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fuse fixes for 6.1-rc4

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Merge tag 'fuse-fixes-6.1-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/fuse

Pull fuse fixes from Miklos Szeredi:
 "Fix two rarely triggered but long-standing issues"

* tag 'fuse-fixes-6.1-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/fuse:
  fuse: add file_modified() to fallocate
  fuse: fix readdir cache race
This commit is contained in:
Linus Torvalds 2022-11-03 13:41:29 -07:00
parent f2f32f8af2 4a6f278d48
commit 7f7bac08d9
2 changed files with 13 additions and 1 deletions
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4
fs/fuse/file.c
View file

@ -3001,6 +3001,10 @@ static long fuse_file_fallocate(struct file *file, int mode, loff_t offset,
goto out;
}
err = file_modified(file);
if (err)
goto out;
if (!(mode & FALLOC_FL_KEEP_SIZE))
set_bit(FUSE_I_SIZE_UNSTABLE, &fi->state);

10
fs/fuse/readdir.c
View file

@ -77,8 +77,10 @@ static void fuse_add_dirent_to_cache(struct file *file,
goto unlock;
addr = kmap_local_page(page);
if (!offset)
if (!offset) {
clear_page(addr);
SetPageUptodate(page);
}
memcpy(addr + offset, dirent, reclen);
kunmap_local(addr);
fi->rdc.size = (index << PAGE_SHIFT) + offset + reclen;
@ -516,6 +518,12 @@ static int fuse_readdir_cached(struct file *file, struct dir_context *ctx)
page = find_get_page_flags(file->f_mapping, index,
FGP_ACCESSED | FGP_LOCK);
/* Page gone missing, then re-added to cache, but not initialized? */
if (page && !PageUptodate(page)) {
unlock_page(page);
put_page(page);
page = NULL;
}
spin_lock(&fi->rdc.lock);
if (!page) {
/*