From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from mail-wm0-x243.google.com ([2a00:1450:400c:c09::243]) by bombadil.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1aP9hj-0008B7-Ot for barebox@lists.infradead.org; Fri, 29 Jan 2016 14:07:17 +0000 Received: by mail-wm0-x243.google.com with SMTP id p63so10071729wmp.1 for ; Fri, 29 Jan 2016 06:06:55 -0800 (PST) From: yegorslists@googlemail.com Date: Fri, 29 Jan 2016 15:06:21 +0100 Message-Id: <1454076381-17375-2-git-send-email-yegorslists@googlemail.com> In-Reply-To: <1454076381-17375-1-git-send-email-yegorslists@googlemail.com> References: <1454076381-17375-1-git-send-email-yegorslists@googlemail.com> List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "barebox" Errors-To: barebox-bounces+u.kleine-koenig=pengutronix.de@lists.infradead.org Subject: [PATCH 2/2] fs: add super_operations infrastructure To: barebox@lists.infradead.org From: Yegor Yefremov Signed-off-by: Yegor Yefremov --- fs/Makefile | 1 + fs/inode.c | 34 ++++++++++++++++++++++++++++++++++ fs/ubifs/super.c | 26 +++++++++++--------------- include/linux/fs.h | 6 ++++++ 4 files changed, 52 insertions(+), 15 deletions(-) create mode 100644 fs/inode.c diff --git a/fs/Makefile b/fs/Makefile index 7896e38..320e6fa 100644 --- a/fs/Makefile +++ b/fs/Makefile @@ -5,6 +5,7 @@ obj-y += devfs-core.o obj-$(CONFIG_FS_DEVFS) += devfs.o obj-$(CONFIG_FS_FAT) += fat/ obj-y += fs.o +obj-y += inode.o obj-$(CONFIG_FS_UBIFS) += ubifs/ obj-$(CONFIG_FS_TFTP) += tftp.o obj-$(CONFIG_FS_OMAP4_USBBOOT) += omap4_usbbootfs.o diff --git a/fs/inode.c b/fs/inode.c new file mode 100644 index 0000000..f9b1b63 --- /dev/null +++ b/fs/inode.c @@ -0,0 +1,34 @@ +/* + * (C) 1997 Linus Torvalds + * (C) 1999 Andrea Arcangeli (dynamic inode allocation) + */ + +#include + +/** + * iget_locked - obtain an inode from a mounted file system + * @sb: super block of file system + * @ino: inode number to get + * + * Search for the inode specified by @ino in the inode cache and if present + * return it with an increased reference count. This is for file systems + * where the inode number is sufficient for unique identification of an inode. + * + * If the inode is not in cache, allocate a new inode and return it locked, + * hashed, and with the I_NEW flag set. The file system gets to fill it in + * before unlocking it via unlock_new_inode(). + */ +struct inode *iget_locked(struct super_block *sb, unsigned long ino) +{ + struct inode *inode; + + inode = sb->s_op->alloc_inode(sb); + if (inode) { + inode->i_ino = ino; + inode->i_sb = sb; + list_add(&inode->i_sb_list, &sb->s_inodes); + inode->i_state = I_SYNC | I_NEW; + } + + return inode; +} diff --git a/fs/ubifs/super.c b/fs/ubifs/super.c index b45240d..10f922a 100644 --- a/fs/ubifs/super.c +++ b/fs/ubifs/super.c @@ -79,21 +79,6 @@ static int validate_inode(struct ubifs_info *c, const struct inode *inode) return err; } -struct inode *iget_locked(struct super_block *sb, unsigned long ino) -{ - struct inode *inode; - - inode = (struct inode *)malloc(sizeof(struct ubifs_inode)); - if (inode) { - inode->i_ino = ino; - inode->i_sb = sb; - list_add(&inode->i_sb_list, &sb->s_inodes); - inode->i_state = I_SYNC | I_NEW; - } - - return inode; -} - int ubifs_iput(struct inode *inode) { list_del_init(&inode->i_sb_list); @@ -814,6 +799,15 @@ void ubifs_umount(struct ubifs_info *c) ubifs_debugging_exit(c); } +static struct inode *ubifs_alloc_inode(struct super_block *sb) +{ + return (struct inode *)malloc(sizeof(struct ubifs_inode)); +}; + +const struct super_operations ubifs_super_operations = { + .alloc_inode = ubifs_alloc_inode, +}; + struct super_block *ubifs_get_super(struct device_d *dev, struct ubi_volume_desc *ubi, int silent) { struct super_block *sb; @@ -888,6 +882,8 @@ struct super_block *ubifs_get_super(struct device_d *dev, struct ubi_volume_desc return ERR_PTR(-EROFS); } + sb->s_op = &ubifs_super_operations; + mutex_lock(&c->umount_mutex); err = mount_ubifs(c); if (err) { diff --git a/include/linux/fs.h b/include/linux/fs.h index 7e9886a..9aec052 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -112,6 +112,10 @@ struct inode { void *i_private; /* fs or device private pointer */ }; +struct super_operations { + struct inode *(*alloc_inode)(struct super_block *sb); +}; + struct super_block { struct list_head s_list; /* Keep this first */ dev_t s_dev; /* search index; _not_ kdev_t */ @@ -361,4 +365,6 @@ struct file { #define I_DIRTY (I_DIRTY_SYNC | I_DIRTY_DATASYNC | I_DIRTY_PAGES) #define I_DIRTY_ALL (I_DIRTY | I_DIRTY_TIME) +extern struct inode * iget_locked(struct super_block *, unsigned long); + #endif /* _LINUX_FS_H */ -- 2.1.4 _______________________________________________ barebox mailing list barebox@lists.infradead.org http://lists.infradead.org/mailman/listinfo/barebox