forked from luck/tmp_suning_uos_patched
9fd5746fd3
The only user of the i_cindex element in the inode structure is used is by the firewire drivers. As part of an attempt to slim down the inode structure to save memory --- since a typical Linux system will have hundreds of thousands if not millions of inodes cached, a reduction in the size inode has high leverage. The firewire driver does not need i_cindex in any fast path, so it's simple enough to calculate when it is needed, instead of wasting space in the inode structure. Signed-off-by: "Theodore Ts'o" <tytso@mit.edu> Cc: krh@redhat.com Cc: stefanr@s5r6.in-berlin.de Cc: linux-fsdevel@vger.kernel.org Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
38 lines
677 B
C
38 lines
677 B
C
#ifndef _LINUX_CDEV_H
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#define _LINUX_CDEV_H
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#include <linux/kobject.h>
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#include <linux/kdev_t.h>
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#include <linux/list.h>
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struct file_operations;
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struct inode;
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struct module;
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struct cdev {
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struct kobject kobj;
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struct module *owner;
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const struct file_operations *ops;
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struct list_head list;
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dev_t dev;
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unsigned int count;
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};
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void cdev_init(struct cdev *, const struct file_operations *);
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struct cdev *cdev_alloc(void);
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void cdev_put(struct cdev *p);
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int cdev_add(struct cdev *, dev_t, unsigned);
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void cdev_del(struct cdev *);
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int cdev_index(struct inode *inode);
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void cd_forget(struct inode *);
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extern struct backing_dev_info directly_mappable_cdev_bdi;
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#endif
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