- The rt_alloc_min sysfs option automatically selects the device (data device, or realtime) based on the size of the initial allocation of the file. - This option can be used to route the storage of small files (and the inefficient workloads associated with them) to a suitable storage device such a SSD, while larger allocations are sent to a traditional HDD. - Supports writes via O_DIRECT, buffered (i.e. page cache), and pre-allocations (i.e. fallocate) - Available only when kernel is compiled w/ CONFIG_XFS_RT option. Signed-off-by: Richard Wareing <rwareing@xxxxxx> --- Changes since v6: * None Changes since v5: * xfs_inode_select_target renamed to xfs_inode_select_rt_target and returns boolean to indicate if realtime device target is desired. * Introduction of XFS_BMAPI_RTDATA which provides signal to the xfs_bmapi_allocate function the realtime flag must be set on the inode & the inode logged. * Manual setting of the realtime flag by ioctl or directory rt inherit flag now takes precedence over the policy. * Documentation Changes since v4: * Added xfs_inode_select_target function to hold target selection code * XFS_IS_REALTIME_MOUNT check now moved inside xfs_inode_select_target function for better gating * Improved consistency in the sysfs set behavior * Style fixes Changes since v3: * Now functions via initial allocation regardless of O_DIRECT, buffered or pre-allocation code paths. Provides a consistent user-experience. * I Did do some experiments putting this in the xfs_bmapi_write code path however pre-allocation accounting unfortunately prevents this cleaner approach. As such, this proved to be the cleanest and functional approach. * No longer a mount option, now a sysfs tunable Documentation/filesystems/xfs.txt | 21 +++++++++++++++- fs/xfs/libxfs/xfs_bmap.c | 35 +++++++++++++++++++++++++++ fs/xfs/libxfs/xfs_bmap.h | 3 +++ fs/xfs/xfs_bmap_util.c | 3 +++ fs/xfs/xfs_inode.c | 6 +++++ fs/xfs/xfs_iomap.c | 18 ++++++++++++-- fs/xfs/xfs_mount.h | 1 + fs/xfs/xfs_rtalloc.c | 50 +++++++++++++++++++++++++++++++++++++++ fs/xfs/xfs_rtalloc.h | 2 ++ fs/xfs/xfs_sysfs.c | 42 ++++++++++++++++++++++++++++++++ 10 files changed, 178 insertions(+), 3 deletions(-) diff --git a/Documentation/filesystems/xfs.txt b/Documentation/filesystems/xfs.txt index 3b9b5c1..0763972 100644 --- a/Documentation/filesystems/xfs.txt +++ b/Documentation/filesystems/xfs.txt @@ -94,7 +94,7 @@ default behaviour. When inode64 is specified, it indicates that XFS is allowed to create inodes at any location in the filesystem, including those which will result in inode numbers occupying - more than 32 bits of significance. + more than 32 bits of significance. inode32 is provided for backwards compatibility with older systems and applications, since 64 bits inode numbers might @@ -467,3 +467,22 @@ the class and error context. For example, the default values for "metadata/ENODEV" are "0" rather than "-1" so that this error handler defaults to "fail immediately" behaviour. This is done because ENODEV is a fatal, unrecoverable error no matter how many times the metadata IO is retried. + +Realtime Device Sysfs Options +============================= + +When using a realtime sub-volume, the following sysfs options are supported: + + /sys/fs/xfs/<dev>/rt_alloc_min + (Units: bytes Min: 0 Default: 0 Max: INT_MAX) + When set, the file will be allocated blocks from the realtime device if the + initial allocation request size (in bytes) is equal to or above this value. + For XFS use-cases where appends are unlikely or not supported, this option + can be used to place smaller files on a the data device (typically an SSD), + while larger files are placed on the realtime device (typically an HDD). + + Any files which have the realtime flag set by an ioctl call or realtime + inheritance flag on the directory will not be affected by this option. + Buffered, direct IO and pre-allocation are supported. + + Setting the value to "0" disables this behavior. diff --git a/fs/xfs/libxfs/xfs_bmap.c b/fs/xfs/libxfs/xfs_bmap.c index 8926379..dd02a52 100644 --- a/fs/xfs/libxfs/xfs_bmap.c +++ b/fs/xfs/libxfs/xfs_bmap.c @@ -4188,6 +4188,39 @@ xfs_bmapi_reserve_delalloc( return error; } +/* + * This function will set the XFS_DIFLAG_REALTIME flag on the inode if + * the XFS_BMAPI_RTDATA flag is set on the xfs_bmalloca struct. + * + * This function is only valid for realtime mounts, and only on the initial + * allocation for the file. + * + */ +void +xfs_bmapi_rt_data_flag( + struct xfs_mount *mp, + struct xfs_bmalloca *bma) +{ + + /* Only valid if this is a realtime mount */ + if (!XFS_IS_REALTIME_MOUNT(mp)) + return; + + /* Only valid if file is empty */ + if (!(bma->datatype & XFS_ALLOC_INITIAL_USER_DATA)) + return; + + /* Nothing to do, realtime flag already set */ + if (bma->ip->i_d.di_flags & XFS_DIFLAG_REALTIME) + return; + + /* Set realtime flag and log it if RTDATA flag is set */ + if (bma->flags & XFS_BMAPI_RTDATA) { + bma->ip->i_d.di_flags |= XFS_DIFLAG_REALTIME; + bma->logflags |= XFS_ILOG_CORE; + } +} + static int xfs_bmapi_allocate( struct xfs_bmalloca *bma) @@ -4238,6 +4271,8 @@ xfs_bmapi_allocate( bma->minlen = (bma->flags & XFS_BMAPI_CONTIG) ? bma->length : 1; + xfs_bmapi_rt_data_flag(mp, bma); + /* * Only want to do the alignment at the eof if it is userdata and * allocation length is larger than a stripe unit. diff --git a/fs/xfs/libxfs/xfs_bmap.h b/fs/xfs/libxfs/xfs_bmap.h index 502e0d8..6f67588 100644 --- a/fs/xfs/libxfs/xfs_bmap.h +++ b/fs/xfs/libxfs/xfs_bmap.h @@ -113,6 +113,9 @@ struct xfs_extent_free_item /* Only convert delalloc space, don't allocate entirely new extents */ #define XFS_BMAPI_DELALLOC 0x400 +/* Allocate to realtime device */ +#define XFS_BMAPI_RTDATA 0x800 + #define XFS_BMAPI_FLAGS \ { XFS_BMAPI_ENTIRE, "ENTIRE" }, \ { XFS_BMAPI_METADATA, "METADATA" }, \ diff --git a/fs/xfs/xfs_bmap_util.c b/fs/xfs/xfs_bmap_util.c index 6503cfa..b04363b 100644 --- a/fs/xfs/xfs_bmap_util.c +++ b/fs/xfs/xfs_bmap_util.c @@ -1053,6 +1053,9 @@ xfs_alloc_file_space( return -EINVAL; rt = XFS_IS_REALTIME_INODE(ip); + if (!rt && (rt = xfs_inode_select_rt_target(ip, len))) + alloc_type |= XFS_BMAPI_RTDATA; + extsz = xfs_get_extsz_hint(ip); count = len; diff --git a/fs/xfs/xfs_inode.c b/fs/xfs/xfs_inode.c index 4ec5b7f..ed29549 100644 --- a/fs/xfs/xfs_inode.c +++ b/fs/xfs/xfs_inode.c @@ -1633,6 +1633,12 @@ xfs_itruncate_extents( xfs_inode_clear_cowblocks_tag(ip); } + if (ip->i_d.di_nblocks == 0 && XFS_IS_REALTIME_MOUNT(mp) && + mp->m_rt_alloc_min) { + /* Clear realtime flag if m_rt_alloc_min policy is in place */ + ip->i_d.di_flags &= ~XFS_DIFLAG_REALTIME; + } + /* * Always re-log the inode so that our permanent transaction can keep * on rolling it forward in the log. diff --git a/fs/xfs/xfs_iomap.c b/fs/xfs/xfs_iomap.c index f179bdf..518a9bb 100644 --- a/fs/xfs/xfs_iomap.c +++ b/fs/xfs/xfs_iomap.c @@ -40,6 +40,7 @@ #include "xfs_dquot_item.h" #include "xfs_dquot.h" #include "xfs_reflink.h" +#include "xfs_rtalloc.h" #define XFS_WRITEIO_ALIGN(mp,off) (((off) >> mp->m_writeio_log) \ @@ -175,7 +176,11 @@ xfs_iomap_write_direct( int bmapi_flags = XFS_BMAPI_PREALLOC; uint tflags = 0; + rt = XFS_IS_REALTIME_INODE(ip); + if (!rt && (rt = xfs_inode_select_rt_target(ip, count))) + bmapi_flags |= XFS_BMAPI_RTDATA; + extsz = xfs_get_extsz_hint(ip); lockmode = XFS_ILOCK_SHARED; /* locked by caller */ @@ -985,8 +990,17 @@ xfs_file_iomap_begin( if (((flags & (IOMAP_WRITE | IOMAP_DIRECT)) == IOMAP_WRITE) && !IS_DAX(inode) && !xfs_get_extsz_hint(ip)) { - /* Reserve delalloc blocks for regular writeback. */ - return xfs_file_iomap_begin_delay(inode, offset, length, iomap); + /* + * For non-odirect writes, check if this will be allocated to + * realtime, if so we by-pass xfs_file_iomap_begin_delay as if + * the inode was already marked realtime (see xfs_get_extsz_hint). + * The actual setting of the realtime flag on the inode will be + * done later on. + */ + if (!xfs_inode_select_rt_target(ip, XFS_FSB_TO_B(mp, length))) + /* Reserve delalloc blocks for regular writeback. */ + return xfs_file_iomap_begin_delay(inode, offset, length, + iomap); } if (need_excl_ilock(ip, flags)) { diff --git a/fs/xfs/xfs_mount.h b/fs/xfs/xfs_mount.h index e0792d0..0db9731 100644 --- a/fs/xfs/xfs_mount.h +++ b/fs/xfs/xfs_mount.h @@ -197,6 +197,7 @@ typedef struct xfs_mount { uint32_t m_generation; bool m_fail_unmount; + xfs_off_t m_rt_alloc_min; /* Min RT allocation */ #ifdef DEBUG /* * Frequency with which errors are injected. Replaces xfs_etest; the diff --git a/fs/xfs/xfs_rtalloc.c b/fs/xfs/xfs_rtalloc.c index 488719d..145007b 100644 --- a/fs/xfs/xfs_rtalloc.c +++ b/fs/xfs/xfs_rtalloc.c @@ -1284,3 +1284,53 @@ xfs_rtpick_extent( *pick = b; return 0; } + +/* + * If allocation length is less than rt_alloc_min threshold select the + * data device. Otherwise, select the realtime device. + */ +bool +xfs_rt_alloc_min( + struct xfs_mount *mp, + xfs_off_t len) +{ + if (!mp->m_rt_alloc_min) + return false; + + if (len >= mp->m_rt_alloc_min) + return true; + + return false; +} + +/* +* Select the target device for the inode based on either the size of the +* initial allocation, or the amount of space available on the data device. +* +*/ +bool +xfs_inode_select_rt_target( + struct xfs_inode *ip, + xfs_off_t len) +{ + struct xfs_mount *mp = ip->i_mount; + + /* If the mount does not have a realtime device configured, there's + * nothing to do here. + */ + if (!XFS_IS_REALTIME_MOUNT(mp)) + return false; + + /* You cannot select a new device target once blocks have been allocated + * (e.g. fallocate() beyond EOF), or if data has been written already. + */ + if (ip->i_d.di_nextents) + return false; + if (ip->i_d.di_size) + return false; + + /* Select realtime device as our target based on the value of + * mp->m_rt_alloc_min. Target selection code if not valid if not set. + */ + return xfs_rt_alloc_min(mp, len); +} diff --git a/fs/xfs/xfs_rtalloc.h b/fs/xfs/xfs_rtalloc.h index 79defa7..4f058b5 100644 --- a/fs/xfs/xfs_rtalloc.h +++ b/fs/xfs/xfs_rtalloc.h @@ -138,6 +138,7 @@ int xfs_rtalloc_query_range(struct xfs_trans *tp, int xfs_rtalloc_query_all(struct xfs_trans *tp, xfs_rtalloc_query_range_fn fn, void *priv); +bool xfs_inode_select_rt_target(struct xfs_inode *ip, xfs_off_t len); #else # define xfs_rtallocate_extent(t,b,min,max,l,f,p,rb) (ENOSYS) # define xfs_rtfree_extent(t,b,l) (ENOSYS) @@ -158,6 +159,7 @@ xfs_rtmount_init( } # define xfs_rtmount_inodes(m) (((mp)->m_sb.sb_rblocks == 0)? 0 : (ENOSYS)) # define xfs_rtunmount_inodes(m) +# define xfs_inode_select_rt_target(i,l) (0) #endif /* CONFIG_XFS_RT */ #endif /* __XFS_RTALLOC_H__ */ diff --git a/fs/xfs/xfs_sysfs.c b/fs/xfs/xfs_sysfs.c index 8b2ccc2..8b425be 100644 --- a/fs/xfs/xfs_sysfs.c +++ b/fs/xfs/xfs_sysfs.c @@ -90,7 +90,49 @@ to_mp(struct kobject *kobject) return container_of(kobj, struct xfs_mount, m_kobj); } +#ifdef CONFIG_XFS_RT +STATIC ssize_t +rt_alloc_min_store( + struct kobject *kobject, + const char *buf, + size_t count) +{ + struct xfs_mount *mp = to_mp(kobject); + int ret; + int val; + + ret = kstrtoint(buf, 0, &val); + if (ret) + return ret; + + /* Only valid if using a real-time device */ + if(!XFS_IS_REALTIME_MOUNT(mp)) + return -EINVAL; + + if (val >= 0) + mp->m_rt_alloc_min = val; + else + return -EINVAL; + + return count; +} + +STATIC ssize_t +rt_alloc_min_show( + struct kobject *kobject, + char *buf) +{ + struct xfs_mount *mp = to_mp(kobject); + + return snprintf(buf, PAGE_SIZE, "%lld\n", mp->m_rt_alloc_min); +} +XFS_SYSFS_ATTR_RW(rt_alloc_min); +#endif + static struct attribute *xfs_mp_attrs[] = { +#ifdef CONFIG_XFS_RT + ATTR_LIST(rt_alloc_min), +#endif NULL, }; -- 2.9.5 -- To unsubscribe from this list: send the line "unsubscribe linux-xfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html