4b6f5d20b0
This is a conversion to make the various file_operations structs in fs/ const. Basically a regexp job, with a few manual fixups The goal is both to increase correctness (harder to accidentally write to shared datastructures) and reducing the false sharing of cachelines with things that get dirty in .data (while .rodata is nicely read only and thus cache clean) Signed-off-by: Arjan van de Ven <arjan@infradead.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
138 lines
3.6 KiB
C
138 lines
3.6 KiB
C
/*
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* linux/fs/hpfs/file.c
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*
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* Mikulas Patocka (mikulas@artax.karlin.mff.cuni.cz), 1998-1999
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*
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* file VFS functions
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*/
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#include "hpfs_fn.h"
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#define BLOCKS(size) (((size) + 511) >> 9)
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static int hpfs_file_release(struct inode *inode, struct file *file)
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{
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lock_kernel();
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hpfs_write_if_changed(inode);
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unlock_kernel();
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return 0;
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}
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int hpfs_file_fsync(struct file *file, struct dentry *dentry, int datasync)
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{
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/*return file_fsync(file, dentry);*/
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return 0; /* Don't fsync :-) */
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}
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/*
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* generic_file_read often calls bmap with non-existing sector,
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* so we must ignore such errors.
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*/
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static secno hpfs_bmap(struct inode *inode, unsigned file_secno)
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{
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struct hpfs_inode_info *hpfs_inode = hpfs_i(inode);
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unsigned n, disk_secno;
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struct fnode *fnode;
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struct buffer_head *bh;
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if (BLOCKS(hpfs_i(inode)->mmu_private) <= file_secno) return 0;
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n = file_secno - hpfs_inode->i_file_sec;
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if (n < hpfs_inode->i_n_secs) return hpfs_inode->i_disk_sec + n;
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if (!(fnode = hpfs_map_fnode(inode->i_sb, inode->i_ino, &bh))) return 0;
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disk_secno = hpfs_bplus_lookup(inode->i_sb, inode, &fnode->btree, file_secno, bh);
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if (disk_secno == -1) return 0;
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if (hpfs_chk_sectors(inode->i_sb, disk_secno, 1, "bmap")) return 0;
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return disk_secno;
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}
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static void hpfs_truncate(struct inode *i)
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{
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if (IS_IMMUTABLE(i)) return /*-EPERM*/;
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lock_kernel();
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hpfs_i(i)->i_n_secs = 0;
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i->i_blocks = 1 + ((i->i_size + 511) >> 9);
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hpfs_i(i)->mmu_private = i->i_size;
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hpfs_truncate_btree(i->i_sb, i->i_ino, 1, ((i->i_size + 511) >> 9));
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hpfs_write_inode(i);
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hpfs_i(i)->i_n_secs = 0;
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unlock_kernel();
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}
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static int hpfs_get_block(struct inode *inode, sector_t iblock, struct buffer_head *bh_result, int create)
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{
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secno s;
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s = hpfs_bmap(inode, iblock);
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if (s) {
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map_bh(bh_result, inode->i_sb, s);
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return 0;
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}
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if (!create) return 0;
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if (iblock<<9 != hpfs_i(inode)->mmu_private) {
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BUG();
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return -EIO;
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}
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if ((s = hpfs_add_sector_to_btree(inode->i_sb, inode->i_ino, 1, inode->i_blocks - 1)) == -1) {
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hpfs_truncate_btree(inode->i_sb, inode->i_ino, 1, inode->i_blocks - 1);
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return -ENOSPC;
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}
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inode->i_blocks++;
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hpfs_i(inode)->mmu_private += 512;
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set_buffer_new(bh_result);
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map_bh(bh_result, inode->i_sb, s);
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return 0;
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}
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static int hpfs_writepage(struct page *page, struct writeback_control *wbc)
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{
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return block_write_full_page(page,hpfs_get_block, wbc);
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}
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static int hpfs_readpage(struct file *file, struct page *page)
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{
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return block_read_full_page(page,hpfs_get_block);
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}
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static int hpfs_prepare_write(struct file *file, struct page *page, unsigned from, unsigned to)
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{
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return cont_prepare_write(page,from,to,hpfs_get_block,
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&hpfs_i(page->mapping->host)->mmu_private);
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}
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static sector_t _hpfs_bmap(struct address_space *mapping, sector_t block)
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{
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return generic_block_bmap(mapping,block,hpfs_get_block);
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}
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struct address_space_operations hpfs_aops = {
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.readpage = hpfs_readpage,
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.writepage = hpfs_writepage,
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.sync_page = block_sync_page,
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.prepare_write = hpfs_prepare_write,
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.commit_write = generic_commit_write,
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.bmap = _hpfs_bmap
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};
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static ssize_t hpfs_file_write(struct file *file, const char __user *buf,
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size_t count, loff_t *ppos)
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{
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ssize_t retval;
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retval = generic_file_write(file, buf, count, ppos);
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if (retval > 0)
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hpfs_i(file->f_dentry->d_inode)->i_dirty = 1;
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return retval;
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}
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const struct file_operations hpfs_file_ops =
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{
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.llseek = generic_file_llseek,
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.read = generic_file_read,
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.write = hpfs_file_write,
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.mmap = generic_file_mmap,
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.release = hpfs_file_release,
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.fsync = hpfs_file_fsync,
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.sendfile = generic_file_sendfile,
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};
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struct inode_operations hpfs_file_iops =
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{
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.truncate = hpfs_truncate,
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.setattr = hpfs_notify_change,
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};
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