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author | Al Viro <viro@zeniv.linux.org.uk> | 2015-11-17 10:20:54 -0500 |
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committer | Al Viro <viro@zeniv.linux.org.uk> | 2015-12-08 22:41:54 -0500 |
commit | 6b2553918d8b4e6de9853fd6315bec7271a2e592 (patch) | |
tree | 85540dcb0dc0de3d67c68d0aa7b17058f4e96539 /fs/proc/namespaces.c | |
parent | 21fc61c73c3903c4c312d0802da01ec2b323d174 (diff) | |
download | linux-6b2553918d8b4e6de9853fd6315bec7271a2e592.tar.bz2 |
replace ->follow_link() with new method that could stay in RCU mode
new method: ->get_link(); replacement of ->follow_link(). The differences
are:
* inode and dentry are passed separately
* might be called both in RCU and non-RCU mode;
the former is indicated by passing it a NULL dentry.
* when called that way it isn't allowed to block
and should return ERR_PTR(-ECHILD) if it needs to be called
in non-RCU mode.
It's a flagday change - the old method is gone, all in-tree instances
converted. Conversion isn't hard; said that, so far very few instances
do not immediately bail out when called in RCU mode. That'll change
in the next commits.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/proc/namespaces.c')
-rw-r--r-- | fs/proc/namespaces.c | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/fs/proc/namespaces.c b/fs/proc/namespaces.c index f6e8354b8cea..63861c15e109 100644 --- a/fs/proc/namespaces.c +++ b/fs/proc/namespaces.c @@ -30,14 +30,17 @@ static const struct proc_ns_operations *ns_entries[] = { &mntns_operations, }; -static const char *proc_ns_follow_link(struct dentry *dentry, void **cookie) +static const char *proc_ns_get_link(struct dentry *dentry, + struct inode *inode, void **cookie) { - struct inode *inode = d_inode(dentry); const struct proc_ns_operations *ns_ops = PROC_I(inode)->ns_ops; struct task_struct *task; struct path ns_path; void *error = ERR_PTR(-EACCES); + if (!dentry) + return ERR_PTR(-ECHILD); + task = get_proc_task(inode); if (!task) return error; @@ -74,7 +77,7 @@ static int proc_ns_readlink(struct dentry *dentry, char __user *buffer, int bufl static const struct inode_operations proc_ns_link_inode_operations = { .readlink = proc_ns_readlink, - .follow_link = proc_ns_follow_link, + .get_link = proc_ns_get_link, .setattr = proc_setattr, }; |