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-rw-r--r--fs/hfsplus/brec.c4
-rw-r--r--fs/hfsplus/catalog.c14
-rw-r--r--fs/hfsplus/dir.c8
-rw-r--r--fs/hfsplus/extents.c50
-rw-r--r--fs/hfsplus/hfsplus_fs.h18
-rw-r--r--fs/hfsplus/inode.c12
-rw-r--r--fs/hfsplus/part_tbl.c32
-rw-r--r--fs/hfsplus/super.c43
-rw-r--r--fs/hfsplus/unicode.c35
-rw-r--r--fs/hfsplus/wrapper.c92
10 files changed, 219 insertions, 89 deletions
diff --git a/fs/hfsplus/brec.c b/fs/hfsplus/brec.c
index 2312de34bd42..2a734cfccc92 100644
--- a/fs/hfsplus/brec.c
+++ b/fs/hfsplus/brec.c
@@ -43,6 +43,10 @@ u16 hfs_brec_keylen(struct hfs_bnode *node, u16 rec)
node->tree->node_size - (rec + 1) * 2);
if (!recoff)
return 0;
+ if (recoff > node->tree->node_size - 2) {
+ printk(KERN_ERR "hfs: recoff %d too large\n", recoff);
+ return 0;
+ }
retval = hfs_bnode_read_u16(node, recoff) + 2;
if (retval > node->tree->max_key_len + 2) {
diff --git a/fs/hfsplus/catalog.c b/fs/hfsplus/catalog.c
index b4ba1b319333..4dfbfec357e8 100644
--- a/fs/hfsplus/catalog.c
+++ b/fs/hfsplus/catalog.c
@@ -212,7 +212,9 @@ int hfsplus_create_cat(u32 cnid, struct inode *dir,
dprint(DBG_CAT_MOD, "create_cat: %s,%u(%d)\n",
str->name, cnid, inode->i_nlink);
- hfs_find_init(HFSPLUS_SB(sb)->cat_tree, &fd);
+ err = hfs_find_init(HFSPLUS_SB(sb)->cat_tree, &fd);
+ if (err)
+ return err;
hfsplus_cat_build_key(sb, fd.search_key, cnid, NULL);
entry_size = hfsplus_fill_cat_thread(sb, &entry,
@@ -269,7 +271,9 @@ int hfsplus_delete_cat(u32 cnid, struct inode *dir, struct qstr *str)
dprint(DBG_CAT_MOD, "delete_cat: %s,%u\n",
str ? str->name : NULL, cnid);
- hfs_find_init(HFSPLUS_SB(sb)->cat_tree, &fd);
+ err = hfs_find_init(HFSPLUS_SB(sb)->cat_tree, &fd);
+ if (err)
+ return err;
if (!str) {
int len;
@@ -347,12 +351,14 @@ int hfsplus_rename_cat(u32 cnid,
struct hfs_find_data src_fd, dst_fd;
hfsplus_cat_entry entry;
int entry_size, type;
- int err = 0;
+ int err;
dprint(DBG_CAT_MOD, "rename_cat: %u - %lu,%s - %lu,%s\n",
cnid, src_dir->i_ino, src_name->name,
dst_dir->i_ino, dst_name->name);
- hfs_find_init(HFSPLUS_SB(sb)->cat_tree, &src_fd);
+ err = hfs_find_init(HFSPLUS_SB(sb)->cat_tree, &src_fd);
+ if (err)
+ return err;
dst_fd = src_fd;
/* find the old dir entry and read the data */
diff --git a/fs/hfsplus/dir.c b/fs/hfsplus/dir.c
index 4df5059c25da..25b2443a004c 100644
--- a/fs/hfsplus/dir.c
+++ b/fs/hfsplus/dir.c
@@ -38,7 +38,9 @@ static struct dentry *hfsplus_lookup(struct inode *dir, struct dentry *dentry,
sb = dir->i_sb;
dentry->d_fsdata = NULL;
- hfs_find_init(HFSPLUS_SB(sb)->cat_tree, &fd);
+ err = hfs_find_init(HFSPLUS_SB(sb)->cat_tree, &fd);
+ if (err)
+ return ERR_PTR(err);
hfsplus_cat_build_key(sb, fd.search_key, dir->i_ino, &dentry->d_name);
again:
err = hfs_brec_read(&fd, &entry, sizeof(entry));
@@ -132,7 +134,9 @@ static int hfsplus_readdir(struct file *filp, void *dirent, filldir_t filldir)
if (filp->f_pos >= inode->i_size)
return 0;
- hfs_find_init(HFSPLUS_SB(sb)->cat_tree, &fd);
+ err = hfs_find_init(HFSPLUS_SB(sb)->cat_tree, &fd);
+ if (err)
+ return err;
hfsplus_cat_build_key(sb, fd.search_key, inode->i_ino, NULL);
err = hfs_brec_find(&fd);
if (err)
diff --git a/fs/hfsplus/extents.c b/fs/hfsplus/extents.c
index b1991a2a08e0..5849e3ef35cc 100644
--- a/fs/hfsplus/extents.c
+++ b/fs/hfsplus/extents.c
@@ -119,22 +119,31 @@ static void __hfsplus_ext_write_extent(struct inode *inode,
set_bit(HFSPLUS_I_EXT_DIRTY, &hip->flags);
}
-static void hfsplus_ext_write_extent_locked(struct inode *inode)
+static int hfsplus_ext_write_extent_locked(struct inode *inode)
{
+ int res;
+
if (HFSPLUS_I(inode)->extent_state & HFSPLUS_EXT_DIRTY) {
struct hfs_find_data fd;
- hfs_find_init(HFSPLUS_SB(inode->i_sb)->ext_tree, &fd);
+ res = hfs_find_init(HFSPLUS_SB(inode->i_sb)->ext_tree, &fd);
+ if (res)
+ return res;
__hfsplus_ext_write_extent(inode, &fd);
hfs_find_exit(&fd);
}
+ return 0;
}
-void hfsplus_ext_write_extent(struct inode *inode)
+int hfsplus_ext_write_extent(struct inode *inode)
{
+ int res;
+
mutex_lock(&HFSPLUS_I(inode)->extents_lock);
- hfsplus_ext_write_extent_locked(inode);
+ res = hfsplus_ext_write_extent_locked(inode);
mutex_unlock(&HFSPLUS_I(inode)->extents_lock);
+
+ return res;
}
static inline int __hfsplus_ext_read_extent(struct hfs_find_data *fd,
@@ -194,9 +203,11 @@ static int hfsplus_ext_read_extent(struct inode *inode, u32 block)
block < hip->cached_start + hip->cached_blocks)
return 0;
- hfs_find_init(HFSPLUS_SB(inode->i_sb)->ext_tree, &fd);
- res = __hfsplus_ext_cache_extent(&fd, inode, block);
- hfs_find_exit(&fd);
+ res = hfs_find_init(HFSPLUS_SB(inode->i_sb)->ext_tree, &fd);
+ if (!res) {
+ res = __hfsplus_ext_cache_extent(&fd, inode, block);
+ hfs_find_exit(&fd);
+ }
return res;
}
@@ -209,6 +220,7 @@ int hfsplus_get_block(struct inode *inode, sector_t iblock,
struct hfsplus_inode_info *hip = HFSPLUS_I(inode);
int res = -EIO;
u32 ablock, dblock, mask;
+ sector_t sector;
int was_dirty = 0;
int shift;
@@ -255,10 +267,12 @@ int hfsplus_get_block(struct inode *inode, sector_t iblock,
done:
dprint(DBG_EXTENT, "get_block(%lu): %llu - %u\n",
inode->i_ino, (long long)iblock, dblock);
+
mask = (1 << sbi->fs_shift) - 1;
- map_bh(bh_result, sb,
- (dblock << sbi->fs_shift) + sbi->blockoffset +
- (iblock & mask));
+ sector = ((sector_t)dblock << sbi->fs_shift) +
+ sbi->blockoffset + (iblock & mask);
+ map_bh(bh_result, sb, sector);
+
if (create) {
set_buffer_new(bh_result);
hip->phys_size += sb->s_blocksize;
@@ -371,7 +385,9 @@ int hfsplus_free_fork(struct super_block *sb, u32 cnid,
if (total_blocks == blocks)
return 0;
- hfs_find_init(HFSPLUS_SB(sb)->ext_tree, &fd);
+ res = hfs_find_init(HFSPLUS_SB(sb)->ext_tree, &fd);
+ if (res)
+ return res;
do {
res = __hfsplus_ext_read_extent(&fd, ext_entry, cnid,
total_blocks, type);
@@ -469,7 +485,9 @@ out:
insert_extent:
dprint(DBG_EXTENT, "insert new extent\n");
- hfsplus_ext_write_extent_locked(inode);
+ res = hfsplus_ext_write_extent_locked(inode);
+ if (res)
+ goto out;
memset(hip->cached_extents, 0, sizeof(hfsplus_extent_rec));
hip->cached_extents[0].start_block = cpu_to_be32(start);
@@ -500,7 +518,6 @@ void hfsplus_file_truncate(struct inode *inode)
struct page *page;
void *fsdata;
u32 size = inode->i_size;
- int res;
res = pagecache_write_begin(NULL, mapping, size, 0,
AOP_FLAG_UNINTERRUPTIBLE,
@@ -523,7 +540,12 @@ void hfsplus_file_truncate(struct inode *inode)
goto out;
mutex_lock(&hip->extents_lock);
- hfs_find_init(HFSPLUS_SB(sb)->ext_tree, &fd);
+ res = hfs_find_init(HFSPLUS_SB(sb)->ext_tree, &fd);
+ if (res) {
+ mutex_unlock(&hip->extents_lock);
+ /* XXX: We lack error handling of hfsplus_file_truncate() */
+ return;
+ }
while (1) {
if (alloc_cnt == hip->first_blocks) {
hfsplus_free_extents(sb, hip->first_extents,
diff --git a/fs/hfsplus/hfsplus_fs.h b/fs/hfsplus/hfsplus_fs.h
index d6857523336d..81dfd1e495e3 100644
--- a/fs/hfsplus/hfsplus_fs.h
+++ b/fs/hfsplus/hfsplus_fs.h
@@ -13,6 +13,7 @@
#include <linux/fs.h>
#include <linux/mutex.h>
#include <linux/buffer_head.h>
+#include <linux/blkdev.h>
#include "hfsplus_raw.h"
#define DBG_BNODE_REFS 0x00000001
@@ -110,7 +111,9 @@ struct hfsplus_vh;
struct hfs_btree;
struct hfsplus_sb_info {
+ void *s_vhdr_buf;
struct hfsplus_vh *s_vhdr;
+ void *s_backup_vhdr_buf;
struct hfsplus_vh *s_backup_vhdr;
struct hfs_btree *ext_tree;
struct hfs_btree *cat_tree;
@@ -258,6 +261,15 @@ struct hfsplus_readdir_data {
struct hfsplus_cat_key key;
};
+/*
+ * Find minimum acceptible I/O size for an hfsplus sb.
+ */
+static inline unsigned short hfsplus_min_io_size(struct super_block *sb)
+{
+ return max_t(unsigned short, bdev_logical_block_size(sb->s_bdev),
+ HFSPLUS_SECTOR_SIZE);
+}
+
#define hfs_btree_open hfsplus_btree_open
#define hfs_btree_close hfsplus_btree_close
#define hfs_btree_write hfsplus_btree_write
@@ -374,7 +386,7 @@ extern const struct file_operations hfsplus_dir_operations;
/* extents.c */
int hfsplus_ext_cmp_key(const hfsplus_btree_key *, const hfsplus_btree_key *);
-void hfsplus_ext_write_extent(struct inode *);
+int hfsplus_ext_write_extent(struct inode *);
int hfsplus_get_block(struct inode *, sector_t, struct buffer_head *, int);
int hfsplus_free_fork(struct super_block *, u32,
struct hfsplus_fork_raw *, int);
@@ -436,8 +448,8 @@ int hfsplus_compare_dentry(const struct dentry *parent,
/* wrapper.c */
int hfsplus_read_wrapper(struct super_block *);
int hfs_part_find(struct super_block *, sector_t *, sector_t *);
-int hfsplus_submit_bio(struct block_device *bdev, sector_t sector,
- void *data, int rw);
+int hfsplus_submit_bio(struct super_block *sb, sector_t sector,
+ void *buf, void **data, int rw);
/* time macros */
#define __hfsp_mt2ut(t) (be32_to_cpu(t) - 2082844800U)
diff --git a/fs/hfsplus/inode.c b/fs/hfsplus/inode.c
index b248a6cfcad9..010cd363d085 100644
--- a/fs/hfsplus/inode.c
+++ b/fs/hfsplus/inode.c
@@ -195,11 +195,13 @@ static struct dentry *hfsplus_file_lookup(struct inode *dir,
hip->flags = 0;
set_bit(HFSPLUS_I_RSRC, &hip->flags);
- hfs_find_init(HFSPLUS_SB(sb)->cat_tree, &fd);
- err = hfsplus_find_cat(sb, dir->i_ino, &fd);
- if (!err)
- err = hfsplus_cat_read_inode(inode, &fd);
- hfs_find_exit(&fd);
+ err = hfs_find_init(HFSPLUS_SB(sb)->cat_tree, &fd);
+ if (!err) {
+ err = hfsplus_find_cat(sb, dir->i_ino, &fd);
+ if (!err)
+ err = hfsplus_cat_read_inode(inode, &fd);
+ hfs_find_exit(&fd);
+ }
if (err) {
iput(inode);
return ERR_PTR(err);
diff --git a/fs/hfsplus/part_tbl.c b/fs/hfsplus/part_tbl.c
index 40ad88c12c64..eb355d81e279 100644
--- a/fs/hfsplus/part_tbl.c
+++ b/fs/hfsplus/part_tbl.c
@@ -88,11 +88,12 @@ static int hfs_parse_old_pmap(struct super_block *sb, struct old_pmap *pm,
return -ENOENT;
}
-static int hfs_parse_new_pmap(struct super_block *sb, struct new_pmap *pm,
- sector_t *part_start, sector_t *part_size)
+static int hfs_parse_new_pmap(struct super_block *sb, void *buf,
+ struct new_pmap *pm, sector_t *part_start, sector_t *part_size)
{
struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb);
int size = be32_to_cpu(pm->pmMapBlkCnt);
+ int buf_size = hfsplus_min_io_size(sb);
int res;
int i = 0;
@@ -107,11 +108,14 @@ static int hfs_parse_new_pmap(struct super_block *sb, struct new_pmap *pm,
if (++i >= size)
return -ENOENT;
- res = hfsplus_submit_bio(sb->s_bdev,
- *part_start + HFS_PMAP_BLK + i,
- pm, READ);
- if (res)
- return res;
+ pm = (struct new_pmap *)((u8 *)pm + HFSPLUS_SECTOR_SIZE);
+ if ((u8 *)pm - (u8 *)buf >= buf_size) {
+ res = hfsplus_submit_bio(sb,
+ *part_start + HFS_PMAP_BLK + i,
+ buf, (void **)&pm, READ);
+ if (res)
+ return res;
+ }
} while (pm->pmSig == cpu_to_be16(HFS_NEW_PMAP_MAGIC));
return -ENOENT;
@@ -124,15 +128,15 @@ static int hfs_parse_new_pmap(struct super_block *sb, struct new_pmap *pm,
int hfs_part_find(struct super_block *sb,
sector_t *part_start, sector_t *part_size)
{
- void *data;
+ void *buf, *data;
int res;
- data = kmalloc(HFSPLUS_SECTOR_SIZE, GFP_KERNEL);
- if (!data)
+ buf = kmalloc(hfsplus_min_io_size(sb), GFP_KERNEL);
+ if (!buf)
return -ENOMEM;
- res = hfsplus_submit_bio(sb->s_bdev, *part_start + HFS_PMAP_BLK,
- data, READ);
+ res = hfsplus_submit_bio(sb, *part_start + HFS_PMAP_BLK,
+ buf, &data, READ);
if (res)
goto out;
@@ -141,13 +145,13 @@ int hfs_part_find(struct super_block *sb,
res = hfs_parse_old_pmap(sb, data, part_start, part_size);
break;
case HFS_NEW_PMAP_MAGIC:
- res = hfs_parse_new_pmap(sb, data, part_start, part_size);
+ res = hfs_parse_new_pmap(sb, buf, data, part_start, part_size);
break;
default:
res = -ENOENT;
break;
}
out:
- kfree(data);
+ kfree(buf);
return res;
}
diff --git a/fs/hfsplus/super.c b/fs/hfsplus/super.c
index 84a47b709f51..c106ca22e812 100644
--- a/fs/hfsplus/super.c
+++ b/fs/hfsplus/super.c
@@ -73,11 +73,13 @@ struct inode *hfsplus_iget(struct super_block *sb, unsigned long ino)
if (inode->i_ino >= HFSPLUS_FIRSTUSER_CNID ||
inode->i_ino == HFSPLUS_ROOT_CNID) {
- hfs_find_init(HFSPLUS_SB(inode->i_sb)->cat_tree, &fd);
- err = hfsplus_find_cat(inode->i_sb, inode->i_ino, &fd);
- if (!err)
- err = hfsplus_cat_read_inode(inode, &fd);
- hfs_find_exit(&fd);
+ err = hfs_find_init(HFSPLUS_SB(inode->i_sb)->cat_tree, &fd);
+ if (!err) {
+ err = hfsplus_find_cat(inode->i_sb, inode->i_ino, &fd);
+ if (!err)
+ err = hfsplus_cat_read_inode(inode, &fd);
+ hfs_find_exit(&fd);
+ }
} else {
err = hfsplus_system_read_inode(inode);
}
@@ -133,9 +135,13 @@ static int hfsplus_system_write_inode(struct inode *inode)
static int hfsplus_write_inode(struct inode *inode,
struct writeback_control *wbc)
{
+ int err;
+
dprint(DBG_INODE, "hfsplus_write_inode: %lu\n", inode->i_ino);
- hfsplus_ext_write_extent(inode);
+ err = hfsplus_ext_write_extent(inode);
+ if (err)
+ return err;
if (inode->i_ino >= HFSPLUS_FIRSTUSER_CNID ||
inode->i_ino == HFSPLUS_ROOT_CNID)
@@ -197,17 +203,17 @@ int hfsplus_sync_fs(struct super_block *sb, int wait)
write_backup = 1;
}
- error2 = hfsplus_submit_bio(sb->s_bdev,
+ error2 = hfsplus_submit_bio(sb,
sbi->part_start + HFSPLUS_VOLHEAD_SECTOR,
- sbi->s_vhdr, WRITE_SYNC);
+ sbi->s_vhdr_buf, NULL, WRITE_SYNC);
if (!error)
error = error2;
if (!write_backup)
goto out;
- error2 = hfsplus_submit_bio(sb->s_bdev,
+ error2 = hfsplus_submit_bio(sb,
sbi->part_start + sbi->sect_count - 2,
- sbi->s_backup_vhdr, WRITE_SYNC);
+ sbi->s_backup_vhdr_buf, NULL, WRITE_SYNC);
if (!error)
error2 = error;
out:
@@ -251,8 +257,8 @@ static void hfsplus_put_super(struct super_block *sb)
hfs_btree_close(sbi->ext_tree);
iput(sbi->alloc_file);
iput(sbi->hidden_dir);
- kfree(sbi->s_vhdr);
- kfree(sbi->s_backup_vhdr);
+ kfree(sbi->s_vhdr_buf);
+ kfree(sbi->s_backup_vhdr_buf);
unload_nls(sbi->nls);
kfree(sb->s_fs_info);
sb->s_fs_info = NULL;
@@ -393,6 +399,13 @@ static int hfsplus_fill_super(struct super_block *sb, void *data, int silent)
if (!sbi->rsrc_clump_blocks)
sbi->rsrc_clump_blocks = 1;
+ err = generic_check_addressable(sbi->alloc_blksz_shift,
+ sbi->total_blocks);
+ if (err) {
+ printk(KERN_ERR "hfs: filesystem size too large.\n");
+ goto out_free_vhdr;
+ }
+
/* Set up operations so we can load metadata */
sb->s_op = &hfsplus_sops;
sb->s_maxbytes = MAX_LFS_FILESIZE;
@@ -417,6 +430,8 @@ static int hfsplus_fill_super(struct super_block *sb, void *data, int silent)
sb->s_flags |= MS_RDONLY;
}
+ err = -EINVAL;
+
/* Load metadata objects (B*Trees) */
sbi->ext_tree = hfs_btree_open(sb, HFSPLUS_EXT_CNID);
if (!sbi->ext_tree) {
@@ -447,7 +462,9 @@ static int hfsplus_fill_super(struct super_block *sb, void *data, int silent)
str.len = sizeof(HFSP_HIDDENDIR_NAME) - 1;
str.name = HFSP_HIDDENDIR_NAME;
- hfs_find_init(sbi->cat_tree, &fd);
+ err = hfs_find_init(sbi->cat_tree, &fd);
+ if (err)
+ goto out_put_root;
hfsplus_cat_build_key(sb, fd.search_key, HFSPLUS_ROOT_CNID, &str);
if (!hfs_brec_read(&fd, &entry, sizeof(entry))) {
hfs_find_exit(&fd);
diff --git a/fs/hfsplus/unicode.c b/fs/hfsplus/unicode.c
index a3f0bfcc881e..a32998f29f0b 100644
--- a/fs/hfsplus/unicode.c
+++ b/fs/hfsplus/unicode.c
@@ -142,7 +142,11 @@ int hfsplus_uni2asc(struct super_block *sb,
/* search for single decomposed char */
if (likely(compose))
ce1 = hfsplus_compose_lookup(hfsplus_compose_table, c0);
- if (ce1 && (cc = ce1[0])) {
+ if (ce1)
+ cc = ce1[0];
+ else
+ cc = 0;
+ if (cc) {
/* start of a possibly decomposed Hangul char */
if (cc != 0xffff)
goto done;
@@ -209,7 +213,8 @@ int hfsplus_uni2asc(struct super_block *sb,
i++;
ce2 = ce1;
}
- if ((cc = ce2[0])) {
+ cc = ce2[0];
+ if (cc) {
ip += i;
ustrlen -= i;
goto done;
@@ -301,7 +306,11 @@ int hfsplus_asc2uni(struct super_block *sb, struct hfsplus_unistr *ustr,
while (outlen < HFSPLUS_MAX_STRLEN && len > 0) {
size = asc2unichar(sb, astr, len, &c);
- if (decompose && (dstr = decompose_unichar(c, &dsize))) {
+ if (decompose)
+ dstr = decompose_unichar(c, &dsize);
+ else
+ dstr = NULL;
+ if (dstr) {
if (outlen + dsize > HFSPLUS_MAX_STRLEN)
break;
do {
@@ -346,15 +355,23 @@ int hfsplus_hash_dentry(const struct dentry *dentry, const struct inode *inode,
astr += size;
len -= size;
- if (decompose && (dstr = decompose_unichar(c, &dsize))) {
+ if (decompose)
+ dstr = decompose_unichar(c, &dsize);
+ else
+ dstr = NULL;
+ if (dstr) {
do {
c2 = *dstr++;
- if (!casefold || (c2 = case_fold(c2)))
+ if (casefold)
+ c2 = case_fold(c2);
+ if (!casefold || c2)
hash = partial_name_hash(c2, hash);
} while (--dsize > 0);
} else {
c2 = c;
- if (!casefold || (c2 = case_fold(c2)))
+ if (casefold)
+ c2 = case_fold(c2);
+ if (!casefold || c2)
hash = partial_name_hash(c2, hash);
}
}
@@ -422,12 +439,14 @@ int hfsplus_compare_dentry(const struct dentry *parent,
c1 = *dstr1;
c2 = *dstr2;
if (casefold) {
- if (!(c1 = case_fold(c1))) {
+ c1 = case_fold(c1);
+ if (!c1) {
dstr1++;
dsize1--;
continue;
}
- if (!(c2 = case_fold(c2))) {
+ c2 = case_fold(c2);
+ if (!c2) {
dstr2++;
dsize2--;
continue;
diff --git a/fs/hfsplus/wrapper.c b/fs/hfsplus/wrapper.c
index 4ac88ff79aa6..10e515a0d452 100644
--- a/fs/hfsplus/wrapper.c
+++ b/fs/hfsplus/wrapper.c
@@ -31,25 +31,67 @@ static void hfsplus_end_io_sync(struct bio *bio, int err)
complete(bio->bi_private);
}
-int hfsplus_submit_bio(struct block_device *bdev, sector_t sector,
- void *data, int rw)
+/*
+ * hfsplus_submit_bio - Perfrom block I/O
+ * @sb: super block of volume for I/O
+ * @sector: block to read or write, for blocks of HFSPLUS_SECTOR_SIZE bytes
+ * @buf: buffer for I/O
+ * @data: output pointer for location of requested data
+ * @rw: direction of I/O
+ *
+ * The unit of I/O is hfsplus_min_io_size(sb), which may be bigger than
+ * HFSPLUS_SECTOR_SIZE, and @buf must be sized accordingly. On reads
+ * @data will return a pointer to the start of the requested sector,
+ * which may not be the same location as @buf.
+ *
+ * If @sector is not aligned to the bdev logical block size it will
+ * be rounded down. For writes this means that @buf should contain data
+ * that starts at the rounded-down address. As long as the data was
+ * read using hfsplus_submit_bio() and the same buffer is used things
+ * will work correctly.
+ */
+int hfsplus_submit_bio(struct super_block *sb, sector_t sector,
+ void *buf, void **data, int rw)
{
DECLARE_COMPLETION_ONSTACK(wait);
struct bio *bio;
int ret = 0;
+ unsigned int io_size;
+ loff_t start;
+ int offset;
+
+ /*
+ * Align sector to hardware sector size and find offset. We
+ * assume that io_size is a power of two, which _should_
+ * be true.
+ */
+ io_size = hfsplus_min_io_size(sb);
+ start = (loff_t)sector << HFSPLUS_SECTOR_SHIFT;
+ offset = start & (io_size - 1);
+ sector &= ~((io_size >> HFSPLUS_SECTOR_SHIFT) - 1);
bio = bio_alloc(GFP_NOIO, 1);
bio->bi_sector = sector;
- bio->bi_bdev = bdev;
+ bio->bi_bdev = sb->s_bdev;
bio->bi_end_io = hfsplus_end_io_sync;
bio->bi_private = &wait;
- /*
- * We always submit one sector at a time, so bio_add_page must not fail.
- */
- if (bio_add_page(bio, virt_to_page(data), HFSPLUS_SECTOR_SIZE,
- offset_in_page(data)) != HFSPLUS_SECTOR_SIZE)
- BUG();
+ if (!(rw & WRITE) && data)
+ *data = (u8 *)buf + offset;
+
+ while (io_size > 0) {
+ unsigned int page_offset = offset_in_page(buf);
+ unsigned int len = min_t(unsigned int, PAGE_SIZE - page_offset,
+ io_size);
+
+ ret = bio_add_page(bio, virt_to_page(buf), len, page_offset);
+ if (ret != len) {
+ ret = -EIO;
+ goto out;
+ }
+ io_size -= len;
+ buf = (u8 *)buf + len;
+ }
submit_bio(rw, bio);
wait_for_completion(&wait);
@@ -57,8 +99,9 @@ int hfsplus_submit_bio(struct block_device *bdev, sector_t sector,
if (!bio_flagged(bio, BIO_UPTODATE))
ret = -EIO;
+out:
bio_put(bio);
- return ret;
+ return ret < 0 ? ret : 0;
}
static int hfsplus_read_mdb(void *bufptr, struct hfsplus_wd *wd)
@@ -141,23 +184,19 @@ int hfsplus_read_wrapper(struct super_block *sb)
if (hfsplus_get_last_session(sb, &part_start, &part_size))
goto out;
- if ((u64)part_start + part_size > 0x100000000ULL) {
- pr_err("hfs: volumes larger than 2TB are not supported yet\n");
- goto out;
- }
error = -ENOMEM;
- sbi->s_vhdr = kmalloc(HFSPLUS_SECTOR_SIZE, GFP_KERNEL);
- if (!sbi->s_vhdr)
+ sbi->s_vhdr_buf = kmalloc(hfsplus_min_io_size(sb), GFP_KERNEL);
+ if (!sbi->s_vhdr_buf)
goto out;
- sbi->s_backup_vhdr = kmalloc(HFSPLUS_SECTOR_SIZE, GFP_KERNEL);
- if (!sbi->s_backup_vhdr)
+ sbi->s_backup_vhdr_buf = kmalloc(hfsplus_min_io_size(sb), GFP_KERNEL);
+ if (!sbi->s_backup_vhdr_buf)
goto out_free_vhdr;
reread:
- error = hfsplus_submit_bio(sb->s_bdev,
- part_start + HFSPLUS_VOLHEAD_SECTOR,
- sbi->s_vhdr, READ);
+ error = hfsplus_submit_bio(sb, part_start + HFSPLUS_VOLHEAD_SECTOR,
+ sbi->s_vhdr_buf, (void **)&sbi->s_vhdr,
+ READ);
if (error)
goto out_free_backup_vhdr;
@@ -172,8 +211,9 @@ reread:
if (!hfsplus_read_mdb(sbi->s_vhdr, &wd))
goto out_free_backup_vhdr;
wd.ablk_size >>= HFSPLUS_SECTOR_SHIFT;
- part_start += wd.ablk_start + wd.embed_start * wd.ablk_size;
- part_size = wd.embed_count * wd.ablk_size;
+ part_start += (sector_t)wd.ablk_start +
+ (sector_t)wd.embed_start * wd.ablk_size;
+ part_size = (sector_t)wd.embed_count * wd.ablk_size;
goto reread;
default:
/*
@@ -186,9 +226,9 @@ reread:
goto reread;
}
- error = hfsplus_submit_bio(sb->s_bdev,
- part_start + part_size - 2,
- sbi->s_backup_vhdr, READ);
+ error = hfsplus_submit_bio(sb, part_start + part_size - 2,
+ sbi->s_backup_vhdr_buf,
+ (void **)&sbi->s_backup_vhdr, READ);
if (error)
goto out_free_backup_vhdr;
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-22 05:29:55 +0000