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Merge branch 'xfs-4.9-delalloc-rework' into for-next

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This commit is contained in:
Dave Chinner 2016-10-03 09:52:51 +11:00
commit a89b3f97bb
6 changed files with 247 additions and 355 deletions
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89
fs/xfs/libxfs/xfs_bmap.c
View File

@ -1389,7 +1389,7 @@ xfs_bmap_search_multi_extents(
* Else, *lastxp will be set to the index of the found
* entry; *gotp will contain the entry.
*/
STATIC xfs_bmbt_rec_host_t * /* pointer to found extent entry */
xfs_bmbt_rec_host_t * /* pointer to found extent entry */
xfs_bmap_search_extents(
xfs_inode_t *ip, /* incore inode pointer */
xfs_fileoff_t bno, /* block number searched for */
@ -4076,7 +4076,7 @@ xfs_bmapi_read(
return 0;
}
STATIC int
int
xfs_bmapi_reserve_delalloc(
struct xfs_inode *ip,
xfs_fileoff_t aoff,
@ -4172,91 +4172,6 @@ xfs_bmapi_reserve_delalloc(
return error;
}
/*
* Map file blocks to filesystem blocks, adding delayed allocations as needed.
*/
int
xfs_bmapi_delay(
struct xfs_inode *ip, /* incore inode */
xfs_fileoff_t bno, /* starting file offs. mapped */
xfs_filblks_t len, /* length to map in file */
struct xfs_bmbt_irec *mval, /* output: map values */
int *nmap, /* i/o: mval size/count */
int flags) /* XFS_BMAPI_... */
{
struct xfs_mount *mp = ip->i_mount;
struct xfs_ifork *ifp = XFS_IFORK_PTR(ip, XFS_DATA_FORK);
struct xfs_bmbt_irec got; /* current file extent record */
struct xfs_bmbt_irec prev; /* previous file extent record */
xfs_fileoff_t obno; /* old block number (offset) */
xfs_fileoff_t end; /* end of mapped file region */
xfs_extnum_t lastx; /* last useful extent number */
int eof; /* we've hit the end of extents */
int n = 0; /* current extent index */
int error = 0;
ASSERT(*nmap >= 1);
ASSERT(*nmap <= XFS_BMAP_MAX_NMAP);
ASSERT(!(flags & ~XFS_BMAPI_ENTIRE));
ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
if (unlikely(XFS_TEST_ERROR(
(XFS_IFORK_FORMAT(ip, XFS_DATA_FORK) != XFS_DINODE_FMT_EXTENTS &&
XFS_IFORK_FORMAT(ip, XFS_DATA_FORK) != XFS_DINODE_FMT_BTREE),
mp, XFS_ERRTAG_BMAPIFORMAT, XFS_RANDOM_BMAPIFORMAT))) {
XFS_ERROR_REPORT("xfs_bmapi_delay", XFS_ERRLEVEL_LOW, mp);
return -EFSCORRUPTED;
}
if (XFS_FORCED_SHUTDOWN(mp))
return -EIO;
XFS_STATS_INC(mp, xs_blk_mapw);
if (!(ifp->if_flags & XFS_IFEXTENTS)) {
error = xfs_iread_extents(NULL, ip, XFS_DATA_FORK);
if (error)
return error;
}
xfs_bmap_search_extents(ip, bno, XFS_DATA_FORK, &eof, &lastx, &got, &prev);
end = bno + len;
obno = bno;
while (bno < end && n < *nmap) {
if (eof || got.br_startoff > bno) {
error = xfs_bmapi_reserve_delalloc(ip, bno, len, &got,
&prev, &lastx, eof);
if (error) {
if (n == 0) {
*nmap = 0;
return error;
}
break;
}
}
/* set up the extent map to return. */
xfs_bmapi_trim_map(mval, &got, &bno, len, obno, end, n, flags);
xfs_bmapi_update_map(&mval, &bno, &len, obno, end, &n, flags);
/* If we're done, stop now. */
if (bno >= end || n >= *nmap)
break;
/* Else go on to the next record. */
prev = got;
if (++lastx < ifp->if_bytes / sizeof(xfs_bmbt_rec_t))
xfs_bmbt_get_all(xfs_iext_get_ext(ifp, lastx), &got);
else
eof = 1;
}
*nmap = n;
return 0;
}
static int
xfs_bmapi_allocate(
struct xfs_bmalloca *bma)

10
fs/xfs/libxfs/xfs_bmap.h
View File

@ -181,9 +181,6 @@ int xfs_bmap_read_extents(struct xfs_trans *tp, struct xfs_inode *ip,
int xfs_bmapi_read(struct xfs_inode *ip, xfs_fileoff_t bno,
xfs_filblks_t len, struct xfs_bmbt_irec *mval,
int *nmap, int flags);
int xfs_bmapi_delay(struct xfs_inode *ip, xfs_fileoff_t bno,
xfs_filblks_t len, struct xfs_bmbt_irec *mval,
int *nmap, int flags);
int xfs_bmapi_write(struct xfs_trans *tp, struct xfs_inode *ip,
xfs_fileoff_t bno, xfs_filblks_t len, int flags,
xfs_fsblock_t *firstblock, xfs_extlen_t total,
@ -202,5 +199,12 @@ int xfs_bmap_shift_extents(struct xfs_trans *tp, struct xfs_inode *ip,
struct xfs_defer_ops *dfops, enum shift_direction direction,
int num_exts);
int xfs_bmap_split_extent(struct xfs_inode *ip, xfs_fileoff_t split_offset);
struct xfs_bmbt_rec_host *
xfs_bmap_search_extents(struct xfs_inode *ip, xfs_fileoff_t bno,
int fork, int *eofp, xfs_extnum_t *lastxp,
struct xfs_bmbt_irec *gotp, struct xfs_bmbt_irec *prevp);
int xfs_bmapi_reserve_delalloc(struct xfs_inode *ip, xfs_fileoff_t aoff,
xfs_filblks_t len, struct xfs_bmbt_irec *got,
struct xfs_bmbt_irec *prev, xfs_extnum_t *lastx, int eof);
#endif /* __XFS_BMAP_H__ */

14
fs/xfs/xfs_icache.c
View File

@ -1414,6 +1414,16 @@ xfs_inode_set_eofblocks_tag(
struct xfs_perag *pag;
int tagged;
/*
* Don't bother locking the AG and looking up in the radix trees
* if we already know that we have the tag set.
*/
if (ip->i_flags & XFS_IEOFBLOCKS)
return;
spin_lock(&ip->i_flags_lock);
ip->i_flags |= XFS_IEOFBLOCKS;
spin_unlock(&ip->i_flags_lock);
pag = xfs_perag_get(mp, XFS_INO_TO_AGNO(mp, ip->i_ino));
spin_lock(&pag->pag_ici_lock);
trace_xfs_inode_set_eofblocks_tag(ip);
@ -1449,6 +1459,10 @@ xfs_inode_clear_eofblocks_tag(
struct xfs_mount *mp = ip->i_mount;
struct xfs_perag *pag;
spin_lock(&ip->i_flags_lock);
ip->i_flags &= ~XFS_IEOFBLOCKS;
spin_unlock(&ip->i_flags_lock);
pag = xfs_perag_get(mp, XFS_INO_TO_AGNO(mp, ip->i_ino));
spin_lock(&pag->pag_ici_lock);
trace_xfs_inode_clear_eofblocks_tag(ip);

1
fs/xfs/xfs_inode.h
View File

@ -216,6 +216,7 @@ xfs_get_initial_prid(struct xfs_inode *dp)
#define __XFS_IPINNED_BIT 8 /* wakeup key for zero pin count */
#define XFS_IPINNED (1 << __XFS_IPINNED_BIT)
#define XFS_IDONTCACHE (1 << 9) /* don't cache the inode long term */
#define XFS_IEOFBLOCKS (1 << 10)/* has the preallocblocks tag set */
/*
* Per-lifetime flags need to be reset when re-using a reclaimable inode during

486
fs/xfs/xfs_iomap.c
View File

@ -1,5 +1,6 @@
/*
* Copyright (c) 2000-2006 Silicon Graphics, Inc.
* Copyright (c) 2016 Christoph Hellwig.
* All Rights Reserved.
*
* This program is free software; you can redistribute it and/or
@ -42,17 +43,40 @@
#define XFS_WRITEIO_ALIGN(mp,off) (((off) >> mp->m_writeio_log) \
<< mp->m_writeio_log)
#define XFS_WRITE_IMAPS XFS_BMAP_MAX_NMAP
STATIC int
xfs_iomap_eof_align_last_fsb(
xfs_mount_t *mp,
xfs_inode_t *ip,
xfs_extlen_t extsize,
xfs_fileoff_t *last_fsb)
void
xfs_bmbt_to_iomap(
struct xfs_inode *ip,
struct iomap *iomap,
struct xfs_bmbt_irec *imap)
{
xfs_extlen_t align = 0;
int eof, error;
struct xfs_mount *mp = ip->i_mount;
if (imap->br_startblock == HOLESTARTBLOCK) {
iomap->blkno = IOMAP_NULL_BLOCK;
iomap->type = IOMAP_HOLE;
} else if (imap->br_startblock == DELAYSTARTBLOCK) {
iomap->blkno = IOMAP_NULL_BLOCK;
iomap->type = IOMAP_DELALLOC;
} else {
iomap->blkno = xfs_fsb_to_db(ip, imap->br_startblock);
if (imap->br_state == XFS_EXT_UNWRITTEN)
iomap->type = IOMAP_UNWRITTEN;
else
iomap->type = IOMAP_MAPPED;
}
iomap->offset = XFS_FSB_TO_B(mp, imap->br_startoff);
iomap->length = XFS_FSB_TO_B(mp, imap->br_blockcount);
iomap->bdev = xfs_find_bdev_for_inode(VFS_I(ip));
}
static xfs_extlen_t
xfs_eof_alignment(
struct xfs_inode *ip,
xfs_extlen_t extsize)
{
struct xfs_mount *mp = ip->i_mount;
xfs_extlen_t align = 0;
if (!XFS_IS_REALTIME_INODE(ip)) {
/*
@ -83,8 +107,21 @@ xfs_iomap_eof_align_last_fsb(
align = extsize;
}
return align;
}
STATIC int
xfs_iomap_eof_align_last_fsb(
struct xfs_inode *ip,
xfs_extlen_t extsize,
xfs_fileoff_t *last_fsb)
{
xfs_extlen_t align = xfs_eof_alignment(ip, extsize);
if (align) {
xfs_fileoff_t new_last_fsb = roundup_64(*last_fsb, align);
int eof, error;
error = xfs_bmap_eof(ip, new_last_fsb, XFS_DATA_FORK, &eof);
if (error)
return error;
@ -154,7 +191,7 @@ xfs_iomap_write_direct(
*/
ASSERT(XFS_IFORK_PTR(ip, XFS_DATA_FORK)->if_flags &
XFS_IFEXTENTS);
error = xfs_iomap_eof_align_last_fsb(mp, ip, extsz, &last_fsb);
error = xfs_iomap_eof_align_last_fsb(ip, extsz, &last_fsb);
if (error)
goto out_unlock;
} else {
@ -274,130 +311,6 @@ xfs_iomap_write_direct(
goto out_unlock;
}
/*
* If the caller is doing a write at the end of the file, then extend the
* allocation out to the file system's write iosize. We clean up any extra
* space left over when the file is closed in xfs_inactive().
*
* If we find we already have delalloc preallocation beyond EOF, don't do more
* preallocation as it it not needed.
*/
STATIC int
xfs_iomap_eof_want_preallocate(
xfs_mount_t *mp,
xfs_inode_t *ip,
xfs_off_t offset,
size_t count,
xfs_bmbt_irec_t *imap,
int nimaps,
int *prealloc)
{
xfs_fileoff_t start_fsb;
xfs_filblks_t count_fsb;
int n, error, imaps;
int found_delalloc = 0;
*prealloc = 0;
if (offset + count <= XFS_ISIZE(ip))
return 0;
/*
* If the file is smaller than the minimum prealloc and we are using
* dynamic preallocation, don't do any preallocation at all as it is
* likely this is the only write to the file that is going to be done.
*/
if (!(mp->m_flags & XFS_MOUNT_DFLT_IOSIZE) &&
XFS_ISIZE(ip) < XFS_FSB_TO_B(mp, mp->m_writeio_blocks))
return 0;
/*
* If there are any real blocks past eof, then don't
* do any speculative allocation.
*/
start_fsb = XFS_B_TO_FSBT(mp, ((xfs_ufsize_t)(offset + count - 1)));
count_fsb = XFS_B_TO_FSB(mp, mp->m_super->s_maxbytes);
while (count_fsb > 0) {
imaps = nimaps;
error = xfs_bmapi_read(ip, start_fsb, count_fsb, imap, &imaps,
0);
if (error)
return error;
for (n = 0; n < imaps; n++) {
if ((imap[n].br_startblock != HOLESTARTBLOCK) &&
(imap[n].br_startblock != DELAYSTARTBLOCK))
return 0;
start_fsb += imap[n].br_blockcount;
count_fsb -= imap[n].br_blockcount;
if (imap[n].br_startblock == DELAYSTARTBLOCK)
found_delalloc = 1;
}
}
if (!found_delalloc)
*prealloc = 1;
return 0;
}
/*
* Determine the initial size of the preallocation. We are beyond the current
* EOF here, but we need to take into account whether this is a sparse write or
* an extending write when determining the preallocation size. Hence we need to
* look up the extent that ends at the current write offset and use the result
* to determine the preallocation size.
*
* If the extent is a hole, then preallocation is essentially disabled.
* Otherwise we take the size of the preceeding data extent as the basis for the
* preallocation size. If the size of the extent is greater than half the
* maximum extent length, then use the current offset as the basis. This ensures
* that for large files the preallocation size always extends to MAXEXTLEN
* rather than falling short due to things like stripe unit/width alignment of
* real extents.
*/
STATIC xfs_fsblock_t
xfs_iomap_eof_prealloc_initial_size(
struct xfs_mount *mp,
struct xfs_inode *ip,
xfs_off_t offset,
xfs_bmbt_irec_t *imap,
int nimaps)
{
xfs_fileoff_t start_fsb;
int imaps = 1;
int error;
ASSERT(nimaps >= imaps);
/* if we are using a specific prealloc size, return now */
if (mp->m_flags & XFS_MOUNT_DFLT_IOSIZE)
return 0;
/* If the file is small, then use the minimum prealloc */
if (XFS_ISIZE(ip) < XFS_FSB_TO_B(mp, mp->m_dalign))
return 0;
/*
* As we write multiple pages, the offset will always align to the
* start of a page and hence point to a hole at EOF. i.e. if the size is
* 4096 bytes, we only have one block at FSB 0, but XFS_B_TO_FSB(4096)
* will return FSB 1. Hence if there are blocks in the file, we want to
* point to the block prior to the EOF block and not the hole that maps
* directly at @offset.
*/
start_fsb = XFS_B_TO_FSB(mp, offset);
if (start_fsb)
start_fsb--;
error = xfs_bmapi_read(ip, start_fsb, 1, imap, &imaps, XFS_BMAPI_ENTIRE);
if (error)
return 0;
ASSERT(imaps == 1);
if (imap[0].br_startblock == HOLESTARTBLOCK)
return 0;
if (imap[0].br_blockcount <= (MAXEXTLEN >> 1))
return imap[0].br_blockcount << 1;
return XFS_B_TO_FSB(mp, offset);
}
STATIC bool
xfs_quota_need_throttle(
struct xfs_inode *ip,
@ -459,27 +372,76 @@ xfs_quota_calc_throttle(
}
/*
* If we are doing a write at the end of the file and there are no allocations
* past this one, then extend the allocation out to the file system's write
* iosize.
*
* If we don't have a user specified preallocation size, dynamically increase
* the preallocation size as the size of the file grows. Cap the maximum size
* the preallocation size as the size of the file grows. Cap the maximum size
* at a single extent or less if the filesystem is near full. The closer the
* filesystem is to full, the smaller the maximum prealocation.
*
* As an exception we don't do any preallocation at all if the file is smaller
* than the minimum preallocation and we are using the default dynamic
* preallocation scheme, as it is likely this is the only write to the file that
* is going to be done.
*
* We clean up any extra space left over when the file is closed in
* xfs_inactive().
*/
STATIC xfs_fsblock_t
xfs_iomap_prealloc_size(
struct xfs_mount *mp,
struct xfs_inode *ip,
xfs_off_t offset,
struct xfs_bmbt_irec *imap,
int nimaps)
loff_t offset,
loff_t count,
xfs_extnum_t idx,
struct xfs_bmbt_irec *prev)
{
xfs_fsblock_t alloc_blocks = 0;
struct xfs_mount *mp = ip->i_mount;
xfs_fileoff_t offset_fsb = XFS_B_TO_FSBT(mp, offset);
int shift = 0;
int64_t freesp;
xfs_fsblock_t qblocks;
int qshift = 0;
xfs_fsblock_t alloc_blocks = 0;
alloc_blocks = xfs_iomap_eof_prealloc_initial_size(mp, ip, offset,
imap, nimaps);
if (offset + count <= XFS_ISIZE(ip))
return 0;
if (!(mp->m_flags & XFS_MOUNT_DFLT_IOSIZE) &&
(XFS_ISIZE(ip) < XFS_FSB_TO_B(mp, mp->m_writeio_blocks)))
return 0;
/*
* If an explicit allocsize is set, the file is small, or we
* are writing behind a hole, then use the minimum prealloc:
*/
if ((mp->m_flags & XFS_MOUNT_DFLT_IOSIZE) ||
XFS_ISIZE(ip) < XFS_FSB_TO_B(mp, mp->m_dalign) ||
idx == 0 ||
prev->br_startoff + prev->br_blockcount < offset_fsb)
return mp->m_writeio_blocks;
/*
* Determine the initial size of the preallocation. We are beyond the
* current EOF here, but we need to take into account whether this is
* a sparse write or an extending write when determining the
* preallocation size. Hence we need to look up the extent that ends
* at the current write offset and use the result to determine the
* preallocation size.
*
* If the extent is a hole, then preallocation is essentially disabled.
* Otherwise we take the size of the preceding data extent as the basis
* for the preallocation size. If the size of the extent is greater than
* half the maximum extent length, then use the current offset as the
* basis. This ensures that for large files the preallocation size
* always extends to MAXEXTLEN rather than falling short due to things
* like stripe unit/width alignment of real extents.
*/
if (prev->br_blockcount <= (MAXEXTLEN >> 1))
alloc_blocks = prev->br_blockcount << 1;
else
alloc_blocks = XFS_B_TO_FSB(mp, offset);
if (!alloc_blocks)
goto check_writeio;
qblocks = alloc_blocks;
@ -550,120 +512,145 @@ xfs_iomap_prealloc_size(
*/
while (alloc_blocks && alloc_blocks >= freesp)
alloc_blocks >>= 4;
check_writeio:
if (alloc_blocks < mp->m_writeio_blocks)
alloc_blocks = mp->m_writeio_blocks;
trace_xfs_iomap_prealloc_size(ip, alloc_blocks, shift,
mp->m_writeio_blocks);
return alloc_blocks;
}
int
xfs_iomap_write_delay(
xfs_inode_t *ip,
xfs_off_t offset,
size_t count,
xfs_bmbt_irec_t *ret_imap)
static int
xfs_file_iomap_begin_delay(
struct inode *inode,
loff_t offset,
loff_t count,
unsigned flags,
struct iomap *iomap)
{
xfs_mount_t *mp = ip->i_mount;
xfs_fileoff_t offset_fsb;
xfs_fileoff_t last_fsb;
xfs_off_t aligned_offset;
xfs_fileoff_t ioalign;
xfs_extlen_t extsz;
int nimaps;
xfs_bmbt_irec_t imap[XFS_WRITE_IMAPS];
int prealloc;
int error;
struct xfs_inode *ip = XFS_I(inode);
struct xfs_mount *mp = ip->i_mount;
struct xfs_ifork *ifp = XFS_IFORK_PTR(ip, XFS_DATA_FORK);
xfs_fileoff_t offset_fsb = XFS_B_TO_FSBT(mp, offset);
xfs_fileoff_t maxbytes_fsb =
XFS_B_TO_FSB(mp, mp->m_super->s_maxbytes);
xfs_fileoff_t end_fsb, orig_end_fsb;
int error = 0, eof = 0;
struct xfs_bmbt_irec got;
struct xfs_bmbt_irec prev;
xfs_extnum_t idx;
ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
ASSERT(!XFS_IS_REALTIME_INODE(ip));
ASSERT(!xfs_get_extsz_hint(ip));
xfs_ilock(ip, XFS_ILOCK_EXCL);
if (unlikely(XFS_TEST_ERROR(
(XFS_IFORK_FORMAT(ip, XFS_DATA_FORK) != XFS_DINODE_FMT_EXTENTS &&
XFS_IFORK_FORMAT(ip, XFS_DATA_FORK) != XFS_DINODE_FMT_BTREE),
mp, XFS_ERRTAG_BMAPIFORMAT, XFS_RANDOM_BMAPIFORMAT))) {
XFS_ERROR_REPORT(__func__, XFS_ERRLEVEL_LOW, mp);
error = -EFSCORRUPTED;
goto out_unlock;
}
XFS_STATS_INC(mp, xs_blk_mapw);
if (!(ifp->if_flags & XFS_IFEXTENTS)) {
error = xfs_iread_extents(NULL, ip, XFS_DATA_FORK);
if (error)
goto out_unlock;
}
xfs_bmap_search_extents(ip, offset_fsb, XFS_DATA_FORK, &eof, &idx,
&got, &prev);
if (!eof && got.br_startoff <= offset_fsb) {
trace_xfs_iomap_found(ip, offset, count, 0, &got);
goto done;
}
/*
* Make sure that the dquots are there. This doesn't hold
* the ilock across a disk read.
*/
error = xfs_qm_dqattach_locked(ip, 0);
if (error)
return error;
goto out_unlock;
extsz = xfs_get_extsz_hint(ip);
offset_fsb = XFS_B_TO_FSBT(mp, offset);
/*
* We cap the maximum length we map here to MAX_WRITEBACK_PAGES pages
* to keep the chunks of work done where somewhat symmetric with the
* work writeback does. This is a completely arbitrary number pulled
* out of thin air as a best guess for initial testing.
*
* Note that the values needs to be less than 32-bits wide until
* the lower level functions are updated.
*/
count = min_t(loff_t, count, 1024 * PAGE_SIZE);
end_fsb = orig_end_fsb =
min(XFS_B_TO_FSB(mp, offset + count), maxbytes_fsb);
error = xfs_iomap_eof_want_preallocate(mp, ip, offset, count,
imap, XFS_WRITE_IMAPS, &prealloc);
if (error)
return error;
if (eof) {
xfs_fsblock_t prealloc_blocks;
prealloc_blocks =
xfs_iomap_prealloc_size(ip, offset, count, idx, &prev);
if (prealloc_blocks) {
xfs_extlen_t align;
xfs_off_t end_offset;
end_offset = XFS_WRITEIO_ALIGN(mp, offset + count - 1);
end_fsb = XFS_B_TO_FSBT(mp, end_offset) +
prealloc_blocks;
align = xfs_eof_alignment(ip, 0);
if (align)
end_fsb = roundup_64(end_fsb, align);
end_fsb = min(end_fsb, maxbytes_fsb);
ASSERT(end_fsb > offset_fsb);
}
}
retry:
if (prealloc) {
xfs_fsblock_t alloc_blocks;
alloc_blocks = xfs_iomap_prealloc_size(mp, ip, offset, imap,
XFS_WRITE_IMAPS);
aligned_offset = XFS_WRITEIO_ALIGN(mp, (offset + count - 1));
ioalign = XFS_B_TO_FSBT(mp, aligned_offset);
last_fsb = ioalign + alloc_blocks;
} else {
last_fsb = XFS_B_TO_FSB(mp, ((xfs_ufsize_t)(offset + count)));
}
if (prealloc || extsz) {
error = xfs_iomap_eof_align_last_fsb(mp, ip, extsz, &last_fsb);
if (error)
return error;
}
/*
* Make sure preallocation does not create extents beyond the range we
* actually support in this filesystem.
*/
if (last_fsb > XFS_B_TO_FSB(mp, mp->m_super->s_maxbytes))
last_fsb = XFS_B_TO_FSB(mp, mp->m_super->s_maxbytes);
ASSERT(last_fsb > offset_fsb);
nimaps = XFS_WRITE_IMAPS;
error = xfs_bmapi_delay(ip, offset_fsb, last_fsb - offset_fsb,
imap, &nimaps, XFS_BMAPI_ENTIRE);
error = xfs_bmapi_reserve_delalloc(ip, offset_fsb,
end_fsb - offset_fsb, &got,
&prev, &idx, eof);
switch (error) {
case 0:
break;
case -ENOSPC:
case -EDQUOT:
break;
default:
return error;
}
/*
* If bmapi returned us nothing, we got either ENOSPC or EDQUOT. Retry
* without EOF preallocation.
*/
if (nimaps == 0) {
/* retry without any preallocation */
trace_xfs_delalloc_enospc(ip, offset, count);
if (prealloc) {
prealloc = 0;
error = 0;
if (end_fsb != orig_end_fsb) {
end_fsb = orig_end_fsb;
goto retry;
}
return error ? error : -ENOSPC;
/*FALLTHRU*/
default:
goto out_unlock;
}
if (!(imap[0].br_startblock || XFS_IS_REALTIME_INODE(ip)))
return xfs_alert_fsblock_zero(ip, &imap[0]);
/*
* Tag the inode as speculatively preallocated so we can reclaim this
* space on demand, if necessary.
*/
if (prealloc)
if (end_fsb != orig_end_fsb)
xfs_inode_set_eofblocks_tag(ip);
*ret_imap = imap[0];
return 0;
trace_xfs_iomap_alloc(ip, offset, count, 0, &got);
done:
if (isnullstartblock(got.br_startblock))
got.br_startblock = DELAYSTARTBLOCK;
if (!got.br_startblock) {
error = xfs_alert_fsblock_zero(ip, &got);
if (error)
goto out_unlock;
}
xfs_bmbt_to_iomap(ip, iomap, &got);
out_unlock:
xfs_iunlock(ip, XFS_ILOCK_EXCL);
return error;
}
/*
@ -947,32 +934,6 @@ xfs_iomap_write_unwritten(
return error;
}
void
xfs_bmbt_to_iomap(
struct xfs_inode *ip,
struct iomap *iomap,
struct xfs_bmbt_irec *imap)
{
struct xfs_mount *mp = ip->i_mount;
if (imap->br_startblock == HOLESTARTBLOCK) {
iomap->blkno = IOMAP_NULL_BLOCK;
iomap->type = IOMAP_HOLE;
} else if (imap->br_startblock == DELAYSTARTBLOCK) {
iomap->blkno = IOMAP_NULL_BLOCK;
iomap->type = IOMAP_DELALLOC;
} else {
iomap->blkno = xfs_fsb_to_db(ip, imap->br_startblock);
if (imap->br_state == XFS_EXT_UNWRITTEN)
iomap->type = IOMAP_UNWRITTEN;
else
iomap->type = IOMAP_MAPPED;
}
iomap->offset = XFS_FSB_TO_B(mp, imap->br_startoff);
iomap->length = XFS_FSB_TO_B(mp, imap->br_blockcount);
iomap->bdev = xfs_find_bdev_for_inode(VFS_I(ip));
}
static inline bool imap_needs_alloc(struct xfs_bmbt_irec *imap, int nimaps)
{
return !nimaps ||
@ -997,6 +958,11 @@ xfs_file_iomap_begin(
if (XFS_FORCED_SHUTDOWN(mp))
return -EIO;
if ((flags & IOMAP_WRITE) && !xfs_get_extsz_hint(ip)) {
return xfs_file_iomap_begin_delay(inode, offset, length, flags,
iomap);
}
xfs_ilock(ip, XFS_ILOCK_EXCL);
ASSERT(offset <= mp->m_super->s_maxbytes);
@ -1024,19 +990,13 @@ xfs_file_iomap_begin(
* the lower level functions are updated.
*/
length = min_t(loff_t, length, 1024 * PAGE_SIZE);
if (xfs_get_extsz_hint(ip)) {
/*
* xfs_iomap_write_direct() expects the shared lock. It
* is unlocked on return.
*/
xfs_ilock_demote(ip, XFS_ILOCK_EXCL);
error = xfs_iomap_write_direct(ip, offset, length, &imap,
nimaps);
} else {
error = xfs_iomap_write_delay(ip, offset, length, &imap);
xfs_iunlock(ip, XFS_ILOCK_EXCL);
}
/*
* xfs_iomap_write_direct() expects the shared lock. It
* is unlocked on return.
*/
xfs_ilock_demote(ip, XFS_ILOCK_EXCL);
error = xfs_iomap_write_direct(ip, offset, length, &imap,
nimaps);
if (error)
return error;

2
fs/xfs/xfs_iomap.h
View File

@ -25,8 +25,6 @@ struct xfs_bmbt_irec;
int xfs_iomap_write_direct(struct xfs_inode *, xfs_off_t, size_t,
struct xfs_bmbt_irec *, int);
int xfs_iomap_write_delay(struct xfs_inode *, xfs_off_t, size_t,
struct xfs_bmbt_irec *);
int xfs_iomap_write_allocate(struct xfs_inode *, xfs_off_t,
struct xfs_bmbt_irec *);
int xfs_iomap_write_unwritten(struct xfs_inode *, xfs_off_t, xfs_off_t);