From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from e5.ny.us.ibm.com ([32.97.182.145]:58731 "EHLO e5.ny.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755586Ab2JJKKG (ORCPT ); Wed, 10 Oct 2012 06:10:06 -0400 Received: from /spool/local by e5.ny.us.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Wed, 10 Oct 2012 06:09:56 -0400 From: zwu.kernel@gmail.com To: linux-fsdevel@vger.kernel.org Cc: linux-ext4@vger.kernel.org, linux-btrfs@vger.kernel.org, linux-kernel@vger.kernel.org, linuxram@linux.vnet.ibm.com, viro@zeniv.linux.org.uk, david@fromorbit.com, dave@jikos.cz, tytso@mit.edu, cmm@us.ibm.com, Zhi Yong Wu Subject: [RFC v3 11/13] vfs: add 3 new ioctl interfaces Date: Wed, 10 Oct 2012 18:07:33 +0800 Message-Id: <1349863655-29320-12-git-send-email-zwu.kernel@gmail.com> In-Reply-To: <1349863655-29320-1-git-send-email-zwu.kernel@gmail.com> References: <1349863655-29320-1-git-send-email-zwu.kernel@gmail.com> Sender: linux-btrfs-owner@vger.kernel.org List-ID: From: Zhi Yong Wu FS_IOC_GET_HEAT_INFO: return a struct containing the various metrics collected in btrfs_freq_data structs, and also return a calculated data temperature based on those metrics. Optionally, retrieve the temperature from the hot data hash list instead of recalculating it. FS_IOC_GET_HEAT_OPTS: return an integer representing the current state of hot data tracking and migration: 0 = do nothing 1 = track frequency of access FS_IOC_SET_HEAT_OPTS: change the state of hot data tracking and migration, as described above. Signed-off-by: Zhi Yong Wu --- fs/compat_ioctl.c | 9 +++ fs/ioctl.c | 122 ++++++++++++++++++++++++++++++++++++++++++ include/linux/fs.h | 1 + include/linux/hot_tracking.h | 22 ++++++++ 4 files changed, 154 insertions(+), 0 deletions(-) diff --git a/fs/compat_ioctl.c b/fs/compat_ioctl.c index f505402..820f4cc 100644 --- a/fs/compat_ioctl.c +++ b/fs/compat_ioctl.c @@ -57,6 +57,7 @@ #include #include #include +#include #include #include @@ -1398,6 +1399,11 @@ COMPATIBLE_IOCTL(TIOCSTART) COMPATIBLE_IOCTL(TIOCSTOP) #endif +/*Hot data tracking*/ +COMPATIBLE_IOCTL(FS_IOC_GET_HEAT_INFO) +COMPATIBLE_IOCTL(FS_IOC_SET_HEAT_OPTS) +COMPATIBLE_IOCTL(FS_IOC_GET_HEAT_OPTS) + /* fat 'r' ioctls. These are handled by fat with ->compat_ioctl, but we don't want warnings on other file systems. So declare them as compatible here. */ @@ -1577,6 +1583,9 @@ asmlinkage long compat_sys_ioctl(unsigned int fd, unsigned int cmd, case FIBMAP: case FIGETBSZ: case FIONREAD: + case FS_IOC_GET_HEAT_INFO: + case FS_IOC_SET_HEAT_OPTS: + case FS_IOC_GET_HEAT_OPTS: if (S_ISREG(f.file->f_path.dentry->d_inode->i_mode)) break; /*FALL THROUGH*/ diff --git a/fs/ioctl.c b/fs/ioctl.c index 3bdad6d..35127ed 100644 --- a/fs/ioctl.c +++ b/fs/ioctl.c @@ -15,6 +15,7 @@ #include #include #include +#include "hot_tracking.h" #include @@ -537,6 +538,118 @@ static int ioctl_fsthaw(struct file *filp) } /* + * Retrieve information about access frequency for the given file. Return it in + * a userspace-friendly struct for btrfsctl (or another tool) to parse. + * + * The temperature that is returned can be "live" -- that is, recalculated when + * the ioctl is called -- or it can be returned from the hashtable, reflecting + * the (possibly old) value that the system will use when considering files + * for migration. This behavior is determined by hot_heat_info->live. + */ +static int ioctl_heat_info(struct file *file, void __user *argp) +{ + struct inode *file_inode; + struct file *file_filp; + struct hot_info *root = global_hot_tracking_info; + struct hot_heat_info *heat_info; + struct hot_inode_item *he; + int ret = 0; + + heat_info = kmalloc(sizeof(struct hot_heat_info), + GFP_KERNEL | GFP_NOFS); + + if (copy_from_user((void *) heat_info, + argp, + sizeof(struct hot_heat_info)) != 0) { + ret = -EFAULT; + goto err; + } + + file_filp = filp_open(heat_info->filename, O_RDONLY, 0); + file_inode = file_filp->f_dentry->d_inode; + filp_close(file_filp, NULL); + + he = hot_inode_item_find(root, file_inode->i_ino); + if (!he) { + /* we don't have any info on this file yet */ + ret = -ENODATA; + goto err; + } + + spin_lock(&he->hot_inode.lock); + heat_info->avg_delta_reads = + (__u64) he->hot_inode.hot_freq_data.avg_delta_reads; + heat_info->avg_delta_writes = + (__u64) he->hot_inode.hot_freq_data.avg_delta_writes; + heat_info->last_read_time = + (__u64) timespec_to_ns(&he->hot_inode.hot_freq_data.last_read_time); + heat_info->last_write_time = + (__u64) timespec_to_ns(&he->hot_inode.hot_freq_data.last_write_time); + heat_info->num_reads = + (__u32) he->hot_inode.hot_freq_data.nr_reads; + heat_info->num_writes = + (__u32) he->hot_inode.hot_freq_data.nr_writes; + + if (heat_info->live > 0) { + /* + * got a request for live temperature, + * call hot_hash_calc_temperature to recalculate + */ + heat_info->temperature = + hot_temperature_calculate(&he->hot_inode.hot_freq_data); + } else { + /* not live temperature, get it from the hashlist */ + heat_info->temperature = he->hot_inode.hot_freq_data.last_temperature; + } + spin_unlock(&he->hot_inode.lock); + + hot_inode_item_put(he); + + if (copy_to_user(argp, (void *) heat_info, + sizeof(struct hot_heat_info))) { + ret = -EFAULT; + goto err; + } + +err: + kfree(heat_info); + return ret; +} + +static int ioctl_heat_opts(struct file *file, void __user *argp, int set) +{ + struct inode *inode = file->f_path.dentry->d_inode; + unsigned arg; + int ret = 0; + + if (!set) { + arg = TRACK_THIS_INODE(inode) ? 1 : 0; + + if (copy_to_user(argp, (void *) &arg, sizeof(unsigned long)) != 0) + ret = -EFAULT; + } else { + if (copy_from_user((void *) &arg, argp, sizeof(unsigned long)) != 0) { + ret = -EFAULT; + } else { + switch (arg) { + case 0: /* track nothing */ + /* set S_NOHOTDATATRACK */ + inode->i_flags |= S_NOHOTDATATRACK; + break; + case 1: /* do tracking */ + /* clear S_NOHOTDATATRACK */ + inode->i_flags &= ~S_NOHOTDATATRACK; + break; + default: + ret = -EINVAL; + } + } + } + + return ret; +} + +/* * When you add any new common ioctls to the switches above and below * please update compat_sys_ioctl() too. * @@ -591,6 +704,15 @@ int do_vfs_ioctl(struct file *filp, unsigned int fd, unsigned int cmd, case FIGETBSZ: return put_user(inode->i_sb->s_blocksize, argp); + case FS_IOC_GET_HEAT_INFO: + return ioctl_heat_info(filp, argp); + + case FS_IOC_SET_HEAT_OPTS: + return ioctl_heat_opts(filp, argp, 1); + + case FS_IOC_GET_HEAT_OPTS: + return ioctl_heat_opts(filp, argp, 0); + default: if (S_ISREG(inode->i_mode)) error = file_ioctl(filp, cmd, arg); diff --git a/include/linux/fs.h b/include/linux/fs.h index 3b1a389..c2e2d0f 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -256,6 +256,7 @@ struct inodes_stat_t { #define S_IMA 1024 /* Inode has an associated IMA struct */ #define S_AUTOMOUNT 2048 /* Automount/referral quasi-directory */ #define S_NOSEC 4096 /* no suid or xattr security attributes */ +#define S_NOHOTDATATRACK (1 << 13) /* hot data tracking */ /* * Note that nosuid etc flags are inode-specific: setting some file-system diff --git a/include/linux/hot_tracking.h b/include/linux/hot_tracking.h index 6f31090..e3ca136 100644 --- a/include/linux/hot_tracking.h +++ b/include/linux/hot_tracking.h @@ -41,6 +41,18 @@ struct hot_freq_data { u32 last_temperature; }; +struct hot_heat_info { + __u64 avg_delta_reads; + __u64 avg_delta_writes; + __u64 last_read_time; + __u64 last_write_time; + __u32 num_reads; + __u32 num_writes; + __u32 temperature; + __u8 live; + char filename[PATH_MAX]; +}; + /* List heads in hot map array */ struct hot_map_head { struct list_head node_list; @@ -89,6 +101,16 @@ struct hot_info { struct shrinker hot_shrink; }; +/* + * Hot data tracking ioctls: + * + * HOT_INFO - retrieve info on frequency of access + */ +#define FS_IOC_GET_HEAT_INFO _IOR('f', 17, \ + struct hot_heat_info) +#define FS_IOC_SET_HEAT_OPTS _IOW('f', 18, unsigned long) +#define FS_IOC_GET_HEAT_OPTS _IOR('f', 19, unsigned long) + extern struct hot_info *global_hot_tracking_info; extern void hot_track_init(struct super_block *sb); -- 1.7.6.5