diff options
| -rw-r--r-- | fs/exfat/balloc.c | 28 | ||||
| -rw-r--r-- | fs/exfat/dir.c | 5 | ||||
| -rw-r--r-- | fs/exfat/exfat_fs.h | 5 | ||||
| -rw-r--r-- | fs/exfat/fatent.c | 6 | ||||
| -rw-r--r-- | fs/exfat/super.c | 11 |
5 files changed, 46 insertions, 9 deletions
diff --git a/fs/exfat/balloc.c b/fs/exfat/balloc.c index 2d2d510f2372..b387bf7df65e 100644 --- a/fs/exfat/balloc.c +++ b/fs/exfat/balloc.c @@ -183,11 +183,10 @@ void exfat_free_bitmap(struct exfat_sb_info *sbi) kvfree(sbi->vol_amap); } -int exfat_set_bitmap(struct inode *inode, unsigned int clu, bool sync) +int exfat_set_bitmap(struct super_block *sb, unsigned int clu, bool sync) { int i, b; unsigned int ent_idx; - struct super_block *sb = inode->i_sb; struct exfat_sb_info *sbi = EXFAT_SB(sb); if (!is_valid_cluster(sbi, clu)) @@ -202,11 +201,10 @@ int exfat_set_bitmap(struct inode *inode, unsigned int clu, bool sync) return 0; } -int exfat_clear_bitmap(struct inode *inode, unsigned int clu, bool sync) +int exfat_clear_bitmap(struct super_block *sb, unsigned int clu, bool sync) { int i, b; unsigned int ent_idx; - struct super_block *sb = inode->i_sb; struct exfat_sb_info *sbi = EXFAT_SB(sb); if (!is_valid_cluster(sbi, clu)) @@ -226,6 +224,28 @@ int exfat_clear_bitmap(struct inode *inode, unsigned int clu, bool sync) return 0; } +bool exfat_test_bitmap(struct super_block *sb, unsigned int clu) +{ + int i, b; + unsigned int ent_idx; + struct exfat_sb_info *sbi = EXFAT_SB(sb); + + if (!sbi->vol_amap) + return true; + + if (!is_valid_cluster(sbi, clu)) + return false; + + ent_idx = CLUSTER_TO_BITMAP_ENT(clu); + i = BITMAP_OFFSET_SECTOR_INDEX(sb, ent_idx); + b = BITMAP_OFFSET_BIT_IN_SECTOR(sb, ent_idx); + + if (!test_bit_le(b, sbi->vol_amap[i]->b_data)) + return false; + + return true; +} + /* * If the value of "clu" is 0, it means cluster 2 which is the first cluster of * the cluster heap. diff --git a/fs/exfat/dir.c b/fs/exfat/dir.c index 7229146fe2bf..3045a58e124a 100644 --- a/fs/exfat/dir.c +++ b/fs/exfat/dir.c @@ -604,6 +604,11 @@ static int exfat_find_location(struct super_block *sb, struct exfat_chain *p_dir if (ret) return ret; + if (!exfat_test_bitmap(sb, clu)) { + exfat_err(sb, "failed to test cluster bit(%u)", clu); + return -EIO; + } + /* byte offset in cluster */ off = EXFAT_CLU_OFFSET(off, sbi); diff --git a/fs/exfat/exfat_fs.h b/fs/exfat/exfat_fs.h index 38210fb6901c..176fef62574c 100644 --- a/fs/exfat/exfat_fs.h +++ b/fs/exfat/exfat_fs.h @@ -452,8 +452,9 @@ int exfat_count_num_clusters(struct super_block *sb, /* balloc.c */ int exfat_load_bitmap(struct super_block *sb); void exfat_free_bitmap(struct exfat_sb_info *sbi); -int exfat_set_bitmap(struct inode *inode, unsigned int clu, bool sync); -int exfat_clear_bitmap(struct inode *inode, unsigned int clu, bool sync); +int exfat_set_bitmap(struct super_block *sb, unsigned int clu, bool sync); +int exfat_clear_bitmap(struct super_block *sb, unsigned int clu, bool sync); +bool exfat_test_bitmap(struct super_block *sb, unsigned int clu); unsigned int exfat_find_free_bitmap(struct super_block *sb, unsigned int clu); int exfat_count_used_clusters(struct super_block *sb, unsigned int *ret_count); int exfat_trim_fs(struct inode *inode, struct fstrim_range *range); diff --git a/fs/exfat/fatent.c b/fs/exfat/fatent.c index 825083634ba2..c9c5f2e3a05e 100644 --- a/fs/exfat/fatent.c +++ b/fs/exfat/fatent.c @@ -205,7 +205,7 @@ static int __exfat_free_cluster(struct inode *inode, struct exfat_chain *p_chain cur_cmap_i = next_cmap_i; } - err = exfat_clear_bitmap(inode, clu, (sync && IS_DIRSYNC(inode))); + err = exfat_clear_bitmap(sb, clu, (sync && IS_DIRSYNC(inode))); if (err) break; clu++; @@ -233,7 +233,7 @@ static int __exfat_free_cluster(struct inode *inode, struct exfat_chain *p_chain cur_cmap_i = next_cmap_i; } - if (exfat_clear_bitmap(inode, clu, (sync && IS_DIRSYNC(inode)))) + if (exfat_clear_bitmap(sb, clu, (sync && IS_DIRSYNC(inode)))) break; if (sbi->options.discard) { @@ -409,7 +409,7 @@ int exfat_alloc_cluster(struct inode *inode, unsigned int num_alloc, } /* update allocation bitmap */ - if (exfat_set_bitmap(inode, new_clu, sync_bmap)) { + if (exfat_set_bitmap(sb, new_clu, sync_bmap)) { ret = -EIO; goto free_cluster; } diff --git a/fs/exfat/super.c b/fs/exfat/super.c index 74d451f732c7..bc03f47374d4 100644 --- a/fs/exfat/super.c +++ b/fs/exfat/super.c @@ -629,6 +629,17 @@ static int __exfat_fill_super(struct super_block *sb, goto free_bh; } + if (!exfat_test_bitmap(sb, sbi->root_dir)) { + exfat_warn(sb, "failed to test first cluster bit of root dir(%u)", + sbi->root_dir); + /* + * The first cluster bit of the root directory should never + * be unset except when storage is corrupted. This bit is + * set to allow operations after mount. + */ + exfat_set_bitmap(sb, sbi->root_dir, false); + } + ret = exfat_count_used_clusters(sb, &sbi->used_clusters); if (ret) { exfat_err(sb, "failed to scan clusters"); |