fsnotify: pass a file instead of an inode to open, read, and write

fanotify, the upcoming notification system actually needs a struct path so it can
do opens in the context of listeners, and it needs a file so it can get f_flags
from the original process.  Close was the only operation that already was passing
a struct file to the notification hook.  This patch passes a file for access,
modify, and open as well as they are easily available to these hooks.

Signed-off-by: Eric Paris <eparis@redhat.com>

6 files changed, 20 insertions, 18 deletions

diff --git a/fs/compat.c b/fs/compat.c
index 6490d2134ff3..ce02278b9c83 100644
--- a/fs/compat.c
+++ b/fs/compat.c
@@ -1193,11 +1193,10 @@ out:
         if (iov != iovstack)
                 kfree(iov);
         if ((ret + (type == READ)) > 0) {
-                struct dentry *dentry = file->f_path.dentry;
                 if (type == READ)
-                        fsnotify_access(dentry);
+                        fsnotify_access(file);
                 else
-                        fsnotify_modify(dentry);
+                        fsnotify_modify(file);
         }
         return ret;
 }
diff --git a/fs/exec.c b/fs/exec.c
index e19de6a80339..f2de04a01a2a 100644
--- a/fs/exec.c
+++ b/fs/exec.c
@@ -129,7 +129,7 @@ SYSCALL_DEFINE1(uselib, const char __user *, library)
         if (file->f_path.mnt->mnt_flags & MNT_NOEXEC)
                 goto exit;
 
-        fsnotify_open(file->f_path.dentry);
+        fsnotify_open(file);
 
         error = -ENOEXEC;
         if(file->f_op) {
@@ -683,7 +683,7 @@ struct file *open_exec(const char *name)
         if (file->f_path.mnt->mnt_flags & MNT_NOEXEC)
                 goto exit;
 
-        fsnotify_open(file->f_path.dentry);
+        fsnotify_open(file);
 
         err = deny_write_access(file);
         if (err)
diff --git a/fs/nfsd/vfs.c b/fs/nfsd/vfs.c
index 3c111120b619..16114a8e79d4 100644
--- a/fs/nfsd/vfs.c
+++ b/fs/nfsd/vfs.c
@@ -951,7 +951,7 @@ nfsd_vfs_read(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file,
                 nfsdstats.io_read += host_err;
                 *count = host_err;
                 err = 0;
-                fsnotify_access(file->f_path.dentry);
+                fsnotify_access(file);
         } else 
                 err = nfserrno(host_err);
 out:
@@ -1062,7 +1062,7 @@ nfsd_vfs_write(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file,
                 goto out_nfserr;
         *cnt = host_err;
         nfsdstats.io_write += host_err;
-        fsnotify_modify(file->f_path.dentry);
+        fsnotify_modify(file);
 
         /* clear setuid/setgid flag after write */
         if (inode->i_mode & (S_ISUID | S_ISGID))
diff --git a/fs/open.c b/fs/open.c
index 94d54d3efa8b..bf082635e257 100644
--- a/fs/open.c
+++ b/fs/open.c
@@ -889,7 +889,7 @@ long do_sys_open(int dfd, const char __user *filename, int flags, int mode)
                                 put_unused_fd(fd);
                                 fd = PTR_ERR(f);
                         } else {
-                                fsnotify_open(f->f_path.dentry);
+                                fsnotify_open(f);
                                 fd_install(fd, f);
                         }
                 }
diff --git a/fs/read_write.c b/fs/read_write.c
index 9c0485236e68..74e36586e4d3 100644
--- a/fs/read_write.c
+++ b/fs/read_write.c
@@ -311,7 +311,7 @@ ssize_t vfs_read(struct file *file, char __user *buf, size_t count, loff_t *pos)
                 else
                         ret = do_sync_read(file, buf, count, pos);
                 if (ret > 0) {
-                        fsnotify_access(file->f_path.dentry);
+                        fsnotify_access(file);
                         add_rchar(current, ret);
                 }
                 inc_syscr(current);
@@ -367,7 +367,7 @@ ssize_t vfs_write(struct file *file, const char __user *buf, size_t count, loff_
                 else
                         ret = do_sync_write(file, buf, count, pos);
                 if (ret > 0) {
-                        fsnotify_modify(file->f_path.dentry);
+                        fsnotify_modify(file);
                         add_wchar(current, ret);
                 }
                 inc_syscw(current);
@@ -675,9 +675,9 @@ out:
                 kfree(iov);
         if ((ret + (type == READ)) > 0) {
                 if (type == READ)
-                        fsnotify_access(file->f_path.dentry);
+                        fsnotify_access(file);
                 else
-                        fsnotify_modify(file->f_path.dentry);
+                        fsnotify_modify(file);
         }
         return ret;
 }
diff --git a/include/linux/fsnotify.h b/include/linux/fsnotify.h
index f958e93feb97..845e57abfb86 100644
--- a/include/linux/fsnotify.h
+++ b/include/linux/fsnotify.h
@@ -153,8 +153,9 @@ static inline void fsnotify_mkdir(struct inode *inode, struct dentry *dentry)
 /*
  * fsnotify_access - file was read
  */
-static inline void fsnotify_access(struct dentry *dentry)
+static inline void fsnotify_access(struct file *file)
 {
+        struct dentry *dentry = file->f_path.dentry;
         struct inode *inode = dentry->d_inode;
         __u32 mask = FS_ACCESS;
 
@@ -162,14 +163,15 @@ static inline void fsnotify_access(struct dentry *dentry)
                 mask |= FS_IN_ISDIR;
 
         fsnotify_parent(dentry, mask);
-        fsnotify(inode, mask, inode, FSNOTIFY_EVENT_INODE, NULL, 0);
+        fsnotify(inode, mask, file, FSNOTIFY_EVENT_FILE, NULL, 0);
 }
 
 /*
  * fsnotify_modify - file was modified
  */
-static inline void fsnotify_modify(struct dentry *dentry)
+static inline void fsnotify_modify(struct file *file)
 {
+        struct dentry *dentry = file->f_path.dentry;
         struct inode *inode = dentry->d_inode;
         __u32 mask = FS_MODIFY;
 
@@ -177,14 +179,15 @@ static inline void fsnotify_modify(struct dentry *dentry)
                 mask |= FS_IN_ISDIR;
 
         fsnotify_parent(dentry, mask);
-        fsnotify(inode, mask, inode, FSNOTIFY_EVENT_INODE, NULL, 0);
+        fsnotify(inode, mask, file, FSNOTIFY_EVENT_FILE, NULL, 0);
 }
 
 /*
  * fsnotify_open - file was opened
  */
-static inline void fsnotify_open(struct dentry *dentry)
+static inline void fsnotify_open(struct file *file)
 {
+        struct dentry *dentry = file->f_path.dentry;
         struct inode *inode = dentry->d_inode;
         __u32 mask = FS_OPEN;
 
@@ -192,7 +195,7 @@ static inline void fsnotify_open(struct dentry *dentry)
                 mask |= FS_IN_ISDIR;
 
         fsnotify_parent(dentry, mask);
-        fsnotify(inode, mask, inode, FSNOTIFY_EVENT_INODE, NULL, 0);
+        fsnotify(inode, mask, file, FSNOTIFY_EVENT_FILE, NULL, 0);
 }
 
 /*