the fs_info (locks and such) to make cleanup easier if we find a |
|
* superblock with our given fs_devices later on at sget() time. |
|
*/ |
|
fs_info = kvzalloc(sizeof(struct btrfs_fs_info), GFP_KERNEL); |
|
if (!fs_info) { |
|
error = -ENOMEM; |
|
goto error_sec_opts; |
|
} |
|
btrfs_init_fs_info(fs_info); |
|
|
|
fs_info->super_copy = kzalloc(BTRFS_SUPER_INFO_SIZE, GFP_KERNEL); |
|
fs_info->super_for_commit = kzalloc(BTRFS_SUPER_INFO_SIZE, GFP_KERNEL); |
|
if (!fs_info->super_copy || !fs_info->super_for_commit) { |
|
error = -ENOMEM; |
|
goto error_fs_info; |
|
} |
|
|
|
mutex_lock(&uuid_mutex); |
|
error = btrfs_parse_device_options(data, mode, fs_type); |
|
if (error) { |
|
mutex_unlock(&uuid_mutex); |
|
goto error_fs_info; |
|
} |
|
|
|
device = btrfs_scan_one_device(device_name, mode, fs_type); |
|
if (IS_ERR(device)) { |
|
mutex_unlock(&uuid_mutex); |
|
error = PTR_ERR(device); |
|
goto error_fs_info; |
|
} |
|
|
|
fs_devices = device->fs_devices; |
|
fs_info->fs_devices = fs_devices; |
|
|
|
error = btrfs_open_devices(fs_devices, mode, fs_type); |
|
mutex_unlock(&uuid_mutex); |
|
if (error) |
|
goto error_fs_info; |
|
|
|
if (!(flags & SB_RDONLY) && fs_devices->rw_devices == 0) { |
|
error = -EACCES; |
|
goto error_close_devices; |
|
} |
|
|
|
bdev = fs_devices->latest_bdev; |
|
s = sget(fs_type, btrfs_test_super, btrfs_set_super, flags | SB_NOSEC, |
|
fs_info); |
|
if (IS_ERR(s)) { |
|
error = PTR_ERR(s); |
|
goto error_close_devices; |
|
} |
|
|
|
if (s->s_root) { |
|
btrfs_close_devices(fs_devices); |
|
btrfs_free_fs_info(fs_info); |
|
if ((flags ^ s->s_flags) & SB_RDONLY) |
|
error = -EBUSY; |
|
} else { |
|
snprintf(s->s_id, sizeof(s->s_id), "%pg", bdev); |
|
btrfs_sb(s)->bdev_holder = fs_type; |
|
if (!strstr(crc32c_impl(), "generic")) |
|
set_bit(BTRFS_FS_CSUM_IMPL_FAST, &fs_info->flags); |
|
error = btrfs_fill_super(s, fs_devices, data); |
|
} |
|
if (!error) |
|
error = security_sb_set_mnt_opts(s, new_sec_opts, 0, NULL); |
|
security_free_mnt_opts(&new_sec_opts); |
|
if (error) { |
|
deactivate_locked_super(s); |
|
return ERR_PTR(error); |
|
} |
|
|
|
return dget(s->s_root); |
|
|
|
error_close_devices: |
|
btrfs_close_devices(fs_devices); |
|
error_fs_info: |
|
btrfs_free_fs_info(fs_info); |
|
error_sec_opts: |
|
security_free_mnt_opts(&new_sec_opts); |
|
return ERR_PTR(error); |
|
} |
|
|
|
/* |
|
* Mount function which is called by VFS layer. |
|
* |
|
* In order to allow mounting a subvolume directly, btrfs uses mount_subtree() |
|
* which needs vfsmount* of device's root (/). This means device's root has to |
|
* be mounted internally in any case. |
|
* |
|
* Operation flow: |
|
* 1. Parse subvol id related options for later use in mount_subvol(). |
|
* |
|
* 2. Mount device's root (/) by calling vfs_kern_mount(). |
|
* |
|
* NOTE: vfs_kern_mount() is used by VFS to call btrfs_mount() in the |
|
* first place. In order to avoid calling btrfs_mount() again, we use |
|
* different file_system_type which is not registered to VFS by |
|
* register_filesystem() (btrfs_root_fs_type). As a result, |
|
* btrfs_mount_root() is called. The return value will be used by |
|
* mount_subtree() in mount_subvol(). |
|
* |
|
* 3. Call mount_subvol() to get the dentry of subvolume. Since there is |
|
* "btrfs subvolume set-default", mount_subvol() is called always. |
|
*/ |
|
static struct dentry *btrfs_mount(struct file_system_type *fs_type, int flags, |
|
const char *device_name, void *data) |
|
{ |
|
struct vfsmount *mnt_root; |
|
struct dentry *root; |
|
char *subvol_name = NULL; |
|
u64 subvol_objectid = 0; |
|
int error = 0; |
|
|
|
error = btrfs_parse_subvol_options(data, &subvol_name, |
|
&subvol_objectid); |
|
if (error) { |
|
kfree(subvol_name); |
|
return ERR_PTR(error); |
|
} |
|
|
|
/* mount device's root (/) */ |
|
mnt_root = vfs_kern_mount(&btrfs_root_fs_type, flags, device_name, data); |
|
if (PTR_ERR_OR_ZERO(mnt_root) == -EBUSY) { |
|
if (flags & SB_RDONLY) { |
|
mnt_root = vfs_kern_mount(&btrfs_root_fs_type, |
|
flags & ~SB_RDONLY, device_name, data); |
|
} else { |
|
mnt_root = vfs_kern_mount(&btrfs_root_fs_type, |
|
flags | SB_RDONLY, device_name, data); |
|
if (IS_ERR(mnt_root)) { |
|
root = ERR_CAST(mnt_root); |
|
kfree(subvol_name); |
|
goto out; |
|
} |
|
|
|
down_write(&mnt_root->mnt_sb->s_umount); |
|
error = btrfs_remount(mnt_root->mnt_sb, &flags, NULL); |
|
up_write(&mnt_root->mnt_sb->s_umount); |
|
if (error < 0) { |
|
root = ERR_PTR(error); |
|
mntput(mnt_root); |
|
kfree(subvol_name); |
|
goto out; |
|
} |
|
} |
|
} |
|
if (IS_ERR(mnt_root)) { |
|
root = ERR_CAST(mnt_root); |
|
kfree(subvol_name); |
|
goto out; |
|
} |
|
|
|
/* mount_subvol() will free subvol_name and mnt_root */ |
|
root = mount_subvol(subvol_name, subvol_objectid, mnt_root); |
|
|
|
out: |
|
return root; |
|
} |
|
|
|
static void btrfs_resize_thread_pool(struct btrfs_fs_info *fs_info, |
|
u32 new_pool_size, u32 old_pool_size) |
|
{ |
|
if (new_pool_size == old_pool_size) |
|
return; |
|
|
|
fs_info->thread_pool_size = new_pool_size; |
|
|
|
btrfs_info(fs_info, "resize thread pool %d -> %d", |
|
old_pool_size, new_pool_size); |
|
|
|
btrfs_workqueue_set_max(fs_info->workers, new_pool_size); |
|
btrfs_workqueue_set_max(fs_info->delalloc_workers, new_pool_size); |
|
btrfs_workqueue_set_max(fs_info->caching_workers, new_pool_size); |
|
btrfs_workqueue_set_max(fs_info->endio_workers, new_pool_size); |
|
btrfs_workqueue_set_max(fs_info->endio_meta_workers, new_pool_size); |
|
btrfs_workqueue_set_max(fs_info->endio_meta_write_workers, |
|
new_pool_size); |
|
btrfs_workqueue_set_max(fs_info->endio_write_workers, new_pool_size); |
|
btrfs_workqueue_set_max(fs_info->endio_freespace_worker, new_pool_size); |
|
btrfs_workqueue_set_max(fs_info->delayed_workers, new_pool_size); |
|
btrfs_workqueue_set_max(fs_info->readahead_workers, new_pool_size); |
|
btrfs_workqueue_set_max(fs_info->scrub_wr_completion_workers, |
|
new_pool_size); |
|
} |
|
|
|
static inline void btrfs_remount_begin(struct btrfs_fs_info *fs_info, |
|
unsigned long old_opts, int flags) |
|
{ |
|
if (btrfs_raw_test_opt(old_opts, AUTO_DEFRAG) && |
|
(!btrfs_raw_test_opt(fs_info->mount_opt, AUTO_DEFRAG) || |
|
(flags & SB_RDONLY))) { |
|
/* wait for any defraggers to finish */ |
|
wait_event(fs_info->transaction_wait, |
|
(atomic_read(&fs_info->defrag_running) == 0)); |
|
if (flags & SB_RDONLY) |
|
sync_filesystem(fs_info->sb); |
|
} |
|
} |
|
|
|
static inline void btrfs_remount_cleanup(struct btrfs_fs_info *fs_info, |
|
unsigned long old_opts) |
|
{ |
|
const bool cache_opt = btrfs_test_opt(fs_info, SPACE_CACHE); |
|
|
|
/* |
|
* We need to cleanup all defragable inodes if the autodefragment is |
|
* close or the filesystem is read only. |
|
*/ |
|
if (btrfs_raw_test_opt(old_opts, AUTO_DEFRAG) && |
|
(!btrfs_raw_test_opt(fs_info->mount_opt, AUTO_DEFRAG) || sb_rdonly(fs_info->sb))) { |
|
btrfs_cleanup_defrag_inodes(fs_info); |
|
} |
|
|
|
/* If we toggled discard async */ |
|
if (!btrfs_raw_test_opt(old_opts, DISCARD_ASYNC) && |
|
btrfs_test_opt(fs_info, DISCARD_ASYNC)) |
|
btrfs_discard_resume(fs_info); |
|
else if (btrfs_raw_test_opt(old_opts, DISCARD_ASYNC) && |
|
!btrfs_test_opt(fs_info, DISCARD_ASYNC)) |
|
btrfs_discard_cleanup(fs_info); |
|
|
|
/* If we toggled space cache */ |
|
if (cache_opt != btrfs_free_space_cache_v1_active(fs_info)) |
|
btrfs_set_free_space_cache_v1_active(fs_info, cache_opt); |
|
} |
|
|
|
static int btrfs_remount(struct super_block *sb, int *flags, char *data) |
|
{ |
|
struct btrfs_fs_info *fs_info = btrfs_sb(sb); |
|
unsigned old_flags = sb->s_flags; |
|
unsigned long old_opts = fs_info->mount_opt; |
|
unsigned long old_compress_type = fs_info->compress_type; |
|
u64 old_max_inline = fs_info->max_inline; |
|
u32 old_thread_pool_size = fs_info->thread_pool_size; |
|
u32 old_metadata_ratio = fs_info->metadata_ratio; |
|
int ret; |
|
|
|
sync_filesystem(sb); |
|
set_bit(BTRFS_FS_STATE_REMOUNTING, &fs_info->fs_state); |
|
|
|
if (data) { |
|
void *new_sec_opts = NULL; |
|
|
|
ret = security_sb_eat_lsm_opts(data, &new_sec_opts); |
|
if (!ret) |
|
ret = security_sb_remount(sb, new_sec_opts); |
|
security_free_mnt_opts(&new_sec_opts); |
|
if (ret) |
|
goto restore; |
|
} |
|
|
|
ret = btrfs_parse_options(fs_info, data, *flags); |
|
if (ret) |
|
goto restore; |
|
|
|
btrfs_remount_begin(fs_info, old_opts, *flags); |
|
btrfs_resize_thread_pool(fs_info, |
|
fs_info->thread_pool_size, old_thread_pool_size); |
|
|
|
if ((bool)btrfs_test_opt(fs_info, FREE_SPACE_TREE) != |
|
(bool)btrfs_fs_compat_ro(fs_info, FREE_SPACE_TREE) && |
|
(!sb_rdonly(sb) || (*flags & SB_RDONLY))) { |
|
btrfs_warn(fs_info, |
|
"remount supports changing free space tree only from ro to rw"); |
|
/* Make sure free space cache options match the state on disk */ |
|
if (btrfs_fs_compat_ro(fs_info, FREE_SPACE_TREE)) { |
|
btrfs_set_opt(fs_info->mount_opt, FREE_SPACE_TREE); |
|
btrfs_clear_opt(fs_info->mount_opt, SPACE_CACHE); |
|
} |
|
if (btrfs_free_space_cache_v1_active(fs_info)) { |
|
btrfs_clear_opt(fs_info->mount_opt, FREE_SPACE_TREE); |
|
btrfs_set_opt(fs_info->mount_opt, SPACE_CACHE); |
|
} |
|
} |
|
|
|
if ((bool)(*flags & SB_RDONLY) == sb_rdonly(sb)) |
|
goto out; |
|
|
|
if (*flags & SB_RDONLY) { |
|
/* |
|
* this also happens on 'umount -rf' or on shutdown, when |
|
* the filesystem is busy. |
|
*/ |
|
cancel_work_sync(&fs_info->async_reclaim_work); |
|
cancel_work_sync(&fs_info->async_data_reclaim_work); |
|
|
|
btrfs_discard_cleanup(fs_info); |
|
|
|
/* wait for the uuid_scan task to finish */ |
|
down(&fs_info->uuid_tree_rescan_sem); |
|
/* avoid complains from lockdep et al. */ |
|
up(&fs_info->uuid_tree_rescan_sem); |
|
|
|
btrfs_set_sb_rdonly(sb); |
|
|
|
/* |
|
* Setting SB_RDONLY will put the cleaner thread to |
|
* sleep at the next loop if it's already active. |
|
* If it's already asleep, we'll leave unused block |
|
* groups on disk until we're mounted read-write again |
|
* unless we clean them up here. |
|
*/ |
|
btrfs_delete_unused_bgs(fs_info); |
|
|
|
/* |
|
* The cleaner task could be already running before we set the |
|
* flag BTRFS_FS_STATE_RO (and SB_RDONLY in the superblock). |
|
* We must make sure that after we finish the remount, i.e. after |
|
* we call btrfs_commit_super(), the cleaner can no longer start |
|
* a transaction - either because it was dropping a dead root, |
|
* running delayed iputs or deleting an unused block group (the |
|
* cleaner picked a block group from the list of unused block |
|
* groups before we were able to in the previous call to |
|
* btrfs_delete_unused_bgs()). |
|
*/ |
|
wait_on_bit(&fs_info->flags, BTRFS_FS_CLEANER_RUNNING, |
|
TASK_UNINTERRUPTIBLE); |
|
|
|
/* |
|
* We've set the superblock to RO mode, so we might have made |
|
* the cleaner task sleep without running all pending delayed |
|
* iputs. Go through all the delayed iputs here, so that if an |
|
* unmount happens without remounting RW we don't end up at |
|
* finishing close_ctree() with a non-empty list of delayed |
|
* iputs. |
|
*/ |
|
btrfs_run_delayed_iputs(fs_info); |
|
|
|
btrfs_dev_replace_suspend_for_unmount(fs_info); |
|
btrfs_scrub_cancel(fs_info); |
|
btrfs_pause_balance(fs_info); |
|
|
|
/* |
|
* Pause the qgroup rescan worker if it is running. We don't want |
|
* it to be still running after we are in RO mode, as after that, |
|
* by the time we unmount, it might have left a transaction open, |
|
* so we would leak the transaction and/or crash. |
|
*/ |
|
btrfs_qgroup_wait_for_completion(fs_info, false); |
|
|
|
ret = btrfs_commit_super(fs_info); |
|
if (ret) |
|
goto restore; |
|
} else { |
|
if (test_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state)) { |
|
btrfs_err(fs_info, |
|
"Remounting read-write after error is not allowed"); |
|
ret = -EINVAL; |
|
goto restore; |
|
} |
|
if (fs_info->fs_devices->rw_devices == 0) { |
|
ret = -EACCES; |
|
goto restore; |
|
} |
|
|
|
if (!btrfs_check_rw_degradable(fs_info, NULL)) { |
|
btrfs_warn(fs_info, |
|
"too many missing devices, writable remount is not allowed"); |
|
ret = -EACCES; |
|
goto restore; |
|
} |
|
|
|
if (btrfs_super_log_root(fs_info->super_copy) != 0) { |
|
btrfs_warn(fs_info, |
|
"mount required to replay tree-log, cannot remount read-write"); |
|
ret = -EINVAL; |
|
goto restore; |
|
} |
|
if (fs_info->sectorsize < PAGE_SIZE) { |
|
btrfs_warn(fs_info, |
|
"read-write mount is not yet allowed for sectorsize %u page size %lu", |
|
fs_info->sectorsize, PAGE_SIZE); |
|
ret = -EINVAL; |
|
goto restore; |
|
} |
|
|
|
/* |
|
* NOTE: when remounting with a change that does writes, don't |
|
* put it anywhere above this point, as we are not sure to be |
|
* safe to write until we pass the above checks. |
|
*/ |
|
ret = btrfs_start_pre_rw_mount(fs_info); |
|
if (ret) |
|
goto restore; |
|
|
|
btrfs_clear_sb_rdonly(sb); |
|
|
|
set_bit(BTRFS_FS_OPEN, &fs_info->flags); |
|
} |
|
out: |
|
/* |
|
* We need to set SB_I_VERSION here otherwise it'll get cleared by VFS, |
|
* since the absence of the flag means it can be toggled off by remount. |
|
*/ |
|
*flags |= SB_I_VERSION; |
|
|
|
wake_up_process(fs_info->transaction_kthread); |
|
btrfs_remount_cleanup(fs_info, old_opts); |
|
btrfs_clear_oneshot_options(fs_info); |
|
clear_bit(BTRFS_FS_STATE_REMOUNTING, &fs_info->fs_state); |
|
|
|
return 0; |
|
|
|
restore: |
|
/* We've hit an error - don't reset SB_RDONLY */ |
|
if (sb_rdonly(sb)) |
|
old_flags |= SB_RDONLY; |
|
if (!(old_flags & SB_RDONLY)) |
|
clear_bit(BTRFS_FS_STATE_RO, &fs_info->fs_state); |
|
sb->s_flags = old_flags; |
|
fs_info->mount_opt = old_opts; |
|
fs_info->compress_type = old_compress_type; |
|
fs_info->max_inline = old_max_inline; |
|
btrfs_resize_thread_pool(fs_info, |
|
old_thread_pool_size, fs_info->thread_pool_size); |
|
fs_info->metadata_ratio = old_metadata_ratio; |
|
btrfs_remount_cleanup(fs_info, old_opts); |
|
clear_bit(BTRFS_FS_STATE_REMOUNTING, &fs_info->fs_state); |
|
|
|
return ret; |
|
} |
|
|
|
/* Used to sort the devices by max_avail(descending sort) */ |
|
static inline int btrfs_cmp_device_free_bytes(const void *dev_info1, |
|
const void *dev_info2) |
|
{ |
|
if (((struct btrfs_device_info *)dev_info1)->max_avail > |
|
((struct btrfs_device_info *)dev_info2)->max_avail) |
|
return -1; |
|
else if (((struct btrfs_device_info *)dev_info1)->max_avail < |
|
((struct btrfs_device_info *)dev_info2)->max_avail) |
|
return 1; |
|
else |
|
return 0; |
|
} |
|
|
|
/* |
|
* sort the devices by max_avail, in which max free extent size of each device |
|
* is stored.(Descending Sort) |
|
*/ |
|
static inline void btrfs_descending_sort_devices( |
|
struct btrfs_device_info *devices, |
|
size_t nr_devices) |
|
{ |
|
sort(devices, nr_devices, sizeof(struct btrfs_device_info), |
|
btrfs_cmp_device_free_bytes, NULL); |
|
} |
|
|
|
/* |
|
* The helper to calc the free space on the devices that can be used to store |
|
* file data. |
|
*/ |
|
static inline int btrfs_calc_avail_data_space(struct btrfs_fs_info *fs_info, |
|
u64 *free_bytes) |
|
{ |
|
struct btrfs_device_info *devices_info; |
|
struct btrfs_fs_devices *fs_devices = fs_info->fs_devices; |
|
struct btrfs_device *device; |
|
u64 type; |
|
u64 avail_space; |
|
u64 min_stripe_size; |
|
int num_stripes = 1; |
|
int i = 0, nr_devices; |
|
const struct btrfs_raid_attr *rattr; |
|
|
|
/* |
|
* We aren't under the device list lock, so this is racy-ish, but good |
|
* enough for our purposes. |
|
*/ |
|
nr_devices = fs_info->fs_devices->open_devices; |
|
if (!nr_devices) { |
|
smp_mb(); |
|
nr_devices = fs_info->fs_devices->open_devices; |
|
ASSERT(nr_devices); |
|
if (!nr_devices) { |
|
*free_bytes = 0; |
|
return 0; |
|
} |
|
} |
|
|
|
devices_info = kmalloc_array(nr_devices, sizeof(*devices_info), |
|
GFP_KERNEL); |
|
if (!devices_info) |
|
return -ENOMEM; |
|
|
|
/* calc min stripe number for data space allocation */ |
|
type = btrfs_data_alloc_profile(fs_info); |
|
rattr = &btrfs_raid_array[btrfs_bg_flags_to_raid_index(type)]; |
|
|
|
if (type & BTRFS_BLOCK_GROUP_RAID0) |
|
num_stripes = nr_devices; |
|
else if (type & BTRFS_BLOCK_GROUP_RAID1) |
|
num_stripes = 2; |
|
else if (type & BTRFS_BLOCK_GROUP_RAID1C3) |
|
num_stripes = 3; |
|
else if (type & BTRFS_BLOCK_GROUP_RAID1C4) |
|
num_stripes = 4; |
|
else if (type & BTRFS_BLOCK_GROUP_RAID10) |
|
num_stripes = 4; |
|
|
|
/* Adjust for more than 1 stripe per device */ |
|
min_stripe_size = rattr->dev_stripes * BTRFS_STRIPE_LEN; |
|
|
|
rcu_read_lock(); |
|
list_for_each_entry_rcu(device, &fs_devices->devices, dev_list) { |
|
if (!test_bit(BTRFS_DEV_STATE_IN_FS_METADATA, |
|
&device->dev_state) || |
|
!device->bdev || |
|
test_bit(BTRFS_DEV_STATE_REPLACE_TGT, &device->dev_state)) |
|
continue; |
|
|
|
if (i >= nr_devices) |
|
break; |
|
|
|
avail_space = device->total_bytes - device->bytes_used; |
|
|
|
/* align with stripe_len */ |
|
avail_space = rounddown(avail_space, BTRFS_STRIPE_LEN); |
|
|
|
/* |
|
* In order to avoid overwriting the superblock on the drive, |
|
* btrfs starts at an offset of at least 1MB when doing chunk |
|
* allocation. |
|
* |
|
* This ensures we have at least min_stripe_size free space |
|
* after excluding 1MB. |
|
*/ |
|
if (avail_space <= SZ_1M + min_stripe_size) |
|
continue; |
|
|
|
avail_space -= SZ_1M; |
|
|
|
devices_info[i].dev = device; |
|
devices_info[i].max_avail = avail_space; |
|
|
|
i++; |
|
} |
|
rcu_read_unlock(); |
|
|
|
nr_devices = i; |
|
|
|
btrfs_descending_sort_devices(devices_info, nr_devices); |
|
|
|
i = nr_devices - 1; |
|
avail_space = 0; |
|
while (nr_devices >= rattr->devs_min) { |
|
num_stripes = min(num_stripes, nr_devices); |
|
|
|
if (devices_info[i].max_avail >= min_stripe_size) { |
|
int j; |
|
u64 alloc_size; |
|
|
|
avail_space += devices_info[i].max_avail * num_stripes; |
|
alloc_size = devices_info[i].max_avail; |
|
for (j = i + 1 - num_stripes; j <= i; j++) |
|
devices_info[j].max_avail -= alloc_size; |
|
} |
|
i--; |
|
nr_devices--; |
|
} |
|
|
|
kfree(devices_info); |
|
*free_bytes = avail_space; |
|
return 0; |
|
} |
|
|
|
/* |
|
* Calculate numbers for 'df', pessimistic in case of mixed raid profiles. |
|
* |
|
* If there's a redundant raid level at DATA block groups, use the respective |
|
* multiplier to scale the sizes. |
|
* |
|
* Unused device space usage is based on simulating the chunk allocator |
|
* algorithm that respects the device sizes and order of allocations. This is |
|
* a close approximation of the actual use but there are other factors that may |
|
* change the result (like a new metadata chunk). |
|
* |
|
* If metadata is exhausted, f_bavail will be 0. |
|
*/ |
|
static int btrfs_statfs(struct dentry *dentry, struct kstatfs *buf) |
|
{ |
|
struct btrfs_fs_info *fs_info = btrfs_sb(dentry->d_sb); |
|
struct btrfs_super_block *disk_super = fs_info->super_copy; |
|
struct btrfs_space_info *found; |
|
u64 total_used = 0; |
|
u64 total_free_data = 0; |
|
u64 total_free_meta = 0; |
|
u32 bits = fs_info->sectorsize_bits; |
|
__be32 *fsid = (__be32 *)fs_info->fs_devices->fsid; |
|
unsigned factor = 1; |
|
struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv; |
|
int ret; |
|
u64 thresh = 0; |
|
int mixed = 0; |
|
|
|
list_for_each_entry(found, &fs_info->space_info, list) { |
|
if (found->flags & BTRFS_BLOCK_GROUP_DATA) { |
|
int i; |
|
|
|
total_free_data += found->disk_total - found->disk_used; |
|
total_free_data -= |
|
btrfs_account_ro_block_groups_free_space(found); |
|
|
|
for (i = 0; i < BTRFS_NR_RAID_TYPES; i++) { |
|
if (!list_empty(&found->block_groups[i])) |
|
factor = btrfs_bg_type_to_factor( |
|
btrfs_raid_array[i].bg_flag); |
|
} |
|
} |
|
|
|
/* |
|
* Metadata in mixed block goup profiles are accounted in data |
|
*/ |
|
if (!mixed && found->flags & BTRFS_BLOCK_GROUP_METADATA) { |
|
if (found->flags & BTRFS_BLOCK_GROUP_DATA) |
|
mixed = 1; |
|
else |
|
total_free_meta += found->disk_total - |
|
found->disk_used; |
|
} |
|
|
|
total_used += found->disk_used; |
|
} |
|
|
|
buf->f_blocks = div_u64(btrfs_super_total_bytes(disk_super), factor); |
|
buf->f_blocks >>= bits; |
|
buf->f_bfree = buf->f_blocks - (div_u64(total_used, factor) >> bits); |
|
|
|
/* Account global block reserve as used, it's in logical size already */ |
|
spin_lock(&block_rsv->lock); |
|
/* Mixed block groups accounting is not byte-accurate, avoid overflow */ |
|
if (buf->f_bfree >= block_rsv->size >> bits) |
|
buf->f_bfree -= block_rsv->size >> bits; |
|
else |
|
buf->f_bfree = 0; |
|
spin_unlock(&block_rsv->lock); |
|
|
|
buf->f_bavail = div_u64(total_free_data, factor); |
|
ret = btrfs_calc_avail_data_space(fs_info, &total_free_data); |
|
if (ret) |
|
return ret; |
|
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 = SZ_4M; |
|
|
|
/* |
|
* We only want to claim there's no available space if we can no longer |
|
* allocate chunks for our metadata profile and our global reserve will |
|
* not fit in the free metadata space. If we aren't ->full then we |
|
* still can allocate chunks and thus are fine using the currently |
|
* calculated f_bavail. |
|
*/ |
|
if (!mixed && block_rsv->space_info->full && |
|
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; |
|
|
|
/* We treat it as constant endianness (it doesn't matter _which_) |
|
because we want the fsid to come out the same whether mounted |
|
on a big-endian or little-endian host */ |
|
buf->f_fsid.val[0] = be32_to_cpu(fsid[0]) ^ be32_to_cpu(fsid[2]); |
|
buf->f_fsid.val[1] = be32_to_cpu(fsid[1]) ^ be32_to_cpu(fsid[3]); |
|
/* Mask in the root object ID too, to disambiguate subvols */ |
|
buf->f_fsid.val[0] ^= |
|
BTRFS_I(d_inode(dentry))->root->root_key.objectid >> 32; |
|
buf->f_fsid.val[1] ^= |
|
BTRFS_I(d_inode(dentry))->root->root_key.objectid; |
|
|
|
return 0; |
|
} |
|
|
|
static void btrfs_kill_super(struct super_block *sb) |
|
{ |
|
struct btrfs_fs_info *fs_info = btrfs_sb(sb); |
|
kill_anon_super(sb); |
|
btrfs_free_fs_info(fs_info); |
|
} |
|
|
|
static struct file_system_type btrfs_fs_type = { |
|
.owner = THIS_MODULE, |
|
.name = "btrfs", |
|
.mount = btrfs_mount, |
|
.kill_sb = btrfs_kill_super, |
|
.fs_flags = FS_REQUIRES_DEV | FS_BINARY_MOUNTDATA, |
|
}; |
|
|
|
static struct file_system_type btrfs_root_fs_type = { |
|
.owner = THIS_MODULE, |
|
.name = "btrfs", |
|
.mount = btrfs_mount_root, |
|
.kill_sb = btrfs_kill_super, |
|
.fs_flags = FS_REQUIRES_DEV | FS_BINARY_MOUNTDATA, |
|
}; |
|
|
|
MODULE_ALIAS_FS("btrfs"); |
|
|
|
static int btrfs_control_open(struct inode *inode, struct file *file) |
|
{ |
|
/* |
|
* The control file's private_data is used to hold the |
|
* transaction when it is started and is used to keep |
|
* track of whether a transaction is already in progress. |
|
*/ |
|
file->private_data = NULL; |
|
return 0; |
|
} |
|
|
|
/* |
|
* Used by /dev/btrfs-control for devices ioctls. |
|
*/ |
|
static long btrfs_control_ioctl(struct file *file, unsigned int cmd, |
|
unsigned long arg) |
|
{ |
|
struct btrfs_ioctl_vol_args *vol; |
|
struct btrfs_device *device = NULL; |
|
int ret = -ENOTTY; |
|
|
|
if (!capable(CAP_SYS_ADMIN)) |
|
return -EPERM; |
|
|
|
vol = memdup_user((void __user *)arg, sizeof(*vol)); |
|
if (IS_ERR(vol)) |
|
return PTR_ERR(vol); |
|
vol->name[BTRFS_PATH_NAME_MAX] = '\0'; |
|
|
|
switch (cmd) { |
|
case BTRFS_IOC_SCAN_DEV: |
|
mutex_lock(&uuid_mutex); |
|
device = btrfs_scan_one_device(vol->name, FMODE_READ, |
|
&btrfs_root_fs_type); |
|
ret = PTR_ERR_OR_ZERO(device); |
|
mutex_unlock(&uuid_mutex); |
|
break; |
|
case BTRFS_IOC_FORGET_DEV: |
|
ret = btrfs_forget_devices(vol->name); |
|
break; |
|
case BTRFS_IOC_DEVICES_READY: |
|
mutex_lock(&uuid_mutex); |
|
device = btrfs_scan_one_device(vol->name, FMODE_READ, |
|
&btrfs_root_fs_type); |
|
if (IS_ERR(device)) { |
|
mutex_unlock(&uuid_mutex); |
|
ret = PTR_ERR(device); |
|
break; |
|
} |
|
ret = !(device->fs_devices->num_devices == |
|
device->fs_devices->total_devices); |
|
mutex_unlock(&uuid_mutex); |
|
break; |
|
case BTRFS_IOC_GET_SUPPORTED_FEATURES: |
|
ret = btrfs_ioctl_get_supported_features((void __user*)arg); |
|
break; |
|
} |
|
|
|
kfree(vol); |
|
return ret; |
|
} |
|
|
|
static int btrfs_freeze(struct super_block *sb) |
|
{ |
|
struct btrfs_trans_handle *trans; |
|
struct btrfs_fs_info *fs_info = btrfs_sb(sb); |
|
struct btrfs_root *root = fs_info->tree_root; |
|
|
|
set_bit(BTRFS_FS_FROZEN, &fs_info->flags); |
|
/* |
|
* We don't need a barrier here, we'll wait for any transaction that |
|
* could be in progress on other threads (and do delayed iputs that |
|
* we want to avoid on a frozen filesystem), or do the commit |
|
* ourselves. |
|
*/ |
|
trans = btrfs_attach_transaction_barrier(root); |
|
if (IS_ERR(trans)) { |
|
/* no transaction, don't bother */ |
|
if (PTR_ERR(trans) == -ENOENT) |
|
return 0; |
|
return PTR_ERR(trans); |
|
} |
|
return btrfs_commit_transaction(trans); |
|
} |
|
|
|
static int btrfs_unfreeze(struct super_block *sb) |
|
{ |
|
struct btrfs_fs_info *fs_info = btrfs_sb(sb); |
|
|
|
clear_bit(BTRFS_FS_FROZEN, &fs_info->flags); |
|
return 0; |
|
} |
|
|
|
static int btrfs_show_devname(struct seq_file *m, struct dentry *root) |
|
{ |
|
struct btrfs_fs_info *fs_info = btrfs_sb(root->d_sb); |
|
struct btrfs_device *dev, *first_dev = NULL; |
|
|
|
/* |
|
* Lightweight locking of the devices. We should not need |
|
* device_list_mutex here as we only read the device data and the list |
|
* is protected by RCU. Even if a device is deleted during the list |
|
* traversals, we'll get valid data, the freeing callback will wait at |
|
* least until the rcu_read_unlock. |
|
*/ |
|
rcu_read_lock(); |
|
list_for_each_entry_rcu(dev, &fs_info->fs_devices->devices, dev_list) { |
|
if (test_bit(BTRFS_DEV_STATE_MISSING, &dev->dev_state)) |
|
continue; |
|
if (!dev->name) |
|
continue; |
|
if (!first_dev || dev->devid < first_dev->devid) |
|
first_dev = dev; |
|
} |
|
|
|
if (first_dev) |
|
seq_escape(m, rcu_str_deref(first_dev->name), " \t\n\\"); |
|
else |
|
WARN_ON(1); |
|
rcu_read_unlock(); |
|
return 0; |
|
} |
|
|
|
static const struct super_operations btrfs_super_ops = { |
|
.drop_inode = btrfs_drop_inode, |
|
.evict_inode = btrfs_evict_inode, |
|
.put_super = btrfs_put_super, |
|
.sync_fs = btrfs_sync_fs, |
|
.show_options = btrfs_show_options, |
|
.show_devname = btrfs_show_devname, |
|
.alloc_inode = btrfs_alloc_inode, |
|
.destroy_inode = btrfs_destroy_inode, |
|
.free_inode = btrfs_free_inode, |
|
.statfs = btrfs_statfs, |
|
.remount_fs = btrfs_remount, |
|
.freeze_fs = btrfs_freeze, |
|
.unfreeze_fs = btrfs_unfreeze, |
|
}; |
|
|
|
static const struct file_operations btrfs_ctl_fops = { |
|
.open = btrfs_control_open, |
|
.unlocked_ioctl = btrfs_control_ioctl, |
|
.compat_ioctl = compat_ptr_ioctl, |
|
.owner = THIS_MODULE, |
|
.llseek = noop_llseek, |
|
}; |
|
|
|
static struct miscdevice btrfs_misc = { |
|
.minor = BTRFS_MINOR, |
|
.name = "btrfs-control", |
|
.fops = &btrfs_ctl_fops |
|
}; |
|
|
|
MODULE_ALIAS_MISCDEV(BTRFS_MINOR); |
|
MODULE_ALIAS("devname:btrfs-control"); |
|
|
|
static int __init btrfs_interface_init(void) |
|
{ |
|
return misc_register(&btrfs_misc); |
|
} |
|
|
|
static __cold void btrfs_interface_exit(void) |
|
{ |
|
misc_deregister(&btrfs_misc); |
|
} |
|
|
|
static void __init btrfs_print_mod_info(void) |
|
{ |
|
static const char options[] = "" |
|
#ifdef CONFIG_BTRFS_DEBUG |
|
", debug=on" |
|
#endif |
|
#ifdef CONFIG_BTRFS_ASSERT |
|
", assert=on" |
|
#endif |
|
#ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY |
|
", integrity-checker=on" |
|
#endif |
|
#ifdef CONFIG_BTRFS_FS_REF_VERIFY |
|
", ref-verify=on" |
|
#endif |
|
#ifdef CONFIG_BLK_DEV_ZONED |
|
", zoned=yes" |
|
#else |
|
", zoned=no" |
|
#endif |
|
; |
|
pr_info("Btrfs loaded, crc32c=%s%s\n", crc32c_impl(), options); |
|
} |
|
|
|
static int __init init_btrfs_fs(void) |
|
{ |
|
int err; |
|
|
|
btrfs_props_init(); |
|
|
|
err = btrfs_init_sysfs(); |
|
if (err) |
|
return err; |
|
|
|
btrfs_init_compress(); |
|
|
|
err = btrfs_init_cachep(); |
|
if (err) |
|
goto free_compress; |
|
|
|
err = extent_io_init(); |
|
if (err) |
|
goto free_cachep; |
|
|
|
err = extent_state_cache_init(); |
|
if (err) |
|
goto free_extent_io; |
|
|
|
err = extent_map_init(); |
|
if (err) |
|
goto free_extent_state_cache; |
|
|
|
err = ordered_data_init(); |
|
if (err) |
|
goto free_extent_map; |
|
|
|
err = btrfs_delayed_inode_init(); |
|
if (err) |
|
goto free_ordered_data; |
|
|
|
err = btrfs_auto_defrag_init(); |
|
if (err) |
|
goto free_delayed_inode; |
|
|
|
err = btrfs_delayed_ref_init(); |
|
if (err) |
|
goto free_auto_defrag; |
|
|
|
err = btrfs_prelim_ref_init(); |
|
if (err) |
|
goto free_delayed_ref; |
|
|
|
err = btrfs_end_io_wq_init(); |
|
if (err) |
|
goto free_prelim_ref; |
|
|
|
err = btrfs_interface_init(); |
|
if (err) |
|
goto free_end_io_wq; |
|
|
|
btrfs_print_mod_info(); |
|
|
|
err = btrfs_run_sanity_tests(); |
|
if (err) |
|
goto unregister_ioctl; |
|
|
|
err = register_filesystem(&btrfs_fs_type); |
|
if (err) |
|
goto unregister_ioctl; |
|
|
|
return 0; |
|
|
|
unregister_ioctl: |
|
btrfs_interface_exit(); |
|
free_end_io_wq: |
|
btrfs_end_io_wq_exit(); |
|
free_prelim_ref: |
|
btrfs_prelim_ref_exit(); |
|
free_delayed_ref: |
|
btrfs_delayed_ref_exit(); |
|
free_auto_defrag: |
|
btrfs_auto_defrag_exit(); |
|
free_delayed_inode: |
|
btrfs_delayed_inode_exit(); |
|
free_ordered_data: |
|
ordered_data_exit(); |
|
free_extent_map: |
|
extent_map_exit(); |
|
free_extent_state_cache: |
|
extent_state_cache_exit(); |
|
free_extent_io: |
|
extent_io_exit(); |
|
free_cachep: |
|
btrfs_destroy_cachep(); |
|
free_compress: |
|
btrfs_exit_compress(); |
|
btrfs_exit_sysfs(); |
|
|
|
return err; |
|
} |
|
|
|
static void __exit exit_btrfs_fs(void) |
|
{ |
|
btrfs_destroy_cachep(); |
|
btrfs_delayed_ref_exit(); |
|
btrfs_auto_defrag_exit(); |
|
btrfs_delayed_inode_exit(); |
|
btrfs_prelim_ref_exit(); |
|
ordered_data_exit(); |
|
extent_map_exit(); |
|
extent_state_cache_exit(); |
|
extent_io_exit(); |
|
btrfs_interface_exit(); |
|
btrfs_end_io_wq_exit(); |
|
unregister_filesystem(&btrfs_fs_type); |
|
btrfs_exit_sysfs(); |
|
btrfs_cleanup_fs_uuids(); |
|
btrfs_exit_compress(); |
|
} |
|
|
|
late_initcall(init_btrfs_fs); |
|
module_exit(exit_btrfs_fs) |
|
|
|
MODULE_LICENSE("GPL"); |
|
MODULE_SOFTDEP("pre: crc32c"); |
|
MODULE_SOFTDEP("pre: xxhash64"); |
|
MODULE_SOFTDEP("pre: sha256"); |
|
MODULE_SOFTDEP("pre: blake2b-256");
|
|
|