fs: handle SEEK_HOLE/SEEK_DATA properly in all fs's that define their own llseek
This converts everybody to handle SEEK_HOLE/SEEK_DATA properly. In some cases we just return -EINVAL, in others we do the normal generic thing, and in others we're simply making sure that the properly due-dilligence is done. For example in NFS/CIFS we need to make sure the file size is update properly for the SEEK_HOLE and SEEK_DATA case, but since it calls the generic llseek stuff itself that is all we have to do. Thanks, Signed-off-by: Josef Bacik <josef@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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Родитель
c334b1138b
Коммит
06222e491e
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@ -355,20 +355,25 @@ static loff_t block_llseek(struct file *file, loff_t offset, int origin)
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mutex_lock(&bd_inode->i_mutex);
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size = i_size_read(bd_inode);
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retval = -EINVAL;
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switch (origin) {
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case 2:
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case SEEK_END:
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offset += size;
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break;
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case 1:
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case SEEK_CUR:
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offset += file->f_pos;
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case SEEK_SET:
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break;
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default:
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goto out;
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}
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retval = -EINVAL;
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if (offset >= 0 && offset <= size) {
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if (offset != file->f_pos) {
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file->f_pos = offset;
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}
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retval = offset;
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}
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out:
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mutex_unlock(&bd_inode->i_mutex);
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return retval;
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}
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@ -446,14 +446,19 @@ static loff_t ceph_dir_llseek(struct file *file, loff_t offset, int origin)
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loff_t retval;
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mutex_lock(&inode->i_mutex);
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retval = -EINVAL;
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switch (origin) {
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case SEEK_END:
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offset += inode->i_size + 2; /* FIXME */
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break;
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case SEEK_CUR:
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offset += file->f_pos;
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case SEEK_SET:
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break;
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default:
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goto out;
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}
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retval = -EINVAL;
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if (offset >= 0 && offset <= inode->i_sb->s_maxbytes) {
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if (offset != file->f_pos) {
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file->f_pos = offset;
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@ -477,6 +482,7 @@ static loff_t ceph_dir_llseek(struct file *file, loff_t offset, int origin)
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if (offset > old_offset)
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fi->dir_release_count--;
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}
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out:
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mutex_unlock(&inode->i_mutex);
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return retval;
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}
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@ -768,13 +768,16 @@ static loff_t ceph_llseek(struct file *file, loff_t offset, int origin)
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mutex_lock(&inode->i_mutex);
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__ceph_do_pending_vmtruncate(inode);
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switch (origin) {
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case SEEK_END:
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if (origin != SEEK_CUR || origin != SEEK_SET) {
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ret = ceph_do_getattr(inode, CEPH_STAT_CAP_SIZE);
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if (ret < 0) {
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offset = ret;
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goto out;
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}
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}
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switch (origin) {
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case SEEK_END:
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offset += inode->i_size;
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break;
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case SEEK_CUR:
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@ -790,6 +793,19 @@ static loff_t ceph_llseek(struct file *file, loff_t offset, int origin)
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}
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offset += file->f_pos;
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break;
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case SEEK_DATA:
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if (offset >= inode->i_size) {
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ret = -ENXIO;
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goto out;
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}
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break;
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case SEEK_HOLE:
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if (offset >= inode->i_size) {
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ret = -ENXIO;
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goto out;
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}
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offset = inode->i_size;
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break;
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}
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if (offset < 0 || offset > inode->i_sb->s_maxbytes) {
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@ -704,8 +704,11 @@ static ssize_t cifs_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
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static loff_t cifs_llseek(struct file *file, loff_t offset, int origin)
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{
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/* origin == SEEK_END => we must revalidate the cached file length */
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if (origin == SEEK_END) {
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/*
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* origin == SEEK_END || SEEK_DATA || SEEK_HOLE => we must revalidate
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* the cached file length
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*/
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if (origin != SEEK_SET || origin != SEEK_CUR) {
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int rc;
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struct inode *inode = file->f_path.dentry->d_inode;
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@ -1600,15 +1600,32 @@ static loff_t fuse_file_llseek(struct file *file, loff_t offset, int origin)
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struct inode *inode = file->f_path.dentry->d_inode;
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mutex_lock(&inode->i_mutex);
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switch (origin) {
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case SEEK_END:
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if (origin != SEEK_CUR || origin != SEEK_SET) {
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retval = fuse_update_attributes(inode, NULL, file, NULL);
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if (retval)
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goto exit;
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}
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switch (origin) {
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case SEEK_END:
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offset += i_size_read(inode);
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break;
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case SEEK_CUR:
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offset += file->f_pos;
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break;
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case SEEK_DATA:
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if (offset >= i_size_read(inode)) {
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retval = -ENXIO;
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goto exit;
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}
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break;
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case SEEK_HOLE:
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if (offset >= i_size_read(inode)) {
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retval = -ENXIO;
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goto exit;
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}
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offset = i_size_read(inode);
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break;
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}
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retval = -EINVAL;
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if (offset >= 0 && offset <= inode->i_sb->s_maxbytes) {
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@ -29,6 +29,10 @@ static loff_t hpfs_dir_lseek(struct file *filp, loff_t off, int whence)
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struct hpfs_inode_info *hpfs_inode = hpfs_i(i);
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struct super_block *s = i->i_sb;
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/* Somebody else will have to figure out what to do here */
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if (whence == SEEK_DATA || whence == SEEK_HOLE)
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return -EINVAL;
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hpfs_lock(s);
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/*printk("dir lseek\n");*/
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@ -187,8 +187,11 @@ static loff_t nfs_file_llseek(struct file *filp, loff_t offset, int origin)
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filp->f_path.dentry->d_name.name,
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offset, origin);
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/* origin == SEEK_END => we must revalidate the cached file length */
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if (origin == SEEK_END) {
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/*
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* origin == SEEK_END || SEEK_DATA || SEEK_HOLE => we must revalidate
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* the cached file length
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*/
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if (origin != SEEK_SET || origin != SEEK_CUR) {
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struct inode *inode = filp->f_mapping->host;
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int retval = nfs_revalidate_file_size(inode, filp);
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