gfs2: Implement SEEK_HOLE / SEEK_DATA via iomap
So far, lseek on gfs2 did not report holes. Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com> Signed-off-by: Bob Peterson <rpeterso@redhat.com>
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aac1a55b45
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3a27411cb4
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@ -60,9 +60,7 @@ static loff_t gfs2_llseek(struct file *file, loff_t offset, int whence)
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loff_t error;
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switch (whence) {
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case SEEK_END: /* These reference inode->i_size */
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case SEEK_DATA:
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case SEEK_HOLE:
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case SEEK_END:
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error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY,
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&i_gh);
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if (!error) {
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@ -70,8 +68,21 @@ static loff_t gfs2_llseek(struct file *file, loff_t offset, int whence)
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gfs2_glock_dq_uninit(&i_gh);
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}
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break;
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case SEEK_DATA:
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error = gfs2_seek_data(file, offset);
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break;
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case SEEK_HOLE:
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error = gfs2_seek_hole(file, offset);
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break;
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case SEEK_CUR:
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case SEEK_SET:
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/*
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* These don't reference inode->i_size and don't depend on the
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* block mapping, so we don't need the glock.
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*/
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error = generic_file_llseek(file, offset, whence);
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break;
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default:
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@ -2029,6 +2029,44 @@ out:
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return ret;
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}
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loff_t gfs2_seek_data(struct file *file, loff_t offset)
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{
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struct inode *inode = file->f_mapping->host;
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struct gfs2_inode *ip = GFS2_I(inode);
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struct gfs2_holder gh;
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loff_t ret;
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inode_lock_shared(inode);
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ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
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if (!ret)
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ret = iomap_seek_data(inode, offset, &gfs2_iomap_ops);
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gfs2_glock_dq_uninit(&gh);
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inode_unlock_shared(inode);
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if (ret < 0)
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return ret;
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return vfs_setpos(file, ret, inode->i_sb->s_maxbytes);
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}
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loff_t gfs2_seek_hole(struct file *file, loff_t offset)
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{
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struct inode *inode = file->f_mapping->host;
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struct gfs2_inode *ip = GFS2_I(inode);
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struct gfs2_holder gh;
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loff_t ret;
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inode_lock_shared(inode);
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ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
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if (!ret)
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ret = iomap_seek_hole(inode, offset, &gfs2_iomap_ops);
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gfs2_glock_dq_uninit(&gh);
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inode_unlock_shared(inode);
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if (ret < 0)
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return ret;
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return vfs_setpos(file, ret, inode->i_sb->s_maxbytes);
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}
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const struct inode_operations gfs2_file_iops = {
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.permission = gfs2_permission,
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.setattr = gfs2_setattr,
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@ -109,6 +109,8 @@ extern int gfs2_setattr_simple(struct inode *inode, struct iattr *attr);
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extern struct inode *gfs2_lookup_simple(struct inode *dip, const char *name);
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extern void gfs2_dinode_out(const struct gfs2_inode *ip, void *buf);
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extern int gfs2_open_common(struct inode *inode, struct file *file);
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extern loff_t gfs2_seek_data(struct file *file, loff_t offset);
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extern loff_t gfs2_seek_hole(struct file *file, loff_t offset);
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extern const struct inode_operations gfs2_file_iops;
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extern const struct inode_operations gfs2_dir_iops;
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