Commit 8e82373a authored by Andrew Morton's avatar Andrew Morton Committed by Dave Jones

[PATCH] file_list: less locking

- optimise file_kill() to not take the global lock if the file is not on a
  list.

- Use optimised file_kill() in a few places rather than open-coding the
  list removal.
parent 4cac8a28
...@@ -169,11 +169,9 @@ void __fput(struct file *file) ...@@ -169,11 +169,9 @@ void __fput(struct file *file)
fops_put(file->f_op); fops_put(file->f_op);
if (file->f_mode & FMODE_WRITE) if (file->f_mode & FMODE_WRITE)
put_write_access(inode); put_write_access(inode);
file_list_lock();
file->f_dentry = NULL; file->f_dentry = NULL;
file->f_vfsmnt = NULL; file->f_vfsmnt = NULL;
list_del(&file->f_list); file_kill(file);
file_list_unlock();
file_free(file); file_free(file);
dput(dentry); dput(dentry);
mntput(mnt); mntput(mnt);
...@@ -196,9 +194,7 @@ void put_filp(struct file *file) ...@@ -196,9 +194,7 @@ void put_filp(struct file *file)
{ {
if (atomic_dec_and_test(&file->f_count)) { if (atomic_dec_and_test(&file->f_count)) {
security_file_free(file); security_file_free(file);
file_list_lock(); file_kill(file);
list_del(&file->f_list);
file_list_unlock();
file_free(file); file_free(file);
} }
} }
...@@ -214,9 +210,11 @@ void file_move(struct file *file, struct list_head *list) ...@@ -214,9 +210,11 @@ void file_move(struct file *file, struct list_head *list)
void file_kill(struct file *file) void file_kill(struct file *file)
{ {
if (!list_empty(&file->f_list)) {
file_list_lock(); file_list_lock();
list_del_init(&file->f_list); list_del_init(&file->f_list);
file_list_unlock(); file_list_unlock();
}
} }
int fs_may_remount_ro(struct super_block *sb) int fs_may_remount_ro(struct super_block *sb)
......
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