diff options
author | Yunhong Jiang <yunhong.jiang@intel.com> | 2015-08-04 12:17:53 -0700 |
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committer | Yunhong Jiang <yunhong.jiang@intel.com> | 2015-08-04 15:44:42 -0700 |
commit | 9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 (patch) | |
tree | 1c9cafbcd35f783a87880a10f85d1a060db1a563 /kernel/fs/coda/file.c | |
parent | 98260f3884f4a202f9ca5eabed40b1354c489b29 (diff) |
Add the rt linux 4.1.3-rt3 as base
Import the rt linux 4.1.3-rt3 as OPNFV kvm base.
It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and
the base is:
commit 0917f823c59692d751951bf5ea699a2d1e2f26a2
Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date: Sat Jul 25 12:13:34 2015 +0200
Prepare v4.1.3-rt3
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
We lose all the git history this way and it's not good. We
should apply another opnfv project repo in future.
Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423
Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>
Diffstat (limited to 'kernel/fs/coda/file.c')
-rw-r--r-- | kernel/fs/coda/file.c | 230 |
1 files changed, 230 insertions, 0 deletions
diff --git a/kernel/fs/coda/file.c b/kernel/fs/coda/file.c new file mode 100644 index 000000000..1da3805f3 --- /dev/null +++ b/kernel/fs/coda/file.c @@ -0,0 +1,230 @@ +/* + * File operations for Coda. + * Original version: (C) 1996 Peter Braam + * Rewritten for Linux 2.1: (C) 1997 Carnegie Mellon University + * + * Carnegie Mellon encourages users of this code to contribute improvements + * to the Coda project. Contact Peter Braam <coda@cs.cmu.edu>. + */ + +#include <linux/types.h> +#include <linux/kernel.h> +#include <linux/time.h> +#include <linux/file.h> +#include <linux/fs.h> +#include <linux/stat.h> +#include <linux/cred.h> +#include <linux/errno.h> +#include <linux/spinlock.h> +#include <linux/string.h> +#include <linux/slab.h> +#include <linux/uaccess.h> + +#include <linux/coda.h> +#include <linux/coda_psdev.h> + +#include "coda_linux.h" +#include "coda_int.h" + +static ssize_t +coda_file_read_iter(struct kiocb *iocb, struct iov_iter *to) +{ + struct file *coda_file = iocb->ki_filp; + struct coda_file_info *cfi = CODA_FTOC(coda_file); + + BUG_ON(!cfi || cfi->cfi_magic != CODA_MAGIC); + + return vfs_iter_read(cfi->cfi_container, to, &iocb->ki_pos); +} + +static ssize_t +coda_file_splice_read(struct file *coda_file, loff_t *ppos, + struct pipe_inode_info *pipe, size_t count, + unsigned int flags) +{ + ssize_t (*splice_read)(struct file *, loff_t *, + struct pipe_inode_info *, size_t, unsigned int); + struct coda_file_info *cfi; + struct file *host_file; + + cfi = CODA_FTOC(coda_file); + BUG_ON(!cfi || cfi->cfi_magic != CODA_MAGIC); + host_file = cfi->cfi_container; + + splice_read = host_file->f_op->splice_read; + if (!splice_read) + splice_read = default_file_splice_read; + + return splice_read(host_file, ppos, pipe, count, flags); +} + +static ssize_t +coda_file_write_iter(struct kiocb *iocb, struct iov_iter *to) +{ + struct file *coda_file = iocb->ki_filp; + struct inode *coda_inode = file_inode(coda_file); + struct coda_file_info *cfi = CODA_FTOC(coda_file); + struct file *host_file; + ssize_t ret; + + BUG_ON(!cfi || cfi->cfi_magic != CODA_MAGIC); + + host_file = cfi->cfi_container; + file_start_write(host_file); + mutex_lock(&coda_inode->i_mutex); + ret = vfs_iter_write(cfi->cfi_container, to, &iocb->ki_pos); + coda_inode->i_size = file_inode(host_file)->i_size; + coda_inode->i_blocks = (coda_inode->i_size + 511) >> 9; + coda_inode->i_mtime = coda_inode->i_ctime = CURRENT_TIME_SEC; + mutex_unlock(&coda_inode->i_mutex); + file_end_write(host_file); + return ret; +} + +static int +coda_file_mmap(struct file *coda_file, struct vm_area_struct *vma) +{ + struct coda_file_info *cfi; + struct coda_inode_info *cii; + struct file *host_file; + struct inode *coda_inode, *host_inode; + + cfi = CODA_FTOC(coda_file); + BUG_ON(!cfi || cfi->cfi_magic != CODA_MAGIC); + host_file = cfi->cfi_container; + + if (!host_file->f_op->mmap) + return -ENODEV; + + coda_inode = file_inode(coda_file); + host_inode = file_inode(host_file); + + cii = ITOC(coda_inode); + spin_lock(&cii->c_lock); + coda_file->f_mapping = host_file->f_mapping; + if (coda_inode->i_mapping == &coda_inode->i_data) + coda_inode->i_mapping = host_inode->i_mapping; + + /* only allow additional mmaps as long as userspace isn't changing + * the container file on us! */ + else if (coda_inode->i_mapping != host_inode->i_mapping) { + spin_unlock(&cii->c_lock); + return -EBUSY; + } + + /* keep track of how often the coda_inode/host_file has been mmapped */ + cii->c_mapcount++; + cfi->cfi_mapcount++; + spin_unlock(&cii->c_lock); + + return host_file->f_op->mmap(host_file, vma); +} + +int coda_open(struct inode *coda_inode, struct file *coda_file) +{ + struct file *host_file = NULL; + int error; + unsigned short flags = coda_file->f_flags & (~O_EXCL); + unsigned short coda_flags = coda_flags_to_cflags(flags); + struct coda_file_info *cfi; + + cfi = kmalloc(sizeof(struct coda_file_info), GFP_KERNEL); + if (!cfi) + return -ENOMEM; + + error = venus_open(coda_inode->i_sb, coda_i2f(coda_inode), coda_flags, + &host_file); + if (!host_file) + error = -EIO; + + if (error) { + kfree(cfi); + return error; + } + + host_file->f_flags |= coda_file->f_flags & (O_APPEND | O_SYNC); + + cfi->cfi_magic = CODA_MAGIC; + cfi->cfi_mapcount = 0; + cfi->cfi_container = host_file; + + BUG_ON(coda_file->private_data != NULL); + coda_file->private_data = cfi; + return 0; +} + +int coda_release(struct inode *coda_inode, struct file *coda_file) +{ + unsigned short flags = (coda_file->f_flags) & (~O_EXCL); + unsigned short coda_flags = coda_flags_to_cflags(flags); + struct coda_file_info *cfi; + struct coda_inode_info *cii; + struct inode *host_inode; + int err; + + cfi = CODA_FTOC(coda_file); + BUG_ON(!cfi || cfi->cfi_magic != CODA_MAGIC); + + err = venus_close(coda_inode->i_sb, coda_i2f(coda_inode), + coda_flags, coda_file->f_cred->fsuid); + + host_inode = file_inode(cfi->cfi_container); + cii = ITOC(coda_inode); + + /* did we mmap this file? */ + spin_lock(&cii->c_lock); + if (coda_inode->i_mapping == &host_inode->i_data) { + cii->c_mapcount -= cfi->cfi_mapcount; + if (!cii->c_mapcount) + coda_inode->i_mapping = &coda_inode->i_data; + } + spin_unlock(&cii->c_lock); + + fput(cfi->cfi_container); + kfree(coda_file->private_data); + coda_file->private_data = NULL; + + /* VFS fput ignores the return value from file_operations->release, so + * there is no use returning an error here */ + return 0; +} + +int coda_fsync(struct file *coda_file, loff_t start, loff_t end, int datasync) +{ + struct file *host_file; + struct inode *coda_inode = file_inode(coda_file); + struct coda_file_info *cfi; + int err; + + if (!(S_ISREG(coda_inode->i_mode) || S_ISDIR(coda_inode->i_mode) || + S_ISLNK(coda_inode->i_mode))) + return -EINVAL; + + err = filemap_write_and_wait_range(coda_inode->i_mapping, start, end); + if (err) + return err; + mutex_lock(&coda_inode->i_mutex); + + cfi = CODA_FTOC(coda_file); + BUG_ON(!cfi || cfi->cfi_magic != CODA_MAGIC); + host_file = cfi->cfi_container; + + err = vfs_fsync(host_file, datasync); + if (!err && !datasync) + err = venus_fsync(coda_inode->i_sb, coda_i2f(coda_inode)); + mutex_unlock(&coda_inode->i_mutex); + + return err; +} + +const struct file_operations coda_file_operations = { + .llseek = generic_file_llseek, + .read_iter = coda_file_read_iter, + .write_iter = coda_file_write_iter, + .mmap = coda_file_mmap, + .open = coda_open, + .release = coda_release, + .fsync = coda_fsync, + .splice_read = coda_file_splice_read, +}; + |