From fb5f51c7425ebc808d91329257cbc963e2421368 Mon Sep 17 00:00:00 2001 From: Ian Kent Date: Thu, 24 Nov 2016 08:03:41 +1100 Subject: [PATCH] vfs: change d_manage() to take a struct path For the autofs module to be able to reliably check if a dentry is a mountpoint in a multiple namespace environment the ->d_manage() dentry operation will need to take a path argument instead of a dentry. Link: http://lkml.kernel.org/r/20161011053352.27645.83962.stgit@pluto.themaw.net Signed-off-by: Ian Kent Cc: Al Viro Cc: Eric W. Biederman Cc: Omar Sandoval Signed-off-by: Andrew Morton Signed-off-by: Al Viro --- Documentation/filesystems/Locking | 2 +- Documentation/filesystems/vfs.txt | 2 +- fs/autofs4/root.c | 5 +++-- fs/namei.c | 13 ++++++------- include/linux/dcache.h | 2 +- 5 files changed, 12 insertions(+), 12 deletions(-) diff --git a/Documentation/filesystems/Locking b/Documentation/filesystems/Locking index 1b5f15653b1b..4ca3a8d1349d 100644 --- a/Documentation/filesystems/Locking +++ b/Documentation/filesystems/Locking @@ -20,7 +20,7 @@ prototypes: void (*d_iput)(struct dentry *, struct inode *); char *(*d_dname)((struct dentry *dentry, char *buffer, int buflen); struct vfsmount *(*d_automount)(struct path *path); - int (*d_manage)(struct dentry *, bool); + int (*d_manage)(const struct path *, bool); struct dentry *(*d_real)(struct dentry *, const struct inode *, unsigned int); diff --git a/Documentation/filesystems/vfs.txt b/Documentation/filesystems/vfs.txt index b5039a00caaf..3893f4d44cd4 100644 --- a/Documentation/filesystems/vfs.txt +++ b/Documentation/filesystems/vfs.txt @@ -948,7 +948,7 @@ struct dentry_operations { void (*d_iput)(struct dentry *, struct inode *); char *(*d_dname)(struct dentry *, char *, int); struct vfsmount *(*d_automount)(struct path *); - int (*d_manage)(struct dentry *, bool); + int (*d_manage)(const struct path *, bool); struct dentry *(*d_real)(struct dentry *, const struct inode *, unsigned int); }; diff --git a/fs/autofs4/root.c b/fs/autofs4/root.c index a11f73174877..3a4328218b71 100644 --- a/fs/autofs4/root.c +++ b/fs/autofs4/root.c @@ -32,7 +32,7 @@ static int autofs4_dir_open(struct inode *inode, struct file *file); static struct dentry *autofs4_lookup(struct inode *, struct dentry *, unsigned int); static struct vfsmount *autofs4_d_automount(struct path *); -static int autofs4_d_manage(struct dentry *, bool); +static int autofs4_d_manage(const struct path *, bool); static void autofs4_dentry_release(struct dentry *); const struct file_operations autofs4_root_operations = { @@ -421,8 +421,9 @@ static struct vfsmount *autofs4_d_automount(struct path *path) return NULL; } -static int autofs4_d_manage(struct dentry *dentry, bool rcu_walk) +static int autofs4_d_manage(const struct path *path, bool rcu_walk) { + struct dentry *dentry = path->dentry; struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb); struct autofs_info *ino = autofs4_dentry_ino(dentry); int status; diff --git a/fs/namei.c b/fs/namei.c index 5b4eed221530..81ac4736b596 100644 --- a/fs/namei.c +++ b/fs/namei.c @@ -1200,7 +1200,7 @@ static int follow_managed(struct path *path, struct nameidata *nd) if (managed & DCACHE_MANAGE_TRANSIT) { BUG_ON(!path->dentry->d_op); BUG_ON(!path->dentry->d_op->d_manage); - ret = path->dentry->d_op->d_manage(path->dentry, false); + ret = path->dentry->d_op->d_manage(path, false); if (ret < 0) break; } @@ -1263,10 +1263,10 @@ int follow_down_one(struct path *path) } EXPORT_SYMBOL(follow_down_one); -static inline int managed_dentry_rcu(struct dentry *dentry) +static inline int managed_dentry_rcu(const struct path *path) { - return (dentry->d_flags & DCACHE_MANAGE_TRANSIT) ? - dentry->d_op->d_manage(dentry, true) : 0; + return (path->dentry->d_flags & DCACHE_MANAGE_TRANSIT) ? + path->dentry->d_op->d_manage(path, true) : 0; } /* @@ -1282,7 +1282,7 @@ static bool __follow_mount_rcu(struct nameidata *nd, struct path *path, * Don't forget we might have a non-mountpoint managed dentry * that wants to block transit. */ - switch (managed_dentry_rcu(path->dentry)) { + switch (managed_dentry_rcu(path)) { case -ECHILD: default: return false; @@ -1392,8 +1392,7 @@ int follow_down(struct path *path) if (managed & DCACHE_MANAGE_TRANSIT) { BUG_ON(!path->dentry->d_op); BUG_ON(!path->dentry->d_op->d_manage); - ret = path->dentry->d_op->d_manage( - path->dentry, false); + ret = path->dentry->d_op->d_manage(path, false); if (ret < 0) return ret == -EISDIR ? 0 : ret; } diff --git a/include/linux/dcache.h b/include/linux/dcache.h index 5beed7b30561..bc529ce88ed0 100644 --- a/include/linux/dcache.h +++ b/include/linux/dcache.h @@ -139,7 +139,7 @@ struct dentry_operations { void (*d_iput)(struct dentry *, struct inode *); char *(*d_dname)(struct dentry *, char *, int); struct vfsmount *(*d_automount)(struct path *); - int (*d_manage)(struct dentry *, bool); + int (*d_manage)(const struct path *, bool); struct dentry *(*d_real)(struct dentry *, const struct inode *, unsigned int); } ____cacheline_aligned; -- GitLab