Messages in this thread Patch in this message | | | Subject | [PATCH 1 of 2] Stackfs: Introduce stackfs_copy_{attr,inode}_* | Date | Fri, 13 Oct 2006 07:18:49 -0400 | From | Josef "Jeff" Sipek <> |
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From: Josef "Jeff" Sipek <jsipek@cs.sunysb.edu>
The following patch introduces several stackfs_copy_* functions which allow stackable filesystems (such as eCryptfs and Unionfs) to easily copy over (currently only) inode attributes. This prevents code duplication and allows for code reuse.
Signed-off-by: Josef "Jeff" Sipek <jsipek@cs.sunysb.edu>
---
1 file changed, 65 insertions(+) include/linux/stack_fs.h | 65 ++++++++++++++++++++++++++++++++++++++++++++++
diff --git a/include/linux/stack_fs.h b/include/linux/stack_fs.h new file mode 100644 --- /dev/null +++ b/include/linux/stack_fs.h @@ -0,0 +1,65 @@ +#ifndef _LINUX_STACK_FS_H +#define _LINUX_STACK_FS_H + +/* This file defines generic functions used primarily by stackable + * filesystems + */ + +static inline void stackfs_copy_inode_size(struct inode *dst, + const struct inode *src) +{ + i_size_write(dst, i_size_read((struct inode *)src)); + dst->i_blocks = src->i_blocks; +} + +static inline void stackfs_copy_attr_atime(struct inode *dest, + const struct inode *src) +{ + dest->i_atime = src->i_atime; +} + +static inline void stackfs_copy_attr_times(struct inode *dest, + const struct inode *src) +{ + dest->i_atime = src->i_atime; + dest->i_mtime = src->i_mtime; + dest->i_ctime = src->i_ctime; +} + +static inline void stackfs_copy_attr_timesizes(struct inode *dest, + const struct inode *src) +{ + dest->i_atime = src->i_atime; + dest->i_mtime = src->i_mtime; + dest->i_ctime = src->i_ctime; + stackfs_copy_inode_size(dest, src); +} + +static inline void __stackfs_copy_attr_all(struct inode *dest, + const struct inode *src, + int (*get_nlinks)(struct inode *)) +{ + if (!get_nlinks) + dest->i_nlink = src->i_nlink; + else + dest->i_nlink = get_nlinks(dest); + + dest->i_mode = src->i_mode; + dest->i_uid = src->i_uid; + dest->i_gid = src->i_gid; + dest->i_rdev = src->i_rdev; + dest->i_atime = src->i_atime; + dest->i_mtime = src->i_mtime; + dest->i_ctime = src->i_ctime; + dest->i_blkbits = src->i_blkbits; + dest->i_flags = src->i_flags; +} + +static inline void stackfs_copy_attr_all(struct inode *dest, + const struct inode *src) +{ + __stackfs_copy_attr_all(dest, src, NULL); +} + +#endif /* _LINUX_STACK_FS_H */ +
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