mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-15 07:36:42 +07:00
ocfs2: protect extent tree in ocfs2_prepare_inode_for_write()
When the extent tree is modified, it should be protected by inode cluster lock and ip_alloc_sem. The extent tree is accessed and modified in the ocfs2_prepare_inode_for_write, but isn't protected by ip_alloc_sem. The following is a case. The function ocfs2_fiemap is accessing the extent tree, which is modified at the same time. kernel BUG at fs/ocfs2/extent_map.c:475! invalid opcode: 0000 [#1] SMP Modules linked in: tun ocfs2 ocfs2_nodemanager configfs ocfs2_stackglue [...] CPU: 16 PID: 14047 Comm: o2info Not tainted 4.1.12-124.23.1.el6uek.x86_64 #2 Hardware name: Oracle Corporation ORACLE SERVER X7-2L/ASM, MB MECH, X7-2L, BIOS 42040600 10/19/2018 task: ffff88019487e200 ti: ffff88003daa4000 task.ti: ffff88003daa4000 RIP: ocfs2_get_clusters_nocache.isra.11+0x390/0x550 [ocfs2] Call Trace: ocfs2_fiemap+0x1e3/0x430 [ocfs2] do_vfs_ioctl+0x155/0x510 SyS_ioctl+0x81/0xa0 system_call_fastpath+0x18/0xd8 Code: 18 48 c7 c6 60 7f 65 a0 31 c0 bb e2 ff ff ff 48 8b 4a 40 48 8b 7a 28 48 c7 c2 78 2d 66 a0 e8 38 4f 05 00 e9 28 fe ff ff 0f 1f 00 <0f> 0b 66 0f 1f 44 00 00 bb 86 ff ff ff e9 13 fe ff ff 66 0f 1f RIP ocfs2_get_clusters_nocache.isra.11+0x390/0x550 [ocfs2] ---[ end trace c8aa0c8180e869dc ]--- Kernel panic - not syncing: Fatal exception Kernel Offset: disabled This issue can be reproduced every week in a production environment. This issue is related to the usage mode. If others use ocfs2 in this mode, the kernel will panic frequently. [akpm@linux-foundation.org: coding style fixes] [Fix new warning due to unused function by removing said function - Linus ] Link: http://lkml.kernel.org/r/1568772175-2906-2-git-send-email-sunny.s.zhang@oracle.com Signed-off-by: Shuning Zhang <sunny.s.zhang@oracle.com> Reviewed-by: Junxiao Bi <junxiao.bi@oracle.com> Reviewed-by: Gang He <ghe@suse.com> Cc: Mark Fasheh <mark@fasheh.com> Cc: Joel Becker <jlbec@evilplan.org> Cc: Joseph Qi <jiangqi903@gmail.com> Cc: Changwei Ge <gechangwei@live.cn> Cc: Jun Piao <piaojun@huawei.com> Cc: <stable@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Shuning Zhang
Linus Torvalds
parent
169226f7e0
commit
e74540b285
136
fs/ocfs2/file.c
136
fs/ocfs2/file.c
@ -2098,53 +2098,89 @@ static int ocfs2_is_io_unaligned(struct inode *inode, size_t count, loff_t pos)
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int ocfs2_prepare_inode_for_refcount(struct inode *inode,
|
||||
struct file *file,
|
||||
loff_t pos, size_t count,
|
||||
int *meta_level)
|
||||
static int ocfs2_inode_lock_for_extent_tree(struct inode *inode,
|
||||
struct buffer_head **di_bh,
|
||||
int meta_level,
|
||||
int overwrite_io,
|
||||
int write_sem,
|
||||
int wait)
|
||||
{
|
||||
int ret;
|
||||
struct buffer_head *di_bh = NULL;
|
||||
u32 cpos = pos >> OCFS2_SB(inode->i_sb)->s_clustersize_bits;
|
||||
u32 clusters =
|
||||
ocfs2_clusters_for_bytes(inode->i_sb, pos + count) - cpos;
|
||||
int ret = 0;
|
||||
|
||||
ret = ocfs2_inode_lock(inode, &di_bh, 1);
|
||||
if (ret) {
|
||||
mlog_errno(ret);
|
||||
if (wait)
|
||||
ret = ocfs2_inode_lock(inode, NULL, meta_level);
|
||||
else
|
||||
ret = ocfs2_try_inode_lock(inode,
|
||||
overwrite_io ? NULL : di_bh, meta_level);
|
||||
if (ret < 0)
|
||||
goto out;
|
||||
|
||||
if (wait) {
|
||||
if (write_sem)
|
||||
down_write(&OCFS2_I(inode)->ip_alloc_sem);
|
||||
else
|
||||
down_read(&OCFS2_I(inode)->ip_alloc_sem);
|
||||
} else {
|
||||
if (write_sem)
|
||||
ret = down_write_trylock(&OCFS2_I(inode)->ip_alloc_sem);
|
||||
else
|
||||
ret = down_read_trylock(&OCFS2_I(inode)->ip_alloc_sem);
|
||||
|
||||
if (!ret) {
|
||||
ret = -EAGAIN;
|
||||
goto out_unlock;
|
||||
}
|
||||
}
|
||||
|
||||
*meta_level = 1;
|
||||
|
||||
ret = ocfs2_refcount_cow(inode, di_bh, cpos, clusters, UINT_MAX);
|
||||
if (ret)
|
||||
mlog_errno(ret);
|
||||
out:
|
||||
brelse(di_bh);
|
||||
return ret;
|
||||
|
||||
out_unlock:
|
||||
brelse(*di_bh);
|
||||
ocfs2_inode_unlock(inode, meta_level);
|
||||
out:
|
||||
return ret;
|
||||
}
|
||||
|
||||
static void ocfs2_inode_unlock_for_extent_tree(struct inode *inode,
|
||||
struct buffer_head **di_bh,
|
||||
int meta_level,
|
||||
int write_sem)
|
||||
{
|
||||
if (write_sem)
|
||||
up_write(&OCFS2_I(inode)->ip_alloc_sem);
|
||||
else
|
||||
up_read(&OCFS2_I(inode)->ip_alloc_sem);
|
||||
|
||||
brelse(*di_bh);
|
||||
*di_bh = NULL;
|
||||
|
||||
if (meta_level >= 0)
|
||||
ocfs2_inode_unlock(inode, meta_level);
|
||||
}
|
||||
|
||||
static int ocfs2_prepare_inode_for_write(struct file *file,
|
||||
loff_t pos, size_t count, int wait)
|
||||
{
|
||||
int ret = 0, meta_level = 0, overwrite_io = 0;
|
||||
int write_sem = 0;
|
||||
struct dentry *dentry = file->f_path.dentry;
|
||||
struct inode *inode = d_inode(dentry);
|
||||
struct buffer_head *di_bh = NULL;
|
||||
u32 cpos;
|
||||
u32 clusters;
|
||||
|
||||
/*
|
||||
* We start with a read level meta lock and only jump to an ex
|
||||
* if we need to make modifications here.
|
||||
*/
|
||||
for(;;) {
|
||||
if (wait)
|
||||
ret = ocfs2_inode_lock(inode, NULL, meta_level);
|
||||
else
|
||||
ret = ocfs2_try_inode_lock(inode,
|
||||
overwrite_io ? NULL : &di_bh, meta_level);
|
||||
ret = ocfs2_inode_lock_for_extent_tree(inode,
|
||||
&di_bh,
|
||||
meta_level,
|
||||
overwrite_io,
|
||||
write_sem,
|
||||
wait);
|
||||
if (ret < 0) {
|
||||
meta_level = -1;
|
||||
if (ret != -EAGAIN)
|
||||
mlog_errno(ret);
|
||||
goto out;
|
||||
@ -2156,15 +2192,8 @@ static int ocfs2_prepare_inode_for_write(struct file *file,
|
||||
*/
|
||||
if (!wait && !overwrite_io) {
|
||||
overwrite_io = 1;
|
||||
if (!down_read_trylock(&OCFS2_I(inode)->ip_alloc_sem)) {
|
||||
ret = -EAGAIN;
|
||||
goto out_unlock;
|
||||
}
|
||||
|
||||
ret = ocfs2_overwrite_io(inode, di_bh, pos, count);
|
||||
brelse(di_bh);
|
||||
di_bh = NULL;
|
||||
up_read(&OCFS2_I(inode)->ip_alloc_sem);
|
||||
if (ret < 0) {
|
||||
if (ret != -EAGAIN)
|
||||
mlog_errno(ret);
|
||||
@ -2183,7 +2212,10 @@ static int ocfs2_prepare_inode_for_write(struct file *file,
|
||||
* set inode->i_size at the end of a write. */
|
||||
if (should_remove_suid(dentry)) {
|
||||
if (meta_level == 0) {
|
||||
ocfs2_inode_unlock(inode, meta_level);
|
||||
ocfs2_inode_unlock_for_extent_tree(inode,
|
||||
&di_bh,
|
||||
meta_level,
|
||||
write_sem);
|
||||
meta_level = 1;
|
||||
continue;
|
||||
}
|
||||
@ -2197,18 +2229,32 @@ static int ocfs2_prepare_inode_for_write(struct file *file,
|
||||
|
||||
ret = ocfs2_check_range_for_refcount(inode, pos, count);
|
||||
if (ret == 1) {
|
||||
ocfs2_inode_unlock(inode, meta_level);
|
||||
meta_level = -1;
|
||||
ocfs2_inode_unlock_for_extent_tree(inode,
|
||||
&di_bh,
|
||||
meta_level,
|
||||
write_sem);
|
||||
ret = ocfs2_inode_lock_for_extent_tree(inode,
|
||||
&di_bh,
|
||||
meta_level,
|
||||
overwrite_io,
|
||||
1,
|
||||
wait);
|
||||
write_sem = 1;
|
||||
if (ret < 0) {
|
||||
if (ret != -EAGAIN)
|
||||
mlog_errno(ret);
|
||||
goto out;
|
||||
}
|
||||
|
||||
ret = ocfs2_prepare_inode_for_refcount(inode,
|
||||
file,
|
||||
pos,
|
||||
count,
|
||||
&meta_level);
|
||||
cpos = pos >> OCFS2_SB(inode->i_sb)->s_clustersize_bits;
|
||||
clusters =
|
||||
ocfs2_clusters_for_bytes(inode->i_sb, pos + count) - cpos;
|
||||
ret = ocfs2_refcount_cow(inode, di_bh, cpos, clusters, UINT_MAX);
|
||||
}
|
||||
|
||||
if (ret < 0) {
|
||||
mlog_errno(ret);
|
||||
if (ret != -EAGAIN)
|
||||
mlog_errno(ret);
|
||||
goto out_unlock;
|
||||
}
|
||||
|
||||
@ -2219,10 +2265,10 @@ static int ocfs2_prepare_inode_for_write(struct file *file,
|
||||
trace_ocfs2_prepare_inode_for_write(OCFS2_I(inode)->ip_blkno,
|
||||
pos, count, wait);
|
||||
|
||||
brelse(di_bh);
|
||||
|
||||
if (meta_level >= 0)
|
||||
ocfs2_inode_unlock(inode, meta_level);
|
||||
ocfs2_inode_unlock_for_extent_tree(inode,
|
||||
&di_bh,
|
||||
meta_level,
|
||||
write_sem);
|
||||
|
||||
out:
|
||||
return ret;
|
||||
|
||||
Loading…
Reference in New Issue
Block a user