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author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 22:20:36 (GMT) |
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committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 22:20:36 (GMT) |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /fs/smbfs/file.c | |
download | linux-fsl-qoriq-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.xz |
Linux-2.6.12-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/smbfs/file.c')
-rw-r--r-- | fs/smbfs/file.c | 423 |
1 files changed, 423 insertions, 0 deletions
diff --git a/fs/smbfs/file.c b/fs/smbfs/file.c new file mode 100644 index 0000000..b4fcfa8 --- /dev/null +++ b/fs/smbfs/file.c @@ -0,0 +1,423 @@ +/* + * file.c + * + * Copyright (C) 1995, 1996, 1997 by Paal-Kr. Engstad and Volker Lendecke + * Copyright (C) 1997 by Volker Lendecke + * + * Please add a note about your changes to smbfs in the ChangeLog file. + */ + +#include <linux/time.h> +#include <linux/kernel.h> +#include <linux/errno.h> +#include <linux/fcntl.h> +#include <linux/stat.h> +#include <linux/mm.h> +#include <linux/slab.h> +#include <linux/pagemap.h> +#include <linux/smp_lock.h> +#include <linux/net.h> + +#include <asm/uaccess.h> +#include <asm/system.h> + +#include <linux/smbno.h> +#include <linux/smb_fs.h> + +#include "smb_debug.h" +#include "proto.h" + +static int +smb_fsync(struct file *file, struct dentry * dentry, int datasync) +{ + struct smb_sb_info *server = server_from_dentry(dentry); + int result; + + VERBOSE("sync file %s/%s\n", DENTRY_PATH(dentry)); + + /* + * The VFS will writepage() all dirty pages for us, but we + * should send a SMBflush to the server, letting it know that + * we want things synchronized with actual storage. + * + * Note: this function requires all pages to have been written already + * (should be ok with writepage_sync) + */ + result = smb_proc_flush(server, SMB_I(dentry->d_inode)->fileid); + return result; +} + +/* + * Read a page synchronously. + */ +static int +smb_readpage_sync(struct dentry *dentry, struct page *page) +{ + char *buffer = kmap(page); + loff_t offset = (loff_t)page->index << PAGE_CACHE_SHIFT; + struct smb_sb_info *server = server_from_dentry(dentry); + unsigned int rsize = smb_get_rsize(server); + int count = PAGE_SIZE; + int result; + + VERBOSE("file %s/%s, count=%d@%Ld, rsize=%d\n", + DENTRY_PATH(dentry), count, offset, rsize); + + result = smb_open(dentry, SMB_O_RDONLY); + if (result < 0) + goto io_error; + + do { + if (count < rsize) + rsize = count; + + result = server->ops->read(dentry->d_inode,offset,rsize,buffer); + if (result < 0) + goto io_error; + + count -= result; + offset += result; + buffer += result; + dentry->d_inode->i_atime = + current_fs_time(dentry->d_inode->i_sb); + if (result < rsize) + break; + } while (count); + + memset(buffer, 0, count); + flush_dcache_page(page); + SetPageUptodate(page); + result = 0; + +io_error: + kunmap(page); + unlock_page(page); + return result; +} + +/* + * We are called with the page locked and we unlock it when done. + */ +static int +smb_readpage(struct file *file, struct page *page) +{ + int error; + struct dentry *dentry = file->f_dentry; + + page_cache_get(page); + error = smb_readpage_sync(dentry, page); + page_cache_release(page); + return error; +} + +/* + * Write a page synchronously. + * Offset is the data offset within the page. + */ +static int +smb_writepage_sync(struct inode *inode, struct page *page, + unsigned long pageoffset, unsigned int count) +{ + loff_t offset; + char *buffer = kmap(page) + pageoffset; + struct smb_sb_info *server = server_from_inode(inode); + unsigned int wsize = smb_get_wsize(server); + int ret = 0; + + offset = ((loff_t)page->index << PAGE_CACHE_SHIFT) + pageoffset; + VERBOSE("file ino=%ld, fileid=%d, count=%d@%Ld, wsize=%d\n", + inode->i_ino, SMB_I(inode)->fileid, count, offset, wsize); + + do { + int write_ret; + + if (count < wsize) + wsize = count; + + write_ret = server->ops->write(inode, offset, wsize, buffer); + if (write_ret < 0) { + PARANOIA("failed write, wsize=%d, write_ret=%d\n", + wsize, write_ret); + ret = write_ret; + break; + } + /* N.B. what if result < wsize?? */ +#ifdef SMBFS_PARANOIA + if (write_ret < wsize) + PARANOIA("short write, wsize=%d, write_ret=%d\n", + wsize, write_ret); +#endif + buffer += wsize; + offset += wsize; + count -= wsize; + /* + * Update the inode now rather than waiting for a refresh. + */ + inode->i_mtime = inode->i_atime = current_fs_time(inode->i_sb); + SMB_I(inode)->flags |= SMB_F_LOCALWRITE; + if (offset > inode->i_size) + inode->i_size = offset; + } while (count); + + kunmap(page); + return ret; +} + +/* + * Write a page to the server. This will be used for NFS swapping only + * (for now), and we currently do this synchronously only. + * + * We are called with the page locked and we unlock it when done. + */ +static int +smb_writepage(struct page *page, struct writeback_control *wbc) +{ + struct address_space *mapping = page->mapping; + struct inode *inode; + unsigned long end_index; + unsigned offset = PAGE_CACHE_SIZE; + int err; + + if (!mapping) + BUG(); + inode = mapping->host; + if (!inode) + BUG(); + + end_index = inode->i_size >> PAGE_CACHE_SHIFT; + + /* easy case */ + if (page->index < end_index) + goto do_it; + /* things got complicated... */ + offset = inode->i_size & (PAGE_CACHE_SIZE-1); + /* OK, are we completely out? */ + if (page->index >= end_index+1 || !offset) + return 0; /* truncated - don't care */ +do_it: + page_cache_get(page); + err = smb_writepage_sync(inode, page, 0, offset); + SetPageUptodate(page); + unlock_page(page); + page_cache_release(page); + return err; +} + +static int +smb_updatepage(struct file *file, struct page *page, unsigned long offset, + unsigned int count) +{ + struct dentry *dentry = file->f_dentry; + + DEBUG1("(%s/%s %d@%ld)\n", DENTRY_PATH(dentry), + count, (page->index << PAGE_CACHE_SHIFT)+offset); + + return smb_writepage_sync(dentry->d_inode, page, offset, count); +} + +static ssize_t +smb_file_read(struct file * file, char __user * buf, size_t count, loff_t *ppos) +{ + struct dentry * dentry = file->f_dentry; + ssize_t status; + + VERBOSE("file %s/%s, count=%lu@%lu\n", DENTRY_PATH(dentry), + (unsigned long) count, (unsigned long) *ppos); + + status = smb_revalidate_inode(dentry); + if (status) { + PARANOIA("%s/%s validation failed, error=%Zd\n", + DENTRY_PATH(dentry), status); + goto out; + } + + VERBOSE("before read, size=%ld, flags=%x, atime=%ld\n", + (long)dentry->d_inode->i_size, + dentry->d_inode->i_flags, dentry->d_inode->i_atime); + + status = generic_file_read(file, buf, count, ppos); +out: + return status; +} + +static int +smb_file_mmap(struct file * file, struct vm_area_struct * vma) +{ + struct dentry * dentry = file->f_dentry; + int status; + + VERBOSE("file %s/%s, address %lu - %lu\n", + DENTRY_PATH(dentry), vma->vm_start, vma->vm_end); + + status = smb_revalidate_inode(dentry); + if (status) { + PARANOIA("%s/%s validation failed, error=%d\n", + DENTRY_PATH(dentry), status); + goto out; + } + status = generic_file_mmap(file, vma); +out: + return status; +} + +static ssize_t +smb_file_sendfile(struct file *file, loff_t *ppos, + size_t count, read_actor_t actor, void *target) +{ + struct dentry *dentry = file->f_dentry; + ssize_t status; + + VERBOSE("file %s/%s, pos=%Ld, count=%d\n", + DENTRY_PATH(dentry), *ppos, count); + + status = smb_revalidate_inode(dentry); + if (status) { + PARANOIA("%s/%s validation failed, error=%Zd\n", + DENTRY_PATH(dentry), status); + goto out; + } + status = generic_file_sendfile(file, ppos, count, actor, target); +out: + return status; +} + +/* + * This does the "real" work of the write. The generic routine has + * allocated the page, locked it, done all the page alignment stuff + * calculations etc. Now we should just copy the data from user + * space and write it back to the real medium.. + * + * If the writer ends up delaying the write, the writer needs to + * increment the page use counts until he is done with the page. + */ +static int smb_prepare_write(struct file *file, struct page *page, + unsigned offset, unsigned to) +{ + return 0; +} + +static int smb_commit_write(struct file *file, struct page *page, + unsigned offset, unsigned to) +{ + int status; + + status = -EFAULT; + lock_kernel(); + status = smb_updatepage(file, page, offset, to-offset); + unlock_kernel(); + return status; +} + +struct address_space_operations smb_file_aops = { + .readpage = smb_readpage, + .writepage = smb_writepage, + .prepare_write = smb_prepare_write, + .commit_write = smb_commit_write +}; + +/* + * Write to a file (through the page cache). + */ +static ssize_t +smb_file_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos) +{ + struct dentry * dentry = file->f_dentry; + ssize_t result; + + VERBOSE("file %s/%s, count=%lu@%lu\n", + DENTRY_PATH(dentry), + (unsigned long) count, (unsigned long) *ppos); + + result = smb_revalidate_inode(dentry); + if (result) { + PARANOIA("%s/%s validation failed, error=%Zd\n", + DENTRY_PATH(dentry), result); + goto out; + } + + result = smb_open(dentry, SMB_O_WRONLY); + if (result) + goto out; + + if (count > 0) { + result = generic_file_write(file, buf, count, ppos); + VERBOSE("pos=%ld, size=%ld, mtime=%ld, atime=%ld\n", + (long) file->f_pos, (long) dentry->d_inode->i_size, + dentry->d_inode->i_mtime, dentry->d_inode->i_atime); + } +out: + return result; +} + +static int +smb_file_open(struct inode *inode, struct file * file) +{ + int result; + struct dentry *dentry = file->f_dentry; + int smb_mode = (file->f_mode & O_ACCMODE) - 1; + + lock_kernel(); + result = smb_open(dentry, smb_mode); + if (result) + goto out; + SMB_I(inode)->openers++; +out: + unlock_kernel(); + return result; +} + +static int +smb_file_release(struct inode *inode, struct file * file) +{ + lock_kernel(); + if (!--SMB_I(inode)->openers) { + /* We must flush any dirty pages now as we won't be able to + write anything after close. mmap can trigger this. + "openers" should perhaps include mmap'ers ... */ + filemap_fdatawrite(inode->i_mapping); + filemap_fdatawait(inode->i_mapping); + smb_close(inode); + } + unlock_kernel(); + return 0; +} + +/* + * Check whether the required access is compatible with + * an inode's permission. SMB doesn't recognize superuser + * privileges, so we need our own check for this. + */ +static int +smb_file_permission(struct inode *inode, int mask, struct nameidata *nd) +{ + int mode = inode->i_mode; + int error = 0; + + VERBOSE("mode=%x, mask=%x\n", mode, mask); + + /* Look at user permissions */ + mode >>= 6; + if ((mode & 7 & mask) != mask) + error = -EACCES; + return error; +} + +struct file_operations smb_file_operations = +{ + .llseek = remote_llseek, + .read = smb_file_read, + .write = smb_file_write, + .ioctl = smb_ioctl, + .mmap = smb_file_mmap, + .open = smb_file_open, + .release = smb_file_release, + .fsync = smb_fsync, + .sendfile = smb_file_sendfile, +}; + +struct inode_operations smb_file_inode_operations = +{ + .permission = smb_file_permission, + .getattr = smb_getattr, + .setattr = smb_notify_change, +}; |