From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from userp1040.oracle.com ([156.151.31.81]:26530 "EHLO userp1040.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750712AbcGWE2j (ORCPT ); Sat, 23 Jul 2016 00:28:39 -0400 Date: Fri, 22 Jul 2016 21:28:12 -0700 From: "Darrick J. Wong" To: david@fromorbit.com Cc: linux-fsdevel@vger.kernel.org, vishal.l.verma@intel.com, bfoster@redhat.com, xfs@oss.sgi.com Subject: [PATCH v2 47/47] xfs: introduce the XFS_IOC_GETFSMAP ioctl Message-ID: <20160723042812.GA4684@birch.djwong.org> References: <146907695530.25461.3225785294902719773.stgit@birch.djwong.org> <146907727500.25461.15944158970310442107.stgit@birch.djwong.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <146907727500.25461.15944158970310442107.stgit@birch.djwong.org> Sender: linux-fsdevel-owner@vger.kernel.org List-ID: Introduce a new ioctl that uses the reverse mapping btree to return information about the physical layout of the filesystem. v2: shorten the device field to u32 since that's all we need for dev_t. Support reporting reverse mapping information for all the devices that XFS supports (data, log). v3: don't call the function that reports the journalling log rmap if we don't have an external device, since the regular rmapbt will take care of that. Signed-off-by: Darrick J. Wong --- fs/xfs/libxfs/xfs_fs.h | 65 ++++++ fs/xfs/xfs_fsops.c | 528 ++++++++++++++++++++++++++++++++++++++++++++++++ fs/xfs/xfs_fsops.h | 6 + fs/xfs/xfs_ioctl.c | 76 +++++++ fs/xfs/xfs_ioctl32.c | 1 fs/xfs/xfs_trace.h | 76 +++++++ 6 files changed, 752 insertions(+) diff --git a/fs/xfs/libxfs/xfs_fs.h b/fs/xfs/libxfs/xfs_fs.h index 7945505..b08f23d 100644 --- a/fs/xfs/libxfs/xfs_fs.h +++ b/fs/xfs/libxfs/xfs_fs.h @@ -91,6 +91,70 @@ struct getbmapx { #define BMV_OF_LAST 0x4 /* segment is the last in the file */ /* + * Structure for XFS_IOC_GETFSMAP. + * + * Similar to XFS_IOC_GETBMAPX, the first two elements in the array are + * used to constrain the output. The first element in the array should + * represent the lowest disk address that the user wants to learn about. + * The second element in the array should represent the highest disk + * address to query. Subsequent array elements will be filled out by the + * command. + * + * The fmv_iflags field is only used in the first structure. The + * fmv_oflags field is filled in for each returned structure after the + * second structure. The fmv_unused1 fields in the first two array + * elements must be zero. + * + * The fmv_count, fmv_entries, and fmv_iflags fields in the second array + * element must be zero. + * + * fmv_block, fmv_offset, and fmv_length are expressed in units of 512 + * byte sectors. + */ +#ifndef HAVE_GETFSMAP +struct getfsmap { + __u32 fmv_device; /* device id */ + __u32 fmv_unused1; /* future use, must be zero */ + __u64 fmv_block; /* starting block */ + __u64 fmv_owner; /* owner id */ + __u64 fmv_offset; /* file offset of segment */ + __u64 fmv_length; /* length of segment, blocks */ + __u32 fmv_oflags; /* mapping flags */ + __u32 fmv_iflags; /* control flags (1st structure) */ + __u32 fmv_count; /* # of entries in array incl. input */ + __u32 fmv_entries; /* # of entries filled in (output). */ + __u64 fmv_unused2; /* future use, must be zero */ +}; +#endif + +/* fmv_iflags values - set by XFS_IOC_GETFSMAP caller in the header. */ +/* no flags defined yet */ +#define FMV_HIF_VALID 0 + +/* fmv_oflags values - returned in the header segment only. */ +#define FMV_HOF_DEV_T 0x1 /* fmv_device values will be dev_t */ + +/* fmv_flags values - returned for each non-header segment */ +#define FMV_OF_PREALLOC 0x1 /* segment = unwritten pre-allocation */ +#define FMV_OF_ATTR_FORK 0x2 /* segment = attribute fork */ +#define FMV_OF_EXTENT_MAP 0x4 /* segment = extent map */ +#define FMV_OF_SHARED 0x8 /* segment = shared with another file */ +#define FMV_OF_SPECIAL_OWNER 0x10 /* owner is a special value */ +#define FMV_OF_LAST 0x20 /* segment is the last in the FS */ + +/* fmv_owner special values */ +#define FMV_OWN_FREE (-1ULL) /* free space */ +#define FMV_OWN_UNKNOWN (-2ULL) /* unknown owner */ +#define FMV_OWN_FS (-3ULL) /* static fs metadata */ +#define FMV_OWN_LOG (-4ULL) /* journalling log */ +#define FMV_OWN_AG (-5ULL) /* per-AG metadata */ +#define FMV_OWN_INOBT (-6ULL) /* inode btree blocks */ +#define FMV_OWN_INODES (-7ULL) /* inodes */ +#define FMV_OWN_REFC (-8ULL) /* refcount tree */ +#define FMV_OWN_COW (-9ULL) /* cow staging */ +#define FMV_OWN_DEFECTIVE (-10ULL) /* bad blocks */ + +/* * Structure for XFS_IOC_FSSETDM. * For use by backup and restore programs to set the XFS on-disk inode * fields di_dmevmask and di_dmstate. These must be set to exactly and @@ -498,6 +562,7 @@ typedef struct xfs_swapext #define XFS_IOC_GETBMAPX _IOWR('X', 56, struct getbmap) #define XFS_IOC_ZERO_RANGE _IOW ('X', 57, struct xfs_flock64) #define XFS_IOC_FREE_EOFBLOCKS _IOR ('X', 58, struct xfs_fs_eofblocks) +#define XFS_IOC_GETFSMAP _IOWR('X', 59, struct getfsmap) /* * ioctl commands that replace IRIX syssgi()'s diff --git a/fs/xfs/xfs_fsops.c b/fs/xfs/xfs_fsops.c index 0f96847..39a4231 100644 --- a/fs/xfs/xfs_fsops.c +++ b/fs/xfs/xfs_fsops.c @@ -43,6 +43,7 @@ #include "xfs_log.h" #include "xfs_filestream.h" #include "xfs_rmap.h" +#include "xfs_bit.h" /* * File system operations @@ -947,3 +948,530 @@ xfs_do_force_shutdown( "Please umount the filesystem and rectify the problem(s)"); } } + +/* getfsmap query state */ +struct xfs_getfsmap_info { + struct getfsmap *fmv; /* vector header */ + xfs_fsmap_format_t formatter; /* formatting fn */ + void *format_arg; /* format buffer */ + bool last; /* last extent? */ + xfs_daddr_t next_daddr; /* next daddr we expect */ + u32 dev; /* device id */ + + xfs_agnumber_t agno; /* AG number, if applicable */ + struct xfs_buf *agbp; /* AGF, for refcount queries */ + struct xfs_rmap_irec low; /* low rmap key */ + struct xfs_rmap_irec high; /* high rmap key */ +}; + +/* Associate a device with a getfsmap handler. */ +struct xfs_getfsmap_dev { + u32 dev; + int (*fn)(struct xfs_mount *mp, + struct getfsmap *keys, + struct xfs_getfsmap_info *info); +}; + +/* Compare two getfsmap device handlers. */ +static int +xfs_getfsmap_dev_compare( + const void *p1, + const void *p2) +{ + const struct xfs_getfsmap_dev *d1 = p1; + const struct xfs_getfsmap_dev *d2 = p2; + + return d1->dev - d2->dev; +} + +/* Compare a record against our starting point */ +static bool +xfs_getfsmap_rec_before_low_key( + struct xfs_getfsmap_info *info, + struct xfs_rmap_irec *rec) +{ + uint64_t x, y; + + if (rec->rm_startblock < info->low.rm_startblock) + return true; + if (rec->rm_startblock > info->low.rm_startblock) + return false; + + if (rec->rm_owner < info->low.rm_owner) + return true; + if (rec->rm_owner > info->low.rm_owner) + return false; + + x = xfs_rmap_irec_offset_pack(rec); + y = xfs_rmap_irec_offset_pack(&info->low); + if (x < y) + return true; + return false; +} + +/* + * Format a reverse mapping for getfsmap, having translated rm_startblock + * into the appropriate daddr units. + */ +STATIC int +xfs_getfsmap_helper( + struct xfs_mount *mp, + struct xfs_getfsmap_info *info, + struct xfs_rmap_irec *rec, + xfs_daddr_t rec_daddr) +{ + struct getfsmap fmv; + xfs_daddr_t key_end; + int error; + + /* + * Filter out records that start before our startpoint, if the + * caller requested that. + */ + if (info->fmv->fmv_length && + xfs_getfsmap_rec_before_low_key(info, rec)) { + rec_daddr += XFS_FSB_TO_BB(mp, rec->rm_blockcount); + if (info->next_daddr < rec_daddr) + info->next_daddr = rec_daddr; + return XFS_BTREE_QUERY_RANGE_CONTINUE; + } + + /* + * If the caller passed in a length with the low record and + * the record represents a file data extent, we incremented + * the offset in the low key by the length in the hopes of + * finding reverse mappings for the physical blocks we just + * saw. We did /not/ increment next_daddr by the length + * because the range query would not be able to find shared + * extents within the same physical block range. + * + * However, the extent we've been fed could have a startblock + * past the passed-in low record. If this is the case, + * advance next_daddr to the end of the passed-in low record + * so we don't report the extent prior to this extent as + * free. + */ + key_end = info->fmv->fmv_block + info->fmv->fmv_length; + if (info->next_daddr < key_end && rec_daddr >= key_end) + info->next_daddr = key_end; + + /* Are we just counting mappings? */ + if (info->fmv->fmv_count == 2) { + if (rec_daddr > info->next_daddr) + info->fmv->fmv_entries++; + + if (info->last) + return XFS_BTREE_QUERY_RANGE_CONTINUE; + + info->fmv->fmv_entries++; + + rec_daddr += XFS_FSB_TO_BB(mp, rec->rm_blockcount); + if (info->next_daddr < rec_daddr) + info->next_daddr = rec_daddr; + return XFS_BTREE_QUERY_RANGE_CONTINUE; + } + + /* + * If the record starts past the last physical block we saw, + * then we've found some free space. Report that too. + */ + if (rec_daddr > info->next_daddr) { + if (info->fmv->fmv_entries >= info->fmv->fmv_count - 2) + return XFS_BTREE_QUERY_RANGE_ABORT; + + trace_xfs_fsmap_mapping(mp, info->agno, + XFS_DADDR_TO_FSB(mp, info->next_daddr), + XFS_DADDR_TO_FSB(mp, rec_daddr - + info->next_daddr), + FMV_OWN_FREE, 0); + + fmv.fmv_device = info->dev; + fmv.fmv_block = info->next_daddr; + fmv.fmv_owner = FMV_OWN_FREE; + fmv.fmv_offset = 0; + fmv.fmv_length = rec_daddr - info->next_daddr; + fmv.fmv_oflags = FMV_OF_SPECIAL_OWNER; + fmv.fmv_count = 0; + fmv.fmv_entries = 0; + fmv.fmv_unused1 = 0; + fmv.fmv_unused2 = 0; + error = info->formatter(&fmv, info->format_arg); + if (error) + return error; + info->fmv->fmv_entries++; + } + + if (info->last) + goto out; + + /* Fill out the extent we found */ + if (info->fmv->fmv_entries >= info->fmv->fmv_count - 2) + return XFS_BTREE_QUERY_RANGE_ABORT; + + trace_xfs_fsmap_mapping(mp, info->agno, + rec->rm_startblock, rec->rm_blockcount, rec->rm_owner, + rec->rm_offset); + + fmv.fmv_device = info->dev; + fmv.fmv_block = rec_daddr; + fmv.fmv_owner = rec->rm_owner; + fmv.fmv_offset = XFS_FSB_TO_BB(mp, rec->rm_offset); + fmv.fmv_length = XFS_FSB_TO_BB(mp, rec->rm_blockcount); + fmv.fmv_oflags = 0; + fmv.fmv_count = 0; + fmv.fmv_entries = 0; + fmv.fmv_unused1 = 0; + fmv.fmv_unused2 = 0; + if (XFS_RMAP_NON_INODE_OWNER(rec->rm_owner)) + fmv.fmv_oflags |= FMV_OF_SPECIAL_OWNER; + if (rec->rm_flags & XFS_RMAP_UNWRITTEN) + fmv.fmv_oflags |= FMV_OF_PREALLOC; + if (rec->rm_flags & XFS_RMAP_ATTR_FORK) + fmv.fmv_oflags |= FMV_OF_ATTR_FORK; + if (rec->rm_flags & XFS_RMAP_BMBT_BLOCK) + fmv.fmv_oflags |= FMV_OF_EXTENT_MAP; + error = info->formatter(&fmv, info->format_arg); + if (error) + return error; + info->fmv->fmv_entries++; + +out: + rec_daddr += XFS_FSB_TO_BB(mp, rec->rm_blockcount); + if (info->next_daddr < rec_daddr) + info->next_daddr = rec_daddr; + return XFS_BTREE_QUERY_RANGE_CONTINUE; +} + +/* Transform a rmapbt irec into a fsmap */ +STATIC int +xfs_getfsmap_datadev_helper( + struct xfs_btree_cur *cur, + struct xfs_rmap_irec *rec, + void *priv) +{ + struct xfs_mount *mp = cur->bc_mp; + struct xfs_getfsmap_info *info = priv; + xfs_fsblock_t fsb; + xfs_daddr_t rec_daddr; + + fsb = XFS_AGB_TO_FSB(mp, cur->bc_private.a.agno, + rec->rm_startblock); + rec_daddr = XFS_FSB_TO_DADDR(mp, fsb); + + return xfs_getfsmap_helper(mp, info, rec, rec_daddr); +} + +/* Transform a absolute-startblock rmap (rtdev, logdev) into a fsmap */ +STATIC int +xfs_getfsmap_rtdev_helper( + struct xfs_btree_cur *cur, + struct xfs_rmap_irec *rec, + void *priv) +{ + struct xfs_mount *mp = cur->bc_mp; + struct xfs_getfsmap_info *info = priv; + xfs_daddr_t rec_daddr; + + rec_daddr = XFS_FSB_TO_BB(mp, rec->rm_startblock); + + return xfs_getfsmap_helper(mp, info, rec, rec_daddr); +} + +/* Set rmap flags based on the getfsmap flags */ +static void +xfs_getfsmap_set_irec_flags( + struct xfs_rmap_irec *irec, + struct getfsmap *fmv) +{ + irec->rm_flags = 0; + if (fmv->fmv_oflags & FMV_OF_ATTR_FORK) + irec->rm_flags |= XFS_RMAP_ATTR_FORK; + if (fmv->fmv_oflags & FMV_OF_EXTENT_MAP) + irec->rm_flags |= XFS_RMAP_BMBT_BLOCK; + if (fmv->fmv_oflags & FMV_OF_PREALLOC) + irec->rm_flags |= XFS_RMAP_UNWRITTEN; +} + +/* Execute a getfsmap query against the log device. */ +STATIC int +xfs_getfsmap_logdev( + struct xfs_mount *mp, + struct getfsmap *keys, + struct xfs_getfsmap_info *info) +{ + struct xfs_btree_cur cur; + struct getfsmap *lowkey = keys; + struct xfs_rmap_irec rmap; + + /* Set up search keys */ + info->low.rm_startblock = XFS_BB_TO_FSBT(mp, lowkey->fmv_block); + info->low.rm_offset = XFS_BB_TO_FSBT(mp, lowkey->fmv_offset); + info->low.rm_owner = lowkey->fmv_owner; + info->low.rm_blockcount = 0; + xfs_getfsmap_set_irec_flags(&info->low, lowkey); + + info->high.rm_startblock = -1U; + info->high.rm_owner = ULLONG_MAX; + info->high.rm_offset = ULLONG_MAX; + info->high.rm_blockcount = 0; + info->high.rm_flags = XFS_RMAP_KEY_FLAGS | XFS_RMAP_REC_FLAGS; + + trace_xfs_fsmap_low_key(mp, info->agno, + info->low.rm_startblock, + info->low.rm_blockcount, + info->low.rm_owner, + info->low.rm_offset); + + trace_xfs_fsmap_high_key(mp, info->agno, + info->high.rm_startblock, + info->high.rm_blockcount, + info->high.rm_owner, + info->high.rm_offset); + + + if (lowkey->fmv_block > 0) + return 0; + + rmap.rm_startblock = 0; + rmap.rm_blockcount = mp->m_sb.sb_logblocks; + rmap.rm_owner = XFS_RMAP_OWN_LOG; + rmap.rm_offset = 0; + rmap.rm_flags = 0; + + cur.bc_mp = mp; + return xfs_getfsmap_rtdev_helper(&cur, &rmap, info); +} + +/* Execute a getfsmap query against the regular data device. */ +STATIC int +xfs_getfsmap_datadev( + struct xfs_mount *mp, + struct getfsmap *keys, + struct xfs_getfsmap_info *info) +{ + struct xfs_btree_cur *bt_cur = NULL; + struct getfsmap *lowkey; + struct getfsmap *highkey; + xfs_fsblock_t start_fsb; + xfs_fsblock_t end_fsb; + xfs_agnumber_t start_ag; + xfs_agnumber_t end_ag; + xfs_daddr_t eofs; + int error = 0; + + lowkey = keys; + highkey = keys + 1; + eofs = XFS_FSB_TO_BB(mp, mp->m_sb.sb_dblocks); + if (lowkey->fmv_block >= eofs) + return 0; + if (highkey->fmv_block >= eofs) + highkey->fmv_block = eofs - 1; + start_fsb = XFS_DADDR_TO_FSB(mp, lowkey->fmv_block); + end_fsb = XFS_DADDR_TO_FSB(mp, highkey->fmv_block); + + /* Set up search keys */ + info->low.rm_startblock = XFS_FSB_TO_AGBNO(mp, start_fsb); + info->low.rm_offset = XFS_BB_TO_FSBT(mp, lowkey->fmv_offset); + info->low.rm_owner = lowkey->fmv_owner; + info->low.rm_blockcount = 0; + xfs_getfsmap_set_irec_flags(&info->low, lowkey); + + info->high.rm_startblock = -1U; + info->high.rm_owner = ULLONG_MAX; + info->high.rm_offset = ULLONG_MAX; + info->high.rm_blockcount = 0; + info->high.rm_flags = XFS_RMAP_KEY_FLAGS | XFS_RMAP_REC_FLAGS; + + start_ag = XFS_FSB_TO_AGNO(mp, start_fsb); + end_ag = XFS_FSB_TO_AGNO(mp, end_fsb); + + /* Query each AG */ + for (info->agno = start_ag; info->agno <= end_ag; info->agno++) { + if (info->agno == end_ag) { + info->high.rm_startblock = XFS_FSB_TO_AGBNO(mp, + end_fsb); + info->high.rm_offset = XFS_BB_TO_FSBT(mp, + highkey->fmv_offset); + info->high.rm_owner = highkey->fmv_owner; + xfs_getfsmap_set_irec_flags(&info->high, highkey); + } + + if (bt_cur) { + xfs_btree_del_cursor(bt_cur, XFS_BTREE_NOERROR); + xfs_trans_brelse(NULL, info->agbp); + bt_cur = NULL; + info->agbp = NULL; + } + + error = xfs_alloc_read_agf(mp, NULL, info->agno, 0, + &info->agbp); + if (error) + goto err; + + trace_xfs_fsmap_low_key(mp, info->agno, + info->low.rm_startblock, + info->low.rm_blockcount, + info->low.rm_owner, + info->low.rm_offset); + + trace_xfs_fsmap_high_key(mp, info->agno, + info->high.rm_startblock, + info->high.rm_blockcount, + info->high.rm_owner, + info->high.rm_offset); + + bt_cur = xfs_rmapbt_init_cursor(mp, NULL, info->agbp, + info->agno); + error = xfs_rmap_query_range(bt_cur, &info->low, &info->high, + xfs_getfsmap_datadev_helper, info); + if (error) + goto err; + + if (info->agno == start_ag) { + info->low.rm_startblock = 0; + info->low.rm_owner = 0; + info->low.rm_offset = 0; + info->low.rm_flags = 0; + } + } + + /* Report any free space at the end of the AG */ + info->last = true; + error = xfs_getfsmap_datadev_helper(bt_cur, &info->high, info); + if (error) + goto err; + +err: + if (bt_cur) + xfs_btree_del_cursor(bt_cur, error < 0 ? XFS_BTREE_ERROR : + XFS_BTREE_NOERROR); + if (info->agbp) { + xfs_trans_brelse(NULL, info->agbp); + info->agbp = NULL; + } + + return error; +} + +/* Do we recognize the device? */ +STATIC bool +xfs_getfsmap_is_valid_device( + struct xfs_mount *mp, + struct getfsmap *fmv) +{ + if (fmv->fmv_device == 0 || fmv->fmv_device == UINT_MAX || + fmv->fmv_device == new_encode_dev(mp->m_ddev_targp->bt_dev)) + return true; + if (mp->m_logdev_targp && + fmv->fmv_device == new_encode_dev(mp->m_logdev_targp->bt_dev)) + return true; + return false; +} + +#define XFS_GETFSMAP_DEVS 3 +/* + * Get filesystem's extents as described in fmv, and format for + * output. Calls formatter to fill the user's buffer until all + * extents are mapped, until the passed-in fmv->fmv_count slots have + * been filled, or until the formatter short-circuits the loop, if it + * is tracking filled-in extents on its own. + */ +int +xfs_getfsmap( + struct xfs_mount *mp, + struct getfsmap *fmv_low, + xfs_fsmap_format_t formatter, + void *arg) +{ + struct getfsmap *fmv_high; + struct getfsmap keys[2]; + struct xfs_getfsmap_dev handlers[XFS_GETFSMAP_DEVS]; + struct xfs_getfsmap_info info; + int i; + int error = 0; + + if (!xfs_sb_version_hasrmapbt(&mp->m_sb)) + return -EOPNOTSUPP; + if (fmv_low->fmv_count < 2) + return -EINVAL; + if (fmv_low->fmv_iflags & (~FMV_HIF_VALID)) + return -EINVAL; + fmv_high = fmv_low + 1; + if (!xfs_getfsmap_is_valid_device(mp, fmv_low) || + !xfs_getfsmap_is_valid_device(mp, fmv_high) || + fmv_high->fmv_iflags || fmv_high->fmv_count || + fmv_high->fmv_length || fmv_high->fmv_entries || + fmv_high->fmv_unused1 || fmv_low->fmv_unused1 || + fmv_high->fmv_unused2 || fmv_low->fmv_unused2) + return -EINVAL; + + fmv_low->fmv_entries = 0; + + /* Set up our device handlers. */ + memset(handlers, 0, sizeof(handlers)); + handlers[0].dev = new_encode_dev(mp->m_ddev_targp->bt_dev); + handlers[0].fn = xfs_getfsmap_datadev; + if (mp->m_logdev_targp != mp->m_ddev_targp) { + handlers[1].dev = new_encode_dev(mp->m_logdev_targp->bt_dev); + handlers[1].fn = xfs_getfsmap_logdev; + } + + xfs_sort(handlers, XFS_GETFSMAP_DEVS, sizeof(struct xfs_getfsmap_dev), + xfs_getfsmap_dev_compare); + + /* + * Since we allow the user to copy the last fmv item from a previous + * call into the low key slot, we have to advance the low key by + * whatever the reported length is. If the offset field doesn't apply, + * move up the start block to the next extent and start over with the + * lowest owner/offset possible; otherwise it's file data, so move up + * the offset only. + */ + keys[0] = *fmv_low; + if (keys[0].fmv_oflags & (FMV_OF_SPECIAL_OWNER | FMV_OF_EXTENT_MAP)) { + keys[0].fmv_block += fmv_low->fmv_length; + keys[0].fmv_owner = 0; + keys[0].fmv_offset = 0; + } else + keys[0].fmv_offset += fmv_low->fmv_length; + memset(keys + 1, 0xFF, sizeof(struct getfsmap)); + + info.fmv = fmv_low; + info.formatter = formatter; + info.format_arg = arg; + + /* For each device we support... */ + for (i = 0; i < XFS_GETFSMAP_DEVS; i++) { + /* Is this device within the range the user asked for? */ + if (!handlers[i].fn) + continue; + if (fmv_low->fmv_device > handlers[i].dev) + continue; + if (fmv_high->fmv_device < handlers[i].dev) + break; + + /* + * If this device number matches the high key, we have + * to pass the high key to the handler to limit the + * query results. If the device number exceeds the + * low key, zero out the low key so that we get + * everything from the beginning. + */ + if (handlers[i].dev == fmv_high->fmv_device) + keys[1] = *fmv_high; + if (handlers[i].dev > fmv_low->fmv_device) + memset(keys, 0, sizeof(struct getfsmap)); + + info.next_daddr = keys[0].fmv_block; + info.dev = handlers[i].dev; + info.last = false; + info.agno = NULLAGNUMBER; + error = handlers[i].fn(mp, keys, &info); + if (error) + break; + + } + + fmv_low->fmv_oflags = FMV_HOF_DEV_T; + return error; +} diff --git a/fs/xfs/xfs_fsops.h b/fs/xfs/xfs_fsops.h index f32713f..53ab2d7 100644 --- a/fs/xfs/xfs_fsops.h +++ b/fs/xfs/xfs_fsops.h @@ -26,4 +26,10 @@ extern int xfs_reserve_blocks(xfs_mount_t *mp, __uint64_t *inval, xfs_fsop_resblks_t *outval); extern int xfs_fs_goingdown(xfs_mount_t *mp, __uint32_t inflags); +/* fsmap to userspace formatter - copy to user & advance pointer */ +typedef int (*xfs_fsmap_format_t)(struct getfsmap *, void *); + +int xfs_getfsmap(struct xfs_mount *mp, struct getfsmap *fmv, + xfs_fsmap_format_t formatter, void *arg); + #endif /* __XFS_FSOPS_H__ */ diff --git a/fs/xfs/xfs_ioctl.c b/fs/xfs/xfs_ioctl.c index 9a7c878..ecdd77b 100644 --- a/fs/xfs/xfs_ioctl.c +++ b/fs/xfs/xfs_ioctl.c @@ -41,6 +41,7 @@ #include "xfs_trans.h" #include "xfs_pnfs.h" #include "xfs_acl.h" +#include "xfs_btree.h" #include #include @@ -1532,6 +1533,76 @@ xfs_ioc_getbmapx( return 0; } +struct getfsmap_info { + struct xfs_mount *mp; + struct getfsmap __user *data; + __s64 last_flags; +}; + +STATIC int +xfs_getfsmap_format(struct getfsmap *fmv, void *priv) +{ + struct getfsmap_info *info = priv; + + trace_xfs_getfsmap_mapping(info->mp, fmv->fmv_block, + fmv->fmv_length, fmv->fmv_owner, + fmv->fmv_offset, fmv->fmv_oflags); + + info->last_flags = fmv->fmv_oflags; + if (copy_to_user(info->data, fmv, sizeof(struct getfsmap))) + return -EFAULT; + + info->data++; + return 0; +} + +STATIC int +xfs_ioc_getfsmap( + struct xfs_inode *ip, + void __user *arg) +{ + struct getfsmap_info info; + struct getfsmap fmx[2]; + bool aborted = false; + int error; + + if (copy_from_user(&fmx, arg, 2 * sizeof(struct getfsmap))) + return -EFAULT; + + trace_xfs_getfsmap_low_key(ip->i_mount, fmx[0].fmv_block, + fmx[0].fmv_length, fmx[0].fmv_owner, + fmx[0].fmv_offset, fmx[0].fmv_oflags); + + trace_xfs_getfsmap_high_key(ip->i_mount, fmx[1].fmv_block, + fmx[1].fmv_length, fmx[1].fmv_owner, + fmx[1].fmv_offset, fmx[1].fmv_oflags); + + info.mp = ip->i_mount; + info.data = (__force struct getfsmap *)arg + 2; + error = xfs_getfsmap(ip->i_mount, fmx, xfs_getfsmap_format, &info); + if (error == XFS_BTREE_QUERY_RANGE_ABORT) { + error = 0; + aborted = true; + } + if (error) + return error; + + /* If we didn't abort, set the "last" flag in the last fmx */ + if (!aborted && fmx[0].fmv_entries) { + info.data--; + info.last_flags |= FMV_OF_LAST; + if (copy_to_user(&info.data->fmv_oflags, &info.last_flags, + sizeof(info.last_flags))) + return -EFAULT; + } + + /* copy back header */ + if (copy_to_user(arg, fmx, 2 * sizeof(struct getfsmap))) + return -EFAULT; + + return 0; +} + int xfs_ioc_swapext( xfs_swapext_t *sxp) @@ -1712,6 +1783,11 @@ xfs_file_ioctl( case XFS_IOC_GETBMAPX: return xfs_ioc_getbmapx(ip, arg); + case XFS_IOC_GETFSMAP: + if (!capable(CAP_SYS_ADMIN)) + return -EPERM; + return xfs_ioc_getfsmap(ip, arg); + case XFS_IOC_FD_TO_HANDLE: case XFS_IOC_PATH_TO_HANDLE: case XFS_IOC_PATH_TO_FSHANDLE: { diff --git a/fs/xfs/xfs_ioctl32.c b/fs/xfs/xfs_ioctl32.c index 321f577..9491bc8 100644 --- a/fs/xfs/xfs_ioctl32.c +++ b/fs/xfs/xfs_ioctl32.c @@ -554,6 +554,7 @@ xfs_file_compat_ioctl( case XFS_IOC_GOINGDOWN: case XFS_IOC_ERROR_INJECTION: case XFS_IOC_ERROR_CLEARALL: + case XFS_IOC_GETFSMAP: return xfs_file_ioctl(filp, cmd, p); #ifndef BROKEN_X86_ALIGNMENT /* These are handled fine if no alignment issues */ diff --git a/fs/xfs/xfs_trace.h b/fs/xfs/xfs_trace.h index 551b7e2..8a42609 100644 --- a/fs/xfs/xfs_trace.h +++ b/fs/xfs/xfs_trace.h @@ -2559,6 +2559,82 @@ DEFINE_RMAPBT_EVENT(xfs_rmap_lookup_le_range_result); DEFINE_RMAPBT_EVENT(xfs_rmap_find_right_neighbor_result); DEFINE_RMAPBT_EVENT(xfs_rmap_find_left_neighbor_result); +/* fsmap traces */ +DECLARE_EVENT_CLASS(xfs_fsmap_class, + TP_PROTO(struct xfs_mount *mp, xfs_agnumber_t agno, xfs_fsblock_t bno, + xfs_filblks_t len, __uint64_t owner, __uint64_t offset), + TP_ARGS(mp, agno, bno, len, owner, offset), + TP_STRUCT__entry( + __field(dev_t, dev) + __field(xfs_agnumber_t, agno) + __field(xfs_fsblock_t, bno) + __field(xfs_filblks_t, len) + __field(__uint64_t, owner) + __field(__uint64_t, offset) + ), + TP_fast_assign( + __entry->dev = mp->m_super->s_dev; + __entry->agno = agno; + __entry->bno = bno; + __entry->len = len; + __entry->owner = owner; + __entry->offset = offset; + ), + TP_printk("dev %d:%d agno %u bno %llu len %llu owner %lld offset 0x%llx\n", + MAJOR(__entry->dev), MINOR(__entry->dev), + __entry->agno, + __entry->bno, + __entry->len, + __entry->owner, + __entry->offset) +) +#define DEFINE_FSMAP_EVENT(name) \ +DEFINE_EVENT(xfs_fsmap_class, name, \ + TP_PROTO(struct xfs_mount *mp, xfs_agnumber_t agno, \ + xfs_fsblock_t bno, xfs_filblks_t len, __uint64_t owner, \ + __uint64_t offset), \ + TP_ARGS(mp, agno, bno, len, owner, offset)) +DEFINE_FSMAP_EVENT(xfs_fsmap_low_key); +DEFINE_FSMAP_EVENT(xfs_fsmap_high_key); +DEFINE_FSMAP_EVENT(xfs_fsmap_mapping); + +DECLARE_EVENT_CLASS(xfs_getfsmap_class, + TP_PROTO(struct xfs_mount *mp, xfs_daddr_t block, xfs_daddr_t len, + __uint64_t owner, __uint64_t offset, __uint64_t flags), + TP_ARGS(mp, block, len, owner, offset, flags), + TP_STRUCT__entry( + __field(dev_t, dev) + __field(xfs_daddr_t, block) + __field(xfs_daddr_t, len) + __field(__uint64_t, owner) + __field(__uint64_t, offset) + __field(__uint64_t, flags) + ), + TP_fast_assign( + __entry->dev = mp->m_super->s_dev; + __entry->block = block; + __entry->len = len; + __entry->owner = owner; + __entry->offset = offset; + __entry->flags = flags; + ), + TP_printk("dev %d:%d block %llu len %llu owner %lld offset %llu flags 0x%llx\n", + MAJOR(__entry->dev), MINOR(__entry->dev), + __entry->block, + __entry->len, + __entry->owner, + __entry->offset, + __entry->flags) +) +#define DEFINE_GETFSMAP_EVENT(name) \ +DEFINE_EVENT(xfs_getfsmap_class, name, \ + TP_PROTO(struct xfs_mount *mp, xfs_daddr_t block, xfs_daddr_t len, \ + __uint64_t owner, __uint64_t offset, __uint64_t flags), \ + TP_ARGS(mp, block, len, owner, offset, flags)) +DEFINE_GETFSMAP_EVENT(xfs_getfsmap_low_key); +DEFINE_GETFSMAP_EVENT(xfs_getfsmap_high_key); +DEFINE_GETFSMAP_EVENT(xfs_getfsmap_mapping); + #endif /* _TRACE_XFS_H */ #undef TRACE_INCLUDE_PATH