v4.19.13 snapshot.
diff --git a/fs/xfs/xfs_itable.c b/fs/xfs/xfs_itable.c
new file mode 100644
index 0000000..e9508ba
--- /dev/null
+++ b/fs/xfs/xfs_itable.c
@@ -0,0 +1,639 @@
+// 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_itable.h"
+#include "xfs_error.h"
+#include "xfs_trace.h"
+#include "xfs_icache.h"
+
+/*
+ * Return stat information for one inode.
+ * Return 0 if ok, else errno.
+ */
+int
+xfs_bulkstat_one_int(
+ struct xfs_mount *mp, /* mount point for filesystem */
+ xfs_ino_t ino, /* inode to get data for */
+ void __user *buffer, /* buffer to place output in */
+ int ubsize, /* size of buffer */
+ bulkstat_one_fmt_pf formatter, /* formatter, copy to user */
+ int *ubused, /* bytes used by me */
+ int *stat) /* BULKSTAT_RV_... */
+{
+ struct xfs_icdinode *dic; /* dinode core info pointer */
+ struct xfs_inode *ip; /* incore inode pointer */
+ struct inode *inode;
+ struct xfs_bstat *buf; /* return buffer */
+ int error = 0; /* error value */
+
+ *stat = BULKSTAT_RV_NOTHING;
+
+ if (!buffer || xfs_internal_inum(mp, ino))
+ return -EINVAL;
+
+ buf = kmem_zalloc(sizeof(*buf), KM_SLEEP | KM_MAYFAIL);
+ if (!buf)
+ return -ENOMEM;
+
+ error = xfs_iget(mp, NULL, ino,
+ (XFS_IGET_DONTCACHE | XFS_IGET_UNTRUSTED),
+ XFS_ILOCK_SHARED, &ip);
+ if (error)
+ goto out_free;
+
+ ASSERT(ip != NULL);
+ ASSERT(ip->i_imap.im_blkno != 0);
+ inode = VFS_I(ip);
+
+ dic = &ip->i_d;
+
+ /* xfs_iget returns the following without needing
+ * further change.
+ */
+ buf->bs_projid_lo = dic->di_projid_lo;
+ buf->bs_projid_hi = dic->di_projid_hi;
+ buf->bs_ino = ino;
+ buf->bs_uid = dic->di_uid;
+ buf->bs_gid = dic->di_gid;
+ buf->bs_size = dic->di_size;
+
+ buf->bs_nlink = inode->i_nlink;
+ buf->bs_atime.tv_sec = inode->i_atime.tv_sec;
+ buf->bs_atime.tv_nsec = inode->i_atime.tv_nsec;
+ buf->bs_mtime.tv_sec = inode->i_mtime.tv_sec;
+ buf->bs_mtime.tv_nsec = inode->i_mtime.tv_nsec;
+ buf->bs_ctime.tv_sec = inode->i_ctime.tv_sec;
+ buf->bs_ctime.tv_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 = dic->di_extsize << mp->m_sb.sb_blocklog;
+ buf->bs_extents = dic->di_nextents;
+ memset(buf->bs_pad, 0, sizeof(buf->bs_pad));
+ buf->bs_dmevmask = dic->di_dmevmask;
+ buf->bs_dmstate = dic->di_dmstate;
+ buf->bs_aextents = dic->di_anextents;
+ buf->bs_forkoff = XFS_IFORK_BOFF(ip);
+
+ if (dic->di_version == 3) {
+ if (dic->di_flags2 & XFS_DIFLAG2_COWEXTSIZE)
+ buf->bs_cowextsize = dic->di_cowextsize <<
+ mp->m_sb.sb_blocklog;
+ }
+
+ switch (dic->di_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 = dic->di_nblocks + ip->i_delayed_blks;
+ break;
+ }
+ xfs_iunlock(ip, XFS_ILOCK_SHARED);
+ xfs_irele(ip);
+
+ error = formatter(buffer, ubsize, ubused, buf);
+ if (!error)
+ *stat = BULKSTAT_RV_DIDONE;
+
+ out_free:
+ kmem_free(buf);
+ return error;
+}
+
+/* Return 0 on success or positive error */
+STATIC int
+xfs_bulkstat_one_fmt(
+ void __user *ubuffer,
+ int ubsize,
+ int *ubused,
+ const xfs_bstat_t *buffer)
+{
+ if (ubsize < sizeof(*buffer))
+ return -ENOMEM;
+ if (copy_to_user(ubuffer, buffer, sizeof(*buffer)))
+ return -EFAULT;
+ if (ubused)
+ *ubused = sizeof(*buffer);
+ return 0;
+}
+
+int
+xfs_bulkstat_one(
+ xfs_mount_t *mp, /* mount point for filesystem */
+ xfs_ino_t ino, /* inode number to get data for */
+ void __user *buffer, /* buffer to place output in */
+ int ubsize, /* size of buffer */
+ int *ubused, /* bytes used by me */
+ int *stat) /* BULKSTAT_RV_... */
+{
+ return xfs_bulkstat_one_int(mp, ino, buffer, ubsize,
+ xfs_bulkstat_one_fmt, ubused, stat);
+}
+
+/*
+ * Loop over all clusters in a chunk for a given incore inode allocation btree
+ * record. Do a readahead if there are any allocated inodes in that cluster.
+ */
+STATIC void
+xfs_bulkstat_ichunk_ra(
+ struct xfs_mount *mp,
+ xfs_agnumber_t agno,
+ struct xfs_inobt_rec_incore *irec)
+{
+ xfs_agblock_t agbno;
+ struct blk_plug plug;
+ int blks_per_cluster;
+ int inodes_per_cluster;
+ int i; /* inode chunk index */
+
+ agbno = XFS_AGINO_TO_AGBNO(mp, irec->ir_startino);
+ blks_per_cluster = xfs_icluster_size_fsb(mp);
+ inodes_per_cluster = blks_per_cluster << mp->m_sb.sb_inopblog;
+
+ blk_start_plug(&plug);
+ for (i = 0; i < XFS_INODES_PER_CHUNK;
+ i += inodes_per_cluster, agbno += blks_per_cluster) {
+ if (xfs_inobt_maskn(i, inodes_per_cluster) & ~irec->ir_free) {
+ xfs_btree_reada_bufs(mp, agno, agbno, blks_per_cluster,
+ &xfs_inode_buf_ops);
+ }
+ }
+ blk_finish_plug(&plug);
+}
+
+/*
+ * Lookup the inode chunk that the given inode lives in and then get the record
+ * if we found the chunk. If the inode was not the last in the chunk and there
+ * are some left allocated, update the data for the pointed-to record as well as
+ * return the count of grabbed inodes.
+ */
+STATIC int
+xfs_bulkstat_grab_ichunk(
+ struct xfs_btree_cur *cur, /* btree cursor */
+ xfs_agino_t agino, /* starting inode of chunk */
+ int *icount,/* return # of inodes grabbed */
+ struct xfs_inobt_rec_incore *irec) /* btree record */
+{
+ int idx; /* index into inode chunk */
+ int stat;
+ int error = 0;
+
+ /* Lookup the inode chunk that this inode lives in */
+ error = xfs_inobt_lookup(cur, agino, XFS_LOOKUP_LE, &stat);
+ if (error)
+ return error;
+ if (!stat) {
+ *icount = 0;
+ return error;
+ }
+
+ /* Get the record, should always work */
+ error = xfs_inobt_get_rec(cur, irec, &stat);
+ if (error)
+ return error;
+ XFS_WANT_CORRUPTED_RETURN(cur->bc_mp, stat == 1);
+
+ /* Check if the record contains the inode in request */
+ if (irec->ir_startino + XFS_INODES_PER_CHUNK <= agino) {
+ *icount = 0;
+ return 0;
+ }
+
+ idx = agino - irec->ir_startino + 1;
+ if (idx < XFS_INODES_PER_CHUNK &&
+ (xfs_inobt_maskn(idx, XFS_INODES_PER_CHUNK - idx) & ~irec->ir_free)) {
+ int i;
+
+ /* We got a right chunk with some left inodes allocated at it.
+ * Grab the chunk record. Mark all the uninteresting inodes
+ * free -- because they're before our start point.
+ */
+ for (i = 0; i < idx; i++) {
+ if (XFS_INOBT_MASK(i) & ~irec->ir_free)
+ irec->ir_freecount++;
+ }
+
+ irec->ir_free |= xfs_inobt_maskn(0, idx);
+ *icount = irec->ir_count - irec->ir_freecount;
+ }
+
+ return 0;
+}
+
+#define XFS_BULKSTAT_UBLEFT(ubleft) ((ubleft) >= statstruct_size)
+
+struct xfs_bulkstat_agichunk {
+ char __user **ac_ubuffer;/* pointer into user's buffer */
+ int ac_ubleft; /* bytes left in user's buffer */
+ int ac_ubelem; /* spaces used in user's buffer */
+};
+
+/*
+ * Process inodes in chunk with a pointer to a formatter function
+ * that will iget the inode and fill in the appropriate structure.
+ */
+static int
+xfs_bulkstat_ag_ichunk(
+ struct xfs_mount *mp,
+ xfs_agnumber_t agno,
+ struct xfs_inobt_rec_incore *irbp,
+ bulkstat_one_pf formatter,
+ size_t statstruct_size,
+ struct xfs_bulkstat_agichunk *acp,
+ xfs_agino_t *last_agino)
+{
+ char __user **ubufp = acp->ac_ubuffer;
+ int chunkidx;
+ int error = 0;
+ xfs_agino_t agino = irbp->ir_startino;
+
+ for (chunkidx = 0; chunkidx < XFS_INODES_PER_CHUNK;
+ chunkidx++, agino++) {
+ int fmterror;
+ int ubused;
+
+ /* inode won't fit in buffer, we are done */
+ if (acp->ac_ubleft < statstruct_size)
+ break;
+
+ /* Skip if this inode is free */
+ if (XFS_INOBT_MASK(chunkidx) & irbp->ir_free)
+ continue;
+
+ /* Get the inode and fill in a single buffer */
+ ubused = statstruct_size;
+ error = formatter(mp, XFS_AGINO_TO_INO(mp, agno, agino),
+ *ubufp, acp->ac_ubleft, &ubused, &fmterror);
+
+ if (fmterror == BULKSTAT_RV_GIVEUP ||
+ (error && error != -ENOENT && error != -EINVAL)) {
+ acp->ac_ubleft = 0;
+ ASSERT(error);
+ break;
+ }
+
+ /* be careful not to leak error if at end of chunk */
+ if (fmterror == BULKSTAT_RV_NOTHING || error) {
+ error = 0;
+ continue;
+ }
+
+ *ubufp += ubused;
+ acp->ac_ubleft -= ubused;
+ acp->ac_ubelem++;
+ }
+
+ /*
+ * Post-update *last_agino. At this point, agino will always point one
+ * inode past the last inode we processed successfully. Hence we
+ * substract that inode when setting the *last_agino cursor so that we
+ * return the correct cookie to userspace. On the next bulkstat call,
+ * the inode under the lastino cookie will be skipped as we have already
+ * processed it here.
+ */
+ *last_agino = agino - 1;
+
+ return error;
+}
+
+/*
+ * Return stat information in bulk (by-inode) for the filesystem.
+ */
+int /* error status */
+xfs_bulkstat(
+ xfs_mount_t *mp, /* mount point for filesystem */
+ xfs_ino_t *lastinop, /* last inode returned */
+ int *ubcountp, /* size of buffer/count returned */
+ bulkstat_one_pf formatter, /* func that'd fill a single buf */
+ size_t statstruct_size, /* sizeof struct filling */
+ char __user *ubuffer, /* buffer with inode stats */
+ int *done) /* 1 if there are more stats to get */
+{
+ xfs_buf_t *agbp; /* agi header buffer */
+ xfs_agino_t agino; /* inode # in allocation group */
+ xfs_agnumber_t agno; /* allocation group number */
+ xfs_btree_cur_t *cur; /* btree cursor for ialloc btree */
+ xfs_inobt_rec_incore_t *irbuf; /* start of irec buffer */
+ int nirbuf; /* size of irbuf */
+ int ubcount; /* size of user's buffer */
+ struct xfs_bulkstat_agichunk ac;
+ int error = 0;
+
+ /*
+ * Get the last inode value, see if there's nothing to do.
+ */
+ agno = XFS_INO_TO_AGNO(mp, *lastinop);
+ agino = XFS_INO_TO_AGINO(mp, *lastinop);
+ if (agno >= mp->m_sb.sb_agcount ||
+ *lastinop != XFS_AGINO_TO_INO(mp, agno, agino)) {
+ *done = 1;
+ *ubcountp = 0;
+ return 0;
+ }
+
+ ubcount = *ubcountp; /* statstruct's */
+ ac.ac_ubuffer = &ubuffer;
+ ac.ac_ubleft = ubcount * statstruct_size; /* bytes */;
+ ac.ac_ubelem = 0;
+
+ *ubcountp = 0;
+ *done = 0;
+
+ irbuf = kmem_zalloc_large(PAGE_SIZE * 4, KM_SLEEP);
+ if (!irbuf)
+ return -ENOMEM;
+ nirbuf = (PAGE_SIZE * 4) / sizeof(*irbuf);
+
+ /*
+ * Loop over the allocation groups, starting from the last
+ * inode returned; 0 means start of the allocation group.
+ */
+ while (agno < mp->m_sb.sb_agcount) {
+ struct xfs_inobt_rec_incore *irbp = irbuf;
+ struct xfs_inobt_rec_incore *irbufend = irbuf + nirbuf;
+ bool end_of_ag = false;
+ int icount = 0;
+ int stat;
+
+ error = xfs_ialloc_read_agi(mp, NULL, agno, &agbp);
+ if (error)
+ break;
+ /*
+ * Allocate and initialize a btree cursor for ialloc btree.
+ */
+ cur = xfs_inobt_init_cursor(mp, NULL, agbp, agno,
+ XFS_BTNUM_INO);
+ if (agino > 0) {
+ /*
+ * In the middle of an allocation group, we need to get
+ * the remainder of the chunk we're in.
+ */
+ struct xfs_inobt_rec_incore r;
+
+ error = xfs_bulkstat_grab_ichunk(cur, agino, &icount, &r);
+ if (error)
+ goto del_cursor;
+ if (icount) {
+ irbp->ir_startino = r.ir_startino;
+ irbp->ir_holemask = r.ir_holemask;
+ irbp->ir_count = r.ir_count;
+ irbp->ir_freecount = r.ir_freecount;
+ irbp->ir_free = r.ir_free;
+ irbp++;
+ }
+ /* Increment to the next record */
+ error = xfs_btree_increment(cur, 0, &stat);
+ } else {
+ /* Start of ag. Lookup the first inode chunk */
+ error = xfs_inobt_lookup(cur, 0, XFS_LOOKUP_GE, &stat);
+ }
+ if (error || stat == 0) {
+ end_of_ag = true;
+ goto del_cursor;
+ }
+
+ /*
+ * Loop through inode btree records in this ag,
+ * until we run out of inodes or space in the buffer.
+ */
+ while (irbp < irbufend && icount < ubcount) {
+ struct xfs_inobt_rec_incore r;
+
+ error = xfs_inobt_get_rec(cur, &r, &stat);
+ if (error || stat == 0) {
+ end_of_ag = true;
+ goto del_cursor;
+ }
+
+ /*
+ * If this chunk has any allocated inodes, save it.
+ * Also start read-ahead now for this chunk.
+ */
+ if (r.ir_freecount < r.ir_count) {
+ xfs_bulkstat_ichunk_ra(mp, agno, &r);
+ irbp->ir_startino = r.ir_startino;
+ irbp->ir_holemask = r.ir_holemask;
+ irbp->ir_count = r.ir_count;
+ irbp->ir_freecount = r.ir_freecount;
+ irbp->ir_free = r.ir_free;
+ irbp++;
+ icount += r.ir_count - r.ir_freecount;
+ }
+ error = xfs_btree_increment(cur, 0, &stat);
+ if (error || stat == 0) {
+ end_of_ag = true;
+ goto del_cursor;
+ }
+ cond_resched();
+ }
+
+ /*
+ * Drop the btree buffers and the agi buffer as we can't hold any
+ * of the locks these represent when calling iget. If there is a
+ * pending error, then we are done.
+ */
+del_cursor:
+ xfs_btree_del_cursor(cur, error);
+ xfs_buf_relse(agbp);
+ if (error)
+ break;
+ /*
+ * Now format all the good inodes into the user's buffer. The
+ * call to xfs_bulkstat_ag_ichunk() sets up the agino pointer
+ * for the next loop iteration.
+ */
+ irbufend = irbp;
+ for (irbp = irbuf;
+ irbp < irbufend && ac.ac_ubleft >= statstruct_size;
+ irbp++) {
+ error = xfs_bulkstat_ag_ichunk(mp, agno, irbp,
+ formatter, statstruct_size, &ac,
+ &agino);
+ if (error)
+ break;
+
+ cond_resched();
+ }
+
+ /*
+ * If we've run out of space or had a formatting error, we
+ * are now done
+ */
+ if (ac.ac_ubleft < statstruct_size || error)
+ break;
+
+ if (end_of_ag) {
+ agno++;
+ agino = 0;
+ }
+ }
+ /*
+ * Done, we're either out of filesystem or space to put the data.
+ */
+ kmem_free(irbuf);
+ *ubcountp = ac.ac_ubelem;
+
+ /*
+ * 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 (ac.ac_ubelem)
+ error = 0;
+
+ /*
+ * If we ran out of filesystem, lastino will point off the end of
+ * the filesystem so the next call will return immediately.
+ */
+ *lastinop = XFS_AGINO_TO_INO(mp, agno, agino);
+ if (agno >= mp->m_sb.sb_agcount)
+ *done = 1;
+
+ return error;
+}
+
+int
+xfs_inumbers_fmt(
+ void __user *ubuffer, /* buffer to write to */
+ const struct xfs_inogrp *buffer, /* buffer to read from */
+ long count, /* # of elements to read */
+ long *written) /* # of bytes written */
+{
+ if (copy_to_user(ubuffer, buffer, count * sizeof(*buffer)))
+ return -EFAULT;
+ *written = count * sizeof(*buffer);
+ return 0;
+}
+
+/*
+ * Return inode number table for the filesystem.
+ */
+int /* error status */
+xfs_inumbers(
+ struct xfs_mount *mp,/* mount point for filesystem */
+ xfs_ino_t *lastino,/* last inode returned */
+ int *count,/* size of buffer/count returned */
+ void __user *ubuffer,/* buffer with inode descriptions */
+ inumbers_fmt_pf formatter)
+{
+ xfs_agnumber_t agno = XFS_INO_TO_AGNO(mp, *lastino);
+ xfs_agino_t agino = XFS_INO_TO_AGINO(mp, *lastino);
+ struct xfs_btree_cur *cur = NULL;
+ struct xfs_buf *agbp = NULL;
+ struct xfs_inogrp *buffer;
+ int bcount;
+ int left = *count;
+ int bufidx = 0;
+ int error = 0;
+
+ *count = 0;
+ if (agno >= mp->m_sb.sb_agcount ||
+ *lastino != XFS_AGINO_TO_INO(mp, agno, agino))
+ return error;
+
+ bcount = min(left, (int)(PAGE_SIZE / sizeof(*buffer)));
+ buffer = kmem_zalloc(bcount * sizeof(*buffer), KM_SLEEP);
+ do {
+ struct xfs_inobt_rec_incore r;
+ int stat;
+
+ if (!agbp) {
+ error = xfs_ialloc_read_agi(mp, NULL, agno, &agbp);
+ if (error)
+ break;
+
+ cur = xfs_inobt_init_cursor(mp, NULL, agbp, agno,
+ XFS_BTNUM_INO);
+ error = xfs_inobt_lookup(cur, agino, XFS_LOOKUP_GE,
+ &stat);
+ if (error)
+ break;
+ if (!stat)
+ goto next_ag;
+ }
+
+ error = xfs_inobt_get_rec(cur, &r, &stat);
+ if (error)
+ break;
+ if (!stat)
+ goto next_ag;
+
+ agino = r.ir_startino + XFS_INODES_PER_CHUNK - 1;
+ buffer[bufidx].xi_startino =
+ XFS_AGINO_TO_INO(mp, agno, r.ir_startino);
+ buffer[bufidx].xi_alloccount = r.ir_count - r.ir_freecount;
+ buffer[bufidx].xi_allocmask = ~r.ir_free;
+ if (++bufidx == bcount) {
+ long written;
+
+ error = formatter(ubuffer, buffer, bufidx, &written);
+ if (error)
+ break;
+ ubuffer += written;
+ *count += bufidx;
+ bufidx = 0;
+ }
+ if (!--left)
+ break;
+
+ error = xfs_btree_increment(cur, 0, &stat);
+ if (error)
+ break;
+ if (stat)
+ continue;
+
+next_ag:
+ xfs_btree_del_cursor(cur, XFS_BTREE_ERROR);
+ cur = NULL;
+ xfs_buf_relse(agbp);
+ agbp = NULL;
+ agino = 0;
+ agno++;
+ } while (agno < mp->m_sb.sb_agcount);
+
+ if (!error) {
+ if (bufidx) {
+ long written;
+
+ error = formatter(ubuffer, buffer, bufidx, &written);
+ if (!error)
+ *count += bufidx;
+ }
+ *lastino = XFS_AGINO_TO_INO(mp, agno, agino);
+ }
+
+ kmem_free(buffer);
+ if (cur)
+ xfs_btree_del_cursor(cur, error);
+ if (agbp)
+ xfs_buf_relse(agbp);
+
+ return error;
+}