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Subject[PATCH 2/8] staging/lustre/llite: handle io init failure in ll_fault_io_init()
Date
From: John L. Hammond <john.hammond@intel.com>

In ll_fault_io_init(), if cl_io_init() has failed then cleanup and
return an ERR_PTR(). This fixes an oops in the page fault handling
code when a partially initialized io is used. In ll_page_mkwrite0() do
not call cl_io_fini() on an ERR_PTR().

Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-3487
Lustre-change: http://review.whamcloud.com/6735
Signed-off-by: John L. Hammond <john.hammond@intel.com>
Reviewed-by: Lai Siyao <lai.siyao@intel.com>
Reviewed-by: Jinshan Xiong <jinshan.xiong@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>
Signed-off-by: Peng Tao <tao.peng@emc.com>
Signed-off-by: Andreas Dilger <andreas.dilger@intel.com>
---
drivers/staging/lustre/lustre/llite/llite_mmap.c | 36 +++++++++++++---------
1 files changed, 21 insertions(+), 15 deletions(-)

diff --git a/drivers/staging/lustre/lustre/llite/llite_mmap.c b/drivers/staging/lustre/lustre/llite/llite_mmap.c
index d9590d8..8aa1dae 100644
--- a/drivers/staging/lustre/lustre/llite/llite_mmap.c
+++ b/drivers/staging/lustre/lustre/llite/llite_mmap.c
@@ -107,11 +107,12 @@ struct cl_io *ll_fault_io_init(struct vm_area_struct *vma,
struct cl_env_nest *nest,
pgoff_t index, unsigned long *ra_flags)
{
- struct file *file = vma->vm_file;
- struct inode *inode = file->f_dentry->d_inode;
- struct cl_io *io;
- struct cl_fault_io *fio;
- struct lu_env *env;
+ struct file *file = vma->vm_file;
+ struct inode *inode = file->f_dentry->d_inode;
+ struct cl_io *io;
+ struct cl_fault_io *fio;
+ struct lu_env *env;
+ int rc;
ENTRY;

*env_ret = NULL;
@@ -152,17 +153,22 @@ struct cl_io *ll_fault_io_init(struct vm_area_struct *vma,
CDEBUG(D_MMAP, "vm_flags: %lx (%lu %d)\n", vma->vm_flags,
fio->ft_index, fio->ft_executable);

- if (cl_io_init(env, io, CIT_FAULT, io->ci_obj) == 0) {
+ rc = cl_io_init(env, io, CIT_FAULT, io->ci_obj);
+ if (rc == 0) {
struct ccc_io *cio = ccc_env_io(env);
struct ll_file_data *fd = LUSTRE_FPRIVATE(file);

LASSERT(cio->cui_cl.cis_io == io);

- /* mmap lock must be MANDATORY
- * it has to cache pages. */
+ /* mmap lock must be MANDATORY it has to cache
+ * pages. */
io->ci_lockreq = CILR_MANDATORY;
-
- cio->cui_fd = fd;
+ cio->cui_fd = fd;
+ } else {
+ LASSERT(rc < 0);
+ cl_io_fini(env, io);
+ cl_env_nested_put(nest, env);
+ io = ERR_PTR(rc);
}

return io;
@@ -190,7 +196,7 @@ static int ll_page_mkwrite0(struct vm_area_struct *vma, struct page *vmpage,

result = io->ci_result;
if (result < 0)
- GOTO(out, result);
+ GOTO(out_io, result);

io->u.ci_fault.ft_mkwrite = 1;
io->u.ci_fault.ft_writable = 1;
@@ -252,14 +258,14 @@ static int ll_page_mkwrite0(struct vm_area_struct *vma, struct page *vmpage,
}
EXIT;

-out:
+out_io:
cl_io_fini(env, io);
cl_env_nested_put(&nest, env);
-
+out:
CDEBUG(D_MMAP, "%s mkwrite with %d\n", current->comm, result);
-
LASSERT(ergo(result == 0, PageLocked(vmpage)));
- return(result);
+
+ return result;
}


--
1.7.1


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