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erofs: use inode_set_cached_link()

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Symlink lengths are now cached in in-memory inodes directly so that
readlink can be sped up.

Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>
This commit is contained in:
Gao Xiang 2026-02-03 10:31:00 +08:00
parent 1729f7c675
commit 72558e2bed
1 changed files with 20 additions and 12 deletions
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32
fs/erofs/inode.c
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@ -8,21 +8,29 @@
#include <linux/compat.h>
#include <trace/events/erofs.h>
static int erofs_fill_symlink(struct inode *inode, void *kaddr,
unsigned int m_pofs)
static int erofs_fill_symlink(struct inode *inode, void *bptr, unsigned int ofs)
{
struct erofs_inode *vi = EROFS_I(inode);
loff_t off;
char *link;
loff_t end;
m_pofs += vi->xattr_isize;
/* check if it cannot be handled with fast symlink scheme */
if (vi->datalayout != EROFS_INODE_FLAT_INLINE ||
check_add_overflow(m_pofs, inode->i_size, &off) ||
off > i_blocksize(inode))
return 0;
inode->i_link = kmemdup_nul(kaddr + m_pofs, inode->i_size, GFP_KERNEL);
return inode->i_link ? 0 : -ENOMEM;
ofs += vi->xattr_isize;
/* check whether the symlink data is small enough to be inlined */
if (vi->datalayout == EROFS_INODE_FLAT_INLINE &&
!check_add_overflow(ofs, inode->i_size, &end) &&
end <= i_blocksize(inode)) {
link = kmemdup_nul(bptr + ofs, inode->i_size, GFP_KERNEL);
if (!link)
return -ENOMEM;
if (unlikely(!inode->i_size || strlen(link) != inode->i_size)) {
erofs_err(inode->i_sb, "invalid fast symlink size %llu @ nid %llu",
inode->i_size | 0ULL, vi->nid);
kfree(link);
return -EFSCORRUPTED;
}
inode_set_cached_link(inode, link, inode->i_size);
}
return 0;
}
static int erofs_read_inode(struct inode *inode)