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| author | Ian Kent | 2019-04-11 06:28:02 +0200 |
|---|---|---|
| committer | Al Viro | 2019-06-27 02:28:15 +0200 |
| commit | 8811249f0cfdd6552152173f881fddc7f20f427e (patch) | |
| tree | a3aa302dc3be4f29b00bdce3b4b3caed61d5a40b /Documentation/filesystems | |
| parent | Linux 5.2-rc1 (diff) | |
| download | kernel-qcow2-linux-8811249f0cfdd6552152173f881fddc7f20f427e.tar.gz kernel-qcow2-linux-8811249f0cfdd6552152173f881fddc7f20f427e.tar.xz kernel-qcow2-linux-8811249f0cfdd6552152173f881fddc7f20f427e.zip | |
vfs: update d_make_root() description
Clearify d_make_root() usage, error handling and cleanup
requirements.
Signed-off-by: Ian Kent <raven@themaw.net>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'Documentation/filesystems')
| -rw-r--r-- | Documentation/filesystems/porting | 15 |
1 files changed, 13 insertions, 2 deletions
diff --git a/Documentation/filesystems/porting b/Documentation/filesystems/porting index 3bd1148d8bb6..f6714f7e6bb5 100644 --- a/Documentation/filesystems/porting +++ b/Documentation/filesystems/porting @@ -428,8 +428,19 @@ release it yourself. -- [mandatory] d_alloc_root() is gone, along with a lot of bugs caused by code -misusing it. Replacement: d_make_root(inode). The difference is, -d_make_root() drops the reference to inode if dentry allocation fails. +misusing it. Replacement: d_make_root(inode). On success d_make_root(inode) +allocates and returns a new dentry instantiated with the passed in inode. +On failure NULL is returned and the passed in inode is dropped so the reference +to inode is consumed in all cases and failure handling need not do any cleanup +for the inode. If d_make_root(inode) is passed a NULL inode it returns NULL +and also requires no further error handling. Typical usage is: + + inode = foofs_new_inode(....); + s->s_root = d_make_inode(inode); + if (!s->s_root) + /* Nothing needed for the inode cleanup */ + return -ENOMEM; + ... -- [mandatory] |