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ubifs: read-only if LEB may always be taken in ubifs_garbage_collect 

If ubifs_garbage_collect_leb() returns -EAGAIN and ubifs_return_leb
returns error, a LEB will always has a "taken" flag. In this case,
set the ubifs to read-only to prevent a worse situation.

Signed-off-by: Baokun Li <libaokun1@huawei.com>
Signed-off-by: Richard Weinberger <richard@nod.at>
This commit is contained in:
Baokun Li 2021-11-15 09:31:44 +08:00 committed by Richard Weinberger
parent 0d76502172
commit 50cb437325
1 changed files with 10 additions and 1 deletions
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11
fs/ubifs/gc.c
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@ -756,8 +756,17 @@ int ubifs_garbage_collect(struct ubifs_info *c, int anyway)
* caller instead of the original '-EAGAIN'. * caller instead of the original '-EAGAIN'.
*/ */
err = ubifs_return_leb(c, lp.lnum); err = ubifs_return_leb(c, lp.lnum);
if (err) if (err) {
ret = err; ret = err;
/*
* An LEB may always be "taken",
* so setting ubifs to read-only,
* and then executing sync wbuf will
* return -EROFS and enter the "out"
* error branch.
*/
ubifs_ro_mode(c, ret);
}
/* Maybe double return LEB if goto out */ /* Maybe double return LEB if goto out */
lp.lnum = -1; lp.lnum = -1;
break; break;