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xfs: factor out a helper to calculate the end_fsb 

We have lots of places that want to calculate the final fsb for
a offset + count in bytes and check that the result fits into
s_maxbytes.  Factor out a helper for that.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Allison Collins <allison.henderson@oracle.com>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
This commit is contained in:
Christoph Hellwig 2019-10-19 09:09:44 -07:00 committed by Darrick J. Wong
parent 36adcbace2
commit 43568226a4
1 changed files with 20 additions and 20 deletions
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40
fs/xfs/xfs_iomap.c
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@ -102,6 +102,17 @@ xfs_hole_to_iomap(
iomap->dax_dev = xfs_find_daxdev_for_inode(VFS_I(ip));
}
static inline xfs_fileoff_t
xfs_iomap_end_fsb(
struct xfs_mount *mp,
loff_t offset,
loff_t count)
{
ASSERT(offset <= mp->m_super->s_maxbytes);
return min(XFS_B_TO_FSB(mp, offset + count),
XFS_B_TO_FSB(mp, mp->m_super->s_maxbytes));
}
xfs_extlen_t
xfs_eof_alignment(
struct xfs_inode *ip,
@ -172,8 +183,8 @@ xfs_iomap_write_direct(
int nmaps)
{
xfs_mount_t *mp = ip->i_mount;
xfs_fileoff_t offset_fsb;
xfs_fileoff_t last_fsb;
xfs_fileoff_t offset_fsb = XFS_B_TO_FSBT(mp, offset);
xfs_fileoff_t last_fsb = xfs_iomap_end_fsb(mp, offset, count);
xfs_filblks_t count_fsb, resaligned;
xfs_extlen_t extsz;
int nimaps;
@ -192,8 +203,6 @@ xfs_iomap_write_direct(
ASSERT(xfs_isilocked(ip, lockmode));
offset_fsb = XFS_B_TO_FSBT(mp, offset);
last_fsb = XFS_B_TO_FSB(mp, ((xfs_ufsize_t)(offset + count)));
if ((offset + count) > XFS_ISIZE(ip)) {
/*
* Assert that the in-core extent list is present since this can
@ -533,9 +542,7 @@ xfs_file_iomap_begin_delay(
struct xfs_inode *ip = XFS_I(inode);
struct xfs_mount *mp = ip->i_mount;
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;
xfs_fileoff_t end_fsb = xfs_iomap_end_fsb(mp, offset, count);
struct xfs_bmbt_irec imap, cmap;
struct xfs_iext_cursor icur, ccur;
xfs_fsblock_t prealloc_blocks = 0;
@ -565,8 +572,6 @@ xfs_file_iomap_begin_delay(
goto out_unlock;
}
end_fsb = min(XFS_B_TO_FSB(mp, offset + count), maxbytes_fsb);
/*
* Search the data fork fork first to look up our source mapping. We
* always need the data fork map, as we have to return it to the
@ -648,7 +653,7 @@ xfs_file_iomap_begin_delay(
* the lower level functions are updated.
*/
count = min_t(loff_t, count, 1024 * PAGE_SIZE);
end_fsb = min(XFS_B_TO_FSB(mp, offset + count), maxbytes_fsb);
end_fsb = xfs_iomap_end_fsb(mp, offset, count);
if (xfs_is_always_cow_inode(ip))
whichfork = XFS_COW_FORK;
@ -674,7 +679,8 @@ xfs_file_iomap_begin_delay(
if (align)
p_end_fsb = roundup_64(p_end_fsb, align);
p_end_fsb = min(p_end_fsb, maxbytes_fsb);
p_end_fsb = min(p_end_fsb,
XFS_B_TO_FSB(mp, mp->m_super->s_maxbytes));
ASSERT(p_end_fsb > offset_fsb);
prealloc_blocks = p_end_fsb - end_fsb;
}
@ -937,7 +943,8 @@ xfs_file_iomap_begin(
struct xfs_inode *ip = XFS_I(inode);
struct xfs_mount *mp = ip->i_mount;
struct xfs_bmbt_irec imap, cmap;
xfs_fileoff_t offset_fsb, end_fsb;
xfs_fileoff_t offset_fsb = XFS_B_TO_FSBT(mp, offset);
xfs_fileoff_t end_fsb = xfs_iomap_end_fsb(mp, offset, length);
int nimaps = 1, error = 0;
bool shared = false;
u16 iomap_flags = 0;
@ -963,12 +970,6 @@ xfs_file_iomap_begin(
if (error)
return error;
ASSERT(offset <= mp->m_super->s_maxbytes);
if (offset > mp->m_super->s_maxbytes - length)
length = mp->m_super->s_maxbytes - offset;
offset_fsb = XFS_B_TO_FSBT(mp, offset);
end_fsb = XFS_B_TO_FSB(mp, offset + length);
error = xfs_bmapi_read(ip, offset_fsb, end_fsb - offset_fsb, &imap,
&nimaps, 0);
if (error)
@ -1196,8 +1197,7 @@ xfs_seek_iomap_begin(
/*
* Fake a hole until the end of the file.
*/
data_fsb = min(XFS_B_TO_FSB(mp, offset + length),
XFS_B_TO_FSB(mp, mp->m_super->s_maxbytes));
data_fsb = xfs_iomap_end_fsb(mp, offset, length);
}
/*