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ext4: support GETFSMAP ioctls
Support the GETFSMAP ioctls so that we can use the xfs free space management tools to probe ext4 as well. Note that this is a partial implementation -- we only report fixed-location metadata and free space; everything else is reported as "unknown". Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Signed-off-by: Theodore Ts'o <tytso@mit.edu>
This commit is contained in:
parent
d0649f0416
commit
0c9ec4beec
8 changed files with 1027 additions and 5 deletions
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@ -4,11 +4,11 @@
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obj-$(CONFIG_EXT4_FS) += ext4.o
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ext4-y := balloc.o bitmap.o dir.o file.o fsync.o ialloc.o inode.o page-io.o \
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ioctl.o namei.o super.o symlink.o hash.o resize.o extents.o \
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ext4_jbd2.o migrate.o mballoc.o block_validity.o move_extent.o \
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mmp.o indirect.o extents_status.o xattr.o xattr_user.o \
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xattr_trusted.o inline.o readpage.o sysfs.o
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ext4-y := balloc.o bitmap.o block_validity.o dir.o ext4_jbd2.o extents.o \
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extents_status.o file.o fsmap.o fsync.o hash.o ialloc.o \
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indirect.o inline.o inode.o ioctl.o mballoc.o migrate.o \
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mmp.o move_extent.o namei.o page-io.o readpage.o resize.o \
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super.o symlink.o sysfs.o xattr.o xattr_trusted.o xattr_user.o
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ext4-$(CONFIG_EXT4_FS_POSIX_ACL) += acl.o
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ext4-$(CONFIG_EXT4_FS_SECURITY) += xattr_security.o
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722
fs/ext4/fsmap.c
Normal file
722
fs/ext4/fsmap.c
Normal file
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@ -0,0 +1,722 @@
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/*
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* Copyright (C) 2017 Oracle. All Rights Reserved.
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*
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* Author: Darrick J. Wong <darrick.wong@oracle.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it would be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#include "ext4.h"
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#include <linux/fsmap.h>
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#include "fsmap.h"
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#include "mballoc.h"
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#include <linux/sort.h>
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#include <linux/list_sort.h>
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#include <trace/events/ext4.h>
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/* Convert an ext4_fsmap to an fsmap. */
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void ext4_fsmap_from_internal(struct super_block *sb, struct fsmap *dest,
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struct ext4_fsmap *src)
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{
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dest->fmr_device = src->fmr_device;
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dest->fmr_flags = src->fmr_flags;
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dest->fmr_physical = src->fmr_physical << sb->s_blocksize_bits;
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dest->fmr_owner = src->fmr_owner;
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dest->fmr_offset = 0;
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dest->fmr_length = src->fmr_length << sb->s_blocksize_bits;
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dest->fmr_reserved[0] = 0;
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dest->fmr_reserved[1] = 0;
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dest->fmr_reserved[2] = 0;
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}
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/* Convert an fsmap to an ext4_fsmap. */
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void ext4_fsmap_to_internal(struct super_block *sb, struct ext4_fsmap *dest,
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struct fsmap *src)
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{
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dest->fmr_device = src->fmr_device;
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dest->fmr_flags = src->fmr_flags;
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dest->fmr_physical = src->fmr_physical >> sb->s_blocksize_bits;
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dest->fmr_owner = src->fmr_owner;
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dest->fmr_length = src->fmr_length >> sb->s_blocksize_bits;
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}
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/* getfsmap query state */
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struct ext4_getfsmap_info {
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struct ext4_fsmap_head *gfi_head;
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ext4_fsmap_format_t gfi_formatter; /* formatting fn */
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void *gfi_format_arg;/* format buffer */
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ext4_fsblk_t gfi_next_fsblk; /* next fsblock we expect */
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u32 gfi_dev; /* device id */
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ext4_group_t gfi_agno; /* bg number, if applicable */
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struct ext4_fsmap gfi_low; /* low rmap key */
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struct ext4_fsmap gfi_high; /* high rmap key */
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struct ext4_fsmap gfi_lastfree; /* free ext at end of last bg */
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struct list_head gfi_meta_list; /* fixed metadata list */
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bool gfi_last; /* last extent? */
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};
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/* Associate a device with a getfsmap handler. */
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struct ext4_getfsmap_dev {
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int (*gfd_fn)(struct super_block *sb,
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struct ext4_fsmap *keys,
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struct ext4_getfsmap_info *info);
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u32 gfd_dev;
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};
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/* Compare two getfsmap device handlers. */
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static int ext4_getfsmap_dev_compare(const void *p1, const void *p2)
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{
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const struct ext4_getfsmap_dev *d1 = p1;
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const struct ext4_getfsmap_dev *d2 = p2;
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return d1->gfd_dev - d2->gfd_dev;
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}
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/* Compare a record against our starting point */
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static bool ext4_getfsmap_rec_before_low_key(struct ext4_getfsmap_info *info,
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struct ext4_fsmap *rec)
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{
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return rec->fmr_physical < info->gfi_low.fmr_physical;
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}
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/*
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* Format a reverse mapping for getfsmap, having translated rm_startblock
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* into the appropriate daddr units.
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*/
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static int ext4_getfsmap_helper(struct super_block *sb,
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struct ext4_getfsmap_info *info,
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struct ext4_fsmap *rec)
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{
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struct ext4_fsmap fmr;
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struct ext4_sb_info *sbi = EXT4_SB(sb);
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ext4_fsblk_t rec_fsblk = rec->fmr_physical;
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ext4_group_t agno;
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ext4_grpblk_t cno;
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int error;
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if (fatal_signal_pending(current))
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return -EINTR;
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/*
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* Filter out records that start before our startpoint, if the
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* caller requested that.
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*/
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if (ext4_getfsmap_rec_before_low_key(info, rec)) {
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rec_fsblk += rec->fmr_length;
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if (info->gfi_next_fsblk < rec_fsblk)
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info->gfi_next_fsblk = rec_fsblk;
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return EXT4_QUERY_RANGE_CONTINUE;
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}
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/* Are we just counting mappings? */
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if (info->gfi_head->fmh_count == 0) {
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if (rec_fsblk > info->gfi_next_fsblk)
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info->gfi_head->fmh_entries++;
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if (info->gfi_last)
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return EXT4_QUERY_RANGE_CONTINUE;
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info->gfi_head->fmh_entries++;
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rec_fsblk += rec->fmr_length;
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if (info->gfi_next_fsblk < rec_fsblk)
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info->gfi_next_fsblk = rec_fsblk;
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return EXT4_QUERY_RANGE_CONTINUE;
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}
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/*
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* If the record starts past the last physical block we saw,
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* then we've found a gap. Report the gap as being owned by
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* whatever the caller specified is the missing owner.
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*/
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if (rec_fsblk > info->gfi_next_fsblk) {
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if (info->gfi_head->fmh_entries >= info->gfi_head->fmh_count)
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return EXT4_QUERY_RANGE_ABORT;
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ext4_get_group_no_and_offset(sb, info->gfi_next_fsblk,
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&agno, &cno);
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trace_ext4_fsmap_mapping(sb, info->gfi_dev, agno,
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EXT4_C2B(sbi, cno),
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rec_fsblk - info->gfi_next_fsblk,
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EXT4_FMR_OWN_UNKNOWN);
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fmr.fmr_device = info->gfi_dev;
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fmr.fmr_physical = info->gfi_next_fsblk;
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fmr.fmr_owner = EXT4_FMR_OWN_UNKNOWN;
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fmr.fmr_length = rec_fsblk - info->gfi_next_fsblk;
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fmr.fmr_flags = FMR_OF_SPECIAL_OWNER;
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error = info->gfi_formatter(&fmr, info->gfi_format_arg);
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if (error)
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return error;
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info->gfi_head->fmh_entries++;
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}
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if (info->gfi_last)
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goto out;
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/* Fill out the extent we found */
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if (info->gfi_head->fmh_entries >= info->gfi_head->fmh_count)
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return EXT4_QUERY_RANGE_ABORT;
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ext4_get_group_no_and_offset(sb, rec_fsblk, &agno, &cno);
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trace_ext4_fsmap_mapping(sb, info->gfi_dev, agno, EXT4_C2B(sbi, cno),
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rec->fmr_length, rec->fmr_owner);
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fmr.fmr_device = info->gfi_dev;
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fmr.fmr_physical = rec_fsblk;
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fmr.fmr_owner = rec->fmr_owner;
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fmr.fmr_flags = FMR_OF_SPECIAL_OWNER;
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fmr.fmr_length = rec->fmr_length;
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error = info->gfi_formatter(&fmr, info->gfi_format_arg);
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if (error)
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return error;
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info->gfi_head->fmh_entries++;
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out:
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rec_fsblk += rec->fmr_length;
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if (info->gfi_next_fsblk < rec_fsblk)
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info->gfi_next_fsblk = rec_fsblk;
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return EXT4_QUERY_RANGE_CONTINUE;
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}
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static inline ext4_fsblk_t ext4_fsmap_next_pblk(struct ext4_fsmap *fmr)
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{
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return fmr->fmr_physical + fmr->fmr_length;
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}
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/* Transform a blockgroup's free record into a fsmap */
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static int ext4_getfsmap_datadev_helper(struct super_block *sb,
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ext4_group_t agno, ext4_grpblk_t start,
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ext4_grpblk_t len, void *priv)
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{
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struct ext4_fsmap irec;
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struct ext4_getfsmap_info *info = priv;
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struct ext4_fsmap *p;
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struct ext4_fsmap *tmp;
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struct ext4_sb_info *sbi = EXT4_SB(sb);
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ext4_fsblk_t fsb;
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ext4_fsblk_t fslen;
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int error;
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fsb = (EXT4_C2B(sbi, start) + ext4_group_first_block_no(sb, agno));
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fslen = EXT4_C2B(sbi, len);
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/* If the retained free extent record is set... */
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if (info->gfi_lastfree.fmr_owner) {
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/* ...and abuts this one, lengthen it and return. */
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if (ext4_fsmap_next_pblk(&info->gfi_lastfree) == fsb) {
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info->gfi_lastfree.fmr_length += fslen;
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return 0;
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}
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/*
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* There's a gap between the two free extents; emit the
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* retained extent prior to merging the meta_list.
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*/
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error = ext4_getfsmap_helper(sb, info, &info->gfi_lastfree);
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if (error)
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return error;
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info->gfi_lastfree.fmr_owner = 0;
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}
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/* Merge in any relevant extents from the meta_list */
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list_for_each_entry_safe(p, tmp, &info->gfi_meta_list, fmr_list) {
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if (p->fmr_physical + p->fmr_length <= info->gfi_next_fsblk) {
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list_del(&p->fmr_list);
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kfree(p);
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} else if (p->fmr_physical < fsb) {
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error = ext4_getfsmap_helper(sb, info, p);
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if (error)
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return error;
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list_del(&p->fmr_list);
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kfree(p);
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}
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}
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irec.fmr_device = 0;
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irec.fmr_physical = fsb;
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irec.fmr_length = fslen;
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irec.fmr_owner = EXT4_FMR_OWN_FREE;
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irec.fmr_flags = 0;
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/* If this is a free extent at the end of a bg, buffer it. */
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if (ext4_fsmap_next_pblk(&irec) ==
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ext4_group_first_block_no(sb, agno + 1)) {
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info->gfi_lastfree = irec;
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return 0;
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}
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/* Otherwise, emit it */
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return ext4_getfsmap_helper(sb, info, &irec);
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}
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/* Execute a getfsmap query against the log device. */
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static int ext4_getfsmap_logdev(struct super_block *sb, struct ext4_fsmap *keys,
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struct ext4_getfsmap_info *info)
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{
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journal_t *journal = EXT4_SB(sb)->s_journal;
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struct ext4_fsmap irec;
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/* Set up search keys */
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info->gfi_low = keys[0];
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info->gfi_low.fmr_length = 0;
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memset(&info->gfi_high, 0xFF, sizeof(info->gfi_high));
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trace_ext4_fsmap_low_key(sb, info->gfi_dev, 0,
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info->gfi_low.fmr_physical,
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info->gfi_low.fmr_length,
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info->gfi_low.fmr_owner);
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trace_ext4_fsmap_high_key(sb, info->gfi_dev, 0,
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info->gfi_high.fmr_physical,
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info->gfi_high.fmr_length,
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info->gfi_high.fmr_owner);
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if (keys[0].fmr_physical > 0)
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return 0;
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/* Fabricate an rmap entry for the external log device. */
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irec.fmr_physical = journal->j_blk_offset;
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irec.fmr_length = journal->j_maxlen;
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irec.fmr_owner = EXT4_FMR_OWN_LOG;
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irec.fmr_flags = 0;
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return ext4_getfsmap_helper(sb, info, &irec);
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}
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/* Helper to fill out an ext4_fsmap. */
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static inline int ext4_getfsmap_fill(struct list_head *meta_list,
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ext4_fsblk_t fsb, ext4_fsblk_t len,
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uint64_t owner)
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{
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struct ext4_fsmap *fsm;
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fsm = kmalloc(sizeof(*fsm), GFP_NOFS);
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if (!fsm)
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return -ENOMEM;
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fsm->fmr_device = 0;
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fsm->fmr_flags = 0;
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fsm->fmr_physical = fsb;
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fsm->fmr_owner = owner;
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fsm->fmr_length = len;
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list_add_tail(&fsm->fmr_list, meta_list);
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return 0;
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}
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/*
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* This function returns the number of file system metadata blocks at
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* the beginning of a block group, including the reserved gdt blocks.
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*/
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static unsigned int ext4_getfsmap_find_sb(struct super_block *sb,
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ext4_group_t agno,
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struct list_head *meta_list)
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{
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struct ext4_sb_info *sbi = EXT4_SB(sb);
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ext4_fsblk_t fsb = ext4_group_first_block_no(sb, agno);
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ext4_fsblk_t len;
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unsigned long first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
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unsigned long metagroup = agno / EXT4_DESC_PER_BLOCK(sb);
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int error;
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/* Record the superblock. */
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if (ext4_bg_has_super(sb, agno)) {
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error = ext4_getfsmap_fill(meta_list, fsb, 1, EXT4_FMR_OWN_FS);
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if (error)
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return error;
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fsb++;
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}
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/* Record the group descriptors. */
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len = ext4_bg_num_gdb(sb, agno);
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if (!len)
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return 0;
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error = ext4_getfsmap_fill(meta_list, fsb, len,
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EXT4_FMR_OWN_GDT);
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if (error)
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return error;
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fsb += len;
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/* Reserved GDT blocks */
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if (!ext4_has_feature_meta_bg(sb) || metagroup < first_meta_bg) {
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len = le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks);
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error = ext4_getfsmap_fill(meta_list, fsb, len,
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EXT4_FMR_OWN_RESV_GDT);
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if (error)
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return error;
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}
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return 0;
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}
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/* Compare two fsmap items. */
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static int ext4_getfsmap_compare(void *priv,
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struct list_head *a,
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struct list_head *b)
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{
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struct ext4_fsmap *fa;
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struct ext4_fsmap *fb;
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fa = container_of(a, struct ext4_fsmap, fmr_list);
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fb = container_of(b, struct ext4_fsmap, fmr_list);
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if (fa->fmr_physical < fb->fmr_physical)
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return -1;
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else if (fa->fmr_physical > fb->fmr_physical)
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return 1;
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return 0;
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}
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/* Merge adjacent extents of fixed metadata. */
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static void ext4_getfsmap_merge_fixed_metadata(struct list_head *meta_list)
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{
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struct ext4_fsmap *p;
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struct ext4_fsmap *prev = NULL;
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struct ext4_fsmap *tmp;
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list_for_each_entry_safe(p, tmp, meta_list, fmr_list) {
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if (!prev) {
|
||||
prev = p;
|
||||
continue;
|
||||
}
|
||||
|
||||
if (prev->fmr_owner == p->fmr_owner &&
|
||||
prev->fmr_physical + prev->fmr_length == p->fmr_physical) {
|
||||
prev->fmr_length += p->fmr_length;
|
||||
list_del(&p->fmr_list);
|
||||
kfree(p);
|
||||
} else
|
||||
prev = p;
|
||||
}
|
||||
}
|
||||
|
||||
/* Free a list of fixed metadata. */
|
||||
static void ext4_getfsmap_free_fixed_metadata(struct list_head *meta_list)
|
||||
{
|
||||
struct ext4_fsmap *p;
|
||||
struct ext4_fsmap *tmp;
|
||||
|
||||
list_for_each_entry_safe(p, tmp, meta_list, fmr_list) {
|
||||
list_del(&p->fmr_list);
|
||||
kfree(p);
|
||||
}
|
||||
}
|
||||
|
||||
/* Find all the fixed metadata in the filesystem. */
|
||||
int ext4_getfsmap_find_fixed_metadata(struct super_block *sb,
|
||||
struct list_head *meta_list)
|
||||
{
|
||||
struct ext4_group_desc *gdp;
|
||||
ext4_group_t agno;
|
||||
int error;
|
||||
|
||||
INIT_LIST_HEAD(meta_list);
|
||||
|
||||
/* Collect everything. */
|
||||
for (agno = 0; agno < EXT4_SB(sb)->s_groups_count; agno++) {
|
||||
gdp = ext4_get_group_desc(sb, agno, NULL);
|
||||
if (!gdp) {
|
||||
error = -EFSCORRUPTED;
|
||||
goto err;
|
||||
}
|
||||
|
||||
/* Superblock & GDT */
|
||||
error = ext4_getfsmap_find_sb(sb, agno, meta_list);
|
||||
if (error)
|
||||
goto err;
|
||||
|
||||
/* Block bitmap */
|
||||
error = ext4_getfsmap_fill(meta_list,
|
||||
ext4_block_bitmap(sb, gdp), 1,
|
||||
EXT4_FMR_OWN_BLKBM);
|
||||
if (error)
|
||||
goto err;
|
||||
|
||||
/* Inode bitmap */
|
||||
error = ext4_getfsmap_fill(meta_list,
|
||||
ext4_inode_bitmap(sb, gdp), 1,
|
||||
EXT4_FMR_OWN_INOBM);
|
||||
if (error)
|
||||
goto err;
|
||||
|
||||
/* Inodes */
|
||||
error = ext4_getfsmap_fill(meta_list,
|
||||
ext4_inode_table(sb, gdp),
|
||||
EXT4_SB(sb)->s_itb_per_group,
|
||||
EXT4_FMR_OWN_INODES);
|
||||
if (error)
|
||||
goto err;
|
||||
}
|
||||
|
||||
/* Sort the list */
|
||||
list_sort(NULL, meta_list, ext4_getfsmap_compare);
|
||||
|
||||
/* Merge adjacent extents */
|
||||
ext4_getfsmap_merge_fixed_metadata(meta_list);
|
||||
|
||||
return 0;
|
||||
err:
|
||||
ext4_getfsmap_free_fixed_metadata(meta_list);
|
||||
return error;
|
||||
}
|
||||
|
||||
/* Execute a getfsmap query against the buddy bitmaps */
|
||||
static int ext4_getfsmap_datadev(struct super_block *sb,
|
||||
struct ext4_fsmap *keys,
|
||||
struct ext4_getfsmap_info *info)
|
||||
{
|
||||
struct ext4_sb_info *sbi = EXT4_SB(sb);
|
||||
ext4_fsblk_t start_fsb;
|
||||
ext4_fsblk_t end_fsb;
|
||||
ext4_fsblk_t eofs;
|
||||
ext4_group_t start_ag;
|
||||
ext4_group_t end_ag;
|
||||
ext4_grpblk_t first_cluster;
|
||||
ext4_grpblk_t last_cluster;
|
||||
int error = 0;
|
||||
|
||||
eofs = ext4_blocks_count(sbi->s_es);
|
||||
if (keys[0].fmr_physical >= eofs)
|
||||
return 0;
|
||||
if (keys[1].fmr_physical >= eofs)
|
||||
keys[1].fmr_physical = eofs - 1;
|
||||
start_fsb = keys[0].fmr_physical;
|
||||
end_fsb = keys[1].fmr_physical;
|
||||
|
||||
/* Determine first and last group to examine based on start and end */
|
||||
ext4_get_group_no_and_offset(sb, start_fsb, &start_ag, &first_cluster);
|
||||
ext4_get_group_no_and_offset(sb, end_fsb, &end_ag, &last_cluster);
|
||||
|
||||
/*
|
||||
* Convert the fsmap low/high keys to bg based keys. Initialize
|
||||
* low to the fsmap low key and max out the high key to the end
|
||||
* of the bg.
|
||||
*/
|
||||
info->gfi_low = keys[0];
|
||||
info->gfi_low.fmr_physical = EXT4_C2B(sbi, first_cluster);
|
||||
info->gfi_low.fmr_length = 0;
|
||||
|
||||
memset(&info->gfi_high, 0xFF, sizeof(info->gfi_high));
|
||||
|
||||
/* Assemble a list of all the fixed-location metadata. */
|
||||
error = ext4_getfsmap_find_fixed_metadata(sb, &info->gfi_meta_list);
|
||||
if (error)
|
||||
goto err;
|
||||
|
||||
/* Query each bg */
|
||||
for (info->gfi_agno = start_ag;
|
||||
info->gfi_agno <= end_ag;
|
||||
info->gfi_agno++) {
|
||||
/*
|
||||
* Set the bg high key from the fsmap high key if this
|
||||
* is the last bg that we're querying.
|
||||
*/
|
||||
if (info->gfi_agno == end_ag) {
|
||||
info->gfi_high = keys[1];
|
||||
info->gfi_high.fmr_physical = EXT4_C2B(sbi,
|
||||
last_cluster);
|
||||
info->gfi_high.fmr_length = 0;
|
||||
}
|
||||
|
||||
trace_ext4_fsmap_low_key(sb, info->gfi_dev, info->gfi_agno,
|
||||
info->gfi_low.fmr_physical,
|
||||
info->gfi_low.fmr_length,
|
||||
info->gfi_low.fmr_owner);
|
||||
|
||||
trace_ext4_fsmap_high_key(sb, info->gfi_dev, info->gfi_agno,
|
||||
info->gfi_high.fmr_physical,
|
||||
info->gfi_high.fmr_length,
|
||||
info->gfi_high.fmr_owner);
|
||||
|
||||
error = ext4_mballoc_query_range(sb, info->gfi_agno,
|
||||
EXT4_B2C(sbi, info->gfi_low.fmr_physical),
|
||||
EXT4_B2C(sbi, info->gfi_high.fmr_physical),
|
||||
ext4_getfsmap_datadev_helper, info);
|
||||
if (error)
|
||||
goto err;
|
||||
|
||||
/*
|
||||
* Set the bg low key to the start of the bg prior to
|
||||
* moving on to the next bg.
|
||||
*/
|
||||
if (info->gfi_agno == start_ag)
|
||||
memset(&info->gfi_low, 0, sizeof(info->gfi_low));
|
||||
}
|
||||
|
||||
/* Do we have a retained free extent? */
|
||||
if (info->gfi_lastfree.fmr_owner) {
|
||||
error = ext4_getfsmap_helper(sb, info, &info->gfi_lastfree);
|
||||
if (error)
|
||||
goto err;
|
||||
}
|
||||
|
||||
/* Report any gaps at the end of the bg */
|
||||
info->gfi_last = true;
|
||||
error = ext4_getfsmap_datadev_helper(sb, end_ag, last_cluster, 0, info);
|
||||
if (error)
|
||||
goto err;
|
||||
|
||||
err:
|
||||
ext4_getfsmap_free_fixed_metadata(&info->gfi_meta_list);
|
||||
return error;
|
||||
}
|
||||
|
||||
/* Do we recognize the device? */
|
||||
static bool ext4_getfsmap_is_valid_device(struct super_block *sb,
|
||||
struct ext4_fsmap *fm)
|
||||
{
|
||||
if (fm->fmr_device == 0 || fm->fmr_device == UINT_MAX ||
|
||||
fm->fmr_device == new_encode_dev(sb->s_bdev->bd_dev))
|
||||
return true;
|
||||
if (EXT4_SB(sb)->journal_bdev &&
|
||||
fm->fmr_device == new_encode_dev(EXT4_SB(sb)->journal_bdev->bd_dev))
|
||||
return true;
|
||||
return false;
|
||||
}
|
||||
|
||||
/* Ensure that the low key is less than the high key. */
|
||||
static bool ext4_getfsmap_check_keys(struct ext4_fsmap *low_key,
|
||||
struct ext4_fsmap *high_key)
|
||||
{
|
||||
if (low_key->fmr_device > high_key->fmr_device)
|
||||
return false;
|
||||
if (low_key->fmr_device < high_key->fmr_device)
|
||||
return true;
|
||||
|
||||
if (low_key->fmr_physical > high_key->fmr_physical)
|
||||
return false;
|
||||
if (low_key->fmr_physical < high_key->fmr_physical)
|
||||
return true;
|
||||
|
||||
if (low_key->fmr_owner > high_key->fmr_owner)
|
||||
return false;
|
||||
if (low_key->fmr_owner < high_key->fmr_owner)
|
||||
return true;
|
||||
|
||||
return false;
|
||||
}
|
||||
|
||||
#define EXT4_GETFSMAP_DEVS 2
|
||||
/*
|
||||
* Get filesystem's extents as described in head, and format for
|
||||
* output. Calls formatter to fill the user's buffer until all
|
||||
* extents are mapped, until the passed-in head->fmh_count slots have
|
||||
* been filled, or until the formatter short-circuits the loop, if it
|
||||
* is tracking filled-in extents on its own.
|
||||
*
|
||||
* Key to Confusion
|
||||
* ----------------
|
||||
* There are multiple levels of keys and counters at work here:
|
||||
* _fsmap_head.fmh_keys -- low and high fsmap keys passed in;
|
||||
* these reflect fs-wide block addrs.
|
||||
* dkeys -- fmh_keys used to query each device;
|
||||
* these are fmh_keys but w/ the low key
|
||||
* bumped up by fmr_length.
|
||||
* _getfsmap_info.gfi_next_fsblk-- next fs block we expect to see; this
|
||||
* is how we detect gaps in the fsmap
|
||||
* records and report them.
|
||||
* _getfsmap_info.gfi_low/high -- per-bg low/high keys computed from
|
||||
* dkeys; used to query the free space.
|
||||
*/
|
||||
int ext4_getfsmap(struct super_block *sb, struct ext4_fsmap_head *head,
|
||||
ext4_fsmap_format_t formatter, void *arg)
|
||||
{
|
||||
struct ext4_fsmap dkeys[2]; /* per-dev keys */
|
||||
struct ext4_getfsmap_dev handlers[EXT4_GETFSMAP_DEVS];
|
||||
struct ext4_getfsmap_info info = {0};
|
||||
int i;
|
||||
int error = 0;
|
||||
|
||||
if (head->fmh_iflags & ~FMH_IF_VALID)
|
||||
return -EINVAL;
|
||||
if (!ext4_getfsmap_is_valid_device(sb, &head->fmh_keys[0]) ||
|
||||
!ext4_getfsmap_is_valid_device(sb, &head->fmh_keys[1]))
|
||||
return -EINVAL;
|
||||
|
||||
head->fmh_entries = 0;
|
||||
|
||||
/* Set up our device handlers. */
|
||||
memset(handlers, 0, sizeof(handlers));
|
||||
handlers[0].gfd_dev = new_encode_dev(sb->s_bdev->bd_dev);
|
||||
handlers[0].gfd_fn = ext4_getfsmap_datadev;
|
||||
if (EXT4_SB(sb)->journal_bdev) {
|
||||
handlers[1].gfd_dev = new_encode_dev(
|
||||
EXT4_SB(sb)->journal_bdev->bd_dev);
|
||||
handlers[1].gfd_fn = ext4_getfsmap_logdev;
|
||||
}
|
||||
|
||||
sort(handlers, EXT4_GETFSMAP_DEVS, sizeof(struct ext4_getfsmap_dev),
|
||||
ext4_getfsmap_dev_compare, NULL);
|
||||
|
||||
/*
|
||||
* To continue where we left off, we allow userspace to use the
|
||||
* last mapping from a previous call as the low key of the next.
|
||||
* This is identified by a non-zero length in the low key. We
|
||||
* have to increment the low key in this scenario to ensure we
|
||||
* don't return the same mapping again, and instead return the
|
||||
* very next mapping.
|
||||
*
|
||||
* Bump the physical offset as there can be no other mapping for
|
||||
* the same physical block range.
|
||||
*/
|
||||
dkeys[0] = head->fmh_keys[0];
|
||||
dkeys[0].fmr_physical += dkeys[0].fmr_length;
|
||||
dkeys[0].fmr_owner = 0;
|
||||
dkeys[0].fmr_length = 0;
|
||||
memset(&dkeys[1], 0xFF, sizeof(struct ext4_fsmap));
|
||||
|
||||
if (!ext4_getfsmap_check_keys(dkeys, &head->fmh_keys[1]))
|
||||
return -EINVAL;
|
||||
|
||||
info.gfi_next_fsblk = head->fmh_keys[0].fmr_physical +
|
||||
head->fmh_keys[0].fmr_length;
|
||||
info.gfi_formatter = formatter;
|
||||
info.gfi_format_arg = arg;
|
||||
info.gfi_head = head;
|
||||
|
||||
/* For each device we support... */
|
||||
for (i = 0; i < EXT4_GETFSMAP_DEVS; i++) {
|
||||
/* Is this device within the range the user asked for? */
|
||||
if (!handlers[i].gfd_fn)
|
||||
continue;
|
||||
if (head->fmh_keys[0].fmr_device > handlers[i].gfd_dev)
|
||||
continue;
|
||||
if (head->fmh_keys[1].fmr_device < handlers[i].gfd_dev)
|
||||
break;
|
||||
|
||||
/*
|
||||
* If this device number matches the high key, we have
|
||||
* to pass the high key to the handler to limit the
|
||||
* query results. If the device number exceeds the
|
||||
* low key, zero out the low key so that we get
|
||||
* everything from the beginning.
|
||||
*/
|
||||
if (handlers[i].gfd_dev == head->fmh_keys[1].fmr_device)
|
||||
dkeys[1] = head->fmh_keys[1];
|
||||
if (handlers[i].gfd_dev > head->fmh_keys[0].fmr_device)
|
||||
memset(&dkeys[0], 0, sizeof(struct ext4_fsmap));
|
||||
|
||||
info.gfi_dev = handlers[i].gfd_dev;
|
||||
info.gfi_last = false;
|
||||
info.gfi_agno = -1;
|
||||
error = handlers[i].gfd_fn(sb, dkeys, &info);
|
||||
if (error)
|
||||
break;
|
||||
info.gfi_next_fsblk = 0;
|
||||
}
|
||||
|
||||
head->fmh_oflags = FMH_OF_DEV_T;
|
||||
return error;
|
||||
}
|
69
fs/ext4/fsmap.h
Normal file
69
fs/ext4/fsmap.h
Normal file
|
@ -0,0 +1,69 @@
|
|||
/*
|
||||
* Copyright (C) 2017 Oracle. All Rights Reserved.
|
||||
*
|
||||
* Author: Darrick J. Wong <darrick.wong@oracle.com>
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or
|
||||
* modify it under the terms of the GNU General Public License
|
||||
* as published by the Free Software Foundation; either version 2
|
||||
* of the License, or (at your option) any later version.
|
||||
*
|
||||
* This program is distributed in the hope that it would be useful,
|
||||
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||
* GNU General Public License for more details.
|
||||
*
|
||||
* You should have received a copy of the GNU General Public License
|
||||
* along with this program; if not, write the Free Software Foundation,
|
||||
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
|
||||
*/
|
||||
#ifndef __EXT4_FSMAP_H__
|
||||
#define __EXT4_FSMAP_H__
|
||||
|
||||
struct fsmap;
|
||||
|
||||
/* internal fsmap representation */
|
||||
struct ext4_fsmap {
|
||||
struct list_head fmr_list;
|
||||
dev_t fmr_device; /* device id */
|
||||
uint32_t fmr_flags; /* mapping flags */
|
||||
uint64_t fmr_physical; /* device offset of segment */
|
||||
uint64_t fmr_owner; /* owner id */
|
||||
uint64_t fmr_length; /* length of segment, blocks */
|
||||
};
|
||||
|
||||
struct ext4_fsmap_head {
|
||||
uint32_t fmh_iflags; /* control flags */
|
||||
uint32_t fmh_oflags; /* output flags */
|
||||
unsigned int fmh_count; /* # of entries in array incl. input */
|
||||
unsigned int fmh_entries; /* # of entries filled in (output). */
|
||||
|
||||
struct ext4_fsmap fmh_keys[2]; /* low and high keys */
|
||||
};
|
||||
|
||||
void ext4_fsmap_from_internal(struct super_block *sb, struct fsmap *dest,
|
||||
struct ext4_fsmap *src);
|
||||
void ext4_fsmap_to_internal(struct super_block *sb, struct ext4_fsmap *dest,
|
||||
struct fsmap *src);
|
||||
|
||||
/* fsmap to userspace formatter - copy to user & advance pointer */
|
||||
typedef int (*ext4_fsmap_format_t)(struct ext4_fsmap *, void *);
|
||||
|
||||
int ext4_getfsmap(struct super_block *sb, struct ext4_fsmap_head *head,
|
||||
ext4_fsmap_format_t formatter, void *arg);
|
||||
|
||||
#define EXT4_QUERY_RANGE_ABORT 1
|
||||
#define EXT4_QUERY_RANGE_CONTINUE 0
|
||||
|
||||
/* fmr_owner special values for FS_IOC_GETFSMAP; some share w/ XFS */
|
||||
#define EXT4_FMR_OWN_FREE FMR_OWN_FREE /* free space */
|
||||
#define EXT4_FMR_OWN_UNKNOWN FMR_OWN_UNKNOWN /* unknown owner */
|
||||
#define EXT4_FMR_OWN_FS FMR_OWNER('X', 1) /* static fs metadata */
|
||||
#define EXT4_FMR_OWN_LOG FMR_OWNER('X', 2) /* journalling log */
|
||||
#define EXT4_FMR_OWN_INODES FMR_OWNER('X', 5) /* inodes */
|
||||
#define EXT4_FMR_OWN_GDT FMR_OWNER('f', 1) /* group descriptors */
|
||||
#define EXT4_FMR_OWN_RESV_GDT FMR_OWNER('f', 2) /* reserved gdt blocks */
|
||||
#define EXT4_FMR_OWN_BLKBM FMR_OWNER('f', 3) /* inode bitmap */
|
||||
#define EXT4_FMR_OWN_INOBM FMR_OWNER('f', 4) /* block bitmap */
|
||||
|
||||
#endif /* __EXT4_FSMAP_H__ */
|
|
@ -19,6 +19,9 @@
|
|||
#include <linux/delay.h>
|
||||
#include "ext4_jbd2.h"
|
||||
#include "ext4.h"
|
||||
#include <linux/fsmap.h>
|
||||
#include "fsmap.h"
|
||||
#include <trace/events/ext4.h>
|
||||
|
||||
/**
|
||||
* Swap memory between @a and @b for @len bytes.
|
||||
|
@ -489,6 +492,90 @@ int ext4_shutdown(struct super_block *sb, unsigned long arg)
|
|||
return 0;
|
||||
}
|
||||
|
||||
struct getfsmap_info {
|
||||
struct super_block *gi_sb;
|
||||
struct fsmap_head __user *gi_data;
|
||||
unsigned int gi_idx;
|
||||
__u32 gi_last_flags;
|
||||
};
|
||||
|
||||
static int ext4_getfsmap_format(struct ext4_fsmap *xfm, void *priv)
|
||||
{
|
||||
struct getfsmap_info *info = priv;
|
||||
struct fsmap fm;
|
||||
|
||||
trace_ext4_getfsmap_mapping(info->gi_sb, xfm);
|
||||
|
||||
info->gi_last_flags = xfm->fmr_flags;
|
||||
ext4_fsmap_from_internal(info->gi_sb, &fm, xfm);
|
||||
if (copy_to_user(&info->gi_data->fmh_recs[info->gi_idx++], &fm,
|
||||
sizeof(struct fsmap)))
|
||||
return -EFAULT;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int ext4_ioc_getfsmap(struct super_block *sb,
|
||||
struct fsmap_head __user *arg)
|
||||
{
|
||||
struct getfsmap_info info = {0};
|
||||
struct ext4_fsmap_head xhead = {0};
|
||||
struct fsmap_head head;
|
||||
bool aborted = false;
|
||||
int error;
|
||||
|
||||
if (copy_from_user(&head, arg, sizeof(struct fsmap_head)))
|
||||
return -EFAULT;
|
||||
if (memchr_inv(head.fmh_reserved, 0, sizeof(head.fmh_reserved)) ||
|
||||
memchr_inv(head.fmh_keys[0].fmr_reserved, 0,
|
||||
sizeof(head.fmh_keys[0].fmr_reserved)) ||
|
||||
memchr_inv(head.fmh_keys[1].fmr_reserved, 0,
|
||||
sizeof(head.fmh_keys[1].fmr_reserved)))
|
||||
return -EINVAL;
|
||||
/*
|
||||
* ext4 doesn't report file extents at all, so the only valid
|
||||
* file offsets are the magic ones (all zeroes or all ones).
|
||||
*/
|
||||
if (head.fmh_keys[0].fmr_offset ||
|
||||
(head.fmh_keys[1].fmr_offset != 0 &&
|
||||
head.fmh_keys[1].fmr_offset != -1ULL))
|
||||
return -EINVAL;
|
||||
|
||||
xhead.fmh_iflags = head.fmh_iflags;
|
||||
xhead.fmh_count = head.fmh_count;
|
||||
ext4_fsmap_to_internal(sb, &xhead.fmh_keys[0], &head.fmh_keys[0]);
|
||||
ext4_fsmap_to_internal(sb, &xhead.fmh_keys[1], &head.fmh_keys[1]);
|
||||
|
||||
trace_ext4_getfsmap_low_key(sb, &xhead.fmh_keys[0]);
|
||||
trace_ext4_getfsmap_high_key(sb, &xhead.fmh_keys[1]);
|
||||
|
||||
info.gi_sb = sb;
|
||||
info.gi_data = arg;
|
||||
error = ext4_getfsmap(sb, &xhead, ext4_getfsmap_format, &info);
|
||||
if (error == EXT4_QUERY_RANGE_ABORT) {
|
||||
error = 0;
|
||||
aborted = true;
|
||||
} else if (error)
|
||||
return error;
|
||||
|
||||
/* If we didn't abort, set the "last" flag in the last fmx */
|
||||
if (!aborted && info.gi_idx) {
|
||||
info.gi_last_flags |= FMR_OF_LAST;
|
||||
if (copy_to_user(&info.gi_data->fmh_recs[info.gi_idx - 1].fmr_flags,
|
||||
&info.gi_last_flags,
|
||||
sizeof(info.gi_last_flags)))
|
||||
return -EFAULT;
|
||||
}
|
||||
|
||||
/* copy back header */
|
||||
head.fmh_entries = xhead.fmh_entries;
|
||||
head.fmh_oflags = xhead.fmh_oflags;
|
||||
if (copy_to_user(arg, &head, sizeof(struct fsmap_head)))
|
||||
return -EFAULT;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
long ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
|
||||
{
|
||||
struct inode *inode = file_inode(filp);
|
||||
|
@ -499,6 +586,8 @@ long ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
|
|||
ext4_debug("cmd = %u, arg = %lu\n", cmd, arg);
|
||||
|
||||
switch (cmd) {
|
||||
case FS_IOC_GETFSMAP:
|
||||
return ext4_ioc_getfsmap(sb, (void __user *)arg);
|
||||
case EXT4_IOC_GETFLAGS:
|
||||
ext4_get_inode_flags(ei);
|
||||
flags = ei->i_flags & EXT4_FL_USER_VISIBLE;
|
||||
|
@ -1009,6 +1098,7 @@ long ext4_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
|
|||
case EXT4_IOC_GET_ENCRYPTION_PWSALT:
|
||||
case EXT4_IOC_GET_ENCRYPTION_POLICY:
|
||||
case EXT4_IOC_SHUTDOWN:
|
||||
case FS_IOC_GETFSMAP:
|
||||
break;
|
||||
default:
|
||||
return -ENOIOCTLCMD;
|
||||
|
|
|
@ -5277,3 +5277,52 @@ int ext4_trim_fs(struct super_block *sb, struct fstrim_range *range)
|
|||
range->len = EXT4_C2B(EXT4_SB(sb), trimmed) << sb->s_blocksize_bits;
|
||||
return ret;
|
||||
}
|
||||
|
||||
/* Iterate all the free extents in the group. */
|
||||
int
|
||||
ext4_mballoc_query_range(
|
||||
struct super_block *sb,
|
||||
ext4_group_t group,
|
||||
ext4_grpblk_t start,
|
||||
ext4_grpblk_t end,
|
||||
ext4_mballoc_query_range_fn formatter,
|
||||
void *priv)
|
||||
{
|
||||
void *bitmap;
|
||||
ext4_grpblk_t next;
|
||||
struct ext4_buddy e4b;
|
||||
int error;
|
||||
|
||||
error = ext4_mb_load_buddy(sb, group, &e4b);
|
||||
if (error)
|
||||
return error;
|
||||
bitmap = e4b.bd_bitmap;
|
||||
|
||||
ext4_lock_group(sb, group);
|
||||
|
||||
start = (e4b.bd_info->bb_first_free > start) ?
|
||||
e4b.bd_info->bb_first_free : start;
|
||||
if (end >= EXT4_CLUSTERS_PER_GROUP(sb))
|
||||
end = EXT4_CLUSTERS_PER_GROUP(sb) - 1;
|
||||
|
||||
while (start <= end) {
|
||||
start = mb_find_next_zero_bit(bitmap, end + 1, start);
|
||||
if (start > end)
|
||||
break;
|
||||
next = mb_find_next_bit(bitmap, end + 1, start);
|
||||
|
||||
ext4_unlock_group(sb, group);
|
||||
error = formatter(sb, group, start, next - start, priv);
|
||||
if (error)
|
||||
goto out_unload;
|
||||
ext4_lock_group(sb, group);
|
||||
|
||||
start = next + 1;
|
||||
}
|
||||
|
||||
ext4_unlock_group(sb, group);
|
||||
out_unload:
|
||||
ext4_mb_unload_buddy(&e4b);
|
||||
|
||||
return error;
|
||||
}
|
||||
|
|
|
@ -199,4 +199,21 @@ static inline ext4_fsblk_t ext4_grp_offs_to_block(struct super_block *sb,
|
|||
return ext4_group_first_block_no(sb, fex->fe_group) +
|
||||
(fex->fe_start << EXT4_SB(sb)->s_cluster_bits);
|
||||
}
|
||||
|
||||
typedef int (*ext4_mballoc_query_range_fn)(
|
||||
struct super_block *sb,
|
||||
ext4_group_t agno,
|
||||
ext4_grpblk_t start,
|
||||
ext4_grpblk_t len,
|
||||
void *priv);
|
||||
|
||||
int
|
||||
ext4_mballoc_query_range(
|
||||
struct super_block *sb,
|
||||
ext4_group_t agno,
|
||||
ext4_grpblk_t start,
|
||||
ext4_grpblk_t end,
|
||||
ext4_mballoc_query_range_fn formatter,
|
||||
void *priv);
|
||||
|
||||
#endif
|
||||
|
|
|
@ -49,6 +49,7 @@
|
|||
#include "xattr.h"
|
||||
#include "acl.h"
|
||||
#include "mballoc.h"
|
||||
#include "fsmap.h"
|
||||
|
||||
#define CREATE_TRACE_POINTS
|
||||
#include <trace/events/ext4.h>
|
||||
|
|
|
@ -15,6 +15,7 @@ struct ext4_inode_info;
|
|||
struct mpage_da_data;
|
||||
struct ext4_map_blocks;
|
||||
struct extent_status;
|
||||
struct ext4_fsmap;
|
||||
|
||||
#define EXT4_I(inode) (container_of(inode, struct ext4_inode_info, vfs_inode))
|
||||
|
||||
|
@ -2529,6 +2530,79 @@ TRACE_EVENT(ext4_es_shrink,
|
|||
__entry->scan_time, __entry->nr_skipped, __entry->retried)
|
||||
);
|
||||
|
||||
/* fsmap traces */
|
||||
DECLARE_EVENT_CLASS(ext4_fsmap_class,
|
||||
TP_PROTO(struct super_block *sb, u32 keydev, u32 agno, u64 bno, u64 len,
|
||||
u64 owner),
|
||||
TP_ARGS(sb, keydev, agno, bno, len, owner),
|
||||
TP_STRUCT__entry(
|
||||
__field(dev_t, dev)
|
||||
__field(dev_t, keydev)
|
||||
__field(u32, agno)
|
||||
__field(u64, bno)
|
||||
__field(u64, len)
|
||||
__field(u64, owner)
|
||||
),
|
||||
TP_fast_assign(
|
||||
__entry->dev = sb->s_bdev->bd_dev;
|
||||
__entry->keydev = new_decode_dev(keydev);
|
||||
__entry->agno = agno;
|
||||
__entry->bno = bno;
|
||||
__entry->len = len;
|
||||
__entry->owner = owner;
|
||||
),
|
||||
TP_printk("dev %d:%d keydev %d:%d agno %u bno %llu len %llu owner %lld\n",
|
||||
MAJOR(__entry->dev), MINOR(__entry->dev),
|
||||
MAJOR(__entry->keydev), MINOR(__entry->keydev),
|
||||
__entry->agno,
|
||||
__entry->bno,
|
||||
__entry->len,
|
||||
__entry->owner)
|
||||
)
|
||||
#define DEFINE_FSMAP_EVENT(name) \
|
||||
DEFINE_EVENT(ext4_fsmap_class, name, \
|
||||
TP_PROTO(struct super_block *sb, u32 keydev, u32 agno, u64 bno, u64 len, \
|
||||
u64 owner), \
|
||||
TP_ARGS(sb, keydev, agno, bno, len, owner))
|
||||
DEFINE_FSMAP_EVENT(ext4_fsmap_low_key);
|
||||
DEFINE_FSMAP_EVENT(ext4_fsmap_high_key);
|
||||
DEFINE_FSMAP_EVENT(ext4_fsmap_mapping);
|
||||
|
||||
DECLARE_EVENT_CLASS(ext4_getfsmap_class,
|
||||
TP_PROTO(struct super_block *sb, struct ext4_fsmap *fsmap),
|
||||
TP_ARGS(sb, fsmap),
|
||||
TP_STRUCT__entry(
|
||||
__field(dev_t, dev)
|
||||
__field(dev_t, keydev)
|
||||
__field(u64, block)
|
||||
__field(u64, len)
|
||||
__field(u64, owner)
|
||||
__field(u64, flags)
|
||||
),
|
||||
TP_fast_assign(
|
||||
__entry->dev = sb->s_bdev->bd_dev;
|
||||
__entry->keydev = new_decode_dev(fsmap->fmr_device);
|
||||
__entry->block = fsmap->fmr_physical;
|
||||
__entry->len = fsmap->fmr_length;
|
||||
__entry->owner = fsmap->fmr_owner;
|
||||
__entry->flags = fsmap->fmr_flags;
|
||||
),
|
||||
TP_printk("dev %d:%d keydev %d:%d block %llu len %llu owner %lld flags 0x%llx\n",
|
||||
MAJOR(__entry->dev), MINOR(__entry->dev),
|
||||
MAJOR(__entry->keydev), MINOR(__entry->keydev),
|
||||
__entry->block,
|
||||
__entry->len,
|
||||
__entry->owner,
|
||||
__entry->flags)
|
||||
)
|
||||
#define DEFINE_GETFSMAP_EVENT(name) \
|
||||
DEFINE_EVENT(ext4_getfsmap_class, name, \
|
||||
TP_PROTO(struct super_block *sb, struct ext4_fsmap *fsmap), \
|
||||
TP_ARGS(sb, fsmap))
|
||||
DEFINE_GETFSMAP_EVENT(ext4_getfsmap_low_key);
|
||||
DEFINE_GETFSMAP_EVENT(ext4_getfsmap_high_key);
|
||||
DEFINE_GETFSMAP_EVENT(ext4_getfsmap_mapping);
|
||||
|
||||
#endif /* _TRACE_EXT4_H */
|
||||
|
||||
/* This part must be outside protection */
|
||||
|
|
Loading…
Reference in a new issue