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author | Chao Yu <chao2.yu@samsung.com> | 2015-07-14 18:14:06 +0800 |
---|---|---|
committer | Jaegeuk Kim <jaegeuk@kernel.org> | 2015-08-05 08:08:23 -0700 |
commit | 470f00e9686f0b338a457568229fe7b7d44b8e6a (patch) | |
tree | e3ada22625da1d2e1dffcc9c78c8ee764e0bad18 /fs | |
parent | 7a04f64d4d5367ade827d75388d66054b535e201 (diff) | |
download | op-kernel-dev-470f00e9686f0b338a457568229fe7b7d44b8e6a.zip op-kernel-dev-470f00e9686f0b338a457568229fe7b7d44b8e6a.tar.gz |
f2fs: fix to release inode page correctly
In following call path, we will pass a locked and referenced ipage
pointer to get_new_data_page:
- init_inode_metadata
- make_empty_dir
- get_new_data_page
There are two exit paths in get_new_data_page when error occurs:
1) grab_cache_page fails, ipage will not be released;
2) f2fs_reserve_block fails, ipage will be released in callee.
So, it's not consistent for error handling in get_new_data_page.
For f2fs_reserve_block, it's not very easy to change the rule
of error handling, since it's already complicated.
Here we deside to choose an easy way to fix this issue:
If any error occur in get_new_data_page, we will ensure releasing
ipage in this function.
The same issue is in f2fs_convert_inline_dir, fix that too.
Signed-off-by: Chao Yu <chao2.yu@samsung.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Diffstat (limited to 'fs')
-rw-r--r-- | fs/f2fs/data.c | 11 | ||||
-rw-r--r-- | fs/f2fs/inline.c | 13 |
2 files changed, 19 insertions, 5 deletions
diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c index 2692848e..f8f93db 100644 --- a/fs/f2fs/data.c +++ b/fs/f2fs/data.c @@ -388,7 +388,8 @@ repeat: * * Also, caller should grab and release a rwsem by calling f2fs_lock_op() and * f2fs_unlock_op(). - * Note that, ipage is set only by make_empty_dir. + * Note that, ipage is set only by make_empty_dir, and if any error occur, + * ipage should be released by this function. */ struct page *get_new_data_page(struct inode *inode, struct page *ipage, pgoff_t index, bool new_i_size) @@ -399,8 +400,14 @@ struct page *get_new_data_page(struct inode *inode, int err; repeat: page = grab_cache_page(mapping, index); - if (!page) + if (!page) { + /* + * before exiting, we should make sure ipage will be released + * if any error occur. + */ + f2fs_put_page(ipage, 1); return ERR_PTR(-ENOMEM); + } set_new_dnode(&dn, inode, ipage, NULL, 0); err = f2fs_reserve_block(&dn, index); diff --git a/fs/f2fs/inline.c b/fs/f2fs/inline.c index a13ffcc..79d18d5 100644 --- a/fs/f2fs/inline.c +++ b/fs/f2fs/inline.c @@ -360,6 +360,10 @@ int make_empty_inline_dir(struct inode *inode, struct inode *parent, return 0; } +/* + * NOTE: ipage is grabbed by caller, but if any error occurs, we should + * release ipage in this function. + */ static int f2fs_convert_inline_dir(struct inode *dir, struct page *ipage, struct f2fs_inline_dentry *inline_dentry) { @@ -369,8 +373,10 @@ static int f2fs_convert_inline_dir(struct inode *dir, struct page *ipage, int err; page = grab_cache_page(dir->i_mapping, 0); - if (!page) + if (!page) { + f2fs_put_page(ipage, 1); return -ENOMEM; + } set_new_dnode(&dn, dir, ipage, NULL, 0); err = f2fs_reserve_block(&dn, 0); @@ -434,8 +440,9 @@ int f2fs_add_inline_entry(struct inode *dir, const struct qstr *name, slots, NR_INLINE_DENTRY); if (bit_pos >= NR_INLINE_DENTRY) { err = f2fs_convert_inline_dir(dir, ipage, dentry_blk); - if (!err) - err = -EAGAIN; + if (err) + return err; + err = -EAGAIN; goto out; } |