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Merge branch 'fallocate-insert-range' into for-next

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This commit is contained in:
Dave Chinner
2015-03-25 15:12:53 +11:00
parent 2b93681f59 a904b1ca57
commit a448f8f1b7
9 changed files with 497 additions and 92 deletions
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370
fs/xfs/libxfs/xfs_bmap.c
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@@ -5486,52 +5486,92 @@ xfs_bmse_shift_one(
int *current_ext,
struct xfs_bmbt_rec_host *gotp,
struct xfs_btree_cur *cur,
int *logflags)
int *logflags,
enum shift_direction direction)
{
struct xfs_ifork *ifp;
struct xfs_mount *mp;
xfs_fileoff_t startoff;
struct xfs_bmbt_rec_host *leftp;
struct xfs_bmbt_rec_host *adj_irecp;
struct xfs_bmbt_irec got;
struct xfs_bmbt_irec left;
struct xfs_bmbt_irec adj_irec;
int error;
int i;
int total_extents;
mp = ip->i_mount;
ifp = XFS_IFORK_PTR(ip, whichfork);
total_extents = ifp->if_bytes / sizeof(xfs_bmbt_rec_t);
xfs_bmbt_get_all(gotp, &got);
startoff = got.br_startoff - offset_shift_fsb;
/* delalloc extents should be prevented by caller */
XFS_WANT_CORRUPTED_RETURN(mp, !isnullstartblock(got.br_startblock));
/*
* Check for merge if we've got an extent to the left, otherwise make
* sure there's enough room at the start of the file for the shift.
*/
if (*current_ext) {
/* grab the left extent and check for a large enough hole */
leftp = xfs_iext_get_ext(ifp, *current_ext - 1);
xfs_bmbt_get_all(leftp, &left);
if (direction == SHIFT_LEFT) {
startoff = got.br_startoff - offset_shift_fsb;
if (startoff < left.br_startoff + left.br_blockcount)
/*
* Check for merge if we've got an extent to the left,
* otherwise make sure there's enough room at the start
* of the file for the shift.
*/
if (!*current_ext) {
if (got.br_startoff < offset_shift_fsb)
return -EINVAL;
goto update_current_ext;
}
/*
* grab the left extent and check for a large
* enough hole.
*/
adj_irecp = xfs_iext_get_ext(ifp, *current_ext - 1);
xfs_bmbt_get_all(adj_irecp, &adj_irec);
if (startoff <
adj_irec.br_startoff + adj_irec.br_blockcount)
return -EINVAL;
/* check whether to merge the extent or shift it down */
if (xfs_bmse_can_merge(&left, &got, offset_shift_fsb)) {
if (xfs_bmse_can_merge(&adj_irec, &got,
offset_shift_fsb)) {
return xfs_bmse_merge(ip, whichfork, offset_shift_fsb,
*current_ext, gotp, leftp, cur,
logflags);
*current_ext, gotp, adj_irecp,
cur, logflags);
}
} else if (got.br_startoff < offset_shift_fsb)
return -EINVAL;
} else {
startoff = got.br_startoff + offset_shift_fsb;
/* nothing to move if this is the last extent */
if (*current_ext >= (total_extents - 1))
goto update_current_ext;
/*
* If this is not the last extent in the file, make sure there
* is enough room between current extent and next extent for
* accommodating the shift.
*/
adj_irecp = xfs_iext_get_ext(ifp, *current_ext + 1);
xfs_bmbt_get_all(adj_irecp, &adj_irec);
if (startoff + got.br_blockcount > adj_irec.br_startoff)
return -EINVAL;
/*
* Unlike a left shift (which involves a hole punch),
* a right shift does not modify extent neighbors
* in any way. We should never find mergeable extents
* in this scenario. Check anyways and warn if we
* encounter two extents that could be one.
*/
if (xfs_bmse_can_merge(&got, &adj_irec, offset_shift_fsb))
WARN_ON_ONCE(1);
}
/*
* Increment the extent index for the next iteration, update the start
* offset of the in-core extent and update the btree if applicable.
*/
(*current_ext)++;
update_current_ext:
if (direction == SHIFT_LEFT)
(*current_ext)++;
else
(*current_ext)--;
xfs_bmbt_set_startoff(gotp, startoff);
*logflags |= XFS_ILOG_CORE;
if (!cur) {
@@ -5547,14 +5587,14 @@ xfs_bmse_shift_one(
got.br_startoff = startoff;
return xfs_bmbt_update(cur, got.br_startoff, got.br_startblock,
got.br_blockcount, got.br_state);
got.br_blockcount, got.br_state);
}
/*
* Shift extent records to the left to cover a hole.
* Shift extent records to the left/right to cover/create a hole.
*
* The maximum number of extents to be shifted in a single operation is
* @num_exts. @start_fsb specifies the file offset to start the shift and the
* @num_exts. @stop_fsb specifies the file offset at which to stop shift and the
* file offset where we've left off is returned in @next_fsb. @offset_shift_fsb
* is the length by which each extent is shifted. If there is no hole to shift
* the extents into, this will be considered invalid operation and we abort
@@ -5564,12 +5604,13 @@ int
xfs_bmap_shift_extents(
struct xfs_trans *tp,
struct xfs_inode *ip,
xfs_fileoff_t start_fsb,
xfs_fileoff_t *next_fsb,
xfs_fileoff_t offset_shift_fsb,
int *done,
xfs_fileoff_t *next_fsb,
xfs_fileoff_t stop_fsb,
xfs_fsblock_t *firstblock,
struct xfs_bmap_free *flist,
enum shift_direction direction,
int num_exts)
{
struct xfs_btree_cur *cur = NULL;
@@ -5579,10 +5620,11 @@ xfs_bmap_shift_extents(
struct xfs_ifork *ifp;
xfs_extnum_t nexts = 0;
xfs_extnum_t current_ext;
xfs_extnum_t total_extents;
xfs_extnum_t stop_extent;
int error = 0;
int whichfork = XFS_DATA_FORK;
int logflags = 0;
int total_extents;
if (unlikely(XFS_TEST_ERROR(
(XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS &&
@@ -5598,6 +5640,8 @@ xfs_bmap_shift_extents(
ASSERT(xfs_isilocked(ip, XFS_IOLOCK_EXCL));
ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
ASSERT(direction == SHIFT_LEFT || direction == SHIFT_RIGHT);
ASSERT(*next_fsb != NULLFSBLOCK || direction == SHIFT_RIGHT);
ifp = XFS_IFORK_PTR(ip, whichfork);
if (!(ifp->if_flags & XFS_IFEXTENTS)) {
@@ -5614,44 +5658,84 @@ xfs_bmap_shift_extents(
cur->bc_private.b.flags = 0;
}
/*
* Look up the extent index for the fsb where we start shifting. We can
* henceforth iterate with current_ext as extent list changes are locked
* out via ilock.
*
* gotp can be null in 2 cases: 1) if there are no extents or 2)
* start_fsb lies in a hole beyond which there are no extents. Either
* way, we are done.
*/
gotp = xfs_iext_bno_to_ext(ifp, start_fsb, &current_ext);
if (!gotp) {
*done = 1;
goto del_cursor;
}
/*
* There may be delalloc extents in the data fork before the range we
* are collapsing out, so we cannot use the count of real extents here.
* Instead we have to calculate it from the incore fork.
*/
total_extents = ifp->if_bytes / sizeof(xfs_bmbt_rec_t);
while (nexts++ < num_exts && current_ext < total_extents) {
if (total_extents == 0) {
*done = 1;
goto del_cursor;
}
/*
* In case of first right shift, we need to initialize next_fsb
*/
if (*next_fsb == NULLFSBLOCK) {
gotp = xfs_iext_get_ext(ifp, total_extents - 1);
xfs_bmbt_get_all(gotp, &got);
*next_fsb = got.br_startoff;
if (stop_fsb > *next_fsb) {
*done = 1;
goto del_cursor;
}
}
/* Lookup the extent index at which we have to stop */
if (direction == SHIFT_RIGHT) {
gotp = xfs_iext_bno_to_ext(ifp, stop_fsb, &stop_extent);
/* Make stop_extent exclusive of shift range */
stop_extent--;
} else
stop_extent = total_extents;
/*
* Look up the extent index for the fsb where we start shifting. We can
* henceforth iterate with current_ext as extent list changes are locked
* out via ilock.
*
* gotp can be null in 2 cases: 1) if there are no extents or 2)
* *next_fsb lies in a hole beyond which there are no extents. Either
* way, we are done.
*/
gotp = xfs_iext_bno_to_ext(ifp, *next_fsb, &current_ext);
if (!gotp) {
*done = 1;
goto del_cursor;
}
/* some sanity checking before we finally start shifting extents */
if ((direction == SHIFT_LEFT && current_ext >= stop_extent) ||
(direction == SHIFT_RIGHT && current_ext <= stop_extent)) {
error = -EIO;
goto del_cursor;
}
while (nexts++ < num_exts) {
error = xfs_bmse_shift_one(ip, whichfork, offset_shift_fsb,
&current_ext, gotp, cur, &logflags);
&current_ext, gotp, cur, &logflags,
direction);
if (error)
goto del_cursor;
/*
* If there was an extent merge during the shift, the extent
* count can change. Update the total and grade the next record.
*/
if (direction == SHIFT_LEFT) {
total_extents = ifp->if_bytes / sizeof(xfs_bmbt_rec_t);
stop_extent = total_extents;
}
/* update total extent count and grab the next record */
total_extents = ifp->if_bytes / sizeof(xfs_bmbt_rec_t);
if (current_ext >= total_extents)
if (current_ext == stop_extent) {
*done = 1;
*next_fsb = NULLFSBLOCK;
break;
}
gotp = xfs_iext_get_ext(ifp, current_ext);
}
/* Check if we are done */
if (current_ext == total_extents) {
*done = 1;
} else if (next_fsb) {
if (!*done) {
xfs_bmbt_get_all(gotp, &got);
*next_fsb = got.br_startoff;
}
@@ -5666,3 +5750,189 @@ del_cursor:
return error;
}
/*
* Splits an extent into two extents at split_fsb block such that it is
* the first block of the current_ext. @current_ext is a target extent
* to be split. @split_fsb is a block where the extents is split.
* If split_fsb lies in a hole or the first block of extents, just return 0.
*/
STATIC int
xfs_bmap_split_extent_at(
struct xfs_trans *tp,
struct xfs_inode *ip,
xfs_fileoff_t split_fsb,
xfs_fsblock_t *firstfsb,
struct xfs_bmap_free *free_list)
{
int whichfork = XFS_DATA_FORK;
struct xfs_btree_cur *cur = NULL;
struct xfs_bmbt_rec_host *gotp;
struct xfs_bmbt_irec got;
struct xfs_bmbt_irec new; /* split extent */
struct xfs_mount *mp = ip->i_mount;
struct xfs_ifork *ifp;
xfs_fsblock_t gotblkcnt; /* new block count for got */
xfs_extnum_t current_ext;
int error = 0;
int logflags = 0;
int i = 0;
if (unlikely(XFS_TEST_ERROR(
(XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS &&
XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE),
mp, XFS_ERRTAG_BMAPIFORMAT, XFS_RANDOM_BMAPIFORMAT))) {
XFS_ERROR_REPORT("xfs_bmap_split_extent_at",
XFS_ERRLEVEL_LOW, mp);
return -EFSCORRUPTED;
}
if (XFS_FORCED_SHUTDOWN(mp))
return -EIO;
ifp = XFS_IFORK_PTR(ip, whichfork);
if (!(ifp->if_flags & XFS_IFEXTENTS)) {
/* Read in all the extents */
error = xfs_iread_extents(tp, ip, whichfork);
if (error)
return error;
}
/*
* gotp can be null in 2 cases: 1) if there are no extents
* or 2) split_fsb lies in a hole beyond which there are
* no extents. Either way, we are done.
*/
gotp = xfs_iext_bno_to_ext(ifp, split_fsb, &current_ext);
if (!gotp)
return 0;
xfs_bmbt_get_all(gotp, &got);
/*
* Check split_fsb lies in a hole or the start boundary offset
* of the extent.
*/
if (got.br_startoff >= split_fsb)
return 0;
gotblkcnt = split_fsb - got.br_startoff;
new.br_startoff = split_fsb;
new.br_startblock = got.br_startblock + gotblkcnt;
new.br_blockcount = got.br_blockcount - gotblkcnt;
new.br_state = got.br_state;
if (ifp->if_flags & XFS_IFBROOT) {
cur = xfs_bmbt_init_cursor(mp, tp, ip, whichfork);
cur->bc_private.b.firstblock = *firstfsb;
cur->bc_private.b.flist = free_list;
cur->bc_private.b.flags = 0;
error = xfs_bmbt_lookup_eq(cur, got.br_startoff,
got.br_startblock,
got.br_blockcount,
&i);
if (error)
goto del_cursor;
XFS_WANT_CORRUPTED_GOTO(mp, i == 1, del_cursor);
}
xfs_bmbt_set_blockcount(gotp, gotblkcnt);
got.br_blockcount = gotblkcnt;
logflags = XFS_ILOG_CORE;
if (cur) {
error = xfs_bmbt_update(cur, got.br_startoff,
got.br_startblock,
got.br_blockcount,
got.br_state);
if (error)
goto del_cursor;
} else
logflags |= XFS_ILOG_DEXT;
/* Add new extent */
current_ext++;
xfs_iext_insert(ip, current_ext, 1, &new, 0);
XFS_IFORK_NEXT_SET(ip, whichfork,
XFS_IFORK_NEXTENTS(ip, whichfork) + 1);
if (cur) {
error = xfs_bmbt_lookup_eq(cur, new.br_startoff,
new.br_startblock, new.br_blockcount,
&i);
if (error)
goto del_cursor;
XFS_WANT_CORRUPTED_GOTO(mp, i == 0, del_cursor);
cur->bc_rec.b.br_state = new.br_state;
error = xfs_btree_insert(cur, &i);
if (error)
goto del_cursor;
XFS_WANT_CORRUPTED_GOTO(mp, i == 1, del_cursor);
}
/*
* Convert to a btree if necessary.
*/
if (xfs_bmap_needs_btree(ip, whichfork)) {
int tmp_logflags; /* partial log flag return val */
ASSERT(cur == NULL);
error = xfs_bmap_extents_to_btree(tp, ip, firstfsb, free_list,
&cur, 0, &tmp_logflags, whichfork);
logflags |= tmp_logflags;
}
del_cursor:
if (cur) {
cur->bc_private.b.allocated = 0;
xfs_btree_del_cursor(cur,
error ? XFS_BTREE_ERROR : XFS_BTREE_NOERROR);
}
if (logflags)
xfs_trans_log_inode(tp, ip, logflags);
return error;
}
int
xfs_bmap_split_extent(
struct xfs_inode *ip,
xfs_fileoff_t split_fsb)
{
struct xfs_mount *mp = ip->i_mount;
struct xfs_trans *tp;
struct xfs_bmap_free free_list;
xfs_fsblock_t firstfsb;
int committed;
int error;
tp = xfs_trans_alloc(mp, XFS_TRANS_DIOSTRAT);
error = xfs_trans_reserve(tp, &M_RES(mp)->tr_write,
XFS_DIOSTRAT_SPACE_RES(mp, 0), 0);
if (error) {
xfs_trans_cancel(tp, 0);
return error;
}
xfs_ilock(ip, XFS_ILOCK_EXCL);
xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
xfs_bmap_init(&free_list, &firstfsb);
error = xfs_bmap_split_extent_at(tp, ip, split_fsb,
&firstfsb, &free_list);
if (error)
goto out;
error = xfs_bmap_finish(&tp, &free_list, &committed);
if (error)
goto out;
return xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
out:
xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT);
return error;
}