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| author | Mateusz Guzik <mjguzik@gmail.com> | 2024-06-27 18:11:52 +0200 |
|---|---|---|
| committer | Christian Brauner <brauner@kernel.org> | 2024-06-27 18:34:21 +0200 |
| commit | f378ec4eec8b7e607dbc0112913fd3d5d84eb1b8 (patch) | |
| tree | 45570ee52d656a075d9b8b1ee2b2379f58e49648 /fs/dcache.c | |
| parent | 0ef625bba6fb2bc0c8ed2aab9524fdf423f67dd5 (diff) | |
| download | linux-f378ec4eec8b7e607dbc0112913fd3d5d84eb1b8.tar.gz linux-f378ec4eec8b7e607dbc0112913fd3d5d84eb1b8.tar.bz2 linux-f378ec4eec8b7e607dbc0112913fd3d5d84eb1b8.zip | |
vfs: rename parent_ino to d_parent_ino and make it use RCU
The routine is used by procfs through dir_emit_dots.
The combined RCU and lock fallback implementation is too big for an
inline. Given that the routine takes a dentry argument fs/dcache.c seems
like the place to put it in.
Signed-off-by: Mateusz Guzik <mjguzik@gmail.com>
Link: https://lore.kernel.org/r/20240627161152.802567-1-mjguzik@gmail.com
Signed-off-by: Christian Brauner <brauner@kernel.org>
Diffstat (limited to 'fs/dcache.c')
| -rw-r--r-- | fs/dcache.c | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/fs/dcache.c b/fs/dcache.c index 58b89c9e9b0c..68e843e78337 100644 --- a/fs/dcache.c +++ b/fs/dcache.c @@ -3099,6 +3099,34 @@ void d_tmpfile(struct file *file, struct inode *inode) } EXPORT_SYMBOL(d_tmpfile); +/* + * Obtain inode number of the parent dentry. + */ +ino_t d_parent_ino(struct dentry *dentry) +{ + struct dentry *parent; + struct inode *iparent; + unsigned seq; + ino_t ret; + + scoped_guard(rcu) { + seq = raw_seqcount_begin(&dentry->d_seq); + parent = READ_ONCE(dentry->d_parent); + iparent = d_inode_rcu(parent); + if (likely(iparent)) { + ret = iparent->i_ino; + if (!read_seqcount_retry(&dentry->d_seq, seq)) + return ret; + } + } + + spin_lock(&dentry->d_lock); + ret = dentry->d_parent->d_inode->i_ino; + spin_unlock(&dentry->d_lock); + return ret; +} +EXPORT_SYMBOL(d_parent_ino); + static __initdata unsigned long dhash_entries; static int __init set_dhash_entries(char *str) { |