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fs/ntfs3: Optimize large writes into sparse file

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Optimized cluster allocation by allocating a large chunk in advance
before writing, instead of allocating during the writing process
by clusters.
Essentially replicates the logic of fallocate.

Fixes: 4342306f0f ("fs/ntfs3: Add file operations and implementation")
Signed-off-by: Konstantin Komarov <almaz.alexandrovich@paragon-software.com>
This commit is contained in:
Konstantin Komarov 2024-06-28 18:27:46 +03:00
parent 2db86f7995
commit acdbd67bf9
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1 changed files with 36 additions and 0 deletions
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36
fs/ntfs3/file.c
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@ -408,6 +408,42 @@ static int ntfs_extend(struct inode *inode, loff_t pos, size_t count,
err = 0;
}
if (file && is_sparsed(ni)) {
/*
* This code optimizes large writes to sparse file.
* TODO: merge this fragment with fallocate fragment.
*/
struct ntfs_sb_info *sbi = ni->mi.sbi;
CLST vcn = pos >> sbi->cluster_bits;
CLST cend = bytes_to_cluster(sbi, end);
CLST cend_v = bytes_to_cluster(sbi, ni->i_valid);
CLST lcn, clen;
bool new;
if (cend_v > cend)
cend_v = cend;
/*
* Allocate and zero new clusters.
* Zeroing these clusters may be too long.
*/
for (; vcn < cend_v; vcn += clen) {
err = attr_data_get_block(ni, vcn, cend_v - vcn, &lcn,
&clen, &new, true);
if (err)
goto out;
}
/*
* Allocate but not zero new clusters.
*/
for (; vcn < cend; vcn += clen) {
err = attr_data_get_block(ni, vcn, cend - vcn, &lcn,
&clen, &new, false);
if (err)
goto out;
}
}
inode_set_mtime_to_ts(inode, inode_set_ctime_current(inode));
mark_inode_dirty(inode);