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FS / libfs: Implement simple_write_to_buffer

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It will be used in suspend code and serves as an easy wrap around
copy_from_user. Similar to simple_read_from_buffer, it takes care
of transfers with proper lengths depending on available and count
parameters and advances ppos appropriately.

Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
This commit is contained in:
Jiri Slaby 2010-05-01 23:51:22 +02:00 • committed by Rafael J. Wysocki
commit 6a727b43be
2 changed files with 37 additions and 0 deletions
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include/linux/fs.h
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@ -2362,6 +2362,8 @@ extern void simple_release_fs(struct vfsmount **mount, int *count);
extern ssize_t simple_read_from_buffer(void __user *to, size_t count,
loff_t *ppos, const void *from, size_t available);
extern ssize_t simple_write_to_buffer(void *to, size_t available, loff_t *ppos,
const void __user *from, size_t count);
extern int simple_fsync(struct file *, struct dentry *, int);