[CIFS] [CIFS] Do not take rename sem on most path based calls (during

building of full path) to avoid hang rename/readdir hang

Reported by Alan Tyson

Signed-off-by: Steve French <sfrench@us.ibm.com>

7 files changed, 0 insertions, 30 deletions

diff --git a/fs/cifs/dir.c b/fs/cifs/dir.c
index 1d0ca3eaaca5..3830dfeb31cf 100644
--- a/fs/cifs/dir.c
+++ b/fs/cifs/dir.c
@@ -139,9 +139,7 @@ cifs_create(struct inode *inode, struct dentry *direntry, int mode,
         cifs_sb = CIFS_SB(inode->i_sb);
         pTcon = cifs_sb->tcon;
 
-        mutex_lock(&direntry->d_sb->s_vfs_rename_mutex);
         full_path = build_path_from_dentry(direntry);
-        mutex_unlock(&direntry->d_sb->s_vfs_rename_mutex);
         if(full_path == NULL) {
                 FreeXid(xid);
                 return -ENOMEM;
@@ -316,9 +314,7 @@ int cifs_mknod(struct inode *inode, struct dentry *direntry, int mode,
         cifs_sb = CIFS_SB(inode->i_sb);
         pTcon = cifs_sb->tcon;
 
-        mutex_lock(&direntry->d_sb->s_vfs_rename_mutex);
         full_path = build_path_from_dentry(direntry);
-        mutex_unlock(&direntry->d_sb->s_vfs_rename_mutex);
         if(full_path == NULL)
                 rc = -ENOMEM;
         else if (pTcon->ses->capabilities & CAP_UNIX) {
diff --git a/fs/cifs/fcntl.c b/fs/cifs/fcntl.c
index ec4dfe9bf5ef..633a93811328 100644
--- a/fs/cifs/fcntl.c
+++ b/fs/cifs/fcntl.c
@@ -86,9 +86,7 @@ int cifs_dir_notify(struct file * file, unsigned long arg)
         cifs_sb = CIFS_SB(file->f_dentry->d_sb);
         pTcon = cifs_sb->tcon;
 
-        mutex_lock(&file->f_dentry->d_sb->s_vfs_rename_mutex);
         full_path = build_path_from_dentry(file->f_dentry);
-        mutex_unlock(&file->f_dentry->d_sb->s_vfs_rename_mutex);
 
         if(full_path == NULL) {
                 rc = -ENOMEM;
diff --git a/fs/cifs/file.c b/fs/cifs/file.c
index 5c497c529772..1476725e6051 100644
--- a/fs/cifs/file.c
+++ b/fs/cifs/file.c
@@ -203,9 +203,7 @@ int cifs_open(struct inode *inode, struct file *file)
                 }
         }
 
-        mutex_lock(&inode->i_sb->s_vfs_rename_mutex);
         full_path = build_path_from_dentry(file->f_dentry);
-        mutex_unlock(&inode->i_sb->s_vfs_rename_mutex);
         if (full_path == NULL) {
                 FreeXid(xid);
                 return -ENOMEM;
diff --git a/fs/cifs/inode.c b/fs/cifs/inode.c
index 957ddd1571c6..4093764ef461 100644
--- a/fs/cifs/inode.c
+++ b/fs/cifs/inode.c
@@ -722,9 +722,7 @@ int cifs_mkdir(struct inode *inode, struct dentry *direntry, int mode)
         cifs_sb = CIFS_SB(inode->i_sb);
         pTcon = cifs_sb->tcon;
 
-        mutex_lock(&inode->i_sb->s_vfs_rename_mutex);
         full_path = build_path_from_dentry(direntry);
-        mutex_unlock(&inode->i_sb->s_vfs_rename_mutex);
         if (full_path == NULL) {
                 FreeXid(xid);
                 return -ENOMEM;
@@ -807,9 +805,7 @@ int cifs_rmdir(struct inode *inode, struct dentry *direntry)
         cifs_sb = CIFS_SB(inode->i_sb);
         pTcon = cifs_sb->tcon;
 
-        mutex_lock(&inode->i_sb->s_vfs_rename_mutex);
         full_path = build_path_from_dentry(direntry);
-        mutex_unlock(&inode->i_sb->s_vfs_rename_mutex);
         if (full_path == NULL) {
                 FreeXid(xid);
                 return -ENOMEM;
@@ -1141,9 +1137,7 @@ int cifs_setattr(struct dentry *direntry, struct iattr *attrs)
                         rc = 0;
         }
                 
-        mutex_lock(&direntry->d_sb->s_vfs_rename_mutex);
         full_path = build_path_from_dentry(direntry);
-        mutex_unlock(&direntry->d_sb->s_vfs_rename_mutex);
         if (full_path == NULL) {
                 FreeXid(xid);
                 return -ENOMEM;
diff --git a/fs/cifs/link.c b/fs/cifs/link.c
index 9562f5bba65c..2ec99f833142 100644
--- a/fs/cifs/link.c
+++ b/fs/cifs/link.c
@@ -48,10 +48,8 @@ cifs_hardlink(struct dentry *old_file, struct inode *inode,
 /* No need to check for cross device links since server will do that
    BB note DFS case in future though (when we may have to check) */
 
-        mutex_lock(&inode->i_sb->s_vfs_rename_mutex);
         fromName = build_path_from_dentry(old_file);
         toName = build_path_from_dentry(direntry);
-        mutex_unlock(&inode->i_sb->s_vfs_rename_mutex);
         if((fromName == NULL) || (toName == NULL)) {
                 rc = -ENOMEM;
                 goto cifs_hl_exit;
@@ -103,9 +101,7 @@ cifs_follow_link(struct dentry *direntry, struct nameidata *nd)
 
         xid = GetXid();
 
-        mutex_lock(&direntry->d_sb->s_vfs_rename_mutex);
         full_path = build_path_from_dentry(direntry);
-        mutex_unlock(&direntry->d_sb->s_vfs_rename_mutex);
 
         if (!full_path)
                 goto out_no_free;
@@ -164,9 +160,7 @@ cifs_symlink(struct inode *inode, struct dentry *direntry, const char *symname)
         cifs_sb = CIFS_SB(inode->i_sb);
         pTcon = cifs_sb->tcon;
 
-        mutex_lock(&inode->i_sb->s_vfs_rename_mutex);
         full_path = build_path_from_dentry(direntry);
-        mutex_unlock(&inode->i_sb->s_vfs_rename_mutex);
 
         if(full_path == NULL) {
                 FreeXid(xid);
diff --git a/fs/cifs/readdir.c b/fs/cifs/readdir.c
index 2f6e2825571e..7b8591acc5ad 100644
--- a/fs/cifs/readdir.c
+++ b/fs/cifs/readdir.c
@@ -404,9 +404,7 @@ static int initiate_cifs_search(const int xid, struct file *file)
         if(pTcon == NULL)
                 return -EINVAL;
 
-        mutex_lock(&file->f_dentry->d_sb->s_vfs_rename_mutex);
         full_path = build_path_from_dentry(file->f_dentry);
-        mutex_unlock(&file->f_dentry->d_sb->s_vfs_rename_mutex);
 
         if(full_path == NULL) {
                 return -ENOMEM;
diff --git a/fs/cifs/xattr.c b/fs/cifs/xattr.c
index 3938444d87b2..7754d641775e 100644
--- a/fs/cifs/xattr.c
+++ b/fs/cifs/xattr.c
@@ -62,9 +62,7 @@ int cifs_removexattr(struct dentry * direntry, const char * ea_name)
         cifs_sb = CIFS_SB(sb);
         pTcon = cifs_sb->tcon;
                                                                                      
-        mutex_lock(&sb->s_vfs_rename_mutex);
         full_path = build_path_from_dentry(direntry);
-        mutex_unlock(&sb->s_vfs_rename_mutex);
         if(full_path == NULL) {
                 FreeXid(xid);
                 return -ENOMEM;
@@ -116,9 +114,7 @@ int cifs_setxattr(struct dentry * direntry, const char * ea_name,
         cifs_sb = CIFS_SB(sb);
         pTcon = cifs_sb->tcon;
 
-        mutex_lock(&sb->s_vfs_rename_mutex);
         full_path = build_path_from_dentry(direntry);
-        mutex_unlock(&sb->s_vfs_rename_mutex);
         if(full_path == NULL) {
                 FreeXid(xid);
                 return -ENOMEM;
@@ -223,9 +219,7 @@ ssize_t cifs_getxattr(struct dentry * direntry, const char * ea_name,
         cifs_sb = CIFS_SB(sb);
         pTcon = cifs_sb->tcon;
 
-        mutex_lock(&sb->s_vfs_rename_mutex);
         full_path = build_path_from_dentry(direntry);
-        mutex_unlock(&sb->s_vfs_rename_mutex);
         if(full_path == NULL) {
                 FreeXid(xid);
                 return -ENOMEM;
@@ -341,9 +335,7 @@ ssize_t cifs_listxattr(struct dentry * direntry, char * data, size_t buf_size)
         cifs_sb = CIFS_SB(sb);
         pTcon = cifs_sb->tcon;
 
-        mutex_lock(&sb->s_vfs_rename_mutex);
         full_path = build_path_from_dentry(direntry);
-        mutex_unlock(&sb->s_vfs_rename_mutex);
         if(full_path == NULL) {
                 FreeXid(xid);
                 return -ENOMEM;