Commit 8331191e authored by Anton Altaparmakov's avatar Anton Altaparmakov

NTFS: 2.1.28 - Fix deadlock reported by Sergey Vlasov due to ntfs_put_inode().

- Fix deadlock in fs/ntfs/inode.c::ntfs_put_inode().  Thanks to Sergey
  Vlasov for the report and detailed analysis of the deadlock.  The fix
  involved getting rid of ntfs_put_inode() altogether and hence NTFS no
  longer has a ->put_inode super operation.
Signed-off-by: default avatarAnton Altaparmakov <aia21@cantab.net>
parent a8b34852
......@@ -457,6 +457,8 @@ ChangeLog
Note, a technical ChangeLog aimed at kernel hackers is in fs/ntfs/ChangeLog.
2.1.28:
- Fix a deadlock.
2.1.27:
- Implement page migration support so the kernel can move memory used
by NTFS files and directories around for management purposes.
......
......@@ -17,6 +17,13 @@ ToDo/Notes:
happen is unclear however so it is worth waiting until someone hits
the problem.
2.1.28 - Fix a deadlock.
- Fix deadlock in fs/ntfs/inode.c::ntfs_put_inode(). Thanks to Sergey
Vlasov for the report and detailed analysis of the deadlock. The fix
involved getting rid of ntfs_put_inode() altogether and hence NTFS no
longer has a ->put_inode super operation.
2.1.27 - Various bug fixes and cleanups.
- Fix two compiler warnings on Alpha. Thanks to Andrew Morton for
......
/**
* dir.c - NTFS kernel directory operations. Part of the Linux-NTFS project.
*
* Copyright (c) 2001-2005 Anton Altaparmakov
* Copyright (c) 2001-2007 Anton Altaparmakov
* Copyright (c) 2002 Richard Russon
*
* This program/include file is free software; you can redistribute it and/or
......@@ -1249,16 +1249,12 @@ skip_index_root:
/* Get the offset into the index allocation attribute. */
ia_pos = (s64)fpos - vol->mft_record_size;
ia_mapping = vdir->i_mapping;
bmp_vi = ndir->itype.index.bmp_ino;
if (unlikely(!bmp_vi)) {
ntfs_debug("Inode 0x%lx, regetting index bitmap.", vdir->i_ino);
bmp_vi = ntfs_attr_iget(vdir, AT_BITMAP, I30, 4);
if (IS_ERR(bmp_vi)) {
ntfs_error(sb, "Failed to get bitmap attribute.");
err = PTR_ERR(bmp_vi);
goto err_out;
}
ndir->itype.index.bmp_ino = bmp_vi;
ntfs_debug("Inode 0x%lx, getting index bitmap.", vdir->i_ino);
bmp_vi = ntfs_attr_iget(vdir, AT_BITMAP, I30, 4);
if (IS_ERR(bmp_vi)) {
ntfs_error(sb, "Failed to get bitmap attribute.");
err = PTR_ERR(bmp_vi);
goto err_out;
}
bmp_mapping = bmp_vi->i_mapping;
/* Get the starting bitmap bit position and sanity check it. */
......@@ -1266,7 +1262,7 @@ skip_index_root:
if (unlikely(bmp_pos >> 3 >= i_size_read(bmp_vi))) {
ntfs_error(sb, "Current index allocation position exceeds "
"index bitmap size.");
goto err_out;
goto iput_err_out;
}
/* Get the starting bit position in the current bitmap page. */
cur_bmp_pos = bmp_pos & ((PAGE_CACHE_SIZE * 8) - 1);
......@@ -1282,7 +1278,7 @@ get_next_bmp_page:
ntfs_error(sb, "Reading index bitmap failed.");
err = PTR_ERR(bmp_page);
bmp_page = NULL;
goto err_out;
goto iput_err_out;
}
bmp = (u8*)page_address(bmp_page);
/* Find next index block in use. */
......@@ -1429,6 +1425,7 @@ find_next_index_buffer:
/* @ia_page is already unlocked in this case. */
ntfs_unmap_page(ia_page);
ntfs_unmap_page(bmp_page);
iput(bmp_vi);
goto abort;
}
}
......@@ -1439,6 +1436,7 @@ unm_EOD:
ntfs_unmap_page(ia_page);
}
ntfs_unmap_page(bmp_page);
iput(bmp_vi);
EOD:
/* We are finished, set fpos to EOD. */
fpos = i_size + vol->mft_record_size;
......@@ -1455,8 +1453,11 @@ done:
filp->f_pos = fpos;
return 0;
err_out:
if (bmp_page)
if (bmp_page) {
ntfs_unmap_page(bmp_page);
iput_err_out:
iput(bmp_vi);
}
if (ia_page) {
unlock_page(ia_page);
ntfs_unmap_page(ia_page);
......@@ -1529,14 +1530,22 @@ static int ntfs_dir_open(struct inode *vi, struct file *filp)
static int ntfs_dir_fsync(struct file *filp, struct dentry *dentry,
int datasync)
{
struct inode *vi = dentry->d_inode;
ntfs_inode *ni = NTFS_I(vi);
struct inode *bmp_vi, *vi = dentry->d_inode;
int err, ret;
ntfs_attr na;
ntfs_debug("Entering for inode 0x%lx.", vi->i_ino);
BUG_ON(!S_ISDIR(vi->i_mode));
if (NInoIndexAllocPresent(ni) && ni->itype.index.bmp_ino)
write_inode_now(ni->itype.index.bmp_ino, !datasync);
/* If the bitmap attribute inode is in memory sync it, too. */
na.mft_no = vi->i_ino;
na.type = AT_BITMAP;
na.name = I30;
na.name_len = 4;
bmp_vi = ilookup5(vi->i_sb, vi->i_ino, (test_t)ntfs_test_inode, &na);
if (bmp_vi) {
write_inode_now(bmp_vi, !datasync);
iput(bmp_vi);
}
ret = ntfs_write_inode(vi, 1);
write_inode_now(vi, !datasync);
err = sync_blockdev(vi->i_sb->s_bdev);
......
/**
* inode.c - NTFS kernel inode handling. Part of the Linux-NTFS project.
*
* Copyright (c) 2001-2006 Anton Altaparmakov
* Copyright (c) 2001-2007 Anton Altaparmakov
*
* This program/include file is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as published
......@@ -95,7 +95,7 @@ int ntfs_test_inode(struct inode *vi, ntfs_attr *na)
* If initializing the normal file/directory inode, set @na->type to AT_UNUSED.
* In that case, @na->name and @na->name_len should be set to NULL and 0,
* respectively. Although that is not strictly necessary as
* ntfs_read_inode_locked() will fill them in later.
* ntfs_read_locked_inode() will fill them in later.
*
* Return 0 on success and -errno on error.
*
......@@ -171,8 +171,8 @@ static int ntfs_read_locked_index_inode(struct inode *base_vi,
struct inode *ntfs_iget(struct super_block *sb, unsigned long mft_no)
{
struct inode *vi;
ntfs_attr na;
int err;
ntfs_attr na;
na.mft_no = mft_no;
na.type = AT_UNUSED;
......@@ -229,8 +229,8 @@ struct inode *ntfs_attr_iget(struct inode *base_vi, ATTR_TYPE type,
ntfschar *name, u32 name_len)
{
struct inode *vi;
ntfs_attr na;
int err;
ntfs_attr na;
/* Make sure no one calls ntfs_attr_iget() for indices. */
BUG_ON(type == AT_INDEX_ALLOCATION);
......@@ -287,8 +287,8 @@ struct inode *ntfs_index_iget(struct inode *base_vi, ntfschar *name,
u32 name_len)
{
struct inode *vi;
ntfs_attr na;
int err;
ntfs_attr na;
na.mft_no = base_vi->i_ino;
na.type = AT_INDEX_ALLOCATION;
......@@ -402,7 +402,6 @@ void __ntfs_init_inode(struct super_block *sb, ntfs_inode *ni)
ntfs_init_runlist(&ni->attr_list_rl);
lockdep_set_class(&ni->attr_list_rl.lock,
&attr_list_rl_lock_class);
ni->itype.index.bmp_ino = NULL;
ni->itype.index.block_size = 0;
ni->itype.index.vcn_size = 0;
ni->itype.index.collation_rule = 0;
......@@ -546,6 +545,7 @@ static int ntfs_read_locked_inode(struct inode *vi)
{
ntfs_volume *vol = NTFS_SB(vi->i_sb);
ntfs_inode *ni;
struct inode *bvi;
MFT_RECORD *m;
ATTR_RECORD *a;
STANDARD_INFORMATION *si;
......@@ -780,7 +780,6 @@ skip_attr_list_load:
*/
if (S_ISDIR(vi->i_mode)) {
loff_t bvi_size;
struct inode *bvi;
ntfs_inode *bni;
INDEX_ROOT *ir;
u8 *ir_end, *index_end;
......@@ -985,13 +984,12 @@ skip_attr_list_load:
err = PTR_ERR(bvi);
goto unm_err_out;
}
ni->itype.index.bmp_ino = bvi;
bni = NTFS_I(bvi);
if (NInoCompressed(bni) || NInoEncrypted(bni) ||
NInoSparse(bni)) {
ntfs_error(vi->i_sb, "$BITMAP attribute is compressed "
"and/or encrypted and/or sparse.");
goto unm_err_out;
goto iput_unm_err_out;
}
/* Consistency check bitmap size vs. index allocation size. */
bvi_size = i_size_read(bvi);
......@@ -1000,8 +998,10 @@ skip_attr_list_load:
ntfs_error(vi->i_sb, "Index bitmap too small (0x%llx) "
"for index allocation (0x%llx).",
bvi_size << 3, vi->i_size);
goto unm_err_out;
goto iput_unm_err_out;
}
/* No longer need the bitmap attribute inode. */
iput(bvi);
skip_large_dir_stuff:
/* Setup the operations for this inode. */
vi->i_op = &ntfs_dir_inode_ops;
......@@ -1176,7 +1176,8 @@ no_data_attr_special_case:
vi->i_blocks = ni->allocated_size >> 9;
ntfs_debug("Done.");
return 0;
iput_unm_err_out:
iput(bvi);
unm_err_out:
if (!err)
err = -EIO;
......@@ -1697,7 +1698,7 @@ static int ntfs_read_locked_index_inode(struct inode *base_vi, struct inode *vi)
vi->i_size);
goto iput_unm_err_out;
}
ni->itype.index.bmp_ino = bvi;
iput(bvi);
skip_large_index_stuff:
/* Setup the operations for this index inode. */
vi->i_op = NULL;
......@@ -1714,7 +1715,6 @@ skip_large_index_stuff:
ntfs_debug("Done.");
return 0;
iput_unm_err_out:
iput(bvi);
unm_err_out:
......@@ -2191,37 +2191,6 @@ err_out:
return -1;
}
/**
* ntfs_put_inode - handler for when the inode reference count is decremented
* @vi: vfs inode
*
* The VFS calls ntfs_put_inode() every time the inode reference count (i_count)
* is about to be decremented (but before the decrement itself.
*
* If the inode @vi is a directory with two references, one of which is being
* dropped, we need to put the attribute inode for the directory index bitmap,
* if it is present, otherwise the directory inode would remain pinned for
* ever.
*/
void ntfs_put_inode(struct inode *vi)
{
if (S_ISDIR(vi->i_mode) && atomic_read(&vi->i_count) == 2) {
ntfs_inode *ni = NTFS_I(vi);
if (NInoIndexAllocPresent(ni)) {
struct inode *bvi = NULL;
mutex_lock(&vi->i_mutex);
if (atomic_read(&vi->i_count) == 2) {
bvi = ni->itype.index.bmp_ino;
if (bvi)
ni->itype.index.bmp_ino = NULL;
}
mutex_unlock(&vi->i_mutex);
if (bvi)
iput(bvi);
}
}
}
static void __ntfs_clear_inode(ntfs_inode *ni)
{
/* Free all alocated memory. */
......@@ -2287,18 +2256,6 @@ void ntfs_clear_big_inode(struct inode *vi)
{
ntfs_inode *ni = NTFS_I(vi);
/*
* If the inode @vi is an index inode we need to put the attribute
* inode for the index bitmap, if it is present, otherwise the index
* inode would disappear and the attribute inode for the index bitmap
* would no longer be referenced from anywhere and thus it would remain
* pinned for ever.
*/
if (NInoAttr(ni) && (ni->type == AT_INDEX_ALLOCATION) &&
NInoIndexAllocPresent(ni) && ni->itype.index.bmp_ino) {
iput(ni->itype.index.bmp_ino);
ni->itype.index.bmp_ino = NULL;
}
#ifdef NTFS_RW
if (NInoDirty(ni)) {
bool was_bad = (is_bad_inode(vi));
......
......@@ -2,7 +2,7 @@
* inode.h - Defines for inode structures NTFS Linux kernel driver. Part of
* the Linux-NTFS project.
*
* Copyright (c) 2001-2005 Anton Altaparmakov
* Copyright (c) 2001-2007 Anton Altaparmakov
* Copyright (c) 2002 Richard Russon
*
* This program/include file is free software; you can redistribute it and/or
......@@ -101,8 +101,6 @@ struct _ntfs_inode {
runlist attr_list_rl; /* Run list for the attribute list value. */
union {
struct { /* It is a directory, $MFT, or an index inode. */
struct inode *bmp_ino; /* Attribute inode for the
index $BITMAP. */
u32 block_size; /* Size of an index block. */
u32 vcn_size; /* Size of a vcn in this
index. */
......@@ -300,8 +298,6 @@ extern void ntfs_clear_extent_inode(ntfs_inode *ni);
extern int ntfs_read_inode_mount(struct inode *vi);
extern void ntfs_put_inode(struct inode *vi);
extern int ntfs_show_options(struct seq_file *sf, struct vfsmount *mnt);
#ifdef NTFS_RW
......
/*
* super.c - NTFS kernel super block handling. Part of the Linux-NTFS project.
*
* Copyright (c) 2001-2006 Anton Altaparmakov
* Copyright (c) 2001-2007 Anton Altaparmakov
* Copyright (c) 2001,2002 Richard Russon
*
* This program/include file is free software; you can redistribute it and/or
......@@ -2702,9 +2702,6 @@ static int ntfs_statfs(struct dentry *dentry, struct kstatfs *sfs)
static struct super_operations ntfs_sops = {
.alloc_inode = ntfs_alloc_big_inode, /* VFS: Allocate new inode. */
.destroy_inode = ntfs_destroy_big_inode, /* VFS: Deallocate inode. */
.put_inode = ntfs_put_inode, /* VFS: Called just before
the inode reference count
is decreased. */
#ifdef NTFS_RW
//.dirty_inode = NULL, /* VFS: Called from
// __mark_inode_dirty(). */
......@@ -3261,7 +3258,7 @@ static void __exit exit_ntfs_fs(void)
}
MODULE_AUTHOR("Anton Altaparmakov <aia21@cantab.net>");
MODULE_DESCRIPTION("NTFS 1.2/3.x driver - Copyright (c) 2001-2006 Anton Altaparmakov");
MODULE_DESCRIPTION("NTFS 1.2/3.x driver - Copyright (c) 2001-2007 Anton Altaparmakov");
MODULE_VERSION(NTFS_VERSION);
MODULE_LICENSE("GPL");
#ifdef DEBUG
......
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