From: Konstantin Komarov almaz.alexandrovich@paragon-software.com
[ Upstream commit 6a4cd3ea7d771be17177d95ff67d22cfa2a38b50 ]
Some code refactoring added also.
Signed-off-by: Konstantin Komarov almaz.alexandrovich@paragon-software.com Signed-off-by: Sasha Levin sashal@kernel.org --- fs/ntfs3/super.c | 98 +++++++++++++++++++++++++++++++++++------------- 1 file changed, 71 insertions(+), 27 deletions(-)
diff --git a/fs/ntfs3/super.c b/fs/ntfs3/super.c index 5158dd31fd97f..ecf899d571d83 100644 --- a/fs/ntfs3/super.c +++ b/fs/ntfs3/super.c @@ -724,6 +724,8 @@ static int ntfs_init_from_boot(struct super_block *sb, u32 sector_size, struct MFT_REC *rec; u16 fn, ao; u8 cluster_bits; + u32 boot_off = 0; + const char *hint = "Primary boot";
sbi->volume.blocks = dev_size >> PAGE_SHIFT;
@@ -731,11 +733,12 @@ static int ntfs_init_from_boot(struct super_block *sb, u32 sector_size, if (!bh) return -EIO;
+check_boot: err = -EINVAL; - boot = (struct NTFS_BOOT *)bh->b_data; + boot = (struct NTFS_BOOT *)Add2Ptr(bh->b_data, boot_off);
if (memcmp(boot->system_id, "NTFS ", sizeof("NTFS ") - 1)) { - ntfs_err(sb, "Boot's signature is not NTFS."); + ntfs_err(sb, "%s signature is not NTFS.", hint); goto out; }
@@ -748,14 +751,16 @@ static int ntfs_init_from_boot(struct super_block *sb, u32 sector_size, boot->bytes_per_sector[0]; if (boot_sector_size < SECTOR_SIZE || !is_power_of_2(boot_sector_size)) { - ntfs_err(sb, "Invalid bytes per sector %u.", boot_sector_size); + ntfs_err(sb, "%s: invalid bytes per sector %u.", hint, + boot_sector_size); goto out; }
/* cluster size: 512, 1K, 2K, 4K, ... 2M */ sct_per_clst = true_sectors_per_clst(boot); if ((int)sct_per_clst < 0 || !is_power_of_2(sct_per_clst)) { - ntfs_err(sb, "Invalid sectors per cluster %u.", sct_per_clst); + ntfs_err(sb, "%s: invalid sectors per cluster %u.", hint, + sct_per_clst); goto out; }
@@ -771,8 +776,8 @@ static int ntfs_init_from_boot(struct super_block *sb, u32 sector_size, if (mlcn * sct_per_clst >= sectors || mlcn2 * sct_per_clst >= sectors) { ntfs_err( sb, - "Start of MFT 0x%llx (0x%llx) is out of volume 0x%llx.", - mlcn, mlcn2, sectors); + "%s: start of MFT 0x%llx (0x%llx) is out of volume 0x%llx.", + hint, mlcn, mlcn2, sectors); goto out; }
@@ -784,7 +789,7 @@ static int ntfs_init_from_boot(struct super_block *sb, u32 sector_size,
/* Check MFT record size. */ if (record_size < SECTOR_SIZE || !is_power_of_2(record_size)) { - ntfs_err(sb, "Invalid bytes per MFT record %u (%d).", + ntfs_err(sb, "%s: invalid bytes per MFT record %u (%d).", hint, record_size, boot->record_size); goto out; } @@ -801,13 +806,13 @@ static int ntfs_init_from_boot(struct super_block *sb, u32 sector_size,
/* Check index record size. */ if (sbi->index_size < SECTOR_SIZE || !is_power_of_2(sbi->index_size)) { - ntfs_err(sb, "Invalid bytes per index %u(%d).", sbi->index_size, - boot->index_size); + ntfs_err(sb, "%s: invalid bytes per index %u(%d).", hint, + sbi->index_size, boot->index_size); goto out; }
if (sbi->index_size > MAXIMUM_BYTES_PER_INDEX) { - ntfs_err(sb, "Unsupported bytes per index %u.", + ntfs_err(sb, "%s: unsupported bytes per index %u.", hint, sbi->index_size); goto out; } @@ -834,7 +839,7 @@ static int ntfs_init_from_boot(struct super_block *sb, u32 sector_size,
/* Compare boot's cluster and sector. */ if (sbi->cluster_size < boot_sector_size) { - ntfs_err(sb, "Invalid bytes per cluster (%u).", + ntfs_err(sb, "%s: invalid bytes per cluster (%u).", hint, sbi->cluster_size); goto out; } @@ -930,7 +935,46 @@ static int ntfs_init_from_boot(struct super_block *sb, u32 sector_size,
err = 0;
+ if (bh->b_blocknr && !sb_rdonly(sb)) { + /* + * Alternative boot is ok but primary is not ok. + * Update primary boot. + */ + struct buffer_head *bh0 = sb_getblk(sb, 0); + if (bh0) { + if (buffer_locked(bh0)) + __wait_on_buffer(bh0); + + lock_buffer(bh0); + memcpy(bh0->b_data, boot, sizeof(*boot)); + set_buffer_uptodate(bh0); + mark_buffer_dirty(bh0); + unlock_buffer(bh0); + if (!sync_dirty_buffer(bh0)) + ntfs_warn(sb, "primary boot is updated"); + put_bh(bh0); + } + } + out: + if (err == -EINVAL && !bh->b_blocknr && dev_size > PAGE_SHIFT) { + u32 block_size = min_t(u32, sector_size, PAGE_SIZE); + u64 lbo = dev_size - sizeof(*boot); + + /* + * Try alternative boot (last sector) + */ + brelse(bh); + + sb_set_blocksize(sb, block_size); + bh = ntfs_bread(sb, lbo >> blksize_bits(block_size)); + if (!bh) + return -EINVAL; + + boot_off = lbo & (block_size - 1); + hint = "Alternative boot"; + goto check_boot; + } brelse(bh);
return err; @@ -955,6 +999,7 @@ static int ntfs_fill_super(struct super_block *sb, struct fs_context *fc) struct ATTR_DEF_ENTRY *t; u16 *shared; struct MFT_REF ref; + bool ro = sb_rdonly(sb);
ref.high = 0;
@@ -1035,6 +1080,10 @@ static int ntfs_fill_super(struct super_block *sb, struct fs_context *fc) sbi->volume.minor_ver = info->minor_ver; sbi->volume.flags = info->flags; sbi->volume.ni = ni; + if (info->flags & VOLUME_FLAG_DIRTY) { + sbi->volume.real_dirty = true; + ntfs_info(sb, "It is recommened to use chkdsk."); + }
/* Load $MFTMirr to estimate recs_mirr. */ ref.low = cpu_to_le32(MFT_REC_MIRR); @@ -1069,21 +1118,16 @@ static int ntfs_fill_super(struct super_block *sb, struct fs_context *fc)
iput(inode);
- if (sbi->flags & NTFS_FLAGS_NEED_REPLAY) { - if (!sb_rdonly(sb)) { - ntfs_warn(sb, - "failed to replay log file. Can't mount rw!"); - err = -EINVAL; - goto out; - } - } else if (sbi->volume.flags & VOLUME_FLAG_DIRTY) { - if (!sb_rdonly(sb) && !options->force) { - ntfs_warn( - sb, - "volume is dirty and "force" flag is not set!"); - err = -EINVAL; - goto out; - } + if ((sbi->flags & NTFS_FLAGS_NEED_REPLAY) && !ro) { + ntfs_warn(sb, "failed to replay log file. Can't mount rw!"); + err = -EINVAL; + goto out; + } + + if ((sbi->volume.flags & VOLUME_FLAG_DIRTY) && !ro && !options->force) { + ntfs_warn(sb, "volume is dirty and "force" flag is not set!"); + err = -EINVAL; + goto out; }
/* Load $MFT. */ @@ -1173,7 +1217,7 @@ static int ntfs_fill_super(struct super_block *sb, struct fs_context *fc)
bad_len += len; bad_frags += 1; - if (sb_rdonly(sb)) + if (ro) continue;
if (wnd_set_used_safe(&sbi->used.bitmap, lcn, len, &tt) || tt) {