From: Akira Fujita Subject: [RFC][PATCH 7/7]ext4: Add EXT4_IOC_PRINT_INODE_ARULE for debug inode preferred range of blocks Date: Tue, 23 Jun 2009 17:26:18 +0900 Message-ID: <4A4091AA.2040405@rs.jp.nec.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-2022-JP Content-Transfer-Encoding: 7bit Cc: linux-fsdevel@vger.kernel.org To: Theodore Tso , linux-ext4@vger.kernel.org Return-path: Received: from TYO201.gate.nec.co.jp ([202.32.8.193]:38752 "EHLO tyo201.gate.nec.co.jp" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758076AbZFWI17 (ORCPT ); Tue, 23 Jun 2009 04:27:59 -0400 Sender: linux-ext4-owner@vger.kernel.org List-ID: ext4: Add EXT4_IOC_PRINT_INODE_ARULE for debug inode preferred range of blocks From: Akira Fujita # This is a debug ioctl for inode preferred range of blocks. EXT4_IOC_PRINT_INODE_ARULE ioctl prints the information of preferred block allocation for specified inode to syslog. #define EXT4_IOC_PRINT_INODE_ARULE _IO('f', 20 ) This information consist of following four entries. - inode number (e.g. ino=11) - start physical offset of this rule - block length this rule covers - flag (0: mandatory, 1: advisory) e.g. ARULE: ino=11 start=6000 len=1000 flag=0 The above means the inode (ino=11) is set preferred block allocation from 6000 to 6999 with mandatory. Therefore block allocator is forced to use blocks from 6000 to 6999 and if could not use this range, return -ENOSPC. Note: Preferred block allocation is disabled when inode reference counter is 0 or umount FS. Signed-off-by: Akira Fujita Signed-off-by: Kazuya Mio --- fs/ext4/ext4.h | 2 ++ fs/ext4/ioctl.c | 5 +++++ fs/ext4/mballoc.c | 20 ++++++++++++++++++++ 3 files changed, 27 insertions(+), 0 deletions(-) diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h index 4ed4b27..4e94960 100644 --- a/fs/ext4/ext4.h +++ b/fs/ext4/ext4.h @@ -363,6 +363,7 @@ struct ext4_new_group_data { #define EXT4_IOC_CLR_GLOBAL_ALLOC_RULE _IOW('f', 17, struct ext4_alloc_rule) #define EXT4_IOC_ADD_INODE_ALLOC_RULE _IOW('f', 18, struct ext4_alloc_rule) #define EXT4_IOC_PRINT_GLOBAL_ARULE _IO('f', 19) +#define EXT4_IOC_PRINT_INODE_ARULE _IO('f', 20) /* * ioctl commands in 32 bit emulation @@ -1406,6 +1407,7 @@ extern int ext4_mb_add_inode_arule(struct inode *inode, extern void ext4_mb_del_inode_arule(struct inode *inode); extern void ext4_mb_dec_inode_arule(struct inode *inode, unsigned int len); extern void ext4_mb_print_global_arule(struct inode *inode); +extern void ext4_mb_print_inode_arule(struct inode *inode); /* inode.c */ int ext4_forget(handle_t *handle, int is_metadata, struct inode *inode, diff --git a/fs/ext4/ioctl.c b/fs/ext4/ioctl.c index 323e3d2..9808dd4 100644 --- a/fs/ext4/ioctl.c +++ b/fs/ext4/ioctl.c @@ -323,6 +323,11 @@ setversion_out: return 0; } + case EXT4_IOC_PRINT_INODE_ARULE: { + ext4_mb_print_inode_arule(inode); + return 0; + } + case EXT4_IOC_GROUP_ADD: { struct ext4_new_group_data input; struct super_block *sb = inode->i_sb; diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c index cd5b833..bfe633e 100644 --- a/fs/ext4/mballoc.c +++ b/fs/ext4/mballoc.c @@ -5859,3 +5859,23 @@ void ext4_mb_print_global_arule(struct inode *inode) return; } + +void ext4_mb_print_inode_arule(struct inode *inode) +{ + struct ext4_inode_info *ei = EXT4_I(inode); + struct ext4_alloc_rule *arule = NULL; + + if (ei->i_alloc_rule == NULL) + printk(KERN_ERR "ARULE: ino=%lu alloc_rule is empty\n", + inode->i_ino); + else { + arule = &(ei->i_alloc_rule)->alloc_rule; + printk(KERN_ERR "ARULE: ino=%lu start=%llu len=%llu " + "flag=%u\n", inode->i_ino, + (ext4_fsblk_t)arule->start, + (ext4_fsblk_t)arule->len, + (unsigned)arule->alloc_flag); + } + + return; +}