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authorMiklos Szeredi <miklos@szeredi.hu>2005-11-07 00:59:49 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2005-11-07 07:53:42 -0800
commitcc4e69dee4a080f6eae3f410daec2593f4fa6f00 (patch)
treeb9be8984a0be5f7997d836603963dcf8f2e728ff
parent481bed454247538e9f57d4ea37b153ccba24ba7b (diff)
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[PATCH] VFS: pass file pointer to filesystem from ftruncate()
This patch extends the iattr structure with a file pointer memeber, and adds an ATTR_FILE validity flag for this member. This is set if do_truncate() is invoked from ftruncate() or from do_coredump(). The change is source and binary compatible. Signed-off-by: Miklos Szeredi <miklos@szeredi.hu> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
-rw-r--r--fs/exec.c2
-rw-r--r--fs/namei.c2
-rw-r--r--fs/open.c10
-rw-r--r--include/linux/fs.h10
4 files changed, 18 insertions, 6 deletions
diff --git a/fs/exec.c b/fs/exec.c
index ce76b33f25a..cd6c574557d 100644
--- a/fs/exec.c
+++ b/fs/exec.c
@@ -1511,7 +1511,7 @@ int do_coredump(long signr, int exit_code, struct pt_regs * regs)
goto close_fail;
if (!file->f_op->write)
goto close_fail;
- if (do_truncate(file->f_dentry, 0) != 0)
+ if (do_truncate(file->f_dentry, 0, file) != 0)
goto close_fail;
retval = binfmt->core_dump(signr, regs, file);
diff --git a/fs/namei.c b/fs/namei.c
index c5769c4fcab..b3f8a1966c9 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -1459,7 +1459,7 @@ int may_open(struct nameidata *nd, int acc_mode, int flag)
if (!error) {
DQUOT_INIT(inode);
- error = do_truncate(dentry, 0);
+ error = do_truncate(dentry, 0, NULL);
}
put_write_access(inode);
if (error)
diff --git a/fs/open.c b/fs/open.c
index 2835f096c68..6e8136751e9 100644
--- a/fs/open.c
+++ b/fs/open.c
@@ -194,7 +194,7 @@ out:
return error;
}
-int do_truncate(struct dentry *dentry, loff_t length)
+int do_truncate(struct dentry *dentry, loff_t length, struct file *filp)
{
int err;
struct iattr newattrs;
@@ -205,6 +205,10 @@ int do_truncate(struct dentry *dentry, loff_t length)
newattrs.ia_size = length;
newattrs.ia_valid = ATTR_SIZE | ATTR_CTIME;
+ if (filp) {
+ newattrs.ia_file = filp;
+ newattrs.ia_valid |= ATTR_FILE;
+ }
down(&dentry->d_inode->i_sem);
err = notify_change(dentry, &newattrs);
@@ -262,7 +266,7 @@ static inline long do_sys_truncate(const char __user * path, loff_t length)
error = locks_verify_truncate(inode, NULL, length);
if (!error) {
DQUOT_INIT(inode);
- error = do_truncate(nd.dentry, length);
+ error = do_truncate(nd.dentry, length, NULL);
}
put_write_access(inode);
@@ -314,7 +318,7 @@ static inline long do_sys_ftruncate(unsigned int fd, loff_t length, int small)
error = locks_verify_truncate(inode, file, length);
if (!error)
- error = do_truncate(dentry, length);
+ error = do_truncate(dentry, length, file);
out_putf:
fput(file);
out:
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 6d6226732c9..0c89fc9481a 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -264,6 +264,7 @@ typedef void (dio_iodone_t)(struct kiocb *iocb, loff_t offset,
#define ATTR_ATTR_FLAG 1024
#define ATTR_KILL_SUID 2048
#define ATTR_KILL_SGID 4096
+#define ATTR_FILE 8192
/*
* This is the Inode Attributes structure, used for notify_change(). It
@@ -283,6 +284,13 @@ struct iattr {
struct timespec ia_atime;
struct timespec ia_mtime;
struct timespec ia_ctime;
+
+ /*
+ * Not an attribute, but an auxilary info for filesystems wanting to
+ * implement an ftruncate() like method. NOTE: filesystem should
+ * check for (ia_valid & ATTR_FILE), and not for (ia_file != NULL).
+ */
+ struct file *ia_file;
};
/*
@@ -1288,7 +1296,7 @@ static inline int break_lease(struct inode *inode, unsigned int mode)
/* fs/open.c */
-extern int do_truncate(struct dentry *, loff_t start);
+extern int do_truncate(struct dentry *, loff_t start, struct file *filp);
extern long do_sys_open(const char __user *filename, int flags, int mode);
extern struct file *filp_open(const char *, int, int);
extern struct file * dentry_open(struct dentry *, struct vfsmount *, int);