From a64eefaac1c5cc8dbc6995228fe08a61b8e1d26b Mon Sep 17 00:00:00 2001 From: Mikulas Patocka Date: Wed, 2 Sep 2015 22:50:12 +0200 Subject: [PATCH 1/2] hpfs: support hotfixes When the OS/2 driver hits a disk write error, it writes the sector to another location and adds the sector mapping to the hotfix map. This patch makes the hpfs driver understand the hotfix map and remap accesses accoring to it. Signed-off-by: Mikulas Patocka Signed-off-by: Linus Torvalds --- fs/hpfs/buffer.c | 39 +++++++++++++++++++++++++++++++++------ fs/hpfs/file.c | 9 +++++++-- fs/hpfs/hpfs_fn.h | 7 +++++++ fs/hpfs/map.c | 26 ++++++++++++++++++++++++++ fs/hpfs/super.c | 15 +++------------ 5 files changed, 76 insertions(+), 20 deletions(-) diff --git a/fs/hpfs/buffer.c b/fs/hpfs/buffer.c index 8057fe4e6574..f626114449e4 100644 --- a/fs/hpfs/buffer.c +++ b/fs/hpfs/buffer.c @@ -10,6 +10,30 @@ #include #include "hpfs_fn.h" +secno hpfs_search_hotfix_map(struct super_block *s, secno sec) +{ + unsigned i; + struct hpfs_sb_info *sbi = hpfs_sb(s); + for (i = 0; unlikely(i < sbi->n_hotfixes); i++) { + if (sbi->hotfix_from[i] == sec) { + return sbi->hotfix_to[i]; + } + } + return sec; +} + +unsigned hpfs_search_hotfix_map_for_range(struct super_block *s, secno sec, unsigned n) +{ + unsigned i; + struct hpfs_sb_info *sbi = hpfs_sb(s); + for (i = 0; unlikely(i < sbi->n_hotfixes); i++) { + if (sbi->hotfix_from[i] >= sec && sbi->hotfix_from[i] < sec + n) { + n = sbi->hotfix_from[i] - sec; + } + } + return n; +} + void hpfs_prefetch_sectors(struct super_block *s, unsigned secno, int n) { struct buffer_head *bh; @@ -18,6 +42,9 @@ void hpfs_prefetch_sectors(struct super_block *s, unsigned secno, int n) if (n <= 0 || unlikely(secno >= hpfs_sb(s)->sb_fs_size)) return; + if (unlikely(hpfs_search_hotfix_map_for_range(s, secno, n) != n)) + return; + bh = sb_find_get_block(s, secno); if (bh) { if (buffer_uptodate(bh)) { @@ -51,7 +78,7 @@ void *hpfs_map_sector(struct super_block *s, unsigned secno, struct buffer_head cond_resched(); - *bhp = bh = sb_bread(s, secno); + *bhp = bh = sb_bread(s, hpfs_search_hotfix_map(s, secno)); if (bh != NULL) return bh->b_data; else { @@ -71,7 +98,7 @@ void *hpfs_get_sector(struct super_block *s, unsigned secno, struct buffer_head cond_resched(); - if ((*bhp = bh = sb_getblk(s, secno)) != NULL) { + if ((*bhp = bh = sb_getblk(s, hpfs_search_hotfix_map(s, secno))) != NULL) { if (!buffer_uptodate(bh)) wait_on_buffer(bh); set_buffer_uptodate(bh); return bh->b_data; @@ -99,10 +126,10 @@ void *hpfs_map_4sectors(struct super_block *s, unsigned secno, struct quad_buffe hpfs_prefetch_sectors(s, secno, 4 + ahead); - if (!(qbh->bh[0] = sb_bread(s, secno + 0))) goto bail0; - if (!(qbh->bh[1] = sb_bread(s, secno + 1))) goto bail1; - if (!(qbh->bh[2] = sb_bread(s, secno + 2))) goto bail2; - if (!(qbh->bh[3] = sb_bread(s, secno + 3))) goto bail3; + if (!hpfs_map_sector(s, secno + 0, &qbh->bh[0], 0)) goto bail0; + if (!hpfs_map_sector(s, secno + 1, &qbh->bh[1], 0)) goto bail1; + if (!hpfs_map_sector(s, secno + 2, &qbh->bh[2], 0)) goto bail2; + if (!hpfs_map_sector(s, secno + 3, &qbh->bh[3], 0)) goto bail3; if (likely(qbh->bh[1]->b_data == qbh->bh[0]->b_data + 1 * 512) && likely(qbh->bh[2]->b_data == qbh->bh[0]->b_data + 2 * 512) && diff --git a/fs/hpfs/file.c b/fs/hpfs/file.c index 7ca28d604bf7..d3bcdd975700 100644 --- a/fs/hpfs/file.c +++ b/fs/hpfs/file.c @@ -83,6 +83,11 @@ static int hpfs_get_block(struct inode *inode, sector_t iblock, struct buffer_he if (s) { if (bh_result->b_size >> 9 < n_secs) n_secs = bh_result->b_size >> 9; + n_secs = hpfs_search_hotfix_map_for_range(inode->i_sb, s, n_secs); + if (unlikely(!n_secs)) { + s = hpfs_search_hotfix_map(inode->i_sb, s); + n_secs = 1; + } map_bh(bh_result, inode->i_sb, s); bh_result->b_size = n_secs << 9; goto ret_0; @@ -101,7 +106,7 @@ static int hpfs_get_block(struct inode *inode, sector_t iblock, struct buffer_he inode->i_blocks++; hpfs_i(inode)->mmu_private += 512; set_buffer_new(bh_result); - map_bh(bh_result, inode->i_sb, s); + map_bh(bh_result, inode->i_sb, hpfs_search_hotfix_map(inode->i_sb, s)); ret_0: r = 0; ret_r: @@ -181,7 +186,7 @@ static int hpfs_write_end(struct file *file, struct address_space *mapping, static sector_t _hpfs_bmap(struct address_space *mapping, sector_t block) { - return generic_block_bmap(mapping,block,hpfs_get_block); + return generic_block_bmap(mapping, block, hpfs_get_block); } const struct address_space_operations hpfs_aops = { diff --git a/fs/hpfs/hpfs_fn.h b/fs/hpfs/hpfs_fn.h index c4867b5116dd..975654a63c13 100644 --- a/fs/hpfs/hpfs_fn.h +++ b/fs/hpfs/hpfs_fn.h @@ -88,6 +88,10 @@ struct hpfs_sb_info { unsigned sb_max_fwd_alloc; /* max forwad allocation */ int sb_timeshift; struct rcu_head rcu; + + unsigned n_hotfixes; + secno hotfix_from[256]; + secno hotfix_to[256]; }; /* Four 512-byte buffers and the 2k block obtained by concatenating them */ @@ -217,6 +221,8 @@ void hpfs_remove_fnode(struct super_block *, fnode_secno fno); /* buffer.c */ +secno hpfs_search_hotfix_map(struct super_block *s, secno sec); +unsigned hpfs_search_hotfix_map_for_range(struct super_block *s, secno sec, unsigned n); void hpfs_prefetch_sectors(struct super_block *, unsigned, int); void *hpfs_map_sector(struct super_block *, unsigned, struct buffer_head **, int); void *hpfs_get_sector(struct super_block *, unsigned, struct buffer_head **); @@ -285,6 +291,7 @@ __le32 *hpfs_map_bitmap(struct super_block *, unsigned, struct quad_buffer_head void hpfs_prefetch_bitmap(struct super_block *, unsigned); unsigned char *hpfs_load_code_page(struct super_block *, secno); __le32 *hpfs_load_bitmap_directory(struct super_block *, secno bmp); +void hpfs_load_hotfix_map(struct super_block *s, struct hpfs_spare_block *spareblock); struct fnode *hpfs_map_fnode(struct super_block *s, ino_t, struct buffer_head **); struct anode *hpfs_map_anode(struct super_block *s, anode_secno, struct buffer_head **); struct dnode *hpfs_map_dnode(struct super_block *s, dnode_secno, struct quad_buffer_head *); diff --git a/fs/hpfs/map.c b/fs/hpfs/map.c index 442770edcdc7..a69bbc1e87f8 100644 --- a/fs/hpfs/map.c +++ b/fs/hpfs/map.c @@ -130,6 +130,32 @@ __le32 *hpfs_load_bitmap_directory(struct super_block *s, secno bmp) return b; } +void hpfs_load_hotfix_map(struct super_block *s, struct hpfs_spare_block *spareblock) +{ + struct quad_buffer_head qbh; + u32 *directory; + u32 n_hotfixes, n_used_hotfixes; + unsigned i; + + n_hotfixes = le32_to_cpu(spareblock->n_spares); + n_used_hotfixes = le32_to_cpu(spareblock->n_spares_used); + + if (n_hotfixes > 256 || n_used_hotfixes > n_hotfixes) { + hpfs_error(s, "invalid number of hotfixes: %u, used: %u", n_hotfixes, n_used_hotfixes); + return; + } + if (!(directory = hpfs_map_4sectors(s, le32_to_cpu(spareblock->hotfix_map), &qbh, 0))) { + hpfs_error(s, "can't load hotfix map"); + return; + } + for (i = 0; i < n_used_hotfixes; i++) { + hpfs_sb(s)->hotfix_from[i] = le32_to_cpu(directory[i]); + hpfs_sb(s)->hotfix_to[i] = le32_to_cpu(directory[n_hotfixes + i]); + } + hpfs_sb(s)->n_hotfixes = n_used_hotfixes; + hpfs_brelse4(&qbh); +} + /* * Load fnode to memory */ diff --git a/fs/hpfs/super.c b/fs/hpfs/super.c index 68a9bed05628..a561591896bd 100644 --- a/fs/hpfs/super.c +++ b/fs/hpfs/super.c @@ -628,6 +628,9 @@ static int hpfs_fill_super(struct super_block *s, void *options, int silent) goto bail4; } + if (spareblock->n_spares_used) + hpfs_load_hotfix_map(s, spareblock); + /* Load bitmap directory */ if (!(sbi->sb_bmp_dir = hpfs_load_bitmap_directory(s, le32_to_cpu(superblock->bitmaps)))) goto bail4; @@ -647,18 +650,6 @@ static int hpfs_fill_super(struct super_block *s, void *options, int silent) mark_buffer_dirty(bh2); } - if (spareblock->hotfixes_used || spareblock->n_spares_used) { - if (errs >= 2) { - pr_err("Hotfixes not supported here, try chkdsk\n"); - mark_dirty(s, 0); - goto bail4; - } - hpfs_error(s, "hotfixes not supported here, try chkdsk"); - if (errs == 0) - pr_err("Proceeding, but your filesystem will be probably corrupted by this driver...\n"); - else - pr_err("This driver may read bad files or crash when operating on disk with hotfixes.\n"); - } if (le32_to_cpu(spareblock->n_dnode_spares) != le32_to_cpu(spareblock->n_dnode_spares_free)) { if (errs >= 2) { pr_err("Spare dnodes used, try chkdsk\n"); From f49a26e7718dd30b49e3541e3e25aecf5e7294e2 Mon Sep 17 00:00:00 2001 From: Mikulas Patocka Date: Wed, 2 Sep 2015 22:51:53 +0200 Subject: [PATCH 2/2] hpfs: update ctime and mtime on directory modification Update ctime and mtime when a directory is modified. (though OS/2 doesn't update them anyway) Signed-off-by: Mikulas Patocka Cc: stable@kernel.org # v3.3+ Signed-off-by: Linus Torvalds --- fs/hpfs/namei.c | 25 ++++++++++++++++++++++++- 1 file changed, 24 insertions(+), 1 deletion(-) diff --git a/fs/hpfs/namei.c b/fs/hpfs/namei.c index a0872f239f04..9e92c9c2d319 100644 --- a/fs/hpfs/namei.c +++ b/fs/hpfs/namei.c @@ -8,6 +8,17 @@ #include #include "hpfs_fn.h" +static void hpfs_update_directory_times(struct inode *dir) +{ + time_t t = get_seconds(); + if (t == dir->i_mtime.tv_sec && + t == dir->i_ctime.tv_sec) + return; + dir->i_mtime.tv_sec = dir->i_ctime.tv_sec = t; + dir->i_mtime.tv_nsec = dir->i_ctime.tv_nsec = 0; + hpfs_write_inode_nolock(dir); +} + static int hpfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) { const unsigned char *name = dentry->d_name.name; @@ -99,6 +110,7 @@ static int hpfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) result->i_mode = mode | S_IFDIR; hpfs_write_inode_nolock(result); } + hpfs_update_directory_times(dir); d_instantiate(dentry, result); hpfs_unlock(dir->i_sb); return 0; @@ -187,6 +199,7 @@ static int hpfs_create(struct inode *dir, struct dentry *dentry, umode_t mode, b result->i_mode = mode | S_IFREG; hpfs_write_inode_nolock(result); } + hpfs_update_directory_times(dir); d_instantiate(dentry, result); hpfs_unlock(dir->i_sb); return 0; @@ -262,6 +275,7 @@ static int hpfs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, de insert_inode_hash(result); hpfs_write_inode_nolock(result); + hpfs_update_directory_times(dir); d_instantiate(dentry, result); brelse(bh); hpfs_unlock(dir->i_sb); @@ -340,6 +354,7 @@ static int hpfs_symlink(struct inode *dir, struct dentry *dentry, const char *sy insert_inode_hash(result); hpfs_write_inode_nolock(result); + hpfs_update_directory_times(dir); d_instantiate(dentry, result); hpfs_unlock(dir->i_sb); return 0; @@ -423,6 +438,8 @@ static int hpfs_unlink(struct inode *dir, struct dentry *dentry) out1: hpfs_brelse4(&qbh); out: + if (!err) + hpfs_update_directory_times(dir); hpfs_unlock(dir->i_sb); return err; } @@ -477,6 +494,8 @@ static int hpfs_rmdir(struct inode *dir, struct dentry *dentry) out1: hpfs_brelse4(&qbh); out: + if (!err) + hpfs_update_directory_times(dir); hpfs_unlock(dir->i_sb); return err; } @@ -595,7 +614,7 @@ static int hpfs_rename(struct inode *old_dir, struct dentry *old_dentry, goto end1; } - end: +end: hpfs_i(i)->i_parent_dir = new_dir->i_ino; if (S_ISDIR(i->i_mode)) { inc_nlink(new_dir); @@ -610,6 +629,10 @@ static int hpfs_rename(struct inode *old_dir, struct dentry *old_dentry, brelse(bh); } end1: + if (!err) { + hpfs_update_directory_times(old_dir); + hpfs_update_directory_times(new_dir); + } hpfs_unlock(i->i_sb); return err; }