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shmem: convert shmem_symlink() to use a folio 

While symlinks will always be < PAGE_SIZE, using the folio APIs gets rid
of unnecessary calls to compound_head().

Link: https://lkml.kernel.org/r/20220902194653.1739778-30-willy@infradead.org
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Matthew Wilcox (Oracle) 2022-09-02 20:46:25 +01:00 committed by Andrew Morton
parent b0802b22a9
commit 7ad0414bde
1 changed files with 7 additions and 7 deletions
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14
mm/shmem.c
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@ -3093,7 +3093,7 @@ static int shmem_symlink(struct user_namespace *mnt_userns, struct inode *dir,
int error;
int len;
struct inode *inode;
struct page *page;
struct folio *folio;
len = strlen(symname) + 1;
if (len > PAGE_SIZE)
@ -3121,18 +3121,18 @@ static int shmem_symlink(struct user_namespace *mnt_userns, struct inode *dir,
inode->i_op = &shmem_short_symlink_operations;
} else {
inode_nohighmem(inode);
error = shmem_getpage(inode, 0, &page, SGP_WRITE);
error = shmem_get_folio(inode, 0, &folio, SGP_WRITE);
if (error) {
iput(inode);
return error;
}
inode->i_mapping->a_ops = &shmem_aops;
inode->i_op = &shmem_symlink_inode_operations;
memcpy(page_address(page), symname, len);
SetPageUptodate(page);
set_page_dirty(page);
unlock_page(page);
put_page(page);
memcpy(folio_address(folio), symname, len);
folio_mark_uptodate(folio);
folio_mark_dirty(folio);
folio_unlock(folio);
folio_put(folio);
}
dir->i_size += BOGO_DIRENT_SIZE;
dir->i_ctime = dir->i_mtime = current_time(dir);