Messages in this thread Patch in this message | | | Date | Sun, 02 Jul 2006 20:53:39 -0400 | From | "Theodore Ts'o" <> | Subject | [patch 6/8] inode-diet: Move i_cindex from struct inode to struct file |
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inode.i_cindex isn't initialized until the character device is opened anyway, and there are far more struct inodes in memory than there are struct file. So move the cindex field to file.f_cindex, and change the one(!) user of cindex to use file pointer, which is in fact simpler.
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Index: linux-2.6.17-mm5/include/linux/fs.h =================================================================== --- linux-2.6.17-mm5.orig/include/linux/fs.h 2006-07-02 20:29:16.000000000 -0400 +++ linux-2.6.17-mm5/include/linux/fs.h 2006-07-02 20:29:49.000000000 -0400 @@ -528,7 +528,6 @@ struct block_device *i_bdev; struct cdev *i_cdev; }; - int i_cindex; __u32 i_generation; @@ -749,6 +748,7 @@ spinlock_t f_ep_lock; #endif /* #ifdef CONFIG_EPOLL */ struct address_space *f_mapping; + int f_cindex; }; extern spinlock_t files_lock; #define file_list_lock() spin_lock(&files_lock); Index: linux-2.6.17-mm5/fs/char_dev.c =================================================================== --- linux-2.6.17-mm5.orig/fs/char_dev.c 2006-07-02 20:25:46.000000000 -0400 +++ linux-2.6.17-mm5/fs/char_dev.c 2006-07-02 20:29:49.000000000 -0400 @@ -288,7 +288,7 @@ p = inode->i_cdev; if (!p) { inode->i_cdev = p = new; - inode->i_cindex = idx; + filp->f_cindex = idx; list_add(&inode->i_devices, &p->list); new = NULL; } else if (!cdev_get(p)) Index: linux-2.6.17-mm5/drivers/ieee1394/ieee1394_core.h =================================================================== --- linux-2.6.17-mm5.orig/drivers/ieee1394/ieee1394_core.h 2006-07-02 20:25:31.000000000 -0400 +++ linux-2.6.17-mm5/drivers/ieee1394/ieee1394_core.h 2006-07-02 20:29:49.000000000 -0400 @@ -212,7 +212,7 @@ /* return the index (within a minor number block) of a file */ static inline unsigned char ieee1394_file_to_instance(struct file *file) { - return file->f_dentry->d_inode->i_cindex; + return file->f_cindex; } extern int hpsb_disable_irm; -- - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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