diff options
Diffstat (limited to '')
| -rw-r--r-- | fs/xfs/xfs_itable.c | 456 |
1 files changed, 456 insertions, 0 deletions
diff --git a/fs/xfs/xfs_itable.c b/fs/xfs/xfs_itable.c new file mode 100644 index 000000000..a1c2bcf65 --- /dev/null +++ b/fs/xfs/xfs_itable.c @@ -0,0 +1,456 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (c) 2000-2002,2005 Silicon Graphics, Inc. + * All Rights Reserved. + */ +#include "xfs.h" +#include "xfs_fs.h" +#include "xfs_shared.h" +#include "xfs_format.h" +#include "xfs_log_format.h" +#include "xfs_trans_resv.h" +#include "xfs_mount.h" +#include "xfs_inode.h" +#include "xfs_btree.h" +#include "xfs_ialloc.h" +#include "xfs_ialloc_btree.h" +#include "xfs_iwalk.h" +#include "xfs_itable.h" +#include "xfs_error.h" +#include "xfs_icache.h" +#include "xfs_health.h" +#include "xfs_trans.h" + +/* + * Bulk Stat + * ========= + * + * Use the inode walking functions to fill out struct xfs_bulkstat for every + * allocated inode, then pass the stat information to some externally provided + * iteration function. + */ + +struct xfs_bstat_chunk { + bulkstat_one_fmt_pf formatter; + struct xfs_ibulk *breq; + struct xfs_bulkstat *buf; +}; + +/* + * Fill out the bulkstat info for a single inode and report it somewhere. + * + * bc->breq->lastino is effectively the inode cursor as we walk through the + * filesystem. Therefore, we update it any time we need to move the cursor + * forward, regardless of whether or not we're sending any bstat information + * back to userspace. If the inode is internal metadata or, has been freed + * out from under us, we just simply keep going. + * + * However, if any other type of error happens we want to stop right where we + * are so that userspace will call back with exact number of the bad inode and + * we can send back an error code. + * + * Note that if the formatter tells us there's no space left in the buffer we + * move the cursor forward and abort the walk. + */ +STATIC int +xfs_bulkstat_one_int( + struct xfs_mount *mp, + struct user_namespace *mnt_userns, + struct xfs_trans *tp, + xfs_ino_t ino, + struct xfs_bstat_chunk *bc) +{ + struct user_namespace *sb_userns = mp->m_super->s_user_ns; + struct xfs_inode *ip; /* incore inode pointer */ + struct inode *inode; + struct xfs_bulkstat *buf = bc->buf; + xfs_extnum_t nextents; + int error = -EINVAL; + vfsuid_t vfsuid; + vfsgid_t vfsgid; + + if (xfs_internal_inum(mp, ino)) + goto out_advance; + + error = xfs_iget(mp, tp, ino, + (XFS_IGET_DONTCACHE | XFS_IGET_UNTRUSTED), + XFS_ILOCK_SHARED, &ip); + if (error == -ENOENT || error == -EINVAL) + goto out_advance; + if (error) + goto out; + + ASSERT(ip != NULL); + ASSERT(ip->i_imap.im_blkno != 0); + inode = VFS_I(ip); + vfsuid = i_uid_into_vfsuid(mnt_userns, inode); + vfsgid = i_gid_into_vfsgid(mnt_userns, inode); + + /* xfs_iget returns the following without needing + * further change. + */ + buf->bs_projectid = ip->i_projid; + buf->bs_ino = ino; + buf->bs_uid = from_kuid(sb_userns, vfsuid_into_kuid(vfsuid)); + buf->bs_gid = from_kgid(sb_userns, vfsgid_into_kgid(vfsgid)); + buf->bs_size = ip->i_disk_size; + + buf->bs_nlink = inode->i_nlink; + buf->bs_atime = inode->i_atime.tv_sec; + buf->bs_atime_nsec = inode->i_atime.tv_nsec; + buf->bs_mtime = inode->i_mtime.tv_sec; + buf->bs_mtime_nsec = inode->i_mtime.tv_nsec; + buf->bs_ctime = inode->i_ctime.tv_sec; + buf->bs_ctime_nsec = inode->i_ctime.tv_nsec; + buf->bs_gen = inode->i_generation; + buf->bs_mode = inode->i_mode; + + buf->bs_xflags = xfs_ip2xflags(ip); + buf->bs_extsize_blks = ip->i_extsize; + + nextents = xfs_ifork_nextents(&ip->i_df); + if (!(bc->breq->flags & XFS_IBULK_NREXT64)) + buf->bs_extents = min(nextents, XFS_MAX_EXTCNT_DATA_FORK_SMALL); + else + buf->bs_extents64 = nextents; + + xfs_bulkstat_health(ip, buf); + buf->bs_aextents = xfs_ifork_nextents(&ip->i_af); + buf->bs_forkoff = xfs_inode_fork_boff(ip); + buf->bs_version = XFS_BULKSTAT_VERSION_V5; + + if (xfs_has_v3inodes(mp)) { + buf->bs_btime = ip->i_crtime.tv_sec; + buf->bs_btime_nsec = ip->i_crtime.tv_nsec; + if (ip->i_diflags2 & XFS_DIFLAG2_COWEXTSIZE) + buf->bs_cowextsize_blks = ip->i_cowextsize; + } + + switch (ip->i_df.if_format) { + case XFS_DINODE_FMT_DEV: + buf->bs_rdev = sysv_encode_dev(inode->i_rdev); + buf->bs_blksize = BLKDEV_IOSIZE; + buf->bs_blocks = 0; + break; + case XFS_DINODE_FMT_LOCAL: + buf->bs_rdev = 0; + buf->bs_blksize = mp->m_sb.sb_blocksize; + buf->bs_blocks = 0; + break; + case XFS_DINODE_FMT_EXTENTS: + case XFS_DINODE_FMT_BTREE: + buf->bs_rdev = 0; + buf->bs_blksize = mp->m_sb.sb_blocksize; + buf->bs_blocks = ip->i_nblocks + ip->i_delayed_blks; + break; + } + xfs_iunlock(ip, XFS_ILOCK_SHARED); + xfs_irele(ip); + + error = bc->formatter(bc->breq, buf); + if (error == -ECANCELED) + goto out_advance; + if (error) + goto out; + +out_advance: + /* + * Advance the cursor to the inode that comes after the one we just + * looked at. We want the caller to move along if the bulkstat + * information was copied successfully; if we tried to grab the inode + * but it's no longer allocated; or if it's internal metadata. + */ + bc->breq->startino = ino + 1; +out: + return error; +} + +/* Bulkstat a single inode. */ +int +xfs_bulkstat_one( + struct xfs_ibulk *breq, + bulkstat_one_fmt_pf formatter) +{ + struct xfs_bstat_chunk bc = { + .formatter = formatter, + .breq = breq, + }; + struct xfs_trans *tp; + int error; + + if (breq->mnt_userns != &init_user_ns) { + xfs_warn_ratelimited(breq->mp, + "bulkstat not supported inside of idmapped mounts."); + return -EINVAL; + } + + ASSERT(breq->icount == 1); + + bc.buf = kmem_zalloc(sizeof(struct xfs_bulkstat), + KM_MAYFAIL); + if (!bc.buf) + return -ENOMEM; + + /* + * Grab an empty transaction so that we can use its recursive buffer + * locking abilities to detect cycles in the inobt without deadlocking. + */ + error = xfs_trans_alloc_empty(breq->mp, &tp); + if (error) + goto out; + + error = xfs_bulkstat_one_int(breq->mp, breq->mnt_userns, tp, + breq->startino, &bc); + xfs_trans_cancel(tp); +out: + kmem_free(bc.buf); + + /* + * If we reported one inode to userspace then we abort because we hit + * the end of the buffer. Don't leak that back to userspace. + */ + if (error == -ECANCELED) + error = 0; + + return error; +} + +static int +xfs_bulkstat_iwalk( + struct xfs_mount *mp, + struct xfs_trans *tp, + xfs_ino_t ino, + void *data) +{ + struct xfs_bstat_chunk *bc = data; + int error; + + error = xfs_bulkstat_one_int(mp, bc->breq->mnt_userns, tp, ino, data); + /* bulkstat just skips over missing inodes */ + if (error == -ENOENT || error == -EINVAL) + return 0; + return error; +} + +/* + * Check the incoming lastino parameter. + * + * We allow any inode value that could map to physical space inside the + * filesystem because if there are no inodes there, bulkstat moves on to the + * next chunk. In other words, the magic agino value of zero takes us to the + * first chunk in the AG, and an agino value past the end of the AG takes us to + * the first chunk in the next AG. + * + * Therefore we can end early if the requested inode is beyond the end of the + * filesystem or doesn't map properly. + */ +static inline bool +xfs_bulkstat_already_done( + struct xfs_mount *mp, + xfs_ino_t startino) +{ + xfs_agnumber_t agno = XFS_INO_TO_AGNO(mp, startino); + xfs_agino_t agino = XFS_INO_TO_AGINO(mp, startino); + + return agno >= mp->m_sb.sb_agcount || + startino != XFS_AGINO_TO_INO(mp, agno, agino); +} + +/* Return stat information in bulk (by-inode) for the filesystem. */ +int +xfs_bulkstat( + struct xfs_ibulk *breq, + bulkstat_one_fmt_pf formatter) +{ + struct xfs_bstat_chunk bc = { + .formatter = formatter, + .breq = breq, + }; + struct xfs_trans *tp; + unsigned int iwalk_flags = 0; + int error; + + if (breq->mnt_userns != &init_user_ns) { + xfs_warn_ratelimited(breq->mp, + "bulkstat not supported inside of idmapped mounts."); + return -EINVAL; + } + if (xfs_bulkstat_already_done(breq->mp, breq->startino)) + return 0; + + bc.buf = kmem_zalloc(sizeof(struct xfs_bulkstat), + KM_MAYFAIL); + if (!bc.buf) + return -ENOMEM; + + /* + * Grab an empty transaction so that we can use its recursive buffer + * locking abilities to detect cycles in the inobt without deadlocking. + */ + error = xfs_trans_alloc_empty(breq->mp, &tp); + if (error) + goto out; + + if (breq->flags & XFS_IBULK_SAME_AG) + iwalk_flags |= XFS_IWALK_SAME_AG; + + error = xfs_iwalk(breq->mp, tp, breq->startino, iwalk_flags, + xfs_bulkstat_iwalk, breq->icount, &bc); + xfs_trans_cancel(tp); +out: + kmem_free(bc.buf); + + /* + * We found some inodes, so clear the error status and return them. + * The lastino pointer will point directly at the inode that triggered + * any error that occurred, so on the next call the error will be + * triggered again and propagated to userspace as there will be no + * formatted inodes in the buffer. + */ + if (breq->ocount > 0) + error = 0; + + return error; +} + +/* Convert bulkstat (v5) to bstat (v1). */ +void +xfs_bulkstat_to_bstat( + struct xfs_mount *mp, + struct xfs_bstat *bs1, + const struct xfs_bulkstat *bstat) +{ + /* memset is needed here because of padding holes in the structure. */ + memset(bs1, 0, sizeof(struct xfs_bstat)); + bs1->bs_ino = bstat->bs_ino; + bs1->bs_mode = bstat->bs_mode; + bs1->bs_nlink = bstat->bs_nlink; + bs1->bs_uid = bstat->bs_uid; + bs1->bs_gid = bstat->bs_gid; + bs1->bs_rdev = bstat->bs_rdev; + bs1->bs_blksize = bstat->bs_blksize; + bs1->bs_size = bstat->bs_size; + bs1->bs_atime.tv_sec = bstat->bs_atime; + bs1->bs_mtime.tv_sec = bstat->bs_mtime; + bs1->bs_ctime.tv_sec = bstat->bs_ctime; + bs1->bs_atime.tv_nsec = bstat->bs_atime_nsec; + bs1->bs_mtime.tv_nsec = bstat->bs_mtime_nsec; + bs1->bs_ctime.tv_nsec = bstat->bs_ctime_nsec; + bs1->bs_blocks = bstat->bs_blocks; + bs1->bs_xflags = bstat->bs_xflags; + bs1->bs_extsize = XFS_FSB_TO_B(mp, bstat->bs_extsize_blks); + bs1->bs_extents = bstat->bs_extents; + bs1->bs_gen = bstat->bs_gen; + bs1->bs_projid_lo = bstat->bs_projectid & 0xFFFF; + bs1->bs_forkoff = bstat->bs_forkoff; + bs1->bs_projid_hi = bstat->bs_projectid >> 16; + bs1->bs_sick = bstat->bs_sick; + bs1->bs_checked = bstat->bs_checked; + bs1->bs_cowextsize = XFS_FSB_TO_B(mp, bstat->bs_cowextsize_blks); + bs1->bs_dmevmask = 0; + bs1->bs_dmstate = 0; + bs1->bs_aextents = bstat->bs_aextents; +} + +struct xfs_inumbers_chunk { + inumbers_fmt_pf formatter; + struct xfs_ibulk *breq; +}; + +/* + * INUMBERS + * ======== + * This is how we export inode btree records to userspace, so that XFS tools + * can figure out where inodes are allocated. + */ + +/* + * Format the inode group structure and report it somewhere. + * + * Similar to xfs_bulkstat_one_int, lastino is the inode cursor as we walk + * through the filesystem so we move it forward unless there was a runtime + * error. If the formatter tells us the buffer is now full we also move the + * cursor forward and abort the walk. + */ +STATIC int +xfs_inumbers_walk( + struct xfs_mount *mp, + struct xfs_trans *tp, + xfs_agnumber_t agno, + const struct xfs_inobt_rec_incore *irec, + void *data) +{ + struct xfs_inumbers inogrp = { + .xi_startino = XFS_AGINO_TO_INO(mp, agno, irec->ir_startino), + .xi_alloccount = irec->ir_count - irec->ir_freecount, + .xi_allocmask = ~irec->ir_free, + .xi_version = XFS_INUMBERS_VERSION_V5, + }; + struct xfs_inumbers_chunk *ic = data; + int error; + + error = ic->formatter(ic->breq, &inogrp); + if (error && error != -ECANCELED) + return error; + + ic->breq->startino = XFS_AGINO_TO_INO(mp, agno, irec->ir_startino) + + XFS_INODES_PER_CHUNK; + return error; +} + +/* + * Return inode number table for the filesystem. + */ +int +xfs_inumbers( + struct xfs_ibulk *breq, + inumbers_fmt_pf formatter) +{ + struct xfs_inumbers_chunk ic = { + .formatter = formatter, + .breq = breq, + }; + struct xfs_trans *tp; + int error = 0; + + if (xfs_bulkstat_already_done(breq->mp, breq->startino)) + return 0; + + /* + * Grab an empty transaction so that we can use its recursive buffer + * locking abilities to detect cycles in the inobt without deadlocking. + */ + error = xfs_trans_alloc_empty(breq->mp, &tp); + if (error) + goto out; + + error = xfs_inobt_walk(breq->mp, tp, breq->startino, breq->flags, + xfs_inumbers_walk, breq->icount, &ic); + xfs_trans_cancel(tp); +out: + + /* + * We found some inode groups, so clear the error status and return + * them. The lastino pointer will point directly at the inode that + * triggered any error that occurred, so on the next call the error + * will be triggered again and propagated to userspace as there will be + * no formatted inode groups in the buffer. + */ + if (breq->ocount > 0) + error = 0; + + return error; +} + +/* Convert an inumbers (v5) struct to a inogrp (v1) struct. */ +void +xfs_inumbers_to_inogrp( + struct xfs_inogrp *ig1, + const struct xfs_inumbers *ig) +{ + /* memset is needed here because of padding holes in the structure. */ + memset(ig1, 0, sizeof(struct xfs_inogrp)); + ig1->xi_startino = ig->xi_startino; + ig1->xi_alloccount = ig->xi_alloccount; + ig1->xi_allocmask = ig->xi_allocmask; +} |