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907f4554e2
Currently various places in the VFS call vfs_dq_init directly. This means we tie the quota code into the VFS. Get rid of that and make the filesystem responsible for the initialization. For most metadata operations this is a straight forward move into the methods, but for truncate and open it's a bit more complicated. For truncate we currently only call vfs_dq_init for the sys_truncate case because open already takes care of it for ftruncate and open(O_TRUNC) - the new code causes an additional vfs_dq_init for those which is harmless. For open the initialization is moved from do_filp_open into the open method, which means it happens slightly earlier now, and only for regular files. The latter is fine because we don't need to initialize it for operations on special files, and we already do it as part of the namespace operations for directories. Add a dquot_file_open helper that filesystems that support generic quotas can use to fill in ->open. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jan Kara <jack@suse.cz>
165 lines
4.4 KiB
C
165 lines
4.4 KiB
C
/*
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* linux/fs/ext4/file.c
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*
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* Copyright (C) 1992, 1993, 1994, 1995
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* Remy Card (card@masi.ibp.fr)
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* Laboratoire MASI - Institut Blaise Pascal
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* Universite Pierre et Marie Curie (Paris VI)
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*
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* from
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*
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* linux/fs/minix/file.c
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*
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* Copyright (C) 1991, 1992 Linus Torvalds
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*
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* ext4 fs regular file handling primitives
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*
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* 64-bit file support on 64-bit platforms by Jakub Jelinek
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* (jj@sunsite.ms.mff.cuni.cz)
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*/
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#include <linux/time.h>
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#include <linux/fs.h>
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#include <linux/jbd2.h>
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#include <linux/mount.h>
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#include <linux/path.h>
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#include "ext4.h"
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#include "ext4_jbd2.h"
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#include "xattr.h"
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#include "acl.h"
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/*
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* Called when an inode is released. Note that this is different
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* from ext4_file_open: open gets called at every open, but release
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* gets called only when /all/ the files are closed.
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*/
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static int ext4_release_file(struct inode *inode, struct file *filp)
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{
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if (EXT4_I(inode)->i_state & EXT4_STATE_DA_ALLOC_CLOSE) {
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ext4_alloc_da_blocks(inode);
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EXT4_I(inode)->i_state &= ~EXT4_STATE_DA_ALLOC_CLOSE;
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}
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/* if we are the last writer on the inode, drop the block reservation */
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if ((filp->f_mode & FMODE_WRITE) &&
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(atomic_read(&inode->i_writecount) == 1) &&
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!EXT4_I(inode)->i_reserved_data_blocks)
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{
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down_write(&EXT4_I(inode)->i_data_sem);
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ext4_discard_preallocations(inode);
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up_write(&EXT4_I(inode)->i_data_sem);
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}
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if (is_dx(inode) && filp->private_data)
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ext4_htree_free_dir_info(filp->private_data);
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return 0;
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}
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static ssize_t
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ext4_file_write(struct kiocb *iocb, const struct iovec *iov,
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unsigned long nr_segs, loff_t pos)
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{
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struct inode *inode = iocb->ki_filp->f_path.dentry->d_inode;
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/*
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* If we have encountered a bitmap-format file, the size limit
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* is smaller than s_maxbytes, which is for extent-mapped files.
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*/
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if (!(EXT4_I(inode)->i_flags & EXT4_EXTENTS_FL)) {
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struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
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size_t length = iov_length(iov, nr_segs);
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if (pos > sbi->s_bitmap_maxbytes)
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return -EFBIG;
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if (pos + length > sbi->s_bitmap_maxbytes) {
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nr_segs = iov_shorten((struct iovec *)iov, nr_segs,
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sbi->s_bitmap_maxbytes - pos);
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}
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}
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return generic_file_aio_write(iocb, iov, nr_segs, pos);
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}
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static const struct vm_operations_struct ext4_file_vm_ops = {
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.fault = filemap_fault,
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.page_mkwrite = ext4_page_mkwrite,
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};
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static int ext4_file_mmap(struct file *file, struct vm_area_struct *vma)
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{
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struct address_space *mapping = file->f_mapping;
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if (!mapping->a_ops->readpage)
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return -ENOEXEC;
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file_accessed(file);
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vma->vm_ops = &ext4_file_vm_ops;
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vma->vm_flags |= VM_CAN_NONLINEAR;
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return 0;
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}
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static int ext4_file_open(struct inode * inode, struct file * filp)
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{
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struct super_block *sb = inode->i_sb;
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struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
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struct vfsmount *mnt = filp->f_path.mnt;
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struct path path;
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char buf[64], *cp;
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if (unlikely(!(sbi->s_mount_flags & EXT4_MF_MNTDIR_SAMPLED) &&
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!(sb->s_flags & MS_RDONLY))) {
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sbi->s_mount_flags |= EXT4_MF_MNTDIR_SAMPLED;
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/*
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* Sample where the filesystem has been mounted and
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* store it in the superblock for sysadmin convenience
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* when trying to sort through large numbers of block
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* devices or filesystem images.
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*/
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memset(buf, 0, sizeof(buf));
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path.mnt = mnt->mnt_parent;
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path.dentry = mnt->mnt_mountpoint;
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path_get(&path);
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cp = d_path(&path, buf, sizeof(buf));
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path_put(&path);
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if (!IS_ERR(cp)) {
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memcpy(sbi->s_es->s_last_mounted, cp,
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sizeof(sbi->s_es->s_last_mounted));
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sb->s_dirt = 1;
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}
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}
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return dquot_file_open(inode, filp);
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}
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const struct file_operations ext4_file_operations = {
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.llseek = generic_file_llseek,
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.read = do_sync_read,
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.write = do_sync_write,
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.aio_read = generic_file_aio_read,
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.aio_write = ext4_file_write,
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.unlocked_ioctl = ext4_ioctl,
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#ifdef CONFIG_COMPAT
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.compat_ioctl = ext4_compat_ioctl,
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#endif
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.mmap = ext4_file_mmap,
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.open = ext4_file_open,
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.release = ext4_release_file,
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.fsync = ext4_sync_file,
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.splice_read = generic_file_splice_read,
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.splice_write = generic_file_splice_write,
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};
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const struct inode_operations ext4_file_inode_operations = {
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.truncate = ext4_truncate,
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.setattr = ext4_setattr,
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.getattr = ext4_getattr,
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#ifdef CONFIG_EXT4_FS_XATTR
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.setxattr = generic_setxattr,
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.getxattr = generic_getxattr,
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.listxattr = ext4_listxattr,
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.removexattr = generic_removexattr,
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#endif
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.check_acl = ext4_check_acl,
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.fallocate = ext4_fallocate,
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.fiemap = ext4_fiemap,
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};
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