linux/fs/nilfs2/ifile.c
Ryusuke Konishi ae98043f5f nilfs2: convert to SPDX license tags
Remove the verbose license text from NILFS2 files and replace them with
SPDX tags.  This does not change the license of any of the code.

Link: http://lkml.kernel.org/r/1535624528-5982-1-git-send-email-konishi.ryusuke@lab.ntt.co.jp
Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2018-09-04 16:45:02 -07:00

216 lines
5.2 KiB
C

// SPDX-License-Identifier: GPL-2.0+
/*
* ifile.c - NILFS inode file
*
* Copyright (C) 2006-2008 Nippon Telegraph and Telephone Corporation.
*
* Written by Amagai Yoshiji.
* Revised by Ryusuke Konishi.
*
*/
#include <linux/types.h>
#include <linux/buffer_head.h>
#include "nilfs.h"
#include "mdt.h"
#include "alloc.h"
#include "ifile.h"
/**
* struct nilfs_ifile_info - on-memory private data of ifile
* @mi: on-memory private data of metadata file
* @palloc_cache: persistent object allocator cache of ifile
*/
struct nilfs_ifile_info {
struct nilfs_mdt_info mi;
struct nilfs_palloc_cache palloc_cache;
};
static inline struct nilfs_ifile_info *NILFS_IFILE_I(struct inode *ifile)
{
return (struct nilfs_ifile_info *)NILFS_MDT(ifile);
}
/**
* nilfs_ifile_create_inode - create a new disk inode
* @ifile: ifile inode
* @out_ino: pointer to a variable to store inode number
* @out_bh: buffer_head contains newly allocated disk inode
*
* Return Value: On success, 0 is returned and the newly allocated inode
* number is stored in the place pointed by @ino, and buffer_head pointer
* that contains newly allocated disk inode structure is stored in the
* place pointed by @out_bh
* On error, one of the following negative error codes is returned.
*
* %-EIO - I/O error.
*
* %-ENOMEM - Insufficient amount of memory available.
*
* %-ENOSPC - No inode left.
*/
int nilfs_ifile_create_inode(struct inode *ifile, ino_t *out_ino,
struct buffer_head **out_bh)
{
struct nilfs_palloc_req req;
int ret;
req.pr_entry_nr = 0; /*
* 0 says find free inode from beginning
* of a group. dull code!!
*/
req.pr_entry_bh = NULL;
ret = nilfs_palloc_prepare_alloc_entry(ifile, &req);
if (!ret) {
ret = nilfs_palloc_get_entry_block(ifile, req.pr_entry_nr, 1,
&req.pr_entry_bh);
if (ret < 0)
nilfs_palloc_abort_alloc_entry(ifile, &req);
}
if (ret < 0) {
brelse(req.pr_entry_bh);
return ret;
}
nilfs_palloc_commit_alloc_entry(ifile, &req);
mark_buffer_dirty(req.pr_entry_bh);
nilfs_mdt_mark_dirty(ifile);
*out_ino = (ino_t)req.pr_entry_nr;
*out_bh = req.pr_entry_bh;
return 0;
}
/**
* nilfs_ifile_delete_inode - delete a disk inode
* @ifile: ifile inode
* @ino: inode number
*
* Return Value: On success, 0 is returned. On error, one of the following
* negative error codes is returned.
*
* %-EIO - I/O error.
*
* %-ENOMEM - Insufficient amount of memory available.
*
* %-ENOENT - The inode number @ino have not been allocated.
*/
int nilfs_ifile_delete_inode(struct inode *ifile, ino_t ino)
{
struct nilfs_palloc_req req = {
.pr_entry_nr = ino, .pr_entry_bh = NULL
};
struct nilfs_inode *raw_inode;
void *kaddr;
int ret;
ret = nilfs_palloc_prepare_free_entry(ifile, &req);
if (!ret) {
ret = nilfs_palloc_get_entry_block(ifile, req.pr_entry_nr, 0,
&req.pr_entry_bh);
if (ret < 0)
nilfs_palloc_abort_free_entry(ifile, &req);
}
if (ret < 0) {
brelse(req.pr_entry_bh);
return ret;
}
kaddr = kmap_atomic(req.pr_entry_bh->b_page);
raw_inode = nilfs_palloc_block_get_entry(ifile, req.pr_entry_nr,
req.pr_entry_bh, kaddr);
raw_inode->i_flags = 0;
kunmap_atomic(kaddr);
mark_buffer_dirty(req.pr_entry_bh);
brelse(req.pr_entry_bh);
nilfs_palloc_commit_free_entry(ifile, &req);
return 0;
}
int nilfs_ifile_get_inode_block(struct inode *ifile, ino_t ino,
struct buffer_head **out_bh)
{
struct super_block *sb = ifile->i_sb;
int err;
if (unlikely(!NILFS_VALID_INODE(sb, ino))) {
nilfs_error(sb, "bad inode number: %lu", (unsigned long)ino);
return -EINVAL;
}
err = nilfs_palloc_get_entry_block(ifile, ino, 0, out_bh);
if (unlikely(err))
nilfs_msg(sb, KERN_WARNING, "error %d reading inode: ino=%lu",
err, (unsigned long)ino);
return err;
}
/**
* nilfs_ifile_count_free_inodes - calculate free inodes count
* @ifile: ifile inode
* @nmaxinodes: current maximum of available inodes count [out]
* @nfreeinodes: free inodes count [out]
*/
int nilfs_ifile_count_free_inodes(struct inode *ifile,
u64 *nmaxinodes, u64 *nfreeinodes)
{
u64 nused;
int err;
*nmaxinodes = 0;
*nfreeinodes = 0;
nused = atomic64_read(&NILFS_I(ifile)->i_root->inodes_count);
err = nilfs_palloc_count_max_entries(ifile, nused, nmaxinodes);
if (likely(!err))
*nfreeinodes = *nmaxinodes - nused;
return err;
}
/**
* nilfs_ifile_read - read or get ifile inode
* @sb: super block instance
* @root: root object
* @inode_size: size of an inode
* @raw_inode: on-disk ifile inode
* @inodep: buffer to store the inode
*/
int nilfs_ifile_read(struct super_block *sb, struct nilfs_root *root,
size_t inode_size, struct nilfs_inode *raw_inode,
struct inode **inodep)
{
struct inode *ifile;
int err;
ifile = nilfs_iget_locked(sb, root, NILFS_IFILE_INO);
if (unlikely(!ifile))
return -ENOMEM;
if (!(ifile->i_state & I_NEW))
goto out;
err = nilfs_mdt_init(ifile, NILFS_MDT_GFP,
sizeof(struct nilfs_ifile_info));
if (err)
goto failed;
err = nilfs_palloc_init_blockgroup(ifile, inode_size);
if (err)
goto failed;
nilfs_palloc_setup_cache(ifile, &NILFS_IFILE_I(ifile)->palloc_cache);
err = nilfs_read_inode_common(ifile, raw_inode);
if (err)
goto failed;
unlock_new_inode(ifile);
out:
*inodep = ifile;
return 0;
failed:
iget_failed(ifile);
return err;
}