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authorJeff Layton <jlayton@redhat.com>2012-09-19 06:22:45 -0700
committerSteve French <smfrench@gmail.com>2012-09-24 21:46:34 -0500
commit101b92d9590a645d6fb643654b3a92556203b745 (patch)
treefb5e6ce303a74fae0bcca5904e39d0ca9d403c5b
parent233839b1df65a24c8b67b748fe7b18d86d0ad6d7 (diff)
downloadlinux-101b92d9590a645d6fb643654b3a92556203b745.tar.bz2
cifs: cleanups for cifs_mkdir_qinfo
Rename inode pointers for better clarity. Move the d_instantiate call to the end of the function to prevent other tasks from seeing it before we've finished constructing it. Since we should have exclusive access to the inode at this point, remove the spinlock around i_nlink update. Reviewed-by: Pavel Shilovsky <piastry@etersoft.ru> Signed-off-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Steve French <sfrench@us.ibm.com>
-rw-r--r--fs/cifs/inode.c51
1 files changed, 24 insertions, 27 deletions
diff --git a/fs/cifs/inode.c b/fs/cifs/inode.c
index e74e1bceb416..3d155875f446 100644
--- a/fs/cifs/inode.c
+++ b/fs/cifs/inode.c
@@ -1177,34 +1177,33 @@ unlink_out:
}
static int
-cifs_mkdir_qinfo(struct inode *inode, struct dentry *dentry, umode_t mode,
+cifs_mkdir_qinfo(struct inode *parent, struct dentry *dentry, umode_t mode,
const char *full_path, struct cifs_sb_info *cifs_sb,
struct cifs_tcon *tcon, const unsigned int xid)
{
int rc = 0;
- struct inode *newinode = NULL;
+ struct inode *inode = NULL;
if (tcon->unix_ext)
- rc = cifs_get_inode_info_unix(&newinode, full_path, inode->i_sb,
+ rc = cifs_get_inode_info_unix(&inode, full_path, parent->i_sb,
xid);
else
- rc = cifs_get_inode_info(&newinode, full_path, NULL,
- inode->i_sb, xid, NULL);
+ rc = cifs_get_inode_info(&inode, full_path, NULL, parent->i_sb,
+ xid, NULL);
+
if (rc)
return rc;
- d_instantiate(dentry, newinode);
/*
* setting nlink not necessary except in cases where we failed to get it
- * from the server or was set bogus
+ * from the server or was set bogus. Also, since this is a brand new
+ * inode, no need to grab the i_lock before setting the i_nlink.
*/
- spin_lock(&dentry->d_inode->i_lock);
- if ((dentry->d_inode) && (dentry->d_inode->i_nlink < 2))
- set_nlink(dentry->d_inode, 2);
- spin_unlock(&dentry->d_inode->i_lock);
+ if (inode->i_nlink < 2)
+ set_nlink(inode, 2);
mode &= ~current_umask();
/* must turn on setgid bit if parent dir has it */
- if (inode->i_mode & S_ISGID)
+ if (parent->i_mode & S_ISGID)
mode |= S_ISGID;
if (tcon->unix_ext) {
@@ -1217,8 +1216,8 @@ cifs_mkdir_qinfo(struct inode *inode, struct dentry *dentry, umode_t mode,
};
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
args.uid = (__u64)current_fsuid();
- if (inode->i_mode & S_ISGID)
- args.gid = (__u64)inode->i_gid;
+ if (parent->i_mode & S_ISGID)
+ args.gid = (__u64)parent->i_gid;
else
args.gid = (__u64)current_fsgid();
} else {
@@ -1233,22 +1232,20 @@ cifs_mkdir_qinfo(struct inode *inode, struct dentry *dentry, umode_t mode,
struct TCP_Server_Info *server = tcon->ses->server;
if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) &&
(mode & S_IWUGO) == 0 && server->ops->mkdir_setinfo)
- server->ops->mkdir_setinfo(newinode, full_path, cifs_sb,
+ server->ops->mkdir_setinfo(inode, full_path, cifs_sb,
tcon, xid);
- if (dentry->d_inode) {
- if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
- dentry->d_inode->i_mode = (mode | S_IFDIR);
-
- if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
- dentry->d_inode->i_uid = current_fsuid();
- if (inode->i_mode & S_ISGID)
- dentry->d_inode->i_gid = inode->i_gid;
- else
- dentry->d_inode->i_gid =
- current_fsgid();
- }
+ if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
+ inode->i_mode = (mode | S_IFDIR);
+
+ if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
+ inode->i_uid = current_fsuid();
+ if (inode->i_mode & S_ISGID)
+ inode->i_gid = parent->i_gid;
+ else
+ inode->i_gid = current_fsgid();
}
}
+ d_instantiate(dentry, inode);
return rc;
}