file.c 33.3 KB
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#include <linux/ceph/ceph_debug.h>
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#include <linux/module.h>
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#include <linux/sched.h>
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#include <linux/slab.h>
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#include <linux/file.h>
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#include <linux/mount.h>
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#include <linux/namei.h>
#include <linux/writeback.h>
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#include <linux/aio.h>
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#include <linux/falloc.h>
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#include "super.h"
#include "mds_client.h"
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#include "cache.h"
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/*
 * Ceph file operations
 *
 * Implement basic open/close functionality, and implement
 * read/write.
 *
 * We implement three modes of file I/O:
 *  - buffered uses the generic_file_aio_{read,write} helpers
 *
 *  - synchronous is used when there is multi-client read/write
 *    sharing, avoids the page cache, and synchronously waits for an
 *    ack from the OSD.
 *
 *  - direct io takes the variant of the sync path that references
 *    user pages directly.
 *
 * fsync() flushes and waits on dirty pages, but just queues metadata
 * for writeback: since the MDS can recover size and mtime there is no
 * need to wait for MDS acknowledgement.
 */


/*
 * Prepare an open request.  Preallocate ceph_cap to avoid an
 * inopportune ENOMEM later.
 */
static struct ceph_mds_request *
prepare_open_request(struct super_block *sb, int flags, int create_mode)
{
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	struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
	struct ceph_mds_client *mdsc = fsc->mdsc;
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	struct ceph_mds_request *req;
	int want_auth = USE_ANY_MDS;
	int op = (flags & O_CREAT) ? CEPH_MDS_OP_CREATE : CEPH_MDS_OP_OPEN;

	if (flags & (O_WRONLY|O_RDWR|O_CREAT|O_TRUNC))
		want_auth = USE_AUTH_MDS;

	req = ceph_mdsc_create_request(mdsc, op, want_auth);
	if (IS_ERR(req))
		goto out;
	req->r_fmode = ceph_flags_to_mode(flags);
	req->r_args.open.flags = cpu_to_le32(flags);
	req->r_args.open.mode = cpu_to_le32(create_mode);
out:
	return req;
}

/*
 * initialize private struct file data.
 * if we fail, clean up by dropping fmode reference on the ceph_inode
 */
static int ceph_init_file(struct inode *inode, struct file *file, int fmode)
{
	struct ceph_file_info *cf;
	int ret = 0;
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	struct ceph_inode_info *ci = ceph_inode(inode);
	struct ceph_fs_client *fsc = ceph_sb_to_client(inode->i_sb);
	struct ceph_mds_client *mdsc = fsc->mdsc;
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	switch (inode->i_mode & S_IFMT) {
	case S_IFREG:
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		/* First file open request creates the cookie, we want to keep
		 * this cookie around for the filetime of the inode as not to
		 * have to worry about fscache register / revoke / operation
		 * races.
		 *
		 * Also, if we know the operation is going to invalidate data
		 * (non readonly) just nuke the cache right away.
		 */
		ceph_fscache_register_inode_cookie(mdsc->fsc, ci);
		if ((fmode & CEPH_FILE_MODE_WR))
			ceph_fscache_invalidate(inode);
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	case S_IFDIR:
		dout("init_file %p %p 0%o (regular)\n", inode, file,
		     inode->i_mode);
		cf = kmem_cache_alloc(ceph_file_cachep, GFP_NOFS | __GFP_ZERO);
		if (cf == NULL) {
			ceph_put_fmode(ceph_inode(inode), fmode); /* clean up */
			return -ENOMEM;
		}
		cf->fmode = fmode;
		cf->next_offset = 2;
		file->private_data = cf;
		BUG_ON(inode->i_fop->release != ceph_release);
		break;

	case S_IFLNK:
		dout("init_file %p %p 0%o (symlink)\n", inode, file,
		     inode->i_mode);
		ceph_put_fmode(ceph_inode(inode), fmode); /* clean up */
		break;

	default:
		dout("init_file %p %p 0%o (special)\n", inode, file,
		     inode->i_mode);
		/*
		 * we need to drop the open ref now, since we don't
		 * have .release set to ceph_release.
		 */
		ceph_put_fmode(ceph_inode(inode), fmode); /* clean up */
		BUG_ON(inode->i_fop->release == ceph_release);

		/* call the proper open fop */
		ret = inode->i_fop->open(inode, file);
	}
	return ret;
}

/*
 * If we already have the requisite capabilities, we can satisfy
 * the open request locally (no need to request new caps from the
 * MDS).  We do, however, need to inform the MDS (asynchronously)
 * if our wanted caps set expands.
 */
int ceph_open(struct inode *inode, struct file *file)
{
	struct ceph_inode_info *ci = ceph_inode(inode);
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	struct ceph_fs_client *fsc = ceph_sb_to_client(inode->i_sb);
	struct ceph_mds_client *mdsc = fsc->mdsc;
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	struct ceph_mds_request *req;
	struct ceph_file_info *cf = file->private_data;
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	struct inode *parent_inode = NULL;
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	int err;
	int flags, fmode, wanted;

	if (cf) {
		dout("open file %p is already opened\n", file);
		return 0;
	}

	/* filter out O_CREAT|O_EXCL; vfs did that already.  yuck. */
	flags = file->f_flags & ~(O_CREAT|O_EXCL);
	if (S_ISDIR(inode->i_mode))
		flags = O_DIRECTORY;  /* mds likes to know */

	dout("open inode %p ino %llx.%llx file %p flags %d (%d)\n", inode,
	     ceph_vinop(inode), file, flags, file->f_flags);
	fmode = ceph_flags_to_mode(flags);
	wanted = ceph_caps_for_mode(fmode);

	/* snapped files are read-only */
	if (ceph_snap(inode) != CEPH_NOSNAP && (file->f_mode & FMODE_WRITE))
		return -EROFS;

	/* trivially open snapdir */
	if (ceph_snap(inode) == CEPH_SNAPDIR) {
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		spin_lock(&ci->i_ceph_lock);
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		__ceph_get_fmode(ci, fmode);
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		spin_unlock(&ci->i_ceph_lock);
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		return ceph_init_file(inode, file, fmode);
	}

	/*
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	 * No need to block if we have caps on the auth MDS (for
	 * write) or any MDS (for read).  Update wanted set
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	 * asynchronously.
	 */
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	spin_lock(&ci->i_ceph_lock);
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	if (__ceph_is_any_real_caps(ci) &&
	    (((fmode & CEPH_FILE_MODE_WR) == 0) || ci->i_auth_cap)) {
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		int mds_wanted = __ceph_caps_mds_wanted(ci);
		int issued = __ceph_caps_issued(ci, NULL);

		dout("open %p fmode %d want %s issued %s using existing\n",
		     inode, fmode, ceph_cap_string(wanted),
		     ceph_cap_string(issued));
		__ceph_get_fmode(ci, fmode);
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		spin_unlock(&ci->i_ceph_lock);
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		/* adjust wanted? */
		if ((issued & wanted) != wanted &&
		    (mds_wanted & wanted) != wanted &&
		    ceph_snap(inode) != CEPH_SNAPDIR)
			ceph_check_caps(ci, 0, NULL);

		return ceph_init_file(inode, file, fmode);
	} else if (ceph_snap(inode) != CEPH_NOSNAP &&
		   (ci->i_snap_caps & wanted) == wanted) {
		__ceph_get_fmode(ci, fmode);
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		spin_unlock(&ci->i_ceph_lock);
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		return ceph_init_file(inode, file, fmode);
	}
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	spin_unlock(&ci->i_ceph_lock);
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	dout("open fmode %d wants %s\n", fmode, ceph_cap_string(wanted));
	req = prepare_open_request(inode->i_sb, flags, 0);
	if (IS_ERR(req)) {
		err = PTR_ERR(req);
		goto out;
	}
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	req->r_inode = inode;
	ihold(inode);
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	req->r_num_caps = 1;
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	if (flags & (O_CREAT|O_TRUNC))
		parent_inode = ceph_get_dentry_parent_inode(file->f_dentry);
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	err = ceph_mdsc_do_request(mdsc, parent_inode, req);
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	iput(parent_inode);
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	if (!err)
		err = ceph_init_file(inode, file, req->r_fmode);
	ceph_mdsc_put_request(req);
	dout("open result=%d on %llx.%llx\n", err, ceph_vinop(inode));
out:
	return err;
}


/*
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 * Do a lookup + open with a single request.  If we get a non-existent
 * file or symlink, return 1 so the VFS can retry.
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 */
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int ceph_atomic_open(struct inode *dir, struct dentry *dentry,
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		     struct file *file, unsigned flags, umode_t mode,
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		     int *opened)
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{
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	struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
	struct ceph_mds_client *mdsc = fsc->mdsc;
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	struct ceph_mds_request *req;
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	struct dentry *dn;
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	int err;

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	dout("atomic_open %p dentry %p '%.*s' %s flags %d mode 0%o\n",
	     dir, dentry, dentry->d_name.len, dentry->d_name.name,
	     d_unhashed(dentry) ? "unhashed" : "hashed", flags, mode);

	if (dentry->d_name.len > NAME_MAX)
		return -ENAMETOOLONG;

	err = ceph_init_dentry(dentry);
	if (err < 0)
		return err;
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	/* do the open */
	req = prepare_open_request(dir->i_sb, flags, mode);
	if (IS_ERR(req))
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		return PTR_ERR(req);
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	req->r_dentry = dget(dentry);
	req->r_num_caps = 2;
	if (flags & O_CREAT) {
		req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
		req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
	}
	req->r_locked_dir = dir;           /* caller holds dir->i_mutex */
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	err = ceph_mdsc_do_request(mdsc,
				   (flags & (O_CREAT|O_TRUNC)) ? dir : NULL,
				   req);
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	if (err)
		goto out_err;

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	err = ceph_handle_snapdir(req, dentry, err);
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	if (err == 0 && (flags & O_CREAT) && !req->r_reply_info.head->is_dentry)
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		err = ceph_handle_notrace_create(dir, dentry);
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	if (d_unhashed(dentry)) {
		dn = ceph_finish_lookup(req, dentry, err);
		if (IS_ERR(dn))
			err = PTR_ERR(dn);
	} else {
		/* we were given a hashed negative dentry */
		dn = NULL;
	}
	if (err)
		goto out_err;
	if (dn || dentry->d_inode == NULL || S_ISLNK(dentry->d_inode->i_mode)) {
		/* make vfs retry on splice, ENOENT, or symlink */
		dout("atomic_open finish_no_open on dn %p\n", dn);
		err = finish_no_open(file, dn);
	} else {
		dout("atomic_open finish_open on dn %p\n", dn);
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		if (req->r_op == CEPH_MDS_OP_CREATE && req->r_reply_info.has_create_ino) {
			*opened |= FILE_CREATED;
		}
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		err = finish_open(file, dentry, ceph_open, opened);
	}
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out_err:
	ceph_mdsc_put_request(req);
	dout("atomic_open result=%d\n", err);
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	return err;
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}

int ceph_release(struct inode *inode, struct file *file)
{
	struct ceph_inode_info *ci = ceph_inode(inode);
	struct ceph_file_info *cf = file->private_data;

	dout("release inode %p file %p\n", inode, file);
	ceph_put_fmode(ci, cf->fmode);
	if (cf->last_readdir)
		ceph_mdsc_put_request(cf->last_readdir);
	kfree(cf->last_name);
	kfree(cf->dir_info);
	dput(cf->dentry);
	kmem_cache_free(ceph_file_cachep, cf);
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	/* wake up anyone waiting for caps on this inode */
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	wake_up_all(&ci->i_cap_wq);
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	return 0;
}

/*
 * Read a range of bytes striped over one or more objects.  Iterate over
 * objects we stripe over.  (That's not atomic, but good enough for now.)
 *
 * If we get a short result from the OSD, check against i_size; we need to
 * only return a short read to the caller if we hit EOF.
 */
static int striped_read(struct inode *inode,
			u64 off, u64 len,
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			struct page **pages, int num_pages,
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			int *checkeof, bool o_direct,
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			unsigned long buf_align)
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{
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	struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
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	struct ceph_inode_info *ci = ceph_inode(inode);
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	u64 pos, this_len, left;
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	int io_align, page_align;
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	int pages_left;
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	int read;
	struct page **page_pos;
	int ret;
	bool hit_stripe, was_short;

	/*
	 * we may need to do multiple reads.  not atomic, unfortunately.
	 */
	pos = off;
	left = len;
	page_pos = pages;
	pages_left = num_pages;
	read = 0;
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	io_align = off & ~PAGE_MASK;
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more:
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	if (o_direct)
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		page_align = (pos - io_align + buf_align) & ~PAGE_MASK;
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	else
		page_align = pos & ~PAGE_MASK;
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	this_len = left;
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	ret = ceph_osdc_readpages(&fsc->client->osdc, ceph_vino(inode),
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				  &ci->i_layout, pos, &this_len,
				  ci->i_truncate_seq,
				  ci->i_truncate_size,
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				  page_pos, pages_left, page_align);
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	if (ret == -ENOENT)
		ret = 0;
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	hit_stripe = this_len < left;
	was_short = ret >= 0 && ret < this_len;
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	dout("striped_read %llu~%llu (read %u) got %d%s%s\n", pos, left, read,
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	     ret, hit_stripe ? " HITSTRIPE" : "", was_short ? " SHORT" : "");

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	if (ret >= 0) {
		int didpages;
		if (was_short && (pos + ret < inode->i_size)) {
			u64 tmp = min(this_len - ret,
					inode->i_size - pos - ret);
			dout(" zero gap %llu to %llu\n",
				pos + ret, pos + ret + tmp);
			ceph_zero_page_vector_range(page_align + read + ret,
							tmp, pages);
			ret += tmp;
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		}
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		didpages = (page_align + ret) >> PAGE_CACHE_SHIFT;
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		pos += ret;
		read = pos - off;
		left -= ret;
		page_pos += didpages;
		pages_left -= didpages;

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		/* hit stripe and need continue*/
		if (left && hit_stripe && pos < inode->i_size)
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			goto more;
	}

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	if (read > 0) {
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		ret = read;
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		/* did we bounce off eof? */
		if (pos + left > inode->i_size)
			*checkeof = 1;
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	}

	dout("striped_read returns %d\n", ret);
	return ret;
}

/*
 * Completely synchronous read and write methods.  Direct from __user
 * buffer to osd, or directly to user pages (if O_DIRECT).
 *
 * If the read spans object boundary, just do multiple reads.
 */
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static ssize_t ceph_sync_read(struct kiocb *iocb, struct iov_iter *i,
				int *checkeof)
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{
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	struct file *file = iocb->ki_filp;
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	struct inode *inode = file_inode(file);
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	struct page **pages;
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	u64 off = iocb->ki_pos;
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	int num_pages, ret;
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	size_t len = i->count;
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	dout("sync_read on file %p %llu~%u %s\n", file, off,
	     (unsigned)len,
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	     (file->f_flags & O_DIRECT) ? "O_DIRECT" : "");
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	/*
	 * flush any page cache pages in this range.  this
	 * will make concurrent normal and sync io slow,
	 * but it will at least behave sensibly when they are
	 * in sequence.
	 */
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	ret = filemap_write_and_wait_range(inode->i_mapping, off,
						off + len);
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	if (ret < 0)
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		return ret;
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	if (file->f_flags & O_DIRECT) {
		while (iov_iter_count(i)) {
			void __user *data = i->iov[0].iov_base + i->iov_offset;
			size_t len = i->iov[0].iov_len - i->iov_offset;

			num_pages = calc_pages_for((unsigned long)data, len);
			pages = ceph_get_direct_page_vector(data,
							    num_pages, true);
			if (IS_ERR(pages))
				return PTR_ERR(pages);

			ret = striped_read(inode, off, len,
					   pages, num_pages, checkeof,
					   1, (unsigned long)data & ~PAGE_MASK);
			ceph_put_page_vector(pages, num_pages, true);

			if (ret <= 0)
				break;
			off += ret;
			iov_iter_advance(i, ret);
			if (ret < len)
				break;
		}
	} else {
		num_pages = calc_pages_for(off, len);
		pages = ceph_alloc_page_vector(num_pages, GFP_NOFS);
		if (IS_ERR(pages))
			return PTR_ERR(pages);
		ret = striped_read(inode, off, len, pages,
					num_pages, checkeof, 0, 0);
		if (ret > 0) {
			int l, k = 0;
			size_t left = len = ret;

			while (left) {
				void __user *data = i->iov[0].iov_base
							+ i->iov_offset;
				l = min(i->iov[0].iov_len - i->iov_offset,
					left);

				ret = ceph_copy_page_vector_to_user(&pages[k],
								    data, off,
								    l);
				if (ret > 0) {
					iov_iter_advance(i, ret);
					left -= ret;
					off += ret;
					k = calc_pages_for(iocb->ki_pos,
							   len - left + 1) - 1;
					BUG_ON(k >= num_pages && left);
				} else
					break;
			}
		}
		ceph_release_page_vector(pages, num_pages);
	}
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	if (off > iocb->ki_pos) {
		ret = off - iocb->ki_pos;
		iocb->ki_pos = off;
	}
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	dout("sync_read result %d\n", ret);
	return ret;
}

/*
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 * Write commit request unsafe callback, called to tell us when a
 * request is unsafe (that is, in flight--has been handed to the
 * messenger to send to its target osd).  It is called again when
 * we've received a response message indicating the request is
 * "safe" (its CEPH_OSD_FLAG_ONDISK flag is set), or when a request
 * is completed early (and unsuccessfully) due to a timeout or
 * interrupt.
 *
 * This is used if we requested both an ACK and ONDISK commit reply
 * from the OSD.
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 */
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static void ceph_sync_write_unsafe(struct ceph_osd_request *req, bool unsafe)
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{
	struct ceph_inode_info *ci = ceph_inode(req->r_inode);

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	dout("%s %p tid %llu %ssafe\n", __func__, req, req->r_tid,
		unsafe ? "un" : "");
	if (unsafe) {
		ceph_get_cap_refs(ci, CEPH_CAP_FILE_WR);
		spin_lock(&ci->i_unsafe_lock);
		list_add_tail(&req->r_unsafe_item,
			      &ci->i_unsafe_writes);
		spin_unlock(&ci->i_unsafe_lock);
	} else {
		spin_lock(&ci->i_unsafe_lock);
		list_del_init(&req->r_unsafe_item);
		spin_unlock(&ci->i_unsafe_lock);
		ceph_put_cap_refs(ci, CEPH_CAP_FILE_WR);
	}
S
Sage Weil 已提交
531 532
}

533

S
Sage Weil 已提交
534
/*
535
 * Synchronous write, straight from __user pointer or user pages.
S
Sage Weil 已提交
536 537 538 539 540
 *
 * If write spans object boundary, just do multiple writes.  (For a
 * correct atomic write, we should e.g. take write locks on all
 * objects, rollback on failure, etc.)
 */
541 542 543
static ssize_t
ceph_sync_direct_write(struct kiocb *iocb, const struct iovec *iov,
		       unsigned long nr_segs, size_t count)
S
Sage Weil 已提交
544
{
545
	struct file *file = iocb->ki_filp;
A
Al Viro 已提交
546
	struct inode *inode = file_inode(file);
S
Sage Weil 已提交
547
	struct ceph_inode_info *ci = ceph_inode(inode);
548
	struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
549 550
	struct ceph_snap_context *snapc;
	struct ceph_vino vino;
S
Sage Weil 已提交
551 552 553 554 555 556
	struct ceph_osd_request *req;
	struct page **pages;
	int num_pages;
	int written = 0;
	int flags;
	int check_caps = 0;
557
	int page_align;
S
Sage Weil 已提交
558 559
	int ret;
	struct timespec mtime = CURRENT_TIME;
560 561
	loff_t pos = iocb->ki_pos;
	struct iov_iter i;
S
Sage Weil 已提交
562

A
Al Viro 已提交
563
	if (ceph_snap(file_inode(file)) != CEPH_NOSNAP)
S
Sage Weil 已提交
564 565
		return -EROFS;

566 567
	dout("sync_direct_write on file %p %lld~%u\n", file, pos,
	     (unsigned)count);
S
Sage Weil 已提交
568

569
	ret = filemap_write_and_wait_range(inode->i_mapping, pos, pos + count);
570 571 572 573 574
	if (ret < 0)
		return ret;

	ret = invalidate_inode_pages2_range(inode->i_mapping,
					    pos >> PAGE_CACHE_SHIFT,
575
					    (pos + count) >> PAGE_CACHE_SHIFT);
576 577 578
	if (ret < 0)
		dout("invalidate_inode_pages2_range returned %d\n", ret);

S
Sage Weil 已提交
579 580 581 582
	flags = CEPH_OSD_FLAG_ORDERSNAP |
		CEPH_OSD_FLAG_ONDISK |
		CEPH_OSD_FLAG_WRITE;

583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603
	iov_iter_init(&i, iov, nr_segs, count, 0);

	while (iov_iter_count(&i) > 0) {
		void __user *data = i.iov->iov_base + i.iov_offset;
		u64 len = i.iov->iov_len - i.iov_offset;

		page_align = (unsigned long)data & ~PAGE_MASK;

		snapc = ci->i_snap_realm->cached_context;
		vino = ceph_vino(inode);
		req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,
					    vino, pos, &len,
					    2,/*include a 'startsync' command*/
					    CEPH_OSD_OP_WRITE, flags, snapc,
					    ci->i_truncate_seq,
					    ci->i_truncate_size,
					    false);
		if (IS_ERR(req)) {
			ret = PTR_ERR(req);
			goto out;
		}
S
Sage Weil 已提交
604

605
		num_pages = calc_pages_for(page_align, len);
606
		pages = ceph_get_direct_page_vector(data, num_pages, false);
S
Sage Weil 已提交
607 608 609 610 611 612 613 614 615
		if (IS_ERR(pages)) {
			ret = PTR_ERR(pages);
			goto out;
		}

		/*
		 * throw out any page cache pages in this range. this
		 * may block.
		 */
S
Sage Weil 已提交
616
		truncate_inode_pages_range(inode->i_mapping, pos,
617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728
				   (pos+len) | (PAGE_CACHE_SIZE-1));
		osd_req_op_extent_osd_data_pages(req, 0, pages, len, page_align,
						false, false);

		/* BUG_ON(vino.snap != CEPH_NOSNAP); */
		ceph_osdc_build_request(req, pos, snapc, vino.snap, &mtime);

		ret = ceph_osdc_start_request(&fsc->client->osdc, req, false);
		if (!ret)
			ret = ceph_osdc_wait_request(&fsc->client->osdc, req);

		ceph_put_page_vector(pages, num_pages, false);

out:
		ceph_osdc_put_request(req);
		if (ret == 0) {
			pos += len;
			written += len;
			iov_iter_advance(&i, (size_t)len);

			if (pos > i_size_read(inode)) {
				check_caps = ceph_inode_set_size(inode, pos);
				if (check_caps)
					ceph_check_caps(ceph_inode(inode),
							CHECK_CAPS_AUTHONLY,
							NULL);
			}
		} else
			break;
	}

	if (ret != -EOLDSNAPC && written > 0) {
		iocb->ki_pos = pos;
		ret = written;
	}
	return ret;
}


/*
 * Synchronous write, straight from __user pointer or user pages.
 *
 * If write spans object boundary, just do multiple writes.  (For a
 * correct atomic write, we should e.g. take write locks on all
 * objects, rollback on failure, etc.)
 */
static ssize_t ceph_sync_write(struct kiocb *iocb, const struct iovec *iov,
			       unsigned long nr_segs, size_t count)
{
	struct file *file = iocb->ki_filp;
	struct inode *inode = file_inode(file);
	struct ceph_inode_info *ci = ceph_inode(inode);
	struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
	struct ceph_snap_context *snapc;
	struct ceph_vino vino;
	struct ceph_osd_request *req;
	struct page **pages;
	u64 len;
	int num_pages;
	int written = 0;
	int flags;
	int check_caps = 0;
	int ret;
	struct timespec mtime = CURRENT_TIME;
	loff_t pos = iocb->ki_pos;
	struct iov_iter i;

	if (ceph_snap(file_inode(file)) != CEPH_NOSNAP)
		return -EROFS;

	dout("sync_write on file %p %lld~%u\n", file, pos, (unsigned)count);

	ret = filemap_write_and_wait_range(inode->i_mapping, pos, pos + count);
	if (ret < 0)
		return ret;

	ret = invalidate_inode_pages2_range(inode->i_mapping,
					    pos >> PAGE_CACHE_SHIFT,
					    (pos + count) >> PAGE_CACHE_SHIFT);
	if (ret < 0)
		dout("invalidate_inode_pages2_range returned %d\n", ret);

	flags = CEPH_OSD_FLAG_ORDERSNAP |
		CEPH_OSD_FLAG_ONDISK |
		CEPH_OSD_FLAG_WRITE |
		CEPH_OSD_FLAG_ACK;

	iov_iter_init(&i, iov, nr_segs, count, 0);

	while ((len = iov_iter_count(&i)) > 0) {
		size_t left;
		int n;

		snapc = ci->i_snap_realm->cached_context;
		vino = ceph_vino(inode);
		req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,
					    vino, pos, &len, 1,
					    CEPH_OSD_OP_WRITE, flags, snapc,
					    ci->i_truncate_seq,
					    ci->i_truncate_size,
					    false);
		if (IS_ERR(req)) {
			ret = PTR_ERR(req);
			goto out;
		}

		/*
		 * write from beginning of first page,
		 * regardless of io alignment
		 */
		num_pages = (len + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;

729
		pages = ceph_alloc_page_vector(num_pages, GFP_NOFS);
S
Sage Weil 已提交
730 731 732 733
		if (IS_ERR(pages)) {
			ret = PTR_ERR(pages);
			goto out;
		}
734 735 736

		left = len;
		for (n = 0; n < num_pages; n++) {
737
			size_t plen = min_t(size_t, left, PAGE_SIZE);
738 739 740 741 742 743 744 745 746
			ret = iov_iter_copy_from_user(pages[n], &i, 0, plen);
			if (ret != plen) {
				ret = -EFAULT;
				break;
			}
			left -= ret;
			iov_iter_advance(&i, ret);
		}

S
Sage Weil 已提交
747 748 749 750 751
		if (ret < 0) {
			ceph_release_page_vector(pages, num_pages);
			goto out;
		}

752 753 754
		/* get a second commit callback */
		req->r_unsafe_callback = ceph_sync_write_unsafe;
		req->r_inode = inode;
S
Sage Weil 已提交
755

756 757
		osd_req_op_extent_osd_data_pages(req, 0, pages, len, 0,
						false, true);
758

759 760
		/* BUG_ON(vino.snap != CEPH_NOSNAP); */
		ceph_osdc_build_request(req, pos, snapc, vino.snap, &mtime);
S
Sage Weil 已提交
761

762 763 764
		ret = ceph_osdc_start_request(&fsc->client->osdc, req, false);
		if (!ret)
			ret = ceph_osdc_wait_request(&fsc->client->osdc, req);
S
Sage Weil 已提交
765 766

out:
767 768 769 770 771 772 773 774 775 776 777 778 779 780 781
		ceph_osdc_put_request(req);
		if (ret == 0) {
			pos += len;
			written += len;

			if (pos > i_size_read(inode)) {
				check_caps = ceph_inode_set_size(inode, pos);
				if (check_caps)
					ceph_check_caps(ceph_inode(inode),
							CHECK_CAPS_AUTHONLY,
							NULL);
			}
		} else
			break;
	}
S
Sage Weil 已提交
782

783
	if (ret != -EOLDSNAPC && written > 0) {
S
Sage Weil 已提交
784
		ret = written;
785
		iocb->ki_pos = pos;
S
Sage Weil 已提交
786 787 788 789 790 791 792 793 794 795 796 797 798 799 800
	}
	return ret;
}

/*
 * Wrap generic_file_aio_read with checks for cap bits on the inode.
 * Atomically grab references, so that those bits are not released
 * back to the MDS mid-read.
 *
 * Hmm, the sync read case isn't actually async... should it be?
 */
static ssize_t ceph_aio_read(struct kiocb *iocb, const struct iovec *iov,
			     unsigned long nr_segs, loff_t pos)
{
	struct file *filp = iocb->ki_filp;
801
	struct ceph_file_info *fi = filp->private_data;
802
	size_t len = iocb->ki_nbytes;
A
Al Viro 已提交
803
	struct inode *inode = file_inode(filp);
S
Sage Weil 已提交
804 805
	struct ceph_inode_info *ci = ceph_inode(inode);
	ssize_t ret;
806
	int want, got = 0;
807
	int checkeof = 0, read = 0;
S
Sage Weil 已提交
808

809
again:
810 811 812
	dout("aio_read %p %llx.%llx %llu~%u trying to get caps on %p\n",
	     inode, ceph_vinop(inode), iocb->ki_pos, (unsigned)len, inode);

813 814 815 816 817
	if (fi->fmode & CEPH_FILE_MODE_LAZY)
		want = CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO;
	else
		want = CEPH_CAP_FILE_CACHE;
	ret = ceph_get_caps(ci, CEPH_CAP_FILE_RD, want, &got, -1);
S
Sage Weil 已提交
818
	if (ret < 0)
819
		return ret;
S
Sage Weil 已提交
820

821
	if ((got & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) == 0 ||
S
Sage Weil 已提交
822
	    (iocb->ki_filp->f_flags & O_DIRECT) ||
823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838
	    (fi->flags & CEPH_F_SYNC)) {
		struct iov_iter i;

		dout("aio_sync_read %p %llx.%llx %llu~%u got cap refs on %s\n",
		     inode, ceph_vinop(inode), iocb->ki_pos, (unsigned)len,
		     ceph_cap_string(got));

		if (!read) {
			ret = generic_segment_checks(iov, &nr_segs,
							&len, VERIFY_WRITE);
			if (ret)
				goto out;
		}

		iov_iter_init(&i, iov, nr_segs, len, read);

S
Sage Weil 已提交
839
		/* hmm, this isn't really async... */
840 841 842 843 844 845 846 847 848 849 850 851 852 853
		ret = ceph_sync_read(iocb, &i, &checkeof);
	} else {
		/*
		 * We can't modify the content of iov,
		 * so we only read from beginning.
		 */
		if (read) {
			iocb->ki_pos = pos;
			len = iocb->ki_nbytes;
			read = 0;
		}
		dout("aio_read %p %llx.%llx %llu~%u got cap refs on %s\n",
		     inode, ceph_vinop(inode), pos, (unsigned)len,
		     ceph_cap_string(got));
S
Sage Weil 已提交
854

855 856
		ret = generic_file_aio_read(iocb, iov, nr_segs, pos);
	}
S
Sage Weil 已提交
857 858 859 860
out:
	dout("aio_read %p %llx.%llx dropping cap refs on %s = %d\n",
	     inode, ceph_vinop(inode), ceph_cap_string(got), (int)ret);
	ceph_put_cap_refs(ci, got);
861 862

	if (checkeof && ret >= 0) {
863 864
		int statret = ceph_do_getattr(inode,
					      CEPH_STAT_CAP_SIZE);
865 866

		/* hit EOF or hole? */
867 868 869 870 871 872
		if (statret == 0 && iocb->ki_pos < inode->i_size &&
			ret < len) {
			dout("sync_read hit hole, ppos %lld < size %lld"
			     ", reading more\n", iocb->ki_pos,
			     inode->i_size);

873 874 875 876 877 878
			read += ret;
			len -= ret;
			checkeof = 0;
			goto again;
		}
	}
879

880 881 882
	if (ret >= 0)
		ret += read;

S
Sage Weil 已提交
883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899
	return ret;
}

/*
 * Take cap references to avoid releasing caps to MDS mid-write.
 *
 * If we are synchronous, and write with an old snap context, the OSD
 * may return EOLDSNAPC.  In that case, retry the write.. _after_
 * dropping our cap refs and allowing the pending snap to logically
 * complete _before_ this write occurs.
 *
 * If we are near ENOSPC, write synchronously.
 */
static ssize_t ceph_aio_write(struct kiocb *iocb, const struct iovec *iov,
		       unsigned long nr_segs, loff_t pos)
{
	struct file *file = iocb->ki_filp;
900
	struct ceph_file_info *fi = file->private_data;
A
Al Viro 已提交
901
	struct inode *inode = file_inode(file);
S
Sage Weil 已提交
902
	struct ceph_inode_info *ci = ceph_inode(inode);
903 904
	struct ceph_osd_client *osdc =
		&ceph_sb_to_client(inode->i_sb)->client->osdc;
905 906
	ssize_t count, written = 0;
	int err, want, got;
S
Sage Weil 已提交
907 908 909 910

	if (ceph_snap(inode) != CEPH_NOSNAP)
		return -EROFS;

911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934
	mutex_lock(&inode->i_mutex);

	err = generic_segment_checks(iov, &nr_segs, &count, VERIFY_READ);
	if (err)
		goto out;

	/* We can write back this queue in page reclaim */
	current->backing_dev_info = file->f_mapping->backing_dev_info;

	err = generic_write_checks(file, &pos, &count, S_ISBLK(inode->i_mode));
	if (err)
		goto out;

	if (count == 0)
		goto out;

	err = file_remove_suid(file);
	if (err)
		goto out;

	err = file_update_time(file);
	if (err)
		goto out;

S
Sage Weil 已提交
935
retry_snap:
Y
Yan, Zheng 已提交
936
	if (ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_FULL)) {
937
		err = -ENOSPC;
Y
Yan, Zheng 已提交
938 939
		goto out;
	}
940

941
	dout("aio_write %p %llx.%llx %llu~%zd getting caps. i_size %llu\n",
942
	     inode, ceph_vinop(inode), pos, count, inode->i_size);
S
Sage Weil 已提交
943 944 945 946
	if (fi->fmode & CEPH_FILE_MODE_LAZY)
		want = CEPH_CAP_FILE_BUFFER | CEPH_CAP_FILE_LAZYIO;
	else
		want = CEPH_CAP_FILE_BUFFER;
947 948 949
	got = 0;
	err = ceph_get_caps(ci, CEPH_CAP_FILE_WR, want, &got, pos + count);
	if (err < 0)
950
		goto out;
S
Sage Weil 已提交
951

952
	dout("aio_write %p %llx.%llx %llu~%zd got cap refs on %s\n",
953
	     inode, ceph_vinop(inode), pos, count, ceph_cap_string(got));
S
Sage Weil 已提交
954 955

	if ((got & (CEPH_CAP_FILE_BUFFER|CEPH_CAP_FILE_LAZYIO)) == 0 ||
956
	    (file->f_flags & O_DIRECT) || (fi->flags & CEPH_F_SYNC)) {
957
		mutex_unlock(&inode->i_mutex);
958 959 960 961 962
		if (file->f_flags & O_DIRECT)
			written = ceph_sync_direct_write(iocb, iov,
							 nr_segs, count);
		else
			written = ceph_sync_write(iocb, iov, nr_segs, count);
963 964 965 966 967 968 969 970
		if (written == -EOLDSNAPC) {
			dout("aio_write %p %llx.%llx %llu~%u"
				"got EOLDSNAPC, retrying\n",
				inode, ceph_vinop(inode),
				pos, (unsigned)iov->iov_len);
			mutex_lock(&inode->i_mutex);
			goto retry_snap;
		}
S
Sage Weil 已提交
971
	} else {
Y
Yan, Zheng 已提交
972 973 974 975 976 977 978
		/*
		 * No need to acquire the i_truncate_mutex. Because
		 * the MDS revokes Fwb caps before sending truncate
		 * message to us. We can't get Fwb cap while there
		 * are pending vmtruncate. So write and vmtruncate
		 * can not run at the same time
		 */
979 980 981
		written = generic_file_buffered_write(iocb, iov, nr_segs,
						      pos, &iocb->ki_pos,
						      count, 0);
Y
Yan, Zheng 已提交
982
		mutex_unlock(&inode->i_mutex);
S
Sage Weil 已提交
983
	}
984

985
	if (written >= 0) {
986
		int dirty;
987
		spin_lock(&ci->i_ceph_lock);
988
		dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR);
989
		spin_unlock(&ci->i_ceph_lock);
990 991
		if (dirty)
			__mark_inode_dirty(inode, dirty);
S
Sage Weil 已提交
992
	}
S
Sage Weil 已提交
993

S
Sage Weil 已提交
994
	dout("aio_write %p %llx.%llx %llu~%u  dropping cap refs on %s\n",
S
Sage Weil 已提交
995 996
	     inode, ceph_vinop(inode), pos, (unsigned)iov->iov_len,
	     ceph_cap_string(got));
S
Sage Weil 已提交
997
	ceph_put_cap_refs(ci, got);
S
Sage Weil 已提交
998

999
	if (written >= 0 &&
Y
Yan, Zheng 已提交
1000 1001
	    ((file->f_flags & O_SYNC) || IS_SYNC(file->f_mapping->host) ||
	     ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_NEARFULL))) {
1002
		err = vfs_fsync_range(file, pos, pos + written - 1, 1);
Y
Yan, Zheng 已提交
1003
		if (err < 0)
1004
			written = err;
Y
Yan, Zheng 已提交
1005
	}
1006

1007 1008
	goto out_unlocked;

1009
out:
1010 1011
	mutex_unlock(&inode->i_mutex);
out_unlocked:
1012 1013
	current->backing_dev_info = NULL;
	return written ? written : err;
S
Sage Weil 已提交
1014 1015 1016 1017 1018
}

/*
 * llseek.  be sure to verify file size on SEEK_END.
 */
1019
static loff_t ceph_llseek(struct file *file, loff_t offset, int whence)
S
Sage Weil 已提交
1020 1021 1022 1023 1024
{
	struct inode *inode = file->f_mapping->host;
	int ret;

	mutex_lock(&inode->i_mutex);
1025

1026
	if (whence == SEEK_END || whence == SEEK_DATA || whence == SEEK_HOLE) {
S
Sage Weil 已提交
1027 1028 1029 1030 1031
		ret = ceph_do_getattr(inode, CEPH_STAT_CAP_SIZE);
		if (ret < 0) {
			offset = ret;
			goto out;
		}
1032 1033
	}

1034
	switch (whence) {
1035
	case SEEK_END:
S
Sage Weil 已提交
1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050
		offset += inode->i_size;
		break;
	case SEEK_CUR:
		/*
		 * Here we special-case the lseek(fd, 0, SEEK_CUR)
		 * position-querying operation.  Avoid rewriting the "same"
		 * f_pos value back to the file because a concurrent read(),
		 * write() or lseek() might have altered it
		 */
		if (offset == 0) {
			offset = file->f_pos;
			goto out;
		}
		offset += file->f_pos;
		break;
1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063
	case SEEK_DATA:
		if (offset >= inode->i_size) {
			ret = -ENXIO;
			goto out;
		}
		break;
	case SEEK_HOLE:
		if (offset >= inode->i_size) {
			ret = -ENXIO;
			goto out;
		}
		offset = inode->i_size;
		break;
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	}

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	offset = vfs_setpos(file, offset, inode->i_sb->s_maxbytes);
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out:
	mutex_unlock(&inode->i_mutex);
	return offset;
}

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static inline void ceph_zero_partial_page(
	struct inode *inode, loff_t offset, unsigned size)
{
	struct page *page;
	pgoff_t index = offset >> PAGE_CACHE_SHIFT;

	page = find_lock_page(inode->i_mapping, index);
	if (page) {
		wait_on_page_writeback(page);
		zero_user(page, offset & (PAGE_CACHE_SIZE - 1), size);
		unlock_page(page);
		page_cache_release(page);
	}
}

static void ceph_zero_pagecache_range(struct inode *inode, loff_t offset,
				      loff_t length)
{
	loff_t nearly = round_up(offset, PAGE_CACHE_SIZE);
	if (offset < nearly) {
		loff_t size = nearly - offset;
		if (length < size)
			size = length;
		ceph_zero_partial_page(inode, offset, size);
		offset += size;
		length -= size;
	}
	if (length >= PAGE_CACHE_SIZE) {
		loff_t size = round_down(length, PAGE_CACHE_SIZE);
		truncate_pagecache_range(inode, offset, offset + size - 1);
		offset += size;
		length -= size;
	}
	if (length)
		ceph_zero_partial_page(inode, offset, length);
}

static int ceph_zero_partial_object(struct inode *inode,
				    loff_t offset, loff_t *length)
{
	struct ceph_inode_info *ci = ceph_inode(inode);
	struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
	struct ceph_osd_request *req;
	int ret = 0;
	loff_t zero = 0;
	int op;

	if (!length) {
		op = offset ? CEPH_OSD_OP_DELETE : CEPH_OSD_OP_TRUNCATE;
		length = &zero;
	} else {
		op = CEPH_OSD_OP_ZERO;
	}

	req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,
					ceph_vino(inode),
					offset, length,
					1, op,
					CEPH_OSD_FLAG_WRITE |
					CEPH_OSD_FLAG_ONDISK,
					NULL, 0, 0, false);
	if (IS_ERR(req)) {
		ret = PTR_ERR(req);
		goto out;
	}

	ceph_osdc_build_request(req, offset, NULL, ceph_vino(inode).snap,
				&inode->i_mtime);

	ret = ceph_osdc_start_request(&fsc->client->osdc, req, false);
	if (!ret) {
		ret = ceph_osdc_wait_request(&fsc->client->osdc, req);
		if (ret == -ENOENT)
			ret = 0;
	}
	ceph_osdc_put_request(req);

out:
	return ret;
}

static int ceph_zero_objects(struct inode *inode, loff_t offset, loff_t length)
{
	int ret = 0;
	struct ceph_inode_info *ci = ceph_inode(inode);
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	s32 stripe_unit = ceph_file_layout_su(ci->i_layout);
	s32 stripe_count = ceph_file_layout_stripe_count(ci->i_layout);
	s32 object_size = ceph_file_layout_object_size(ci->i_layout);
	u64 object_set_size = object_size * stripe_count;
	u64 nearly, t;

	/* round offset up to next period boundary */
	nearly = offset + object_set_size - 1;
	t = nearly;
	nearly -= do_div(t, object_set_size);
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	while (length && offset < nearly) {
		loff_t size = length;
		ret = ceph_zero_partial_object(inode, offset, &size);
		if (ret < 0)
			return ret;
		offset += size;
		length -= size;
	}
	while (length >= object_set_size) {
		int i;
		loff_t pos = offset;
		for (i = 0; i < stripe_count; ++i) {
			ret = ceph_zero_partial_object(inode, pos, NULL);
			if (ret < 0)
				return ret;
			pos += stripe_unit;
		}
		offset += object_set_size;
		length -= object_set_size;
	}
	while (length) {
		loff_t size = length;
		ret = ceph_zero_partial_object(inode, offset, &size);
		if (ret < 0)
			return ret;
		offset += size;
		length -= size;
	}
	return ret;
}

static long ceph_fallocate(struct file *file, int mode,
				loff_t offset, loff_t length)
{
	struct ceph_file_info *fi = file->private_data;
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Libo Chen 已提交
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	struct inode *inode = file_inode(file);
L
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	struct ceph_inode_info *ci = ceph_inode(inode);
	struct ceph_osd_client *osdc =
		&ceph_inode_to_client(inode)->client->osdc;
	int want, got = 0;
	int dirty;
	int ret = 0;
	loff_t endoff = 0;
	loff_t size;

	if (!S_ISREG(inode->i_mode))
		return -EOPNOTSUPP;

	if (IS_SWAPFILE(inode))
		return -ETXTBSY;

	mutex_lock(&inode->i_mutex);

	if (ceph_snap(inode) != CEPH_NOSNAP) {
		ret = -EROFS;
		goto unlock;
	}

	if (ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_FULL) &&
		!(mode & FALLOC_FL_PUNCH_HOLE)) {
		ret = -ENOSPC;
		goto unlock;
	}

	size = i_size_read(inode);
	if (!(mode & FALLOC_FL_KEEP_SIZE))
		endoff = offset + length;

	if (fi->fmode & CEPH_FILE_MODE_LAZY)
		want = CEPH_CAP_FILE_BUFFER | CEPH_CAP_FILE_LAZYIO;
	else
		want = CEPH_CAP_FILE_BUFFER;

	ret = ceph_get_caps(ci, CEPH_CAP_FILE_WR, want, &got, endoff);
	if (ret < 0)
		goto unlock;

	if (mode & FALLOC_FL_PUNCH_HOLE) {
		if (offset < size)
			ceph_zero_pagecache_range(inode, offset, length);
		ret = ceph_zero_objects(inode, offset, length);
	} else if (endoff > size) {
		truncate_pagecache_range(inode, size, -1);
		if (ceph_inode_set_size(inode, endoff))
			ceph_check_caps(ceph_inode(inode),
				CHECK_CAPS_AUTHONLY, NULL);
	}

	if (!ret) {
		spin_lock(&ci->i_ceph_lock);
		dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR);
		spin_unlock(&ci->i_ceph_lock);
		if (dirty)
			__mark_inode_dirty(inode, dirty);
	}

	ceph_put_cap_refs(ci, got);
unlock:
	mutex_unlock(&inode->i_mutex);
	return ret;
}

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const struct file_operations ceph_file_fops = {
	.open = ceph_open,
	.release = ceph_release,
	.llseek = ceph_llseek,
	.read = do_sync_read,
	.write = do_sync_write,
	.aio_read = ceph_aio_read,
	.aio_write = ceph_aio_write,
	.mmap = ceph_mmap,
	.fsync = ceph_fsync,
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Greg Farnum 已提交
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	.lock = ceph_lock,
	.flock = ceph_flock,
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1283 1284 1285 1286
	.splice_read = generic_file_splice_read,
	.splice_write = generic_file_splice_write,
	.unlocked_ioctl = ceph_ioctl,
	.compat_ioctl	= ceph_ioctl,
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Li Wang 已提交
1287
	.fallocate	= ceph_fallocate,
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};