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| author | Nick Piggin <npiggin@kernel.dk> | 2011-01-07 17:49:57 +1100 |
|---|---|---|
| committer | Nick Piggin <npiggin@kernel.dk> | 2011-01-07 17:50:29 +1100 |
| commit | 34286d6662308d82aed891852d04c7c3a2649b16 (patch) | |
| tree | c4b7311404d302e7cb94df7a4690298e1059910a /drivers | |
| parent | 44a7d7a878c9cbb74f236ea755b25b6b2e26a9a9 (diff) | |
| download | linux-stable-34286d6662308d82aed891852d04c7c3a2649b16.tar.gz linux-stable-34286d6662308d82aed891852d04c7c3a2649b16.tar.bz2 linux-stable-34286d6662308d82aed891852d04c7c3a2649b16.zip | |
fs: rcu-walk aware d_revalidate method
Require filesystems be aware of .d_revalidate being called in rcu-walk
mode (nd->flags & LOOKUP_RCU). For now do a simple push down, returning
-ECHILD from all implementations.
Signed-off-by: Nick Piggin <npiggin@kernel.dk>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/staging/autofs/root.c | 5 | ||||
| -rw-r--r-- | drivers/staging/smbfs/dir.c | 16 |
2 files changed, 16 insertions, 5 deletions
diff --git a/drivers/staging/autofs/root.c b/drivers/staging/autofs/root.c index b09adb57971f..bf0e9755da67 100644 --- a/drivers/staging/autofs/root.c +++ b/drivers/staging/autofs/root.c @@ -154,13 +154,16 @@ static int try_to_fill_dentry(struct dentry *dentry, struct super_block *sb, str * yet completely filled in, and revalidate has to delay such * lookups.. */ -static int autofs_revalidate(struct dentry * dentry, struct nameidata *nd) +static int autofs_revalidate(struct dentry *dentry, struct nameidata *nd) { struct inode * dir; struct autofs_sb_info *sbi; struct autofs_dir_ent *ent; int res; + if (nd->flags & LOOKUP_RCU) + return -ECHILD; + lock_kernel(); dir = dentry->d_parent->d_inode; sbi = autofs_sbi(dir->i_sb); diff --git a/drivers/staging/smbfs/dir.c b/drivers/staging/smbfs/dir.c index 78f09412740c..dd612f50749f 100644 --- a/drivers/staging/smbfs/dir.c +++ b/drivers/staging/smbfs/dir.c @@ -14,6 +14,7 @@ #include <linux/ctype.h> #include <linux/net.h> #include <linux/sched.h> +#include <linux/namei.h> #include "smb_fs.h" #include "smb_mount.h" @@ -301,13 +302,20 @@ static const struct dentry_operations smbfs_dentry_operations_case = * This is the callback when the dcache has a lookup hit. */ static int -smb_lookup_validate(struct dentry * dentry, struct nameidata *nd) +smb_lookup_validate(struct dentry *dentry, struct nameidata *nd) { - struct smb_sb_info *server = server_from_dentry(dentry); - struct inode * inode = dentry->d_inode; - unsigned long age = jiffies - dentry->d_time; + struct smb_sb_info *server; + struct inode *inode; + unsigned long age; int valid; + if (nd->flags & LOOKUP_RCU) + return -ECHILD; + + server = server_from_dentry(dentry); + inode = dentry->d_inode; + age = jiffies - dentry->d_time; + /* * The default validation is based on dentry age: * we believe in dentries for a few seconds. (But each |