42cf11939b
Introduce several fsstack_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. [akpm@osdl.org: Remove unneeded wrapper] [bunk@stusta.de: fs/stack.c should #include <linux/fs_stack.h>] Signed-off-by: Josef "Jeff" Sipek <jsipek@cs.sunysb.edu> Cc: Michael Halcrow <mhalcrow@us.ibm.com> Signed-off-by: Adrian Bunk <bunk@stusta.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
40 lines
1.1 KiB
C
40 lines
1.1 KiB
C
#include <linux/module.h>
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#include <linux/fs.h>
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#include <linux/fs_stack.h>
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/* does _NOT_ require i_mutex to be held.
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*
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* This function cannot be inlined since i_size_{read,write} is rather
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* heavy-weight on 32-bit systems
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*/
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void fsstack_copy_inode_size(struct inode *dst, const struct inode *src)
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{
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i_size_write(dst, i_size_read((struct inode *)src));
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dst->i_blocks = src->i_blocks;
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}
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EXPORT_SYMBOL_GPL(fsstack_copy_inode_size);
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/* copy all attributes; get_nlinks is optional way to override the i_nlink
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* copying
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*/
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void fsstack_copy_attr_all(struct inode *dest, const struct inode *src,
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int (*get_nlinks)(struct inode *))
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{
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if (!get_nlinks)
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dest->i_nlink = src->i_nlink;
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else
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dest->i_nlink = (*get_nlinks)(dest);
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dest->i_mode = src->i_mode;
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dest->i_uid = src->i_uid;
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dest->i_gid = src->i_gid;
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dest->i_rdev = src->i_rdev;
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dest->i_atime = src->i_atime;
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dest->i_mtime = src->i_mtime;
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dest->i_ctime = src->i_ctime;
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dest->i_blkbits = src->i_blkbits;
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dest->i_flags = src->i_flags;
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fsstack_copy_inode_size(dest, src);
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}
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EXPORT_SYMBOL_GPL(fsstack_copy_attr_all);
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