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[PATCH] Honour AOP_TRUNCATE_PAGE returns in page_symlink

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As prepare_write, commit_write and readpage are allowed to return
AOP_TRUNCATE_PAGE, page_symlink should respond to them.

Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
NeilBrown 2006-03-25 03:07:57 -08:00 committed by Linus Torvalds
parent 341546f5ad
commit 7e53cac41d
1 changed files with 14 additions and 2 deletions
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16
fs/namei.c
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@ -2627,16 +2627,27 @@ int __page_symlink(struct inode *inode, const char *symname, int len,
int err = -ENOMEM;
char *kaddr;
retry:
page = find_or_create_page(mapping, 0, gfp_mask);
if (!page)
goto fail;
err = mapping->a_ops->prepare_write(NULL, page, 0, len-1);
if (err == AOP_TRUNCATED_PAGE) {
page_cache_release(page);
goto retry;
}
if (err)
goto fail_map;
kaddr = kmap_atomic(page, KM_USER0);
memcpy(kaddr, symname, len-1);
kunmap_atomic(kaddr, KM_USER0);
mapping->a_ops->commit_write(NULL, page, 0, len-1);
err = mapping->a_ops->commit_write(NULL, page, 0, len-1);
if (err == AOP_TRUNCATED_PAGE) {
page_cache_release(page);
goto retry;
}
if (err)
goto fail_map;
/*
* Notice that we are _not_ going to block here - end of page is
* unmapped, so this will only try to map the rest of page, see
@ -2646,7 +2657,8 @@ int __page_symlink(struct inode *inode, const char *symname, int len,
*/
if (!PageUptodate(page)) {
err = mapping->a_ops->readpage(NULL, page);
wait_on_page_locked(page);
if (err != AOP_TRUNCATED_PAGE)
wait_on_page_locked(page);
} else {
unlock_page(page);
}