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author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-17 00:20:36 +0200 |
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committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-17 00:20:36 +0200 |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /fs/hpfs/file.c | |
download | linux-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.xz linux-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.zip |
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
Diffstat (limited to 'fs/hpfs/file.c')
-rw-r--r-- | fs/hpfs/file.c | 140 |
1 files changed, 140 insertions, 0 deletions
diff --git a/fs/hpfs/file.c b/fs/hpfs/file.c new file mode 100644 index 000000000000..ab144dabd870 --- /dev/null +++ b/fs/hpfs/file.c @@ -0,0 +1,140 @@ +/* + * linux/fs/hpfs/file.c + * + * Mikulas Patocka (mikulas@artax.karlin.mff.cuni.cz), 1998-1999 + * + * file VFS functions + */ + +#include "hpfs_fn.h" + +#define BLOCKS(size) (((size) + 511) >> 9) + +static int hpfs_file_release(struct inode *inode, struct file *file) +{ + lock_kernel(); + hpfs_write_if_changed(inode); + unlock_kernel(); + return 0; +} + +int hpfs_file_fsync(struct file *file, struct dentry *dentry, int datasync) +{ + /*return file_fsync(file, dentry);*/ + return 0; /* Don't fsync :-) */ +} + +/* + * generic_file_read often calls bmap with non-existing sector, + * so we must ignore such errors. + */ + +static secno hpfs_bmap(struct inode *inode, unsigned file_secno) +{ + struct hpfs_inode_info *hpfs_inode = hpfs_i(inode); + unsigned n, disk_secno; + struct fnode *fnode; + struct buffer_head *bh; + if (BLOCKS(hpfs_i(inode)->mmu_private) <= file_secno) return 0; + n = file_secno - hpfs_inode->i_file_sec; + if (n < hpfs_inode->i_n_secs) return hpfs_inode->i_disk_sec + n; + if (!(fnode = hpfs_map_fnode(inode->i_sb, inode->i_ino, &bh))) return 0; + disk_secno = hpfs_bplus_lookup(inode->i_sb, inode, &fnode->btree, file_secno, bh); + if (disk_secno == -1) return 0; + if (hpfs_chk_sectors(inode->i_sb, disk_secno, 1, "bmap")) return 0; + return disk_secno; +} + +static void hpfs_truncate(struct inode *i) +{ + if (IS_IMMUTABLE(i)) return /*-EPERM*/; + lock_kernel(); + hpfs_i(i)->i_n_secs = 0; + i->i_blocks = 1 + ((i->i_size + 511) >> 9); + hpfs_i(i)->mmu_private = i->i_size; + hpfs_truncate_btree(i->i_sb, i->i_ino, 1, ((i->i_size + 511) >> 9)); + hpfs_write_inode(i); + hpfs_i(i)->i_n_secs = 0; + unlock_kernel(); +} + +static int hpfs_get_block(struct inode *inode, sector_t iblock, struct buffer_head *bh_result, int create) +{ + secno s; + s = hpfs_bmap(inode, iblock); + if (s) { + map_bh(bh_result, inode->i_sb, s); + return 0; + } + if (!create) return 0; + if (iblock<<9 != hpfs_i(inode)->mmu_private) { + BUG(); + return -EIO; + } + if ((s = hpfs_add_sector_to_btree(inode->i_sb, inode->i_ino, 1, inode->i_blocks - 1)) == -1) { + hpfs_truncate_btree(inode->i_sb, inode->i_ino, 1, inode->i_blocks - 1); + return -ENOSPC; + } + inode->i_blocks++; + hpfs_i(inode)->mmu_private += 512; + set_buffer_new(bh_result); + map_bh(bh_result, inode->i_sb, s); + return 0; +} + +static int hpfs_writepage(struct page *page, struct writeback_control *wbc) +{ + return block_write_full_page(page,hpfs_get_block, wbc); +} +static int hpfs_readpage(struct file *file, struct page *page) +{ + return block_read_full_page(page,hpfs_get_block); +} +static int hpfs_prepare_write(struct file *file, struct page *page, unsigned from, unsigned to) +{ + return cont_prepare_write(page,from,to,hpfs_get_block, + &hpfs_i(page->mapping->host)->mmu_private); +} +static sector_t _hpfs_bmap(struct address_space *mapping, sector_t block) +{ + return generic_block_bmap(mapping,block,hpfs_get_block); +} +struct address_space_operations hpfs_aops = { + .readpage = hpfs_readpage, + .writepage = hpfs_writepage, + .sync_page = block_sync_page, + .prepare_write = hpfs_prepare_write, + .commit_write = generic_commit_write, + .bmap = _hpfs_bmap +}; + +static ssize_t hpfs_file_write(struct file *file, const char __user *buf, + size_t count, loff_t *ppos) +{ + ssize_t retval; + + retval = generic_file_write(file, buf, count, ppos); + if (retval > 0) { + struct inode *inode = file->f_dentry->d_inode; + inode->i_mtime = CURRENT_TIME_SEC; + hpfs_i(inode)->i_dirty = 1; + } + return retval; +} + +struct file_operations hpfs_file_ops = +{ + .llseek = generic_file_llseek, + .read = generic_file_read, + .write = hpfs_file_write, + .mmap = generic_file_mmap, + .release = hpfs_file_release, + .fsync = hpfs_file_fsync, + .sendfile = generic_file_sendfile, +}; + +struct inode_operations hpfs_file_iops = +{ + .truncate = hpfs_truncate, + .setattr = hpfs_notify_change, +}; |