* [PATCH 1/2] cifs: move cifs_new_fileinfo call out of cifs_posix_open
2010-05-24 13:55 [PATCH 0/2] cifs: fix "Busy inodes after umount" issues (try #2) Jeff Layton
@ 2010-05-24 13:55 ` Jeff Layton
2010-05-24 13:55 ` [PATCH 2/2] cifs: pass instantiated filp back after open call Jeff Layton
1 sibling, 0 replies; 3+ messages in thread
From: Jeff Layton @ 2010-05-24 13:55 UTC (permalink / raw)
To: linux-cifs-client; +Cc: linux-fsdevel, sjayaraman
Having cifs_posix_open call cifs_new_fileinfo is problematic and
inconsistent with how "regular" opens work. It's also buggy as
cifs_reopen_file calls this function on a reconnect, which creates a new
struct cifsFileInfo that just gets leaked.
Push it out into the callers. This also allows us to get rid of the
"mnt" arg to cifs_posix_open.
Finally, in the event that a cifsFileInfo isn't or can't be created, we
always want to close the filehandle out on the server as the client
won't have a record of the filehandle and can't actually use it. Make
sure that CIFSSMBClose is called in those cases.
Signed-off-by: Jeff Layton <jlayton@redhat.com>
---
fs/cifs/cifsproto.h | 1 -
fs/cifs/dir.c | 43 ++++++++++++++++++-------------------------
fs/cifs/file.c | 17 ++++++++++++-----
3 files changed, 30 insertions(+), 31 deletions(-)
diff --git a/fs/cifs/cifsproto.h b/fs/cifs/cifsproto.h
index fb1657e..fb6318b 100644
--- a/fs/cifs/cifsproto.h
+++ b/fs/cifs/cifsproto.h
@@ -106,7 +106,6 @@ extern struct cifsFileInfo *cifs_new_fileinfo(struct inode *newinode,
__u16 fileHandle, struct file *file,
struct vfsmount *mnt, unsigned int oflags);
extern int cifs_posix_open(char *full_path, struct inode **pinode,
- struct vfsmount *mnt,
struct super_block *sb,
int mode, int oflags,
__u32 *poplock, __u16 *pnetfid, int xid);
diff --git a/fs/cifs/dir.c b/fs/cifs/dir.c
index 391816b..f49afb9 100644
--- a/fs/cifs/dir.c
+++ b/fs/cifs/dir.c
@@ -188,8 +188,7 @@ cifs_new_fileinfo(struct inode *newinode, __u16 fileHandle,
}
int cifs_posix_open(char *full_path, struct inode **pinode,
- struct vfsmount *mnt, struct super_block *sb,
- int mode, int oflags,
+ struct super_block *sb, int mode, int oflags,
__u32 *poplock, __u16 *pnetfid, int xid)
{
int rc;
@@ -258,19 +257,6 @@ int cifs_posix_open(char *full_path, struct inode **pinode,
cifs_fattr_to_inode(*pinode, &fattr);
}
- /*
- * cifs_fill_filedata() takes care of setting cifsFileInfo pointer to
- * file->private_data.
- */
- if (mnt) {
- struct cifsFileInfo *pfile_info;
-
- pfile_info = cifs_new_fileinfo(*pinode, *pnetfid, NULL, mnt,
- oflags);
- if (pfile_info == NULL)
- rc = -ENOMEM;
- }
-
posix_open_ret:
kfree(presp_data);
return rc;
@@ -298,7 +284,6 @@ cifs_create(struct inode *inode, struct dentry *direntry, int mode,
int create_options = CREATE_NOT_DIR;
__u32 oplock = 0;
int oflags;
- bool posix_create = false;
/*
* BB below access is probably too much for mknod to request
* but we have to do query and setpathinfo so requesting
@@ -339,7 +324,6 @@ cifs_create(struct inode *inode, struct dentry *direntry, int mode,
(CIFS_UNIX_POSIX_PATH_OPS_CAP &
le64_to_cpu(tcon->fsUnixInfo.Capability))) {
rc = cifs_posix_open(full_path, &newinode,
- nd ? nd->path.mnt : NULL,
inode->i_sb, mode, oflags, &oplock, &fileHandle, xid);
/* EIO could indicate that (posix open) operation is not
supported, despite what server claimed in capability
@@ -347,7 +331,6 @@ cifs_create(struct inode *inode, struct dentry *direntry, int mode,
handled in posix open */
if (rc == 0) {
- posix_create = true;
if (newinode == NULL) /* query inode info */
goto cifs_create_get_file_info;
else /* success, no need to query */
@@ -478,11 +461,7 @@ cifs_create_set_dentry:
else
cFYI(1, "Create worked, get_inode_info failed rc = %d", rc);
- /* nfsd case - nfs srv does not set nd */
- if ((nd == NULL) || (!(nd->flags & LOOKUP_OPEN))) {
- /* mknod case - do not leave file open */
- CIFSSMBClose(xid, tcon, fileHandle);
- } else if (!(posix_create) && (newinode)) {
+ if (newinode && nd && (nd->flags & LOOKUP_OPEN)) {
struct cifsFileInfo *pfile_info;
/*
* cifs_fill_filedata() takes care of setting cifsFileInfo
@@ -492,7 +471,10 @@ cifs_create_set_dentry:
nd->path.mnt, oflags);
if (pfile_info == NULL)
rc = -ENOMEM;
+ } else {
+ CIFSSMBClose(xid, tcon, fileHandle);
}
+
cifs_create_out:
kfree(buf);
kfree(full_path);
@@ -636,6 +618,7 @@ cifs_lookup(struct inode *parent_dir_inode, struct dentry *direntry,
bool posix_open = false;
struct cifs_sb_info *cifs_sb;
struct cifsTconInfo *pTcon;
+ struct cifsFileInfo *cfile;
struct inode *newInode = NULL;
char *full_path = NULL;
struct file *filp;
@@ -703,7 +686,7 @@ cifs_lookup(struct inode *parent_dir_inode, struct dentry *direntry,
if (nd && !(nd->flags & (LOOKUP_PARENT | LOOKUP_DIRECTORY)) &&
(nd->flags & LOOKUP_OPEN) && !pTcon->broken_posix_open &&
(nd->intent.open.flags & O_CREAT)) {
- rc = cifs_posix_open(full_path, &newInode, nd->path.mnt,
+ rc = cifs_posix_open(full_path, &newInode,
parent_dir_inode->i_sb,
nd->intent.open.create_mode,
nd->intent.open.flags, &oplock,
@@ -733,8 +716,17 @@ cifs_lookup(struct inode *parent_dir_inode, struct dentry *direntry,
else
direntry->d_op = &cifs_dentry_ops;
d_add(direntry, newInode);
- if (posix_open)
+ if (posix_open) {
+ cfile = cifs_new_fileinfo(newInode, fileHandle, NULL,
+ nd->path.mnt,
+ nd->intent.open.flags);
+ if (cfile == NULL) {
+ CIFSSMBClose(xid, pTcon, fileHandle);
+ rc = -ENOMEM;
+ goto lookup_out;
+ }
filp = lookup_instantiate_filp(nd, direntry, NULL);
+ }
/* since paths are not looked up by component - the parent
directories are presumed to be good here */
renew_parental_timestamps(direntry);
@@ -755,6 +747,7 @@ cifs_lookup(struct inode *parent_dir_inode, struct dentry *direntry,
is a common return code */
}
+lookup_out:
kfree(full_path);
FreeXid(xid);
return ERR_PTR(rc);
diff --git a/fs/cifs/file.c b/fs/cifs/file.c
index a83541e..001e916 100644
--- a/fs/cifs/file.c
+++ b/fs/cifs/file.c
@@ -299,8 +299,7 @@ int cifs_open(struct inode *inode, struct file *file)
int oflags = (int) cifs_posix_convert_flags(file->f_flags);
oflags |= SMB_O_CREAT;
/* can not refresh inode info since size could be stale */
- rc = cifs_posix_open(full_path, &inode, file->f_path.mnt,
- inode->i_sb,
+ rc = cifs_posix_open(full_path, &inode, inode->i_sb,
cifs_sb->mnt_file_mode /* ignored */,
oflags, &oplock, &netfid, xid);
if (rc == 0) {
@@ -308,7 +307,16 @@ int cifs_open(struct inode *inode, struct file *file)
/* no need for special case handling of setting mode
on read only files needed here */
- pCifsFile = cifs_fill_filedata(file);
+ pCifsFile = cifs_new_fileinfo(inode, netfid, file,
+ file->f_path.mnt,
+ oflags);
+ if (pCifsFile == NULL) {
+ CIFSSMBClose(xid, tcon, netfid);
+ rc = -ENOMEM;
+ goto out;
+ }
+ file->private_data = pCifsFile;
+
cifs_posix_open_inode_helper(inode, file, pCifsInode,
oplock, netfid);
goto out;
@@ -513,8 +521,7 @@ reopen_error_exit:
le64_to_cpu(tcon->fsUnixInfo.Capability))) {
int oflags = (int) cifs_posix_convert_flags(file->f_flags);
/* can not refresh inode info since size could be stale */
- rc = cifs_posix_open(full_path, NULL, file->f_path.mnt,
- inode->i_sb,
+ rc = cifs_posix_open(full_path, NULL, inode->i_sb,
cifs_sb->mnt_file_mode /* ignored */,
oflags, &oplock, &netfid, xid);
if (rc == 0) {
--
1.6.6.1
^ permalink raw reply related [flat|nested] 3+ messages in thread* [PATCH 2/2] cifs: pass instantiated filp back after open call
2010-05-24 13:55 [PATCH 0/2] cifs: fix "Busy inodes after umount" issues (try #2) Jeff Layton
2010-05-24 13:55 ` [PATCH 1/2] cifs: move cifs_new_fileinfo call out of cifs_posix_open Jeff Layton
@ 2010-05-24 13:55 ` Jeff Layton
1 sibling, 0 replies; 3+ messages in thread
From: Jeff Layton @ 2010-05-24 13:55 UTC (permalink / raw)
To: linux-cifs-client; +Cc: linux-fsdevel, sjayaraman
The current scheme of sticking open files on a list and assuming that
cifs_open will scoop them off of it is broken and leads to "Busy
inodes after umount..." errors at unmount time.
The problem is that there is no guarantee that cifs_open will always
be called after a ->lookup or ->create operation. If there are
permissions or other problems, then it's quite likely that it *won't*
be called.
Fix this by fully instantiating the filp whenever the file is created
and pass that filp back to the VFS. If there is a problem, the VFS
can clean up the references.
Signed-off-by: Jeff Layton <jlayton@redhat.com>
---
fs/cifs/dir.c | 35 +++++++++++++++++++++++++++--------
fs/cifs/file.c | 44 ++------------------------------------------
2 files changed, 29 insertions(+), 50 deletions(-)
diff --git a/fs/cifs/dir.c b/fs/cifs/dir.c
index f49afb9..e7ae78b 100644
--- a/fs/cifs/dir.c
+++ b/fs/cifs/dir.c
@@ -25,6 +25,7 @@
#include <linux/slab.h>
#include <linux/namei.h>
#include <linux/mount.h>
+#include <linux/file.h>
#include "cifsfs.h"
#include "cifspdu.h"
#include "cifsglob.h"
@@ -184,6 +185,8 @@ cifs_new_fileinfo(struct inode *newinode, __u16 fileHandle,
}
write_unlock(&GlobalSMBSeslock);
+ file->private_data = pCifsFile;
+
return pCifsFile;
}
@@ -463,14 +466,22 @@ cifs_create_set_dentry:
if (newinode && nd && (nd->flags & LOOKUP_OPEN)) {
struct cifsFileInfo *pfile_info;
- /*
- * cifs_fill_filedata() takes care of setting cifsFileInfo
- * pointer to file->private_data.
- */
- pfile_info = cifs_new_fileinfo(newinode, fileHandle, NULL,
+ struct file *filp;
+
+ filp = lookup_instantiate_filp(nd, direntry, generic_file_open);
+ if (IS_ERR(filp)) {
+ rc = PTR_ERR(filp);
+ CIFSSMBClose(xid, tcon, fileHandle);
+ goto cifs_create_out;
+ }
+
+ pfile_info = cifs_new_fileinfo(newinode, fileHandle, filp,
nd->path.mnt, oflags);
- if (pfile_info == NULL)
+ if (pfile_info == NULL) {
+ fput(filp);
+ CIFSSMBClose(xid, tcon, fileHandle);
rc = -ENOMEM;
+ }
} else {
CIFSSMBClose(xid, tcon, fileHandle);
}
@@ -717,15 +728,23 @@ cifs_lookup(struct inode *parent_dir_inode, struct dentry *direntry,
direntry->d_op = &cifs_dentry_ops;
d_add(direntry, newInode);
if (posix_open) {
- cfile = cifs_new_fileinfo(newInode, fileHandle, NULL,
+ filp = lookup_instantiate_filp(nd, direntry,
+ generic_file_open);
+ if (IS_ERR(filp)) {
+ rc = PTR_ERR(filp);
+ CIFSSMBClose(xid, pTcon, fileHandle);
+ goto lookup_out;
+ }
+
+ cfile = cifs_new_fileinfo(newInode, fileHandle, filp,
nd->path.mnt,
nd->intent.open.flags);
if (cfile == NULL) {
+ fput(filp);
CIFSSMBClose(xid, pTcon, fileHandle);
rc = -ENOMEM;
goto lookup_out;
}
- filp = lookup_instantiate_filp(nd, direntry, NULL);
}
/* since paths are not looked up by component - the parent
directories are presumed to be good here */
diff --git a/fs/cifs/file.c b/fs/cifs/file.c
index 001e916..310533d 100644
--- a/fs/cifs/file.c
+++ b/fs/cifs/file.c
@@ -162,38 +162,6 @@ psx_client_can_cache:
return 0;
}
-static struct cifsFileInfo *
-cifs_fill_filedata(struct file *file)
-{
- struct list_head *tmp;
- struct cifsFileInfo *pCifsFile = NULL;
- struct cifsInodeInfo *pCifsInode = NULL;
-
- /* search inode for this file and fill in file->private_data */
- pCifsInode = CIFS_I(file->f_path.dentry->d_inode);
- read_lock(&GlobalSMBSeslock);
- list_for_each(tmp, &pCifsInode->openFileList) {
- pCifsFile = list_entry(tmp, struct cifsFileInfo, flist);
- if ((pCifsFile->pfile == NULL) &&
- (pCifsFile->pid == current->tgid)) {
- /* mode set in cifs_create */
-
- /* needed for writepage */
- pCifsFile->pfile = file;
- file->private_data = pCifsFile;
- break;
- }
- }
- read_unlock(&GlobalSMBSeslock);
-
- if (file->private_data != NULL) {
- return pCifsFile;
- } else if ((file->f_flags & O_CREAT) && (file->f_flags & O_EXCL))
- cERROR(1, "could not find file instance for "
- "new file %p", file);
- return NULL;
-}
-
/* all arguments to this function must be checked for validity in caller */
static inline int cifs_open_inode_helper(struct inode *inode, struct file *file,
struct cifsInodeInfo *pCifsInode, struct cifsFileInfo *pCifsFile,
@@ -256,7 +224,7 @@ int cifs_open(struct inode *inode, struct file *file)
__u32 oplock;
struct cifs_sb_info *cifs_sb;
struct cifsTconInfo *tcon;
- struct cifsFileInfo *pCifsFile;
+ struct cifsFileInfo *pCifsFile = NULL;
struct cifsInodeInfo *pCifsInode;
char *full_path = NULL;
int desiredAccess;
@@ -270,12 +238,6 @@ int cifs_open(struct inode *inode, struct file *file)
tcon = cifs_sb->tcon;
pCifsInode = CIFS_I(file->f_path.dentry->d_inode);
- pCifsFile = cifs_fill_filedata(file);
- if (pCifsFile) {
- rc = 0;
- FreeXid(xid);
- return rc;
- }
full_path = build_path_from_dentry(file->f_path.dentry);
if (full_path == NULL) {
@@ -315,7 +277,6 @@ int cifs_open(struct inode *inode, struct file *file)
rc = -ENOMEM;
goto out;
}
- file->private_data = pCifsFile;
cifs_posix_open_inode_helper(inode, file, pCifsInode,
oplock, netfid);
@@ -401,8 +362,7 @@ int cifs_open(struct inode *inode, struct file *file)
pCifsFile = cifs_new_fileinfo(inode, netfid, file, file->f_path.mnt,
file->f_flags);
- file->private_data = pCifsFile;
- if (file->private_data == NULL) {
+ if (pCifsFile == NULL) {
rc = -ENOMEM;
goto out;
}
--
1.6.6.1
^ permalink raw reply related [flat|nested] 3+ messages in thread